Battery device and electric appliance

Abstract

The application relates to a battery device and an electric device. The battery device comprises a box body, a plurality of battery monomers, a first battery monomer and a second battery monomer each having a pressure relief part, an exhaust structure corresponding to the pressure relief part, the exhaust structure comprising a first cavity and a second cavity, the first cavity being located between the second cavity and the battery monomer, the exhaust structure further comprising a first communicable part and a second communicable part, the first communicable part being used for connecting the pressure relief part of the first battery monomer with the first cavity, the second communicable part being used for connecting the pressure relief part of the second battery monomer with the second cavity, a channel structure, one end of the channel structure corresponding to the pressure relief part of the second battery monomer, the other end of the channel structure being connected with the second communicable part, the channel structure further comprising a channel wall forming a channel, at least part of the channel wall being located in the first cavity. In this way, the negative influence of the high-temperature smoke spouted by the first battery monomer and the second battery monomer on each other is reduced, and the risk of thermal runaway chain reaction in the box body is reduced.

Description

Technical Field

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

[0002] A battery device typically consists of multiple battery cells and a housing that contains them. After a battery cell experiences thermal runaway, the gases within it must be vented to the outside to prevent the cell from exploding. In existing battery devices, the thermally runaway cell usually vents its high-temperature gases into the housing first. These vented gases can easily affect other battery cells, causing them to experience thermal runaway as well, creating a chain reaction that leads to the entire battery device catching fire and exploding. Summary of the Invention

[0003] In view of the above problems, this application provides a battery device and electrical equipment that can alleviate the problem that the high-temperature flue gas emitted by a thermally runaway battery cell can easily trigger thermal runaway in other battery cells and cause a chain reaction.

[0004] In a first aspect, this application provides a battery device, comprising:

[0005] The box-shaped enclosure has a receiving cavity;

[0006] Multiple battery cells are disposed in a receiving cavity. Each battery cell has a pressure relief section. The multiple battery cells include a first battery cell and a second battery cell.

[0007] The exhaust structure is located on the same side of the first battery cell and the second battery cell along the first direction. The exhaust structure is correspondingly arranged with the pressure relief part. The exhaust structure includes a first cavity and a second cavity, with the first cavity located between the second cavity and the battery cell.

[0008] The exhaust structure also includes a first connectable part and a second connectable part. The first connectable part is located between the pressure relief part of the first battery cell and the first cavity, and is used to connect the pressure relief part of the first battery cell and the first cavity. The second connectable part is located between the pressure relief part of the second battery cell and the second cavity, and is used to connect the pressure relief part of the second battery cell and the second cavity.

[0009] The channel structure has one end corresponding to the pressure relief section of the second battery cell, and the other end of the channel structure is connected to the second connectable section. The channel structure also includes a channel wall forming the channel, and at least a portion of the channel wall is located in the first cavity.

[0010] In the aforementioned battery device, when the first battery cell experiences thermal runaway and emits high-temperature fumes from the pressure relief section, the fumes can be released into the first cavity through the first connectable section. When the second battery cell experiences thermal runaway and emits high-temperature fumes from the pressure relief section, the fumes can be released into the second cavity through the second connectable section. Since the high-temperature fumes emitted from the second battery cell enter the second cavity through a channel structure at least partially located within the first cavity, the high-temperature fumes emitted from the second battery cell are blocked by the inner wall of the channel structure during their entry into the second cavity. This reduces or blocks the impact of the high-temperature gas on the first battery cell via the first cavity and the first connectable section. Conversely, after entering the first cavity, the high-temperature fumes emitted from the first battery cell are blocked by the outer wall of the channel structure, which also reduces or blocks the impact of the high-temperature gas on the second battery cell via the first cavity and the second connectable section.

[0011] Therefore, the overall negative impact of the high-temperature flue gas emitted by the first and second battery cells on each other is reduced, the risk of thermal runaway chain reaction in the box is reduced, and the reliability of the battery device is improved.

[0012] In some embodiments, the first battery cell and the second battery cell are any two adjacent battery cells among a plurality of battery cells.

[0013] When the first battery cell is adjacent to the second battery cell, the negative impact of the high-temperature flue gas emitted by the adjacent first and second battery cells on each other is reduced, the risk of thermal runaway chain reaction in the box is reduced, and the reliability of the battery device is improved.

[0014] In some embodiments, the inner wall of the first cavity includes a first top wall and a first bottom wall, and the inner wall of the second cavity includes a second top wall and a second bottom wall;

[0015] The first top wall is provided with a first connectable part and a third connectable part that are spaced apart, and the third connectable part is provided in correspondence with the pressure relief part of the second battery cell.

[0016] The second top wall is provided with a second connectable portion, one end of the channel structure is sealed to the second connectable portion; and / or the other end of the channel structure is sealed to the third connectable portion.

[0017] When the pressure relief section of the second battery cell emits high-temperature flue gas, it can enter the second cavity through the third connectable part on the first top wall of the first cavity and the channel structure. Since one end of the channel structure is sealed to the second connectable part, the high-temperature flue gas entering the channel structure through the third connectable part can directly enter the second cavity under the guidance of the channel structure. In this way, on the one hand, the installation position of the channel structure is reliable and the guiding effect of the high-temperature flue gas is reliable. On the other hand, the method of setting the third connectable part on the first cavity is simpler. Since the channel wall of the channel structure is also at least partially located in the first cavity, the third connectable part is located on the first cavity, making it closer to the channel structure, which is more conducive to guiding the high-temperature flue gas into the channel structure and further into the second cavity for release.

[0018] When the pressure relief section of the second battery cell emits high-temperature flue gas, it can enter the second cavity through the third connectable part on the first top wall of the first cavity and the channel structure. Since the other end of the channel structure is sealed to the third connectable part, the high-temperature gas can directly enter the channel structure through the third connectable part and further enter the second cavity under the guidance of the channel structure. In this way, on the one hand, the installation position of the channel structure is reliable and the guiding effect of the high-temperature flue gas is reliable. On the other hand, the method of setting the third connectable part on the first cavity is simpler. Since the channel wall of the channel structure is also at least partially located in the first cavity, the third connectable part is located on the first cavity, making it closer to the channel structure, which is more conducive to guiding the high-temperature flue gas into the channel structure and further into the second cavity for release.

[0019] When the pressure relief section of the second battery cell emits high-temperature flue gas, it can enter the second cavity through the third connectable part on the first top wall of the first cavity, directly through the channel structure, and the second connectable part. The high-temperature flue gas is isolated from the first cavity through the channel structure, thereby preventing the high-temperature flue gas emitted by the second battery cell from entering the first cavity and affecting the first battery cell.

[0020] In some embodiments, one end of the channel structure is sealed to the second connectable portion; the other end of the channel structure is spaced apart from the third connectable portion, and the shortest distance between the channel structure and the third connectable portion is less than 1 / 2 of the height of the first cavity;

[0021] Alternatively, the other end of the channel structure is sealed to the third connectable part; one end of the channel structure is spaced apart from the second connectable part, and the shortest distance between the channel structure and the second connectable part is less than 1 / 2 of the height of the first cavity.

[0022] When the pressure relief section of the second battery cell emits high-temperature flue gas, a portion can enter the first cavity through the gap created between the third connectable section and the channel structure, while the other portion enters the second cavity under the guidance of the channel structure. This diverts the high-temperature flue gas emitted from the pressure relief section of the second battery cell, reducing the energy required for the high-temperature gas to directly enter the second cavity and further improving the reliability of the battery device under thermal runaway. Furthermore, when the shortest distance between the channel structure and the second connectable section is less than half the height of the first cavity, the blocking and isolation effect of the channel structure within the first cavity allows a large amount of high-temperature flue gas emitted from the pressure relief section of the second battery cell to enter the second cavity under the guidance of the channel structure, while only a small amount of high-temperature flue gas can enter the first cavity. This diversion dissipates the energy of the high-temperature flue gas entering the second cavity, and the small amount of high-temperature flue gas is insufficient to affect the first battery cell connected to the first cavity, further reducing the risk of a thermal runaway chain reaction.

[0023] When the pressure relief section of the second battery cell emits high-temperature flue gas, a portion can enter the first cavity through the gap created between the second connectable section and the channel structure, while the other portion enters the second cavity under the guidance of the channel structure. This diverts the high-temperature flue gas emitted from the pressure relief section of the second battery cell, reducing the energy required for the high-temperature gas to directly enter the second cavity and further improving the reliability of the battery device under thermal runaway. Furthermore, when the shortest distance between the channel structure and the second connectable section is less than half the height of the first cavity, the blocking and isolation effect of the channel structure within the first cavity allows a large amount of high-temperature flue gas emitted from the pressure relief section of the second battery cell to enter the second cavity under the guidance of the channel structure, while only a small amount of high-temperature flue gas can enter the first cavity. This diversion dissipates the energy of the high-temperature flue gas entering the second cavity, and the small amount of high-temperature flue gas is insufficient to affect the first battery cell connected to the first cavity, further reducing the risk of a thermal runaway chain reaction.

[0024] In some embodiments, the third connectable portion is configured as a third connectable port, the area of ​​which is not less than the cross-sectional area of ​​the pressure relief portion of the second battery cell.

[0025] In this way, most or all of the high-temperature flue gas can be reliably allowed to enter the second cavity through the third connectable port and be discharged to the outside, thereby improving the reliability of the battery device in the event of thermal runaway of the second battery cell.

[0026] In some embodiments, the exhaust structure includes a first exhaust layer and a second exhaust layer, the first exhaust layer and the second exhaust layer are stacked along a first direction, and the first exhaust layer has a first cavity and the second exhaust layer has a second cavity.

[0027] By setting the exhaust structure to an exhaust layer stacking method, the space occupied inside the box can be reduced, and a larger area can be covered to cover more battery cells, so as to release pressure and discharge more battery cells.

[0028] In some embodiments, the depth of the first cavity is greater than the depth of the second cavity along the first direction.

[0029] Because the second exhaust layer is farther from the pressure relief section of the battery cell along the stacking direction than the first exhaust layer, the exhaust height of the high-temperature flue gas from the pressure relief section to the second cavity of the second exhaust layer is increased. Therefore, the high-temperature flue gas loses energy during its flow to the second exhaust layer. Furthermore, if the high-temperature flue gas rebounds after entering the second cavity of the second exhaust layer, the rebound height to the pressure relief section is also higher, reducing the risk of rebound impacting the pressure relief section. Therefore, the depth of the second cavity can be appropriately reduced. Conversely, because the first exhaust layer is closer to the pressure relief section of the battery cell along the stacking direction than the second exhaust layer, the exhaust height of the high-temperature flue gas from the pressure relief section to the first cavity is lower. Therefore, appropriately increasing the depth of the first cavity can reduce the rebound risk caused by insufficient exhaust height of the high-temperature flue gas. Thus, overall, while reducing the rebound risk caused by insufficient exhaust height of the high-temperature flue gas, it is beneficial to reduce the overall height of the exhaust structure and the space occupied within the casing.

[0030] In some embodiments, along the first direction, the depth of the first cavity is not less than 8 mm, and the depth of the second cavity is not less than 6 mm.

[0031] In this way, the risk of rebound caused by insufficient high-temperature flue gas emission height can be further reduced, while the overall height of the exhaust structure can be reduced, thus reducing the space occupied in the housing.

[0032] In some embodiments, the first exhaust layer and the second exhaust layer are arranged adjacent to each other;

[0033] The first and second exhaust layers are fixedly connected to form an integral structure;

[0034] Alternatively, the first and second exhaust layers can be independent of each other and detachably connected.

[0035] By fixing adjacent first and second exhaust layers together to form an integral structure, the space occupied by the first and second exhaust layers within the enclosure can be reduced, and their installation within the enclosure becomes simpler. When two adjacent first and second exhaust layers are independent and detachably connected, their structure can be simplified, reducing manufacturing difficulty.

[0036] In some embodiments, the first connectable portion is configured as a first connectable port, and the area of ​​the first connectable port is not less than the cross-sectional area of ​​the pressure relief portion of the first battery cell.

[0037] In this way, most or all of the high-temperature flue gas can be reliably allowed to enter the first cavity through the first connectable port and be discharged to the outside, thereby improving the reliability of the battery device under the condition of thermal runaway of the first battery cell.

[0038] In some embodiments, the exhaust structure is configured as a carrier that supports multiple battery cells.

[0039] The pressure relief section of a battery cell is usually located at the bottom or top of the battery cell. Therefore, when the venting structure is constructed as a support for multiple battery cells, it can support the bottom or top of the battery cells, so that the battery cells can be more reliably connected to the venting structure, thereby improving the reliability of the battery device under thermal runaway of the battery cells.

[0040] In some embodiments, one end of the battery cell is provided with a tab, and the end of the battery cell opposite to the tab is provided with a pressure relief section, and the venting structure is located on the side of the battery cell with the pressure relief section.

[0041] By positioning the tabs of the battery cell relative to the pressure relief section, the interference of the protruding tabs on the position of the exhaust structure can be reduced when setting the exhaust structure. This allows the exhaust structure to be closer to the pressure relief section of the battery cell, enabling the high-temperature flue gas emitted from the pressure relief section to enter the exhaust channel of the exhaust layer more quickly and reliably.

[0042] In some embodiments, the pressure relief portion of the battery cell faces the top wall of the receiving cavity, and the exhaust structure is located between the battery cell and the top wall of the receiving cavity and is fixed to the top wall of the cavity.

[0043] Since the pressure relief section of the battery cell faces the top wall of the cavity, placing the exhaust structure between the battery cell and the top wall of the cavity, and fixing it to the top wall, can bring the exhaust structure closer to the pressure relief section and improve the reliability of the exhaust structure.

[0044] In some embodiments, the pressure relief portion of the battery cell faces the bottom wall of the receiving cavity, and the exhaust structure is located between the battery cell and the bottom wall of the receiving cavity and is fixed to the bottom wall of the cavity.

[0045] Since the pressure relief section of the battery cell faces the bottom wall of the cavity, placing the exhaust structure between the battery cell and the bottom wall of the cavity, and fixing it to the bottom wall, can bring the exhaust structure closer to the pressure relief section and improve the reliability of the exhaust structure.

[0046] Secondly, an electrical device is provided, including the battery device in any of the above embodiments.

[0047] 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, specific embodiments of this application are given below. Attached Figure Description

[0048] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0049] Figure 1 This is a structural schematic diagram of a vehicle according to one or more embodiments.

[0050] Figure 2 This is an exploded structural diagram of a battery device according to one or more embodiments.

[0051] Figure 3 This is an exploded structural diagram of a battery cell according to one or more embodiments.

[0052] Figure 4 This is a structural schematic diagram of a portion of the structure of a battery device according to one or more other embodiments.

[0053] Figure 5 for Figure 4 An exploded view of part of the battery device shown.

[0054] Figure 6 for Figure 5 A cross-sectional structural diagram of a portion of the battery device shown.

[0055] Figure 7 for Figure 6 A magnified view of part A in the partial structure of the battery device shown.

[0056] Figure 8 for Figure 6 A magnified schematic diagram of part B in the partial structure of the battery device shown.

[0057] Figure 9 This is an exploded structural diagram of a portion of the structure of a battery device according to one or more embodiments.

[0058] Figure 10 for Figure 9A cross-sectional structural diagram of a portion of the battery device shown.

[0059] Figure 11 for Figure 10 A magnified view of part C in the partial structure of the battery device shown.

[0060] Figure 12 This is a cross-sectional structural schematic diagram of a portion of a battery device according to one or more embodiments.

[0061] Figure 13 for Figure 12 A magnified schematic diagram of part D in the partial structure of the battery device shown.

[0062] Figure 14 for Figure 6 A schematic diagram of the channel structure in part of the battery device shown.

[0063] The reference numerals in the detailed embodiments are as follows:

[0064] 1000, Vehicle; 100, Battery assembly; 10, Housing; 11, First part; 12, Second part; 13, Receiving cavity; 20, Battery cell; 21, End cap; 211, Electrode terminal; 22, Housing; 23, Electrode assembly; 231, Tab; 24, Pressure relief section; 25, First battery cell; 26, Second battery cell; 30, Exhaust structure; 31, First cavity; 311, First top wall; 312, First bottom wall; 32, Second cavity; 321, Second top wall; 322, Second bottom wall; 33, First connectable part; 34, Second connectable part; 35, Third connectable part; 36, First exhaust layer; 37, Second exhaust layer; 38, Exhaust port; 40, Channel structure; 41, Channel wall; 200, Controller; 300, Motor. Detailed Implementation

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, 1 and / or 2 can represent: 1 existing alone, 1 and 2 existing simultaneously, and 2 existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following associated objects have an "or" relationship.

[0070] 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).

[0071] 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.

[0072] 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.

[0073] With the gradual development of power batteries, the requirements for their reliability are also constantly increasing. In order to improve the reliability of battery devices, each battery cell is usually equipped with an explosion-proof valve, rupture disc, or other pressure relief mechanism. When a battery cell experiences thermal runaway, a large amount of high-temperature fumes are usually generated inside. At this time, the pressure relief mechanism can open and allow the high-temperature fumes inside the battery cell to be discharged to the outside, thus preventing the battery cell from exploding.

[0074] A battery assembly typically comprises multiple individual battery cells housed within a casing. When one battery cell experiences thermal runaway, the high-temperature fumes it releases enter the casing, causing a rise in temperature and pressure. These fumes can easily negatively impact other battery cells, potentially triggering their thermal runaway and creating a chain reaction that could lead to a fire and explosion. Furthermore, the high-temperature fumes can negatively affect other components within the casing, such as igniting and short-circuiting wiring harnesses or igniting molded parts, further increasing the risk of an overall battery explosion.

[0075] To mitigate the negative impact of high-temperature fumes emitted by thermally runaway battery cells on other battery cells and structures within the enclosure, a structure can be incorporated to guide the flow of these fumes. For example, an exhaust channel can be installed within the enclosure, with each battery cell's explosion-proof valve aligned with it. This ensures that high-temperature fumes from each cell are discharged into the exhaust channel, reducing their negative impact on other structures. However, this design still cannot completely eliminate the negative impact of high-temperature fumes on other battery cells, and the flow of these fumes to other explosion-proof valves can easily trigger them, potentially causing a chain reaction within the enclosure. Furthermore, with increasing market demand, higher energy density batteries (referring to battery devices with high energy density (≥760Wh / L) and high power density) are an inevitable trend. High-energy-density battery devices exhibit significantly higher runaway valve temperatures and ejected material quality, further increasing the risk of thermal runaway chain reactions between battery cells and further reducing the reliability of the battery device.

[0076] Based on the above considerations, in order to reduce the negative impact of high-temperature flue gas emitted from the thermal runaway of a single battery cell on other battery cells and other structures, this application provides a battery device, including a housing, multiple battery cells, an exhaust structure, and a channel structure. The housing has a receiving cavity, within which multiple battery cells are disposed. Each battery cell has a pressure relief section. The multiple battery cells include a first battery cell and a second battery cell. The exhaust structure is located on the same side of the first and second battery cells along a first direction. The exhaust mechanism is correspondingly arranged with the pressure relief section. The exhaust structure includes a first cavity and a second cavity, with the first cavity located between the second cavity and the battery cell. The exhaust structure further includes a first connectable section and a second connectable section. The first connectable section is located between the pressure relief section of the first battery cell and the first cavity, for connecting the pressure relief section of the first battery cell to the first cavity. The second connectable section is located between the pressure relief section of the second battery cell and the second cavity, for connecting the pressure relief section of the second battery cell to the second cavity. One end of the channel structure is correspondingly disposed to the pressure relief part of the second battery cell, and the other end of the channel structure is connected to the second connectable part. The channel structure also includes a channel wall forming the channel, and at least a portion of the channel wall is located in the first cavity.

[0077] Thus, when the first battery cell experiences thermal runaway and emits high-temperature fumes from the pressure relief section, the fumes can be released into the first cavity through the first connectable section. When the second battery cell experiences thermal runaway and emits high-temperature fumes from the pressure relief section, the fumes can be released into the second cavity through the second connectable section. Since the high-temperature fumes emitted from the second battery cell enter the second cavity through a channel structure at least partially located in the first cavity, the high-temperature fumes emitted from the second battery cell are blocked by the inner wall of the channel structure during their entry into the second cavity, reducing or blocking the impact of the high-temperature gas on the first battery cell through the first cavity and the first connectable section. Correspondingly, after entering the first cavity, the high-temperature fumes emitted from the first battery cell are blocked by the outer wall of the channel structure, which also reduces or blocks the impact of the high-temperature gas on the second battery cell through the first cavity and the second connectable section.

[0078] Therefore, the overall negative impact of the high-temperature flue gas emitted by the first and second battery cells on each other is reduced, the risk of thermal runaway chain reaction in the box is reduced, and the reliability of the battery device is improved.

[0079] The battery devices disclosed in this application can be used, but are not limited to, in electrical equipment such as vehicles, ships, or aircraft.

[0080] 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.

[0081] 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.

[0082] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0083] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0084] Please refer to Figure 2 , Figure 2This is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for accommodating the battery cell 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one open end, and the first portion 11 may be a plate-like structure, covering the open side of the second portion 12 so that the first portion 11 and the second portion 12 jointly define the space; alternatively, the first portion 11 and the second portion 12 may both be hollow structures with one open side, with the open side of the first portion 11 covering the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 can be of various shapes, such as a cylinder, a cuboid, etc.

[0085] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form battery device modules, and then these modules are connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0086] Each battery cell 20 can be a secondary battery device or a primary battery device; it can also be a lithium-sulfur battery device, a sodium-ion battery device, or a magnesium-ion battery device, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes.

[0087] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 20 provided in some embodiments of this application. The battery cell 20 refers to the smallest unit constituting the battery device 100. For example... Figure 3 The battery cell 20 includes an end cap 21, a housing 22, an electrode assembly 23, and other functional components.

[0088] End cap 21 refers to a component that covers the opening of housing 22 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 21 can be adapted to the shape of housing 22 to fit it. Optionally, end cap 21 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 21 is not easily deformed under pressure and impact, allowing battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 211 can be provided on end cap 21. Electrode terminals 211 can be used for electrical connection with electrode assembly 23 to output or input electrical energy to battery cell 20. In some embodiments, end cap 21 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 20 reaches a threshold. The material of end cap 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating element may be provided on the inner side of the end cap 21. The insulating element can be used to isolate the electrical connection components within the housing 22 from the end cap 21 to reduce the risk of short circuits. For example, the insulating element may be made of plastic, rubber, etc.

[0089] The housing 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap 21 can be independent components. An opening can be provided on the housing 22, and the end cap 21 can be used to close the opening to form the internal environment of the battery cell 20. Alternatively, the end cap 21 and the housing 22 can be integrated. Specifically, the end cap 21 and the housing 22 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 22, the end cap 21 closes the housing 22. The housing 22 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.

[0090] Electrode assembly 23 is the component in the battery cell 20 where the electrochemical reaction occurs. The casing 22 may contain one or more electrode assemblies 23. Electrode assembly 23 mainly consists of positive and negative electrode materials, a separator, and a current collector. Specifically, positive electrode material is coated onto the output electrode connector of the battery device to form a positive electrode sheet, and negative electrode material is coated onto the output electrode connector of the battery device to form a negative electrode sheet. The positive and negative electrode sheets are wound or stacked, and a separator is disposed between the positive and negative electrode sheets, thus forming electrode assembly 23. The portions of the positive and negative electrode sheets containing active material constitute the main body of electrode assembly 23, while the portions of the positive and negative electrode sheets without active material each constitute tabs 231. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs 231 connect to the electrode terminals 211 to form a current loop.

[0091] Figure 4 This is a structural schematic diagram of a portion of the structure of a battery device according to one or more other embodiments. Figure 5 for Figure 4 An exploded view of part of the battery device shown. Figure 6 for Figure 5 A cross-sectional structural diagram of a portion of the battery device shown. Figure 7 for Figure 6 A magnified view of part A in the partial structure of the battery device shown. Figure 8 for Figure 6 A magnified schematic diagram of part B in the structure of the battery device shown. See attached diagram. Figures 4-8This application provides a battery device 100, including a housing 10, a plurality of battery cells 20, an exhaust structure 30, and a channel structure 40. The housing 10 has a receiving cavity 13, in which the plurality of battery cells 20 are disposed. Each battery cell 20 has a pressure relief portion 24. The plurality of battery cells 20 includes a first battery cell 25 and a second battery cell 26. The exhaust structure 30 is located on the same side of the first battery cell 25 and the second battery cell 26 along a first direction. The exhaust structure 30 is correspondingly arranged with the pressure relief portion 24. The exhaust structure 30 includes a first cavity 31 and a second cavity 32. The first cavity 31 is located between the second cavity 32 and the battery cell 20. The exhaust structure 30 further includes a first connectable portion 33 and a second connectable portion 34. The first connectable portion 33 is located between the pressure relief portion 24 of the first battery cell 25 and the first cavity 31, for connecting the pressure relief portion 24 of the first battery cell 25 and the first cavity 31. The second connectable portion 34 is located between the pressure relief portion 24 of the second battery cell 26 and the second cavity 32, for connecting the pressure relief portion 24 of the second battery cell 26 and the second cavity 32. One end of the channel structure 40 is correspondingly disposed to the pressure relief portion 24 of the second battery cell 26, and the other end of the channel structure 40 is connected to the second connectable portion 34. The channel structure 40 also includes a channel wall 41 forming a channel, at least a portion of which is located within the first cavity 31.

[0092] The receiving cavity 13 refers to the cavity that houses the battery cell 20 and other parts of the battery device 100, which can be formed by the first part 11 and the second part 12 mentioned above.

[0093] The pressure relief section 24 of the battery cell 20 is a structure that can open when the pressure or temperature inside the battery cell 20 reaches a threshold, releasing the high-temperature and high-pressure substances inside and reducing the risk of explosion or combustion of the battery cell 20. The pressure relief section 24 is typically in the form of a pressure relief diaphragm, with grooves on the diaphragm as weak points. These weak points are damaged under high temperature and pressure, connecting the inside and outside of the battery cell 20 to release the high-temperature and high-pressure substances. Specifically, the pressure relief section 24 can be located on the end cap 21 of the battery cell 20.

[0094] The pressure relief section 24 of the battery cell 20 can be provided on the end cap 21 of the battery cell 20 or on the bottom wall of the battery cell 20. In a specific embodiment of this application, the pressure relief section 24 is provided on the bottom wall of the battery cell 20, that is, when the battery cell 20 experiences thermal runaway, the high-temperature flue gas inside the battery cell 20 will be ejected to the bottom through the pressure relief section 24. The first battery cell 25 and the second battery cell 26 can be two battery cells 20 from all the battery cells 20. Of course, the battery device 100 can also have only the first battery cell 25 and the second battery cell 26. In addition, the first battery cell 25 and the second battery cell 26 can be adjacent or not adjacent. For example, at least one battery cell 20 can be provided between them.

[0095] Exhaust structure 30 refers to a structure capable of discharging high-temperature flue gas outwards. The first direction can be as follows: Figure 6 The vertical direction shown can also be a direction parallel to the height direction of the battery cell 20. The exhaust structure 30 is provided correspondingly to the pressure relief section 24, meaning that the exhaust structure 30 can receive the high-temperature flue gas discharged from the pressure relief section 24 and then discharge it to the outside.

[0096] The first connectable portion 33 of the exhaust structure 30 connects the pressure relief portion 24 of the first battery cell 25 with the first cavity 31. Specifically, the first connectable portion 33 is not limited to a hole, pipe, or cavity. The second connectable portion 34 connects the pressure relief portion 24 of the second battery cell 26 with the second cavity 32. Specifically, the second connectable portion 34 is not limited to a hole, pipe, or cavity.

[0097] One end of the channel structure 40 is correspondingly disposed to the pressure relief section 24 of the second battery cell 26, meaning that the channel structure 40 can receive and transmit the high-temperature flue gas discharged from the pressure relief section 24 of the second battery cell 26. Combined with... Figure 14 The channel wall 41 is the main part that forms the channel structure 40. Specifically, the channel wall 41 can be an annular wall or other shapes formed by multiple walls.

[0098] Thus, in the battery device 100 of this application embodiment, when the first battery cell 25 experiences thermal runaway and emits high-temperature fumes from the pressure relief section 24, the fumes can be released through the first connectable section 33 into the first cavity 31. When the second battery cell 26 of the battery device 100 experiences thermal runaway and emits high-temperature fumes from the pressure relief section 24, the fumes can be released through the second connectable section 34 into the second cavity 32. Furthermore, since the high-temperature fumes emitted by the second battery cell 26 enter the second cavity 32 through the channel structure 40, which is at least partially located within the first cavity 31, the second battery cell... As the high-temperature flue gas emitted from cell 26 enters the second cavity 32, it is blocked by the inner wall of the channel wall 41 of the channel structure 40, which reduces or blocks the impact of the high-temperature gas on the first cell 25 through the first cavity 31 and the first connectable part 33. Correspondingly, after the high-temperature flue gas emitted from the first cell 25 enters the first cavity 31, it is blocked by the outer wall of the channel wall 41 of the channel structure 40, which also reduces or blocks the impact of the high-temperature gas on the second cell 26 through the first cavity 31 and the second connectable part 34.

[0099] Therefore, the negative impact of the high-temperature flue gas emitted by the first battery cell 25 and the second battery cell 26 on each other is reduced, the risk of thermal runaway chain reaction in the housing 10 is reduced, and the reliability of the battery device 100 is improved.

[0100] Specifically, in the embodiments of this application, the first battery cell 25 and the second battery cell 26 are any two adjacent battery cells 20 among a plurality of battery cells 20.

[0101] When the first battery cell 25 and the second battery cell 26 are adjacent, the negative impact of the high-temperature flue gas emitted by the adjacent first battery cell 25 and the second battery cell 26 on each other is reduced, the risk of thermal runaway chain reaction in the housing 10 is reduced, and the reliability of the battery device 100 is improved.

[0102] See Figure 7 and Figure 8 According to some embodiments of this application, the inner wall of the first cavity 31 includes a first top wall 311 and a first bottom wall 312, and the inner wall of the second cavity 32 includes a second top wall 321 and a second bottom wall 322. The first top wall 311 is provided with a first connectable portion 33 and a third connectable portion 35 spaced apart. The third connectable portion 35 is correspondingly provided with the pressure relief portion 24 of the second battery cell 26. The second top wall 321 is provided with a second connectable portion 34, and one end of the channel structure 40 is sealed to the second connectable portion 34.

[0103] The third connectable portion 35 is correspondingly provided with the pressure relief portion 24 of the second battery cell 26, meaning that the high-temperature flue gas discharged from the pressure relief portion 24 of the second battery cell 26 can enter the third connectable portion 35. Specifically, the third connectable portion 35 is not limited to holes, pipes, or cavities. A sealed connection refers to a leak-free connection between the two. The sealed connection can be integrally formed, or it can be achieved by welding or bonding two independent components.

[0104] When the pressure relief section 24 of the second battery cell 26 emits high-temperature flue gas, it can enter the second cavity 32 through the third connectable part 35 on the first top wall 311 of the first cavity 31 and the channel structure 40. Since one end of the channel structure 40 is sealed to the second connectable part 34, the high-temperature flue gas entering the channel structure 40 through the third connectable part 35 can directly enter the second cavity 32 under the guidance of the channel structure 40. In this way, on the one hand, the installation position of the channel structure 40 is reliable and the guiding effect of the high-temperature flue gas is reliable. On the other hand, the method of setting the third connectable part 35 on the first cavity 31 is simpler. Since the channel wall 41 of the channel structure 40 is also at least partially located in the first cavity 31, the third connectable part 35 is located on the first cavity 31, making it closer to the channel structure 40, which is more conducive to guiding the high-temperature flue gas into the channel structure 40 and further into the second cavity 32 for release.

[0105] Furthermore, one end of the channel structure 40 is sealed to the second connectable portion 34, and the other end of the channel structure 40 is spaced apart from the third connectable portion 35.

[0106] Thus, when the pressure relief section 24 of the second battery cell 26 emits high-temperature flue gas, a portion of it can enter the first cavity 31 through the gap created between the third connectable section 35 and the channel structure 40, while the other portion enters the second cavity 32 under the guidance of the channel structure 40. In this way, the high-temperature flue gas emitted by the pressure relief section 24 of the second battery cell 26 can be diverted, reducing the energy of the high-temperature gas directly entering the second cavity 32, and further improving the reliability of the battery device 100 under thermal runaway.

[0107] Specifically, the shortest distance h between the channel structure 40 and the third connectable part 35 is less than 1 / 2 of the height H of the first cavity.

[0108] Thus, through the blocking and isolation effect of the channel structure 40 in the first cavity 31, a large amount of high-temperature flue gas ejected from the pressure relief section 24 of the second battery cell 26 can enter the second cavity 32 under the guidance of the channel structure 40. Only a small amount of high-temperature flue gas can enter the first cavity 31. On the one hand, the energy of the high-temperature flue gas entering the second cavity 32 can be dissipated by diversion. On the other hand, the small amount of high-temperature flue gas is not enough to affect the first battery cell 25 connected to the first cavity 31, further reducing the risk of thermal runaway chain reaction.

[0109] See Figures 9-11 In some other embodiments, the other end of the channel structure 40 may be sealed to the third connectable portion 35.

[0110] In this way, when the pressure relief section 24 of the second battery cell 26 emits high-temperature flue gas, it can enter the second cavity 32 through the third connectable part 35 on the first top wall 311 of the first cavity 31 and the channel structure 40. Since the other end of the channel structure 40 is sealed to the third connectable part 35, the high-temperature gas can directly enter the channel structure 40 through the third connectable part 35 and further enter the second cavity 32 under the guidance of the channel structure 40. In this way, on the one hand, the installation position of the channel structure 40 is reliable and the guiding effect of the high-temperature flue gas is reliable. On the other hand, the method of setting the third connectable part 35 on the first cavity 31 is simpler. Since the channel wall 41 of the channel structure 40 is also at least partially located in the first cavity 31, the third connectable part 35 is located on the first cavity 31, making it closer to the channel structure 40, which is more conducive to guiding the high-temperature flue gas into the channel structure 40 and further into the second cavity 32 for release.

[0111] Furthermore, the other end of the channel structure 40 is sealed to the third connectable portion 35, and one end of the channel structure 40 is spaced apart from the second connectable portion 34.

[0112] Thus, when the pressure relief section 24 of the second battery cell 26 emits high-temperature flue gas, a portion of it can enter the first cavity 31 through the gap created between the second connectable section 34 and the channel structure 40, while the other portion enters the second cavity 32 under the guidance of the channel structure 40. In this way, the high-temperature flue gas emitted by the pressure relief section 24 of the second battery cell 26 can be diverted, reducing the energy of the high-temperature gas directly entering the second cavity 32, and further improving the reliability of the battery device 100 under thermal runaway.

[0113] Specifically, the shortest distance h between the channel structure 40 and the second connectable part 34 is less than 1 / 2 of the height H of the first cavity.

[0114] Thus, through the blocking and isolation effect of the channel structure 40 in the first cavity 31, a large amount of high-temperature flue gas ejected from the pressure relief section 24 of the second battery cell 26 can enter the second cavity 32 under the guidance of the channel structure 40. Only a small amount of high-temperature flue gas can enter the first cavity 31. On the one hand, the energy of the high-temperature flue gas entering the second cavity 32 can be dissipated by diversion. On the other hand, the small amount of high-temperature flue gas is not enough to affect the first battery cell 25 connected to the first cavity 31, further reducing the risk of thermal runaway chain reaction.

[0115] See Figure 12 and Figure 13 In other embodiments, one end of the channel structure 40 is sealed to the second connectable portion 34, and the other end of the channel structure 40 is sealed to the third connectable portion 35.

[0116] Thus, when the pressure relief section 24 of the second battery cell 26 emits high-temperature flue gas, it can enter the second cavity 32 directly through the third connectable section 35 on the first top wall 311 of the first cavity 31, the channel structure 40, and the second connectable section 34. The high-temperature flue gas is isolated from the first cavity 31 through the channel structure 40, thereby preventing the high-temperature flue gas emitted by the second battery cell 26 from entering the first cavity 31 and affecting the first battery cell 25.

[0117] See Figure 4 According to some embodiments of this application, the exhaust structure 30 includes a first exhaust layer 36 and a second exhaust layer 37, the first exhaust layer 36 and the second exhaust layer 37 are stacked along a first direction, and the first exhaust layer has a first cavity 31 and the second exhaust layer 37 has a second cavity 32.

[0118] An exhaust layer refers to a layered structure used for exhausting gas; the layered structure is similar to a thin sheet or has a relatively thin thickness. In a specific embodiment of this application, the first exhaust layer 36 and the second exhaust layer 37 are hollow rectangular bodies. The first exhaust layer 36 and the second exhaust layer 37 are stacked, which can be stacked along the pressure relief direction of the pressure relief part 24 in this embodiment of the application. Specifically, the pressure relief direction is the height direction of the battery cell 20, so that the high-temperature flue gas discharged from the pressure relief part 24 can be directly injected into the exhaust layer without turning. In addition, the first exhaust layer 36 and the second exhaust layer 37 are both hollow structures to form corresponding first cavities 31 and second cavities 32, and both the first exhaust layer 36 and the second exhaust layer 37 are in communication with the outside. Specifically, the first exhaust layer 36 and the second exhaust layer 37 also include an exhaust port 38, which is in communication with the outside of the housing 10.

[0119] By setting the exhaust structure 30 to an exhaust layer stacking method, the space occupied in the housing 10 can be reduced, and it has a larger area to cover more battery cells 20, so as to release pressure and discharge more battery cells 20.

[0120] See Figure 11 According to some embodiments of this application, along a first direction, the depth H1 of the first cavity 31 is greater than the depth H2 of the second cavity 32.

[0121] Because the second exhaust layer 37 is farther from the pressure relief section 24 of the battery cell 20 along the stacking direction than the first exhaust layer 36, the exhaust height of the high-temperature flue gas from the pressure relief section 24 to the second cavity 32 of the second exhaust layer 37 is increased. Therefore, the high-temperature flue gas loses energy during its flow to the second exhaust layer 37. Furthermore, if the high-temperature flue gas rebounds after entering the second cavity 32 of the second exhaust layer 37, the rebound height to the pressure relief section 24 is also higher, reducing the risk of the rebound impacting the pressure relief section 24. Therefore, the depth H2 of the second cavity 32 can be appropriately reduced. Conversely, because the first exhaust layer 36 is closer to the pressure relief section 24 of the battery cell 20 along the stacking direction than the second exhaust layer 37, the exhaust height of the high-temperature flue gas from the pressure relief section 24 to the first cavity 31 is lower. Therefore, appropriately increasing the depth of the first cavity 31 can reduce the risk of rebound caused by insufficient exhaust height of the high-temperature flue gas. Therefore, overall, while reducing the risk of rebound caused by insufficient high-temperature flue gas emission height, it is also beneficial to reduce the overall height of the exhaust structure 30 and reduce the space occupied in the housing 10.

[0122] Specifically, along the first direction, the depth of the first cavity 31 is not less than 8 mm, and the depth of the second cavity 32 is not less than 6 mm.

[0123] In this way, the risk of rebound caused by insufficient high temperature flue gas emission height can be further reduced, while the overall height of the exhaust structure 30 can be reduced, thus reducing the space occupied in the housing 10.

[0124] According to some embodiments of this application, the first connectable portion 33 is configured as a first connectable port, and the area of ​​the first connectable port is not less than the cross-sectional area of ​​the pressure relief portion 24 of the first battery cell 25.

[0125] Normally, when high-temperature flue gas is discharged from the pressure relief section 24 of the first battery cell 25, the high-temperature flue gas is discharged outward in a cone shape. Therefore, by providing the area of ​​the first connectable port on the first cavity 31 of the first exhaust layer 36 that is not less than the cross-sectional area of ​​the pressure relief section 24 of the first battery cell 25, most or all of the high-temperature flue gas can be reliably allowed to enter the first cavity 31 through the first connectable port and be discharged outward, thereby improving the reliability of the battery device 100 in the event of thermal runaway of the first battery cell 25.

[0126] Specifically, the area of ​​the first connectable port can be adjusted according to the distance between the first connectable port and the pressure relief part 24.

[0127] According to some embodiments of this application, the third connectable portion 35 is configured as a third connectable port, and the area of ​​the third connectable port is not less than the cross-sectional area of ​​the pressure relief portion 24 of the second battery cell 26.

[0128] In this way, most or all of the high-temperature flue gas can be reliably allowed to enter the second cavity 32 through the third connectable port and be discharged outward, thereby improving the reliability of the battery device 100 in the event of thermal runaway of the second battery cell 26.

[0129] See Figure 9 According to some embodiments of this application, the first exhaust layer 36 and the second exhaust layer 37 are arranged adjacent to each other and fixedly connected to form an integral structure.

[0130] An integral structure refers to a structure that cannot be separated, meaning that the first exhaust layer 36 and the second exhaust layer 37 cannot be separated.

[0131] By fixing adjacent first exhaust layer 36 and second exhaust layer 37 together to form an integral structure, the space occupied by the first exhaust layer 36 and second exhaust layer 37 in the housing 10 can be reduced, and the installation of the first exhaust layer 36 and second exhaust layer 37 in the housing 10 is also simplified.

[0132] See Figure 4 and Figure 5 In other embodiments, the first exhaust layer 36 and the second exhaust layer 37 are independent of each other and detachably connected.

[0133] The independent arrangement of the first exhaust layer 36 and the second exhaust layer 37 means that the first exhaust layer 36 and the second exhaust layer 37 are independent components and can be manufactured separately.

[0134] When two adjacent first exhaust layers 36 and second exhaust layers 37 are independent of each other and detachably connected, the structure of the first exhaust layer 36 and the second exhaust layer 37 can be simplified, reducing the manufacturing difficulty.

[0135] According to some embodiments of this application, the exhaust structure 30 is configured as a carrier for supporting a plurality of battery cells 20.

[0136] The pressure relief section 24 of the battery cell 20 is usually located at the bottom or top of the battery cell 20. Therefore, when the exhaust structure 30 is constructed as a support for multiple battery cells 20, it can support the bottom or top of the battery cell 20, so that the battery cell 20 can be more reliably connected to the exhaust structure 30, thereby improving the reliability of the battery device 100 under thermal runaway of the battery cell 20.

[0137] According to some embodiments of this application, one end of the battery cell 20 is provided with a tab 231, and the end of the battery cell 20 opposite to the tab 231 is provided with a pressure relief part 24. The exhaust structure 30 is located on the side of the battery cell 20 with the pressure relief part 24.

[0138] By positioning the tabs 231 of the battery cell 20 opposite to the pressure relief section 24, the interference of the protruding tabs 231 on the position of the exhaust structure 30 can be reduced when the exhaust structure 30 is installed. This allows the exhaust structure 30 to be closer to the pressure relief section 24 of the battery cell 20, enabling the high-temperature flue gas emitted from the pressure relief section 24 to enter the first chamber 31 or the second chamber 32 of the exhaust structure 30 more quickly and reliably.

[0139] Optionally, the top of the battery cell 20 is provided with a tab 231, the bottom of the battery cell 20 is provided with a pressure relief part 24, and the exhaust structure 30 is located on one side of the bottom of the battery cell 20.

[0140] According to some embodiments of this application, the pressure relief portion 24 of the battery cell 20 faces the top wall of the receiving cavity 13, and the exhaust structure 30 is located between the battery cell 20 and the top wall of the receiving cavity 13 and is fixed to the top wall of the cavity.

[0141] The top wall of the receiving cavity 13 refers to the top wall of the receiving cavity 13 of the box 10 along the vertical direction.

[0142] Since the pressure relief portion 24 of the battery cell 20 faces the top wall of the receiving cavity 13, the exhaust structure 30 is disposed between the battery cell 20 and the top wall of the receiving cavity 13 and fixed to the top wall of the cavity. This allows the exhaust structure 30 to be closer to the pressure relief portion 24 and also improves the fixation reliability of the exhaust structure 30.

[0143] In other embodiments, the pressure relief portion 24 of the battery cell 20 faces the bottom wall of the receiving cavity 13, and the exhaust structure 30 is located between the battery cell 20 and the bottom wall of the receiving cavity 13 and is fixed to the bottom wall of the cavity.

[0144] The bottom wall of the receiving cavity 13 refers to the bottom wall of the receiving cavity 13 of the box body 10 along the vertical direction.

[0145] Since the pressure relief portion 24 of the battery cell 20 faces the bottom wall of the receiving cavity 13, the exhaust structure 30 is disposed between the battery cell 20 and the bottom wall of the receiving cavity 13 and fixed to the bottom wall of the cavity. This allows the exhaust structure 30 to be closer to the pressure relief portion 24 and also improves the fixation reliability of the exhaust structure 30.

[0146] In a specific embodiment of this application, the pressure relief portion 24 of the battery cell 20 faces the bottom wall of the receiving cavity 13, and the exhaust structure 30 is located between the battery cell 20 and the bottom wall of the receiving cavity 13. The exhaust structure 30 carries the battery cell 20 and is fixed to the bottom wall of the receiving cavity 13.

[0147] Optionally, the exhaust structure 30 can be fixed to the top or bottom wall of the housing 10 by means of sliding, hinge, locking, welding, etc.

[0148] According to some embodiments of this application, this application also provides an electrical device including the battery device 100 in any of the above embodiments.

[0149] Thus, when the first battery cell 25 experiences thermal runaway and emits high-temperature fumes from the pressure relief section 24, the fumes can be released into the first cavity 31 through the first connectable section 33. Similarly, when the second battery cell 26 of the battery device 100 experiences thermal runaway and emits high-temperature fumes from the pressure relief section 24, the fumes can be released into the second cavity 32 through the second connectable section 34. Furthermore, since the high-temperature fumes emitted by the second battery cell 26 enter the second cavity 32 through the channel structure 40, which is at least partially located within the first cavity 31, the fumes emitted by the second battery cell 26... As the high-temperature flue gas enters the second cavity 32, it is blocked by the inner wall of the channel wall 41 of the channel structure 40, which reduces or blocks the impact of the high-temperature gas on the first battery cell 25 through the first cavity 31 and the first connectable part 33. Correspondingly, after the high-temperature flue gas emitted from the first battery cell 25 enters the first cavity 31, it is blocked by the outer wall of the channel wall 41 of the channel structure 40, which also reduces or blocks the impact of the high-temperature gas on the second battery cell 26 through the first cavity 31 and the second connectable part 34.

[0150] Therefore, the negative impact of the high-temperature flue gas emitted by the first battery cell 25 and the second battery cell 26 on each other is reduced, the risk of thermal runaway chain reaction in the housing 10 is reduced, and the reliability of the battery device 100 is improved.

[0151] 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 box-shaped enclosure has a receiving cavity; Multiple battery cells are disposed within the receiving cavity, each battery cell having a pressure relief section, and the multiple battery cells include a first battery cell and a second battery cell. An exhaust structure is located on the same side of the first battery cell and the second battery cell along a first direction. The exhaust structure is correspondingly provided with the pressure relief part. The exhaust structure includes a first cavity and a second cavity, with the first cavity located between the second cavity and the battery cell. The exhaust structure further includes a first connectable portion and a second connectable portion. The first connectable portion is located between the pressure relief portion of the first battery cell and the first cavity, and is used to connect the pressure relief portion of the first battery cell and the first cavity. The second connectable portion is located between the pressure relief portion of the second battery cell and the second cavity, and is used to connect the pressure relief portion of the second battery cell and the second cavity. The channel structure has one end corresponding to the pressure relief portion of the second battery cell, and the other end of the channel structure is connected to the second connectable portion. The channel structure also includes a channel wall forming the channel, and at least a portion of the channel wall is located in the first cavity.

2. The battery device according to claim 1, characterized in that, The first battery cell and the second battery cell are any two adjacent battery cells among the plurality of battery cells.

3. The battery device according to claim 1 or 2, characterized in that, The inner wall of the first cavity includes a first top wall and a first bottom wall, and the inner wall of the second cavity includes a second top wall and a second bottom wall; The first top wall is provided with a first connectable portion and a third connectable portion spaced apart, and the third connectable portion is provided corresponding to the pressure relief portion of the second battery cell; The second top wall is provided with the second connectable portion, one end of the channel structure is sealed to the second connectable portion; and / or the other end of the channel structure is sealed to the third connectable portion.

4. The battery device according to claim 3, characterized in that, One end of the channel structure is sealed to the second connectable portion; the other end of the channel structure is spaced apart from the third connectable portion, and the shortest distance between the channel structure and the third connectable portion is less than 1 / 2 of the height of the first cavity. or The other end of the channel structure is sealed to the third connectable portion; one end of the channel structure is spaced apart from the second connectable portion, and the shortest distance between the channel structure and the second connectable portion is less than 1 / 2 of the height of the first cavity.

5. The battery device according to claim 3, characterized in that, The third connectable portion is configured as a third connectable port, and the area of ​​the third connectable port is not less than the cross-sectional area of ​​the pressure relief portion of the second battery cell.

6. The battery device according to claim 1, characterized in that, The exhaust structure includes a first exhaust layer and a second exhaust layer, which are stacked along the first direction. The first exhaust layer has a first cavity, and the second exhaust layer has a second cavity.

7. The battery device according to claim 6, characterized in that, Along the first direction, the depth of the first cavity is greater than the depth of the second cavity.

8. The battery device according to claim 7, characterized in that, Along the first direction, the depth of the first cavity is not less than 8 mm, and the depth of the second cavity is not less than 6 mm.

9. The battery device according to claim 6, characterized in that, The first exhaust layer and the second exhaust layer are arranged adjacent to each other; The first exhaust layer and the second exhaust layer are fixedly connected to form an integral structure; or The first exhaust layer and the second exhaust layer are independent of each other and are detachably connected.

10. The battery device according to claim 1, characterized in that, The first connectable portion is configured as a first connectable port, and the area of ​​the first connectable port is not less than the cross-sectional area of ​​the pressure relief portion of the first battery cell.

11. The battery device according to claim 1, characterized in that, The exhaust structure is configured as a support for the plurality of battery cells.

12. The battery device according to claim 1, characterized in that, One end of the battery cell is provided with a tab, and the end of the battery cell opposite to the tab is provided with the pressure relief section. The venting structure is located on the side of the battery cell with the pressure relief section.

13. The battery device according to claim 1, characterized in that, The pressure relief portion of the battery cell faces the top wall of the receiving cavity, and the exhaust structure is located between the battery cell and the top wall of the receiving cavity, and is fixed to the top wall of the cavity; or The pressure relief portion of the battery cell faces the bottom wall of the receiving cavity, and the exhaust structure is located between the battery cell and the bottom wall of the receiving cavity and is fixed to the bottom wall of the cavity.

14. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 13.

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