Battery device, energy storage device and electric device

Abstract

The embodiment of the utility model provides a battery device, an energy storage device and a power utilization device. The battery device comprises a box body assembly, a battery monomer assembly and a pressure relief mechanism, and a first accommodating cavity and an exhaust structure are formed in the box body assembly. The battery monomer assembly is mounted in the first accommodating cavity; the pressure relief mechanism is arranged on the box body assembly. An exhaust channel is formed in the box body assembly, the pressure relief mechanism is communicated with the exhaust channel, the first containing cavity is communicated with the exhaust channel through the exhaust structure, and the exhaust channel at least comprises a bent section. The battery device provided by the embodiment of the utility model is beneficial to reducing the condition that other parts in the battery device are damaged by high-temperature fluid. Besides, the exhaust passage at least comprises one bent section, so that the length of the exhaust passage is increased, high-temperature fluid generated by thermal runaway of the battery device can be cooled, namely, the temperature of the fluid exhausted by the exhaust passage can be reduced, and the battery device is more convenient to use. And the condition of open fire caused by combustion after the fluid exhausted through the exhaust channel is in contact with oxygen is reduced.

Description

Technical Field

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

[0002] In electrical devices equipped with battery units, the battery unit can provide all or part of the power. During the use of the battery unit, the individual battery cells within the battery unit generate heat. In related technologies, during thermal runaway of the battery unit, high-temperature fluids may leak from the battery unit, potentially damaging the electrical device. Utility Model Content

[0003] In view of this, the present disclosure aims to provide a battery device, an energy storage device, and an electrical device that can reduce the temperature of the fluid discharged by the battery device due to thermal runaway to a certain extent.

[0004] Therefore, a first aspect of the present disclosure provides a battery device, comprising:

[0005] The housing assembly forms a first receiving cavity and an exhaust structure;

[0006] A battery cell assembly, wherein the battery cell assembly is installed in the first receiving cavity;

[0007] A pressure relief mechanism is disposed on the housing assembly;

[0008] The housing assembly forms an exhaust channel, the pressure relief mechanism is connected to the exhaust channel, the first receiving cavity is connected to the exhaust channel via the exhaust structure, and the exhaust channel includes at least a bent section.

[0009] The battery device provided in this embodiment includes a housing assembly and a battery cell assembly. The housing assembly has a first receiving cavity, and the battery cell assembly is disposed within the first receiving cavity. The housing assembly protects the battery cell assembly. By forming an exhaust channel in the housing assembly, and having a pressure relief mechanism connected to the exhaust channel, and the first receiving cavity connected to the exhaust channel via an exhaust structure, the high-temperature fluid generated during thermal runaway of the battery device can flow into the exhaust channel through the exhaust structure and then be discharged through the exhaust channel. This helps to reduce the possibility of the high-temperature fluid damaging other components within the battery device. Furthermore, by including at least one bend in the exhaust channel, the length of the exhaust channel is increased, thereby cooling the high-temperature fluid generated during thermal runaway of the battery device. This reduces the temperature of the fluid discharged through the exhaust channel, decreasing the risk of combustion and open flame caused by the fluid coming into contact with oxygen.

[0010] In some embodiments, the exhaust passage includes a first straight extension, a second straight extension, and the bent section, wherein the first straight extension and the second straight extension both extend along a first direction, and the bent section connects the first straight extension and the second straight extension.

[0011] In this embodiment, by extending both the first straight extension segment and the second straight extension segment along the first direction, and connecting the first straight extension segment and the second straight extension segment with a bent segment, the exhaust channel is extended in a bent manner, thereby increasing the length of the exhaust channel.

[0012] In some embodiments, the projections of the first straight line extension and the second straight line extension in the second direction at least partially overlap, and the second direction intersects the first direction.

[0013] In this embodiment, by setting the projections of the first straight extension segment and the second straight extension segment in the second direction to at least partially overlap, it is beneficial to increase the length of the exhaust channel while improving the compactness of the exhaust channel distribution.

[0014] In some embodiments, the first straight extension is connected to the pressure relief mechanism, and the second straight extension is connected to the exhaust structure.

[0015] In this way, the high-temperature fluid generated by thermal runaway of the battery device can flow into the second straight extension section through the exhaust structure, and then flow through the bending section and the first straight extension section in sequence to the pressure relief mechanism, and be discharged through the pressure relief mechanism.

[0016] In some embodiments, the exhaust passage includes a third straight extension, a fourth straight extension, and a bent section, wherein the third straight extension extends along a first direction, the fourth straight extension extends along a second direction, and the bent section connects the third straight extension and the fourth straight extension.

[0017] In this embodiment, the length of the exhaust passage is increased by extending the third straight extension segment along the first direction, extending the fourth straight extension segment along the second direction, and connecting the third straight extension segment and the fourth straight extension segment with a bending segment.

[0018] In some embodiments, the third straight extension is connected to the pressure relief mechanism, and the fourth straight extension is connected to the exhaust structure.

[0019] In this way, the high-temperature fluid generated by thermal runaway of the battery device can flow into the fourth straight extension section through the exhaust structure, and then flow through the bending section and the third straight extension section in sequence to the pressure relief mechanism, and be discharged through the pressure relief mechanism.

[0020] In some embodiments, the housing assembly further includes a partition and a second receiving cavity, the partition dividing the housing assembly into a first receiving cavity and a second receiving cavity, the exhaust structure being disposed on the partition, and the exhaust passage being at least partially located in the second receiving cavity.

[0021] In this embodiment, the battery device is divided into a first receiving cavity and a second receiving cavity by setting a separator. The first receiving cavity can be used to arrange battery cell components and other high and low voltage components, while the second receiving cavity is used to arrange an exhaust channel for the discharge of thermal runaway flue gas. In this way, the flue gas in the second receiving cavity can be separated from the components in the first receiving cavity, and the flue gas can be separated from the high voltage.

[0022] In some embodiments, the second receiving cavity includes a first sub-cavity disposed on one side of the first receiving cavity along the third direction, the first sub-cavity including the bent section, the third direction being parallel to the height direction of the battery device.

[0023] In some embodiments, the dimension of the first sub-cavity in the third direction is greater than or equal to 5 mm and less than or equal to 30 mm.

[0024] In this embodiment, by setting the size of the first sub-cavity in the third direction to 5mm-30mm, the exhaust channel can have a certain exhaust volume, while also improving the exhaust efficiency of the exhaust channel.

[0025] In some embodiments, the second receiving cavity includes a second sub-cavity communicating with the first sub-cavity, the second sub-cavity being disposed on one side of the first sub-cavity along the third direction, and disposed on at least one side of the first receiving cavity along a second direction, the second direction intersecting the third direction.

[0026] In this embodiment, by configuring the second receiving cavity to include a first sub-cavity and a second sub-cavity, the high-temperature fluid generated by thermal runaway of the battery device can flow into the first sub-cavity and the second sub-cavity sequentially through the exhaust structure, and then be discharged through the pressure relief mechanism.

[0027] In some embodiments, the second sub-cavity includes the bent section.

[0028] Here, by setting the second sub-cavity to include a bent section, it is advantageous to further increase the length of the exhaust channel, thereby further reducing the temperature of the fluid discharged by the battery device due to thermal runaway.

[0029] In some embodiments, the pressure relief mechanism is disposed on at least one side of the second sub-cavity.

[0030] By placing the pressure relief mechanism on at least one side of the second sub-cavity, on the one hand, it facilitates the placement of the pressure relief mechanism and improves the structural compactness of the battery device; on the other hand, it also allows the fluid generated by thermal runaway of the battery device to be discharged from a predetermined direction, thereby reducing damage to the battery device.

[0031] In some embodiments, the housing assembly further includes a first wall and a protective plate, the first wall being used to support the battery cell, the venting structure being disposed on the first wall, and the venting channel being located between the protective plate and the first wall.

[0032] In this embodiment, the housing assembly is equipped with a protective plate, and the exhaust channel is located between the protective plate and the first wall. The first accommodating cavity can be used to arrange battery cell components and other high and low voltage components. The space between the protective plate and the first wall is used to arrange the exhaust channel for the discharge of thermal runaway flue gas. In this way, the flue gas in the exhaust channel can be separated from the components in the first accommodating cavity, and the flue gas can be separated from the high voltage.

[0033] In some embodiments, at least one rib is formed between the protective plate and the first wall, the rib separating the space between the protective plate and the first wall to form the exhaust channel.

[0034] In this embodiment, an exhaust channel is formed by creating a rib between the protective plate and the first wall, which is a simple structure.

[0035] In some embodiments, a portion of the protective plate protrudes to form the ribs.

[0036] In other words, the ribs are integrally formed from the protective plate, which helps to reduce the number of parts and improve assembly efficiency.

[0037] In some embodiments, a portion of the first wall protrudes to form the rib.

[0038] In other words, the ribs are integrally formed from the first wall, which helps to reduce the number of parts and improve assembly efficiency.

[0039] In some embodiments, the rib is in a sealing fit with the first wall and / or the protective plate.

[0040] In this embodiment, by sealing the ribs with the first wall and / or the protective plate, the sealing and reliability of the exhaust channel are improved, thereby improving the exhaust efficiency of the exhaust channel.

[0041] In some embodiments, the protective plate is disposed on one side of the first wall along the third direction, and a confluence area is formed between the protective plate and the first wall. The first receiving cavity is connected to the exhaust channel through the confluence area, and the third direction is parallel to the height direction of the battery device.

[0042] In this embodiment, by setting up a confluence area, the high-temperature fluid generated by thermal runaway of the battery device can first flow into the confluence area through the exhaust structure, and then flow into the exhaust channel through the confluence area. This helps to make the high-temperature fluid flow into the confluence area quickly, thereby minimizing the damage of the high-temperature fluid to other components of the battery device located in the first receiving cavity.

[0043] In some embodiments, at least a portion of the exhaust passage is located on the periphery of the confluence region.

[0044] In this embodiment, by setting at least part of the exhaust channel on the periphery of the confluence area, it is beneficial to allow the fluid in the confluence area to flow into the exhaust channel quickly, thereby reducing turbulence and improving exhaust efficiency. At the same time, it is also beneficial to increase the length of the exhaust channel.

[0045] In some embodiments, the housing assembly further includes an expansion beam that divides the first accommodating cavity into an electrical compartment and an energy compartment. The battery cell assembly is disposed in the energy compartment. The electrical compartment and the energy compartment are arranged along a second direction. The confluence area is disposed corresponding to the energy compartment. At least a portion of the exhaust channel is disposed on the side of the confluence area near the electrical compartment.

[0046] This facilitates the separation of battery cells from electrical components, reducing their mutual influence. It also allows the high-temperature fluid generated by the battery cells during thermal runaway to flow rapidly into the confluence area, improving exhaust efficiency. Furthermore, it helps to make full use of space, improve structural compactness, and increase the length of the exhaust channel, thereby reducing the temperature of the fluid discharged by the battery device due to thermal runaway.

[0047] In some embodiments, the second receiving cavity includes a second sub-cavity communicating with the first sub-cavity. The second sub-cavity is disposed on one side of the first sub-cavity along the third direction and on at least one side of the first receiving cavity along the second direction, which intersects with the third direction. The partition is provided with a communication port and a mounting hole communicating with both the second sub-cavity and the first sub-cavity. The second sub-cavity communicates with the first sub-cavity through the communication port, and the pressure relief mechanism is disposed at the mounting hole.

[0048] A second aspect of this disclosure provides an energy storage device, including the battery device described above.

[0049] A third aspect of this disclosure provides an electrical device, including the battery device or the energy storage device described above. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of the vehicle structure provided in some embodiments of this disclosure;

[0051] Figure 2 This is an exploded perspective view of a battery device provided in some embodiments of the present disclosure;

[0052] Figure 3 The diagram shows the structure of a protective plate provided in some embodiments of this disclosure, wherein continuous dashed lines with arrows indicate the direction of fluid flow;

[0053] Figure 4 Cross-sectional views of a battery device provided in some embodiments of this disclosure;

[0054] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0055] Figure 6 for Figure 4 Enlarged view of point B in the middle.

[0056] Explanation of reference numerals in the attached figures

[0057] 10. Battery cell assembly; 11. Battery cell; 20. Housing assembly; 21. Housing body; 211. First housing section; 212. Second housing section; 213. Mounting hole; 214. Connecting port; 22. Protective plate; 221. Rib; 23. First receiving cavity; 231. Energy chamber; 232. Electrical chamber; 24. Second receiving cavity; 241. First sub-cavity; 242. Second sub-cavity; 25. Exhaust structure; 26. Exhaust channel; 261. Bend section; 262. First straight extension section; 263. Second straight extension section; 264. Third straight extension section; 265. Fourth straight extension section; 27. Expansion beam; 28. First wall; 29. ​​Busbar area; 30. Pressure relief mechanism; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0058] Unless otherwise specified, all embodiments and optional embodiments of this disclosure can be combined to form new technical solutions.

[0059] Unless otherwise specified, all technical features and optional technical features of this disclosure can be combined to form new technical solutions.

[0060] With the development of clean energy, more and more devices are using electricity as their driving force, leading to the rapid development of power batteries, such as lithium-ion batteries, which can store a large amount of electrical energy and can be repeatedly charged and discharged. These power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0061] In this embodiment of the disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0062] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments disclosed herein are not limited to this.

[0063] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0064] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0065] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0066] In some implementations, the electrode assembly is a stacked structure.

[0067] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0068] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0069] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0070] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0071] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0072] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0073] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0074] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0075] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This disclosure does not impose any particular limitations.

[0076] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0077] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0078] In some embodiments, energy storage devices include energy storage containers, energy storage cabinets, etc.

[0079] In related technologies, during the thermal runaway of a battery device, high-temperature fluids may flow out of the battery device, which may damage the electrical device.

[0080] In view of this, in order to reduce the temperature of the fluid discharged by the battery device due to thermal runaway, this disclosure provides a battery device including a housing assembly, a battery cell assembly, and a pressure relief mechanism. The housing assembly has a first receiving cavity and a venting structure. The battery cell assembly is installed in the first receiving cavity. The pressure relief mechanism is disposed in the housing assembly. The housing assembly has a venting channel, and the pressure relief mechanism communicates with the venting channel. The first receiving cavity communicates with the venting channel via the venting structure, and the venting channel includes at least a bent section.

[0081] The battery device provided in this embodiment includes a housing assembly and a battery cell assembly. The housing assembly has a first receiving cavity, and the battery cell assembly is disposed within the first receiving cavity. The housing assembly protects the battery cell assembly. By forming an exhaust channel in the housing assembly, and having a pressure relief mechanism connected to the exhaust channel, and the first receiving cavity connected to the exhaust channel via an exhaust structure, the high-temperature fluid generated during thermal runaway of the battery device can flow into the exhaust channel through the exhaust structure and then be discharged through the exhaust channel. This helps to reduce the possibility of the high-temperature fluid damaging other components within the battery device. Furthermore, by including at least one bend in the exhaust channel, the length of the exhaust channel is increased, thereby cooling the high-temperature fluid generated during thermal runaway of the battery device. This reduces the temperature of the fluid discharged through the exhaust channel, decreasing the risk of combustion and open flame caused by the fluid coming into contact with oxygen.

[0082] The technical solutions described in this disclosure are applicable to electrical devices that use battery devices. The electrical devices include battery devices according to any embodiment of this disclosure, and the battery devices are used to provide electrical energy.

[0083] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This disclosure does not impose any special limitations on the above-mentioned electrical equipment.

[0084] It should be noted that the technical solutions described in this disclosure are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices that include battery devices. However, for the sake of brevity, the following embodiments are all described using electric vehicles as examples.

[0085] Please refer to Figure 1The vehicle 1000 may contain a controller 200, a motor 300, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 may 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, it can serve as the operating power source for the vehicle 1000's electrical system, such as meeting the power requirements for starting, navigation, and operation. In another embodiment of this disclosure, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0086] Please see Figure 2 To meet different power demands, the battery device 100 includes a battery cell assembly 10, which may include multiple battery cells 11. A battery cell 11 is the smallest unit that makes up a module or package of the battery device 100. Multiple battery cells 11 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 11 are connected in both series and parallel connections. Multiple battery cells 11 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 11 is housed within a housing assembly 20. Alternatively, the battery device 100 can also be composed of multiple battery cells 11 first connected in series, parallel, or in a mixed configuration to form a battery device 100 module, and then these modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed within the housing assembly 20. 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 11. Each battery cell 11 can be a secondary battery device 100 or a primary battery device 100; it can also be a lithium-sulfur battery device 100, a sodium-ion battery device 100, or a magnesium-ion battery device 100, but is not limited to these. The battery cell 11 can be cylindrical, flat, cuboid, or other shapes.

[0087] Please see Figures 2 to 6 This disclosure provides a battery device 100, which includes a housing assembly 20, a battery cell assembly 10, and a pressure relief mechanism 30. The housing assembly 20 has a first receiving cavity 23 and an exhaust structure 25. The battery cell assembly 10 is mounted in the first receiving cavity 23. The pressure relief mechanism 30 is disposed in the housing assembly 20. The housing assembly 20 has an exhaust channel 26, and the pressure relief mechanism 30 communicates with the exhaust channel 26. The first receiving cavity 23 is connected to the exhaust channel 26 via the exhaust structure 25. The exhaust channel 26 includes at least a bent section 261.

[0088] Please refer to Figure 2 The battery device 100 includes a housing assembly 20 and battery cells 11, with the battery cell assembly 10 disposed within the first receiving cavity 23 of the housing assembly 20.

[0089] The box assembly 20 can be a simple three-dimensional structure such as a cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of simple three-dimensional structures such as cuboids, cylinders, or spheres.

[0090] The housing assembly 20 is used to encapsulate the battery cell 11, and the housing assembly 20 can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cell 11.

[0091] For example, the enclosure assembly 20 is typically a cuboid structure, with both its length and width directions parallel to the horizontal plane. The length direction of the enclosure assembly 20 is parallel to the longest side of its cuboid structure. The height direction of the enclosure assembly 20 is perpendicular to the ground. For example, as... Figures 2 to 4 As shown, the width direction of the housing assembly 20 is the first direction, the length direction of the housing assembly 20 is the second direction, and the height direction of the housing assembly 20 is the third direction (i.e., the third direction is parallel to the height direction of the battery device 100).

[0092] In some embodiments, please refer to Figure 2 The box assembly 20 includes a box body 21, which includes a first box part 211 and a second box part 212. The first box part 211 and the second box part 212 surround and form a first receiving cavity 23.

[0093] As an example, a pressure relief mechanism 30 is provided on the housing assembly 20. The pressure relief mechanism 30 is used to release the internal gas of the housing assembly 20.

[0094] As an example, the housing assembly 20 is actuated to release internal pressure or temperature when the internal pressure or temperature reaches a predetermined threshold. When the internal pressure or temperature of the housing assembly 20 reaches the predetermined threshold, the pressure relief mechanism 30 actuates or a weak structure provided in the pressure relief mechanism 30 is destroyed, thereby forming an opening or channel for the release of internal pressure or temperature. This threshold design varies depending on design requirements. The threshold may depend on parameters such as the energy density of the battery device 100.

[0095] For example, the pressure relief mechanism 30 may be an explosion-proof valve.

[0096] Here, the exhaust structure 25 can be opened after braking, or the exhaust structure 25 can be a through hole that is directly connected to the exhaust passage 26.

[0097] As an example, the exhaust channel 26 connects to the outside of the battery device 100. High-temperature fluid generated during thermal runaway of the battery device 100 can flow into the exhaust channel 26 via the exhaust structure 25, and then be discharged to the outside of the battery device 100 via the exhaust channel 26. This separates the high-temperature fluid from the components inside the first receiving cavity 23, reducing the risk of damage to other normally functioning battery cells 11 caused by the high-temperature fluid. Furthermore, the exhaust channel 26 can also separate the high-temperature fluid from high-voltage components, which helps to reduce damage to the high-voltage components of the battery device 100, thereby mitigating insulation failure and even short-circuit arcing.

[0098] The exhaust passage 26 includes at least one bend 261, that is, the exhaust passage 26 extends in a bend.

[0099] For example, the exhaust passage 26 is a labyrinth exhaust passage 26.

[0100] Understandably, given a fixed amount of space, a curved exhaust passage 26 is longer than a straight exhaust passage 26.

[0101] By incorporating a bend 261, the length of the exhaust channel 26 can be increased within a given space, thus lengthening the fluid flow path. As the fluid flows through the exhaust channel 26, it will be cooled down. Therefore, the longer the exhaust channel 26 is, the lower the temperature of the fluid discharged through it.

[0102] Here, the number of bends 261 is not limited; there can be one or more bends 261.

[0103] In this disclosure, "multiple" refers to two or more items.

[0104] The battery device 100 provided in this embodiment includes a housing assembly 20 and a battery cell assembly 10. The housing assembly 20 has a first receiving cavity 23, and the battery cell assembly 10 is disposed within the first receiving cavity 23. The housing assembly 20 protects the battery cell assembly 10. By forming an exhaust channel 26 in the housing assembly 20, and communicating the pressure relief mechanism 30 with the exhaust channel 26, and communicating the first receiving cavity 23 with the exhaust channel 26 via an exhaust structure 25, the high-temperature fluid generated during thermal runaway of the battery device 100 can flow into the exhaust channel 26 through the exhaust structure 25 and then be discharged through the exhaust channel 26. This helps to reduce the possibility of the high-temperature fluid damaging other components inside the battery device 100. Furthermore, by setting the exhaust channel 26 to include at least a bent section 261, the length of the exhaust channel 26 is increased, thereby cooling the high-temperature fluid generated during thermal runaway of the battery device 100. This reduces the temperature of the fluid discharged through the exhaust channel 26, and reduces the possibility of the fluid discharged through the exhaust channel 26 igniting upon contact with oxygen and causing an open flame.

[0105] In some embodiments, please refer to Figure 3 The exhaust passage 26 includes a first straight extension section 262, a second straight extension section 263, and a bent section 261. The first straight extension section 262 and the second straight extension section 263 both extend along a first direction, and the bent section 261 connects the first straight extension section 262 and the second straight extension section 263.

[0106] Here, the number of the first straight line extension segment 262 and the second straight line extension segment 263 is not limited and can be set according to space and requirements.

[0107] The number of the first straight line extension segment 262 can be one or more.

[0108] The number of the second straight line extension segment 263 can be one or more.

[0109] Here, the first straight extension segment 262 and the second straight extension segment 263 both extend along the first direction, and the bent segment 261 connects the first straight extension segment 262 and the second straight extension segment 263. That is to say, the exhaust passage 26 defined between the first straight extension segment 262, the second straight extension segment 263 and the bent segment 261 is roughly "U" shaped.

[0110] In this embodiment, by extending both the first straight extension segment 262 and the second straight extension segment 263 along the first direction, and connecting the first straight extension segment 262 and the second straight extension segment 263 with the bent segment 261, the exhaust channel 26 is extended in a bent manner, thereby increasing the length of the exhaust channel 26.

[0111] In some embodiments, please refer to Figure 3 The projections of the first straight line extension segment 262 and the second straight line extension segment 263 in the second direction at least partially overlap.

[0112] Here, the projections of the first straight line extension segment 262 and the second straight line extension segment 263 in the second direction may overlap, or the projections of the first straight line extension segment 262 and the second straight line extension segment 263 in the second direction may completely overlap.

[0113] For example, the first straight line extension 262 and the second straight line extension 263 have the same dimensions in the first direction.

[0114] Of course, in other embodiments, the dimensions of the first straight extension segment 262 and the second straight extension segment 263 in the first direction may also be different.

[0115] For example, the first straight line extension segment 262 and the second straight line extension segment 263 are arranged in a second direction.

[0116] It is understandable that, given that the dimensions of the first straight extension segment 262 and the second straight extension segment 263 are fixed in the first direction, the greater the overlap of the projections of the first straight extension segment 262 and the second straight extension segment 263 in the second direction, the more space is saved.

[0117] In this embodiment, by setting the projections of the first straight extension segment 262 and the second straight extension segment 263 in the second direction to at least partially overlap, it is beneficial to increase the length of the exhaust channel 26 while improving the compactness of the exhaust channel 26 distribution.

[0118] In some embodiments, please continue reading Figure 3 The first straight extension section 262 is connected to the pressure relief mechanism 30, and the second straight extension section 263 is connected to the exhaust structure 25.

[0119] Thus, the high-temperature fluid generated by thermal runaway of the battery device 100 can flow into the second straight extension section 263 through the exhaust structure 25, and then flow through the bending section 261 and the first straight extension section 262 to the pressure relief mechanism 30, and be discharged through the pressure relief mechanism 30.

[0120] Here, the first straight extension section 262 and the pressure relief mechanism 30 can be directly connected, or they can be connected after passing through other flow channels.

[0121] Here, the second straight extension section 263 and the exhaust structure 25 can be directly connected, or they can be connected after passing through other flow channels.

[0122] In some embodiments, please continue reading Figure 3The exhaust passage 26 includes a third straight extension 264, a fourth straight extension 265 and a bent section 261. The third straight extension 264 extends along a first direction, the fourth straight extension 265 extends along a second direction, and the bent section 261 connects the third straight extension 264 and the fourth straight extension 265.

[0123] Here, the number of the third straight line extension segment 264 and the fourth straight line extension segment 265 is not limited and can be set according to space and requirements.

[0124] The number of the third straight line extension segment 264 can be one or more.

[0125] The number of the fourth straight line extension segment 265 can be one or more.

[0126] For example, the number of third straight extension segments 264 is one, the number of fourth straight extension segments 265 is two, and the number of bending segments 261 is also two.

[0127] Here, the third straight extension segment 264 extends along the first direction, the fourth straight extension segment 265 extends along the second direction, and the bending segment 261 connects the third straight extension segment 264 and the fourth straight extension segment 265. That is to say, the exhaust passage 26 defined between the third straight extension segment 264, the fourth straight extension segment 265 and the bending segment 261 is roughly "L" shaped.

[0128] In this embodiment, by extending the third straight extension segment 264 along the first direction, extending the fourth straight extension segment 265 along the second direction, and connecting the third straight extension segment 264 and the fourth straight extension segment 265 with the bending segment 261, the exhaust channel 26 is extended in a bent manner, thereby increasing the length of the exhaust channel 26.

[0129] In some embodiments, please continue reading Figure 3 The third straight extension section 264 is connected to the pressure relief mechanism 30, and the fourth straight extension section 265 is connected to the exhaust structure 25.

[0130] Thus, the high-temperature fluid generated by thermal runaway of the battery device 100 can flow into the fourth straight extension section 265 through the exhaust structure 25, and then flow through the bending section 261 and the third straight extension section 264 to the pressure relief mechanism 30, and be discharged through the pressure relief mechanism 30.

[0131] Here, the third straight extension section 264 and the pressure relief mechanism 30 can be directly connected, or they can be connected after passing through other flow channels.

[0132] Here, the fourth straight extension section 265 and the exhaust structure 25 can be directly connected, or they can be connected after passing through other flow channels.

[0133] In some embodiments, please refer to Figures 2 to 5 The housing assembly 20 also includes a partition and a second receiving cavity 24. The partition divides the housing assembly 20 into a first receiving cavity 23 and a second receiving cavity 24. An exhaust structure 25 is disposed on the partition, and an exhaust passage 26 is at least partially located in the second receiving cavity 24.

[0134] Here, the housing assembly 20 is divided into a first receiving cavity 23 and a second receiving cavity 24 by a separator, and the exhaust channel 26 is at least partially placed in the second receiving cavity 24. That is, the exhaust channel 26 can be separated from the first receiving cavity 23, which helps to reduce the possibility of high-temperature fluid damaging other components inside the battery device 100.

[0135] Here, the partition can be the cavity wall of the first receiving cavity 23 and / or the second receiving cavity 24.

[0136] By providing an exhaust structure 25 on the separator, the high-temperature fluid generated by thermal runaway of the battery device 100 can flow into the exhaust channel 26 through the exhaust structure 25.

[0137] In this embodiment, the battery device 100 is provided with a separator that divides the housing assembly 20 into a first receiving cavity 23 and a second receiving cavity 24. The first receiving cavity 23 can be used to arrange the battery cell assembly 10 and other high and low voltage components, while the second receiving cavity 24 is used to arrange the exhaust channel 26 for the discharge of thermal runaway flue gas. In this way, the flue gas in the second receiving cavity 24 can be separated from the components in the first receiving cavity 23, thereby achieving the separation of flue gas from high voltage.

[0138] In some embodiments, please refer to Figures 4 to 6 The second receiving cavity 24 includes a first sub-cavity 241, which is disposed on one side of the first receiving cavity 23 along a third direction. The first sub-cavity 241 includes a bent section 261.

[0139] Here, the third direction can be the height direction of the battery device 100.

[0140] The first sub-cavity 241 includes a bent segment 261, that is, the bent segment 261 is formed within the first sub-cavity 241.

[0141] In some embodiments, please refer to Figure 4 The dimension of the first sub-cavity 241 in the third direction is greater than or equal to 5 mm and less than or equal to 30 mm.

[0142] The dimension of the first sub-cavity 241 in the third direction can be any one of 5mm, 6mm, 8mm, 10mm, 12mm, 15mm, 18mm, 20mm, 23mm, 25mm, 27mm, 30mm, or any combination thereof.

[0143] The dimensions of the first sub-cavity 241 in the third direction are as follows: Figure 4 The H shown represents...

[0144] Here, the dimension of the first sub-cavity 241 in the third direction can be the dimension of the exhaust channel 26 in the third direction.

[0145] It is understandable that the larger the size of the first sub-cavity 241 in the third direction, the more beneficial it is to increase the exhaust volume of the exhaust channel 26, and the smaller the size of the first sub-cavity 241 in the third direction, the more beneficial it is to increase the exhaust efficiency of the exhaust channel 26.

[0146] In this embodiment, by setting the size of the first sub-cavity 241 in the third direction to 5mm-30mm, the exhaust channel 26 can have a certain exhaust volume, while also improving the exhaust efficiency of the exhaust channel 26.

[0147] In some embodiments, please refer to Figures 4 to 6 The second receiving cavity 24 includes a second sub-cavity 242 that communicates with the first sub-cavity 241. The second sub-cavity 242 is disposed on one side of the first sub-cavity 241 along a third direction and on at least one side of the first receiving cavity 23 along a second direction, the second direction intersecting the third direction.

[0148] Here, "intersection of the second direction and the third direction" means that the second direction and the third direction are not parallel.

[0149] For example, the second direction is perpendicular to the third direction.

[0150] In this embodiment, by configuring the second receiving cavity 24 to include a first sub-cavity 241 and a second sub-cavity 242, the high-temperature fluid generated by thermal runaway of the battery device 100 can flow into the first sub-cavity 241 and the second sub-cavity 242 sequentially through the exhaust structure 25, and then be discharged through the pressure relief mechanism 30.

[0151] In some embodiments, please refer to Figures 4 to 6 The second subcavity 242 includes a bent segment 261.

[0152] Here, by configuring the second sub-cavity 242 to include the bent section 261, it is advantageous to further increase the length of the exhaust passage 26, thereby further reducing the temperature of the fluid discharged by the battery device 100 due to thermal runaway.

[0153] In some embodiments, please refer to Figures 4 to 6 The pressure relief mechanism 30 is disposed on at least one side of the second sub-cavity 242.

[0154] It is understood that in some embodiments, it is not convenient to set the pressure relief mechanism 30 at the bottom of the battery device 100. Alternatively, in order to prevent the fluid generated by thermal runaway of the battery device 100 from being discharged from the bottom of the battery device 100, the pressure relief mechanism 30 is set at at least one side of the second sub-cavity 242. On the one hand, this facilitates the setting of the pressure relief mechanism 30 and improves the structural compactness of the battery device 100. On the other hand, it also allows the fluid generated by thermal runaway of the battery device 100 to be discharged from a predetermined direction, thereby reducing damage to the battery device 100.

[0155] In some embodiments, please continue reading Figures 4 to 6 The housing assembly 20 also includes a first wall 28 and a protective plate 22. The first wall 28 is used to support the battery cell 11. The exhaust structure 25 is disposed on the first wall 28, and the exhaust channel 26 is located between the protective plate 22 and the first wall 28.

[0156] For example, the first wall 28 may be the bottom wall of the housing assembly 20, that is, the first wall 28 is the bottom wall of the first receiving cavity 23.

[0157] For example, the protective plate 22 may be a bottom protective plate.

[0158] Here, the exhaust channel 26 is located between the protective plate 22 and the first wall 28, that is, the exhaust channel 26 is located on the outside of the box.

[0159] In this embodiment, the housing assembly 20 is provided with a protective plate 22, and the exhaust channel 26 is located between the protective plate 22 and the first wall 28. The first receiving cavity 23 can be used to arrange the battery cell assembly 10 and other high and low voltage components. The space between the protective plate 22 and the first wall 28 is used to arrange the exhaust channel 26 for the discharge of thermal runaway flue gas. In this way, the flue gas in the exhaust channel 26 can be separated from the components in the first receiving cavity 23, and the flue gas can be separated from the high voltage.

[0160] It should be noted that the specific way the exhaust channel 26 is formed is not limited here.

[0161] In some embodiments, please refer to Figures 2 to 3 At least one partition 221 is formed between the protective plate 22 and the first wall 28, and the partition 221 divides the space between the protective plate 22 and the first wall 28 to form an exhaust channel 26.

[0162] The specific number of diaphragm bars 221 is not limited here; there may be one or more diaphragm bars 221.

[0163] For example, at least one rib 221 is formed on the side of the protective plate 22 facing the first wall 28, or at least one rib 221 is formed on the side of the first wall 28 facing the protective plate 22.

[0164] In this embodiment, an exhaust channel 26 is formed by forming a rib 221 between the protective plate 22 and the first wall 28, which is a simple structure.

[0165] Of course, in other embodiments, the protective plate 22 and / or the first wall 28 may form a groove, and an exhaust channel 26 may be formed between the groove wall and the protective plate 22 and / or the first wall 28.

[0166] In some embodiments, please refer to Figures 2 to 3 A portion of the protective plate 22 protrudes to form a reinforcing rib 221.

[0167] In other words, the rib 221 is integrally formed from the protective plate 22, which helps to reduce the number of parts and improve assembly efficiency.

[0168] In some embodiments, a portion of the first wall 28 protrudes to form a rib 221.

[0169] In other words, the rib 221 is integrally formed from the first wall 28, which helps to reduce the number of parts and improve assembly efficiency.

[0170] Of course, in other embodiments, the rib 221 may also be installed on the protective plate 22.

[0171] Of course, in other embodiments, the rib 221 may also be installed on the first wall 28.

[0172] In some embodiments, please refer to Figures 4 to 5 The rib 221 is sealed to the first wall 28 and / or the protective plate 22.

[0173] For example, the rib 221 and the first wall 28 may be bonded together to improve the sealing and reliability of the exhaust passage 26.

[0174] For example, the rib 221 and the first wall 28 are provided with a seal to further improve the sealing of the exhaust passage 26.

[0175] For example, the rib 221 and the protective plate 22 may be bonded together to improve the sealing and reliability of the exhaust channel 26.

[0176] For example, the rib 221 and the protective plate 22 are provided with seals to further improve the sealing of the exhaust passage 26.

[0177] Of course, the rib 221 can also be in contact with the first wall 28 and / or the protective plate 22 without being connected by other means, which further improves the assembly efficiency.

[0178] In this embodiment, by sealing the rib 221 with the first wall 28 and / or the protective plate 22, the sealing performance and reliability of the exhaust channel 26 are improved, thereby improving the exhaust efficiency of the exhaust channel 26.

[0179] In some embodiments, please refer to Figures 2 to 4 The protective plate 22 is disposed on one side of the first wall 28 along the third direction. A confluence area 29 is also formed between the protective plate 22 and the first wall 28. The first receiving cavity 23 is connected to the exhaust channel 26 through the confluence area 29.

[0180] In other words, the high-temperature fluid generated by thermal runaway of the battery device 100 can first flow into the confluence region 29 through the exhaust structure 25, and then flow into the exhaust channel 26 through the confluence region 29.

[0181] For example, the confluence region 29 corresponds to all the exhaust structures 25, that is, the fluid discharged from all the exhaust structures 25 is discharged into the confluence region 29.

[0182] For example, the projections of all exhaust structures 25 in the third direction are all within the projection range of the confluence region 29 in the third direction.

[0183] In this embodiment, by setting up the confluence area 29, the high-temperature fluid generated by the thermal runaway of the battery device 100 can first flow into the confluence area 29 through the exhaust structure 25, and then flow into the exhaust channel 26 through the confluence area 29. This is beneficial to make the high-temperature fluid flow into the confluence area 29 quickly, thereby minimizing the damage of the high-temperature fluid to other components of the battery device 100 located in the first receiving cavity 23.

[0184] In some embodiments, please refer to Figure 3 At least part of the exhaust passage 26 is located around the confluence area 29.

[0185] For example, the exhaust passage 26 may be arranged around the periphery of the confluence region 29.

[0186] Here, "at least some exhaust passages 26 are located on the periphery of the confluence area 29" means that either some exhaust passages 26 are located on the periphery of the confluence area 29, or all exhaust passages 26 are located on the periphery of the confluence area 29.

[0187] In this embodiment, by setting at least a portion of the exhaust channel 26 on the periphery of the confluence region 29, it is beneficial for the fluid in the confluence region 29 to flow into the exhaust channel 26 quickly, thereby reducing turbulence and improving exhaust efficiency. At the same time, it is also beneficial to increase the length of the exhaust channel 26.

[0188] In some embodiments, please refer to Figure 4The housing assembly 20 also includes an expansion beam 27, which divides the first receiving cavity 23 into an electrical compartment 232 and an energy compartment 231. The battery cell assembly 10 is disposed in the energy compartment 231. The electrical compartment 232 and the energy compartment 231 are arranged along the second direction. The confluence area 29 is disposed corresponding to the energy compartment 231. At least part of the exhaust channel 26 is disposed on the side of the confluence area 29 near the electrical compartment 232.

[0189] For example, the electrical compartment 232 is used to house the high-voltage and / or low-voltage components of the battery device 100.

[0190] Here, by dividing the first receiving cavity 23 to form an electrical compartment 232 and an energy compartment 231, the battery cell 11 is separated from the electrical components, reducing their mutual influence.

[0191] Here, the flow junction area 29 is set to correspond to the energy storage 231, which allows the high-temperature fluid generated by the battery cell 11 in the energy storage 231 during thermal runaway to flow rapidly into the flow junction area 29.

[0192] At least a portion of the exhaust passage 26 is located on the side of the confluence area 29 near the electrical compartment 232, that is, at least a portion of the exhaust passage 26 is arranged along the second direction with the confluence area 29.

[0193] This facilitates the separation of the battery cell 11 from the electrical components, reducing their mutual influence. It also allows the high-temperature fluid generated by the battery cell 11 in the energy chamber 231 during thermal runaway to flow rapidly into the confluence area 29, improving exhaust efficiency. Furthermore, it helps to make full use of space, improve structural compactness, and increase the length of the exhaust channel 26, thereby reducing the temperature of the fluid discharged by the battery device 100 due to thermal runaway.

[0194] In one specific embodiment, please refer to Figures 2 to 6 The second receiving cavity 24 includes a second sub-cavity 242 communicating with the first sub-cavity 241. The second sub-cavity 242 is located on one side of the first sub-cavity 241 along a third direction and on at least one side of the first receiving cavity 23 along a second direction, which intersects with the third direction. The partition is provided with a communication port 214 and a mounting hole 213 communicating with both the second sub-cavity 242 and the first sub-cavity 241. The pressure relief mechanism 30 is located at the mounting hole 213.

[0195] Here, "the second sub-cavity 242 is disposed on at least one side of the first receiving cavity 23 along the second direction" means that the second sub-cavity 242 may be disposed on one side of the first receiving cavity 23 along the second direction, or it may be disposed on both sides of the first receiving cavity 23 along the second direction.

[0196] The number of pressure relief mechanisms 30 can be one or more.

[0197] In the description of this disclosure, references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the embodiments of this disclosure. In this disclosure, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine the different embodiments or examples described in this disclosure and the features of the different embodiments or examples without contradiction.

[0198] The above description is merely a preferred embodiment of this disclosure and is not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure are included within the scope of protection of this disclosure.

Claims

1. A battery device, characterized in that, include: The housing assembly forms a first receiving cavity and an exhaust structure; A battery cell assembly, wherein the battery cell assembly is installed in the first receiving cavity; A pressure relief mechanism is disposed on the housing assembly; The housing assembly forms an exhaust channel, the pressure relief mechanism is connected to the exhaust channel, the first receiving cavity is connected to the exhaust channel via the exhaust structure, and the exhaust channel includes at least a bent section.

2. The battery device according to claim 1, characterized by The exhaust passage includes a first straight extension section, a second straight extension section, and a bent section. The first straight extension section and the second straight extension section both extend along a first direction, and the bent section connects the first straight extension section and the second straight extension section.

3. The battery device of claim 2, wherein, The projections of the first straight line extension segment and the second straight line extension segment in the second direction at least partially overlap, and the second direction intersects the first direction.

4. The battery device of claim 2, wherein The first straight extension section is connected to the pressure relief mechanism, and the second straight extension section is connected to the exhaust structure.

5. The battery device of claim 2, wherein The exhaust passage includes a third straight extension section, a fourth straight extension section, and a bent section. The third straight extension section extends along a first direction, the fourth straight extension section extends along a second direction, and the bent section connects the third straight extension section and the fourth straight extension section.

6. The battery device of claim 5, wherein, The third straight extension section is connected to the pressure relief mechanism, and the fourth straight extension section is connected to the exhaust structure.

7. The battery device according to any one of claims 1 to 6, wherein The housing assembly further includes a partition and a second receiving cavity, the partition dividing the housing assembly into a first receiving cavity and a second receiving cavity, the exhaust structure being disposed on the partition, and the exhaust passage being at least partially located in the second receiving cavity.

8. The battery device according to claim 7, characterized in that, The second receiving cavity includes a first sub-cavity, which is disposed on one side of the first receiving cavity along a third direction. The first sub-cavity includes the bent section, and the third direction is parallel to the height direction of the battery device.

9. The battery device according to claim 8, characterized in that, The dimension of the first sub-cavity in the third direction is greater than or equal to 5 mm and less than or equal to 30 mm.

10. The battery device according to claim 8 or 9, characterized by The second receiving cavity includes a second sub-cavity communicating with the first sub-cavity. The second sub-cavity is disposed on one side of the first sub-cavity along the third direction and on at least one side of the first receiving cavity along the second direction, which intersects with the third direction.

11. The battery device according to claim 10, characterized in that, The second sub-cavity includes the bent section.

12. The battery device according to claim 10, characterized in that, The pressure relief mechanism is disposed on at least one side of the second sub-cavity.

13. The battery device according to any one of claims 1 to 6, characterized in that, The housing assembly also includes a first wall and a protective plate. The first wall is used to support the battery cell. The exhaust structure is disposed on the first wall, and the exhaust channel is located between the protective plate and the first wall.

14. The battery device according to claim 13, characterized in that, At least one partition rib is formed between the protective plate and the first wall, and the partition rib divides the space between the protective plate and the first wall to form the exhaust channel.

15. The battery device of claim 14, wherein, A portion of the protective plate protrudes to form the ribs; and / or A portion of the first wall protrudes to form the rib.

16. The battery device of claim 15, wherein, The rib is sealed to the first wall and / or the protective plate.

17. The battery device according to any one of claims 13 to 16, characterized in that, The protective plate is disposed on one side of the first wall along the third direction, and a confluence area is formed between the protective plate and the first wall. The first receiving cavity is connected to the exhaust channel through the confluence area, and the third direction is parallel to the height direction of the battery device.

18. The battery device of claim 17, wherein, At least a portion of the exhaust passage is located on the periphery of the confluence area.

19. The battery device according to claim 17 or 18, characterized by The housing assembly also includes an expansion beam that divides the first accommodating cavity into an electrical compartment and an energy compartment. The battery cell assembly is disposed in the energy compartment. The electrical compartment and the energy compartment are arranged along a second direction. The confluence area is disposed corresponding to the energy compartment. At least a portion of the exhaust channel is disposed on the side of the confluence area near the electrical compartment.

20. The battery device according to claim 8 or 9, characterized in that, The second receiving cavity includes a second sub-cavity communicating with the first sub-cavity. The second sub-cavity is located on one side of the first sub-cavity along the third direction and on at least one side of the first receiving cavity along the second direction, which intersects with the third direction. The partition is provided with a communication port and a mounting hole that communicate with both the second sub-cavities. The second sub-cavity communicates with the first sub-cavity through the communication port. The pressure relief mechanism is located at the mounting hole.

21. An energy storage device, comprising: Includes the battery pack according to any one of claims 1 to 20.

22. An electrical appliance, characterized in that, Includes the battery device according to any one of claims 1 to 20 or the energy storage device according to claim 21.

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