Battery device and electric device

Abstract

The embodiment of the invention provides a battery device and an electric device. The battery device comprises a box body assembly, a pressure relief structure and a plurality of battery monomers, the box body assembly is provided with a closed containing cavity and a first wall, and the first wall is provided with a mounting channel. The plurality of single batteries are arranged in the accommodating cavity; the pressure relief structure is arranged in the mounting channel in a sealed mode. The pressure relief structure is obliquely arranged in the thickness direction of the first wall. The pressure relief structure is arranged in the mounting channel, so that the grouping efficiency and the energy density of the battery device are improved. The space reserved between the single battery and the box body assembly due to avoiding of the pressure relief structure is reduced, so that the free air volume in the containing cavity is reduced, the problem that the battery device is on fire due to thermal runaway is solved, the harm caused by abnormal accidents is reduced, the inflation test time of the battery device in the production process can be shortened, and the production efficiency of the battery device is improved. Therefore, the production efficiency is improved, the production cost is reduced, and the condition that condensate water is generated in the battery device can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art

[0002] In electrical devices equipped with battery devices, the battery devices can be used to provide all or part of the power. During thermal runaway, high-temperature, high-pressure gas may be generated. Pressure relief structures are often used to quickly release this pressure in the event of thermal runaway. In related art, the installation of pressure relief structures occupies space within the battery device, thereby reducing the device's energy density. Summary of the Invention

[0003] In view of this, the embodiments of the present disclosure are intended to provide a battery device and an electrical device, which can improve the energy density of the battery device to a certain extent.

[0004] To this end, a first aspect of an embodiment of the present disclosure provides a battery device, including: A box assembly, wherein the box assembly is provided with a sealed accommodating cavity, the box assembly has a first wall, and the first wall has a mounting channel; a plurality of battery cells, wherein the plurality of battery cells are disposed in the accommodating cavity; A pressure relief structure is sealed and arranged in the installation channel, and is inclined along the thickness direction of the first wall.

[0005] The battery device provided by the embodiment of the present disclosure includes a box assembly, a pressure relief structure and a plurality of battery cells. The box assembly has a sealed accommodating cavity, and the plurality of battery cells are arranged in the accommodating cavity. The box assembly protects the battery cells. By sealing the pressure relief structure in the installation channel, on the one hand, the space of the first wall in the thickness direction can be fully utilized, thereby reducing the space inside and / or outside the box assembly occupied by the pressure relief structure after installation, thereby improving the grouping efficiency and energy density of the battery device. On the other hand, the space reserved between the battery cell and the box assembly to avoid the pressure relief structure can be reduced, thereby reducing the free air volume inside the accommodating cavity. This is conducive to improving the problem of fire caused by thermal runaway in the battery device and reducing the hazards caused by abnormal accidents. In addition, the inflation test time of the battery device during the production process can be shortened, thereby improving production efficiency and reducing production costs. In addition, the generation of condensed water inside the battery device can be reduced.

[0006] By arranging the pressure relief structure at an angle, it is advantageous to further reduce the space occupied by the pressure relief structure, thereby further improving the energy density of the battery device.

[0007] In some embodiments, the first wall has a first wall surface facing the accommodating cavity and a second wall surface facing away from the accommodating cavity, and the pressure relief structure is arranged to be inclined upward along the direction from the second wall surface to the first wall surface.

[0008] Here, by tilting the pressure relief structure upward along the direction from the second wall to the first wall, it is beneficial to further reduce the height occupied by the pressure relief structure, thereby further improving the grouping efficiency and energy density of the battery device, and further reducing the free air volume inside the accommodating cavity.

[0009] In some embodiments, a central axis of the pressure relief structure is perpendicular to a height direction of the battery device.

[0010] Here, by aligning the central axis of the pressure relief structure with the height direction of the battery device, the space occupied by the pressure relief structure in the thickness direction of the first wall can be reduced. On the premise of meeting the structural strength of the first wall, the thickness of the first wall can be reduced as much as possible, which is beneficial to further improve the structural compactness of the battery device and reduce manufacturing costs.

[0011] In some embodiments, the installation channel includes a first sub-channel and a second sub-channel that are connected to each other, the first sub-channel is connected to the accommodating cavity, and the second sub-channel is connected to the outside of the box assembly; Wherein, in a cross section perpendicular to the extension direction of the installation channel, the cross-sectional area of the first sub-channel is smaller than the cross-sectional area of the second sub-channel.

[0012] Here, on the cross-section perpendicular to the extension direction of the installation channel, by setting the cross-sectional area of the first sub-channel to be smaller than the cross-sectional area of the second sub-channel, while achieving the sealing fit between the pressure relief structure and the installation channel, it is also beneficial to the assembly of the pressure relief structure. In addition, the pressure relief structure can be quickly installed and disassembled from the outside of the box assembly, making installation and after-sales maintenance and replacement convenient.

[0013] In some embodiments, the first wall includes a stepped surface located at the junction of the first sub-channel and the second sub-channel; The pressure relief structure includes a first connecting section and a second connecting section connected to each other. The second connecting section has a first matching surface. At least a portion of the first connecting section extends into the first sub-channel. The first matching surface is sealed with the step surface.

[0014] In this embodiment, a step surface is formed on the first wall at the junction of the first sub-channel and the second sub-channel, and the second connecting section is provided with a first mating surface. The first mating surface is sealed with the step surface, which not only improves the sealing performance between the pressure relief structure and the first wall, but also facilitates the positioning of the pressure relief structure, thereby improving the assembly efficiency of the pressure relief structure.

[0015] In some embodiments, the first connecting section is threadedly connected to the first wall.

[0016] In this embodiment, the first connecting section is threadedly connected to the first wall. This simple and reliable connection structure enables rapid installation and removal of the pressure relief structure, facilitating installation and after-sales maintenance and replacement, and further improving the reliability of the pressure relief structure. Furthermore, no additional fasteners or other fixing parts are required, reducing costs. When the pressure relief structure is removed, it can be simply pulled out of the installation channel. When assembly is required, the pressure relief structure is inserted into the installation channel and then tightened, making both disassembly and assembly relatively convenient.

[0017] In some embodiments, the battery device includes a seal, which is sealingly sandwiched between the first mating surface and the step surface.

[0018] In this embodiment, by providing a sealing member and sealingly clamping the sealing member between the first mating surface and the step surface, the reliability of the pressure relief structure is improved.

[0019] In some embodiments, the lowest point of the first sub-channel close to one end of the accommodating cavity is higher than the top wall of the battery cell.

[0020] In this way, it is beneficial to improve the situation where the battery cell blocks the first sub-channel, thereby improving the pressure relief efficiency of the pressure relief structure.

[0021] In some embodiments, at least some of the battery cells are arranged along a first direction to form a battery pack, and the first wall is disposed on at least one side of the battery pack along the first direction; The battery cell includes a plurality of surfaces, wherein the plurality of surfaces includes a first surface, which is a surface with the largest area among the plurality of surfaces, wherein the first surface is perpendicular to the first direction.

[0022] Here, by arranging the first wall on at least one side of the battery pack along the first direction, the first wall can be used to constrain the battery pack in the first direction, thereby reducing the use of components such as expansion beams, reducing manufacturing costs and improving assembly efficiency. In addition, the first wall is thickened to increase its structural strength, thereby enabling the first wall to better resist the expansion force of the battery cells. Furthermore, the space in the thickness direction of the first wall can be fully utilized to arrange the pressure relief structure within the first wall, thereby reducing the space inside and / or outside the box assembly occupied by the pressure relief structure after installation, thereby improving the grouping efficiency and energy density of the battery device.

[0023] In some embodiments, the plurality of battery cells include a plurality of battery groups, each of the battery groups includes a plurality of battery cells arranged along a first direction, and each of the battery groups is arranged along a second direction, wherein the first direction intersects with the second direction and is perpendicular to a height direction of the battery device; The accommodating cavity includes a plurality of exhaust channels, the exhaust channels extend along the first direction, the pressure relief portions of the battery cells face the exhaust channels, and the pressure relief structures are in communication with the exhaust channels.

[0024] Here, by providing an exhaust channel, the gas ejected during thermal runaway of the battery cell can be discharged into the exhaust channel, where it can quickly reach the pressure relief structure and be discharged. This helps reduce the impact on other battery packs and improves exhaust efficiency. In addition, the provision of the exhaust channel can reduce the space within the battery device that can accommodate thermal runaway gas, thereby further improving exhaust efficiency.

[0025] In some embodiments, the box assembly includes a frame and a cover plate disposed on the frame, the cover plate and the frame are arranged to form the accommodating cavity, and the frame includes the first wall; The box assembly further includes a plurality of abutting portions, which are spaced apart along the second direction and each of which extends along the first direction. The abutting portions are disposed between the cover plate and the battery cell to enclose and form the exhaust channel.

[0026] Here, the box assembly is provided with a plurality of abutting portions, so that the abutting portions are arranged between the cover plate and the battery cell to enclose and form the exhaust passage, and the structure is simple.

[0027] In some embodiments, the cover plate protrudes toward the battery cell to form the abutting portion.

[0028] That is to say, the abutting portion and the cover plate are an integrated structure, which is beneficial to reducing parts, lowering costs and improving assembly efficiency.

[0029] In some embodiments, the abutting portion is connected to the battery cell.

[0030] Here, the battery cell and the cover plate can be formed into a whole, thereby improving the overall rigidity of the battery device, improving the deformation of the box assembly, and reducing the requirements for the structural strength of the box assembly. For example, the thickness of the bottom wall of the box assembly can be appropriately reduced, which is conducive to reducing manufacturing costs. In addition, the abutment portion can also be used to constrain the battery pack in the first direction and limit the expansion of the module toward both ends, that is, it can resist a certain expansion force and reduce the strength requirements of the first wall and other anti-expansion force structural parts. In addition, the abutment portion is connected to the battery cell to prevent the cover plate from convexing, thereby playing a role in limiting the deformation of the cover plate. In addition, it can also prevent the cover plate from convexing during the inflation test, thereby increasing the test time and affecting the test results.

[0031] In some embodiments, on a projection plane perpendicular to the height direction of the battery device, projections of at least a portion of the abutting portion overlap with the battery cells of two adjacent battery packs.

[0032] That is to say, at least part of the abutting portion abuts against the battery cells of the two battery packs at the same time, which is beneficial to further improve the overall structural strength of the battery device.

[0033] In some embodiments, the battery packs correspond to the exhaust channels in a one-to-one manner.

[0034] In other words, each battery pack corresponds to a vent channel, which can reduce the impact of thermal runaway on the battery cells of adjacent battery packs, thereby reducing the risk of thermal runaway spreading. In addition, the number of abutment portions can be relatively increased, thereby relatively improving the structural strength of the battery device.

[0035] In some embodiments, a dimension of the abutting portion along the first direction is greater than or equal to a dimension of the battery pack along the first direction.

[0036] In this way, the size of the exhaust channel along the first direction can be greater than or equal to the size of the battery pack along the first direction, so that the exhaust channel can better guide the gas and improve the exhaust efficiency.

[0037] In some embodiments, the exhaust channels are arranged at intervals, and the exhaust channels correspond to the pressure relief structures one by one.

[0038] This helps further reduce the impact of the exhaust duct on adjacent exhaust ducts, thereby reducing the impact of thermal runaway battery cells on adjacent battery cells. For example, if one or more battery cells in a battery pack experience thermal runaway, the gas ejected by the battery cells can quickly reach the pressure relief structure through the top exhaust duct and be discharged without affecting the battery cells in other battery packs. In addition, the path length of the thermal runaway gas out of the box assembly can be shortened, further improving exhaust efficiency.

[0039] In some embodiments, the accommodating chamber further includes a connecting channel, the multiple exhaust channels are connected to the connecting channel, and the pressure relief structure is connected to the connecting channel.

[0040] Here, when the energy of the battery device is not high or the exhaust requirements are not high, in order to save costs, one end of multiple exhaust channels can be connected through a connecting channel so that the gas in multiple exhaust channels can be exhausted through a pressure relief structure, thereby reducing the number of pressure relief structures, reducing manufacturing costs and improving assembly efficiency.

[0041] In some embodiments, the box assembly includes a frame and a cover plate provided on the frame, the cover plate and the frame enclosing and forming the accommodating cavity, the frame including a bottom plate, a first end plate, a second end plate, a first side plate, and a second side plate, the bottom plate and the cover plate being arranged opposite to each other along the height direction of the box assembly; The first end plate and the second end plate are arranged opposite to each other along a first direction, the first side plate and the second side plate are arranged opposite to each other along a second direction, and the first direction, the second direction and the height direction of the box assembly intersect each other. At least one of the first end plate and the second end plate constitutes the first wall, The battery cell is supported on the bottom plate, and the first end plate, the second end plate, the first side plate, and the second side plate are all in contact with the battery cell.

[0042] Since the first end plate, the second end plate, the first side plate, and the second side plate are all in contact with the battery cells, the overall grouping efficiency and volume energy density of the battery device can be greatly improved.

[0043] A second aspect of the embodiments of the present disclosure provides an electrical device including the battery device described above.

[0044] The battery device of the electrical device provided by the embodiment of the present disclosure includes a box assembly, a pressure relief structure and a plurality of battery cells. The box assembly has a accommodating cavity, and the plurality of battery cells are arranged in the accommodating cavity. The box assembly protects the battery cells. By arranging the pressure relief structure in the first wall, on the one hand, the space of the first wall in the thickness direction can be fully utilized, thereby reducing the space inside and / or outside the box assembly occupied by the pressure relief structure after installation, thereby improving the grouping efficiency and energy density of the battery device. On the other hand, the space reserved between the battery cell and the box assembly to avoid the pressure relief structure can be reduced, thereby reducing the free air volume inside the accommodating cavity. This is conducive to improving the problem of fire caused by thermal runaway of the battery device and reducing the hazards caused by abnormal accidents. In addition, the inflation test time of the battery device during the production process can be shortened, thereby improving production efficiency and reducing production costs. In addition, the generation of condensed water inside the battery device can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A schematic diagram of the structure of an electric device provided in some embodiments of the present disclosure; Figure 2 A schematic structural diagram of a battery device provided in some embodiments of the present disclosure; Figure 3 The battery device provided in some embodiments of the present disclosure omits the structural schematic diagram of the cover plate; Figure 4 A schematic structural diagram of a battery device provided in some other embodiments of the present disclosure; Figure 5 for Figure 4 A cross-sectional view of the battery device in the AA direction shown in FIG; Figure 6 for Figure 4 A cross-sectional view of the battery device along the BB direction shown in FIG; Figure 7 for Figure 5 Enlarged view of point C in the middle; Figure 8 A cross-sectional view of a battery device located at an exhaust channel according to some embodiments of the present disclosure; Figure 9 A cross-sectional view of a battery device located at an exhaust channel according to some other embodiments of the present disclosure; Figure 10 A schematic structural diagram of a pressure relief structure provided in some embodiments of the present disclosure; Figure 11 A schematic structural diagram of the cover plate provided in an embodiment of the present application.

[0046] Description of Reference Numerals 10. Battery pack; 11. Battery cell; 111. First surface; 20. Box assembly; 21. Frame; 211. First end plate; 212. Second end plate; 213. First side plate; 214. Second side plate; 215. Bottom plate; 22. Cover plate; 221. Abutment portion; 23. First wall; 231. First wall surface; 232. Second wall surface; 233. Mounting channel; 234. First sub-channel; 235. Second sub-channel; 236. Step surface; 30. Pressure relief structure; 31. First connecting section; 32. Second connecting section; 33. First mating surface; 40. Seal; 50. Exhaust channel; 60. Connecting channel; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. DETAILED DESCRIPTION

[0047] Unless otherwise specified, all embodiments and optional embodiments of the present disclosure can be combined with each other to form new technical solutions.

[0048] Unless otherwise specified, all technical features and optional technical features disclosed herein can be combined with each other to form a new technical solution.

[0049] With the development of clean energy, more and more devices are using electricity as a driving force. Consequently, power batteries, such as lithium-ion batteries, that can store large amounts of electricity and undergo multiple charge and discharge cycles are rapidly developing. These 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 vehicles, as well as in aerospace and other fields.

[0050] In the embodiment of the present disclosure, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0051] The battery cells may be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present disclosure.

[0052] A battery cell typically includes an electrode assembly. This assembly consists of a positive electrode, a negative electrode, and a separator, which is positioned between the positive and negative electrodes. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing the active ions to pass through.

[0053] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of wound and laminated structures.

[0054] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0055] In some embodiments, the electrode assembly is a laminate structure.

[0056] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0057] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0058] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0059] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0060] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0061] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0062] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0063] In some embodiments, a battery cell may include an outer shell. This outer shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film. In some embodiments, the outer shell may be sealed or non-sealed. For example, in a non-sealed outer shell, the outer shell protects the electrode assembly and includes a sealing bag between the outer shell and the electrode assembly, which encapsulates the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. In a sealed outer shell, the outer shell encapsulates the electrode assembly, electrolyte, and other components.

[0064] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in the present disclosure.

[0065] In some embodiments, the housing includes an end cap and a shell, wherein the shell has an opening and the end cap covers the opening. The shell may have one or more openings. One or more end caps may also be provided.

[0066] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via a current collecting member. The electrode terminal may be provided on an end cap or on the housing.

[0067] In some embodiments, the energy storage equipment includes an energy storage container, an energy storage cabinet, etc.

[0068] During thermal runaway of a battery device, high-temperature, high-pressure gas may be generated. A pressure relief structure is often provided to quickly release the pressure in the event of thermal runaway. In related art, the provision of a pressure relief structure occupies space in the battery device, thereby reducing the energy density of the battery device. For example, if part of the pressure relief structure extends into the accommodating cavity, a certain distance must be maintained between the pressure relief structure and the battery cell. This may result in a large gap between the inner wall of the housing assembly and the battery cell, leaving a large free volume inside the housing assembly. When thermal runaway occurs in the battery device, more flammable gas will remain inside the housing. Furthermore, during the production of the battery device, airtightness testing requires longer testing time, resulting in a longer production cycle. Furthermore, for example, if part of the pressure relief structure extends beyond the housing assembly, space must be reserved outside the housing assembly for the pressure relief structure to open, further reducing the overall assembly efficiency of the battery device.

[0069] In view of this, to improve the battery assembly efficiency and energy density, embodiments of the present disclosure provide a battery assembly comprising a housing assembly, a pressure relief structure, and a plurality of battery cells. The housing assembly comprises a sealed housing cavity having a first wall with a mounting channel. The plurality of battery cells are disposed within the housing cavity. The pressure relief structure is sealed within the mounting channel. The pressure relief structure is inclined along the thickness of the first wall.

[0070] The battery device provided by the embodiment of the present disclosure includes a box assembly, a pressure relief structure and a plurality of battery cells. The box assembly has a sealed accommodating cavity, and the plurality of battery cells are arranged in the accommodating cavity. The box assembly protects the battery cells. By sealing the pressure relief structure in the installation channel, on the one hand, the space of the first wall in the thickness direction can be fully utilized, thereby reducing the space inside and / or outside the box assembly occupied by the pressure relief structure after installation, thereby improving the grouping efficiency and energy density of the battery device. On the other hand, the space reserved between the battery cell and the box assembly to avoid the pressure relief structure can be reduced, thereby reducing the free air volume inside the accommodating cavity. This is conducive to improving the problem of fire caused by thermal runaway in the battery device and reducing the hazards caused by abnormal accidents. In addition, the inflation test time of the battery device during the production process can be shortened, thereby improving production efficiency and reducing production costs. In addition, the generation of condensed water inside the battery device can be reduced.

[0071] The technical solutions described in the embodiments of the present disclosure are applicable to an electrical device using a battery device. The electrical device includes the battery device of any embodiment of the present disclosure, and the battery device is used to provide electrical energy.

[0072] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present disclosure do not impose any special restrictions on the above-mentioned electrical devices.

[0073] It should be noted that the technical solutions described in the embodiments of the present disclosure are not limited to the battery devices described above, but can also be applied to all electrical devices and energy storage devices including battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as an example.

[0074] Please refer to Figure 1, a controller 200, a motor 300 and a battery device 100 may be provided inside the vehicle 1000, and the controller 200 is used to control the battery device 100 to power the motor 300. For example, the battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present disclosure, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but may also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0075] See also Figures 2 to 7 The present disclosure provides a battery device 100 including a housing assembly 20, a pressure relief structure 30, and a plurality of battery cells 11. The housing assembly 20 is provided with a sealed accommodating cavity having a first wall 23. The first wall 23 defines a mounting channel 233. The plurality of battery cells 11 are disposed within the accommodating cavity. The pressure relief structure 30 is sealed within the mounting channel 233.

[0076] The multiple mentioned in the embodiments of the present application refers to a number of two or more.

[0077] To meet varying power requirements, the battery device 100 includes multiple battery cells 11. A battery cell 11 is the smallest unit that makes up a battery module or battery pack. Multiple battery cells 11 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the multiple battery cells 11. Multiple battery cells 11 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire assembly of multiple battery cells 11 is housed within the housing assembly 20. Alternatively, the battery device 100 can be constructed by first connecting multiple battery cells 11 in series, in parallel, or in a hybrid configuration to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single unit housed within the housing assembly 20. The battery device 100 can also include other configurations. For example, the battery device 100 can include a busbar to electrically connect the multiple battery cells 11. Each battery cell 11 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cells 11 can be cylindrical, flat, rectangular, or other shapes.

[0078] The housing assembly 20 can be a simple three-dimensional structure such as a single rectangular parallelepiped, cylinder, or sphere, or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as rectangular parallelepiped, cylinder, or sphere. The housing assembly 20 can be made of an alloy material such as aluminum alloy or iron alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin.

[0079] The box assembly 20 is used to encapsulate the battery cells 11 . The box assembly 20 can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells 11 .

[0080] For example, the box assembly 20 is generally a rectangular parallelepiped structure, the length and width of the box assembly 20 are parallel to the horizontal plane, and the length of the box assembly 20 is parallel to the longest side of the rectangular parallelepiped structure of the box assembly 20. The height of the box assembly 20 is perpendicular to the ground.

[0081] The box assembly 20 may have various structural forms.

[0082] In some embodiments, the box assembly 20 may include a first box (cover plate 22 ) and a second box (frame 21 ), and the first box and the second box cover each other to define a receiving cavity for receiving the battery cell 11 .

[0083] For example, see Figure 2 and Figure 3 The first direction is represented by X, the second direction is represented by Y, and the height direction of the battery device 100 is represented by Z.

[0084] In order to improve the sealing performance after the first box body and the second box body are connected, a sealing member 40 may be provided between the first box body and the second box body, for example, a sealant, a sealing member 40 and the like.

[0085] Assuming that the first box body is covered on the top of the second box body, the first box body can also be called an upper box cover, and the second box body can also be called a lower box cover.

[0086] The box assembly 20 is used to accommodate the battery cells 11 . The box assembly 20 can have various structures, which are not specifically limited here.

[0087] Exemplarily, the first wall 23 may be a side wall, a top wall, or a bottom wall of the box assembly 20 .

[0088] The pressure relief structure 30 is sealed and disposed in the installation channel 233 , that is, the pressure relief structure 30 is disposed in the first wall 23 , and the pressure relief structure 30 is used to discharge the internal gas of the box assembly 20 .

[0089] For example, when the internal pressure or temperature of the box assembly 20 reaches a predetermined threshold, it is activated to release the internal pressure or temperature. When the internal pressure or temperature of the box assembly 20 reaches the predetermined threshold, the pressure relief structure 30 is activated or a weak structure provided in the pressure relief structure 30 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The design of this threshold varies depending on the design requirements. The threshold may depend on parameters such as the energy density of the battery device 100.

[0090] For example, the pressure relief structure 30 may be an explosion-proof valve.

[0091] As an example, when the high-temperature fluid generated when the battery device 100 undergoes thermal runaway causes the internal pressure or temperature of the box assembly 20 to reach a predetermined threshold, the pressure relief structure 30 executes an action to discharge the generated high-temperature fluid to the outside of the battery device 100. In this way, the situation in which the high-temperature fluid damages other normally used battery cells 11 can be improved.

[0092] Since the box assembly 20 is provided with a sealed accommodating cavity, a sealed space can be formed inside the box assembly 20, which can provide a stable environment for the components (such as the battery cell 11) located inside the box assembly 20 that is free from interference from the external environment. Therefore, the battery device 100 can be assembled in an electrical device or an energy storage device even if it is not further packaged like a battery module.

[0093] Here, by sealing the pressure relief structure 30 in the installation channel 233 , that is, the thickness of the first wall 23 can be fully utilized, the space of the box assembly 20 additionally occupied by the pressure relief structure 30 can be reduced, and the compactness of the battery device 100 can be improved.

[0094] Understandably, see Figure 7 By sealing the pressure relief structure 30 in the installation channel 233, the space reserved between the battery cell 11 and the box assembly 20 due to avoiding the pressure relief structure 30 can be reduced. As a result, the battery cell 11 can be assembled closely against the box assembly 20, which is conducive to reducing the space between the battery cell 11 and the box assembly 20, thereby reducing the free air volume inside the accommodating cavity.

[0095] The battery device 100 provided in an embodiment of the present disclosure includes a housing assembly 20, a pressure relief structure 30, and a plurality of battery cells 11. The housing assembly 20 has a receiving cavity within which the plurality of battery cells 11 are disposed, and the housing assembly 20 protects the battery cells 11. By disposing the pressure relief structure 30 within the first wall 23, the space in the thickness direction of the first wall 23 can be fully utilized, thereby reducing the space occupied by the pressure relief structure 30 inside and / or outside the housing assembly 20 after installation, thereby improving the battery packing efficiency and energy density of the battery device 100. Furthermore, the space reserved between the battery cells 11 and the housing assembly 20 to accommodate the pressure relief structure 30 can be reduced, thereby reducing the free air volume within the receiving cavity. This helps to alleviate the problem of fire caused by thermal runaway in the battery device 100 and reduces the hazards caused by abnormal accidents. Furthermore, it can shorten the inflation test time of the battery device 100 during the production process, thereby improving production efficiency and reducing production costs. Furthermore, it can also reduce the generation of condensation water within the battery device 100.

[0096] In some embodiments, see Figure 7 The pressure relief structure 30 is arranged obliquely along the thickness direction of the first wall 23 .

[0097] That is, the central axis of the pressure relief structure 30 is not parallel to the thickness direction of the first wall 23 .

[0098] Here, the thickness direction of the first wall 23 is the first direction.

[0099] It can be understood that, for pressure relief structures 30 of the same size, more space is required when the central axis of the pressure relief structure 30 is arranged parallel to the thickness direction of the first wall 23 than when it is arranged obliquely.

[0100] Here, by arranging the pressure relief structure 30 at an angle, it is advantageous to further reduce the space occupied by the pressure relief structure 30 , thereby further improving the energy density of the battery device 100 .

[0101] There are many ways to tilt the pressure relief structure 30 .

[0102] In some embodiments, see Figures 5 to 7 The first wall 23 has a first wall surface 231 facing the accommodating cavity and a second wall surface 232 facing away from the accommodating cavity. The pressure relief structure 30 is arranged to be tilted upward along the direction from the second wall surface 232 to the first wall surface 231.

[0103] That is, the first wall surface 231 is the inner surface of the first wall 23 , and the second wall surface 232 is the outer surface of the first wall 23 .

[0104] The direction from the second wall surface 232 to the first wall surface 231 is parallel to the thickness direction of the first wall 23 .

[0105] Along the direction from the second wall 232 to the first wall 231, the pressure relief structure 30 is tilted upward, that is, the air inlet of the pressure relief structure 30 faces the interior of the box assembly 20 and is tilted upward, and the air outlet of the pressure relief structure 30 faces the outside of the box assembly 20 and is tilted downward, thereby reducing the distance between the inner surface of the top wall of the box assembly 20 and the top wall of the battery cell 11. On the premise of ensuring normal exhaust of the pressure relief structure 30, it is beneficial to further reduce the height dimension occupied by the pressure relief structure 30.

[0106] Here, by tilting the pressure relief structure 30 upward along the direction from the second wall 232 to the first wall 231, it is beneficial to further reduce the height dimension occupied by the pressure relief structure 30, thereby further improving the grouping efficiency and energy density of the battery device 100, and can also further reduce the free air volume inside the accommodating cavity.

[0107] In some embodiments, the central axis of the pressure relief structure 30 is perpendicular to the height direction of the battery device 100 .

[0108] That is, when the height direction of the battery device 100 is parallel to the vertical direction, the central axis of the pressure relief structure 30 is parallel to the horizontal plane, so that the space occupied by the pressure relief structure 30 in the thickness direction of the first wall 23 can be reduced.

[0109] Here, by aligning the central axis of the pressure relief structure 30 with the height direction of the battery device 100, the space occupied by the pressure relief structure 30 in the thickness direction of the first wall 23 can be reduced. On the premise of meeting the structural strength of the first wall 23, the thickness of the first wall 23 can be reduced as much as possible, which is beneficial to further improve the structural compactness of the battery device 100 and reduce manufacturing costs.

[0110] In some embodiments, see Figure 7 , the end of the pressure relief structure 30 close to the accommodating cavity does not exceed the first wall 231.

[0111] That is to say, the end of the pressure relief structure 30 close to the accommodating cavity is flush with the first wall surface 231 , or has a certain gap with the first wall surface 231 .

[0112] That is to say, the pressure relief structure 30 does not extend into the accommodating cavity, so that the pressure relief structure 30 does not occupy space in the accommodating cavity.

[0113] In some embodiments, see Figure 7 , the end of the pressure relief structure 30 away from the accommodating cavity does not exceed the second wall 232.

[0114] That is to say, the end of the pressure relief structure 30 away from the accommodating cavity is flush with the second wall surface 232 , or has a certain gap with the second wall surface 232 .

[0115] That is to say, the pressure relief structure 30 does not extend out of the accommodating cavity, so that the pressure relief structure 30 can minimize the space occupied outside the accommodating cavity.

[0116] In some embodiments, see Figures 5 to 7 The mounting channel 233 includes a first sub-channel 234 and a second sub-channel 235. The first sub-channel 234 is connected to the accommodating cavity, and the second sub-channel 235 is connected to the outside of the box assembly 20. In a cross section perpendicular to the extending direction of the mounting channel 233, the cross-sectional area of the first sub-channel 234 is smaller than the cross-sectional area of the second sub-channel 235.

[0117] For example, along the thickness direction of the first wall 23 , the mounting channel 233 is also tilted, and the pressure relief structure 30 is disposed in the mounting channel 233 , so that the pressure relief structure 30 is tilted.

[0118] The installation channel 233 includes a first sub-channel 234 and a second sub-channel 235 that are connected to each other. The first sub-channel 234 is connected to the accommodating cavity, and the second sub-channel 235 is connected to the outside of the box assembly 20. In other words, along the direction from the inside of the box assembly 20 to the outside of the box assembly 20, the installation channel 233 includes the first sub-channel 234 and the second sub-channel 235 connected in sequence.

[0119] Exemplarily, the cross-sectional area of the second sub-channel 235 is larger than the external dimensions of the pressure relief structure 30 , which can facilitate the assembly of the pressure relief structure 30 and the movement of the starting switch of the pressure relief structure 30 when the pressure relief structure 30 is started, thereby improving the reliability of the pressure relief structure 30 .

[0120] The cross-sectional area of the first sub-channel 234 is smaller than the cross-sectional area of the second sub-channel 235 . This facilitates the sealing between the pressure relief structure 30 and the installation channel 233 and the assembly of the pressure relief structure 30 .

[0121] Here, on the cross-section perpendicular to the extension direction of the installation channel 233, by setting the cross-sectional area of the first sub-channel 234 to be smaller than the cross-sectional area of the second sub-channel 235, while achieving the sealing fit between the pressure relief structure 30 and the installation channel 233, it is also beneficial to the assembly of the pressure relief structure 30. In addition, the pressure relief structure 30 can be quickly installed and disassembled from the outside of the box assembly 20, making installation and after-sales maintenance and replacement convenient.

[0122] There are many ways to seal the pressure relief structure 30 in the installation channel 233 .

[0123] In some embodiments, see Figures 5 to 7 The first wall 23 includes a stepped surface 236 at the junction of the first sub-channel 234 and the second sub-channel 235. The pressure relief structure 30 includes a first connecting section 31 and a second connecting section 32 connected to each other. The second connecting section 32 has a first mating surface 33. At least a portion of the first connecting section 31 extends into the first sub-channel 234, and the first mating surface 33 is sealed with the stepped surface 236.

[0124] Exemplarily, the pressure relief structure 30 is substantially a columnar structure, and the mounting channel 233 is also substantially a columnar channel.

[0125] See also Figure 10 The pressure relief structure 30 includes a first connecting section 31 and a second connecting section 32 connected to each other. The first connecting section 31 is used to cooperate with the first sub-channel 234, and the second connecting section 32 is used to cooperate with the second sub-channel 235.

[0126] Exemplarily, in a cross section perpendicular to the extension direction of the mounting channel 233 , the cross-sectional dimension of the first connecting section 31 is smaller than the cross-sectional dimension of the second connecting section 32 .

[0127] Illustratively, there is a gap between the second connecting section 32 and the side wall of the second sub-channel 235, which facilitates the installation of the pressure relief structure 30 and is also beneficial for the starting switch of the pressure relief structure 30 to move within the second sub-channel 235, thereby improving the reliability of the pressure relief structure 30.

[0128] At least a portion of the first connecting section 31 extends into the first sub-channel 234 means that a portion of the first connecting section 31 extends into the first sub-channel 234 , or all of the first connecting section 31 extends into the first sub-channel 234 .

[0129] The air inlet of the pressure relief structure 30 is formed on the first connecting section 31 . At least a portion of the first connecting section 31 extends into the first sub-channel 234 . The air inlet of the pressure relief structure 30 is in communication with the first sub-channel 234 .

[0130] Here, the airflow in the accommodating chamber may enter the air inlet through the first sub-channel 234, or the airflow in the accommodating chamber may enter the air inlet directly, or part of the airflow in the accommodating chamber may enter the air inlet through the first sub-channel 234, and the other part of the airflow may enter the air inlet directly.

[0131] The air outlet of the pressure relief structure 30 is formed on the second connecting section 32, and the air outlet of the pressure relief structure 30 is selectively connected to the second sub-channel 235, that is, when the pressure relief structure 30 is in the closed state, the air outlet is not connected to the second sub-channel 235, and when the pressure relief structure 30 is in the open state, the air outlet is connected to the second sub-channel 235.

[0132] Here, the airflow in the accommodating cavity may be discharged to the outside of the box assembly 20 through the air outlet and the second sub-channel 235 in sequence, or the airflow may be discharged to the outside of the box assembly 20 directly through the air outlet, or part of the airflow in the accommodating cavity may be discharged to the outside of the box assembly 20 through the air outlet and the second sub-channel 235 in sequence, and the other part of the airflow may be discharged to the outside of the box assembly 20 directly through the air outlet.

[0133] Exemplarily, the first mating surface 33 faces the outside of the box assembly 20 .

[0134] Here, the first mating surface 33 and the step surface 236 can be in direct contact to achieve a sealed fit between the first mating surface 33 and the step surface 236, or the first mating surface 33 and the step surface 236 can be in no direct contact, and the sealed fit between the first mating surface 33 and the step surface 236 can be achieved through other components.

[0135] In this embodiment, a step surface 236 is formed on the first wall 23 at the junction of the first sub-channel 234 and the second sub-channel 235, and the second connecting section 32 is provided with a first mating surface 33. The first mating surface 33 is sealed with the step surface 236. While improving the sealing performance between the pressure relief structure 30 and the first wall 23, it also facilitates the positioning of the pressure relief structure 30, thereby improving the assembly efficiency of the pressure relief structure 30.

[0136] In some embodiments, see Figures 5 to 7 The first connecting section 31 is threadedly connected to the first wall 23 .

[0137] Exemplarily, the first connecting section 31 is provided with an external thread, and the side wall of the first sub-channel 234 is provided with an internal thread adapted to the external thread of the first connecting section 31 .

[0138] As the pressure relief structure 30 is screwed onto the first wall 23, the distance between the first mating surface 33 and the stepped surface 236 gradually decreases until the first mating surface 33 is sealed against the stepped surface 236. Because the threaded connection allows for continuous adjustment of the distance between the first mating surface 33 and the stepped surface 236, the threaded connection between the pressure relief structure 30 and the first wall 23 ensures a sealed fit between the first mating surface 33 and the stepped surface 236, eliminating any gaps between the first mating surface 33 and the stepped surface 236 and further improving the reliability of the pressure relief structure 30.

[0139] In this embodiment, the first connecting section 31 is threadedly connected to the first wall 23. This simple and reliable connection structure enables quick installation and removal of the pressure relief structure 30, facilitating installation and after-sales maintenance and replacement. This further improves the reliability of the pressure relief structure 30 and eliminates the need for additional fasteners or other fixing parts, reducing costs. To remove the pressure relief structure 30, simply pull it out of the mounting channel 233. To assemble, insert the pressure relief structure 30 into the mounting channel 233 and then tighten it, making both disassembly and assembly relatively convenient.

[0140] In some embodiments, please refer to Figures 5 to 7 The battery device 100 includes a sealing member 40 , which is sealingly sandwiched between the first mating surface 33 and the step surface 236 .

[0141] As the pressure relief structure 30 is screwed onto the first wall 23, the distance between the first mating surface 33 and the stepped surface 236 gradually decreases until the opposing ends of the seal 40 are clamped against the first mating surface 33 and the stepped surface 236. Because the threaded connection allows for continuous adjustment of the distance between the first mating surface 33 and the stepped surface 236, the threaded connection of the pressure relief structure 30 and the first wall 23, as well as the provision of the seal 40, ensures a sealed fit between the first mating surface 33 and the stepped surface 236, eliminating any gaps between the sealed fit between the first mating surface 33 and the stepped surface 236, further improving the reliability of the pressure relief structure 30.

[0142] In this embodiment, the sealing member 40 is provided and the sealing member 40 is sealingly clamped between the first mating surface 33 and the step surface 236 , which is beneficial to improving the reliability of the pressure relief structure 30 .

[0143] In some embodiments, see Figure 7 The lowest point of the first sub-channel 234 close to one end of the accommodating cavity is higher than the top wall of the battery cell 11.

[0144] It should be noted that the height of the top wall of the battery cell 11 does not include the height of components such as the pole and the pressure relief part that protrude from the outer shell, that is, the height corresponding to the top wall of the outer shell of the battery cell 11. In other words, the lowest point of the first sub-channel 234 near one end of the accommodating cavity is higher than the outer shell of the battery cell 11.

[0145] In this way, it is beneficial to improve the situation where the battery cell 11 blocks the first sub-channel 234 , thereby improving the pressure relief efficiency of the pressure relief structure 30 .

[0146] Illustratively, the plurality of battery cells 11 include a plurality of battery groups 10 , each battery group 10 includes a plurality of battery cells 11 arranged along a first direction, and each battery group 10 is arranged along a second direction. The first direction intersects with the second direction and is perpendicular to the height direction of the battery device 100 .

[0147] The first direction intersects the second direction, that is, the first direction is not parallel to the second direction. Exemplarily, the first direction is perpendicular to the second direction, that is, the first direction and the second direction are perpendicular to the height direction of the battery device 100 .

[0148] That is, the plurality of battery cells 11 are arranged in rows and columns.

[0149] In some embodiments, see Figure 3 and Figure 6 At least some of the battery cells 11 are arranged along a first direction to form a battery pack 10. The first wall 23 is disposed on at least one side of the battery pack 10 along the first direction. The battery cells 11 include multiple surfaces, including a first surface 111, which is the largest surface among the multiple surfaces. The first surface 111 is perpendicular to the first direction.

[0150] It should be noted that the first surface 111 described in the embodiment of the present application is the large surface of the battery cell 11 , which is the surface with the largest area among the multiple surfaces of the battery cell 11 .

[0151] Taking the square battery cell 11 as an example, in the vertical state, the surface formed by the length and width directions of the battery cell 11 is the bottom surface of the battery cell 11, the surface formed by the length and height directions of the battery cell 11 is the large surface of the battery cell 11, and the surface formed by the width and height directions of the battery cell 11 is the side surface of the battery cell 11.

[0152] The first wall 23 is disposed on at least one side of the battery pack 10 along the first direction, which means that the first wall 23 may be disposed on one side of the battery pack 10 along the first direction, or the first wall 23 may be disposed on both sides of the battery pack 10 along the first direction.

[0153] In some embodiments, see Figure 3 and Figure 7 The battery cells 11 at the ends of the battery pack 10 along the first direction may abut against the first wall 23. The first wall 23 may be used to constrain the battery pack 10 in the first direction and at least to withstand the expansion force of the battery cells 11. The expansion force here specifically refers to the force applied to the box assembly 20 due to the expansion and deformation of the battery cells 11. As an example, the first wall 23 mainly withstands the expansion force along the first direction.

[0154] Since the expansion force of the battery cell 11 at the first surface 111 is relatively large, by setting the first surface 111 perpendicular to the first direction, the first wall 23 is used to constrain the battery pack 10 in the first direction, which is beneficial to improving the reliability of the battery device 100.

[0155] Here, by arranging the first wall 23 on at least one side of the battery pack 10 along the first direction, the first wall 23 can be used to constrain the battery pack 10 in the first direction, thereby reducing the use of components such as expansion beams, reducing manufacturing costs and improving assembly efficiency. In addition, the first wall 23 is thickened to improve the structural strength of the first wall 23, so that the first wall 23 can better resist the expansion force of the battery cell 11. Furthermore, the space in the thickness direction of the first wall 23 can be fully utilized to arrange the pressure relief structure 30 within the first wall 23, thereby reducing the space inside and / or outside the box assembly 20 occupied by the pressure relief structure 30 after installation, thereby improving the grouping efficiency and energy density of the battery device 100.

[0156] In some embodiments, see Figures 6 to 9 The accommodating cavity includes a plurality of exhaust channels 50 , the exhaust channels 50 extend along a first direction, the pressure relief portion of the battery cell 11 faces the exhaust channels 50 , and the pressure relief structure 30 is in communication with the exhaust channels 50 .

[0157] The pressure relief portion of the battery cell 11 faces the exhaust passage 50 , that is, the airflow in the battery cell 11 can be discharged into the exhaust passage 50 .

[0158] Here, by providing the exhaust duct 50, the gas ejected from the battery cell 11 during thermal runaway can be discharged into the exhaust duct 50, where it can quickly reach the pressure relief structure 30 and be discharged. This helps reduce the impact on other battery packs 10 and improves exhaust efficiency. In addition, the provision of the exhaust duct 50 can reduce the space within the battery device 100 that can accommodate thermal runaway gas, thereby further improving exhaust efficiency.

[0159] In some embodiments, see Figures 6 to 9 The box assembly 20 includes a frame 21 and a cover plate 22 disposed on the frame 21. The cover plate 22 and the frame 21 enclose a receiving cavity. The frame 21 includes a first wall 23. The box assembly 20 also includes a plurality of abutting portions 221 spaced apart along the second direction. Each abutting portion 221 extends along the first direction. The abutting portions 221 are disposed between the cover plate 22 and the battery cell 11 to enclose and form an exhaust passage 50.

[0160] That is, the abutting portion 221 , the cover plate 22 and the battery cell 11 together define the exhaust passage 50 .

[0161] Exemplarily, there are a plurality of abutting portions 221 , and the abutting portions 221 are spaced apart along the second direction to form a plurality of exhaust passages 50 spaced apart along the second direction, enclosed with the cover plate 22 and the battery cells 11 .

[0162] Illustratively, in the second direction, a pressure relief portion of at least one battery cell 11 is provided between two adjacent abutting portions 221 .

[0163] Here, the box assembly 20 is provided with a plurality of abutting portions 221 , so that the abutting portions 221 are disposed between the cover plate 22 and the battery cell 11 to enclose and form the exhaust passage 50 . This structure is simple.

[0164] In some embodiments, see Figure 11 The cover plate 22 protrudes toward the battery cell 11 to form an abutting portion 221 .

[0165] Here, the cover plate 22 may be partially thickened, i.e., the thickened area protrudes toward the battery cell 11 to form the abutment portion 221. In other words, the wall thickness of the cover plate 22 in the area located at the abutment portion 221 is greater than the wall thickness of other areas of the cover plate 22. The cover plate 22 may be formed using a plastic sheet through a vacuum forming process, a plastic injection molding process, or a composite material through a compression molding process.

[0166] Alternatively, the side of the cover plate 22 facing away from the battery cell 11 may be recessed so that the cover plate 22 protrudes toward the battery cell 11 to form an abutment portion 221. In other words, the wall thickness of the cover plate 22 in the area located at the abutment portion 221 is equal to the wall thickness of other areas of the cover plate 22. The cover plate 22 may be formed using a plastic sheet by a vacuum forming process, a plastic injection molding process, a composite material by a molding process, or a metal sheet by a stamping process.

[0167] For example, the cover plate 22 may be a flat plate structure, or may be an inverted basin or other structural forms.

[0168] That is to say, the abutting portion 221 and the cover plate 22 are an integrated structure, which is beneficial to reducing parts, lowering costs and improving assembly efficiency.

[0169] Of course, in other embodiments, the abutting portion 221 and the cover plate 22 may also be a split structure, and the abutting portion 221 may be connected to the cover plate 22 .

[0170] In some embodiments, see Figure 6 , the contact portion 221 is connected to the battery cell 11 .

[0171] Exemplarily, the abutting portion 221 is connected to all the battery cells 11 of at least one battery pack 10 .

[0172] Exemplarily, the abutting portion 221 is adhesively connected to the battery cell 11 .

[0173] Illustratively, the abutting portion 221 is connected to a shoulder of the battery cell 11 .

[0174] Here, by connecting the abutment portion 221 to the battery cell 11, the battery cell 11 and the cover plate 22 can be formed into a whole, thereby improving the overall rigidity of the battery device 100, improving the deformation of the box assembly 20, and reducing the structural strength requirements of the box assembly 20. For example, the thickness of the bottom wall of the box assembly 20 can be appropriately reduced, which is conducive to reducing manufacturing costs. In addition, the abutment portion 221 can also be used to constrain the battery pack 10 in the first direction and limit the expansion of the module toward both ends, that is, it can resist a certain expansion force and reduce the strength requirements of the first wall 23 and other anti-expansion force structural parts. In addition, the connection of the abutment portion 221 to the battery cell 11 can prevent the cover plate 22 from bulging upward, thereby playing a role in limiting the deformation of the cover plate 22. In addition, it can also prevent the cover plate 22 from bulging upward during the inflation test, thereby increasing the test time and affecting the test results.

[0175] Exemplarily, the battery cell 11 is bonded to the bottom wall of the box assembly 20 .

[0176] In some embodiments, see Figure 6 On a projection plane perpendicular to the height direction of the battery device 100 , at least a portion of the projection of the abutting portion 221 overlaps with the battery cells 11 of two adjacent battery packs 10 .

[0177] That is, at least part of the abutting portion 221 abuts against the battery cells 11 of the two battery packs 10 at the same time, which is beneficial for further improving the overall structural strength of the battery device 100 .

[0178] Here, the projection of part of the abutting portion 221 may overlap with the battery cells 11 of two adjacent battery packs 10 , or the projection of all the abutting portion 221 may overlap with the battery cells 11 of two adjacent battery packs 10 .

[0179] In some embodiments, see Figure 6 and Figure 8 , the battery pack 10 corresponds to the exhaust channel 50 one by one.

[0180] In other words, each battery pack 10 corresponds to a vent channel 50. This reduces the impact of thermal runaway on the battery cells 11 of adjacent battery packs 10 when a battery cell 11 of a single battery pack 10 experiences thermal runaway, thereby reducing the risk of thermal runaway spreading. Furthermore, the number of abutment portions 221 can be relatively increased, thereby relatively improving the structural strength of the battery device 100.

[0181] Of course, in other embodiments, at least part of the exhaust channels 50 may correspond to multiple battery packs 10 .

[0182] In some embodiments, see Figure 8 and Figure 11 , the dimension of the abutting portion 221 along the first direction is greater than or equal to the dimension of the battery pack 10 along the first direction.

[0183] In this way, the size of the exhaust channel 50 along the first direction can be greater than or equal to the size of the battery pack 10 along the first direction, so that the exhaust channel 50 can better guide the gas and improve the exhaust efficiency.

[0184] In some embodiments, see Figure 6 and Figure 8 The exhaust channels 50 are arranged at intervals, and the exhaust channels 50 correspond to the pressure relief structures 30 one by one.

[0185] That is, each exhaust channel 50 corresponds to a pressure relief structure 30 .

[0186] Here, the exhaust passages 50 are spaced apart from each other, that is, the exhaust passages 50 are not connected to each other.

[0187] Exemplarily, both ends of the abutting portion 221 abut against the side walls of the box assembly 20 so that adjacent exhaust passages 50 are not connected to each other.

[0188] This helps further reduce the impact of the exhaust duct 50 on adjacent exhaust ducts 50, thereby reducing the impact of thermal runaway of battery cells 11 in a battery pack 10 on the battery cells 11 of adjacent battery packs 10. For example, when thermal runaway occurs in one or more battery cells 11 in a battery pack 10, the gas ejected by the battery cells 11 can quickly reach the pressure relief structure 30 through the top exhaust duct 50 and be discharged without affecting the battery cells 11 of other battery packs 10. In addition, the path length of the thermal runaway gas to exit the box assembly 20 can be shortened, further improving exhaust efficiency.

[0189] Of course, in other embodiments, at least part of the pressure relief structures 30 may correspond to multiple exhaust channels 50 .

[0190] In some embodiments, see Figure 6 and Figure 9 The accommodating chamber further includes a connecting channel 60 , multiple exhaust channels 50 are connected to the connecting channel 60 , and the pressure relief structure 30 is connected to the connecting channel 60 .

[0191] That is, one pressure relief structure 30 may correspond to multiple exhaust channels 50 , and the pressure relief structure 30 may be connected to the multiple exhaust channels 50 through the connecting channel 60 .

[0192] Of course, part of the pressure relief structure 30 may correspond to one exhaust channel 50 , and another part of the pressure relief structure 30 may correspond to multiple exhaust channels 50 .

[0193] Exemplarily, one end of the abutment portion 221 can abut against the side wall of the box assembly 20, and the other end can have a gap with the side wall of the box assembly 20, so that at least part of the exhaust channel 50 is connected through the gap, that is, the gap between the end of the abutment portion 221 and the side wall of the box assembly 20 forms a connecting channel 60.

[0194] Here, when the energy of the battery device 100 is not high or the exhaust requirements are not high, in order to save costs, one end of multiple exhaust channels 50 can be connected through a connecting channel 60, so that the gas in multiple exhaust channels 50 can be exhausted through a pressure relief structure 30, thereby reducing the number of pressure relief structures 30, reducing manufacturing costs and improving assembly efficiency.

[0195] In some embodiments, see Figures 2 to 5 The box assembly 20 includes a frame 21 and a cover plate 22 covering the frame 21. The cover plate 22 and the frame 21 are surrounded by a accommodating cavity. The frame 21 includes a bottom plate 215, a first end plate 211, a second end plate 212, a first side plate 213 and a second side plate 214. The bottom plate 215 and the cover plate are arranged opposite to each other along the height direction of the box assembly 20. The first end plate 211 and the second end plate 212 are arranged opposite to each other along the first direction, and the first side plate and the second side plate are arranged opposite to each other along the second direction. The first direction, the second direction and the height direction of the box assembly 20 intersect with each other. At least one of the first end plate 211 and the second end plate 212 constitutes a first wall 23. The battery cell 11 is supported on the bottom plate 215. The first end plate 211, the second end plate 212, the first side plate 213 and the second side plate 214 are all in contact with the battery cell 11.

[0196] For example, the battery cells 11 in the same battery pack 10 are arranged with their first surfaces 111 facing each other. For example, the battery cells 11 in the same battery pack 10 are arranged along a first direction, and the first surface 111 of each battery cell 11 in the same battery pack 10 is substantially perpendicular to the first direction. The first surface 111 of the battery cell 11 refers to the surface with the largest area among the multiple surfaces of the battery cell 11.

[0197] Illustratively, the battery cell 11 includes a housing and an electrode assembly located within the housing.

[0198] Illustratively, the electrode assembly is a laminate structure, and the positive electrode, the negative electrode, and the separator in the electrode assembly are arranged along a first direction.

[0199] Illustratively, the electrode assembly is a wound structure, the electrode assembly has a straight region and a corner region, and the positive electrode, the negative electrode, and the separator located in the straight region are arranged along a first direction.

[0200] Exemplarily, the expansion of the battery cell 11 along the direction in which the positive electrode, the negative electrode, and the separator are arranged is greater than the expansion of the battery cell 11 along a direction intersecting the direction in which the positive electrode, the negative electrode, and the separator are arranged. For example, the expansion of the battery cell 11 along a first direction is greater than the expansion of the battery cell 11 along a second direction, and the expansion of the battery cell 11 along the first direction is greater than the expansion of the battery cell 11 along the height direction of the box assembly 20.

[0201] Exemplarily, along the first direction, one side of the first end plate 211 and / or the second end plate 212 has a reinforcing rib, thereby increasing the strength of the first end plate 211 and / or the second end plate 212 .

[0202] Illustratively, along the first direction, the first end plate 211 and / or the second end plate 212 have reinforcing ribs on the side facing away from the accommodating cavity, thereby not only strengthening the strength of the first end plate 211 and / or the second end plate 212, but also avoiding occupying space in the battery box.

[0203] Exemplarily, there are multiple reinforcing ribs, and the multiple reinforcing ribs are cross-arranged.

[0204] Exemplarily, the first end plate 211 and / or the second end plate 212 are made of metal.

[0205] Exemplarily, the first end plate 211 and / or the second end plate 212 can be equivalent to an expansion beam, which is used to resist the expansion force of the battery cell 11 along the first direction by arranging the two ends of the battery cell 11 in the same battery pack 10 along the arrangement direction between the first end plate 211 and the second end plate 212.

[0206] The first surface 111 in the battery cell 11 is more likely to be deformed due to the charging and / or discharging of the battery cell 11. Therefore, by arranging the first end plate 211 and the second end plate 212 relative to each other along the first direction and perpendicular to the first direction, the first end plate 211 and the second end plate 212 can be used to resist the expansion force of the battery cell 11 along the first direction, thereby reducing the probability or degree of deformation of the first surface 111 caused by the increase in pressure inside the battery cell 11 due to the charging and / or discharging of the battery cell 11, thereby reducing the probability of deformation of the battery device 100 or reducing the degree of deformation of the battery device 100.

[0207] Since the first end plate 211 , the second end plate 212 , the first side plate 213 , and the second side plate 214 are all in contact with the battery cells 11 , the overall assembly efficiency and volume energy density of the battery device 100 can be greatly improved.

[0208] Exemplarily, the bottom plate 215 has a heat exchange medium flow channel built in.

[0209] Therefore, the bottom plate 215 has the functions of supporting the battery cells 11 and performing thermal management, which is beneficial to reducing the number of components, reducing the weight of the battery device 100, and further improving the energy density of the battery device 100.

[0210] In the description of the present disclosure, the descriptions with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present disclosure. In the present disclosure, the schematic representations 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 a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine different embodiments or examples described in the present disclosure and features of different embodiments or examples, unless they are mutually inconsistent.

[0211] The foregoing description is merely a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present disclosure are intended to be within the scope of protection of the present disclosure.

Claims

1. A battery device, characterized in that: include: A box assembly, wherein the box assembly is provided with a sealed accommodating cavity, the box assembly has a first wall, and the first wall has a mounting channel; a plurality of battery cells, wherein the plurality of battery cells are disposed in the accommodating cavity; A pressure relief structure is sealed and arranged in the installation channel, and is inclined along the thickness direction of the first wall.

2. The battery device according to claim 1, wherein: The first wall has a first wall surface facing the accommodating cavity and a second wall surface facing away from the accommodating cavity. The pressure relief structure is arranged to be inclined upward along the direction from the second wall surface to the first wall surface.

3. The battery device according to claim 1, wherein: The central axis of the pressure relief structure is perpendicular to the height direction of the battery device.

4. The battery device according to any one of claims 1 to 3, characterized in that: The installation channel includes a first sub-channel and a second sub-channel that are connected to each other, the first sub-channel is connected to the accommodating cavity, and the second sub-channel is connected to the outside of the box assembly; Wherein, in a cross section perpendicular to the extension direction of the installation channel, the cross-sectional area of the first sub-channel is smaller than the cross-sectional area of the second sub-channel.

5. The battery device according to claim 4, characterized in that The first wall includes a stepped surface located at the junction of the first sub-channel and the second sub-channel; The pressure relief structure includes a first connecting section and a second connecting section connected to each other. The second connecting section has a first matching surface. At least a portion of the first connecting section extends into the first sub-channel. The first matching surface is sealed with the step surface.

6. The battery device according to claim 5, characterized in that The first connecting section is threadedly connected to the first wall.

7. The battery device according to claim 5, characterized in that The battery device includes a seal member, which is sealingly sandwiched between the first mating surface and the step surface.

8. The battery device according to claim 4, wherein: The lowest point of the first sub-channel close to one end of the accommodating cavity is higher than the top wall of the battery cell.

9. The battery device according to any one of claims 1 to 3, characterized in that: At least some of the battery cells are arranged along a first direction to form a battery pack, and the first wall is provided on at least one side of the battery pack along the first direction; The battery cell includes a plurality of surfaces, wherein the plurality of surfaces includes a first surface, which is a surface with the largest area among the plurality of surfaces, wherein the first surface is perpendicular to the first direction.

10. The battery device according to any one of claims 1 to 3, characterized in that: The plurality of battery cells include a plurality of battery groups, each of the battery groups includes a plurality of battery cells arranged along a first direction, and each of the battery groups is arranged along a second direction, the first direction intersecting with the second direction and both being perpendicular to a height direction of the battery device; The accommodating cavity includes a plurality of exhaust channels, the exhaust channels extend along the first direction, the pressure relief portions of the battery cells face the exhaust channels, and the pressure relief structures are in communication with the exhaust channels.

11. The battery device according to claim 10, characterized in that The box assembly includes a frame and a cover plate provided on the frame, the cover plate and the frame are arranged to form the accommodating cavity, and the frame includes the first wall; The box assembly further includes a plurality of abutting portions, which are spaced apart along the second direction and each of which extends along the first direction. The abutting portions are disposed between the cover plate and the battery cell to enclose and form the exhaust channel.

12. The battery device according to claim 11, wherein: The cover plate protrudes toward the battery cell to form the abutting portion; and / or, The contact portion is connected to the battery cell.

13. The battery device according to claim 11, wherein: On a projection plane perpendicular to the height direction of the battery device, projections of at least a portion of the abutting portion overlap with the battery cells of two adjacent battery packs.

14. The battery device according to claim 11, wherein: The battery packs correspond to the exhaust channels one by one; and / or, A dimension of the abutting portion along the first direction is greater than or equal to a dimension of the battery pack along the first direction.

15. The battery device according to claim 10, characterized in that The exhaust channels are arranged at intervals, and the exhaust channels correspond to the pressure relief structures one by one.

16. The battery device according to claim 10, characterized in that The accommodating chamber further includes a connecting channel, the multiple exhaust channels are connected to the connecting channel, and the pressure relief structure is connected to the connecting channel.

17. The battery device according to any one of claims 1 to 3, characterized in that The box assembly includes a frame and a cover plate provided on the frame, the cover plate and the frame enclosing the accommodating cavity, the frame including a bottom plate, a first end plate, a second end plate, a first side plate and a second side plate, the bottom plate and the cover plate being arranged opposite to each other along the height direction of the box assembly; The first end plate and the second end plate are arranged opposite to each other along a first direction, the first side plate and the second side plate are arranged opposite to each other along a second direction, and the first direction, the second direction and the height direction of the box assembly intersect each other. At least one of the first end plate and the second end plate constitutes the first wall, The battery cell is supported on the bottom plate, and the first end plate, the second end plate, the first side plate, and the second side plate are all in contact with the battery cell.

18. An electrical device, characterized in that: Comprising a battery device according to any one of claims 1 to 17.

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