Battery device and electric device

Abstract

The battery device and the power utilization device are provided. The battery device comprises a box assembly, a pressure relief structure and a plurality of battery monomers. The box assembly is provided with a sealed containing cavity, and the box assembly has a first wall with a mounting channel. The plurality of battery monomers are arranged in the containing cavity. The pressure relief structure is sealedly arranged in the mounting channel. The pressure relief structure is arranged in a slanting manner along the thickness direction of the first wall. By arranging the pressure relief structure in the mounting channel, the assembly efficiency and the energy density of the battery device are improved. The space reserved between the battery monomers and the box assembly due to the avoidance of the pressure relief structure is reduced, so that the free air volume inside the containing cavity is reduced, the problem of fire caused by thermal runaway of the battery device is improved, the harm caused by abnormal accidents is reduced, the inflation test time of the battery device in the production process is shortened, the production efficiency is improved and the production cost is reduced, and the generation of condensate water inside the battery device is reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of batteries, and in particular, to a battery device and a power utilization device. BACKGROUND

[0002] In a power utilization device equipped with a battery device, the battery device can be used to provide power in whole or in part. In the process of thermal runaway of the battery device, high-temperature and high-pressure gas may be generated, and a pressure relief structure is often provided to quickly release pressure when the battery device is in thermal runaway. In the related art, the provision of the pressure relief structure occupies the space of the battery device, thus reducing the energy density of the battery device. SUMMARY

[0003] Therefore, the embodiments of the present disclosure aim to provide a battery device and a power utilization device, which can improve the energy density of the battery device to some extent.

[0004] To this end, a first aspect of the embodiments of the present disclosure provides a battery device, comprising:

[0005] a box assembly, the box assembly being provided with a sealed containing cavity, the box assembly having a first wall, the first wall having a mounting channel;

[0006] a plurality of battery cells, the plurality of battery cells being arranged in the containing cavity;

[0007] a pressure relief structure, the pressure relief structure being sealingly arranged in the mounting channel, the pressure relief structure being obliquely arranged along the thickness direction of the first wall.

[0008] The battery device provided by the embodiments of the present disclosure comprises a box assembly, a pressure relief structure and a plurality of battery cells, the box assembly has a sealed containing cavity, the plurality of battery cells are arranged in the containing cavity, and the box assembly plays a protective role on the battery cells. By sealingly arranging the pressure relief structure in the mounting channel, on the one hand, the space in the thickness direction of the first wall can be fully utilized, so that the space occupied by the pressure relief structure inside and / or outside the box assembly after installation can be reduced, thereby improving the assembly efficiency and energy density of the battery device, and on the other hand, the space reserved between the battery cells and the box assembly due to the avoidance of the pressure relief structure can be reduced, so that the free air volume inside the containing cavity can be reduced. In this way, it is beneficial to improve the problem of fire caused by thermal runaway of the battery device, reduce the harm caused by abnormal accidents, in addition, it can also shorten the air charging test time of the battery device in the production process, thereby improving the production efficiency and reducing the production cost, and in addition, it can also reduce the generation of condensed water inside the battery device.

[0009] By obliquely arranging the pressure relief structure, it is beneficial to further reduce the occupied space of the pressure relief structure, thereby further improving the energy density of the battery device.

[0010] 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 a direction from the second wall surface to the first wall surface.

[0011] Here, by arranging the pressure relief structure to be inclined upward along a direction from the second wall surface to the first wall surface, the height occupied by the pressure relief structure can be further reduced, thereby further improving the packing efficiency and energy density of the battery device, and the free air volume inside the accommodating cavity can be further reduced.

[0012] In some embodiments, a central axis of the pressure relief structure is perpendicular to a height direction of the battery device.

[0013] Here, by arranging the central axis of the pressure relief structure to be perpendicular to 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, and the thickness of the first wall can be reduced as much as possible under the premise of meeting the structural strength of the first wall, thereby further improving the mechanism compactness of the battery device and reducing the manufacturing cost.

[0014] In some embodiments, the mounting channel includes a first sub-channel and a second sub-channel connected in communication, the first sub-channel is connected to the accommodating cavity, and the second sub-channel is connected to the outside of the box assembly.

[0015] In a cross section perpendicular to the extension direction of the mounting channel, the cross-sectional area of the first sub-channel is smaller than the cross-sectional area of the second sub-channel.

[0016] Here, in a cross section perpendicular to the extension direction of the mounting channel, by arranging the cross-sectional area of the first sub-channel to be smaller than the cross-sectional area of the second sub-channel, the sealing fit between the pressure relief structure and the mounting channel can be achieved, and the assembly of the pressure relief structure is facilitated. In addition, the pressure relief structure can be quickly mounted and dismounted from the outside of the box assembly, and the installation and after-sales maintenance and replacement are facilitated.

[0017] In some embodiments, the first wall includes a stepped surface at the junction of the first sub-channel and the second sub-channel.

[0018] The pressure relief structure includes a first connecting section and a second connecting section connected in series, the second connecting section has a first fitting surface, at least part of the first connecting section extends into the first sub-channel, and the first fitting surface is in sealing fit with the stepped surface.

[0019] In the embodiment, the first wall is formed with a stepped surface at the junction of the first sub-channel and the second sub-channel, and the second connecting section is provided with a first matching surface, which is in sealing cooperation with the stepped surface, thereby improving the sealing performance between the pressure relief structure and the first wall, facilitating positioning of the pressure relief structure, and improving the assembly efficiency of the pressure relief structure.

[0020] In some embodiments, the first connecting section is threadedly connected with the first wall.

[0021] In the embodiment, the first connecting section is threadedly connected with the first wall, which is simple and reliable, can realize quick installation and disassembly of the pressure relief structure, facilitates installation and after-sales maintenance and replacement, further improves the reliability of the pressure relief structure, and does not require additional fasteners or other fixing parts, thereby reducing the cost. When the pressure relief structure is unscrewed, it can be directly pulled out of the installation channel. When assembly is required, the pressure relief structure is inserted into the installation channel, and then the pressure relief structure is tightened, which is convenient for disassembly and assembly.

[0022] In some embodiments, the battery device comprises a sealing member, which is sealingly clamped between the first matching surface and the stepped surface.

[0023] In the embodiment, the sealing member is provided and sealingly clamped between the first matching surface and the stepped surface, which is conducive to improving the reliability of the pressure relief structure.

[0024] In some embodiments, the lowest point of the first sub-channel near one end of the accommodating cavity is higher than the top wall of the battery monomer.

[0025] In this way, the battery monomer can be prevented from shielding the first sub-channel, thereby improving the pressure relief efficiency of the pressure relief structure.

[0026] In some embodiments, at least part of the battery monomers are arranged in a first direction to form a battery pack, and the first wall is arranged on at least one side of the battery pack along the first direction.

[0027] The battery monomer comprises a plurality of surfaces, including a first surface, which is the largest surface among the plurality of surfaces, and the first surface is perpendicular to the first direction.

[0028] 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 expansion beams and other components, reducing manufacturing costs and improving assembly efficiency. In addition, the first wall is thickened to improve the structural strength of the first wall, so that the first wall can better resist the expansion force of the battery cell. Further, the space in the thickness direction of the first wall can be fully utilized to arrange the pressure relief structure in the first wall, thereby reducing the space occupied by the pressure relief structure inside and / or outside the box assembly after installation, thereby improving the assembly efficiency and energy density of the battery device.

[0029] In some embodiments, the plurality of battery cells includes 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 intersects the second direction, and both are perpendicular to the height direction of the battery device.

[0030] The accommodation cavity includes a plurality of exhaust channels, the exhaust channels extend along the first direction, and the pressure relief part of the battery cell faces the exhaust channel, and the pressure relief structure communicates with the exhaust channel.

[0031] Here, by arranging the exhaust channel, the gas sprayed when the battery cell is in thermal runaway can be discharged into the exhaust channel, so as to quickly reach the position of the pressure relief structure through the exhaust channel and be discharged. In this way, it is beneficial to reduce the impact on other battery groups and improve the exhaust efficiency. In addition, the arrangement of the exhaust channel can reduce the space available for accommodating thermal runaway gas inside the battery device, thereby further improving the exhaust efficiency.

[0032] In some embodiments, the box assembly includes a frame and a cover plate arranged on the frame, the cover plate and the frame form the accommodation cavity, and the frame includes the first wall.

[0033] The box assembly further includes a plurality of abutting portions, the plurality of abutting portions are arranged at intervals along the second direction, and each of the abutting portions extends along the first direction, the abutting portion is arranged between the cover plate and the battery cell to form the exhaust channel.

[0034] Here, the box assembly is arranged with a plurality of abutting portions, so that the abutting portion is arranged between the cover plate and the battery cell to form the exhaust channel, which has a simple structure.

[0035] In some embodiments, the cover plate protrudes towards the battery cell to form the abutting portion.

[0036] That is, the abutting portion and the cover plate are of an integrated structure, which is beneficial to reduce components, reduce costs and improve assembly efficiency.

[0037] In some embodiments, the abutting portion is connected to the battery cell.

[0038] Here, the battery cell and the cover plate can be integrated, so that the overall rigidity of the battery device can be improved, the deformation of the box assembly can be improved, and the structural strength requirement of the box assembly can be reduced, for example, the thickness of the bottom wall of the box assembly can be appropriately reduced, which is beneficial to reduce the manufacturing cost. In addition, the abutting portion can also be used to constrain the battery pack in the first direction, limit the expansion of the module to both ends, that is, it can resist a certain expansion force, and reduce the strength requirement of the anti-expansion structure such as the first wall. In addition, the abutting portion is connected to the battery cell, which can prevent the cover plate from being convex, thereby limiting the deformation of the cover plate. In addition, it can also prevent the cover plate from increasing the test time and affecting the test results due to convexity during the inflation test.

[0039] In some embodiments, in the projection plane perpendicular to the height direction of the battery device, the projection of at least part of the abutting portion overlaps with the battery cell of the two adjacent battery packs.

[0040] That is, at least part of the abutting portion abuts against the battery cell of two battery packs at the same time, which is beneficial to further improve the overall structural strength of the battery device.

[0041] In some embodiments, the battery pack and the exhaust passage one-to-one correspond.

[0042] That is, each battery pack corresponds to an exhaust passage, so that when the battery cell of a single battery pack is in thermal runaway, the influence on the battery cell of the adjacent battery pack can be reduced, that is, the risk of thermal runaway diffusion is reduced. In addition, the number of abutting portions can be relatively increased, so that the structural strength of the battery device is relatively improved.

[0043] In some embodiments, the size of the abutting portion along the first direction is greater than or equal to the size of the battery pack along the first direction.

[0044] In this way, the size of the exhaust passage 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 passage can better guide the gas and improve the exhaust efficiency.

[0045] In some embodiments, the exhaust passages are arranged at intervals, and the exhaust passages and the pressure relief structure one-to-one correspond.

[0046] Therefore, the influence of the exhaust passage on the adjacent exhaust passage is further reduced, and the influence of the battery cell thermal runaway of the battery pack on the battery cell of the adjacent battery pack is reduced, for example, when one or more battery cells in a battery pack are in thermal runaway, the gas sprayed from the battery cell can quickly reach the position of the pressure relief structure through the top exhaust passage and be discharged, without affecting the battery cell of other battery packs. In addition, the path length of the thermal runaway gas discharged from the box assembly can be reduced, further improving the exhaust efficiency.

[0047] In some embodiments, the accommodation cavity further comprises a connecting channel, the plurality of exhaust passages are communicated to the connecting channel, and the pressure relief structure is communicated to the connecting channel.

[0048] Here, when the battery device has low energy or low exhaust requirement, the one end of the plurality of exhaust passages can be communicated through the connecting channel to make the gas in the plurality of exhaust passages discharged through one pressure relief structure, thereby reducing the number of pressure relief structures, reducing the manufacturing cost and improving the assembly efficiency.

[0049] In some embodiments, the box assembly comprises a frame and a cover plate arranged on the frame, the cover plate and the frame surround to form the accommodation cavity, the frame comprises a bottom plate, a first end plate, a second end plate, a first side plate and a second side plate, and the bottom plate and the cover plate are arranged opposite along the height direction of the box assembly.

[0050] The first end plate and the second end plate are arranged opposite along a first direction, and the first side plate and the second side plate are arranged opposite along a second direction, and the first direction, the second direction and the height direction of the box assembly cross each other,

[0051] At least one of the first end plate and the second end plate is configured as the first wall,

[0052] The battery cell is carried on the bottom plate, and the first end plate, the second end plate, the first side plate and the second side plate are in contact with the battery cell.

[0053] Since the first end plate, the second end plate, the first side plate and the second side plate are in contact with the battery cell, the overall assembly efficiency and the volume energy density of the battery device can be greatly improved.

[0054] The second aspect of the embodiments of the present disclosure provides a power utilization device comprising the above-mentioned battery device.

[0055] 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

[0056] Figure 1 A schematic diagram of the structure of an electric device provided in some embodiments of the present disclosure;

[0057] Figure 2 A schematic structural diagram of a battery device provided in some embodiments of the present disclosure;

[0058] Figure 3 The battery device provided in some embodiments of the present disclosure omits the structural schematic diagram of the cover plate;

[0059] Figure 4 A schematic structural diagram of a battery device provided in some other embodiments of the present disclosure;

[0060] Figure 5 for Figure 4 A cross-sectional view of the battery device in the AA direction shown in FIG;

[0061] Figure 6 for Figure 4 A cross-sectional view of the battery device along the BB direction shown in FIG;

[0062] Figure 7 for Figure 5 Enlarged view of point C in the middle;

[0063] Figure 8 A cross-sectional view of a battery device located at an exhaust channel according to some embodiments of the present disclosure;

[0064] Figure 9 A cross-sectional view of a battery device located at an exhaust channel according to some other embodiments of the present disclosure;

[0065] Figure 10 A schematic structural diagram of a pressure relief structure provided in some embodiments of the present disclosure;

[0066] Figure 11 A structural schematic diagram of the cover plate provided in the embodiments of the present application.

[0067] Legend of reference signs

[0068] 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, abutting portion; 23, first wall; 231, first wall surface; 232, second wall surface; 233, mounting passage; 234, first sub-passage; 235, second sub-passage; 236, step surface; 30, pressure relief structure; 31, first connecting section; 32, second connecting section; 33, first mating surface; 40, sealing member; 50, exhaust passage; 60, connecting passage; 100, battery device; 200, controller; 300, motor; 1000, vehicle. DETAILED DESCRIPTION

[0069] If not specifically stated, all embodiments and optional embodiments of the present disclosure can be combined with each other to form new technical solutions.

[0070] If not specifically stated, all technical features and optional technical features of the present disclosure can be combined with each other to form new technical solutions.

[0071] With the development of clean energy, more and more devices use electric energy as driving energy, and then as power batteries that can store more electric energy and can be charged and discharged repeatedly, such as lithium ion batteries. Among them, power batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind and solar power stations, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields.

[0072] In the embodiments of the present disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0073] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present disclosure are not limited thereto.

[0074] The battery cell generally comprises an electrode assembly. The electrode assembly comprises a positive electrode, a negative electrode, and a separator disposed between the negative electrode and the positive electrode. During the charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive electrode and the negative electrode from short-circuiting while allowing the active ions to pass through.

[0075] The electrode assembly can be in a wound structure, a stacked structure, or a hybrid structure of the wound and stacked structures.

[0076] In some embodiments, the electrode assembly is in a wound structure. The positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0077] In some embodiments, the electrode assembly is in a stacked structure.

[0078] For example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be alternately stacked.

[0079] For example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked. One positive electrode sheet can be clamped between adjacent folded segments.

[0080] For example, both the positive electrode sheet and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0081] For example, a plurality of separators can be provided, each being disposed between any adjacent positive electrode sheet or negative electrode sheet.

[0082] For example, the separators can be continuously provided and disposed between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0083] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0084] In some embodiments, the electrode assembly can be provided with a tab. The tab can guide current out of the electrode assembly. The tab can include a positive tab and a negative tab.

[0085] In some embodiments, the battery cell can comprise a housing. The housing can be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., a copper-aluminum composite shell), or an aluminum-plastic film, etc. In some embodiments, the housing can be a sealed structure or a non-sealed structure. For example, when the housing is a non-sealed structure, the housing can protect the electrode assembly. The housing and the electrode assembly can further comprise a sealing bag for encapsulating the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, the housing can encapsulate the electrode assembly and the electrolyte, etc.

[0086] 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, the prismatic battery cell including a square battery cell, a blade battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, and the like, without particular limitation in the present disclosure.

[0087] In some embodiments, the housing includes an end cover and a shell, the shell is provided with an opening, and the end cover is provided on the opening. The shell can be provided with one or more openings. The end cover can also be provided with one or more openings.

[0088] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected with the tab. The electrode terminal can be directly connected with the tab or indirectly connected with the tab through a current collecting member. The electrode terminal can be provided on the end cover or on the shell.

[0089] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0090] In the process of thermal runaway of the battery device, high-temperature and high-pressure gas may be generated, and a pressure relief structure is often provided to quickly release the pressure when the battery device is in thermal runaway. In the related art, the setting of the pressure relief structure occupies the space of the battery device, thus reducing the energy density of the battery device. For example, part of the structure of the pressure relief structure extends into the accommodation cavity, and a certain distance needs to be maintained between the pressure relief structure and the battery cell, which may cause a large gap to be left between the inner wall of the box assembly and the battery cell, resulting in a large free volume inside the box assembly, and more combustible gas being stored inside the box when the battery device is in thermal runaway. In addition, during the production process of the battery device, a longer test time is required for the air tightness test, resulting in a longer product production rhythm. In addition, for example, part of the structure of the pressure relief structure extends out of the box assembly, and an opening space of the pressure relief structure needs to be reserved outside the box assembly, further reducing the overall assembly efficiency of the battery device.

[0091] In view of this, in order to improve the assembly efficiency and energy density of the battery device, the present disclosure provides a battery device, which includes a box assembly, a pressure relief structure, and a plurality of battery cells. The box assembly is provided with a sealed accommodation cavity, and the box assembly has a first wall with a mounting channel. The plurality of battery cells are arranged in the accommodation cavity. The pressure relief structure is sealingly arranged in the mounting channel. The pressure relief structure is inclined along the thickness direction of the first wall.

[0092] The battery device provided by the embodiments of the present disclosure comprises a box assembly, a pressure relief structure and a plurality of battery monomers. The box assembly has a sealed containing cavity, and the plurality of battery monomers are arranged in the containing cavity. The box assembly protects the battery monomers. By sealing the pressure relief structure in the mounting channel, on the one hand, the space in the thickness direction of the first wall can be fully utilized, thereby reducing the space occupied by the pressure relief structure in the interior and / or exterior of the box assembly after installation, thereby improving the grouping efficiency and energy density of the battery device. On the other hand, the space reserved between the battery monomers and the box assembly due to the avoidance of the pressure relief structure can be reduced, thereby reducing the free air volume in the interior of the containing cavity. In this way, the problem of fire caused by thermal runaway of the battery device can be improved, the harm caused by abnormal accidents can be reduced, in addition, the air charging test time of the battery device in the production process can be shortened, thereby improving the production efficiency and reducing the production cost. In addition, the generation of condensate in the interior of the battery device can be reduced.

[0093] The technical solutions described in the embodiments of the present disclosure are suitable for use in an electric device using a battery device. The electric device comprises the battery device of any of the embodiments of the present disclosure, and the battery device is used to provide electric energy.

[0094] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc. The embodiments of the present disclosure do not specially limit the above-mentioned electric devices.

[0095] It should be noted that the technical solutions described in the embodiments of the present disclosure are not only limited to the above-mentioned battery device, but also can be applied to all electric devices and energy storage devices comprising the battery device. However, for the sake of simplicity, the following embodiments are described by taking an electric vehicle as an example.

[0096] Please refer to Figure 1The inside of the vehicle 1000 can be provided with a controller 200, a motor 300, and a battery device 100, the controller 200 being configured to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be arranged at the bottom or the front or the rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000, for example, the battery device 100 can be used as the operating power source of the vehicle 1000, for example, to supply power to the circuit system of the vehicle 1000, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and operation. In another embodiment of the present disclosure, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power to the vehicle 1000.

[0097] Please refer to Figures 2 to 7 The battery device 100 provided in the embodiments of the present disclosure includes a box assembly 20, a pressure relief structure 30, and a plurality of battery monomers 11. The box assembly 20 is provided with a sealed containing cavity, and the box assembly 20 has a first wall 23. The first wall 23 has a mounting channel 233. The plurality of battery monomers 11 are arranged in the containing cavity. The pressure relief structure 30 is sealingly arranged in the mounting channel 233.

[0098] The plurality of battery monomers 11 refer to two or more battery monomers.

[0099] In order to meet different power requirements, the battery device 100 includes a plurality of battery monomers 11, and the battery monomer 11 refers to the smallest unit of a battery module or a battery pack. The plurality of battery monomers 11 can be connected in series, in parallel, or in a mixed manner. The mixed manner refers to that the plurality of battery monomers 11 are connected in series and in parallel. The plurality of battery monomers 11 can be directly connected in series, in parallel, or in a mixed manner, and then the plurality of battery monomers 11 are contained in the box assembly 20; of course, the battery device 100 can also be that the plurality of battery monomers 11 are connected in series, in parallel, or in a mixed manner to form a battery module, and then the plurality of battery modules are connected in series, in parallel, or in a mixed manner to form a whole, and then the whole is contained in the box assembly 20. The battery device 100 can further include other structures, for example, the battery device 100 can further include a current combiner for realizing the electrical connection between the plurality of battery monomers 11. Each battery monomer 11 can be a secondary battery or a primary battery; can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery monomer 11 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes.

[0100] The box assembly 20 can be a simple cuboid or cylinder or sphere, or a complex cuboid or cylinder or sphere formed by combination of simple cuboids or cylinders or spheres. The box 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.

[0101] The box assembly 20 is used to encapsulate the battery cell 11, and can prevent liquid or other foreign matters from affecting the charging or discharging of the battery cell 11.

[0102] For example, the box assembly 20 is generally a cuboid, and the length direction and the width direction of the box assembly 20 are parallel to the horizontal plane. The length direction of the box assembly 20 is parallel to the longest side of the cuboid structure of the box assembly 20. The height direction of the box assembly 20 is perpendicular to the ground.

[0103] The box assembly 20 can have various structural forms.

[0104] In some embodiments, the box assembly 20 can include a first box (the cover plate 22) and a second box (the frame 21), and the first box and the second box are coupled to each other to define a receiving cavity for receiving the battery cell 11.

[0105] For example, as shown in 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.

[0106] To improve the sealing performance of the first box and the second box after being coupled, a sealing member 40 such as sealing glue or a sealing member 40 can be arranged between the first box and the second box.

[0107] The first box can also be referred to as an upper box cover, and the second box can also be referred to as a lower box cover.

[0108] The box assembly 20 is used to receive the battery cell 11, and the box assembly 20 can have various structures, which are not limited herein.

[0109] For example, the first wall 23 can be a side wall, a top wall, or a bottom wall of the box assembly 20.

[0110] The pressure relief structure 30 is arranged in the mounting channel 233, that is, the pressure relief structure 30 is arranged in the first wall 23, and the pressure relief structure 30 is used to discharge the internal gas of the box assembly 20.

[0111] As an example, the internal pressure or temperature of the box assembly 20 reaches a predetermined threshold value to actuate to release the internal pressure or temperature. When the internal pressure or temperature of the box assembly 20 reaches the predetermined threshold value, the pressure relief structure 30 performs an action or a weak structure provided in the pressure relief structure 30 is broken, thereby forming an opening or passage for the internal pressure or temperature to be released. The threshold value is designed differently according to design requirements. The threshold value can depend on parameters such as the energy density of the battery device 100.

[0112] As an example, the pressure relief structure 30 can be an explosion-proof valve.

[0113] As an example, when the battery device 100 generates high-temperature fluid due to thermal runaway, the pressure relief structure 30 performs an action when the internal pressure or temperature of the box assembly 20 reaches a predetermined threshold value, for discharging the generated high-temperature fluid to the outside of the battery device 100, so that the situation that the high-temperature fluid damages other normally used battery cells 11 can be improved.

[0114] Since the box assembly 20 is provided with a sealed containing cavity, a sealed space can be formed inside the box assembly 20, and a stable environment free from external environmental interference can be provided for components (such as the battery cells 11) located inside the box assembly 20, so that the battery device 100 can be assembled in a power-using device or an energy storage device even without further boxing like a battery module.

[0115] Here, by sealing the pressure relief structure 30 in the mounting channel 233, that is, the thickness dimension of the first wall 23 can be fully utilized, the space of the box assembly 20 occupied by the pressure relief structure 30 can be reduced, and the compactness of the battery device 100 can be improved.

[0116] It can be understood that, by sealing the pressure relief structure 30 in the mounting channel 233, Figure 7 It can be understood that, by sealing the pressure relief structure 30 in the mounting channel 233,

[0117] The battery device 100 provided by the embodiments of the present disclosure includes a box assembly 20, a pressure relief structure 30, and a plurality of battery monomers 11. The box assembly 20 has a containing cavity, and the plurality of battery monomers 11 are arranged in the containing cavity. The box assembly 20 protects the battery monomers 11. By arranging the pressure relief structure 30 in the first wall 23, on the one hand, the space in the thickness direction of the first wall 23 can be fully utilized, so that the space occupied by the pressure relief structure 30 inside and / or outside the box assembly 20 after installation can be reduced, thereby improving the assembly efficiency and energy density of the battery device 100. On the other hand, the space reserved between the battery monomers 11 and the box assembly 20 due to the avoidance of the pressure relief structure 30 can be reduced, so that the free air volume inside the containing cavity can be reduced. In this way, it is beneficial to improve the problem of fire caused by thermal runaway of the battery device 100, reduce the harm caused by abnormal accidents, in addition, the inflation test time of the battery device 100 in the production process can be shortened, thereby improving the production efficiency and reducing the production cost. In addition, the generation of condensate water inside the battery device 100 can also be reduced.

[0118] In some embodiments, referring to Figure 7 , the pressure relief structure 30 is arranged obliquely along the thickness direction of the first wall 23.

[0119] That is, the central axis of the pressure relief structure 30 is not parallel to the thickness direction of the first wall 23.

[0120] Here, the thickness direction of the first wall 23 is the first direction.

[0121] It can be understood that for the same size of the pressure relief structure 30, the space required for the oblique arrangement of the central axis of the pressure relief structure 30 compared to the parallel arrangement to the thickness direction of the first wall 23 is more.

[0122] Here, by arranging the pressure relief structure 30 obliquely, it is beneficial to further reduce the occupied space of the pressure relief structure 30, thereby further improving the energy density of the battery device 100.

[0123] There are many ways to arrange the pressure relief structure 30 obliquely.

[0124] In some embodiments, referring to Figures 5 to 7 , the first wall 23 has a first wall surface 231 facing the containing cavity and a second wall surface 232 away from the containing cavity. The pressure relief structure 30 is arranged obliquely upward along the direction from the second wall surface 232 to the first wall surface 231.

[0125] 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.

[0126] 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.

[0127] In the direction from the second wall surface 232 to the first wall surface 231, the pressure relief structure 30 is arranged in an upwardly inclined manner, that is, the air inlet of the pressure relief structure 30 faces the inside of the battery assembly 20 and is inclined upwardly, and the air outlet of the pressure relief structure 30 faces the outside of the battery assembly 20 and is inclined downwardly, so that the distance between the inner surface of the top wall of the battery assembly 20 and the top wall of the battery cell 11 can be reduced, and the height dimension occupied by the pressure relief structure 30 can be further reduced under the premise of ensuring normal exhaust of the pressure relief structure 30, which is conducive to further reducing the grouping efficiency and energy density of the battery device 100.

[0128] Here, in the direction from the second wall surface 232 to the first wall surface 231, by arranging the pressure relief structure 30 in an upwardly inclined manner, the height dimension occupied by the pressure relief structure 30 can be further reduced, so that the grouping efficiency and energy density of the battery device 100 are further improved, and the free air volume inside the accommodation cavity can be further reduced.

[0129] In some embodiments, the central axis of the pressure relief structure 30 is perpendicular to the height direction of the battery device 100.

[0130] That is, in the case where 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.

[0131] Here, by arranging the central axis of the pressure relief structure 30 perpendicular to 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, and the thickness of the first wall 23 can be reduced as much as possible under the premise of meeting the structural strength of the first wall 23, which is conducive to further improving the mechanism compactness of the battery device 100 and reducing the manufacturing cost.

[0132] In some embodiments, referring to Figure 7 , one end of the pressure relief structure 30 close to the accommodation cavity does not exceed the first wall surface 231.

[0133] That is, the one end of the pressure relief structure 30 close to the accommodation cavity is flush with the first wall surface 231, or has a certain gap with the first wall surface 231.

[0134] That is, the pressure relief structure 30 does not extend into the accommodation cavity, so that the pressure relief structure 30 does not occupy the space inside the accommodation cavity.

[0135] In some embodiments, referring to Figure 7 , one end of the pressure relief structure 30 away from the accommodation cavity does not exceed the second wall surface 232.

[0136] That is, the pressure relief structure 30 is flush with the second wall surface 232 or has a gap with the second wall surface 232 at the end away from the accommodating cavity.

[0137] That is, the pressure relief structure 30 does not protrude into the accommodating cavity, so that the pressure relief structure 30 can occupy as little space outside the accommodating cavity as possible.

[0138] In some embodiments, referring to Figures 5 to 7 The mounting channel 233 includes a first sub-channel 234 and a second sub-channel 235 connected in series, the first sub-channel 234 is connected to the accommodating cavity, and the second sub-channel 235 is connected to the outside of the cabinet assembly 20. In a cross section perpendicular to the extension direction of the mounting channel 233, the cross-sectional area of the first sub-channel 234 is smaller than that of the second sub-channel 235.

[0139] Exemplarily, the mounting channel 233 is also inclined along the thickness direction of the first wall 23, and the pressure relief structure 30 is arranged in the mounting channel 233, so as to achieve the inclined arrangement of the pressure relief structure 30.

[0140] The mounting channel 233 includes a first sub-channel 234 and a second sub-channel 235 connected in series, the first sub-channel 234 is connected to the accommodating cavity, and the second sub-channel 235 is connected to the outside of the cabinet assembly 20. In other words, along the direction from the inside of the cabinet assembly 20 to the outside of the cabinet assembly 20, the mounting channel 233 includes the first sub-channel 234 and the second sub-channel 235 connected in series.

[0141] Exemplarily, the cross-sectional area of the second sub-channel 235 is larger than the outer dimension of the pressure relief structure 30, which can facilitate the assembly of the pressure relief structure 30 and the movement of the start 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.

[0142] The cross-sectional area of the first sub-channel 234 is smaller than that of the second sub-channel 235, so as to facilitate the sealing cooperation between the pressure relief structure 30 and the mounting channel 233 and the assembly of the pressure relief structure 30.

[0143] Here, in a cross section perpendicular to the extension direction of the mounting channel 233, by setting the cross-sectional area of the first sub-channel 234 to be smaller than that of the second sub-channel 235, the sealing cooperation between the pressure relief structure 30 and the mounting channel 233 is achieved, and the assembly of the pressure relief structure 30 is facilitated. In addition, the pressure relief structure 30 can be quickly installed and removed from the outside of the cabinet assembly 20, and the installation and after-sales maintenance and replacement are facilitated.

[0144] There are various ways to seal the pressure relief structure 30 in the mounting channel 233.

[0145] In some embodiments, referring to Figures 5 to 7 The first wall 23 comprises a step surface 236 at the junction of the first sub-passage 234 and the second sub-passage 235. The pressure relief structure 30 comprises a first connecting section 31 and a second connecting section 32 connected together, and the second connecting section 32 has a first mating surface 33. At least part of the first connecting section 31 extends into the first sub-passage 234, and the first mating surface 33 sealingly mates with the step surface 236.

[0146] Exemplarily, the pressure relief structure 30 is substantially a columnar structure, and the mounting passage 233 is also substantially a columnar passage.

[0147] Referring to Figure 10 The pressure relief structure 30 comprises a first connecting section 31 and a second connecting section 32 connected together, the first connecting section 31 is used to mate with the first sub-passage 234, and the second connecting section 32 is used to mate with the second sub-passage 235.

[0148] Exemplarily, in a cross section perpendicular to the extending direction of the mounting passage 233, the cross sectional dimension of the first connecting section 31 is smaller than that of the second connecting section 32.

[0149] Exemplarily, there is a gap between the second connecting section 32 and the side wall of the second sub-passage 235, which facilitates the installation of the pressure relief structure 30, and also facilitates the movement of the start switch of the pressure relief structure 30 in the second sub-passage 235, thereby improving the reliability of the pressure relief structure 30.

[0150] The at least part of the first connecting section 31 extending into the first sub-passage 234 means that part of the first connecting section 31 can extend into the first sub-passage 234, or all of the first connecting section 31 can extend into the first sub-passage 234.

[0151] The air inlet of the pressure relief structure 30 is formed on the first connecting section 31, at least part of the first connecting section 31 extends into the first sub-passage 234, and the air inlet of the pressure relief structure 30 is in communication with the first sub-passage 234.

[0152] Here, the air flow in the accommodating cavity can enter the air inlet through the first sub-passage 234, or the air flow in the accommodating cavity can directly enter the air inlet, or part of the air flow in the accommodating cavity can enter the air inlet through the first sub-passage 234, and the other part of the air flow in the accommodating cavity can directly enter the air inlet.

[0153] 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 in communication with the second sub-passage 235, that is, in the closed state of the pressure relief structure 30, the air outlet is not in communication with the second sub-passage 235, and in the open state of the pressure relief structure 30, the air outlet is in communication with the second sub-passage 235.

[0154] Here, the air flow in the containing cavity can be sequentially discharged to the outside of the cabinet assembly 20 through the air outlet and the second sub-channel 235, the air flow can also be directly discharged to the outside of the cabinet assembly 20 through the air outlet, part of the air flow in the containing cavity can be sequentially discharged to the outside of the cabinet assembly 20 through the air outlet and the second sub-channel 235, and the other part of the air flow can be directly discharged to the outside of the cabinet assembly 20 through the air outlet.

[0155] Exemplarily, the first matching surface 33 faces the outside of the cabinet assembly 20.

[0156] Here, the first matching surface 33 can be in direct contact with the stepped surface 236 to achieve a sealed fit between the first matching surface 33 and the stepped surface 236, or the first matching surface 33 and the stepped surface 236 can not be in direct contact, and other components are used to achieve a sealed fit between the first matching surface 33 and the stepped surface 236.

[0157] In this embodiment, by forming the stepped surface 236 at the junction of the first sub-channel 234 and the second sub-channel 235 of the first wall 23, and providing the second connecting section 32 with the first matching surface 33, the first matching surface 33 and the stepped surface 236 are sealed and fitted, which improves the sealing performance between the pressure relief structure 30 and the first wall 23, and facilitates positioning of the pressure relief structure 30, improving the assembly efficiency of the pressure relief structure 30.

[0158] In some embodiments, referring to Figures 5 to 7 , the first connecting section 31 is threadedly connected with the first wall 23.

[0159] Exemplarily, the first connecting section 31 is provided with external threads, and the sidewall of the first sub-channel 234 is provided with internal threads that are adapted to the external threads of the first connecting section 31.

[0160] During the process of screwing the pressure relief structure 30 on the first wall 23, the distance between the first matching surface 33 and the stepped surface 236 gradually decreases until the first matching surface 33 and the stepped surface 236 are sealed and fitted. Since the threaded connection can continuously adjust the distance between the first matching surface 33 and the stepped surface 236, the threaded connection between the pressure relief structure 30 and the first wall 23 can seal and fit the first matching surface 33 and the stepped surface 236, eliminate the gap between the first matching surface 33 and the stepped surface 236, and further improve the reliability of the pressure relief structure 30, regardless of whether there is an error in the length of the pressure relief structure 30 and the first wall 23.

[0161] In the embodiment, the first connecting section 31 is threadedly connected with the first wall 23, the connection structure is simple and reliable, the pressure relief structure 30 can be quickly installed and disassembled, and the installation and after-sales maintenance and replacement are convenient, and the reliability of the pressure relief structure 30 can be further improved, in addition, no additional fasteners and other fixing parts are needed, and the cost is reduced. When the pressure relief structure 30 is unscrewed, the pressure relief structure 30 is directly extracted from the installation channel 233. When assembly is needed, the pressure relief structure 30 is inserted into the installation channel 233, and then the pressure relief structure 30 is tightened, and the disassembly and assembly are relatively convenient.

[0162] In some embodiments, please continue to refer to Figures 5 to 7 The battery device 100 includes a sealing piece 40, and the sealing piece 40 is clamped between the first matching surface 33 and the stepped surface 236.

[0163] In the process of screwing the pressure relief structure 30 on the first wall 23, the distance between the first matching surface 33 and the stepped surface 236 gradually decreases until the opposite ends of the sealing piece 40 are clamped on the first matching surface 33 and the stepped surface 236. Since the threaded connection can continuously adjust the distance between the first matching surface 33 and the stepped surface 236, whether there is an error in the length of the pressure relief structure 30 and the first wall 23, the threaded connection of the pressure relief structure 30 and the first wall 23 and the arrangement of the sealing piece 40 can seal the first matching surface 33 and the stepped surface 236, eliminate the gap between the first matching surface 33 and the stepped surface 236, and further improve the reliability of the pressure relief structure 30.

[0164] In the embodiment, by arranging the sealing piece 40 and clamping the sealing piece 40 between the first matching surface 33 and the stepped surface 236, the reliability of the pressure relief structure 30 is improved.

[0165] In some embodiments, please refer to Figure 7 The lowest point of the first sub-channel 234 near one end of the accommodating cavity is higher than the top wall of the battery monomer 11.

[0166] It should be noted that the height of the top wall of the battery monomer 11 does not include the height of the protruding parts such as the pole and the pressure relief part, that is, the height corresponding to the top wall of the shell of the battery monomer 11, that is, the lowest point of the first sub-channel 234 near one end of the accommodating cavity is higher than the shell of the battery monomer 11.

[0167] In this way, it is beneficial to improve the situation that the battery monomer 11 blocks the first sub-channel 234, thereby improving the pressure relief efficiency of the pressure relief structure 30.

[0168] Exemplarily, the plurality of battery cells 11 comprises a plurality of battery groups 10, each battery group 10 comprises 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 both are perpendicular to the height direction of the battery device 100.

[0169] The first direction intersects with the second direction, that is, the first direction is not parallel to the second direction, and exemplarily, the first direction is perpendicular to the second direction, that is, the first direction, the second direction, and the height direction of the battery device 100 are perpendicular.

[0170] That is, the plurality of battery cells 11 are arranged in a row-column manner.

[0171] In some embodiments, referring to Figure 3 and Figure 6 , at least part of the battery cells 11 are arranged along the first direction to form a battery group 10, and the first wall 23 is arranged on at least one side of the battery group 10 along the first direction. The battery cell 11 comprises a plurality of surfaces, and the plurality of surfaces comprises a first surface 111, which is the largest surface among the plurality of surfaces. The first surface 111 is perpendicular to the first direction.

[0172] It should be noted that the first surface 111 described in the embodiments of the present application is the large surface of the battery cell 11, which is the largest surface among the plurality of surfaces of the battery cell 11.

[0173] Taking a square battery cell 11 as an example, in the vertical state, the surface formed by the length direction and the width direction of the battery cell 11 is the bottom surface of the battery cell 11, the surface formed by the length direction and the height direction of the battery cell 11 is the large surface of the battery cell 11, and the surface formed by the width direction and the height direction of the battery cell 11 is the side surface of the battery cell 11.

[0174] The first wall 23 arranged on at least one side of the battery group 10 along the first direction means that the first wall 23 can be arranged on one side of the battery group 10 along the first direction, or the first wall 23 can be arranged on both sides of the battery group 10 along the first direction.

[0175] In some embodiments, referring to Figure 3 and Figure 7 , the battery cell 11 at the end of the battery group 10 along the first direction can abut against the first wall 23, and the first wall 23 can be used to constrain the battery group 10 in the first direction and at least to bear the expansion force of the battery cell 11. Here, the expansion force specifically refers to the force applied to the box assembly 20 due to the expansion deformation of the battery cell 11. As an example, the first wall 23 mainly bears the expansion force in the first direction.

[0176] Since the expansion force of the battery cell 11 at the first surface 111 is relatively large, by setting the first surface 111 to be perpendicular to the first direction, so that the first wall 23 is used to constrain the battery pack 10 in the first direction, thus, it is beneficial to improve the reliability of the battery device 100.

[0177] Here, by setting the first wall 23 on at least one side of the battery pack 10 along the first direction, so that the first wall 23 can be used to constrain the battery pack 10 in the first direction, thus, it can reduce the use of expansion beams and other components, reduce manufacturing costs and improve 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. Further, the space in the thickness direction of the first wall 23 can be fully utilized to set the pressure relief structure 30 in the first wall 23, so that the space occupied by the pressure relief structure 30 inside and / or outside the box assembly 20 after installation can be reduced, thereby improving the assembly efficiency and energy density of the battery device 100.

[0178] In some embodiments, referring to Figures 6 to 9 , the accommodation cavity includes a plurality of exhaust channels 50, the exhaust channels 50 extend along the first direction, the pressure relief part of the battery cell 11 is directed to the exhaust channel 50, and the pressure relief structure 30 is in communication with the exhaust channel 50.

[0179] The pressure relief part of the battery cell 11 is directed to the exhaust channel 50, that is, the gas flow in the battery cell 11 can be discharged into the exhaust channel 50.

[0180] Here, by setting the exhaust channel 50, the gas sprayed when the battery cell 11 is in thermal runaway can be discharged into the exhaust channel 50 to quickly reach the position of the pressure relief structure 30 through the exhaust channel 50 and be discharged, thus, it is beneficial to reduce the impact on other battery packs 10 and improve the exhaust efficiency. In addition, the setting of the exhaust channel 50 can reduce the space available for accommodating thermal runaway gas inside the battery device 100, thereby further improving the exhaust efficiency.

[0181] In some embodiments, referring to Figures 6 to 9 , the box assembly 20 includes a frame 21 and a cover plate 22 arranged on the frame 21, and the cover plate 22 and the frame 21 form an accommodation cavity. The frame 21 includes a first wall 23. The box assembly 20 further includes a plurality of abutting portions 221, the plurality of abutting portions 221 are arranged in the second direction and each abutting portion 221 extends in the first direction, and the abutting portion 221 is arranged between the cover plate 22 and the battery cell 11 to form the exhaust channel 50.

[0182] That is, the abutting portion 221, the cover plate 22 and the battery cell 11 jointly define the exhaust channel 50.

[0183] Exemplarily, the number of abutment portions 221 is multiple, and each abutment portion 221 is arranged in the second direction to form multiple exhaust passages 50 with the cover plate 22 and the battery cells 11.

[0184] Exemplarily, in the second direction, at least one pressure relief portion of the battery cell 11 is arranged between two adjacent abutment portions 221.

[0185] Here, the box assembly 20 is arranged with multiple abutment portions 221, so that the abutment portions 221 are arranged between the cover plate 22 and the battery cells 11 to form the exhaust passage 50, which is simple in structure.

[0186] In some embodiments, referring to Figure 11 The cover plate 22 protrudes towards the battery cell 11 to form the abutment portion 221.

[0187] Here, the cover plate 22 can be partially thickened, that is, the thickened area protrudes towards the battery cell 11 to form the abutment portion 221, that is, the wall thickness of the area of the cover plate 22 where the abutment portion 221 is located is greater than that of other areas of the cover plate 22. The cover plate 22 can be formed by a plastic plate through a plastic suction molding process, can be formed by a plastic injection molding process, and can also be formed by a composite material through a die pressing process.

[0188] The cover plate 22 can also be recessed away from the battery cell 11, so that the cover plate 22 protrudes towards the battery cell 11 to form the abutment portion 221, that is, the wall thickness of the area of the cover plate 22 where the abutment portion 221 is located is equal to that of other areas of the cover plate 22. The cover plate 22 can be formed by a plastic plate through a plastic suction molding process, can be formed by a plastic injection molding process, and can also be formed by a composite material through a die pressing process, or can be formed by a metal plate through a stamping process.

[0189] Exemplarily, the cover plate 22 can be a flat plate structure, or other structure forms such as a reverse pot type.

[0190] That is, the abutment portion 221 and the cover plate 22 are integrated, which is beneficial to reduce parts, reduce cost and improve assembly efficiency.

[0191] Of course, in other embodiments, the abutment portion 221 and the cover plate 22 can also be a split structure, and the abutment portion 221 can be connected to the cover plate 22.

[0192] In some embodiments, referring to Figure 6 The abutment portion 221 is connected to the battery cell 11.

[0193] Exemplarily, the abutment portion 221 is connected to all the battery cells 11 of at least one battery pack 10.

[0194] Exemplarily, the abutting portion 221 is adhesively connected with the battery cell 11.

[0195] Exemplarily, the abutting portion 221 is connected with the shoulder of the battery cell 11.

[0196] Here, by connecting the abutting portion 221 with the battery cell 11, the battery cell 11 and the cover plate 22 can form an integral whole, so that the overall rigidity of the battery device 100 can be improved, the situation of deformation of the box assembly 20 can be improved, and the requirement for the structural strength of the box assembly 20 can be reduced, for example, the thickness of the bottom wall of the box assembly 20 can be appropriately reduced, which is beneficial to reducing the manufacturing cost. In addition, the abutting portion 221 can also be used to constrain the battery pack 10 in the first direction, limit the effect of the module expanding to both ends, that is, a certain expansion force can be resisted, and the strength requirement of the anti-expansion structure such as the first wall 23 is reduced. In addition, the abutting portion 221 is connected with the battery cell 11, which can prevent the cover plate 22 from being convex, thereby playing a role in limiting the deformation of the cover plate 22. In addition, it can also prevent the cover plate 22 from increasing the test time and affecting the test results due to convexity during the inflation test.

[0197] Exemplarily, the battery cell 11 is adhesively connected with the bottom wall of the box assembly 20.

[0198] In some embodiments, referring to Figure 6 In the projection plane perpendicular to the height direction of the battery device 100, the projection of at least part of the abutting portion 221 overlaps with the battery cells 11 of the adjacent two battery packs 10.

[0199] That is, at least part of the abutting portion 221 abuts against the battery cells 11 of the two adjacent battery packs 10, which is beneficial to further improving the overall structural strength of the battery device 100.

[0200] Here, the projection of part of the abutting portion 221 can overlap with the battery cells 11 of the adjacent two battery packs 10, and the projection of all of the abutting portion 221 can also overlap with the battery cells 11 of the adjacent two battery packs 10.

[0201] In some embodiments, referring to Figure 6 and Figure 8 The battery pack 10 corresponds to one exhaust passage 50.

[0202] That is, each battery pack 10 corresponds to one exhaust passage 50, so that when the battery cells 11 of a single battery pack 10 are in thermal runaway, the influence on the battery cells 11 of the adjacent battery pack 10 can be reduced, that is, the risk of thermal runaway spreading is reduced. In addition, the number of abutting portions 221 can be relatively increased, so that the structural strength of the battery device 100 is relatively improved.

[0203] Of course, in other embodiments, at least part of the exhaust passage 50 can correspond to multiple battery packs 10.

[0204] In some embodiments, referring to Figure 8 and Figure 11 , the size of the abutment portion 221 along the first direction is greater than or equal to the size of the battery pack 10 along the first direction.

[0205] In this way, the size of the exhaust passage 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 passage 50 can better guide the gas and improve the exhaust efficiency.

[0206] In some embodiments, referring to Figure 6 and Figure 8 , the exhaust passages 50 are spaced apart, and each exhaust passage 50 corresponds to a pressure relief structure 30.

[0207] That is, each exhaust passage 50 corresponds to a pressure relief structure 30.

[0208] Here, the exhaust passages 50 are spaced apart, that is, the exhaust passages 50 are not connected to each other.

[0209] Exemplarily, the two ends of the abutment portion 221 abut against the side wall of the box assembly 20, so that the adjacent exhaust passages 50 are not connected to each other.

[0210] In this way, it is beneficial to further reduce the influence of the exhaust passage 50 on the adjacent exhaust passage 50, thereby reducing the influence of the battery monomer 11 of the battery pack 10 when the battery monomer 11 of the battery pack 10 is in thermal runaway on the battery monomer 11 of the adjacent battery pack 10. For example, when one or more battery monomers 11 in a certain battery pack 10 are in thermal runaway, the gas sprayed by the battery monomer 11 can quickly reach the position of the pressure relief structure 30 through the exhaust passage 50 at the top and be discharged, without affecting the battery monomer 11 of other battery packs 10. In addition, the path length of the thermal runaway gas discharged from the box assembly 20 can also be reduced, thereby further improving the exhaust efficiency.

[0211] Of course, in other embodiments, at least part of the pressure relief structure 30 can correspond to multiple exhaust passages 50.

[0212] In some embodiments, referring to Figure 6 and Figure 9 , the accommodation cavity further comprises a connecting passage 60, the multiple exhaust passages 50 are connected to the connecting passage 60, and the pressure relief structure 30 is connected to the connecting passage 60.

[0213] That is, one pressure relief structure 30 can correspond to multiple exhaust passages 50, and the pressure relief structure 30 is connected to the multiple exhaust passages 50 through the connecting passage 60.

[0214] Of course, one part of the pressure relief structure 30 can correspond to one exhaust passage 50, and another part of the pressure relief structure 30 can correspond to multiple exhaust passages 50.

[0215] Exemplarily, one end of the abutting 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 passage 50 is communicated through the gap, that is, the gap between the end of the abutting portion 221 and the side wall of the box assembly 20 forms a connecting passage 60.

[0216] Here, when the battery device 100 has low energy or low exhaust requirement, in order to save cost, one end of multiple exhaust passages 50 can be communicated through the connecting passage 60, so that the gas in multiple exhaust passages 50 can be exhausted through one pressure relief structure 30, thereby reducing the number of pressure relief structures 30, reducing the manufacturing cost and improving the assembly efficiency.

[0217] In some embodiments, referring to Figures 2 to 5 The box assembly 20 includes a frame 21 and a cover plate 22 arranged on the frame 21, and the cover plate 22 and the frame 21 form a containing 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, and the bottom plate 215 is arranged opposite to the cover plate along the height direction of the box assembly 20. The first end plate 211 and the second end plate 212 are arranged opposite along a first direction, and the first side plate and the second side plate are arranged opposite along a second direction, and 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 is configured as a first wall 23. The battery monomer 11 is carried on the bottom plate 215, and the first end plate 211, the second end plate 212, the first side plate 213 and the second side plate 214 all contact the battery monomer 11.

[0218] Exemplarily, the battery monomers 11 in the same battery pack 10 are arranged in a form that the first surfaces 111 are opposite, for example, the battery monomers 11 in the same battery pack 10 are arranged along a first direction, and the first surfaces 111 of the battery monomers 11 in the same battery pack 10 are substantially perpendicular to the first direction. The first surface 111 of the battery monomer 11 refers to the surface with the largest area among the multiple surfaces of the battery monomer 11.

[0219] Exemplarily, the battery monomer 11 includes a shell and an electrode assembly located in the shell.

[0220] Exemplarily, the electrode assembly is a laminated structure, and the positive electrode, the negative electrode and the separator in the electrode assembly are arranged along a first direction.

[0221] Exemplarily, the electrode assembly is in a winding structure, the electrode assembly has a flat area and a corner area, the positive electrode, the negative electrode and the separator located in the flat area are arranged along a first direction.

[0222] Exemplarily, the expansion degree of the battery cell 11 along the arrangement direction of the positive electrode, the negative electrode and the separator is greater than the expansion degree of the battery cell 11 along the cross direction of the arrangement direction of the positive electrode, the negative electrode and the separator. For example, the expansion degree of the battery cell 11 along the first direction is greater than the expansion degree of the battery cell 11 along the second direction, and the expansion degree of the battery cell 11 along the first direction is greater than the expansion degree of the height direction of the battery box assembly 20.

[0223] 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 being able to strengthen the strength of the first end plate 211 and / or the second end plate 212.

[0224] Exemplarily, along the first direction, the side of the first end plate 211 and / or the second end plate 212 away from the accommodating cavity has a reinforcing rib, thereby not only being able to strengthen the strength of the first end plate 211 and / or the second end plate 212, but also being able to not occupy the space inside the battery box.

[0225] Exemplarily, the number of reinforcing ribs is multiple, and the multiple reinforcing ribs are cross arranged.

[0226] Exemplarily, the first end plate 211 and / or the second end plate 212 is of a metal material.

[0227] Exemplarily, the first end plate 211 and / or the second end plate 212 can correspond to an expansion beam, 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, for resisting the expansion force of the battery cell 11 along the first direction.

[0228] The first surface 111 of 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 opposite to each other along the first direction, and arranging the first surface 111 perpendicular to the first direction, thereby 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, and can reduce the probability or the degree of deformation of the first surface 111 due to the increase of the pressure in the battery cell 11 caused by the charging and / or discharging of the battery cell 11, and further reduce the probability or the degree of deformation of the battery device 100.

[0229] 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 cell 11, the overall assembly efficiency and the volume energy density of the battery device 100 can be greatly improved.

[0230] Exemplarily, the bottom plate 215 is internally provided with a heat exchange medium flow channel.

[0231] Therefore, the bottom plate 215 has the functions of bearing the battery monomer 11 and performing thermal management, which is conducive 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.

[0232] In the description of the present disclosure, the description of the terms "in an embodiment", "in some embodiments", "in another embodiment", "in yet another embodiment", or "exemplarily" and the like means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the embodiments of the present disclosure. In the present disclosure, the exemplary description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine different embodiments or examples described in the present disclosure and the features of different embodiments or examples without contradiction.

[0233] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. Those skilled in the art can make various modifications and changes to the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present disclosure is included in the protection scope of the present disclosure.

Claims

1. A battery device, characterized in that: include: A box assembly is provided with a sealed accommodating cavity, the box assembly has a first wall, the first wall has a mounting channel, and has a first wall surface facing the accommodating cavity and a second wall surface facing away from the accommodating cavity; a plurality of battery cells, wherein the plurality of battery cells are disposed in the accommodating cavity; A pressure relief structure is sealed in the mounting channel and is tilted along the thickness direction of the first wall. The end of the pressure relief structure close to the accommodating cavity does not exceed the first wall surface, and the end away from the accommodating cavity does not exceed the second wall surface. The pressure relief structure is an explosion-proof valve.

2. The battery device according to claim 1, wherein: 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 or 2, 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.

4. The battery device according to claim 3, 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.

5. The battery device according to claim 4, characterized in that The first connecting section is threadedly connected to the first wall.

6. The battery device according to claim 4, characterized in that The battery device includes a seal member, which is sealingly sandwiched between the first mating surface and the step surface.

7. The battery device according to claim 5, characterized in that 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.

8. The battery device according to claim 1 or 2, 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.

9. The battery device according to claim 1 or 2, 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.

10. The battery device according to claim 9, 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.

11. The battery device according to claim 10, characterized in that The cover plate protrudes toward the battery cell to form the abutting portion; and / or, The contact portion is connected to the battery cell.

12. The battery device according to claim 10, 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.

13. The battery device according to claim 10, 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.

14. The battery device according to claim 9, wherein: The exhaust channels are arranged at intervals, and the exhaust channels correspond to the pressure relief structures one by one.

15. The battery device according to claim 9, wherein: 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.

16. The battery device according to claim 1 or 2, 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.

17. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1 to 16.

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