Battery device and electric device

Abstract

The application provides a battery device and an electric device. The battery device comprises a box body, a battery monomer group and a heat shield. A plurality of battery monomers in the battery monomer group are arranged in a first direction. A first wall body of the heat shield covers an outer side of the battery monomer group in a second direction. A second wall body covers an outer side of the battery monomer group in a third direction. The third direction, the second direction and the first direction are perpendicular to each other. The first wall body is provided with a first exhaust structure. The second wall body is provided with a second exhaust structure. An exhaust gap is arranged between the heat shield and the battery monomer group. The exhaust gap is communicated with the first exhaust structure and the second exhaust structure. The venting substances discharged by the battery monomers can be discharged in different directions through the first exhaust structure and the second exhaust structure, thereby realizing the shunting of the venting substances. Compared with the venting substances being discharged in a specific direction, the impact force of the venting substances can be reduced, and the possibility of damage of other components in the battery device is reduced.

Description

Technical Field

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

[0002] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] As the application scope of battery devices continues to expand, the requirements for the reliability of battery devices are becoming increasingly stringent. How to improve the reliability of battery devices is receiving increasing attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, this application provides a battery device and an electrical device, the battery device having good reliability.

[0005] In a first aspect, some embodiments of this application provide a battery device, which includes a housing, a battery cell assembly, and a heat shield. The battery cell assembly is housed in the housing and includes a plurality of battery cells stacked along a first direction. The heat shield includes a first wall and a second wall connected to each other. The first wall covers the battery cell assembly on the outside in a second direction, and the second wall covers the battery cell assembly on the outside in a third direction. The third direction, the second direction, and the first direction are perpendicular to each other. The first wall is provided with a first venting structure, and the second wall is provided with a second venting structure penetrating the second wall along its thickness direction. A venting gap is provided between the heat shield and the battery cell assembly, and the venting gap communicates with the first venting structure and the second venting structure.

[0006] In the above structure, the first wall of the heat shield covers the outer side of the battery cell group in the second direction, and the second wall covers the outer side of the battery cell group in the third direction. This effectively blocks the outward diffusion of heat from the battery cell group, reducing the possibility of heat from a thermally runaway battery cell group spreading to surrounding battery cell groups. Since the first wall has a first venting structure and the second wall has a second venting structure, and when the battery cell is under depressurization, the second venting structure and the first venting structure are connected, allowing the discharged substances from the battery cell to be discharged in different directions through the first and second venting structures. This achieves the diversion of discharged substances. Compared to the discharge of all discharged substances along a specific direction, this reduces the impact force of the discharged substances, decreases the possibility of damage to other components in the battery device, and improves the reliability of the battery device.

[0007] According to some embodiments of the present application, the battery cell includes a casing and a pressure relief mechanism. The first venting structure includes a first channel penetrating the first wall along the thickness direction of the first wall, and the second venting structure includes a second channel penetrating the second wall along the thickness direction of the second wall, so that the high-temperature gas and other venting substances discharged by the battery cell can be discharged more smoothly from the space between the two second walls to the outside of the heat insulation cover.

[0008] According to some embodiments of the present application, the battery cell includes a housing and a pressure relief mechanism. The housing includes a wall portion close to the first wall in a second direction. The pressure relief mechanism is disposed on the wall portion, such that the pressure relief mechanism is disposed on the wall structure of the housing facing the first wall, so that the released material discharged by the pressure relief mechanism can be closer to the first exhaust structure, which helps to be discharged to the outside of the heat insulation cover in a timely manner through the first exhaust structure.

[0009] According to some embodiments of the present application, in the battery device, at least a portion of the orthographic projection of the pressure relief mechanism overlaps with the orthographic projection of the first exhaust structure on a plane perpendicular to the second direction, so that the vented material discharged from the pressure relief mechanism can enter the first exhaust structure more directly and quickly for external discharge.

[0010] According to some embodiments of the present application, in the battery device, at least a portion of the orthographic projection of the pressure relief mechanism of at least two battery cells overlaps with the orthographic projection of the same first exhaust structure on a plane perpendicular to the second direction. This can reduce the number of first exhaust structures provided on the first wall and reduce the reduction in the strength of the heat insulation cover structure caused by the provision of more first exhaust structures on the first wall.

[0011] According to some embodiments of the present application, the battery device further includes an electrode terminal protruding from the wall portion, and the battery device further includes a sampling member having an outlet hole and a clearance hole. The sampling member is disposed between the wall portion and the first wall body, and at least a portion of the electrode terminal extends into the outlet hole. On a plane perpendicular to the second direction, at least a portion of the orthographic projection of the pressure relief mechanism overlaps with the orthographic projection of the clearance hole. The sampling member and the first wall body are spaced apart to form a first exhaust channel. After the venting material discharged by the pressure relief mechanism flows to the first exhaust channel, it can flow along the extension direction of the first exhaust channel. The venting material can be discharged outward through a plurality of first exhaust structures and second exhaust structures connected to the first exhaust channel, thereby reducing the impact force of the venting material being discharged outward from the heat insulation cover.

[0012] According to some embodiments of the present application, the battery device has a protective structural layer on the surface of the sampling member facing the wall, which can reduce the impact of the released substances on the sampling member and reduce the possibility of damage to the sampling member.

[0013] According to some embodiments of the present application, the battery device has a cross-sectional area of ​​M1 for the first exhaust structure on a plane perpendicular to the second direction, and an effective opening area of ​​M3 for the pressure relief mechanism, where 0.4≤M1 / M3≤0.9. This not only enables the first wall on the outer periphery of the first exhaust structure to effectively block the discharged material discharged by the pressure relief mechanism and reduce the flow rate of the discharged material, but also enables the first exhaust structure to quickly discharge the discharged material to the outside of the heat insulation cover, reducing the possibility of the discharged material accumulating inside the heat insulation cover.

[0014] According to some embodiments of the present application, the cross-sectional shape of the first exhaust structure in the plane perpendicular to the second direction is set to L in the third direction, and the cross-sectional shape of the first exhaust structure in the plane perpendicular to the second direction is set to W in the first direction, 3≤L / W≤10, so that the first exhaust structure can reduce the flow rate of the discharged material while also allowing the discharged material to be smoothly discharged to the outside of the heat insulation cover.

[0015] According to some embodiments of the present application, the battery device is provided on the second wall with a discharge structure, the discharge structure including a connecting part and a channel part, the connecting part and the channel part being connected to form an annular structure; the channel part is provided with a second exhaust structure, the second exhaust structure extending along the extension direction of the channel part, or the second exhaust structure includes a plurality of sub-channels spaced apart along the extension direction of the channel part.

[0016] According to some embodiments of the present application, the battery device has a cross-sectional area of ​​M1 for the first exhaust structure on a plane perpendicular to the second direction, and a cross-sectional area of ​​M2 for the second exhaust structure on a plane perpendicular to the third direction, where 0.4 ≤ M2 / M1 ≤ 1. This not only allows the discharged material to be discharged mainly from the first exhaust structure to the outside of the heat shield, reducing the resistance encountered when the discharged material is discharged outward, but also ensures that the effective flow cross-sectional area of ​​the second exhaust structure is not too small, and that the second exhaust structure can effectively divert the discharged material.

[0017] According to some embodiments of the battery device provided in this application, in the third direction, the distance between the first exhaust structure and the connection between the first wall and the second wall is D1, where D1 ≥ 2.5 mm; in the second direction, the distance between the second exhaust structure and the connection between the first wall and the second wall is D2, where D2 ≥ 2.5 mm. This makes it less likely that the first exhaust structure and the second exhaust structure will be too close to the connection between the first wall and the second wall, thereby reducing the possibility of stress concentration at the first exhaust structure and reducing the possibility of cracks or other damage to the first wall around the first exhaust structure.

[0018] According to some embodiments of the present application, the battery device is provided with at least two first walls, which are stacked along a second direction. The first exhaust structures on the at least two first walls are staggered along a direction perpendicular to the second direction. This not only improves the tear resistance redundancy of the heat shield, but also allows the staggered first exhaust structures to extend the path length of the discharged material through the heat insulation member, which is beneficial to slow down the flow rate of the discharged material.

[0019] According to some embodiments of the present application, the battery device has multiple second exhaust structures, which are spaced apart along a first direction. In the first direction, the size of the second exhaust structure is set to E1, and the interval between two adjacent second exhaust structures is set to E2. E2 / E1≥1.5, which is beneficial to give the second wall good structural strength.

[0020] According to some embodiments of the present application, the battery device provides at least two battery cell groups, which are arranged at intervals along a third direction. Two adjacent heat shields are spaced apart to form a second exhaust channel. The second exhaust structure is connected to the second exhaust channel, so that the vented substances discharged from the second exhaust structure can be conveniently discharged to the outside of the box through the second exhaust channel.

[0021] According to some embodiments of the present application, the battery device provided has a first wall and a second wall as an integrally formed structure, which not only makes the heat shield easy to process and manufacture, but also gives the overall structure of the heat shield good strength.

[0022] Secondly, some embodiments of this application provide an electrical device that includes a battery device provided by any of the above-described technical solutions, the battery device being used to provide electrical energy.

[0023] The technical solutions provided by the embodiments of this application bring at least the following beneficial effects: Some embodiments of this application provide a battery device, which includes a housing, a battery cell assembly, and a heat shield. The battery cell assembly is housed in the housing and includes a plurality of battery cells stacked along a first direction. The heat shield includes a first wall and a second wall connected to each other. The first wall covers the battery cell assembly on the outside in a second direction, and the second wall covers the battery cell assembly on the outside in a third direction. The third direction, the second direction, and the first direction are perpendicular to each other. The first wall is provided with a first venting structure, and the second wall is provided with a second venting structure. A venting gap is provided between the heat shield and the battery cell assembly, and the venting gap communicates with the first venting structure and the second venting structure.

[0024] In the above structure, the first wall of the heat shield covers the outer side of the battery cell group in the second direction, and the second wall covers the outer side of the battery cell group in the third direction. This effectively blocks the outward diffusion of heat from the battery cell group, reducing the possibility of heat from a thermally runaway battery cell group spreading to surrounding battery cell groups. Because the first wall has a first venting structure and the second wall has a second venting structure, and these two structures are connected by a venting gap, the released substances from the battery cells can be discharged in different directions through the first and second venting structures. This diversion of the released substances, compared to the release of all substances along a specific direction, reduces the impact force of the released substances, decreases the possibility of damage to other components in the battery device, and improves the reliability of the battery device. Attached Figure Description

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of a vehicle provided for some embodiments of this application; Figure 2 Exploded views of the battery device provided in some embodiments of this application; Figure 3 This is a schematic diagram of the structure of some battery devices provided in some embodiments of this application; Figure 4 for Figure 3 Schematic diagram of the internal structure at HH; Figure 5 for Figure 4 Enlarged view at point F; Figure 6 This is a split schematic diagram of a portion of the battery device provided in some embodiments of this application; Figure 7 For some embodiments of this application Figure 3 Enlarged view of point G in the middle; Figure 8 For other embodiments of this application Figure 3 Enlarged view of point G in the middle; Figure 9 This is a top view of a portion of the battery device provided in some embodiments of this application.

[0026] In the picture: 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Accommodation space; 7. Battery cell; 711. Wall section; 72. Pressure relief mechanism; 73. Electrode terminal; 70. Battery cell group; 8. Heat shield; 81. First wall section; 811. First exhaust structure; 82. Second wall section; 821. Second exhaust structure; 8211. Sub-channel; 822. Exhaust structure; 8221. Connecting part; 8222. Channel section; 9. Sampling component; 91. Outlet hole; 93. Sampling terminal; 94. Sampling plate; 10. First exhaust channel; 11. Second exhaust channel; 12. Insulating plate; 13. Combining component; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0027] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0028] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0029] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0030] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0031] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0032] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in energy storage containers or energy storage cabinets. As the application fields of battery devices continue to expand, the requirements for their reliability are also constantly increasing.

[0034] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which may be connected in series, parallel, or a combination thereof.

[0035] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0036] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0037] Battery cells can be lithium-ion cells, sodium-ion cells, sodium-lithium-ion cells, lithium metal cells, sodium metal cells, lithium-sulfur cells, magnesium-ion cells, nickel-metal hydride cells, nickel-cadmium cells, lead-acid cells, etc.

[0038] As an example, a battery cell group can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0039] In some embodiments, the battery device may include one or more battery packs, which may include one or more battery cell groups. As an example, a battery pack includes a housing and one or more battery cell groups, the battery cell groups being housed within the housing, for example, by a fixed arrangement. As yet another example, the battery device may include multiple battery packs, which may be connected in series, parallel, or in a mixed configuration.

[0040] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the battery cell pack. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0041] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the battery cells.

[0042] In some embodiments, the battery device can be used in an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0043] As high-energy-density devices, battery devices have always been a focus of attention regarding their reliability. Thermal runaway, as an event that seriously affects the reliability of battery devices, has always been something that those skilled in the art strive to avoid. When a single battery cell experiences thermal runaway, the diffusion of heat can easily trigger thermal runaway in surrounding cells, causing the thermal runaway to spread throughout the battery device and lead to serious consequences. In some cases, to mitigate heat diffusion, the outer side of the battery cell assembly is covered with a heat-insulating component. This component has an exhaust structure located directly opposite the battery cell's pressure relief mechanism. When a battery cell is depressurized and vented, high-temperature gases and other released substances are ejected from the exhaust structure. Due to the significant impact force of the released substances, the impact can easily damage components such as sampling plates and wiring harnesses within the battery device, which is detrimental to improving the reliability of the battery device.

[0044] To improve the reliability of the battery device, some embodiments of this application provide a battery device including a housing, a battery cell assembly, and a heat shield. The battery cell assembly is housed in the housing and includes multiple battery cells stacked along a first direction. The heat shield includes a first wall and a second wall connected to each other. The first wall covers the battery cell assembly on the outside in a second direction, and the second wall covers the battery cell assembly on the outside in a third direction. The third direction, the second direction, and the first direction are perpendicular to each other. The first wall is provided with a first venting structure that penetrates the first wall along its thickness direction, and the second wall is provided with a second venting structure that penetrates the second wall along its thickness direction. When the battery cells are in a depressurized state, the second venting structure and the first venting structure are connected.

[0045] In the above structure, the first wall of the heat shield covers the outer side of the battery cell group in the second direction, and the second wall covers the outer side of the battery cell group in the third direction. This effectively blocks the outward diffusion of heat from the battery cell group, reducing the possibility of heat from a thermally runaway battery cell group spreading to surrounding battery cell groups. Because the first wall has a first venting structure and the second wall has a second venting structure, and these two structures are connected by a venting gap, the released substances from the battery cells can be discharged in different directions through the first and second venting structures. This diversion of the released substances, compared to the release of all substances along a specific direction, reduces the impact force of the released substances, decreases the possibility of damage to other components in the battery device, and improves the reliability of the battery device.

[0046] The battery device described in the embodiments of this application is applicable to electrical devices that use battery devices.

[0047] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0048] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0049] Figure 1 A schematic diagram of a vehicle provided for some embodiments of this application.

[0050] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0051] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0052] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0053] Figure 2 This is a schematic diagram showing the disassembled structure of a battery device provided in some embodiments of this application. For example... Figure 2 As shown, the battery device 2 includes a housing 5 and a battery cell assembly 70, which is housed within the housing 5. The battery cell assembly 70 may include multiple battery cells, and the battery elevator may be the smallest unit that makes up the battery.

[0054] The housing 5 is used to house the battery cell pack 70, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a housing space 5c for housing the battery cell pack 70. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0055] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0056] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0057] Some embodiments of this application provide a battery device 2, which includes a housing 5, a battery cell pack 70, and a heat shield 8. The battery cell pack 70 is housed in the housing 5. (See reference...) Figure 3 The battery cell pack 70 includes a plurality of battery cells 7 stacked along the first direction X; Reference Figure 3 , Figure 4 and Figure 5 The heat shield 8 includes a first wall 81 and a second wall 82 connected to each other. The first wall 81 covers the outer side of the battery cell group 70 in the second direction Y, and the second wall 82 covers the outer side of the battery cell group 70 in the third direction Z. The third direction Z, the second direction Y, and the first direction X are perpendicular to each other. The first wall 81 is provided with a first exhaust structure 811, and the second wall 82 is provided with a second exhaust structure 821. An exhaust gap is provided between the heat shield 8 and the battery cell group 70, and the exhaust gap communicates with the first exhaust structure 811 and the second exhaust structure 821.

[0058] The housing 5 can be a component for providing a receiving space 5c, which is used to accommodate components such as battery cells 7, heat shields 8, sampling components 9, heat exchange devices, and wiring harnesses located inside the battery device 2, so that the housing 5 can provide protection for the battery cells 7, heat shields 8, sampling components 9, heat exchange devices, wiring harnesses, and other devices.

[0059] The battery cell pack 70 can be an assembly comprising multiple battery cells 7. The multiple battery cells 7 in the battery cell pack 70 can be connected in series, parallel, or in a mixed configuration. The multiple battery cells 7 in the battery cell pack 70 are stacked along a first direction X, meaning that the multiple battery cells 7 are stacked sequentially along the thickness direction of the battery cells 7, where the first direction X is the thickness direction of the battery cells 7, allowing the multiple battery cells 7 to be stacked along their own thickness direction to form an integral structure.

[0060] The housing 5 can accommodate multiple battery cell groups 70, which can be connected in series, parallel or mixed via conductive components.

[0061] Battery cell 7 can be a rechargeable battery cell, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. Battery cell 7 can be a lithium-ion battery cell, sodium-ion battery cell, sodium-lithium-ion battery cell, lithium metal battery cell, sodium metal battery cell, lithium-sulfur battery cell, magnesium-ion battery cell, nickel-metal hydride battery cell, nickel-cadmium battery cell, lead-acid battery cell, etc.

[0062] The battery cell pack 70 is housed in the housing space 5c of the housing 5, which protects the battery cell 7 and makes it less susceptible to changes in the external environment, thus improving the operational stability of the battery cell 7.

[0063] The heat shield 8 can be a heat-insulating shell structure used to cover the outside of the battery cell pack 70. By setting the heat shield 8 in the housing 5 and covering the outside of the battery cell pack 70, the heat generated by the battery cells 7 in the battery cell pack 70 can be blocked by the heat shield 8 when it diffuses outward, thus slowing down the heat diffusion.

[0064] For example, the heat insulation cover 8 may be made of materials with heat insulation capabilities such as mica board, ceramic fiber board, and aluminum silicate fiber board.

[0065] The first wall 81 and the second wall 82 are two interconnected wall structures within the heat shield 8. Specifically, the first wall 81 is the wall structure of the heat shield 8 covering the outer side of the battery cell assembly 70 in the second direction Y, and the second wall 82 is the wall structure of the heat shield 8 covering the outer side of the battery cell assembly 70 in the third direction Z. The third direction Z, the second direction Y, and the first direction X intersect each other but are not coplanar; this can mean that the third direction Z, the second direction Y, and the first direction X are arranged perpendicularly to each other.

[0066] For example, the heat shield 8 may include a first wall 81 and two second walls 82, the two second walls 82 being spaced apart along a third direction Z, the first wall 81 being connected between the two second walls 82, such that a space capable of accommodating the battery cell assembly 70 is formed between the two second walls 82, the battery cell assembly 70 being located in this space and covered by the heat shield 8, and the heat generated by the battery cells 7 in the battery cell assembly 70 is not easily diffused to the battery cells 7 outside the heat shield 8.

[0067] In another example, the heat shield 8 may include two first walls 81 and two second walls 82, the two second walls 82 being spaced apart along a third direction Z, and the two first walls 81 being spaced apart along a second direction Y. The first walls 81 are connected between the two second walls 82, such that a space capable of accommodating the battery cell assembly 70 is formed between the two second walls 82 and the two first walls 81, and the battery cell assembly 70 is located in this space and is covered by the heat shield 8.

[0068] For example, the first wall 81 is fixed to the housing 5 by adhesive or clips, and the second wall 82 is connected to the side of the battery cell group 70 by claws or attached to the side of the battery cell group 70 by a press-fit structure.

[0069] The first venting structure 811 can be a structure provided on the first wall 81 for discharging released substances. When the battery cell 7 discharges released substances, the released substances can be discharged to the outside of the first wall 81 through the first venting structure 811. For example, the first venting structure 811 can be a thinned area provided on the first wall 81. When the battery cell 7 discharges released substances, the first venting structure 811 is damaged by the impact of the released substances, allowing the released substances to pass through the first venting structure 811 and be discharged to the outside of the first wall 81. In another example, the first venting structure 811 can be a through-channel structure provided on the first wall 81, allowing the released substances to pass smoothly through the first wall 81 when the battery cell 7 discharges released substances.

[0070] The second venting structure 821 can be a structure provided on the second wall 82 for discharging discharged substances. When the battery cell 7 discharges discharged substances, the discharged substances can be discharged to the outside of the second wall 82 through the second venting structure 821. For example, the second venting structure 821 can be a thinned area provided on the second wall 82. When the battery cell 7 discharges discharged substances, the second venting structure 821 is damaged by the impact of the discharged substances, allowing the discharged substances to pass through the second venting structure 821 and be discharged to the outside of the second wall 82. In another example, the second venting structure 821 can be a through-channel structure provided on the second wall 82, allowing the discharged substances to pass smoothly through the second wall 82 when the battery cell 7 discharges discharged substances.

[0071] The exhaust gap can be the gap formed between the heat shield 8 and the battery cell assembly 70. It connects the first exhaust structure 811 and the second exhaust structure 821, ensuring they are in a connected state. High-temperature gases and other venting substances discharged from the battery cell 7 can reach both the first and second exhaust structures 811 and 821 through this gap. High-temperature gases and other venting substances in the space between the two second walls 82 can be discharged outwards in two mutually perpendicular directions through the second exhaust structure 821 and the first exhaust structure 811, achieving diverted discharge of these substances. Compared to venting all substances in a specific direction, diverted discharge reduces the flow velocity and impact force of the venting substances, decreasing the impact on the components in the battery device 2 and reducing the possibility of damage, thus improving the reliability of the battery device 2.

[0072] For example, the battery cell group 70 may be spaced between the third-direction Z-side and the second wall 82, with an exhaust gap. The second exhaust structure 821 of the second wall 82 is connected to the first exhaust structure 811 through the exhaust gap. Part of the vented material discharged from the battery cell 7 is discharged to the outside of the heat shield 8 through the first exhaust structure 811, and the other part flows to the second exhaust structure 821 through the exhaust gap between the battery cell group 70 and the second wall 82, and is then discharged to the outside of the heat shield 8 through the second exhaust structure 821.

[0073] In another example, the battery cell assembly 70 can be fitted against the second wall 82 on the Z-direction side. When the battery cell 7 discharges effluent, the effluent causes the second wall 82 to bulge outwards from the battery cell assembly 70, forming an exhaust gap between the battery cell assembly 70 and the second wall 82. The effluent can flow through this exhaust gap to the second exhaust structure 821. It is understood that although the battery cell assembly 70 and the second wall 82 are fitted together, there are gaps such as installation gaps between them. After the effluent fills these gaps, it will open them, causing the second wall 82 to bulge outwards from the battery cell assembly 70. This gap forms an exhaust gap for better passage of the effluent.

[0074] In the above structure, the first wall 81 of the heat shield 8 covers the outer side of the battery cell group 70 in the second direction Y, and the second wall 82 covers the outer side of the battery cell group 70 in the third direction Z. This can block the outward diffusion of heat from the battery cell group 70, reducing the possibility of heat from the thermally runaway battery cell group 70 spreading to surrounding battery cell groups 70. Since the first wall 81 is provided with a first exhaust structure 811 and the second wall 82 is provided with a second exhaust structure 821, and the second exhaust structure 821 and the first exhaust structure 811 are connected through an exhaust gap, the discharged substances emitted by the battery cell 7 can be discharged in different directions through the first exhaust structure 811 and the second exhaust structure 821. This achieves the diversion of the discharged substances. Compared with the discharge of all the discharged substances along a specific direction, it can reduce the impact force of the discharged substances, reduce the possibility of damage to other components in the battery device 2, and help improve the reliability of the battery device 2.

[0075] In some embodiments, the first exhaust structure 811 includes a first channel extending through the first wall 81 along the thickness direction of the first wall 81, and the second exhaust structure 821 includes a second channel extending through the second wall 82 along the thickness direction of the second wall 82.

[0076] By setting the first exhaust structure 811 to penetrate the first wall 81 along the thickness direction of the first wall 81, the high-temperature gas and other released substances discharged by the battery cell 7 can smoothly pass through the first wall 81 through the first exhaust structure 811.

[0077] By setting the second exhaust structure 821 to penetrate the second wall 82 along the thickness direction of the second wall 82, the high-temperature gas and other venting substances discharged by the battery cell 7 can smoothly pass through the second wall 82 through the second exhaust structure 821, so that the high-temperature gas and other venting substances discharged by the battery cell 7 can be smoothly discharged from the space between the two second walls 82 to the outside of the heat insulation cover 8.

[0078] In some embodiments, reference Figure 4 and Figure 5 The battery cell 7 includes a housing and a pressure relief mechanism 72. The housing includes a wall portion 711 near the first wall 81 in the second direction Y, and the pressure relief mechanism 72 is disposed on the wall portion 711.

[0079] The outer casing can be a component in the battery cell 7 used to form a sealed space, which is a structure for accommodating other components such as electrode assemblies in the battery cell 7. The wall portion 711 is a partial wall structure in the outer casing, which is a wall structure in the outer casing close to the first wall 81 in the second direction Y.

[0080] The pressure relief mechanism 72 is used to discharge internal gases and other vented substances from the battery cell 7. The pressure relief mechanism 72 is disposed on the wall portion 711, such that the pressure relief mechanism 72 is disposed on the wall structure of the outer casing facing the first wall body 81, so that the vented substances discharged by the pressure relief mechanism 72 can be relatively close to the first exhaust structure 811, which helps to be discharged to the outside of the heat insulation cover 8 in a timely manner through the first exhaust structure 811.

[0081] As an example, the internal pressure or temperature of the battery cell 7 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 7 reaches the predetermined threshold, the pressure relief mechanism 72 is activated or a weak structure provided in the pressure relief mechanism 72 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 7.

[0082] As an example, the pressure relief mechanism 72 can be integrally formed with the wall portion 711.

[0083] As an example, the pressure relief mechanism 72 can also be separately installed and connected to the wall portion 711.

[0084] The term "actuation" as used in this application refers to the pressure relief mechanism 72 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 7. The actions of the pressure relief mechanism 72 may include, but are not limited to: movement of components within the pressure relief mechanism 72 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 72, etc. When the pressure relief mechanism 72 is actuated, the high-temperature, high-pressure substances inside the battery cell 7 are discharged outwards from the actuated portion as venting substances. This method enables pressure and temperature relief of the battery cell 7 under controllable pressure or temperature, thereby preventing potentially more serious accidents.

[0085] In some embodiments, at least a portion of the orthographic projection of the pressure relief mechanism 72 overlaps with the orthographic projection of the first exhaust structure 811 in a plane perpendicular to the second direction Y.

[0086] At least a portion of the orthographic projection of the pressure relief mechanism 72 on the plane perpendicular to the second direction Y overlaps with the orthographic projection of the first exhaust structure 811. This can mean that a portion of the orthographic projection of the pressure relief mechanism 72 on the plane perpendicular to the second direction Y overlaps with the orthographic projection of the first exhaust structure 811, allowing some of the released material discharged from the pressure relief mechanism 72 to directly and quickly enter the first exhaust structure 811 for external discharge, while another portion of the released material is blocked by the first wall 81 on the outer periphery of the first exhaust structure 811, reducing its flow velocity before being discharged externally through the first exhaust structure 811. Alternatively, it can mean that the orthographic projection of the pressure relief mechanism 72 on the plane perpendicular to the second direction Y completely overlaps with the orthographic projection of the first exhaust structure 811, allowing the released material discharged from the pressure relief mechanism 72 to enter the first exhaust structure 811 for external discharge more directly and quickly.

[0087] By setting at least a portion of the orthogonal projection of the pressure relief mechanism 72 on a plane perpendicular to the second direction Y to overlap with the orthogonal projection of the first exhaust structure 811, the vented material discharged from the pressure relief mechanism 72 can be discharged more smoothly through the first exhaust structure 811.

[0088] In some embodiments, on a plane perpendicular to the second direction Y, at least a portion of the orthographic projection of the pressure relief mechanism 72 of at least two battery cells 7 overlaps with the orthographic projection of the same first exhaust structure 811.

[0089] By overlapping at least a portion of the orthographic projection of the pressure relief mechanism 72 of at least two battery cells 7 onto a plane perpendicular to the second direction Y with the orthographic projection of the same first exhaust structure 811 onto a plane perpendicular to the second direction Y, one first exhaust structure 811 can correspond to the pressure relief mechanism 72 of at least two battery cells 7. This reduces the number of first exhaust structures 811 provided on the first wall 81 and reduces the structural strength reduction of the heat insulation cover 8 caused by providing a large number of first exhaust structures 811 on the first wall 81.

[0090] For example, in the pressure relief mechanism 72 of two adjacent battery cells 7, the orthographic projection of each pressure relief mechanism 72 on the plane perpendicular to the second direction Y partially overlaps with the orthographic projection of the same first exhaust structure 811 on the plane perpendicular to the second direction Y. This not only allows one first exhaust structure 811 to be set for two pressure relief mechanisms 72 of two battery cells 7, but also allows the first wall 81 on the outer periphery of the first exhaust structure 811 to block part of the discharged material discharged by the pressure relief mechanism 72 of the two adjacent battery cells 7. The discharged material is discharged outward through the first exhaust structure 811 after the flow rate is reduced.

[0091] In some other embodiments, the number of first exhaust structures 811 provided on the first wall 81 can be equal to the number of battery cells 7 in the battery cell group 70, and the first exhaust structures 811 and the pressure relief mechanisms 72 in the battery cells 7 are provided in a one-to-one correspondence.

[0092] In some embodiments, the battery cell 7 further includes an electrode terminal 73 protruding from the wall portion 711, and the battery device 2 further includes a sampling member 9 having an outlet hole 91 and a clearance hole, the sampling member 9 being disposed between the wall portion 711 and the first wall body 81, and at least a portion of the electrode terminal 73 extending into the outlet hole 91; in a plane perpendicular to the second direction Y, at least a portion of the orthographic projection of the pressure relief mechanism 72 overlaps with the orthographic projection of the clearance hole; continuing to refer to Figure 5 The sampling element 9 is spaced apart from the first wall 81 to form the first exhaust channel 10.

[0093] Electrode terminal 73 may be a component provided in the battery cell 7 for leading current out of or introducing current into the electrode assembly. (See reference) Figure 6 The sampling element 9 can be a device equipped with sampling terminals 93, disposed between the wall portion 711 and the first wall body 81. The sampling element 9 can be electrically connected to the electrode terminals 73 of the battery cell 7 through the sampling terminals 93, and can collect information such as the current and voltage of the battery cell 7. For example, the sampling element 9 can include a sampling board 94 and sampling terminals 93 connected to the sampling board 94. The sampling terminals 93 can be electrically connected to the circuit board, so that the current, voltage, and other information of the battery cell 7 can be transmitted to the battery management system.

[0094] The lead-out hole 91 can be a hole-like structure provided on the sampling member 9 for accommodating at least a portion of the electrode terminal 73. Exemplarily, the lead-out hole 91 extends through the sampling member 9 along the second direction Y, allowing the electrode terminal 73 protruding from the wall portion 711 to extend through the lead-out hole 91, facilitating the connection between the sampling terminal 93 in the sampling member 9 and the electrode terminal 73. Alternatively, the sampling member 9 can be provided with a busbar component 13, which is connected to the portion of the electrode terminal 73 extending from the lead-out hole 91 to connect the battery cells 7 in series, parallel, or mixed connections. The sampling terminal 93 is connected to the busbar component 13 for electrical connection with the electrode terminal 73.

[0095] The clearance hole can be a hole-like structure provided on the sampling member 9 to avoid the pressure relief mechanism 72. It penetrates the sampling member 9 along the second direction Y, so that the venting material discharged by the pressure relief mechanism 72 can pass through the clearance hole to reach the first exhaust structure 811.

[0096] At least a portion of the orthographic projection of the pressure relief mechanism 72 on a plane perpendicular to the second direction Y overlaps with the orthographic projection of the clearance hole on the same plane. This can mean that a portion of the orthographic projection of the pressure relief mechanism 72 on the same plane overlaps with the orthographic projection of the clearance hole on the same plane, and the sampling element 9 on the outer periphery of the clearance hole can block the flow of part of the discharged material discharged by the pressure relief mechanism 72, reducing the flow rate of the discharged material. Alternatively, it can mean that the entire orthographic projection of the pressure relief mechanism 72 on the same plane overlaps with the orthographic projection of the clearance hole on the same plane, and the discharged material discharged by the pressure relief mechanism 72 can pass through the clearance hole more directly and quickly.

[0097] The sampling element 9 is spaced apart from the first wall 81 to form a first exhaust channel 10. This means that the sampling element 9 and the first wall 81 are spaced apart, with the space between them forming the first exhaust channel 10. The first exhaust channel 10 communicates with the first exhaust structure 811 and with the pressure relief mechanism 72 through a clearance hole, allowing the released material discharged by the pressure relief mechanism 72 to flow through the first exhaust channel 10 to the first exhaust structure 811. For example, the first exhaust channel 10 extends along a first direction X. After flowing to the first exhaust channel 10, the released material discharged by the pressure relief mechanism 72 can flow along the extension direction of the first exhaust channel 10, allowing the released material to be discharged outward through multiple first exhaust structures 811 and second exhaust structures 821 connected to the first exhaust channel 10, thereby reducing the impact force of the released material being discharged outward from the heat insulation cover 8.

[0098] In some embodiments, an insulating plate 12 is provided on the side of the first wall 81 facing the wall portion 711. The insulating plate 12 may be a component made of insulating material. By providing an insulating plate 12 on the side of the first wall 81 facing the wall portion 711, it is beneficial to reduce the possibility of short circuits in the battery cells 7 in the battery cell pack 70, and to improve the reliability of the battery device 2.

[0099] In some embodiments, a protective structural layer (not shown) is provided on the surface of the sampling member 9 facing the wall portion 711.

[0100] The protective structural layer can refer to a structure used to protect the sampling element 9, which can reduce the impact of the released substances on the sampling element 9 and reduce the possibility of damage to the sampling element 9.

[0101] For example, the protective structural layer can be made of ceramic fiber cloth, which gives the protective structural layer good structural strength and insulation.

[0102] In some embodiments, on a plane perpendicular to the second direction Y, the cross-sectional area of ​​the first exhaust structure 811 is M1, and the effective opening area of ​​the pressure relief mechanism 72 is set to M3, where 0.4≤M1 / M3≤0.9.

[0103] The effective opening area of ​​the pressure relief mechanism 72 can refer to the effective flow cross-sectional area of ​​the released material ejected from the pressure relief mechanism 72 when the pressure relief mechanism 72 is actuated.

[0104] By setting the cross-sectional area of ​​the first exhaust structure 811 on the plane perpendicular to the second direction Y to M1, setting the effective opening area of ​​the pressure relief mechanism 72 to M3, and setting the relationship between the two to M1 / M3≤0.9, the cross-sectional area M1 of the first exhaust structure 811 on the plane perpendicular to the second direction Y is smaller than the effective opening area M3 of the pressure relief mechanism 72. The first wall 81 on the outer periphery of the first exhaust structure 811 can block the discharged material discharged by the pressure relief mechanism 72, and the flow rate of the discharged material can be reduced. By setting the relationship between the cross-sectional area M1 of the first exhaust structure 811 on the plane perpendicular to the second direction Y and the effective opening area M3 of the pressure relief mechanism 72 to M1 / M3≥0.4, the first exhaust structure 811 can effectively discharge the discharged material to the outside of the heat insulation cover 8, reducing the possibility of the discharged material accumulating inside the heat insulation cover 8.

[0105] The relationship between the cross-sectional area M1 of the first exhaust structure 811 on the plane perpendicular to the second direction Y and the effective opening area M3 of the pressure relief mechanism 72 can be set to 0.5 ≤ M1 / M3 ≤ 0.8. For example, the ratio of the cross-sectional area M1 of the first exhaust structure 811 on the plane perpendicular to the second direction Y and the effective opening area M3 of the pressure relief mechanism 72 can be set to 0.5, 0.6, 0.7, or 0.8. This not only allows the first wall 81 on the outer periphery of the first exhaust structure 811 to effectively block the discharged material from the pressure relief mechanism 72, reducing the flow rate of the discharged material, but also allows the first exhaust structure 811 to quickly discharge the discharged material outside the heat insulation cover 8, reducing the possibility of the discharged material accumulating inside the heat insulation cover 8.

[0106] In some embodiments, the cross-sectional shape of the first exhaust structure 811 in the plane perpendicular to the second direction Y is set to L in the third direction Z, and the cross-sectional shape of the first exhaust structure 811 in the plane perpendicular to the second direction Y is set to W in the first direction X, where 3≤L / W≤10.

[0107] By setting the dimension of the cross-sectional shape of the first exhaust structure 811 in the third direction Z on the plane perpendicular to the second direction Y to L, and setting the dimension of the cross-sectional shape of the first exhaust structure 811 in the first direction X on the plane perpendicular to the second direction Y to W, and setting the relationship between the two to L / W≥3, the first exhaust structure 811 becomes a long and narrow channel. This causes local throttling and eddies to occur when the discharged material passes through the first exhaust structure 811, thereby reducing the velocity of the discharged material discharged from the first exhaust structure 811 and reducing the impact force of the discharged material on the device. By setting the ratio of the dimension L of the cross-sectional shape of the first exhaust structure 811 in the third direction Z on the plane perpendicular to the second direction Y to the dimension W of the cross-sectional shape of the first exhaust structure 811 in the first direction X to L / W≤10, the resistance encountered by the discharged material when passing through the first exhaust structure 811 is not too large, allowing the discharged material to pass smoothly through the first exhaust structure 811 and be discharged to the outside of the heat insulation cover 8.

[0108] The ratio of the dimension L of the cross-sectional shape of the first exhaust structure 811 in the third direction Z on the plane perpendicular to the second direction Y to the dimension W of the cross-sectional shape of the first exhaust structure 811 in the first direction X is set to 3≤L / W≤8. For example, the ratio can be set to 3, 4, 5, 6, 7 or 8, so that the first exhaust structure 811 can reduce the flow rate of the discharged material while also allowing the discharged material to be smoothly discharged to the outside of the heat insulation cover 8.

[0109] In some embodiments, reference Figure 7 and Figure 8The second wall 82 is provided with a discharge structure 822, which includes an annular structure. The annular structure includes a connecting part 8221 and a channel part 8222. The channel part 8222 extends circumferentially along the annular structure. The connecting part 8221 connects the two ends of the channel part 8222 in the extending direction. The channel part 8222 is provided with a second exhaust structure 821, which extends along the extending direction of the channel part 8222. Alternatively, the second exhaust structure 821 includes a plurality of sub-channels 8211 spaced apart along the extending direction of the channel part 8222.

[0110] The exhaust structure 822 can be a structure on the second wall 82 used to install the second exhaust structure 821. The annular structure can be an annular structure in the exhaust structure 822. The connecting part 8221 and the channel part 8222 are two interconnected substructures in the exhaust structure 822.

[0111] By extending the channel portion 8222 along the circumferential direction of the annular structure and connecting the connecting portion 8221 between the two ends of the channel portion 8222 in the extending direction, the connecting portion 8221 connects the two ends of the channel portion 8222 in the circumferential direction of the annular structure.

[0112] The channel portion 8222 is provided with a second exhaust structure 821, which extends along the extension direction of the channel portion 8222. Specifically, the second exhaust structure 821 in the channel portion 8222 extends continuously along the extension direction of the channel portion 8222, extending circumferentially along the annular structure. This makes the channel portion 8222 in the annular structure a second exhaust structure without structural material. Only a portion of the annular structure in the exhaust structure 822 contains structural material. This causes the discharge material emitted from the battery cell 7 to be impacted when discharged from the second exhaust structure 821, causing the connecting portion 8221 to fold and the exhaust structure 822 to open and release pressure. After the pressure decreases, the exhaust structure 822 rebounds due to the elasticity of the connecting portion 8221, forming a one-way valve effect that reduces the entry of external moisture or dust into the space enclosed by the heat insulation cover 8.

[0113] The second exhaust structure 821 includes a plurality of sub-channels 8211 spaced apart along the extending direction of the channel portion 8222. Specifically, the second exhaust structure 821 in the channel portion 8222 includes a plurality of sub-channels 8211, which are spaced apart along the extending direction of the channel portion 8222. This arrangement of the sub-channels 8211 circumferentially spaced along the annular structure allows some structural material in the channel portion 8222 of the annular structure to be removed to form the second exhaust structure 821. This allows debris mixed in the released material to be intercepted and settled due to impact with the structural material between the sub-channels 8211, while the gas continues to be discharged through the sub-channels 8211.

[0114] In some embodiments, the cross-sectional area of ​​the first exhaust structure 811 is M1 in a plane perpendicular to the second direction Y; and the cross-sectional area of ​​the second exhaust structure 821 is M2 in a plane perpendicular to the third direction Z, where 0.4 ≤ M2 / M1 ≤ 1.

[0115] By setting the relationship between the cross-sectional area M1 of the first exhaust structure 811 on a plane perpendicular to the second direction Y and the cross-sectional area M2 of the second exhaust structure 821 on a plane perpendicular to the third direction Z to M2 / M1≤1, the effective flow cross-sectional area of ​​the second exhaust structure 821 is less than or equal to the effective flow cross-sectional area of ​​the first exhaust structure 811. This allows the discharged material to be discharged mainly from the first exhaust structure 811 to the outside of the heat insulation cover 8, which helps to reduce the resistance encountered by the discharged material when it is discharged outward.

[0116] By setting the relationship between the cross-sectional area M1 of the first exhaust structure 811 on the plane perpendicular to the second direction Y and the cross-sectional area M2 of the second exhaust structure 821 on the plane perpendicular to the third direction Z to M2 / M1≥0.4, the effective flow cross-sectional area of ​​the second exhaust structure 821 is not too small, so that the second exhaust structure 821 has sufficient diversion effect on the discharged substances and can effectively reduce the impact force of the discharged substances in a certain direction.

[0117] The relationship between the cross-sectional area M1 of the first exhaust structure 811 on the plane perpendicular to the second direction Y and the cross-sectional area M2 of the second exhaust structure 821 on the plane perpendicular to the third direction Z is set to 0.5≤M2 / M1≤1. For example, the ratio can be set to 0.5, 0.6, 0.7, 0.8, 0.9 or 1. This not only allows the discharged material to be discharged mainly from the first exhaust structure 811 to the outside of the heat insulation cover 8, reducing the resistance encountered when the discharged material is discharged outward, but also makes it less likely that the effective flow cross-sectional area of ​​the second exhaust structure 821 will be too small, and the second exhaust structure 821 can effectively divert the discharged material.

[0118] In some embodiments, in the third direction Z, the distance between the first exhaust structure 811 and the connection point of the first wall 81 and the second wall 82 is D1, where D1 ≥ 2.5 mm; in the second direction Y, the distance between the second exhaust structure 821 and the connection point of the first wall 81 and the second wall 82 is D2, where D2 ≥ 2.5 mm.

[0119] By setting the distance D1 between the first exhaust structure 811 and the connection point of the first wall 81 and the second wall 82 in the third direction Z to D1≥2.5mm, the distance between the first exhaust structure 811 and the connection point of the first wall 81 and the second wall 82 is not too close, which can reduce the possibility of stress concentration at the first exhaust structure 811 and reduce the possibility of cracks or other damage to the first wall 81 on the outer periphery of the first exhaust structure 811.

[0120] The distance D1 between the first exhaust structure 811 and the junction of the first wall 81 and the second wall 82 in the third direction Z is set to D1≥3mm. For example, D1 can be set to 4mm, 5mm or 6mm.

[0121] By setting the distance D2 between the second exhaust structure 821 and the connection point of the first wall 81 and the second wall 82 in the second direction Y to D2≥2.5mm, the distance between the second exhaust structure 821 and the connection point of the first wall 81 and the second wall 82 is less likely to be too close, which can reduce the possibility of stress concentration at the second exhaust structure 821 and reduce the possibility of cracks or other damage to the second wall 82 on the outer periphery of the second exhaust structure 821.

[0122] The distance D2 between the second exhaust structure 821 and the junction of the first wall 81 and the second wall 82 in the second direction Y is set to D2≥3mm. For example, D2 can be set to 4mm, 5mm or 6mm.

[0123] In some embodiments, at least two first wall bodies 81 are provided, and the at least two first wall bodies 81 are stacked along the second direction Y, and the first exhaust structures 811 on the at least two first wall bodies 81 are staggered along a direction perpendicular to the second direction Y.

[0124] By setting at least two first walls 81 stacked along the second direction Y, and staggering the first exhaust structures 811 on the at least two first walls 81 in a direction perpendicular to the second direction Y, not only can the tear resistance redundancy of the heat insulation cover 8 be improved, but the staggered first exhaust structures 811 can also extend the path length of the released material through the heat insulation component, which is beneficial to slow down the flow rate of the released material.

[0125] In some embodiments, a plurality of second exhaust structures 821 are provided, and the plurality of second exhaust structures 821 are spaced apart along a first direction X; in the first direction X, the size of the second exhaust structure 821 is set to E1, the interval between two adjacent second exhaust structures 821 is set to E2, and E2 / E1≥1.5.

[0126] By providing multiple second exhaust structures 821 spaced apart along the first direction X on the second wall 82, the multiple second exhaust structures 821 can correspond to the multiple battery cells 7 stacked along the first direction X in the battery cell group 70. This allows the venting material flowing between the battery cell group 70 and the second side plate to be discharged to the outside of the heat insulation component through the multiple second exhaust structures 821, making the venting material less likely to be too concentrated and dispersing the venting pressure.

[0127] For example, by providing a plurality of first exhaust structures 811 spaced apart along the first direction X on the first wall 81, the plurality of first exhaust structures 811 can correspond to the plurality of battery cells 7 stacked along the first direction X in the battery cell group 70. This not only allows the discharged substances to be discharged to the outside of the heat insulation component through the first exhaust structures 811 when multiple battery cells 7 in the battery cell group 70 are depressurized, but also allows the discharged substances to be discharged to the outside of the heat insulation component through the plurality of first exhaust structures 811 respectively, so that the discharged substances are not too concentrated and the pressure of discharge can be dispersed.

[0128] By setting the dimension of the second exhaust structure 821 in the first direction X to E1, setting the dimension of the interval between two adjacent second exhaust structures 821 in the first direction X to E2, and setting the relationship between the two to E2 / E1≥1.5, there is a sufficient interval length between two adjacent second exhaust structures 821, so that the second exhaust structure 821 can reduce the structural strength of the second wall 82 less, which is beneficial to improving the structural strength of the heat insulation component.

[0129] The relationship between the dimension E1 of the second exhaust structure 821 in the first direction X and the dimension E2 of the interval between two adjacent second exhaust structures 821 in the first direction X is set to E2 / E1≥2. For example, E2 / E1 can be set to 2, 3, or 4, which is beneficial to give the second wall 82 good structural strength.

[0130] In some embodiments, reference Figure 9 The battery cell group 70 is provided with at least two, and the at least two battery cell groups 70 are arranged at intervals along the third direction Z. Adjacent heat shields 8 form a second exhaust channel 11 at intervals, and the second exhaust structure 821 is connected to the second exhaust channel 11.

[0131] By setting at least two battery cell groups 70 arranged at Z intervals along the third direction in the housing 5, the battery device 2 has a large capacity.

[0132] Each battery cell 70 is covered with a heat shield 8. Two adjacent heat shields 8 form a second exhaust channel 11 at intervals. This means that there is a gap between the adjacent second walls 82 of adjacent heat shields 8, which forms a second exhaust channel 11 extending along the first direction X. The second exhaust structure 821 is connected to the second exhaust channel 11, so that the venting material discharged from the second exhaust structure 821 can be discharged through the second exhaust channel 11 along the first direction X, so as to reach the exhaust valve provided on the housing 5, and thus be discharged outside the housing 5.

[0133] In some embodiments, the first wall 81 and the second wall 82 are integrally formed structures.

[0134] The first wall 81 and the second wall 82 are integrally formed structures, which means that the first wall 81 and the second wall 82 are formed from the same blank through a bending process. This not only makes the heat insulation cover 8 easy to manufacture, but also gives the overall structure of the heat insulation cover 8 good strength.

[0135] Some embodiments of this application also provide an electrical device, which includes a battery device 2 provided by any of the above technical solutions, the battery device 2 being used to provide electrical energy.

[0136] Some embodiments of this application provide a battery device 2, which includes a housing 5, a battery cell assembly 70, a sampling element 9, and a heat shield 8. The battery cell assembly 70 is housed in the housing 5 and includes a plurality of battery cells 7 stacked along a first direction X. The heat shield 8 includes a first wall 81 and a second wall 82 connected to each other. The first wall 81 covers the outer side of the battery cell assembly 70 in a second direction Y, and the second wall 82 covers the outer side of the battery cell assembly 70 in a third direction Z. The third direction Z, the second direction Y, and the first direction X are perpendicular to each other. The first wall 81 is provided with a plurality of first venting structures 811 penetrating the first wall 81 along its thickness direction, and the plurality of first venting structures 811 are spaced apart along the first direction X. The second wall 82 is provided with a second venting structure 821 penetrating the second wall 82 along its thickness direction, and the plurality of second venting structures 821 are spaced apart along the first direction X. When the battery cells 7 are in a depressurized state, the second venting structures 821 and the first venting structures 811 are connected. The casing of the battery cell 7 includes a wall portion 711 near the first wall 81 in the second direction Y. A pressure relief mechanism 72 and electrode terminals 73 are provided on the wall portion 711. A sampling member 9 is disposed between the wall portion 711 and the first wall 81. The electrode terminals 73 pass through the lead-out hole 91 of the sampling member 9 and are electrically connected by a busbar 13. The pressure relief mechanism 72, the clearance hole of the sampling member 9, and the first venting structure 811 are stacked in orthographic projection on a plane perpendicular to the second direction Y. A venting structure 822 is provided on the second wall 82. The venting structure 822 includes a connecting portion 8221 and a channel portion 8222, which are connected to form a ring structure. A second venting structure 821 is provided on the channel portion 8222, extending along the extending direction of the channel portion 8222.

[0137] In the above structure, the first wall 81 of the heat shield 8 covers the outer side of the battery cell group 70 in the second direction Y, and the second wall 82 covers the outer side of the battery cell group 70 in the third direction Z. This can block the outward diffusion of heat from the battery cell group 70, reducing the possibility of heat from the thermally runaway battery cell group 70 spreading to surrounding battery cell groups 70. Since the first wall 81 is provided with a first exhaust structure 811 and the second wall 82 is provided with a second exhaust structure 821, and when the battery cell 7 is in a depressurized state, the second exhaust structure 821 and the first exhaust structure 811 are connected, allowing the discharged substances emitted by the battery cell 7 to be discharged in different directions through the first exhaust structure 811 and the second exhaust structure 821. This achieves the diversion of the discharged substances. Compared with the discharge of all the discharged substances along a specific direction, it can reduce the impact force of the discharged substances, reduce the possibility of damage to other components in the battery device 2, and help improve the reliability of the battery device 2.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Box; A battery cell assembly is housed in the housing, the battery cell assembly comprising a plurality of battery cells stacked along a first direction; A heat insulation cover is disposed within the housing. The heat insulation cover includes a first wall and a second wall connected to each other. The first wall covers the outer side of the battery cell assembly in a second direction, and the second wall covers the outer side of the battery cell assembly in a third direction. The third direction, the second direction, and the first direction intersect each other but are not coplanar. The first wall is provided with a first venting structure, and the second wall is provided with a second venting structure. An venting gap is provided between the heat insulation cover and the battery cell assembly, and the venting gap communicates with the first venting structure and the second venting structure.

2. The battery device according to claim 1, characterized in that, The first exhaust structure includes a first channel penetrating the first wall along the thickness direction of the first wall, and the second exhaust structure includes a second channel penetrating the second wall along the thickness direction of the second wall.

3. The battery device according to claim 1, characterized in that, The battery cell includes a housing and a pressure relief mechanism. The housing includes a wall portion in the second direction near the first wall, and the pressure relief mechanism is disposed in the wall portion.

4. The battery device according to claim 3, characterized in that, On a plane perpendicular to the second direction, at least a portion of the orthographic projection of the pressure relief mechanism overlaps with the orthographic projection of the first exhaust structure.

5. The battery device according to claim 4, characterized in that, On a plane perpendicular to the second direction, at least a portion of the orthographic projection of the pressure relief mechanism of at least two of the battery cells overlaps with the orthographic projection of the same first exhaust structure.

6. The battery device according to claim 3, characterized in that, The battery cell further includes an electrode terminal protruding from the wall portion, and the battery device further includes a sampling member having an outlet hole and a clearance hole, the sampling member being disposed between the wall portion and the first wall body, and at least a portion of the electrode terminal extending into the outlet hole; on a plane perpendicular to the second direction, at least a portion of the orthographic projection of the pressure relief mechanism overlaps with the orthographic projection of the clearance hole; The sampling element is spaced apart from the first wall to form a first exhaust channel.

7. The battery device according to claim 6, characterized in that, The surface of the sampling element facing the wall is provided with a protective structural layer.

8. The battery device according to claim 3, characterized in that, On a plane perpendicular to the second direction, the cross-sectional area of ​​the first exhaust structure is M1, and the effective opening area of ​​the pressure relief mechanism is set to M3, where 0.4≤M1 / M3≤0.

9.

9. The battery device according to claim 1, characterized in that, The cross-sectional shape of the first exhaust structure in the plane perpendicular to the second direction has a dimension of L in the third direction, and the cross-sectional shape of the first exhaust structure in the plane perpendicular to the second direction has a dimension of W in the first direction, where 3≤L / W≤10.

10. The battery device according to claim 1, characterized in that, The second wall is provided with a discharge structure, which includes an annular structure. The annular structure includes a connecting part and a channel part. The channel part extends circumferentially along the annular structure, and the connecting part connects the two ends of the channel part in the extending direction. The channel portion is provided with a second exhaust structure, which extends along the extension direction of the channel portion, or the second exhaust structure includes a plurality of sub-channels spaced apart along the extension direction of the channel portion.

11. The battery device according to claim 1, characterized in that, On a plane perpendicular to the second direction, the cross-sectional area of ​​the first exhaust structure is M1; on a plane perpendicular to the third direction, the cross-sectional area of ​​the second exhaust structure is M2, and 0.4≤M2 / M1≤1.

12. The battery device according to claim 1, characterized in that, In the third direction, the distance between the first exhaust structure and the connection between the first wall and the second wall is D1, where D1 ≥ 2.5 mm; in the second direction, the distance between the second exhaust structure and the connection between the first wall and the second wall is D2, where D2 ≥ 2.5 mm.

13. The battery device according to claim 1, characterized in that, The first wall body is provided in at least two, and the at least two first wall bodies are stacked along the second direction. The first exhaust structure on the at least two first wall bodies is staggered along a direction perpendicular to the second direction.

14. The battery device according to claim 1, characterized in that, The second exhaust structure is provided in multiple ways, and the multiple second exhaust structures are spaced apart along the first direction; in the first direction, the size of the second exhaust structure is set to E1, the interval between two adjacent second exhaust structures is set to E2, and E2 / E1≥1.

5.

15. The battery device according to claim 1, characterized in that, The battery cell group is provided with at least two, and the at least two battery cell groups are arranged at intervals along the third direction. The two adjacent heat insulation covers are spaced apart to form a second exhaust channel, and the second exhaust structure is connected to the second exhaust channel.

16. The battery device according to claim 1, characterized in that, The first wall and the second wall are integrally formed structures.

17. An electrical device, characterized in that, Includes the battery device as described in any one of claims 1-16, the battery device being used to provide electrical energy.

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