Battery device and electric device

Abstract

The embodiment of the application provides a battery device and a power utilization device, the battery device comprises a box body and a battery cell. The box body has a first box wall. The battery cell is accommodated in the box body, and the battery cell is located on one side of the first box wall along a first direction. Wherein, the first box wall has an accommodation cavity, the first box wall comprises a first wall and a second wall arranged along the first direction, the accommodation cavity is located between the first wall and the second wall, the surface of the first wall facing the accommodation cavity is provided with a first protruding part, the surface of the second wall facing the accommodation cavity is provided with a second protruding part, the first protruding part and the first wall are both not in contact with the second protruding part, and the second wall is not in contact with the first protruding part. Such a battery device takes into account the heat preservation performance and the structural strength, and improves the use performance and reliability of the battery cell.

Description

Technical Field

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

[0002] With the rapid development of new energy technologies, battery devices are increasingly widely used in electric vehicles, energy storage systems, and other fields. In the development of battery devices, besides improving reliability, enhancing performance is also a crucial issue. Therefore, improving battery performance is a continuous technical challenge in battery technology. Utility Model Content

[0003] This application provides a battery device and an electrical device to improve the performance of the battery device.

[0004] In a first aspect, embodiments of this application provide a battery device, including a housing and a battery cell. The housing has a first housing wall. The battery cell is housed within the housing, and is located on one side of the first housing wall along a first direction. The first housing wall has a receiving cavity, comprising a first wall and a second wall arranged along the first direction, the receiving cavity being located between the first wall and the second wall. A first protrusion is provided on the surface of the first wall facing the receiving cavity, and a second protrusion is provided on the surface of the second wall facing the receiving cavity. Neither the first protrusion nor the first wall contacts the second protrusion, and neither the second wall nor the first protrusion contacts the first protrusion.

[0005] In the above technical solution, by ensuring that neither the first protrusion nor the first wall contacts the second protrusion, and the second wall does not contact the first protrusion, the thermal insulation effect between the first and second walls is improved. This is beneficial for the heat preservation of the battery cells and reduces the impact of external ambient temperature on the battery cell temperature. Furthermore, when the first or second wall is deformed by external force, the first and second protrusions can abut against each other, maintaining a certain distance between the first and second walls. This ensures that the first casing wall maintains high structural strength and reduces the risk of damage to the first casing wall. Such a battery device balances heat preservation performance and structural strength, improving the performance and reliability of the battery cells.

[0006] In some embodiments, each first protrusion and a second protrusion are arranged opposite to each other and spaced apart along a first direction. Thus, when the first casing wall is subjected to external pressure, on the one hand, the first and second protrusions can abut against each other, jointly supporting the first and second walls, reducing the risk of direct contact between the first and second walls, thereby improving the structural strength of the battery device; on the other hand, along the first direction, the first and second protrusions can have smaller dimensions, which is beneficial for improving the structural strength of the first and second protrusions and reducing the risk of breakage or excessive deformation of the first and second protrusions under pressure.

[0007] In some embodiments, the first wall includes a plurality of first protrusions, which are spaced apart on the surface of the first wall facing the receiving cavity. The surface of the second wall facing the receiving cavity is provided with a plurality of second protrusions, which correspond one-to-one with the first protrusions. By providing a plurality of first and second protrusions, the risk of direct contact between the first and second walls can be further reduced, thereby improving the structural strength of the battery device.

[0008] In some embodiments, the minimum distance between the first protrusion and the second protrusion is greater than or equal to 0.5 mm. By setting the minimum distance between the first protrusion and the second protrusion to be greater than or equal to 0.5 mm, it is beneficial to improve the thermal insulation effect between the first wall and the second wall, thereby improving the heat preservation performance of the battery device.

[0009] In some embodiments, the battery device further includes a heat insulation member, at least a portion of which is located between the first protrusion and the second protrusion along a first direction. By positioning at least a portion of the heat insulation member between the first and second protrusions, on the one hand, the heat insulation member can improve the thermal insulation effect between the first and second protrusions, further reducing the risk of heat transfer between the first and second walls; on the other hand, when the first or second wall is deformed by external force, the heat insulation member can remain between the first and second protrusions, thereby reducing the risk of thermal connection between the first and second protrusions and further improving the thermal insulation performance of the battery device.

[0010] In some embodiments, the heat insulation member is connected to the first protrusion. By connecting the heat insulation member to the first protrusion, the positional stability of the heat insulation member can be improved, reducing the risk of the heat insulation member shifting or falling off during use.

[0011] In some embodiments, the first protrusion engages with the thermal insulation component along a first direction. By engaging the first protrusion with the thermal insulation component, the installation difficulty of the thermal insulation component is reduced, and maintenance costs are lowered.

[0012] In some embodiments, the first protrusion is bonded to the thermal insulation member along a first direction. By bonding the first protrusion to the thermal insulation member, the connection strength between the thermal insulation member and the first protrusion can be improved, further reducing the risk of the thermal insulation member shifting or falling off during use.

[0013] In some embodiments, the first protrusion includes a first protruding body and a plurality of first protrusions. Along a first direction, the first protruding body is disposed on the surface of the first wall facing the receiving cavity, and the plurality of first protrusions are disposed at intervals on one end of the first protruding body facing the heat insulation member, and the plurality of first protrusions are connected to the heat insulation member. By distributing the plurality of first protrusions at intervals on one end of the first protruding body facing the heat insulation member, when the first wall is pressed along the first direction, the plurality of first protrusions abut against the heat insulation member, which helps to reduce the contact area between the first protrusion and the heat insulation member, thereby further reducing the heat conduction efficiency of the first wall and the second wall.

[0014] In some embodiments, the second protrusion includes a second protruding body and a plurality of second protrusions. Along a first direction, the second protruding body is disposed on the surface of the second wall facing the receiving cavity, and the plurality of second protrusions are disposed at intervals at one end of the second protruding body facing the heat insulation member, and are connected to the heat insulation member. By providing a plurality of second protrusions at intervals at one end of the second protruding body facing the heat insulation member, when the first wall is pressed along the first direction, both ends of the heat insulation member along the first direction abut against the first and second protrusions respectively. This helps to reduce the contact area between the first and second protrusions and the heat insulation member, thereby further reducing the heat conduction efficiency of the first and second walls.

[0015] In some embodiments, along the first direction, the end face area of ​​the first protrusion connected to one end of the first protruding body is larger than the end face area of ​​the first protrusion connected to the heat insulation member. This allows for a smaller contact area between the first protrusion and the heat insulation member, which helps improve the thermal insulation effect between the first wall and the second wall.

[0016] In some embodiments, along the first direction, the end face area of ​​the second protrusion connected to one end of the second protruding body is larger than the end face area of ​​the second protrusion connected to the heat insulation member. This allows for a smaller contact area between the second protrusion and the heat insulation member, which helps improve the thermal insulation effect between the first wall and the second wall.

[0017] In some embodiments, the first wall includes a plurality of first protrusions, which are spaced apart on the surface of the first wall facing the receiving cavity. Along a first direction, a heat insulation member is located between the plurality of first protrusions and second protrusions. By positioning the heat insulation member between the plurality of first protrusions and second protrusions, the heat insulation member can isolate a larger area between the first wall and the second wall, improving the thermal insulation effect between the first wall and the second wall.

[0018] In some embodiments, the battery device includes a plurality of heat insulation members, each corresponding to a first protrusion. By providing a plurality of heat insulation members corresponding to a plurality of first protrusions, the cost of using the heat insulation members can be reduced.

[0019] In some embodiments, the thermal conductivity of the insulation element is less than that of the first box wall.

[0020] In some embodiments, the thermal conductivity of the insulation component is 0.003 W / (m·K) to 0.2 W / (m·K). A thermal conductivity greater than or equal to 0.003 W / (m·K) helps reduce the cost of the insulation component; a thermal conductivity less than or equal to 0.2 W / (m·K) results in a stronger insulation effect, improving the thermal insulation performance of the first and second walls. Therefore, a thermal conductivity of 0.003 W / (m·K) to 0.2 W / (m·K) balances cost reduction with improved thermal insulation performance of the first and second walls.

[0021] In some embodiments, the insulation material is aerogel, ceramic fiber, or glass wool. This allows the insulation to achieve both strong thermal insulation performance and low cost.

[0022] In some embodiments, the battery device further includes an elastic member, which is arranged and connected to a heat insulation member along a first direction. Along the first direction, one of the heat insulation member and the elastic member is connected to a first protrusion, and the other is used to abut against a second wall. By configuring one of the elastic member and the heat insulation member to be connected to the first protrusion and the other to abut against the second wall, the arrangement of the elastic member and the heat insulation member can simultaneously improve the heat insulation effect between the first protrusion and the second wall and improve the buffering capacity between the first wall and the second wall, thereby reducing the risk of stress concentration caused by vibration or thermal expansion during the use of the battery device.

[0023] In some embodiments, the first protrusion and the second protrusion are spaced apart along a second direction, which is perpendicular to the first direction. This misalignment of the first and second protrusions along the second direction reduces the risk of contact between them and improves the thermal insulation performance of the first and second walls.

[0024] In some embodiments, in a projection plane perpendicular to the second direction, a portion of the orthographic projection of the first protrusion and a portion of the orthographic projection of the second protrusion overlap. Thus, the first and second protrusions have a relatively long dimension between the first and second walls, which is beneficial for improving the deformation resistance of the first box wall.

[0025] In some embodiments, the minimum distance between the first protrusion and the second wall is greater than or equal to 0.5 mm, and the minimum distance between the second protrusion and the first wall is greater than or equal to 0.5 mm. Having the minimum distance between the first protrusion and the second wall greater than or equal to 0.5 mm, and the minimum distance between the second protrusion and the first wall greater than or equal to 0.5 mm, helps to improve the thermal insulation effect between the first wall and the second wall, thereby improving the heat preservation performance of the battery device.

[0026] In some embodiments, the first protrusion extends from the first wall toward the direction close to the second wall, and the extension direction of the first protrusion forms an acute angle with the first direction. By setting the extension direction of the first protrusion to an acute angle with the first direction, when the first protrusion is compressed, the first protrusion can undergo a certain elastic deformation along its extension direction, thereby absorbing part of the impact energy, reducing the risk of rigid collision between the first wall and the second wall, and further improving the structural stability and impact resistance of the battery device.

[0027] In some embodiments, the second protrusion extends from the second wall toward the first wall, and the extension direction of the second protrusion forms an acute angle with the first direction. By setting the extension direction of the second protrusion at an acute angle with the first direction, when the second protrusion is compressed, it can undergo a certain elastic deformation along its extension direction, thereby absorbing part of the impact energy, reducing the risk of rigid collision between the first and second walls, and further improving the structural stability and impact resistance of the battery device.

[0028] In some embodiments, the air pressure inside the containment cavity is lower than standard atmospheric pressure. This makes the air inside the containment cavity more rarefied, which helps to improve the thermal insulation effect of the first and second walls.

[0029] In some embodiments, the cavity is a vacuum. This further enhances the thermal insulation effect of the first and second walls.

[0030] In some embodiments, along a first direction, the battery cell has a first surface facing the first housing wall, and the first surface is the surface with the largest area among the plurality of outer surfaces of the battery cell. Thus, when the battery cell expands, it is easier for the battery cell to compress the first housing wall. By providing a first protrusion on the surface of the first wall facing the receiving cavity and a second protrusion on the surface of the second wall facing the receiving cavity, the risk of contact between the first and second walls can be further reduced, and the structural strength of the first housing wall can be improved.

[0031] Secondly, embodiments of this application provide an electrical device, including the battery device provided in any one of the embodiments of the first aspect. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments; Figure 2 Exploded views of battery devices provided in some embodiments of this application; Figure 3 Exploded views of a single battery cell provided in some embodiments of this application; Figure 4 This is a partial structural schematic diagram of a battery device provided in some embodiments of this application; Figure 5 for Figure 4 A magnified view of a portion of region A in the middle; Figure 6 An assembly diagram of the first box wall and the heat insulation component provided for some embodiments of this application; Figure 7 A partial structural schematic diagram of the first box wall and heat insulation element provided for some embodiments of this application; Figure 8 An assembly diagram of the first box wall and the heat insulation component provided for some embodiments of this application; Figure 9 An assembly diagram of the first box wall, elastic element, and heat insulation element provided for some embodiments of this application; Figure 10 This application provides a schematic diagram of the structure of the first box wall for some embodiments; Figure 11 for Figure 10 A magnified view of a portion of region B in the middle; Figure 12 This is a structural schematic diagram of the first box wall provided for some embodiments of this application.

[0034] Icons: 1-Box body; 11-First box body; 12-Second box body; 13-First box wall; 13a-Receiving cavity; 131-First wall; 132-Second wall; 133-First protrusion; 1331-First protruding body; 1332-First protrusion; 134-Second protrusion; 1341-Second protruding body; 1342-Second protrusion; 2-Battery cell; 21-Casing; 211-Housing shell; 212-End cap; 22-Electrode assembly; 23-Electrode terminal; 3-Insulation component; 4-Elastic component; 10 - Battery device; 20 - Controller; 30 - Motor; 100 - Vehicle; X - First direction; Z - Second direction. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0037] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0040] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0041] In this application, "multiple" means two or more (including two).

[0042] In this embodiment of the application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0043] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0044] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0045] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0046] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0047] The battery device 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 are connected in series, parallel, or mixed connections via a busbar.

[0048] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging multiple battery cells and fixing them together to form an independent module.

[0049] As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0050] In some embodiments, the battery device may be a battery pack, which may include a housing and one or more individual battery cell assemblies housed within the housing.

[0051] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0052] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0053] 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 individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0054] 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 individual battery cells.

[0055] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0056] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0057] In battery packs, the temperature of individual battery cells is easily affected by the ambient temperature. When the ambient temperature is too high, the high temperature can easily be conducted to the individual cells through the battery pack casing. When the ambient temperature is too low, the temperature of the individual cells can easily be lost to the outside through the casing. Therefore, both high and low external temperatures can easily lead to temperature imbalances in the individual cells, affecting the reliability of the battery pack. The casing walls, as the main supporting structure of the battery pack, are affected by the structural strength of the casing walls. Therefore, a trade-off exists between the structural strength and thermal insulation performance of the casing walls.

[0058] In view of this, this application provides a battery device, including a housing and a battery cell. The housing has a first housing wall. The battery cell is housed in the housing, and the battery cell is located on one side of the first housing wall along a first direction. The first housing wall has a receiving cavity, and the first housing wall includes a first wall and a second wall arranged along the first direction. The receiving cavity is located between the first wall and the second wall. A first protrusion is provided on the surface of the first wall facing the receiving cavity, and a second protrusion is provided on the surface of the second wall facing the receiving cavity. The first protrusion and the first wall do not contact the second protrusion, and the second wall does not contact the first protrusion.

[0059] In this battery device, by ensuring that neither the first protrusion nor the first wall contacts the second protrusion, and vice versa, the thermal insulation between the first and second walls is improved. This enhances the insulation of the battery cells and reduces the impact of external ambient temperature on their temperature. Furthermore, when either the first or second wall is deformed by external force, the first and second protrusions abut against each other, maintaining a certain distance between them. This ensures the first casing wall retains high structural strength and reduces the risk of damage. This battery device balances insulation performance and structural strength, improving the performance and reliability of the battery cells.

[0060] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0061] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0062] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 100 provided in some embodiments of this application. A battery device 10 is disposed inside the vehicle 100, and the battery device 10 may be located at the bottom, front, or rear of the vehicle 100. The battery device 10 can be used to power the vehicle 100; for example, the battery device 10 can serve as the operating power source for the vehicle 100.

[0063] The vehicle 100 may also include a controller 20 and a motor 30. The controller 20 is used to control the battery device 10 to supply power to the motor 30, for example, for the power needs of the vehicle 100 during startup, navigation and driving.

[0064] In some embodiments of this application, the battery device 10 can not only serve as the operating power source of the vehicle 100, but also as the driving power source of the vehicle 100, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100.

[0065] Please refer to Figure 2 , Figure 2 The following is an exploded view of a battery device 10 provided in some embodiments of this application. The battery device 10 may include a housing 1 and a battery cell 2, wherein the housing 1 is used to house the battery cell 2.

[0066] The housing 1 has an enclosed space inside for accommodating the battery cells 2. The housing 1 can have various structures. In some embodiments, the housing 1 may include a first housing 11 and a second housing 12, which are interlocked. The first housing 11 and the second housing 12 can have various shapes, such as cuboids or cylinders. The first housing 11 can be a hollow structure open on one side, and the second housing 12 can also be a hollow structure open on one side. The open side of the second housing 12 interlocks with the open side of the first housing 11, thus forming a housing 1 with an enclosed space. Alternatively, the first housing 11 can be a hollow structure open on one side, and the second housing 12 can be a plate-like structure, with the second housing 12 interlocked with the open side of the first housing 11, thus forming a housing 1 with an accommodating space.

[0067] In the battery device 10, there can be one or more battery cells 2. If there are multiple battery cells 2, they can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 2 are connected in both series and parallel. Alternatively, multiple battery cells 2 can first be connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed manner to form a whole, which is then housed in the housing 1. Another option is that all battery cells 2 can be directly connected in series, parallel, or in a mixed manner, and then the whole consisting of all battery cells 2 is housed in the housing 1.

[0068] In some embodiments, the battery device 10 may further include a busbar (not shown in the figure), through which multiple battery cells 2 can be electrically connected to each other to achieve series, parallel, or mixed connection of multiple battery cells 2. The busbar can be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0069] Please refer to Figure 3 , Figure 3 This is an exploded view of a battery cell 2 provided in some embodiments of this application. The battery cell 2 may include a housing 21 and an electrode assembly 22, the electrode assembly 22 being housed within the housing 21.

[0070] In some embodiments, the housing 21 may include a housing 211 and an end cap 212, the housing 211 having an opening and the end cap 212 closing the opening of the housing 211. Here, "closing" refers to covering or shutting down, and can be either sealed or unsealed.

[0071] The housing 211 is a component used to house the electrode assembly 22. The housing 211 can be a hollow structure with an opening at one end, or it can be a hollow structure with openings at both opposite ends. The housing 211 can have various shapes, such as cylindrical or cuboid. The housing 211 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The electrode assembly 22 can be partially or completely housed within the housing 211.

[0072] End cap 212 and housing 211 together define a receiving space for accommodating electrode assembly 22 and other components. End cap 212 can be connected to housing 211 by welding, rolling, or other methods to close the opening of housing 211. The shape of end cap 212 can be adapted to the shape of housing 211. For example, if housing 211 is a cuboid structure, end cap 212 can be a rectangular plate structure adapted to housing 211; or if housing 211 is a cylindrical structure, end cap 212 can be a circular plate structure adapted to housing 211. The material of end cap 212 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The materials of end cap 212 and housing 211 can be the same or different.

[0073] In an embodiment where the housing 211 has an opening at one end, one end cap 212 may be provided. In an embodiment where the housing 211 has openings at opposite ends, two end caps 212 may be provided, with the two end caps 212 respectively closing the two openings of the housing 211, and the two end caps 212 and the housing 211 together defining the receiving space.

[0074] In some embodiments, the battery cell 2 may further include an electrode terminal 23 disposed on the housing 21. The electrode terminal 23 is used for electrical connection with the tab of the electrode assembly 22 to input or output electrical energy of the battery cell 2. The electrode terminal 23 may be disposed on the housing 211 of the housing 21 or on the end cap 212 of the housing 21. The electrode terminal 23 and the tab may be directly connected, for example, by welding the electrode terminal 23 to the tab. The electrode terminal 23 and the tab may also be indirectly connected, for example, by connecting the electrode terminal 23 to the tab indirectly through a current collector. The current collector may be a metallic conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0075] As an example, such as Figure 3 The housing 211 has an opening at one end, and there is one end cap 212 in the housing 21, which closes one opening of the housing 211. The end cap 212 is provided with two electrode terminals 23, which are a positive electrode terminal 23 and a negative electrode terminal 23, respectively. The end of the electrode assembly 22 facing the end cap 212 has a positive electrode tab and a negative electrode tab. The positive electrode terminal 23 is electrically connected to the positive electrode tab, and the negative electrode terminal 23 is electrically connected to the negative electrode tab.

[0076] Please refer to Figure 4 , Figure 4 This is a partial structural schematic diagram of a battery device 10 provided in some embodiments of this application. Embodiments of this application provide a battery device 10, including a housing 1 and a battery cell 2. The housing 1 has a first housing wall 13. The battery cell 2 is housed within the housing 1, and the battery cell 2 is located on one side of the first housing wall 13 along a first direction X. The first housing wall 13 has a receiving cavity 13a, and includes a first wall 131 and a second wall 132 arranged along the first direction X. The receiving cavity 13a is located between the first wall 131 and the second wall 132. A first protrusion 133 is provided on the surface of the first wall 131 facing the receiving cavity 13a, and a second protrusion 134 is provided on the surface of the second wall 132 facing the receiving cavity 13a. The first protrusion 133 and the first wall 131 do not contact the second protrusion 134, and the second wall 132 does not contact the first protrusion 133.

[0077] The first box wall 13 can be the outer wall of the box body 1; for example, the first box wall 13 can be the side wall of the box body 1; or the first box wall 13 can be the bottom wall of the box body 1. Alternatively, the first box wall 13 can be the inner wall of the box body 1; for example, the first box wall 13 can be the expansion beam inside the box body 1. The box body 1 includes a first compartment for accommodating the battery cell 2 and a second compartment for accommodating the control module. The expansion beam separates the first compartment and the second compartment. The control module is used to electrically control the battery cell 2.

[0078] The number of battery cells 2 can be one or more. In an embodiment where there are multiple battery cells 2, the multiple battery cells 2 are located on the same side of the first housing wall 13 along the first direction X.

[0079] The receiving cavity 13a is an internal cavity structure of the first housing wall 13, making the first housing wall 13 hollow. The first wall 131 and the second wall 132 are arranged along the first direction X, and the first wall 131 may be closer to the battery cell 2 than the second wall 132; or the second wall 132 may be closer to the battery cell 2 than the first wall 131. The first wall 131 has two opposing surfaces, and a first protrusion 133 protrudes from the surface of the first wall 131 facing the second wall 132. The receiving cavity 13a is located between the first wall 131 and the second wall 132, such that the first wall 131 and the second wall 132 are spaced apart.

[0080] The first wall 131 and the first protrusion 133 can be integrally formed; for example, the first wall 131 and the first protrusion 133 can be integrally cast. Alternatively, the first wall 131 and the first protrusion 133 can be separately provided and connected; for example, the first wall 131 and the first protrusion 133 can be welded.

[0081] The first protrusion 133 and the second wall 132 do not contact each other, and the first wall 131 and the second wall 132 are spaced apart along the first direction X, so that the first wall 131 and the second wall 132 do not contact each other. The first wall 131 and the second wall 132 do not contact each other, so as to reduce the contact heat conduction between the first protrusion 133 and the second wall 132, which helps to thermally isolate the first wall 131 and the second wall 132.

[0082] The second protrusion 134 is disposed on the surface of the second wall 132 facing the receiving cavity 13a, such that the second protrusion 134 is closer to the first wall 131 than the second wall 132. The first protrusion 133 is disposed on the surface of the first wall 131 facing the receiving cavity 13a, such that the first protrusion 133 is closer to the second wall 132 than the first wall 131.

[0083] The second protrusion 134 does not contact the first wall 131, thereby reducing the heat conduction between the second protrusion 134 and the first wall 131 and contributing to the thermal isolation between the first wall 131 and the second wall 132.

[0084] In this embodiment, by ensuring that the first protrusion 133 and the first wall 131 do not contact the second protrusion 134, and that the second wall 132 does not contact the first protrusion 133, the thermal insulation effect between the first wall 131 and the second wall 132 is improved. This is beneficial for the heat preservation of the battery cell 2 and reduces the influence of the external ambient temperature on the temperature of the battery cell 2. Furthermore, when the first wall 131 or the second wall 132 is deformed by external force, the first protrusion 133 and the second protrusion 134 can abut against the first wall 131 and the second wall 132, maintaining a certain distance between them. This ensures that the first casing wall 13 maintains high structural strength and reduces the risk of damage to the first casing wall 13. Such a battery device 10 balances heat preservation performance and structural strength, improving the performance and reliability of the battery cell 2.

[0085] In some embodiments, please continue to refer to Figure 4 Along the first direction X, each first protrusion 133 and a second protrusion 134 are arranged opposite to each other and spaced apart.

[0086] The number of first protrusions 133 can be one or more. In embodiments where there are multiple first protrusions 133, the first protrusions 133 and the second protrusions 134 may correspond one-to-one; or multiple first protrusions 133 and the same second protrusion 134 may be arranged opposite to each other along the first direction X and spaced apart.

[0087] In this embodiment, when the first box wall 13 is squeezed by an external force, on the one hand, the first protrusion 133 and the second protrusion 134 can abut against each other and jointly support the first wall 131 and the second wall 132, reducing the risk of direct contact between the first wall 131 and the second wall 132, thereby improving the structural strength of the battery device 10; on the other hand, along the first direction X, the first protrusion 133 and the second protrusion 134 can have a smaller size, which is beneficial to improving the structural strength of the first protrusion 133 and the second protrusion 134 and reducing the risk of the first protrusion 133 and the second protrusion 134 breaking or excessively deforming under pressure.

[0088] In some embodiments, please continue to refer to Figure 6 The first wall 131 is provided with a plurality of first protrusions 133, which are spaced apart on the surface of the first wall 131 facing the receiving cavity 13a. The second wall 132 is provided with a plurality of second protrusions 134 on the surface facing the receiving cavity 13a, and the second protrusions 134 correspond one-to-one with the first protrusions 133.

[0089] Any two first protrusions 133 are spaced apart. On the second wall 132, each first protrusion 133 is correspondingly provided with a second protrusion 134, so that the first protrusions 133 and the second protrusions 134 correspond one-to-one and are spaced apart.

[0090] In this embodiment, by providing multiple first protrusions 133 and second protrusions 134, the risk of direct contact between the first wall 131 and the second wall 132 can be further reduced, thereby improving the structural strength of the battery device 10.

[0091] In some embodiments, please refer to Figure 5 , Figure 5 for Figure 4 A magnified view of a portion of region A. The minimum distance between the first protrusion 133 and the second protrusion 134 is greater than or equal to 0.5 mm.

[0092] The minimum distance between the first protrusion 133 and the second protrusion 134 is L1, which can be 0.5mm, 1mm, 2mm, 3mm, 5mm, 10mm, 20mm, 30mm, 40mm, etc.

[0093] In this embodiment, by setting the minimum distance between the first protrusion 133 and the second protrusion 134 to be greater than or equal to 0.5 mm, it is beneficial to improve the thermal insulation effect between the first wall 131 and the second wall 132 and improve the heat preservation performance of the battery device 10.

[0094] In some embodiments, please refer to Figure 6 , Figure 6This is a schematic diagram of the assembly of the first casing wall 13 and the heat insulation member 3 provided for some embodiments of this application. The battery device 10 also includes the heat insulation member 3, at least a portion of which is located between the first protrusion 133 and the second protrusion 134 along the first direction X.

[0095] The heat insulation element 3 may be entirely located between the first protrusion 133 and the second protrusion 134; or only a portion of the heat insulation element 3 may be located between the first protrusion 133 and the second protrusion 134. The heat insulation element 3 may be connected to the first protrusion 133; or the heat insulation element 3 may be connected to the second protrusion 134; or the first protrusion 133 and the second protrusion 134 may jointly clamp the heat insulation element 3.

[0096] The thermal insulation component 3 can be made of materials with low thermal conductivity, such as thermal insulation cotton, aerogel felt, foam plastic, or fiberglass board. The thermal insulation component 3 is used to thermally insulate the first protrusion 133 and the second protrusion 134.

[0097] In this embodiment, by setting at least a portion of the heat insulation member 3 between the first protrusion 133 and the second protrusion 134, on the one hand, the heat insulation member 3 can improve the thermal isolation effect of the first protrusion 133 and the second protrusion 134, further reducing the risk of heat transfer between the first wall 131 and the second wall 132; on the other hand, when the first wall 131 or the second wall 132 is deformed by external force, the heat insulation member 3 can remain between the first protrusion 133 and the second wall 132, thereby reducing the risk of thermal connection between the first protrusion 133 and the second protrusion 134, and further improving the heat preservation performance of the battery device 10.

[0098] In some embodiments, the heat insulation member 3 is connected to the first protrusion 133.

[0099] The heat insulation component 3 can be snapped, glued, or connected to the first protrusion 133 by fasteners, which can be pins.

[0100] In this embodiment, by connecting the heat insulation component 3 to the first protrusion 133, the positional stability of the heat insulation component 3 can be improved, and the risk of the heat insulation component 3 shifting or falling off during use can be reduced.

[0101] In some embodiments, along the first direction X, the first protrusion 133 is engaged with the heat insulation member 3.

[0102] The first protrusion 133 may be provided with a slot, and the heat insulation component 3 may be provided with a buckle, with the buckle engaging with the slot; or the first protrusion 133 may be provided with a buckle, and the heat insulation component 3 may be provided with a slot, with the buckle engaging with the slot.

[0103] In this embodiment, by setting the first protrusion 133 to snap into the heat insulation component 3, the installation difficulty of the heat insulation component 3 is reduced and the maintenance cost is reduced.

[0104] In some embodiments, the first protrusion 133 is bonded to the heat insulation member 3 along the first direction X.

[0105] An adhesive layer is provided between the first protrusion 133 and the heat insulation member 3, and the first protrusion 133 and the heat insulation member 3 are bonded together by the adhesive layer.

[0106] In this embodiment, by setting the first protrusion 133 to be bonded to the heat insulation component 3, the connection strength between the heat insulation component 3 and the first protrusion 133 can be improved, further reducing the risk of the heat insulation component 3 shifting or falling off during use.

[0107] In some embodiments, please refer to Figure 7 , Figure 7 This is a partial structural diagram of the first box wall 13 and the heat insulation member 3 provided in some embodiments of this application. The first protrusion 133 includes a first protruding body 1331 and a plurality of first protrusions 1332. Along the first direction X, the first protruding body 1331 is disposed on the surface of the first wall 131 facing the receiving cavity 13a, and the plurality of first protrusions 1332 are disposed at intervals at one end of the first protruding body 1331 facing the heat insulation member 3, and the plurality of first protrusions 1332 are connected to the heat insulation member 3.

[0108] One end of the first protruding body 1331 is connected to the first wall 131, and the other end is connected to a plurality of first protrusions 1332. The first protruding body 1331 and the first protrusions 1332 can be separately configured and connected; for example, the first protruding body 1331 and the first protrusions 1332 can be welded together. Alternatively, the first protruding body 1331 and the first protrusions 1332 can be integrally formed; for example, the first protruding body 1331 and the first protrusions 1332 can be integrally stamped.

[0109] The heat insulation component 3 may abut against multiple first protrusions 1332; or the heat insulation component 3 may be bonded to multiple first protrusions 1332.

[0110] In this embodiment, by providing a plurality of first protrusions 1332 at intervals on one end of the first protruding body 1331 facing the heat insulation member 3, when the first box wall 13 is pressed along the first direction X, the plurality of first protrusions 1332 abut against the heat insulation member 3, which helps to reduce the contact area between the first protrusion 133 and the heat insulation member 3, thereby further reducing the heat conduction efficiency of the first wall 131 and the second wall 132.

[0111] In some embodiments, the second protrusion 134 includes a second protruding body 1341 and a plurality of second protrusions 1342. Along the first direction X, the second protruding body 1341 is disposed on the surface of the second wall 132 facing the receiving cavity 13a, and the plurality of second protrusions 1342 are disposed at one end of the second protruding body 1341 facing the heat insulation member 3 and are spaced apart. The plurality of second protrusions 1342 are connected to the heat insulation member 3.

[0112] One end of the second protruding body 1341 is connected to the second wall 132, and the other end is connected to a plurality of second protrusions 1342. The second protruding body 1341 and the second protrusions 1342 can be separately configured and connected; for example, the second protruding body 1341 and the second protrusions 1342 can be welded together. Alternatively, the second protruding body 1341 and the second protrusions 1342 can be integrally formed; for example, the second protruding body 1341 and the second protrusions 1342 can be integrally stamped.

[0113] The heat insulation component 3 may abut against multiple second protrusions 1342; or the heat insulation component 3 may be bonded to multiple second protrusions 1342.

[0114] In this embodiment, by providing a plurality of second protrusions 1342 at intervals on one end of the second protruding body 1341 facing the heat insulation member 3, when the first box wall 13 is pressed along the first direction X, the two ends of the heat insulation member 3 along the first direction X respectively abut against the first protrusion 1332 and the second protrusion 1342, which helps to reduce the contact area between the first protrusion 133 and the second protrusion 134 and the heat insulation member 3, thereby further reducing the heat conduction efficiency of the first wall 131 and the second wall 132.

[0115] In some embodiments, please continue to refer to Figure 7 Along the first direction X, the end face area of ​​the first protrusion 1332 connected to one end of the first protruding body 1331 is greater than the end face area of ​​the first protrusion 1332 connected to one end of the heat insulation member 3.

[0116] For example, the first protrusion 1332 is a conical structure, and the cross-sectional area of ​​the first protrusion 1332 along the first direction X gradually decreases along the end of the first protruding body 1331 pointing towards the heat insulation member 3, so that the end face area of ​​the first protrusion 1332 connected to the end of the first protruding body 1331 is greater than the end face area of ​​the first protrusion 1332 connected to the end of the heat insulation member 3.

[0117] In this embodiment, the first protrusion 133 and the heat insulation member 3 can have a small contact area, which helps to improve the thermal insulation effect between the first wall 131 and the second wall 132.

[0118] In some embodiments, please continue to refer to Figure 7Along the first direction X, the end face area of ​​the second protrusion 1342 connected to one end of the second protruding body 1341 is greater than the end face area of ​​the second protrusion 1342 connected to one end of the heat insulation member 3.

[0119] For example, the second protrusion 1342 is a conical structure, and the cross-sectional area of ​​the second protrusion 1342 along the first direction X gradually decreases along the end of the second protruding body 1341 pointing towards the heat insulation member 3, so that the end face area of ​​the second protrusion 1342 connected to the end of the second protruding body 1341 is greater than the end face area of ​​the second protrusion 1342 connected to the end of the heat insulation member 3.

[0120] In this embodiment, the second protrusion 134 and the heat insulation member 3 can have a small contact area, which helps to improve the thermal insulation effect between the first wall 131 and the second wall 132.

[0121] In some embodiments, please refer to Figure 8 , Figure 8 This is an assembly diagram of the first wall 13 and the heat insulation member 3 provided in some embodiments of this application. The first wall 131 is provided with a plurality of first protrusions 133, which are spaced apart on the surface of the first wall 131 facing the receiving cavity 13a. The heat insulation member 3 is located between the plurality of first protrusions 133 and second protrusions 134 along the first direction X.

[0122] A heat insulation element 3 is shared between multiple first protrusions 133 and second protrusions 134. It is possible that a heat insulation element 3 is located between only a portion of the first protrusions 133 and second protrusions 134; or it is possible that the heat insulation element 3 is located between all the first protrusions 133 and second protrusions 134.

[0123] The number of second protrusions 134 can be one or more. In an embodiment where there is one second protrusion 134, the heat insulation member 3 is located between a plurality of first protrusions 133 and a second protrusion 134. In an embodiment where there are a plurality of second protrusions 134, the heat insulation member 3 is located between a plurality of first protrusions 133 and a plurality of second protrusions 134.

[0124] In this embodiment, by setting the heat insulation member 3 between a plurality of first protrusions 133 and second protrusions 134, the heat insulation member 3 can isolate more areas between the first wall 131 and the second wall 132, thereby improving the thermal insulation effect of the first wall 131 and the second wall 132.

[0125] In some embodiments, please continue to refer to Figure 6 The battery device 10 includes multiple heat insulation elements 3, each corresponding to a first protrusion 133.

[0126] Each heat insulation element 3 is correspondingly disposed between a first protrusion 133 and a second protrusion 134. For example, as shown... Figure 6 As shown, the second protrusion 134 is disposed opposite to the first protrusion 133 and corresponds to it one by one. Each heat insulation element 3 is located between a first protrusion 133 and a second protrusion 134.

[0127] In this embodiment, by setting multiple heat insulation components 3 corresponding one-to-one with multiple first protrusions 133, the cost of using the heat insulation components 3 can be reduced.

[0128] In some embodiments, the thermal conductivity of the insulation element 3 is less than that of the first box wall 13.

[0129] In some embodiments, the thermal conductivity of the insulation element 3 is 0.003 W / (m·K)-0.2 W / (m·K).

[0130] The thermal conductivity of the insulation component 3 can be any one of the following values ​​or a range between any two: 0.003 W / (m·K), 0.005 W / (m·K), 0.01 W / (m·K), 0.02 W / (m·K), 0.03 W / (m·K), 0.04 W / (m·K), 0.05 W / (m·K), 0.06 W / (m·K), 0.08 W / (m·K), 0.1 W / (m·K), 0.12 W / (m·K), 0.15 W / (m·K), 0.18 W / (m·K), and 0.2 W / (m·K).

[0131] In this embodiment, the thermal conductivity of the heat insulation component 3 is greater than or equal to 0.003 W / (m·K), which helps to reduce the cost of the heat insulation component 3; the thermal conductivity of the heat insulation component 3 is less than or equal to 0.2 W / (m·K), which makes the heat insulation component 3 have a strong heat insulation effect and improves the thermal insulation effect of the first wall 131 and the second wall 132; therefore, the thermal conductivity of the heat insulation component 3 is 0.003 W / (m·K)-0.2 W / (m·K), which can balance reducing the cost of the heat insulation component 3 and improving the thermal insulation effect of the first wall 131 and the second wall 132.

[0132] In some embodiments, the insulation element 3 is made of aerogel, ceramic fiber, or glass wool.

[0133] In this embodiment, the heat insulation component 3 can achieve both strong thermal insulation effect and low cost.

[0134] In some embodiments, please refer to Figure 9 , Figure 9This is an assembly diagram of the first casing wall 13, the elastic member 4, and the heat insulation member 3 provided in some embodiments of this application. The battery device 10 also includes the elastic member 4, which is arranged and connected to the heat insulation member 3 along the first direction X. Along the first direction X, one of the heat insulation member 3 and the elastic member 4 is connected to the first protrusion 133, and the other is used to abut against the second wall 132.

[0135] Alternatively, the heat insulation element 3 can be connected to the first protrusion 133, and the elastic element 4 can abut against the second wall 132. When the first wall 131 and the second wall 132 are deformed by external force, the elastic element 4 is compressed. After the external force decreases or disappears, the elastic element 4 can press the first wall 131 and the second wall 132 outward along the first direction X, bringing the first wall 131 and the second wall 132 closer to their pre-deformation positions.

[0136] In this embodiment, by setting one of the elastic member 4 and the heat insulation member 3 to be connected to the first protrusion 133 and the other to abut against the second wall 132, the setting of the elastic member 4 and the heat insulation member 3 can simultaneously improve the heat insulation effect between the first protrusion 133 and the second wall 132 and improve the buffering capacity between the first wall 131 and the second wall 132, thereby reducing the risk of stress concentration caused by vibration or thermal expansion during the use of the battery device 10.

[0137] In some embodiments, please refer to Figure 10 , Figure 10 This is a schematic diagram of the structure of the first box wall 13 provided in some embodiments of this application. The first protrusion 133 and the second protrusion 134 are spaced apart along the second direction Z, which is perpendicular to the first direction X.

[0138] In a projection plane perpendicular to the first direction X, the orthographic projections of the first protrusion 133 and the second protrusion 134 do not overlap, so that the first protrusion 133 and the second protrusion 134 are spaced apart along the second direction Z.

[0139] In this embodiment, the first protrusion 133 and the second protrusion 134 are misaligned along the second direction Z, which reduces the risk of contact between the first protrusion 133 and the second protrusion 134 and helps to improve the thermal insulation performance of the first wall 131 and the second wall 132.

[0140] In some embodiments, please continue to refer to Figure 10 In a projection plane perpendicular to the second direction Z, a portion of the orthographic projection of the first protrusion 133 and a portion of the orthographic projection of the second protrusion 134 overlap.

[0141] Along the first direction X, the distance between the first protrusion 133 and the second wall 132 is less than the size of the second protrusion 134, and the distance between the second protrusion 134 and the first wall 131 is less than the size of the first protrusion 133.

[0142] In this embodiment, the first protrusion 133 and the second protrusion 134 have a relatively long dimension between the first wall 131 and the second wall 132, which is beneficial to improving the deformation resistance of the first box wall 13.

[0143] In some embodiments, please refer to Figure 11 , Figure 11 for Figure 10 A magnified view of a portion of region B. The minimum distance between the first protrusion 133 and the second wall 132 is greater than or equal to 0.5 mm, and the minimum distance between the second protrusion 134 and the first wall 131 is greater than or equal to 0.5 mm.

[0144] The distance between the first protrusion 133 and the second wall 132 is L2, which can be 0.5mm, 1mm, 2mm, 3mm, 5mm, 10mm, 20mm, 30mm, 40mm, etc.

[0145] The distance between the second protrusion 134 and the first wall 131 is L3, which can be 0.5mm, 1mm, 2mm, 3mm, 5mm, 10mm, 20mm, 30mm, 40mm, etc.

[0146] In this embodiment, the minimum distance between the first protrusion 133 and the second wall 132 is greater than or equal to 0.5 mm, and the minimum distance between the second protrusion 134 and the first wall 131 is greater than or equal to 0.5 mm, which helps to improve the thermal insulation effect between the first wall 131 and the second wall 132 and improve the heat preservation performance of the battery device 10.

[0147] In some embodiments, please refer to Figure 12 , Figure 12 This is a schematic diagram of the structure of the first box wall 13 provided in some embodiments of this application. The first protrusion 133 extends from the first wall 131 toward the direction close to the second wall 132, and the extension direction of the first protrusion 133 is set at an acute angle to the first direction X.

[0148] The extension direction of the first protrusion 133 is set at an acute angle to the first direction X, so that the first protrusion 133 is inclined on the first wall 131. In embodiments where there are multiple first protrusions 133, the extension directions of the multiple first protrusions 133 may be the same or different.

[0149] In this embodiment, by setting the extension direction of the first protrusion 133 to be at an acute angle to the first direction X, when the first protrusion 133 is compressed, the first protrusion 133 can generate a certain elastic deformation along its extension direction, thereby absorbing part of the impact energy, reducing the risk of rigid collision between the first wall 131 and the second wall 132, and further improving the structural stability and impact resistance of the battery device 10.

[0150] In some embodiments, please continue to refer to Figure 12 The second protrusion 134 extends from the second wall 132 toward the first wall 131, and the extension direction of the second protrusion 134 is set at an acute angle to the first direction X.

[0151] The extension direction of the second protrusion 134 is set at an acute angle to the first direction X, so that the second protrusion 134 is inclined on the second wall 132. In embodiments where there are multiple second protrusions 134, the extension directions of the multiple second protrusions 134 may be the same or different. In embodiments where both the first protrusion 133 and the second protrusion 134 are set at an acute angle to the first direction X, the extension directions of the first protrusion 133 and the second protrusion 134 may be the same or different.

[0152] In this embodiment, by setting the extension direction of the second protrusion 134 to be at an acute angle to the first direction X, when the second protrusion 134 is pressed, the second protrusion 134 can generate a certain elastic deformation along its extension direction, thereby absorbing part of the impact energy, reducing the risk of rigid collision between the first wall 131 and the second wall 132, and further improving the structural stability and impact resistance of the battery device 10.

[0153] In some embodiments, the air pressure inside the accommodating cavity 13a is less than the standard atmospheric pressure.

[0154] The fact that the air pressure inside the cavity 13a is less than the standard atmospheric pressure makes the air inside the cavity 13a relatively rarefied compared to the air in the environment, thereby reducing the thermal conductivity of the air inside the cavity 13a.

[0155] In this embodiment, the air inside the cavity 13a is thinner, which is beneficial to improving the thermal insulation effect of the first wall 131 and the second wall 132.

[0156] In some embodiments, the cavity 13a is a vacuum.

[0157] In this embodiment, by setting the cavity 13a to a vacuum, the thermal insulation effect of the first wall 131 and the second wall 132 can be further improved.

[0158] In some embodiments, along the first direction X, the battery cell 2 has a first surface facing the first casing wall 13, the first surface being the surface with the largest area among the plurality of outer surfaces of the battery cell 2.

[0159] The battery cell 2 can be a prismatic battery cell 2. The length and height of the battery cell 2 are both greater than its thickness, and the direction in which the thickness of the battery cell 2 extends is the first direction X. Both surfaces of the battery cell 2 perpendicular to the first direction X are the first surfaces.

[0160] In this embodiment, when the battery cell 2 expands, the battery cell 2 is more likely to squeeze the first housing wall 13. By setting the first protrusion 133 on the surface of the first wall 131 facing the receiving cavity 13a and the second protrusion 134 on the surface of the second wall 132 facing the receiving cavity 13a, the risk of the first wall 131 and the second wall 132 coming into contact can be further reduced, and the structural strength of the first housing wall 13 can be improved.

[0161] This application provides an electrical device, including the battery device 10 provided in any of the above embodiments.

[0162] Please continue to refer to Figure 7This application provides a battery device 10, including a housing 1, a battery cell 2, and a heat insulation component 3. The housing 1 has a first housing wall 13. The battery cell 2 is housed within the housing 1, and the battery cell 2 is located on one side of the first housing wall 13 along a first direction X. The first housing wall 13 has a receiving cavity 13a, and includes a first wall 131 and a second wall 132 arranged along the first direction X. The receiving cavity 13a is located between the first wall 131 and the second wall 132. The surface of the first wall 131 facing the receiving cavity 13a has a plurality of first protrusions 133, and the surface of the second wall 132 facing the receiving cavity 13a has a plurality of second protrusions 134. The first protrusions 133 and the first wall 131 do not contact the second protrusions 134, and the second wall 132 does not contact the first protrusions 133. Along the first direction X, each first protrusion 133 and each second protrusion 134 are arranged opposite to each other and spaced apart. Along the first direction X, at least a portion of the heat insulation member 3 is located between the first protrusion 133 and the second protrusion 134. The first protrusion 133 includes a first protruding body 1331 and a plurality of first protrusions 1332. Along the first direction X, the first protruding body 1331 is disposed on the surface of the first wall 131 facing the receiving cavity 13a, and the plurality of first protrusions 1332 are disposed at intervals on one end of the first protruding body 1331 facing the heat insulation member 3, and are connected to the heat insulation member 3. The second protrusion 134 includes a second protruding body 1341 and a plurality of second protrusions 1342. Along the first direction X, the second protruding body 1341 is disposed on the surface of the second wall 132 facing the receiving cavity 13a, and the plurality of second protrusions 1342 are disposed at intervals on one end of the second protruding body 1341 facing the heat insulation member 3, and are connected to the heat insulation member 3. The heat insulation member 3 corresponds one-to-one with the first protrusion 133.

[0163] By ensuring that the first protrusion 133 and the first wall 131 do not contact the second protrusion 134, and that the second wall 132 does not contact the first protrusion 133, the thermal insulation effect between the first wall 131 and the second wall 132 is improved. This is beneficial for the heat preservation of the battery cell 2 and reduces the influence of the external ambient temperature on the temperature of the battery cell 2. Furthermore, when the first wall 131 or the second wall 132 is deformed by external force, the first protrusion 133 and the second protrusion 134 can abut against the first wall 131 and the second wall 132, maintaining a certain distance between them. This ensures that the first casing wall 13 maintains high structural strength and reduces the risk of damage to the first casing wall 13. Such a battery device 10 balances heat preservation performance and structural strength, improving the performance and reliability of the battery cell 2. When the first wall 13 is subjected to external pressure, on the one hand, the first protrusion 133 and the second protrusion 134 can abut against each other and jointly support the first wall 131 and the second wall 132, reducing the risk of direct contact between the first wall 131 and the second wall 132, thereby improving the structural strength of the battery device 10; on the other hand, along the first direction X, the first protrusion 133 and the second protrusion 134 can have a smaller size, which is beneficial to improving the structural strength of the first protrusion 133 and the second protrusion 134 and reducing the risk of the first protrusion 133 and the second protrusion 134 breaking or excessively deforming under pressure. By setting at least a portion of the heat insulation member 3 between the first protrusion 133 and the second protrusion 134, on the one hand, the heat insulation member 3 can improve the thermal insulation effect of the first protrusion 133 and the second protrusion 134, further reducing the risk of heat transfer between the first wall 131 and the second wall 132; on the other hand, when the first wall 131 or the second wall 132 is deformed by external force, the heat insulation member 3 can remain between the first protrusion 133 and the second wall 132, thereby reducing the risk of thermal connection between the first protrusion 133 and the second protrusion 134, and further improving the heat preservation performance of the battery device 10.

[0164] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0165] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery device, characterized in that, include: The box body has a first box wall; A battery cell is housed within the housing, and the battery cell is located on one side of the first housing wall along a first direction; The first box wall has a receiving cavity. The first box wall includes a first wall and a second wall arranged along a first direction. The receiving cavity is located between the first wall and the second wall. The surface of the first wall facing the receiving cavity is provided with a first protrusion. The surface of the second wall facing the receiving cavity is provided with a second protrusion. The first protrusion and the first wall do not contact the second protrusion. The second wall does not contact the first protrusion.

2. The battery device as claimed in claim 1, characterized in that, Along the first direction, each of the first protrusions and the second protrusion are arranged opposite to each other and spaced apart.

3. The battery device as claimed in claim 2, characterized in that, The first wall is provided with a plurality of first protrusions, which are spaced apart on the surface of the first wall facing the receiving cavity. The second wall is provided with a plurality of second protrusions on the surface of the second wall facing the receiving cavity, and the second protrusions correspond one-to-one with the first protrusions.

4. The battery device as claimed in claim 2, characterized in that, The minimum distance between the first protrusion and the second protrusion is greater than or equal to 0.5 mm.

5. The battery device as claimed in claim 2, characterized in that, The battery device further includes a heat insulation member, at least a portion of which is located between the first protrusion and the second protrusion along the first direction.

6. The battery device as claimed in claim 5, characterized in that, The heat insulation component is connected to the first protrusion.

7. The battery device as claimed in claim 6, characterized in that, Along the first direction, the first protrusion engages with the heat insulation component.

8. The battery device as claimed in claim 6, characterized in that, Along the first direction, the first protrusion is bonded to the heat insulation component.

9. The battery device as claimed in claim 6, characterized in that, The first protrusion includes a first protruding body and a plurality of first protrusions. Along the first direction, the first protruding body is disposed on the surface of the first wall facing the receiving cavity, and the plurality of first protrusions are disposed at intervals on one end of the first protruding body facing the heat insulation member. The plurality of first protrusions are connected to the heat insulation member.

10. The battery device as claimed in claim 9, characterized in that, The second protrusion includes a second protruding body and a plurality of second protrusions. Along the first direction, the second protruding body is disposed on the surface of the second wall facing the receiving cavity, and the plurality of second protrusions are disposed at intervals on one end of the second protruding body facing the heat insulation member. The plurality of second protrusions are connected to the heat insulation member.

11. The battery device as claimed in claim 10, characterized in that, Along the first direction, the end face area of ​​the first protrusion connected to one end of the first protruding body is greater than the end face area of ​​the first protrusion connected to the end of the heat insulation member; and / or, Along the first direction, the end face area of ​​the second protrusion connected to one end of the second protruding body is greater than the end face area of ​​the second protrusion connected to one end of the heat insulation member.

12. The battery device as claimed in claim 5, characterized in that, The first wall is provided with a plurality of first protrusions, which are spaced apart on the surface of the first wall facing the receiving cavity; Wherein, along the first direction, the heat insulation element is located between a plurality of first protrusions and second protrusions; or, the battery device includes a plurality of heat insulation elements, each corresponding to one of the first protrusions.

13. The battery device as claimed in claim 5, characterized in that, The thermal conductivity of the insulation component is less than that of the first box wall.

14. The battery device as claimed in claim 13, characterized in that, The thermal conductivity of the insulation component is 0.003 W / (m·K) - 0.2 W / (m·K).

15. The battery device as claimed in claim 5, characterized in that, The insulation material is aerogel, ceramic fiber, or glass wool.

16. The battery device as claimed in claim 5, characterized in that, The battery device further includes an elastic element, which is arranged and connected to the heat insulation element along the first direction. Along the first direction, one of the heat insulation element and the elastic element is connected to the first protrusion, and the other is used to abut against the second wall.

17. The battery device as claimed in claim 1, characterized in that, The first protrusion and the second protrusion are spaced apart along a second direction, which is perpendicular to the first direction.

18. The battery device as claimed in claim 17, characterized in that, In a projection plane perpendicular to the second direction, a portion of the orthographic projection of the first protrusion overlaps with a portion of the orthographic projection of the second protrusion.

19. The battery device as claimed in claim 17, characterized in that, The minimum distance between the first protrusion and the second wall is greater than or equal to 0.5 mm, and the minimum distance between the second protrusion and the first wall is greater than or equal to 0.5 mm.

20. The battery device according to any one of claims 1-19, characterized in that, The first protrusion extends from the first wall toward the direction close to the second wall, and the extending direction of the first protrusion forms an acute angle with the first direction; and / or, The second protrusion extends from the second wall toward the first wall, and the extension direction of the second protrusion is set at an acute angle to the first direction.

21. The battery device according to any one of claims 1-19, characterized in that, The air pressure inside the containment cavity is less than the standard atmospheric pressure.

22. The battery device as claimed in claim 21, characterized in that, The cavity is a vacuum.

23. The battery device as claimed in any one of claims 1-19, characterized in that, Along the first direction, the battery cell has a first surface facing the first casing wall, and the first surface is the surface with the largest area among the plurality of outer surfaces of the battery cell.

24. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-23.

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