Battery box body, battery device and power utilization device

Abstract

The embodiment of the utility model provides a battery box body, a battery device and a power utilization device, the battery device comprises a battery monomer and a battery box body, the battery box body defines a mounting space, the battery monomer is located in the mounting space, the battery box body comprises a buffer part, the buffer part comprises a base material part and a buffer piece, the base material part is of an integrally formed structure, and the buffer piece is located in the base material part. The buffering piece is embedded in the base material part, and a cavity is formed in the buffering piece. According to the battery box disclosed by the embodiment of the invention, under the condition that the battery box is collided, the buffer part is preferably deformed, so that the probability that structures of other areas of the battery box invade into the internal space of the battery box is reduced; collision energy can be conducted to the whole buffer part, so that the deformation amplitude of the buffer part is reduced; and meanwhile, the structure of the buffer part intrudes into the original space of the cavity, and the buffer part absorbs a part of collision energy in a deformation manner, so that the probability that the structure of the buffer part intrudes into the internal space of the battery box body is reduced.

Description

Technical Field

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

[0002] The battery device includes a battery housing and multiple battery cells. The battery housing has an enclosing space where the battery cells are stored, so that the battery housing can provide a certain degree of protection for the battery cells.

[0003] In some usage scenarios, the battery box is prone to collisions with external objects. After the battery box is hit, the collision energy may be transferred to the individual battery cells, and some parts of the battery box structure may deform and intrude into the internal space, which can easily cause damage to the individual battery cells and thermal runaway. Utility Model Content

[0004] In view of this, embodiments of this application aim to provide a battery housing, battery device, and electrical device that are advantageous for absorbing collision energy in the event of a collision.

[0005] To achieve the above objectives, the technical solution of this application embodiment is implemented as follows:

[0006] This application provides a battery device, which includes a battery cell and a battery housing. The battery housing encloses an installation space, and the battery cell is located within the installation space. The battery housing includes a buffer portion, which includes a base material portion and a buffer member. The base material portion is an integrally formed structure, and the buffer member is embedded in the base material portion. The buffer member has a cavity inside.

[0007] In this embodiment of the battery housing, a buffer member with a cavity embedded in the base material is provided. When the battery housing is impacted, the buffer member is preferentially deformed, which helps to keep the deformation area of ​​the battery housing within a preset range. This reduces the probability of other areas of the battery housing intruding into the internal space of the battery housing. It also facilitates the conduction of impact energy to the entire buffer member, thereby reducing the deformation amplitude of the buffer member. At the same time, by allowing the structure of the buffer member to intrude into the original space of the cavity, the buffer member absorbs a portion of the impact energy through deformation, further reducing the probability of the buffer member's structure intruding into the internal space of the battery housing and lowering the risk of thermal runaway in the battery device.

[0008] In some embodiments, the battery housing includes multiple sub-housings that together enclose the mounting space. Each sub-housing includes a first housing, and the buffer portion is located within the first housing. A portion of the surface of the base material forms at least a portion of the inner wall of the mounting space, and a portion of the surface of the base material forms at least a portion of the outer surface of the battery housing. This facilitates direct contact between the base material and the colliding object during a collision, allowing the collision energy to be directly transferred to the buffer, causing it to collapse. Simultaneously, it also allows for a more compact structure for the first housing.

[0009] In some embodiments, the cavity is provided with a first reinforcing rib, which connects the inner walls of the cavity on both sides along the opposite direction of the buffer and the mounting space. The first reinforcing rib can improve the compressive strength of the buffer along the opposite direction of the buffer and the mounting space, and reduce the probability of the buffer deforming when the battery box is subjected to a slight impact.

[0010] And / or, the cavity is provided with a second reinforcing rib, which connects the inner walls of the cavity on both sides perpendicular to the direction between the buffer and the mounting space. The second reinforcing rib can improve the tensile strength of the buffer perpendicular to the direction between the buffer and the mounting space, and reduce the probability of the buffer deforming when the battery box is subjected to a slight impact.

[0011] In some embodiments, the direction of the buffer member relative to the mounting space is perpendicular to the extension direction of the cavity, and the projected shape of the cavity is circular in a projection plane perpendicular to the extension direction of the cavity. This reduces the probability of the buffer member cracking due to stress concentration during long-term use of the battery device, thus lowering the risk of reduced energy absorption efficiency due to cracks.

[0012] In some embodiments, the relative direction of the buffer member and the mounting space and the extension direction of the cavity are perpendicular to each other. The dimension of the cavity perpendicular to the relative direction of the buffer member and the mounting space is a first dimension, and the dimension of the cavity along the relative direction of the buffer member and the mounting space is a second dimension, wherein the first dimension is larger than the second dimension. This facilitates increasing the protection range of the buffer portion on the first housing; simultaneously, the smaller dimension of the buffer portion along the relative direction of the buffer member and the mounting space allows for a more compact structure of the buffer portion, improving the utilization rate of the internal space of the substrate.

[0013] In some embodiments, the first housing includes a side enclosure and a plate-shaped portion. The side enclosure surrounds the peripheral edge of the plate-shaped portion, and the side enclosure and the plate-shaped portion together form a mounting cavity. The mounting cavity forms at least a portion of the mounting space. The side enclosure is provided with the buffer portion, which helps to reduce the probability that the side enclosure will deform and intrude into the original space of the mounting cavity in the event of a collision, thereby reducing the chance of the battery device being damaged by a collision.

[0014] And / or, the plate-shaped portion is provided with the buffer portion, which helps to reduce the probability that the plate-shaped portion will deform and intrude into the original space of the mounting cavity when it is hit, thereby reducing the chance of the battery device being damaged by impact.

[0015] In some embodiments, the buffer includes a first buffer sub-component, the cavity includes a first sub-cavity, the first sub-cavity is located within the first buffer sub-component, the mounting cavity is open on one side along a second direction, the side enclosure is provided with the first buffer sub-component, the first buffer sub-component is located on one side of the mounting cavity along a first direction, the first direction is perpendicular to the second direction, and in the first direction, at least a portion of the projection of the first sub-cavity is located within the projection range of the mounting cavity. This is advantageous because, in the event of a collision along the first direction, the structure of the buffer portion facing away from the first sub-cavity along the first direction can penetrate into the original space of the first sub-cavity, better absorbing some of the collision energy through deformation, and reducing the probability of the side enclosure deforming and penetrating into the original space of the mounting cavity.

[0016] In some embodiments, in the first direction, the projection of the first sub-cavity is completely within the projection range of the mounting cavity, the dimension of the first sub-cavity along the second direction is a third dimension, and the dimension of the mounting cavity along the second direction is a fourth dimension, the ratio of the third dimension to the fourth dimension is not less than 0.8. This helps to increase the protection range of the buffer portion along the second direction of the side enclosure, reducing the probability of the side enclosure deforming and intruding into the original space of the mounting cavity.

[0017] In some embodiments, the cavity extends along a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other. In the first direction, the projection of the first sub-cavity is completely within the projection range of the mounting cavity. The dimension of the first sub-cavity along the third direction is a fifth dimension, and the dimension of the mounting cavity along the third direction is a sixth dimension. The ratio of the fifth dimension to the sixth dimension is not less than 0.7. This helps to increase the protection range of the buffer portion along the third direction of the side enclosure, reducing the probability of the side enclosure deforming and intruding into the original space of the mounting cavity.

[0018] In some embodiments, the buffer includes a second buffer sub-component, the cavity includes a second sub-cavity, the second sub-cavity is located within the second buffer sub-component, the mounting cavity is open on one side along a second direction, the plate-shaped portion is provided with the second buffer sub-component, the second buffer sub-component is located on the side of the mounting cavity opposite to its open position along the second direction, and at least a portion of the projection of the second sub-cavity is located within the projection range of the mounting cavity in the second direction. This is advantageous because, in the event of a collision along the second direction, the structure of the buffer portion on the side opposite to the second sub-cavity along the first direction can penetrate into the original space of the second sub-cavity, better absorbing some of the collision energy through deformation, and reducing the probability of the plate-shaped portion deforming and penetrating into the original space of the mounting cavity.

[0019] In some embodiments, the side circumference is provided with the buffer member; and / or, the plate-shaped portion is provided with the buffer member. This makes it easier to increase the size of the cavity within a limited space, and more conducive to the transmission of impact forces to the buffer member; it also helps to reduce the probability that the buffer member will shift due to deformation caused by an impact to the base material portion, thus preventing deformation of the buffer member.

[0020] In some embodiments, the wall thickness of the buffer is between 0.7 mm and 1.3 mm. This has two advantages: firstly, it allows the structural strength of the buffer to support the portion of the base material stacked on top of it along the direction of gravity, reducing the probability of deformation of the buffer in the event of no collision or minor collision; secondly, it allows the structural strength of the buffer to withstand deformation under more severe collisions with the battery box.

[0021] In some embodiments, the distance between the outer surface of the buffer and the surface of the nearest substrate portion is not less than 1.8 mm. This ensures that the structural strength of the substrate portion itself is sufficient to support the mass of the buffer, reducing the deformation amplitude of the substrate portion due to the weight of the buffer portion itself; it also reduces the risk of the buffer portion penetrating the substrate portion after long-term use of the battery device, thereby reducing the probability of the buffer portion being exposed outside the battery housing.

[0022] In some embodiments, at least a portion of the surface of the substrate forms at least a portion of the outer surface of the battery housing. This facilitates direct contact between the substrate and the colliding object during a collision, allowing the collision energy to be directly transferred to the buffer, thereby reducing the likelihood of the battery housing breaking due to the impact.

[0023] In some embodiments, the buffer is a metal structure. This allows the plastic deformation of metal under external force to be utilized, enabling the buffer to absorb some of the impact energy when directly impacted or when an external object impacts other areas of the battery housing and transmits the impact force to the buffer.

[0024] In some embodiments, the base material is a first metal material, the buffer material is a second metal material, and the base material is a cast, integral structure. The melting point of the first metal material is lower than that of the second metal material. Casting is a mature manufacturing process that facilitates large-scale production.

[0025] This application embodiment also provides a battery box, the battery box including a buffer part, the buffer part including a base material part and a buffer member, the base material part is an integrally formed structure, the buffer member is embedded in the base material part, and the buffer member has a cavity inside.

[0026] In this way, when the battery box is impacted, the buffer part is more likely to deform first, thus keeping the deformation area of ​​the battery box within a preset range and reducing the probability of other areas of the battery box intruding into the installation space. It also facilitates the transmission of impact energy to the entire buffer component, thereby reducing the deformation amplitude of the buffer component. At the same time, by allowing the buffer part to intrude into the original space of the cavity, the buffer part absorbs some of the impact energy through deformation, further reducing the probability of the buffer part's structure intruding into the installation space.

[0027] In some embodiments, the battery housing includes multiple sub-housings that together enclose an installation space. Each sub-housing includes a first housing, and the buffer portion is located within the first housing. A portion of the surface of the base material forms at least a portion of the inner wall of the installation space, and a portion of the surface of the base material forms at least a portion of the outer surface of the battery housing. This design facilitates direct contact between the base material and the colliding object during a collision, allowing the collision energy to be directly transferred to the buffer, causing it to collapse. Simultaneously, it also allows for a more compact structure for the first housing.

[0028] In some embodiments, the first housing includes a side enclosure and a plate-shaped portion. The side enclosure surrounds the peripheral edge of the plate-shaped portion, and the side enclosure and the plate-shaped portion together form a mounting cavity. The mounting cavity forms at least a portion of the mounting space. The side enclosure is provided with the buffer portion, which helps to reduce the probability that the side enclosure will deform and intrude into the original space of the mounting cavity in the event of a collision, thereby reducing the chance of the battery device being damaged by a collision.

[0029] And / or, the plate-shaped portion is provided with the buffer portion, which helps to reduce the probability that the plate-shaped portion will deform and intrude into the original space of the mounting cavity when it is hit, thereby reducing the chance of the battery device being damaged by impact.

[0030] In some embodiments, the buffer includes a first buffer sub-component, the cavity includes a first sub-cavity, the first sub-cavity is located within the first buffer sub-component, the mounting cavity is open on one side along a second direction, the side enclosure is provided with the first buffer sub-component, the first buffer sub-component is located on one side of the mounting cavity along a first direction, the first direction is perpendicular to the second direction, and in the first direction, at least a portion of the projection of the first sub-cavity is located within the projection range of the mounting cavity. This is advantageous because, in the event of a collision along the first direction, the structure of the buffer portion facing away from the first sub-cavity along the first direction can penetrate into the original space of the first sub-cavity, better absorbing some of the collision energy through deformation, and reducing the probability of the side enclosure deforming and penetrating into the original space of the mounting cavity.

[0031] This application also provides an electrical device that includes the battery device described in the foregoing embodiments, the battery device serving as a power source for the electrical device. This reduces the likelihood of the battery device being damaged during a collision between the electrical device and an object.

[0032] In some embodiments, the electrical device is a vehicle, the vehicle includes a body structure, the buffer is located on at least one side of the battery box along the width direction of the body structure, and the cavity extends along the length direction of the body structure, which helps to reduce the risk of vehicle spontaneous combustion caused by battery device damage in the event of a side collision.

[0033] And / or, the buffer is located on at least one side of the battery box along the length of the vehicle body structure, and the cavity extends along the width of the vehicle body structure, which helps to reduce the risk of vehicle spontaneous combustion caused by battery damage in the event of a frontal collision or rear-end collision. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a vehicle according to one embodiment of this application;

[0035] Figure 2 This is an exploded schematic diagram of a battery device in one embodiment of this application;

[0036] Figure 3 This is a schematic diagram of the subshell in the first embodiment of this application from a first perspective;

[0037] Figure 4 for Figure 3A schematic diagram of an embodiment from a second perspective;

[0038] Figure 5 for Figure 4 A cross-sectional view of the Chinese embodiment at position AA;

[0039] Figure 6 for Figure 5 A magnified view of a portion of position B in the diagram;

[0040] Figure 7 This is a partially enlarged cross-sectional view of the subshell in the second embodiment of this application, and its enlarged position is... Figure 5 The position of B in the text is the same;

[0041] Figure 8 This is a partially enlarged cross-sectional view of the sub-shell in the third embodiment of this application, and its enlarged position is... Figure 5 The position of B in the text is the same;

[0042] Figure 9 for Figure 3 A schematic diagram of an embodiment from a third-person perspective;

[0043] Figure 10 for Figure 9 A cross-sectional view of the Chinese embodiment at position CC;

[0044] Figure 11 This is a schematic diagram of the vehicle body structure and battery device in one embodiment of this application.

[0045] Explanation of reference numerals in the attached figures

[0046] 1000, Vehicle; 100, Battery assembly; 200, Controller; 300, Motor; 400, Vehicle body structure; 10, Battery housing; 10a, Installation space; 11, Buffer section; 111, Base material section; 112, Buffer component; 112a, Cavity; 1121, First reinforcing rib; 1122, Second reinforcing rib; 1123, First buffer sub-component; 1123a, First sub-cavity; 1124, Second buffer sub-component; 1124a, Second sub-cavity; 12, Sub-shell; 13, First shell; 13a, Mounting cavity; 131, Side panel; 132, Plate-shaped section; 14, First housing; 15, Second housing; 20, Battery cell. Detailed Implementation

[0047] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific implementation should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0048] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0049] In the description of the embodiments of this application, technical terms such as "first," "second," and "third" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0050] In this document, the term "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 throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] In the description of the embodiments 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, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0052] In the description of the embodiments in this application, for ease of explanation, as follows: Figure 3 , Figure 5 , Figures 6 to 8 , Figure 10 As shown, the direction of arrow X is taken as the "first direction"; as... Figure 3 , Figures 5 to 8 As shown, the direction of arrow Y is defined as the "second direction" and the "vertical direction"; as... Figure 3 , Figure 10 and Figure 11 As shown, the direction of arrow Z is defined as the "third direction".

[0053] In the description of the embodiments of this application, unless otherwise expressly specified and limited, 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0054] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0055] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0056] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0057] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0058] 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.

[0059] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0060] As an example, a battery cell assembly 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.

[0061] In some embodiments, see Figure 2The battery device can be a battery pack, which includes a battery housing 10 and one or more battery cell assemblies, with the battery cell assemblies housed in the battery housing 10.

[0062] As an example, the battery cell assembly can be a battery module, which can be housed in the battery housing 10 by fixing the battery module in the battery housing 10.

[0063] As an example, the battery cell assembly can also be housed in the battery housing 10 by directly fixing multiple battery cells 20 to the battery housing 10.

[0064] As an example, see Figure 2 The battery housing 10 may include a first housing 14 and a second housing 15. The first housing 14 and the second housing 15 are fastened together to form a closed space inside the battery housing 10 to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 14 may be a top cover or a bottom plate.

[0065] As an example, the battery housing 10 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the battery housing 10 forms an enclosed space to accommodate individual battery cells.

[0066] In some embodiments, the battery housing 10 may be part of the vehicle's chassis structure. For example, a portion of the battery housing 10 may be at least a portion of the vehicle's floor, or a portion of the battery housing 10 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0067] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0068] In the following embodiments, for ease of explanation, a vehicle 1000 is used as an example of an electrical device according to an embodiment of this application. The description is as follows with reference to the accompanying drawings.

[0069] Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in one embodiment of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. Figure 1As shown, a battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0070] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0071] The embodiments of this application will now be described in detail.

[0072] In related technologies, battery housings are used to protect other components of the battery device.

[0073] When a battery pack collides with an external object, due to factors such as design dimensions, shape, and manufacturing errors, different parts of the battery casing exhibit varying strengths. Under the impact force, some parts of the battery casing deform more significantly than others, making them more susceptible to intrusion into the internal space and collision with the individual battery cells. Thus, even if the colliding object fails to penetrate the battery casing, it may still damage the individual battery cells, leading to thermal runaway.

[0074] Based on the aforementioned technical problems, this application aims to provide a battery device in which the battery housing includes a base material and a buffer member, the buffer member being embedded within the base material and having a cavity within it. Thus, in the event of a collision, the low structural strength of the cavity facilitates preferential deformation of the buffer member. This deformation allows for the absorption of some of the collision energy and reduces the probability of other parts of the base material deforming and intruding into the internal space of the battery housing.

[0075] Specifically, see Figures 2 to 6 This application provides a battery device 100, which includes a battery cell 20 and a battery housing 10. The battery housing 10 encloses an installation space 10a, and the battery cell 20 is located within the installation space 10a.

[0076] The battery housing 10 includes a buffer section 11, which includes a base material section 111 and a buffer member 112. The base material section 111 is an integrally formed structure, and the buffer member 112 is embedded in the base material section 111. The buffer member 112 has a cavity 112a inside.

[0077] The substrate 111 is a one-piece molded structure, which means that the substrate 111 itself is a single part manufactured by processes such as casting, injection molding, and additive manufacturing.

[0078] The buffer 112 is embedded in the substrate portion 111, which means that the buffer 112 is completely wrapped inside the substrate portion 111, so that the buffer 112 cannot be observed from the outside of the buffer portion 11 macroscopically.

[0079] The substrate 111 is a one-piece molded structure, which eliminates the need to splice multiple structural parts to form the substrate 111. As a result, no seam is formed in the substrate 111 that connects the outside of the buffer part 11 to the space inside the substrate 111 that encloses the buffer member 112. External air and water are difficult to enter the space inside the substrate 111 that encloses the buffer member 112 and come into contact with the buffer member 112.

[0080] It is understandable that the base material 111 fits against the buffer 112 from all directions, thereby serving to limit and fix the buffer 112.

[0081] The cavity 112a inside the buffer 112 weakens the overall structural strength of the buffer 112 on the one hand, and provides space for the deformation of the structure of the buffer 112 on the other hand.

[0082] Understandably, the presence of cavity 112a makes the overall structural strength of buffer 112 significantly lower than that of other parts of battery housing 10. Thus, during a collision with battery housing 10, buffer 11 deforms preferentially, and the side of buffer 11 closest to the colliding object can intrude into the original space of cavity 112a, while the side of buffer 11 furthest from the colliding object experiences reduced deformation due to the force transmission path being blocked by cavity 112a.

[0083] In this embodiment of the application, the battery housing 10 has a buffer member 112 with a cavity 112a embedded in the base material portion 111. When the battery housing 10 is impacted, the buffer member 111 is preferentially deformed, which helps to keep the deformation area of ​​the battery housing 10 within a preset range and reduces the probability of other areas of the battery housing 10 intruding into the installation space 10a. It also facilitates the conduction of impact energy to the entire buffer member 112, thereby reducing the deformation amplitude of the buffer member 112. At the same time, the structure of the buffer member 11 intrudes into the original space of the cavity 112a, realizing the function of the buffer member 11 absorbing a part of the impact energy through deformation, reducing the probability of the structure of the buffer member 11 intruding into the internal space of the battery housing 10, and reducing the risk of thermal runaway of the battery device 100.

[0084] Understandably, the cavity 112a is enclosed inside the buffer section 11, which reduces the risk of foreign objects entering the cavity 112a and causing deformation of the structure of the buffer section 11 during long-term use of the battery device 100.

[0085] In some embodiments, see Figure 2 The battery housing 10 includes multiple sub-housing units 12, which together enclose an installation space 10a.

[0086] The installation space 10a is used to arrange other components in the battery device 100, and the battery housing 10 protects the other components in the battery device 100.

[0087] Multiple sub-shells 12 are assembled to form a battery housing 10 so that other components in the battery device 100 can be transferred in during the assembly process.

[0088] In some embodiments that include a sub-housing 12 and a mounting space 10a, see [reference needed]. Figures 3 to 6 The sub-shell 12 includes a first shell 13, a buffer portion 11 located in the first shell 13, a portion of the surface of the base material portion 111 forming at least a portion of the inner wall of the mounting space 10a, and a portion of the surface of the base material portion 111 forming at least a portion of the outer surface of the battery box 10.

[0089] The first housing 13 is a sub-housing 12 among multiple sub-housing 12 that has a buffer section 11. It can be a part of the multiple sub-housing 12 that is the first housing 13, or it can be all of the multiple sub-housing 12 that are the first housing 13.

[0090] This allows the base material 111 to directly contact the colliding object during the collision process, thereby facilitating the direct transfer of collision energy to the buffer 112, causing the buffer 112 to collapse; at the same time, it also helps to make the structure of the first shell 13 more compact.

[0091] It is understandable that the base material 111 isolates the buffer 112 from the mounting space 10a.

[0092] In some embodiments, see Figure 7 The cavity 112a is provided with a first reinforcing rib 1121, which connects the inner walls of the cavity 112a on both sides along the opposite direction of the buffer member 112 and the installation space 10a.

[0093] Thus, the first reinforcing rib 1121 can improve the compressive strength of the buffer 112 in the direction relative to the mounting space 10a, and reduce the probability of the buffer 112 deforming when the battery box 10 is subjected to a slight impact.

[0094] It should be noted that the relative direction between the buffer 112 and the mounting space 10a is only to describe the relative direction between a single buffer 112 and the mounting space 10a, and does not refer to a specific direction.

[0095] It is understood that in embodiments where there are multiple buffers 112, the relative orientations between the different buffers 112 and the mounting space 10a are different.

[0096] In some embodiments, the first reinforcing rib 1121 divides the space within the cavity 112a into multiple sub-cavities, which are interconnected to allow the buffer 112 to deform during a collision.

[0097] In some embodiments, see Figure 7 The cavity 112a is provided with a second reinforcing rib 1122, which connects the inner walls of the cavity 112a on both sides perpendicular to the direction of the buffer 112 and the mounting space 10a.

[0098] Thus, the second reinforcing rib 1122 can increase the tensile strength of the buffer 112 in the direction perpendicular to the relative direction between the buffer 112 and the mounting space 10a, reducing the probability of the buffer 112 deforming when the battery box 10 is subjected to a slight impact.

[0099] In some embodiments, the second reinforcing rib 1122 divides the space within the cavity 112a into multiple sub-cavities, which are interconnected to allow the buffer 112 to deform during a collision.

[0100] In some embodiments, see Figure 7 The cavity 112a is provided with a first reinforcing rib 1121 and a second reinforcing rib 1122.

[0101] In some embodiments, see Figure 8The relative direction between the buffer 112 and the mounting space 10a is perpendicular to the extension direction of the cavity 112a. In the projection plane perpendicular to the extension direction of the cavity 112a, the projected shape of the cavity 112a is circular.

[0102] This reduces the probability of the buffer 112 cracking due to stress concentration during long-term use of the battery device 100, and lowers the risk of reduced energy absorption effect due to cracks in the buffer 112.

[0103] In some embodiments, see Figures 5 to 8 The relative direction of the buffer 112 and the mounting space 10a is perpendicular to the extension direction of the cavity 112a. The dimension of the cavity 112a perpendicular to the relative direction of the buffer 112 and the mounting space 10a is the first dimension, and the dimension of the cavity 112a along the relative direction of the buffer 112 and the mounting space 10a is the second dimension. The first dimension is greater than the second dimension. That is, D1 > D2.

[0104] This is beneficial to increase the protection range of the buffer part 11 on the first housing 13; at the same time, the size of the buffer part 11 in the direction relative to the buffer member 112 and the mounting space 10a is smaller, which is beneficial to make the structure of the buffer part 11 more compact and improve the utilization rate of the space inside the base material part 111.

[0105] The specific method for measuring the first and second dimensions is not limited. For example, in an environment with a room temperature of 25°C, a portion of the buffer portion 11 is cut out perpendicular to the extending direction of the cavity 112a to obtain a cross-section of the portion of the buffer member 112 and the base material portion 111 that forms the inner wall of the mounting space 10a. The relative direction of the buffer member 112 and the mounting space 10a is determined according to the edges of the buffer member 112 and the base material portion 111. The reference position of the main scale of the vernier caliper is placed against the inner wall of the cavity 112a on one side of the inner wall perpendicular to the relative direction of the buffer member 112 and the mounting space 10a. The vernier is moved so that the reference position of the vernier is against the inner wall on the other side. The value of the vernier caliper is read to obtain the value of the first dimension. The reference position of the main scale of the vernier caliper is placed against the inner wall of the cavity 112a on one side of the inner wall along the relative direction of the buffer member 112 and the mounting space 10a. The vernier is moved so that the reference position of the vernier is against the inner wall on the other side. The value of the vernier caliper is read to obtain the value of the second dimension.

[0106] In some embodiments, see Figure 3 and Figure 4 The first housing 13 includes a side enclosure 131 and a plate-shaped portion 132. The side enclosure 131 surrounds the peripheral edge of the plate-shaped portion 132. The side enclosure 131 and the plate-shaped portion 132 together form a mounting cavity 13a, which forms at least a portion of the mounting space 10a.

[0107] The side enclosure 131 is used for connection with other sub-housings 12. The mounting cavity 13a is used to accommodate other components in the battery device 100. The plate-shaped portion 132 is used to support other components in the battery device 100.

[0108] In some embodiments, see Figures 6 to 8 The side panel 131 is provided with a buffer section 11.

[0109] This helps to reduce the probability that the side portion 131 will deform and intrude into the original space of the mounting cavity 13a when it is hit, thus reducing the chance of the battery device 100 being damaged by a collision.

[0110] In some embodiments, see Figures 6 to 8 The plate-shaped part 132 is provided with a buffer part 11.

[0111] This helps to reduce the probability that the plate-shaped portion 132 will deform and intrude into the original space of the mounting cavity 13a when it is hit, thus reducing the chance of the battery device 100 being damaged by a collision.

[0112] In some embodiments, see Figures 5 to 8 The relative direction between the buffer member 112 in the side enclosure 131 and the mounting cavity 13a is the first direction, and the relative direction between the buffer member 112 in the plate-shaped part 132 and the mounting cavity 13a is the second direction.

[0113] In some embodiments, see Figure 5 One side of the mounting cavity 13a is open, and the side enclosure 131 surrounds the open position of the mounting cavity 13a, allowing other components in the battery device 100 to enter the mounting cavity 13a through the open position.

[0114] In some embodiments, see Figures 6 to 8 The buffer 112 includes a first buffer sub-component 1123, the cavity 112a includes a first sub-cavity 1123a, the first sub-cavity 1123a is located inside the first buffer sub-component 1123, the mounting cavity 13a is open on one side along the second direction, the side enclosure 131 is provided with the first buffer sub-component 1123, the first buffer sub-component 1123 is located on one side of the mounting cavity 13a along the first direction, the first direction is perpendicular to the second direction, and in the first direction, at least a portion of the projection of the first sub-cavity 1123a is located within the projection range of the mounting cavity 13a.

[0115] In this way, when subjected to a collision along the first direction, the structure of the buffer part 11 on the side away from the first sub-cavity 1123a along the first direction can penetrate into the original space of the first sub-cavity 1123a, and better absorb some of the collision energy through deformation, thereby reducing the probability that the side part 131 will deform and penetrate into the original space of the mounting cavity 13a.

[0116] See Figure 5 The plate-shaped portion 132 is located on the side of the side enclosure portion 131 away from the open position of the mounting cavity 13a. Therefore, the end of the side enclosure portion 131 near the open position of the mounting cavity 13a is more susceptible to deformation from impacts perpendicular to the opening direction than the end connected to the plate-shaped portion 132.

[0117] In some embodiments, see Figures 6 to 8 In the second direction, the distance between the first sub-cavity 1123a and the end of the side enclosure 131 near the open position of the mounting cavity 13a along the second direction is less than the distance between the first sub-cavity 1123a and the end of the side enclosure 131 away from the open position of the mounting cavity 13a along the second direction.

[0118] This is more conducive to reducing the probability that the end of the side panel 131 near the open position of the mounting cavity 13a will intrude into the original space of the mounting cavity 13a after being hit in the first direction.

[0119] In some embodiments, see Figure 6 In the first direction, the projection of the first sub-cavity 1123a is completely within the projection range of the mounting cavity 13a. The dimension of the first sub-cavity 1123a along the second direction is the third dimension, and the dimension of the mounting cavity 13a along the second direction is the fourth dimension. The ratio of the third dimension to the fourth dimension is not less than 0.8. That is, D3≥0.8·D4.

[0120] This increases the protection range of the buffer section 11 along the second direction of the side enclosure 131, and reduces the probability that the side enclosure 131 will deform and intrude into the original space of the mounting cavity 13a.

[0121] In an embodiment where the relative direction between the first buffer sub-component 1123 and the mounting cavity 13a is the first direction, the first dimension and the third dimension are the same dimension.

[0122] The specific method for measuring the fourth dimension is not limited. For example, in an environment with a room temperature of 25°C, the vernier reference surface of the depth gauge is brought into contact with the end face of the side portion 131 near the open position of the mounting cavity 13a along the second direction. The measuring gauge is moved along the second direction until the end face of the measuring gauge comes into contact with the plate portion 132, and the value of the fourth dimension is obtained by reading the value of the depth gauge.

[0123] It is understandable that the ratio of the third dimension to the fourth dimension is no greater than 1, that is, D3≤D4, so as to make the structure of the side panel 131 more compact.

[0124] In some embodiments, see Figure 4 , Figure 9 and Figure 10 Cavity 112a extends along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. In the first direction, the projection of the first sub-cavity 1123a is completely within the projection range of the mounting cavity 13a. The dimension of the first sub-cavity 1123a along the third direction is the fifth dimension, and the dimension of the mounting cavity 13a along the third direction is the sixth dimension. The ratio of the fifth dimension to the sixth dimension is not less than 0.7. That is, D5 ≥ 0.7·D6.

[0125] This helps to increase the protection range of the buffer part 11 in the third direction along the side wall 131, and reduces the probability that the side wall 131 will deform and intrude into the original space of the mounting cavity 13a.

[0126] The specific method for measuring the fifth and sixth dimensions is not limited. For example, in an environment with a room temperature of 25°C, the sixth dimension is obtained by measuring the dimension of the mounting cavity 13a at its maximum position along the third direction using a ruler; the side enclosure 131 is cut along the third direction to obtain a cross-section of the first sub-cavity 1123a, the maximum position of the first sub-cavity 1123a along the third direction is determined, and the fifth dimension is obtained by measuring the dimension of the first sub-cavity 1123a at its maximum position along the third direction using a ruler.

[0127] It is understandable that the ratio of the fifth dimension to the sixth dimension is no greater than 1, that is, D5≤D6, so as to make the structure of the side panel 131 more compact.

[0128] In some embodiments, see Figures 5 to 8 The buffer member 112 includes a second buffer sub-member 1124, the cavity 112a includes a second sub-cavity 1124a, the second sub-cavity 1124a is located inside the second buffer sub-member 1124, the mounting cavity 13a is open on one side along the second direction, the plate-shaped portion 132 is provided with the second buffer sub-member 1124, the second buffer sub-member 1124 is located on the side of the mounting cavity 13a away from its open position along the second direction, and in the second direction, at least a portion of the projection of the second sub-cavity 1124a is located within the projection range of the mounting cavity 13a.

[0129] In this way, when subjected to a collision along the second direction, the structure of the buffer section 11 on the side away from the second sub-cavity 1124a along the first direction can penetrate into the original space of the second sub-cavity 1124a, and better absorb some of the collision energy through deformation, thereby reducing the probability that the plate section 132 will deform and penetrate into the original space of the mounting cavity 13a.

[0130] In some embodiments, see Figures 6 to 8 The side panel 131 is provided with a buffer 112. That is to say, the number of buffers 112 in the side panel 131 is only one, rather than two or more.

[0131] Thus, within a limited space, it is more advantageous to increase the size of the cavity 112a, and more advantageous to transmit the collision force to the buffer 112; it is also advantageous to reduce the probability that the buffer 112 will move and deform when the base material 111 is deformed by a collision.

[0132] In some embodiments, see Figure 5 The plate-shaped portion 132 is provided with a buffer member 112. That is to say, the number of buffer members 112 in the plate-shaped portion 132 is only one, rather than two or more.

[0133] Thus, within a limited space, it is more advantageous to increase the size of the cavity 112a, and more advantageous to transmit the collision force to the buffer 112; it is also advantageous to reduce the probability that the buffer 112 will move and deform when the base material 111 is deformed by a collision.

[0134] In some embodiments, the buffer 112 is a metal structure.

[0135] In this way, by utilizing the property of metal to undergo plastic deformation under external force, the buffer part 11 can absorb a portion of the collision energy through the plastic deformation generated by the buffer part 11 when it is directly impacted or when an external object impacts other areas of the battery box 10 and transmits the impact force to the buffer part 11.

[0136] In some embodiments, the substrate portion 111 is a metal structure. The plastic deformation generated by the substrate portion 111 can absorb a portion of the impact energy.

[0137] The specific manner in which the substrate 111 is formed into an integral molded structure is not limited.

[0138] For example, the material of the base material 111 is a first metal material, the material of the buffer 112 is a second metal material, the base material 111 is a cast integral structure, and the melting point of the first metal material is lower than that of the second metal material.

[0139] The casting method is a mature manufacturing process that facilitates large-scale production.

[0140] The buffer 112 is placed in the cavity of the mold beforehand, and then liquid first metal material is injected into the cavity, while the buffer 112 does not melt. After the first metal material cools down, the base material 111 is obtained.

[0141] In some embodiments, the substrate portion 111 is die-cast to improve the tensile strength and impact resistance of the substrate portion 111.

[0142] In some embodiments, the first metallic material is an aluminum alloy, which has low density, low melting point, and is easy to form.

[0143] In some embodiments, the second metallic material is steel, which has high strength, a high melting point, and is not easily deformed at high temperatures.

[0144] In some embodiments, see Figure 6 The wall thickness of the buffer 112 is 0.7 mm (millimeters) to 1.3 mm. That is, 0.7 mm ≤ D7 ≤ 1.3 mm.

[0145] In this way, on the one hand, it is beneficial to make the structural strength of the buffer 112 able to support the portion of the base material 111 stacked on top of it along the direction of gravity, reducing the probability of the buffer 112 deforming in the event of no collision or minor collision; on the other hand, it is beneficial to make the structural strength of the buffer 112 able to deform in the event of a more severe collision with the battery box 10.

[0146] The wall thickness of the buffer component 112 can be 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, etc.

[0147] The specific method for measuring the wall thickness of the buffer 112 is not limited. For example, in an environment with a room temperature of 25°C, a portion of the buffer section 11 of the battery box 10 is cut out to obtain a complete cross-section of the buffer 112. The reference position of the main scale of the vernier caliper is placed against one side boundary of the buffer 112 along its thickness direction. The vernier is moved so that the reference position of the vernier is against the position closest to the reference position of the main scale at the boundary of the space formed by the buffer 112. The value of the vernier caliper is read, thereby obtaining the wall thickness of the buffer 112.

[0148] In some embodiments, see Figures 6 to 8 The minimum distance between the outer surface of the buffer 112 and the surface of the base material 111 is not less than 1.8 mm. That is, 1.8 mm ≤ D8.

[0149] This ensures that the structural strength of the base material 111 itself is sufficient to support the mass of the buffer 112, reducing the deformation range of the base material 111 due to the weight of the buffer 112 itself; it also reduces the risk that the buffer 112 will penetrate the base material 111 after long-term use of the battery device 100, thereby reducing the probability that the buffer 112 will be exposed outside the battery housing 10.

[0150] The specific value of the minimum distance between the surface of the buffer 112 and the surface of the base material 111 can be 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.5mm, 2.6mm, 2.8mm, 3.0mm, etc.

[0151] The specific method for measuring the minimum distance between the surface of the buffer 112 and the surface of the base material 111 is not limited. For example, in an environment with a room temperature of 25°C, a portion of the buffer 11 of the battery box 10 is cut out to obtain a cross-section including the base material 111 and the buffer 112. On the cross-section, the two points on the buffer 112 cross-section that are closest to the boundary of the base material 111 cross-section away from the boundary of the cavity 112a are found. The reference position of the main scale of the vernier caliper is placed against one of the points, and the vernier is moved so that the reference position of the vernier is against the other point. The value of the vernier caliper is read, thereby obtaining the minimum distance between the surface of the buffer 112 and the surface of the base material 111.

[0152] Some embodiments, see below Figures 5 to 8 At least a portion of the surface of the substrate portion 111 forms at least a portion of the outer surface of the battery housing 10.

[0153] The outer surface of the battery housing 10 refers to the surface of the battery housing 10 that is directly exposed to the outside world. During the process of the battery device 100 colliding with an external object, the outer surface of the battery housing 10 comes into direct contact with the external object.

[0154] This allows the base material 111 to directly contact the colliding object during the collision process, thereby facilitating the direct transfer of collision energy to the buffer 112 and reducing the probability of the battery box 10 being damaged due to the collision.

[0155] The battery device 100 in a specific embodiment of this application is described as follows:

[0156] The battery device 100 includes a battery cell 20 and a battery housing 10. The battery housing 10 encloses an installation space 10a, within which the battery cell 20 is located. The battery housing 10 includes a buffer portion 11, which comprises a base material 111 and a buffer member 112. The base material 111 is a one-piece molded structure, and the buffer member 112 is embedded within it, with an internal cavity 112a. The base material 111 is made of a first metal material, and the buffer member 112 is made of a second metal material. The base material 111 is a cast, one-piece structure, and the melting point of the first metal material is lower than that of the second metal material. The wall thickness of the buffer member 112 is between 0.7 mm and 1.3 mm. The distance between the outer surface of the buffer member 112 and the surface of the nearest base material 111 is not less than 1.8 mm. The battery housing 10 includes multiple sub-housings 12, which together enclose an installation space 10a. Each sub-housing 12 includes a first housing 13, a buffer portion 11 located within the first housing 13, a portion of the surface of a base material portion 111 forming at least a portion of the inner wall of the installation space 10a, and a portion of the surface of the base material portion 111 forming at least a portion of the outer surface of the battery housing 10. The relative direction of the buffer member 112 with respect to the installation space 10a and the extending direction of the cavity 112a are perpendicular to each other. The dimension of the cavity 112a perpendicular to the relative direction of the buffer member 112 with respect to the installation space 10a is a first dimension, and the dimension of the cavity 112a along the relative direction of the buffer member 112 with respect to the installation space 10a is a second dimension, where the first dimension is larger than the second dimension. The first housing 13 includes a side enclosure 131 and a plate-shaped portion 132. The side enclosure 131 surrounds the peripheral edge of the plate-shaped portion 132, and the side enclosure 131 and the plate-shaped portion 132 together form a mounting cavity 13a, which forms at least a portion of the mounting space 10a. The buffer member 112 includes a first buffer sub-member 1123, and the cavity 112a includes a first sub-cavity 1123a, which is located within the first buffer sub-member 1123. The mounting cavity 13a is open on one side along a second direction. The side enclosure 131 is provided with the first buffer sub-member 1123, which is located on one side of the mounting cavity 13a along a first direction. The first direction is perpendicular to the second direction, and at least a portion of the projection of the first sub-cavity 1123a is located within the projection range of the mounting cavity 13a in the first direction. In the first direction, the projection of the first sub-cavity 1123a is completely within the projection range of the mounting cavity 13a. The dimension of the first sub-cavity 1123a along the second direction is the third dimension, and the dimension of the mounting cavity 13a along the second direction is the fourth dimension. The ratio of the third dimension to the fourth dimension is not less than 0.8.Cavity 112a extends along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. In the first direction, the projection of the first sub-cavity 1123a is completely within the projection range of the mounting cavity 13a. The dimension of the first sub-cavity 1123a along the third direction is the fifth dimension, and the dimension of the mounting cavity 13a along the third direction is the sixth dimension. The ratio of the fifth dimension to the sixth dimension is not less than 0.7. The side enclosure 131 has only one first buffer sub-component 1123.

[0157] This application embodiment also provides a battery housing 10, see reference. Figures 3 to 6 The battery box 10 includes a buffer part 11, which includes a base material part 111 and a buffer member 112. The base material part 111 is an integrally formed structure, and the buffer member 112 is embedded in the base material part 111. The buffer member 112 has a cavity 112a inside.

[0158] Thus, when the battery box 10 is impacted, the buffer part 11 is more likely to deform first, thereby keeping the deformation area of ​​the battery box 10 within a preset range and reducing the probability of other areas of the battery box 10 intruding into the installation space 10a. It also facilitates the transmission of impact energy to the entire buffer 112, thereby reducing the deformation amplitude of the buffer 112. At the same time, by allowing the structure of the buffer part 11 to intrude into the original space of the cavity 112a, the buffer part 11 absorbs a portion of the impact energy through deformation, further reducing the probability of the structure of the buffer part 11 intruding into the installation space 10a.

[0159] This application embodiment also provides an electrical device, which includes any of the battery devices 100 in the foregoing embodiments, and the battery devices 100 are used as the power source for the electrical device.

[0160] In this way, the probability of the battery device 100 being damaged due to the collision is reduced during the process of the electrical device colliding with an object.

[0161] In some embodiments, the electrical device is vehicle 1000, see reference. Figure 8 The vehicle 1000 includes a vehicle body structure, and the battery device 100 is disposed in the vehicle body structure.

[0162] The body structure, or the white body of vehicle 1000, is used to house other components in vehicle 1000.

[0163] Thus, by increasing the structural strength of the battery box 10 through the buffer 112, the risk of the battery device 100 spontaneously combusting due to thermal runaway caused by a collision with the vehicle 1000 is reduced.

[0164] In some embodiments, see Figure 11The buffer 112 is located on at least one side of the battery box 10 along the width direction of the vehicle body structure, and the cavity 112a extends along the length direction of the vehicle body structure.

[0165] This helps reduce the risk of vehicle 1000 spontaneously combusting due to damage to battery device 100 in the event of a side collision.

[0166] In some embodiments, the buffer 112 is located on at least one side of the battery box 10 along the length direction of the vehicle body structure, and the cavity 112a extends along the width direction of the vehicle body structure.

[0167] This helps reduce the risk of vehicle 1000 spontaneously combusting due to damage to battery device 100 in the event of a frontal collision or rear-end collision.

[0168] In some embodiments, the first direction is the vertical direction. The vertical direction is the straight line in which the direction of gravity lies.

[0169] In some embodiments, see Figure 11 The first direction is the height direction of the vehicle body structure at 400.

[0170] The various embodiments / implementations provided in this application can be combined with each other without creating contradictions.

[0171] The above are merely preferred embodiments of this application and are not intended to limit the embodiments in this application. For those skilled in the art, the embodiments of this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A battery device, characterized in that, The battery device includes a battery cell and a battery housing. The battery housing encloses an installation space, and the battery cell is located within the installation space. The battery housing includes a buffer section, which includes a base material and a buffer element. The base material is an integrally formed structure, and the buffer element is embedded in the base material. The buffer element has a cavity inside.

2. The battery device according to claim 1, characterized in that, The battery housing includes multiple sub-housing units, which together enclose the installation space. Each sub-housing unit includes a first housing, and the buffer portion is located in the first housing. A portion of the surface of the base material portion forms at least a portion of the inner wall of the installation space, and a portion of the surface of the base material portion forms at least a portion of the outer surface of the battery housing.

3. The battery device according to claim 2, characterized in that, The cavity is provided with a first reinforcing rib, which connects the inner walls of the cavity on both sides along the opposite direction of the buffer and the installation space. And / or, the cavity is provided with a second reinforcing rib, the second reinforcing rib connecting the inner walls of the cavity on both sides perpendicular to the direction of the buffer and the mounting space.

4. The battery device according to claim 2, characterized in that, The relative direction of the buffer component and the mounting space is perpendicular to the extension direction of the cavity, and the projected shape of the cavity is circular in the projection plane perpendicular to the extension direction of the cavity.

5. The battery device according to claim 2, characterized in that, The relative direction of the buffer and the mounting space and the extension direction of the cavity are perpendicular to each other. The cavity has a first dimension along the dimension perpendicular to the relative direction of the buffer and the mounting space, and a second dimension along the dimension of the cavity along the relative direction of the buffer and the mounting space. The first dimension is larger than the second dimension.

6. The battery device according to claim 2, characterized in that, The first housing includes a side enclosure and a plate-shaped portion. The side enclosure surrounds the peripheral edge of the plate-shaped portion. The side enclosure and the plate-shaped portion together form a mounting cavity, which forms at least a portion of the mounting space. The side enclosure is provided with the buffer portion. And / or, the plate-shaped portion is provided with the buffer portion.

7. The battery device according to claim 6, characterized in that, The buffer includes a first buffer sub-component, the cavity includes a first sub-cavity, the first sub-cavity is located inside the first buffer sub-component, the mounting cavity is open on one side along a second direction, the side enclosure is provided with the first buffer sub-component, the first buffer sub-component is located on one side of the mounting cavity along a first direction, the first direction is perpendicular to the second direction, and in the first direction, at least a portion of the projection of the first sub-cavity is located within the projection range of the mounting cavity.

8. The battery device according to claim 7, characterized in that, In the first direction, the projection of the first sub-cavity is completely within the projection range of the mounting cavity, the dimension of the first sub-cavity along the second direction is the third dimension, the dimension of the mounting cavity along the second direction is the fourth dimension, and the ratio of the third dimension to the fourth dimension is not less than 0.

8.

9. The battery device according to claim 7, characterized in that, The cavity extends along a third direction, and the first direction, the second direction, and the third direction are perpendicular to each other. In the first direction, the projection of the first sub-cavity is completely within the projection range of the mounting cavity. The dimension of the first sub-cavity along the third direction is a fifth dimension, and the dimension of the mounting cavity along the third direction is a sixth dimension. The ratio of the fifth dimension to the sixth dimension is not less than 0.

7.

10. The battery device according to claim 6, characterized in that, The buffer includes a second buffer sub-component, the cavity includes a second sub-cavity, the second sub-cavity is located inside the second buffer sub-component, the mounting cavity is open on one side along a second direction, the plate-shaped portion is provided with the second buffer sub-component, the second buffer sub-component is located on the side of the mounting cavity opposite to its open position along the second direction, and in the second direction, at least a portion of the projection of the second sub-cavity is located within the projection range of the mounting cavity.

11. The battery device according to claim 6, characterized in that, The side panel is provided with the buffer member; and / or, the plate-shaped portion is provided with the buffer member.

12. The battery device according to claim 1, characterized in that, The wall thickness of the buffer element is 0.7 mm to 1.3 mm.

13. The battery device according to claim 1, characterized in that, The distance between the outer surface of the buffer and the surface of the nearest substrate portion is not less than 1.8 mm.

14. The battery device according to claim 1, characterized in that, At least a portion of the surface of the substrate forms at least a portion of the outer surface of the battery housing.

15. The battery device according to any one of claims 1 to 14, characterized in that, The buffer is a metal structure.

16. The battery device according to any one of claims 1 to 14, characterized in that, The base material is a first metal material, the buffer material is a second metal material, the base material is a cast integral structure, and the melting point of the first metal material is lower than that of the second metal material.

17. A battery housing, characterized in that, The battery box includes a buffer section, which includes a base material and a buffer element. The base material is an integrally molded structure, and the buffer element is embedded in the base material. The buffer element has a cavity inside.

18. The battery housing according to claim 17, characterized in that, The battery housing includes multiple sub-housing units, which together enclose an installation space. Each sub-housing unit includes a first housing, and the buffer portion is located in the first housing. A portion of the surface of the base material portion forms at least a portion of the inner wall of the installation space, and a portion of the surface of the base material portion forms at least a portion of the outer surface of the battery housing.

19. The battery housing according to claim 18, characterized in that, The first housing includes a side enclosure and a plate-shaped portion. The side enclosure surrounds the peripheral edge of the plate-shaped portion. The side enclosure and the plate-shaped portion together form a mounting cavity, which forms at least a portion of the mounting space. The side enclosure is provided with the buffer portion. And / or, the plate-shaped portion is provided with the buffer portion.

20. The battery housing according to claim 19, characterized in that, The buffer includes a first buffer sub-component, the cavity includes a first sub-cavity, the first sub-cavity is located inside the first buffer sub-component, the mounting cavity is open on one side along a second direction, the side enclosure is provided with the first buffer sub-component, the first buffer sub-component is located on one side of the mounting cavity along a first direction, the first direction is perpendicular to the second direction, and in the first direction, at least a portion of the projection of the first sub-cavity is located within the projection range of the mounting cavity.

21. An electrical appliance, characterized in that, The electrical device includes the battery device according to any one of claims 1-16, the battery device being used as a power source for the electrical device.

22. The electrical appliance according to claim 21, characterized in that, The electrical device is a vehicle, the vehicle includes a body structure, the buffer is located on at least one side of the battery box along the width direction of the body structure, and the cavity extends along the length direction of the body structure. And / or, the buffer is located on at least one side of the battery box along the length of the vehicle body structure, and the cavity extends along the width of the vehicle body structure.

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