Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, the battery device comprises a battery monomer, a box body, a protective plate and a buffer structure, the box body defines a containing cavity for containing the battery monomer, the box body comprises a first wall and at least one beam body, the first wall participates in defining to form the containing cavity, and the beam body is located in the containing cavity; the protective plate is arranged on one side, deviating from the battery monomers, of the first wall; the buffer structure is arranged between the first wall and the protective plate; the buffer structure comprises a connecting plate and a buffer layer, the buffer layer is arranged on at least one side of the connecting plate in the thickness direction, the elasticity modulus of the buffer layer is lower than that of the protective plate, and the protective plate is fixedly connected with the beam body at least through the connecting plate. According to the embodiment of the invention, the battery device can improve the impact resistance of the single batteries and the box body on the side of the protective plate, and alleviate the problem of abnormal sound possibly occurring in the use process of the protective plate and the box body in the battery device.

Description

Technical Field

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

[0002] With the technological development and product iteration of new energy vehicles, the reliability of batteries, as one of the power sources, has received more attention.

[0003] Among these issues, problems such as abnormal noises and weak impact resistance of the battery, which occur during vehicle operation, urgently need to be addressed. Utility Model Content

[0004] This application provides a battery device and an electrical device that can improve the impact resistance of the battery cell and the casing on the protective plate side, and alleviate the abnormal noise problem that may occur between the protective plate and the casing during the use of the battery device.

[0005] In a first aspect, this application provides a battery device, including a battery cell, a housing, a protective plate, and a buffer structure. The housing defines a cavity for accommodating the battery cell. The housing includes a first wall and at least one beam. The first wall helps to define the cavity, and the beam is located within the cavity. The protective plate is disposed on the side of the first wall opposite to the battery cell. The buffer structure is disposed between the battery cell and the protective plate. The buffer structure includes a connecting plate and a buffer layer. The buffer layer is disposed on at least one side of the connecting plate along its thickness direction. The elastic modulus of the buffer layer is lower than that of the protective plate. The protective plate is connected and fixed to the beam at least through the connecting plate.

[0006] According to the battery device of the first aspect of this application, the battery device uses a protective plate to prevent foreign objects from directly impacting the first wall, thereby improving the impact resistance of the battery cells on the protective plate side. A buffer structure is also provided between the protective plate and the first wall. The buffer structure includes a buffer layer, which has a stronger deformation capacity than the protective plate. Therefore, when the protective plate is subjected to external impact, it can absorb impact energy through deformation, providing better protection for the housing and the battery cells inside. The buffer structure also includes a connecting plate, through which the protective plate can be connected to the beam of the housing, thereby achieving relative fixation of the protective plate, the buffer structure, and the housing. This reduces the vibration amplitude of the protective plate under bumpy conditions and reduces the impact of the protective plate and buffer structure against the first wall of the housing, thereby improving the abnormal noise problem of the battery device during vehicle operation and enhancing the user experience.

[0007] In some embodiments, the buffer layer is bonded and fixed to the connecting plate.

[0008] In the above embodiments, by bonding and fixing, a larger adhesion area can be formed between the buffer layer and the connecting plate, thereby increasing the connection strength between the buffer layer and the connecting plate, and thus improving the stability of the connection between the buffer layer and the protective plate and the first wall.

[0009] In some embodiments, the buffer layer includes a first buffer sub-layer, which is sandwiched between the protective plate and the connecting plate, and is bonded and fixed to the protective plate.

[0010] In the above embodiments, the first buffer sub-layer sandwiched between the protective plate and the connecting plate can deform first to absorb impact energy when the protective plate is impacted, thereby reducing the impact energy received by the connecting plate and providing better protection for the first wall of the enclosure. Furthermore, the adhesive bonding between the first buffer sub-layer and the protective plate can improve the stability of the connection between the protective plate and the buffer structure, reducing the probability of the buffer structure and the protective plate slapping and producing abnormal noises under bumpy conditions.

[0011] In some embodiments, the connecting plate and the beam are fixed by bolts, and the first buffer sub-layer has a first clearance area, the orthographic projection of the first clearance area on the protective plate at least covers the orthographic projection of the bolt head on the protective plate.

[0012] In the above embodiments, the bolt connection facilitates the disassembly or assembly of the buffer structure and the housing, and the first buffer sub-layer can reduce the space occupied by the bolt head in the thickness direction by opening the first avoidance area, which helps to reduce the size of the battery device and increase the energy density of the battery device.

[0013] In some embodiments, the dimension of the first buffer sublayer in the thickness direction is greater than or equal to the dimension of the bolt head in the thickness direction.

[0014] In the above embodiments, the contact between the bolt head and the protective plate is reduced to alleviate the wear that the bolt head may cause to the protective plate during the use of the battery device.

[0015] In some embodiments, the elastic modulus of the first buffer sublayer is less than or equal to 10 MPa.

[0016] In the above embodiments, the first buffer sublayer has better deformation capability under the same impact force, thereby absorbing more impact energy and reducing the transmission of impact energy to the connecting plate and the first wall.

[0017] In some embodiments, the buffer layer further includes a second buffer sublayer sandwiched between the connecting plate and the first wall.

[0018] In the above embodiments, the second buffer sub-layer sandwiched between the connecting plate and the first wall can absorb the impact energy borne by the protective plate side, further reducing the transmission of impact energy to the first wall and the battery cells it carries, thus achieving better protection.

[0019] In some embodiments, the elastic modulus of the second buffer sublayer is greater than or equal to the elastic modulus of the first buffer sublayer.

[0020] In the above embodiments, under the same impact force, the deformation degree of the second buffer sublayer is less than that of the first buffer sublayer to reduce the wear caused to the first wall by the second buffer sublayer during the deformation process.

[0021] In some embodiments, the first wall includes a flow channel region and a non-flow channel region, the flow channel region protruding in a direction away from the battery cell relative to the non-flow channel region, and the second buffer sublayer is provided with at least one protrusion, the orthographic projection of the protrusion on the protective plate falling within the orthographic projection range of the non-flow channel region on the protective plate.

[0022] In the above embodiments, the first wall can exchange heat with the battery cells through the liquid cooling channel so that the battery cells can work under more suitable temperature conditions. The protrusions of the second buffer sub-layer can be set to correspond to the non-channel area of ​​the first wall, and the recessed position relative to the protrusions can be set to correspond to the channel area of ​​the first wall. Thus, the first wall and the second buffer sub-layer can share part of the space in the thickness direction, further reducing the size of the battery device in the thickness direction and improving the energy density of the battery device.

[0023] In some embodiments, when the protrusion makes contact with the non-flow channel region of the first wall, the flow channel region of the first wall is spaced apart from the second buffer sublayer.

[0024] In the above embodiments, the protrusions of the second buffer sublayer can support the non-flow channel area of ​​the first wall, further reducing the probability of deformation of the first wall and improving the structural strength of the first wall. Furthermore, when the protrusions of the second buffer sublayer support the non-flow channel area, the second buffer sublayer does not contact the flow channel area of ​​the first wall, thereby reducing frictional losses of the buffer structure on the flow channel area and lowering the probability of heat exchange fluid leakage.

[0025] In some embodiments, multiple battery cells are stacked together, and the protrusions extend along the stacking direction of the battery cells.

[0026] In the above embodiments, the flow channel region of the first wall and the protrusion that supports the non-flow channel region of the first wall extend along the stacking direction of the battery cells, so that the first wall can exchange heat with each battery cell, and the second buffer sub-layer can support the long side of the first wall to reduce the deformation probability of the first wall and improve the structural strength of the first wall to improve the protection effect of the housing.

[0027] In some embodiments, the extension direction of at least one beam intersects the extension direction of the protrusion.

[0028] In the above embodiments, by restricting the movement of the second buffer sublayer in two intersecting directions, the connection strength between the buffer structure and the first wall is improved, so as to prevent the buffer structure from being misaligned relative to the first wall in the cross section perpendicular to the thickness direction, thereby reducing the frictional loss between the second buffer sublayer and the first wall.

[0029] In some embodiments, the elastic modulus of the second buffer sublayer is greater than or equal to 70 MPa.

[0030] In the above embodiments, the deformation of the second buffer sublayer under the same impact force is smaller, thereby enabling the second buffer sublayer to provide better support for the first wall and reducing the frictional loss between the second buffer sublayer and the first wall that may be caused by deformation.

[0031] In some embodiments, the dimension of the connecting plate in the thickness direction is less than or equal to 0.5 mm.

[0032] In the above embodiments, the connecting plate can reduce the increase in the thickness of the battery device by setting up the buffer structure while ensuring the connection strength between the beam and the protective plate.

[0033] Secondly, this application provides an electrical device configured to receive electrical energy provided by a battery device as provided in any embodiment of the first aspect. Attached Figure Description

[0034] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0035] Figure 1 This is a schematic diagram of the structure of an electrical device according to an embodiment of this application;

[0036] Figure 2 This is a schematic diagram of the structure of a battery device according to an embodiment of this application;

[0037] Figure 3 This is a schematic diagram of the structure of a battery cell assembly according to an embodiment of this application;

[0038] Figure 4 This is an exploded view of a buffer structure according to an embodiment of this application;

[0039] Figure 5 This is a schematic diagram of the buffer structure, protective plate, and first wall according to an embodiment of this application;

[0040] Figure 6 This is a schematic cross-sectional view of the connection between the buffer structure, the protective plate, and the first wall according to an embodiment of this application.

[0041] The accompanying drawings are not necessarily drawn to scale.

[0042] The specific marking information in the attached diagram is as follows:

[0043] 1000, vehicles;

[0044] 100. Battery assembly; 200. Controller; 300. Motor;

[0045] 10. Top cover; 20. Battery cell assembly; 21. Battery cell; 30. Housing; 31. Beam; 32. Protective plate; 33. First wall; 331. Flow channel area;

[0046] 40. Buffer structure; 41. First buffer sub-layer; 411. First clearance area; 42. Connecting plate; 421. Bolt; 43. Second buffer sub-layer; 431. Protrusion; 432. Second clearance area;

[0047] Thickness direction Z; Cell width direction X; Cell stacking direction Y. Detailed Implementation

[0048] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0049] 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 pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0050] In the description of the embodiments of this application, technical terms such as "first" and "second" 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.

[0051] 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.

[0052] 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 have an "or" relationship.

[0053] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0054] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0055] 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is also included between the casing and the electrode assembly 114. The sealing bag is used to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0060] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0061] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0062] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0063] In the automotive industry, batteries are commonly used for powering low-voltage electrical equipment, assisting in engine starting, and serving as backup power. In recent years, with the technological development and product iteration of new energy vehicles, batteries have been increasingly used as a power source.

[0064] Generally, the power battery is integrated into the bottom of the vehicle to meet the requirements of center of gravity design and space layout in vehicle design. The vehicle also has a bottom guard plate to prevent the power battery from scraping against the ground during vehicle operation, especially when passing over poor road conditions or speed bumps. The bottom guard plate can also prevent rain, snow, mud, sand and dust from entering the power battery, improving the safety of the power battery.

[0065] In related technologies, underbody protection plates are typically attached to the vehicle chassis or the battery pack via corner connections. However, due to the assembly gap between the underbody protection plate and the battery pack, during vehicle operation, especially under vibration caused by bumpy road conditions, the underbody protection plate is prone to intermittent impacts or friction with the battery pack, resulting in abnormal noises and negatively impacting the overall vehicle's noise, vibration, and harshness (NVH) performance.

[0066] Furthermore, underbody protection plates are mostly made of rigid materials, which can provide a more robust barrier against impacts from road debris such as flying stones during vehicle operation. However, once the underbody protection plate comes into contact with the battery pack during an impact, a large amount of impact force will be directly transmitted to the battery pack, thereby reducing the pack's ability to protect the internal batteries and even causing serious consequences such as damage to individual battery cells or failure of seals.

[0067] To address the aforementioned technical problems, this application provides a battery device and an electrical device. The battery device includes a housing, a protective plate, and a buffer structure. The housing contains individual battery cells, and the buffer structure is positioned between the housing and the protective plate. When the protective plate is impacted, the buffer structure absorbs some of the impact energy to reduce the impact on the housing. Furthermore, the protective plate is connected to the beam of the housing via a connecting plate of the buffer structure, improving the stability of the connection between the battery cells, the buffer structure, and the protective plate, thereby reducing the impact noise and frictional loss of the battery device under vibration.

[0068] It should be noted that the electrical devices provided in this application are not limited to vehicles equipped with batteries. They can also include mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0069] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0070] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and 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.

[0071] 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.

[0072] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device provided in some embodiments of this application. The battery device 100 includes a battery housing and one or more battery cell assemblies 20. In some embodiments, the battery housing may include a top cover 10 and a housing 30, with the top cover 10 and housing 30 covering each other, and the top cover 10 and housing 30 together defining a receiving cavity for accommodating the battery cell assembly 20. The housing 30 may be a hollow structure with one end open, and the top cover 10 may be a plate-like structure, with the top cover 10 covering the open side of the housing 30 so that the top cover 10 and housing 30 together define the receiving cavity; the top cover 10 and housing 30 may also be hollow structures with one side open, with the open side of the top cover 10 covering the open side of the housing 30. Of course, the battery housing formed by the top cover 10 and housing 30 can be of various shapes, such as a cylinder, a cuboid, etc.

[0073] Please refer to Figure 3 , Figure 3This is a schematic diagram of the structure of a battery cell assembly according to some embodiments of this application. The battery cell assembly 20 is used to provide voltage and capacity. The battery cell assembly 20 may include multiple battery cells 21, which are connected in series, parallel, or mixed connection via a busbar. The battery cell assembly 20 includes multiple battery cells 21, which can be connected in series, parallel, or mixed connection. Mixed connection means that some of the battery cells 21 are connected in series and others in parallel. The multiple battery cells 21 can be directly connected in series, parallel, or mixed connection, and then the entire assembly of the multiple battery cells 21 is housed in a casing. Alternatively, the battery device 100 may also consist of multiple battery cells 21 first connected in series, parallel, or mixed connection to form a battery module, and then multiple battery modules are connected in series, parallel, or mixed connection to form a whole, which is then housed in a casing. The battery device 100 may also include other structures; for example, the battery device 100 may also include a busbar for realizing the electrical connection between the multiple battery cells 21.

[0074] Each battery cell 21 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited to these. The battery cell 21 can be cylindrical, flat, cuboid, or other shapes.

[0075] Please see Figures 4 to 6 The first aspect of this application provides a battery device 100, which includes a battery cell 21, a housing 30, a protective plate 32, and a buffer structure 40. The housing 30 defines a receiving cavity for accommodating the battery cell 21. The housing 30 includes a first wall 33 and at least one beam 31. The first wall 33 participates in defining the receiving cavity, and the beam 31 is located within the receiving cavity. The protective plate 32 is disposed on the side of the first wall 33 facing away from the battery cell 21. The buffer structure 40 is disposed between the battery cell 21 and the protective plate 32.

[0076] Optionally, the first wall 33 and the protective plate 32 are arranged parallel to each other, and the first wall 33 is used to fix the battery cell 21. Exemplarily, the first wall 33 is bonded and fixed to the battery cell 21.

[0077] The beam 31 refers to the beam structure set on the side of the first wall 33 facing the battery cell 21. The beam 31 is used to improve the structural strength of the box 30 to optimize the fixing effect of the box 30 on the battery cell 21.

[0078] Optionally, the housing 30 also includes a side wall disposed on the side of the first wall 33 facing the battery cell 21, the side wall cooperating with the first wall 33 to form a receiving cavity for accommodating the battery cell 21, and the beam 31 disposed in the receiving cavity and connected to the first wall 33 or the side wall.

[0079] Alternatively, the beam 31 is used to limit the expansion deformation of the battery cell 21. In other words, the beam 31 can be used as a limiting beam for the housing 30 in the battery device 100.

[0080] Alternatively, the beam 31 can be used to provide rigid support for the first wall 33 or the side wall. In other words, the beam 31 can be used as a crossbeam or longitudinal beam of the housing 30 in the battery device 100, and can be used to separate the accommodating cavity, arrange electrical components, or arrange heat exchange pipelines, etc. This application does not make specific limitations in this regard.

[0081] The elastic modulus of the buffer structure 40 is not higher than that of the protective plate 32, so that when the battery device 100 is subjected to external impact on the protective plate 32 side, the buffer structure 40 can deform and the deformation amplitude is not less than that of the protective plate 32 to achieve collapse and absorb energy, thereby reducing the transmission of impact energy to the first wall 33, so as to form a better protection effect for the battery cell 21 inside the housing 30.

[0082] Specifically, the buffer structure 40 includes a connecting plate 42 and a buffer layer. The buffer layer is disposed on at least one side of the connecting plate 42 along the thickness direction Z. The elastic modulus of the buffer layer is lower than the elastic modulus of the guard plate 32. The guard plate 32 is connected and fixed to the beam 31 at least through the connecting plate 42.

[0083] Among them, the thickness direction Z refers to the extension direction of the smallest dimension of the guard plate 32, and the thickness direction Z is perpendicular to the large surface of the guard plate 32.

[0084] The buffer layer is provided on at least one side of the connecting plate 42 along the thickness direction Z, including: the buffer layer is provided on the side of the connecting plate 42 facing the first wall 33, or the buffer layer is provided on the side of the connecting plate 42 facing the guard plate 32, or the buffer layer is provided on both the side of the connecting plate 42 facing the guard plate 32 and the side facing the first wall 33.

[0085] The fact that the protective plate 32 is at least connected and fixed to the beam 31 via the connecting plate 42 means that the connecting plate 42 is connected and fixed to both the protective plate 32 and the beam 31. This stable connection between the protective plate 32, the connecting plate 42, and the beam 31 reduces the vibration amplitude of the protective plate 32 and the connecting plate 42 relative to the first wall 33 in the thickness direction Z under vibration excitation, thereby mitigating the problem of abnormal noise caused by the impact of the protective plate 32 and the buffer structure 40 against the first wall 33.

[0086] Optionally, the elastic modulus of the connecting plate 42 is lower than that of the protective plate 32, or the elastic modulus of the connecting plate 42 is equal to that of the protective plate 32.

[0087] According to the battery device 100 provided in the first aspect embodiment of this application, the protective plate 32 can be connected to the beam 31 of the housing 30 through the connecting plate 42, so as to achieve relative fixation of the protective plate 32, the buffer structure 40 and the housing 30, reduce the vibration amplitude of the protective plate 32 under bumpy conditions, reduce the situation of the protective plate 32 and the buffer structure 40 hitting the first wall 33, thereby improving the abnormal noise problem of the battery device 100 during the vehicle 1000 driving process and improving the user experience.

[0088] According to some embodiments of the first aspect of this application, the buffer layer is bonded and fixed to the connecting plate 42.

[0089] Optionally, the buffer layer is provided with at least two layers, wherein at least one buffer layer is bonded and fixed to the connecting plate 42.

[0090] Optionally, the buffer layer is bonded to the connecting plate 42 with adhesive backing.

[0091] Alternatively, the entire side of the buffer layer facing the connecting plate 42 is provided with adhesive backing.

[0092] Therefore, by bonding and fixing the buffer layer and the connecting plate 42, a larger adhesion area can be formed, improving the connection strength between the buffer layer and the connecting plate 42, and thus improving the stability of the connection between the buffer layer and the protective plate 32 and the first wall 33. Furthermore, the bonding and fixing method can avoid defects such as curling or warping of the buffer layer or the connecting plate 42. When the protective plate 32 side of the battery device 100 is impacted, the buffer layer can provide a uniform energy absorption effect.

[0093] According to some other embodiments of the first aspect of this application, when the connecting plate 42 is fixed to the guard plate 32 and the beam 31, the buffer layer is subjected to a compressive force to achieve relative fixation with the connecting plate 42.

[0094] According to some embodiments of the first aspect of this application, the buffer layer includes a first buffer sub-layer 41, which is sandwiched between the protective plate 32 and the connecting plate 42, and is bonded and fixed to the protective plate 32.

[0095] Optionally, the first buffer sub-layer 41 is configured to cover the entire first wall 33 to provide a more uniform energy absorption protection effect for the first wall 33 and the individual battery cells 21 above it. Specifically, in a cross-section perpendicular to the thickness direction Z, the orthographic projection of the first buffer sub-layer 41 covers the orthographic projection of the first wall 33.

[0096] Alternatively, on a cross section perpendicular to the thickness direction Z, the orthographic projection range of the first buffer sublayer 41 coincides with the orthographic projection range of the protective plate 32.

[0097] Optionally, the first buffer sublayer 41 covers a portion of the first wall 33 to provide local energy absorption protection for the housing 30 and the battery cells 21 or other components therein.

[0098] Therefore, the first buffer sub-layer 41 sandwiched between the protective plate 32 and the connecting plate 42 can deform before the connecting plate 42 when the protective plate 32 is impacted, absorbing the impact energy, thereby reducing the probability of deformation of the connecting plate 42 and providing better protection for the first wall 33 and the battery cell 21 above it. Furthermore, the adhesive bonding between the first buffer sub-layer 41 and the protective plate 32 can improve the stability of the connection between the protective plate 32 and the buffer structure 40, reducing the probability of the buffer structure 40 and the protective plate 32 colliding and producing abnormal noises under bumpy conditions.

[0099] According to some embodiments of the first aspect of this application, the connecting plate 42 and the beam 31 are connected and fixed by bolts 421, and the first buffer sub-layer 41 is provided with a first avoidance area 411. The orthographic projection of the first avoidance area 411 on the guard plate 32 at least covers the orthographic projection of the head of the bolt 421 on the guard plate 32.

[0100] Optionally, multiple bolts 421 are provided at intervals along the extension direction of the beam 31.

[0101] Alternatively, the first clearance area 411 includes a plurality of clearance holes, which are provided in a one-to-one correspondence with the bolts 421.

[0102] Alternatively, the first avoidance zone 411 is opened along the extension direction of the beam 31 to avoid the entire beam 31.

[0103] Therefore, the bolt 421 connection facilitates the disassembly or assembly of the buffer structure 40 and the housing 30, and the first buffer sub-layer 41 can reduce the space occupied by the head of the bolt 421 in the thickness direction Z by opening the first avoidance area 411, which helps to reduce the size of the battery device 100 and increase the energy density of the battery device 100.

[0104] According to some embodiments of the first aspect of this application, the dimension of the first buffer sublayer 41 in the thickness direction Z is greater than or equal to the dimension of the head of the bolt 421 in the thickness direction Z.

[0105] Optionally, the thickness of the first buffer sublayer 41 is greater than the thickness of the head of the bolt 421.

[0106] Alternatively, the minimum thickness of the first buffer sublayer 41 after impact compression is greater than or equal to the thickness of the head of the bolt 421, so as to prevent the head of the bolt 421 from causing frictional wear on the guard plate 32.

[0107] This reduces the contact between the head of bolt 421 and the protective plate 32, thereby mitigating the wear that the head of bolt 421 may cause to the protective plate 32 during the use of the battery device 100.

[0108] According to some embodiments of the first aspect of this application, the elastic modulus of the first buffer sublayer 41 is less than or equal to 10 MPa.

[0109] Optionally, the elastic modulus of the first buffer sublayer 41 is selected from one of 0.5MPa, 1MPa, 1.5MPa, 2MPa, 2.5MPa, 3MPa, 3.5MPa, 4MPa, 4.5MPa, 5MPa, 5.5MPa, 6MPa, 6.5MPa, 7MPa, 7.5MPa, 8MPa, 8.5MPa, 9MPa, 9.5MPa, and 10MPa.

[0110] Optionally, the material of the first buffer sublayer 41 is selected from polyurethane foam, foamed polyethylene, or polypropylene plastic foam.

[0111] Optionally, the first buffer sublayer 41 has a dimension in the thickness direction Z that is greater than or equal to 5 mm and less than or equal to 15 mm.

[0112] Further optionally, the thickness of the first buffer sublayer 41 is selected from one of 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, and 15mm.

[0113] Understandably, the thickness and elastic modulus of the first buffer sublayer 41 can be adjusted adaptively according to the different actual design requirements of the battery device 100.

[0114] Therefore, the first buffer sublayer 41 has a better deformation capacity under the same impact force, thus absorbing more impact energy and reducing the transmission of impact energy to the connecting plate 42 and the first wall 33.

[0115] According to some embodiments of the first aspect of this application, the buffer layer further includes a second buffer sub-layer 43, which is sandwiched between the connecting plate 42 and the battery cell 21.

[0116] Optionally, the second buffer sub-layer 43 is provided as a whole layer. Specifically, the orthographic projection of the second buffer sub-layer 43 on the protective plate 32 at least covers the orthographic projection of the first wall 33 on the protective plate 32.

[0117] Optionally, the second buffer sublayer 43 is partially provided. Specifically, the dimension of the second buffer sublayer 43 in at least one of the thickness direction Y and the width direction X of the battery cell 21 is smaller than that of the first wall 33.

[0118] Optionally, when the connecting plate 42 is connected to the beam 31, the second buffer sub-layer 43 is fixed relative to the connecting plate 42 under the action of clamping force.

[0119] Optionally, the second buffer sublayer 43 has a second avoidance area 432, which is used to avoid at least one of the bolt 421 and the beam 31.

[0120] Optionally, the second buffer sublayer 43 is bonded and fixed to the connecting plate 42.

[0121] Therefore, the addition of a second buffer sub-layer 43 can increase the second collapse and energy absorption process on the path of the impact force transmitted from the protective plate 32 to the first wall 33, realize the secondary release of impact energy, further reduce the impact energy received by the first wall 33 and the probability of its deformation, and form a better protection effect for the battery cell 21 above the first wall 33.

[0122] According to some embodiments of the first aspect of this application, the elastic modulus of the second buffer sublayer 43 is greater than or equal to the elastic modulus of the first buffer sublayer 41.

[0123] It is understandable that the elastic modulus of the second buffer sublayer 43 is less than that of the protective plate 32.

[0124] Optionally, the elastic modulus of the second buffer sublayer 43 is less than that of the elastic modulus of the connecting plate 42.

[0125] Therefore, the addition of a second buffer sub-layer 43 can further absorb the energy transmitted from the connecting plate 42 to the first wall 33. Furthermore, under the same impact force, the deformation degree of the second buffer sub-layer 43 is less than that of the first buffer sub-layer 41, thereby reducing the wear caused to the battery cell 21 by the second buffer sub-layer 43 during deformation.

[0126] Therefore, the heat exchange component 50 is conveniently located on the side of the guard plate 32 for maintenance. Furthermore, the heat exchange component 50 is relatively fixed to the buffer structure 40 and the guard plate 32 via the beam 31, thereby reducing potential impact noises between the heat exchange component 50 and the buffer structure 40.

[0127] According to some embodiments of the first aspect of this application, the first wall 33 includes a flow channel region 331 and a non-flow channel region. The flow channel region 331 protrudes in a direction away from the battery cell 21 relative to the non-flow channel region. The second buffer sub-layer 43 is provided with at least one protrusion 431. The orthogonal projection of the protrusion 431 on the protective plate 32 falls within the orthogonal projection range of the non-flow channel region on the protective plate 32.

[0128] Optionally, the first wall 33 contacts the battery cell 21 for heat exchange, or the first wall 33 exchanges heat with other components within the battery device 100 to enable the battery cell 21 to operate under suitable temperature conditions.

[0129] Optionally, the first wall 33 is disposed on the side of the battery cell 21 away from the electrode terminals.

[0130] Optionally, the second buffer sub-layer 43 is provided as a whole. Specifically, the second buffer sub-layer 43 also includes a recess, and the orthographic projection of the flow channel region 331 on the guard plate 32 falls within the orthographic projection range of the recess on the guard plate 32.

[0131] Optionally, the second buffer sublayer 43 includes only a plurality of protrusions 431 spaced apart, which are used to support the non-flow channel area of ​​the first wall 33.

[0132] Optionally, the protrusions 431 are continuously provided along the extension direction of the flow channel region 331, or multiple protrusions 431 are provided at intervals.

[0133] Optionally, the size of the protrusion 431 is the same as that of the non-flow channel region along the direction perpendicular to the flow channel region 331, so as to improve the support effect of the second buffer sub-layer 43 on the first wall 33.

[0134] Optionally, along the direction perpendicular to the flow channel region 331, the size of the protrusion 431 is the same as the size of the non-flow channel region, so as to facilitate the alignment of the protrusion 431 with the non-flow channel region when the second buffer sub-layer 43 is assembled to the first wall 33.

[0135] Therefore, the first wall 33 can conduct or replenish the heat generated by the battery cell 21 during charging and discharging through the liquid cooling channel, so that the battery cell 21 can operate under suitable temperature conditions. The protrusion 431 of the second buffer sub-layer 43 can be arranged corresponding to the non-channel area of ​​the first wall 33, and the concave position relative to the protrusion 431 can be arranged corresponding to the channel area 331 of the first wall 33. Thus, the first wall 33 and the second buffer sub-layer 43 can share part of the space in the thickness direction Z, further reducing the size of the battery device 100 in the thickness direction Z and increasing the energy density of the battery device 100.

[0136] According to some embodiments of the first aspect of this application, when the protrusion 431 makes contact with the non-flow channel area of ​​the first wall 33, the flow channel area 331 of the first wall 33 is spaced apart from the second buffer sub-layer 43.

[0137] When the protrusion 431 comes into contact with the non-flow channel area of ​​the first wall 33, the protrusion 431 can support the non-flow channel area, thereby achieving relative fixation between the first wall 33 and the second buffer sub-layer 43. At this time, the second buffer sub-layer 43 is spaced apart from the flow channel area 331 and does not come into contact, so as to reduce the frictional loss that the deformation or displacement of the second buffer sub-layer 43 may cause to the flow channel area 331 during the use of the battery device 100, thereby reducing the probability of liquid leakage from the first wall 33.

[0138] Optionally, the protrusion 431 is provided in a one-to-one correspondence with the non-flow channel area of ​​the first wall 33.

[0139] Optionally, the number of protrusions 431 is less than the number of non-flow channel areas of the first wall 33. The protrusions 431 provide support for some of the non-flow channel areas to form local structural reinforcement, thereby reducing the probability of deformation in the weak areas of the first wall 33.

[0140] Therefore, the protrusions 431 of the second buffer sub-layer 43 can support the non-flow channel area of ​​the first wall 33, reducing the probability of deformation of the first wall 33 and improving the connection strength of the first wall 33. Furthermore, when the protrusions 431 of the second buffer sub-layer 43 support the non-flow channel area, the second buffer sub-layer 43 does not contact the flow channel area 331 of the first wall 33, thereby reducing frictional loss of the buffer structure 40 on the flow channel area 331 and reducing the probability of heat exchange fluid leakage.

[0141] According to some embodiments of the first aspect of this application, multiple battery cells 21 are stacked, and protrusions 431 extend along the stacking direction Y of the battery cells 21.

[0142] The flow channel region 331 extends along the stacking direction Y of the battery cell 21 to achieve heat exchange with multiple battery cells 21 in a battery cell assembly 20. The non-flow channel region defined by the flow channel region 331 extends in the same direction as the flow channel region 331, and the protrusion 431 extends in the same direction as the non-flow channel region.

[0143] Optionally, the first wall 33 also includes a flow collection area, the extension direction of which intersects the extension direction of the flow channel area 331, and at least a portion of the protrusion 431 intersects the extension direction of the flow collection area.

[0144] Alternatively, the extension direction of the flow collection area is perpendicular to the extension direction of the flow channel area 331.

[0145] Therefore, the flow channel region 331 of the first wall 33 and the protrusion 431 that supports the non-flow channel region of the first wall 33 extend along the stacking direction Y of the battery cell 21, so that the first wall 33 can exchange heat with each battery cell 21, and the second buffer sub-layer 43 can support the long side of the first wall 33 to reduce the deformation probability of the first wall 33 and improve the structural strength of the first wall 33.

[0146] According to some embodiments of the first aspect of this application, the extension direction of at least one beam 31 intersects the extension direction of the protrusion 431.

[0147] Optionally, the extension direction of at least one beam 31 is perpendicular to the extension direction of the protrusion 431.

[0148] In one embodiment, the beam 31 extends along the width direction X of the battery cell 21, and the protrusion 431 extends along the stacking direction Y of the battery cell 21.

[0149] It is understood that the locking of the beam 31 and the connecting plate 42 can restrict their movement in a direction perpendicular to the extension direction of the beam 31, and the fitting structure of the protrusion 431 and the flow channel area 331 can restrict their movement in a direction perpendicular to the extension direction of the protrusion 431. When the extension direction of the protrusion 431 intersects with the extension direction of the beam 31, the two movement-restricting directions of the buffer structure 40 also intersect.

[0150] Therefore, by restricting the movement of the second buffer sub-layer 43 in two intersecting directions, the connection strength between the buffer structure 40 and the first wall 33 is improved, so as to prevent the buffer structure 40 from being misaligned relative to the first wall 33 in the cross section perpendicular to the thickness direction Z, thereby reducing the frictional loss between the second buffer sub-layer 43 and the first wall 33.

[0151] According to some embodiments of the first aspect of this application, the elastic modulus of the second buffer sublayer 43 is greater than or equal to 70 MPa.

[0152] Optionally, the elastic modulus of the second buffer sublayer 43 is selected from one of 70MPa, 75MPa, 80MPa, 85MPa, 90MPa, 95MPa, and 100MPa.

[0153] Optionally, the material of the second buffer sublayer 43 includes at least one of hard rubber and polyurethane.

[0154] Therefore, the second buffer sub-layer 43 undergoes less deformation under the same impact force, thereby enabling the second buffer sub-layer 43 to provide better support for the first wall 33 and reducing the frictional loss between the second buffer sub-layer 43 and the first wall 33 that may be caused by deformation.

[0155] According to some embodiments of the first aspect of this application, the dimension of the connecting plate 42 in the thickness direction Z is less than or equal to 0.5 mm.

[0156] Optionally, the connecting plate 42 may be made of lightweight, high-strength composite material or engineering plastic. For example, the connecting plate 42 may be made of glass fiber reinforced nylon or polypropylene sheet.

[0157] Optionally, the dimension of the connecting plate 42 in the thickness direction Z is selected from one of 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, and 0.5mm.

[0158] Therefore, the connecting plate 42 can reduce the increase in the thickness direction Z of the battery device 100 by setting the buffer structure 40 while ensuring the connection strength between the beam 31 and the guard plate 32.

[0159] Secondly, embodiments of this application provide an electrical device configured to receive electrical energy provided by a battery device 100 as provided in any embodiment of the first aspect.

[0160] It is understood that, since the battery device 100 provided in any of the aforementioned first aspects is adopted, the power-consuming device provided in this application embodiment has all the beneficial effects of the battery device 100 in any of the aforementioned embodiments. For details, please refer to the foregoing description of the beneficial effects of the battery device 100. This application embodiment will not repeat the description.

[0161] For ease of understanding, the following is combined with Figures 4 to 6 A specific embodiment of this application will be described.

[0162] Please refer to the figure. This application embodiment provides a battery device 100. The battery device 100 includes a battery cell 21, a housing 30, a protective plate 32, and a buffer structure 40. The housing 30 includes a first wall 33 and a beam 31. The first wall 33 and the beam 31 together define an accommodating cavity. The battery cell 21 is fixed in the accommodating cavity. The buffer structure 40 and the protective plate 32 are sequentially disposed on the side of the first wall 33 away from the battery cell 21, and the protective plate 32 is connected to the beam 31 of the housing 30 through the buffer structure 40.

[0163] The buffer structure 40 includes a first buffer sub-layer 41, a connecting plate 42, and a second buffer sub-layer 43 stacked together. Both the first buffer sub-layer 41 and the second buffer sub-layer 43 are bonded and fixed to the connecting plate 42. The first buffer sub-layer 41 is bonded and fixed to the protective plate 32, and the elastic modulus of the first buffer sub-layer 41 is lower than that of the second buffer sub-layer 43 and the connecting plate 42. When the protective plate 32 is impacted, the first buffer sub-layer 41 can deform first to reduce the transmission of impact energy to the connecting plate 42 and the second buffer sub-layer 43.

[0164] The first wall 33 includes a flow channel region 331 and a non-flow channel region. The first wall 33 can supplement or dissipate heat to the battery cell 21 through the liquid cooling flow channel. The second buffer sub-layer 43 is sandwiched between the first wall 33 and the connecting plate 42. The second buffer sub-layer 43 can provide local support for the first wall 33 to reduce the probability of damage to the first wall 33 under impact. Specifically, the second buffer sub-layer 43 includes a protrusion 431, which can contact the non-flow channel region to improve the connection stability of the first wall 33 and the flatness of the non-flow channel region. When the protrusion 431 supports the non-flow channel region, the flow channel region 331 of the first wall 33 does not contact the second buffer sub-layer 43 to avoid wear caused by the second buffer sub-layer 43 on the flow channel region 331.

[0165] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Battery cell; A housing that defines a receiving cavity for accommodating the battery cell, the housing including a first wall and at least one beam, the first wall participating in defining the receiving cavity, the beam being located within the receiving cavity; A protective plate is disposed on the side of the first wall opposite to the battery cell; A buffer structure is disposed between the first wall and the protective plate; The buffer structure includes a connecting plate and a buffer layer. The buffer layer is disposed on at least one side of the connecting plate along the thickness direction. The elastic modulus of the buffer layer is lower than that of the protective plate. The protective plate is connected and fixed to the beam body at least through the connecting plate.

2. The battery device according to claim 1, characterized in that, The buffer layer is bonded and fixed to the connecting plate.

3. The battery device according to claim 2, characterized in that, The buffer layer includes a first buffer sub-layer, which is sandwiched between the protective plate and the connecting plate, and is bonded and fixed to the protective plate.

4. The battery device according to claim 3, characterized in that, The connecting plate is fixed to the beam by bolts. The first buffer sub-layer has a first clearance area. The orthographic projection of the first clearance area on the protective plate at least covers the orthographic projection of the bolt head on the protective plate.

5. The battery device according to claim 4, characterized in that, The first buffer sublayer has a thickness dimension greater than or equal to the thickness dimension of the bolt head.

6. The battery device according to claim 3, characterized in that, The elastic modulus of the first buffer sublayer is less than or equal to 10 MPa.

7. The battery device according to claim 3, characterized in that, The buffer layer further includes a second buffer sub-layer, which is sandwiched between the connecting plate and the first wall.

8. The battery device according to claim 7, characterized in that, The elastic modulus of the second buffer sublayer is greater than or equal to the elastic modulus of the first buffer sublayer.

9. The battery device according to claim 8, characterized in that, The first wall includes a flow channel region and a non-flow channel region. The flow channel region protrudes in a direction away from the battery cell relative to the non-flow channel region. The second buffer sub-layer is provided with at least one protrusion. The orthographic projection of the protrusion on the protective plate falls within the orthographic projection range of the non-flow channel region on the protective plate.

10. The battery device according to claim 9, characterized in that, When the protrusion comes into contact with the non-flow channel area of ​​the first wall, the flow channel area of ​​the first wall is separated from the second buffer sublayer.

11. The battery device according to claim 9, characterized in that, The battery cells are stacked in multiple layers, and the protrusions extend along the stacking direction of the battery cells.

12. The battery device according to claim 11, characterized in that, At least one of the beams extends in a direction that intersects with the extension direction of the protrusion.

13. The battery device according to claim 8, characterized in that, The elastic modulus of the second buffer sublayer is greater than or equal to 70 MPa.

14. The battery device according to claim 1, characterized in that, The dimension of the connecting plate in the thickness direction is less than or equal to 0.5 mm.

15. An electrical appliance, characterized in that, The electrical device is configured to receive electrical energy provided by the battery device as described in any one of claims 1 to 14.

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