Battery device and electric appliance

Abstract

This application discloses a battery device and an electrical appliance. The battery device includes: a housing with a receiving space and a bottom plate; multiple battery cells housed in the receiving space, with multiple electrode terminals disposed on a first wall of each battery cell; the bottom plate is located on the side of the battery cells near the bottom along the direction of gravity, with the first walls facing the bottom plate; wherein the bottom plate has multiple protrusions facing outward from the receiving space, and the protrusions are respectively located in areas of the bottom plate opposite to the multiple electrode terminals. The battery device and electrical appliance of this application can improve the reliability of the battery device.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In battery technology, the structural and mechanical properties of battery devices are crucial, directly affecting their reliability and lifespan. Therefore, improving battery device performance is a pressing technical challenge. Utility Model Content

[0004] This application provides a battery device and an electrical appliance that can improve the reliability of the battery device.

[0005] In a first aspect, this application provides a battery device, comprising: a housing and a plurality of battery cells, wherein the housing forms a receiving space and has a bottom plate; the plurality of battery cells are received in the receiving space, and a plurality of electrode terminals are disposed on a first wall of the plurality of battery cells; the bottom plate is located on the side of the plurality of battery cells near the bottom along the direction of gravity, and the first wall is disposed toward the bottom plate; wherein the bottom plate is provided with a plurality of protrusions facing the outside of the receiving space, and the plurality of protrusions are respectively located in the area of ​​the bottom plate opposite to the plurality of electrode terminals.

[0006] In the technical solution of this application embodiment, on the one hand, the base plate is provided with multiple protrusions, which can enhance the local rigidity of the base plate, making the area where the protrusions are located less prone to deformation under external impact or collision, thereby improving the impact resistance of the base plate. On the other hand, the multiple protrusions are respectively arranged in the areas where multiple electrode terminals face the base plate, thereby protecting the multiple electrode terminals, reducing the risk of the electrode terminals being damaged by external impact, and improving the reliability of the battery device.

[0007] In some embodiments of the first aspect, along the thickness direction of the base plate, the orthographic projection of the electrode terminal on the base plate is located within the region of the orthographic projection of the protrusion on the base plate.

[0008] In the technical solution of this application embodiment, the orthographic projection of the protrusion on the base plate covers the area of ​​the orthographic projection of the corresponding electrode terminal on the base plate, so that the protrusion can cover the area around the electrode terminal. In the event of an external impact on the base plate, any area of ​​the electrode terminal can be protected, further reducing the risk of the electrode terminal being damaged by external impact.

[0009] In some embodiments of the first aspect, the surface of the protrusion away from the base plate is curved.

[0010] In the technical solution of this application embodiment, the surface of the protrusion away from the base plate is designed as a curved surface, so that when the protrusion is hit by an external ball, the curved surface can decompose the impact force into forces in different directions, thereby reducing the risk of deformation caused by local impact on the protrusion and improving the protrusion's ability to protect the electrode terminals.

[0011] In some embodiments of the first aspect, the surface of the protrusion away from the base plate is a hemispherical surface.

[0012] In the technical solution of this application embodiment, the surface of the protrusion away from the base plate is designed as a hemispherical surface, which can evenly disperse the pressure generated by external impact, reduce local stress concentration, reduce the risk of base plate deformation, and when the protrusion is hit by an external ball, the spherical surface has a certain curvature, so that any position of the protrusion can decompose the impact force into forces in different directions, thereby guiding the impacting stone or other impacting object to deflect to other areas of the base plate, thereby transferring the impact force to the area corresponding to the electrode terminal in the base plate, further reducing the risk of the electrode terminal being damaged by external impact, and improving the reliability of the battery device.

[0013] In some embodiments of the first aspect, the height H of the protrusion extending beyond the base plate along the thickness direction of the base plate is in the range of 5mm ≤ H ≤ 6mm.

[0014] In the technical solution of this application embodiment, setting the protrusion to extend beyond the base plate by a height greater than or equal to 5mm along the thickness direction of the base plate can improve the local rigidity of the base plate, making the area where the protrusion is located less prone to deformation under external impact or collision, reducing the risk of electrode terminals being damaged by external impact, and improving the reliability of the battery device; setting the protrusion to extend beyond the base plate by a height less than or equal to 6mm along the thickness direction of the base plate can reduce the space occupied by the protrusion and improve the overall space utilization of the battery device.

[0015] In some embodiments of the first aspect, a buffer is provided between the battery cell and the base plate.

[0016] In the technical solution of this application embodiment, by setting a buffer between the base plate and the battery cell, when the base plate is impacted, the buffer can be squeezed to form a support between the base plate and the battery cell. The buffer absorbs part of the impact force, reducing the risk of the battery cell being damaged by external impact, thereby improving the reliability of the battery device.

[0017] In some embodiments of the first aspect, a pressure relief mechanism is also provided on the first wall, the buffer is attached to the side of the base plate near the battery cell, and there is a gap between the buffer and the pressure relief mechanism.

[0018] In the technical solution of this application embodiment, by setting the pressure relief mechanism on the first wall so that the pressure relief mechanism faces the base plate, it is possible to prevent high-temperature and high-pressure gas or ejected materials from directly impacting adjacent battery cells, circuits, or other structures, thereby reducing the risk of heat spread. A gap exists between the buffer and the pressure relief mechanism, allowing the emissions from the pressure relief mechanism to flow and exit quickly, reducing the risk of battery cell failure and improving the reliability of the battery device. Furthermore, the buffer is adhered to the base plate, allowing it to be installed along with the base plate, thus simplifying the installation method of the battery device and improving installation efficiency.

[0019] In some embodiments of the first aspect, the battery device further includes a plurality of support members spaced apart along a first direction and a plurality of battery cell assemblies arranged along the first direction, the battery cell assembly including a plurality of battery cells arranged along a second direction; the plurality of support members extend along the second direction, the first walls of the battery cells of two adjacent battery cell assemblies along the first direction abut against the same support member, the buffer member extends along the second direction and is disposed on both sides of the support member along the first direction, along the thickness direction of the base plate, the orthographic projection of the electrode terminal on the base plate is located in the area of ​​the orthographic projection of the buffer member on the base plate; the second direction is perpendicular to the first direction.

[0020] In the technical solution of this application embodiment, by setting a support member, on the one hand, when the base plate is impacted, the support member can be squeezed to form a support between the base plate and the battery cell, and the support member can maintain a certain gap between the base plate and the battery cell, so that the gap space can absorb part of the deformation caused by the impact, reduce the risk of the battery cell being damaged by external impact, and improve the reliability of the battery device; on the other hand, the support member can better support the battery cell and improve the stability of the battery device. In addition, by setting buffer members on both sides of the support member along the first direction, when the base plate is impacted by external force, the buffer members can absorb part of the impact force, and the protrusions can transmit part of the impact force to the area where the support member is located. By squeezing the buffer members and the support member, both the buffer members and the support member can form a support between the battery cell and the base plate, thereby improving the protective performance of the protrusions against the electrode terminals.

[0021] In some embodiments of the first aspect, the housing further includes a frame and a cover, wherein the frame has a first opening and a second opening on both sides along a third direction, the first opening and the second opening being interconnected; the cover is connected to the frame and closes the first opening; the base plate is connected to the frame and closes the second opening, the frame, the cover and the base plate together define the receiving space, and the support member is connected to the frame at both ends along the second direction; the third direction is perpendicular to the first direction and the second direction.

[0022] In the technical solution of this application embodiment, on the one hand, the openings on both sides of the frame are connected to the cover and the bottom plate respectively. Compared with an integrated box structure, this facilitates the replacement of the cover and the bottom plate without the need for additional protective plates to resist external ball impacts, simplifying the structure of the battery device and improving the overall lightweighting of the battery device. On the other hand, the connection between the support member and the frame improves the stability of the support member, and the expansion force of the battery cell can be transferred to the frame through the support member. The frame resists part of the expansion force, thereby improving the overall anti-expansion performance of the battery device.

[0023] In some embodiments of the first aspect, the base plate is disposed on the side of the frame away from the cover and is spaced apart from the support.

[0024] In the technical solution of this application embodiment, the base plate is set on the side of the frame away from the cover and is spaced apart from the support member, so that the battery cell can be supported by the support member or the frame, thereby reducing the load on the battery cell by the base plate, reducing the wear on the base plate, and thus improving the performance of the battery device.

[0025] In some embodiments of the first aspect, the buffer is provided within the gap between the support and the base plate.

[0026] In the technical solution of this application embodiment, a buffer is provided in the gap between the base plate and the battery cell. When the battery device is subjected to external impacts or other problems, the buffer can absorb the impact force, so that the support is subjected to less compression, thereby further protecting the battery cell, reducing the risk of damage to the battery cell, and thus improving the reliability of the battery device.

[0027] In some embodiments of the first aspect, the support has internal channels for a heat exchange medium to pass through, the heat exchange medium being used to regulate the temperature of the battery cell.

[0028] In the technical solution of this application embodiment, the support member has internal flow channels, which can restrict the movement of battery cells while regulating their temperature. When the battery cell temperature is too high or too low, it dissipates heat or cools the battery cell, reducing the risk of battery cell failure and thus improving the overall performance of the battery device. Furthermore, the internal flow channels of the support member, meaning the support member has a hollow structure, make it tensile-resistant and able to unload the expansion force of the battery cell along its length, reducing the risk of battery cell failure due to compression caused by expansion. In addition, integrating the temperature regulation function into the support member saves space for a separate temperature regulation system, making the battery device more compact and improving its performance.

[0029] In some embodiments of the first aspect, the thickness T of the base plate is in the range of 0.8 mm ≤ T ≤ 1 mm.

[0030] In the technical solution of this application embodiment, setting the thickness of the base plate to be greater than or equal to 0.8 mm can improve the strength of the base plate, thereby improving the base plate's ability to resist external ball impacts and reducing the risk of damage to individual battery cells; setting the thickness of the base plate to be less than or equal to 1 mm, while ensuring sufficient strength of the base plate, can further reduce the weight of the base plate and improve the lightweighting of the battery device.

[0031] In some embodiments of the first aspect, the side of the base plate away from the cover is coated with a protective layer.

[0032] In the technical solution of this application embodiment, by coating the outer side of the base plate with a protective layer, it can play a role in corrosion prevention and also play a role in buffering when hit by external balls, thereby improving the protective performance of the base plate.

[0033] In a second aspect, an electrical device is provided, including a battery device as described in the first aspect or any embodiment thereof, the battery device being used to provide electrical energy. Attached Figure Description

[0034] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of this application is shown;

[0035] Figure 2 A partial structural schematic diagram of a battery device according to an embodiment of this application is shown;

[0036] Figure 3 A top view of a battery device according to an embodiment of this application is shown;

[0037] Figure 4 A cross-sectional view of a battery device according to an embodiment of this application is shown;

[0038] Figure 5 A partial enlarged view of a battery device according to an embodiment of this application is shown;

[0039] Figure 6 A cross-sectional schematic diagram of the protrusion according to one embodiment of this application is shown;

[0040] Figure 7 A cross-sectional schematic diagram of the protrusion according to another embodiment of this application is shown;

[0041] Figure 8 A cross-sectional schematic diagram of the protrusion according to another embodiment of this application is shown;

[0042] Figure 9 A partial structural schematic diagram of a battery device according to another embodiment of this application is shown;

[0043] Figure 10A partial structural schematic diagram of a battery device according to another embodiment of this application is shown;

[0044] Figure 11 A cross-sectional view of a battery device according to another embodiment of this application is shown;

[0045] Figure 12 A partially enlarged view of a battery device according to another embodiment of this application is shown;

[0046] Figure 13 A bottom view of a battery device according to an embodiment of this application is shown;

[0047] Figure 14 A partial structural schematic diagram of a battery device according to another embodiment of this application is shown;

[0048] Figure 15 A cross-sectional view of a battery device according to another embodiment of this application is shown.

[0049] The accompanying drawings are not drawn to scale.

[0050] The labels for each figure are as follows:

[0051] 1-Vehicle; 10-Battery unit; 30-Controller; 40-Motor; 15-Frame; 1501-First opening; 1502-Second opening; 16-Cover; 11-Base plate; 111-Protrusion; 12-Buffer; 13-Support; 14-Battery cell assembly; 20-Battery cell; 21-Electrode terminal; 22-Pressure relief mechanism; 201-First wall. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0053] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0054] In this application, the reference to "embodiment" means that a specific 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0055] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0056] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0057] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0058] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0059] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0060] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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 included between the casing and the electrode assembly 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0069] 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.

[0070] In some embodiments, the battery device may be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within a cover.

[0071] In some embodiments, the housing in this application can be part of the vehicle's chassis structure. For example, a portion of the housing can be at least a part of the vehicle's floor, or a portion of the housing can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0072] With increasing environmental pollution, the new energy industry is attracting more and more attention. Battery technology is a crucial factor in the development of the new energy industry, especially the reliability of power batteries, which directly affects the promotion and popularization of key applications such as electric vehicles and energy storage systems. The base plate of the battery pack is a critical protective structure ensuring the safety of the internal battery cells. Its design must effectively resist external mechanical impacts, especially localized instantaneous impacts such as bottom ball strikes. While traditional designs emphasize overall rigidity, they suffer from stress concentration and insufficient protection when dealing with such concentrated loads. Therefore, how to rationally design the structure of the battery pack to improve its overall reliability is a pressing technical problem that needs to be solved.

[0073] This application provides a battery device and an electrical appliance that can solve the above-mentioned problems. The battery device of this application includes a housing and multiple battery cells. Specifically, the housing forms a receiving space and has a bottom plate; multiple battery cells are received in the receiving space, and multiple electrode terminals are disposed on the first wall of the multiple battery cells; the bottom plate is located on the side of the multiple battery cells near the bottom along the direction of gravity, and the first wall faces the bottom plate; wherein, the bottom plate has multiple protrusions facing outwards from the receiving space, and the multiple protrusions are respectively located in the area of ​​the bottom plate opposite to the multiple electrode terminals.

[0074] In this embodiment, on the one hand, the base plate is provided with multiple protrusions, which can enhance the local rigidity of the base plate, making the area where the protrusions are located less prone to deformation under external impact or collision, thereby improving the impact resistance of the base plate. On the other hand, the multiple protrusions are respectively arranged in the areas where multiple electrode terminals face the base plate, thereby protecting the multiple electrode terminals, reducing the risk of the electrode terminals being damaged by external impact, and improving the reliability of the battery device.

[0075] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0076] Electrical equipment can include vehicles, 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 equipment.

[0077] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0078] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 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 motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0079] Figure 2 A partial structural schematic diagram of the battery device 10 according to an embodiment of this application is shown; Figure 3 A top view schematic diagram of the battery device 10 according to an embodiment of this application is shown, for example, Figure 3 As shown Figure 2 A schematic diagram of the battery device 10 after assembly along the Z direction; Figure 4 A cross-sectional view of the battery device 10 according to an embodiment of this application is shown, for example, Figure 4 As shown Figure 3 A schematic cross-sectional view of the battery device 10 shown along section line A-A'.

[0080] like Figures 2 to 4As shown, the battery device 10 of this application embodiment may include a housing and a plurality of battery cells 20. Specifically, the housing forms a receiving space and has a bottom plate 11. The plurality of battery cells 20 are received in the receiving space. A plurality of electrode terminals 21 are provided on the first wall 201 of the plurality of battery cells 20. The bottom plate 11 is located on the side of the plurality of battery cells 20 near the bottom along the direction of gravity, and the first wall 201 is disposed toward the bottom plate 11. The bottom plate 11 is provided with a plurality of protrusions 111 facing the outside of the receiving space. The plurality of protrusions 111 are respectively located in the area of ​​the bottom plate 11 opposite to the plurality of electrode terminals 21.

[0081] The battery device 10 of this application embodiment may include a housing, which can be any structure with a receiving space, so that the battery cells 20 can be housed inside the housing. For example, the interior of the housing may be a hollow structure, and multiple battery cells 20 may be housed inside the housing. The housing may be a single integral piece, or it may be composed of multiple separate structures joined together.

[0082] For example, in some embodiments, the housing may include two parts, namely a first housing part and a second housing part, which are fastened together. The shapes of the first housing part and the second housing part may be determined according to the shape of the components housed inside, for example, according to the shape of a combination of multiple battery cells 20 housed inside, and at least one of the first housing part and the second housing part has an opening.

[0083] For example, in some embodiments, the housing may include three or more parts, such as a cover, a frame, and a bottom. The frame has two openings that are disposed opposite each other, and the cover and the bottom cover the two openings respectively. Multiple battery cells 20 are accommodated in the cover, frame, and bottom within the accommodating space formed by the cover and the bottom.

[0084] The battery device 10 of this application embodiment may include a plurality of battery cells 20 to meet different power usage requirements. The shape of the battery cell 20 in this application embodiment can be set according to actual application. For example, the battery cell 20 can be as follows: Figure 2 The cuboid shown can also be different. Figure 2 The embodiments shown are cylindrical or other shapes, but are not limited to these.

[0085] For ease of description, this application primarily uses a near-rectangular-pitch battery device 10 as an example. Furthermore, based on this rectangular-pitch battery device 10, this application defines three reference directions. The width direction of the battery device 10 is the first direction X, the length direction is the second direction Y, and the height direction is the third direction Z. The width, length, and height directions of the battery device 10 are perpendicular to each other, and the width dimension of the battery device 10 is smaller than its length dimension.

[0086] In some embodiments, to improve the space utilization within the battery device 10, the battery cells 20 within the battery device 10 are typically arranged in a certain pattern. For example, as... Figure 2 As shown, the battery device 10 may include a plurality of battery cells 20 arranged along the second direction Y; further, if the number of battery cells 20 in the battery device 10 is large, the battery device 10 may also include a plurality of battery cell assemblies 14 arranged along the first direction X.

[0087] A single battery cell 20 generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the single battery cell 20, 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 between them while allowing active ions to pass through.

[0088] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0089] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0090] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0091] In some embodiments, the battery cell 20 includes at least one electrode terminal 21, which is electrically connected to a tab. The electrode terminal 21 can be directly connected to the tab or indirectly connected to the tab via a current collector.

[0092] Each battery cell 20 has a first wall 201, on which one or more electrode terminals 21 may be provided. For example, the first wall 201 may have two electrode terminals, meaning that each battery cell 20 may have two electrode terminals on its first wall 201.

[0093] Multiple battery cells 20 have multiple electrode terminals 21 on their first walls 201. This means that each of the multiple battery cells 20 has one or more electrode terminals 21 on its first wall 201, thus providing multiple electrode terminals 21 on the first walls 201 of the multiple battery cells 20. Alternatively, some of the battery cells 20 may have one or more electrode terminals 21 on their first walls 201, while others may not have electrode terminals 21 on their first walls 201.

[0094] For example, each of the multiple battery cells 20 may have two electrode terminals 21 on its first wall 201. Specifically, each of the multiple battery cells 20 may have one positive electrode terminal and one negative electrode terminal on its first wall 201. Alternatively, each of the multiple battery cells 20 may have multiple electrode terminals 21 on its first wall 201. Specifically, each of the multiple battery cells 20 may have multiple positive electrode terminals and multiple negative electrode terminals on its first wall 201.

[0095] The housing in this embodiment may include a base plate 11, which may be located on the side of the plurality of battery cells 20 near the bottom along the direction of gravity. It should be understood that when the battery device 10 is normally placed, the base plate 11 may be located on the side of the battery cells 20 closest to the ground, so that the base plate 11 can withstand external impacts on the battery cells 20, thereby protecting the battery cells 20.

[0096] The first wall 201 of the battery cell 20 is disposed facing the base plate 11, that is, the first wall 201 is the wall of the battery cell 20 facing the base plate 11.

[0097] An electrode terminal 21 is provided on the first wall 201 of the battery cell 20, and the first wall 201 is oriented toward the base plate 11. That is, the electrode terminal 21 is provided on the first wall 201, such that the electrode terminal 21 is oriented toward the base plate 11.

[0098] The base plate 11 has a protrusion 111 that protrudes outward toward the accommodating space, specifically toward the side of the base plate 11 away from the battery cell 20. This results in an uneven surface on the side of the base plate 11 away from the battery cell 20. The protrusion 111 increases the local rigidity of the base plate 11, making the area of ​​the protrusion 111 less prone to deformation under external impact or large collisions, thus improving the impact resistance of the base plate 11.

[0099] The base plate 11 has multiple protrusions 111, and each of the multiple protrusions 111 corresponds to a multiple of the electrode terminals 21. That is, the multiple protrusions 111 are respectively located in the area of ​​the multiple electrode terminals 21 facing the base plate 11. In other words, the orthographic projection of each protrusion 111 on the base plate 11 at least partially overlaps with the orthographic projection of the corresponding electrode terminal 21 on the base plate 11. This makes the area of ​​the base plate 11 corresponding to the electrode terminal 21 less prone to deformation, reduces the risk of the electrode terminal 21 being damaged by external impact, and improves the reliability of the battery device 10.

[0100] In this embodiment, on the one hand, the base plate 11 is provided with a plurality of protrusions 111, which can enhance the local rigidity of the base plate 11, making the area where the protrusions 111 are located less prone to deformation under external impact or collision, thereby improving the impact resistance of the base plate 11. On the other hand, the plurality of protrusions 111 are respectively provided in the areas of the plurality of electrode terminals 21 facing the base plate 11, thereby protecting the plurality of electrode terminals 21, reducing the risk of the electrode terminals 21 being damaged by external impact, and improving the reliability of the battery device 10.

[0101] In some embodiments, such as Figure 5 As shown, Figure 5 As shown Figure 4 The enlarged view of the battery device 10 shown shows that, along the thickness direction of the base plate 11, the orthographic projection of the electrode terminal 21 on the base plate 11 is located within the area of ​​the orthographic projection of the protrusion 111 on the base plate 11.

[0102] The orthographic projection of the protrusion 111 on the base plate 11 covers the orthographic projection of the electrode terminal 21 on the base plate 11. That is, the coverage area of ​​the protrusion 111 on the base plate 11 is greater than or equal to the projection area of ​​the electrode terminal 21 on the base plate 11, so that the electrode terminal 21 can be completely covered by the corresponding protrusion 111 in the thickness direction of the base plate 11, thereby better protecting the electrode terminal 21.

[0103] In this embodiment, the orthographic projection of the protrusion 111 on the base plate 11 covers the area of ​​the orthographic projection of the corresponding electrode terminal 21 on the base plate 11, so that the protrusion 111 can cover the area around the electrode terminal 21. In the event of an external impact to the base plate 11, any area of ​​the electrode terminal 21 can be protected, further reducing the risk of the electrode terminal 21 being damaged by external impact.

[0104] It should be understood that the shape of the protrusion 111 protruding outwards from the receiving space can be any shape. For example, the shape of the protrusion 111 can be prism, frustum, prismatic, or spherical, etc. That is, the outer surface of the protrusion 111 protruding outwards from the receiving space can be any plane, curved surface, or a combination of plane and curved surface. Figures 6 to 8 As shown, Figures 6 to 8The cross-sectional schematic diagrams of the protrusion 111 on a plane parallel to the thickness direction of the base plate 11 are shown.

[0105] In some embodiments, the surface of the protrusion 111 away from the base plate 11 is curved. That is, the surface of the protrusion 111 that protrudes outward toward the receiving space is curved.

[0106] It should be understood that the surface of the protrusion 111 furthest from the base plate 11 can refer to the surface of the protrusion 111 closest to the outside of the receiving space. A curved surface can refer to any surface with curvature or unevenness, or a surface of the protrusion 111 furthest from the base plate 11 that is not parallel to the base plate 11. For example, as... Figure 6 As shown, the cross-sectional shape of the protrusion 111 can be an inverted triangle. For example, as... Figure 7 As shown, the cross-sectional shape of the protrusion 111 can be an irregular polygon.

[0107] In this embodiment, the surface of the protrusion 111 away from the base plate 11 is designed as a curved surface, so that when the protrusion 111 is hit by an external ball, the curved surface can decompose the impact force into forces in different directions, thereby reducing the risk of deformation caused by local impact on the protrusion 111 and improving the protective capability of the protrusion 111 against the electrode terminal 21.

[0108] In some embodiments, such as Figure 8 As shown, the surface of the protrusion 111 away from the base plate 11 can also be a hemispherical surface. That is, the surface of the protrusion 111 that protrudes outward from the receiving space is a hemispherical surface, or the cross-sectional shape of the protrusion 111 is arc-shaped.

[0109] In this embodiment, the surface of the protrusion 111 away from the base plate 11 is designed as a hemispherical surface, which can evenly disperse the pressure generated by external impact, reduce local stress concentration, and reduce the risk of deformation of the base plate 11. Furthermore, when the protrusion 111 is hit by an external ball, the spherical surface has a certain curvature, so that any position of the protrusion 111 can decompose the impact force into forces in different directions, thereby guiding the impacting stone or other impacting object to deflect to other areas of the base plate 11, thereby transferring the impact force to the area corresponding to the electrode terminal 21 in the base plate 11, further reducing the risk of the electrode terminal 21 being damaged by external impact, and improving the reliability of the battery device 10.

[0110] In some embodiments, continue to refer to Figure 5 The value range of the height H of the protrusion 111 extending beyond the base plate 11 along the thickness direction of the base plate 11 is: 5mm≤H≤6mm.

[0111] It should be understood that, in the thickness direction of the base plate 11, the height of the protrusion 111 beyond the base plate 11 can refer to the distance between the farthest position of the protrusion 111 from the base plate 11 and the side of the base plate 11 closest to the outside of the receiving space.

[0112] In this embodiment, the protrusion 111 extends beyond the base plate 11 by a height H greater than or equal to 5mm along the thickness direction of the base plate 11. This improves the local rigidity of the base plate 11, making the area where the protrusion 111 is located less prone to deformation under external impact or collision, reducing the risk of the electrode terminal 21 being damaged by external impact, and improving the reliability of the battery device 10. Furthermore, setting the protrusion 111 to extend beyond the base plate 11 by a height H less than or equal to 6mm along the thickness direction of the base plate 11 reduces the space occupied by the protrusion 111 and improves the overall space utilization of the battery device 10.

[0113] In some embodiments, the height H of the protrusion 111 extending beyond the base plate 11 along the thickness direction of the base plate 11 can be set to other values. For example, the value of H can be any one of the following values ​​or between any two of the following values: 5mm, 5.05mm, 5.1mm, 5.15mm, 5.2mm, 5.25mm, 5.3mm, 5.35mm, 5.4mm, 5.45mm, 5.5mm, 5.55mm, 5.6mm, 5.65mm, 5.7mm, 5.75mm, 5.8mm, 5.85mm, 5.9mm, 5.95mm, 6mm.

[0114] It should be understood that the protrusion 111 can be formed by stamping the base plate 11 or by injection molding it integrally with the base plate 11, and the processing method of the protrusion 111 in the embodiments of this application is not limited to this.

[0115] In some embodiments, the battery device 10 may include a plurality of battery cells 20, and the plurality of battery cells 20 may include a plurality of electrode terminals 21. One or more protrusions 111 may be provided. For example, if a plurality of protrusions 111 are provided, then the plurality of protrusions 111 may correspond one-to-one with the plurality of electrode terminals 21. As another example, if a plurality of protrusions 111 are provided, one protrusion 111 may correspond to a plurality of electrode terminals 21.

[0116] The number of protrusions 111 can be equal to or different from the number of electrode terminals 21. For example, the number of protrusions 111 can be equal to the number of electrode terminals 21, and each electrode terminal 21 is provided with one protrusion 111. Or, for another example, the number of electrode terminals 21 can be 10 times the number of protrusions 111, and one protrusion 111 is provided for every 10 electrode terminals 21.

[0117] Multiple protrusions 111 are provided in a one-to-one correspondence with multiple electrode terminals 21, that is, each electrode terminal 21 in the multiple electrode terminals 21 is provided with a corresponding protrusion, and the number of multiple protrusions 111 can be equal to the number of multiple electrode terminals 21.

[0118] In some embodiments, such as Figure 9 As shown, Figure 9 As shown Figure 1 The diagram shows a partial structural schematic of the battery device 10. The battery device 10 includes a plurality of battery cells 20 arranged along the second direction Y. A protrusion 111 extends along the second direction Y. The orthographic projection of the electrode terminals 21 of the plurality of battery cells 20 on the base plate 11 is located within the area of ​​the orthographic projection of the protrusion 111 on the base plate 11. The second direction Y is perpendicular to the first direction X.

[0119] It should be understood that the multiple battery cells 20 are arranged along the second direction Y, and thus the electrode terminals 21 of the multiple battery cells 20 are also arranged along the second direction Y. When a battery cell 20 includes two electrode terminals 21, the electrode terminals 21 of the multiple battery cells 20 are arranged along the second direction Y to form two rows of electrode terminals 21.

[0120] The protrusion 111 can extend along the second direction Y, such that the orthographic projection of the protrusion 111 on the base plate 11 covers the orthographic projection of the corresponding plurality of electrode terminals 21 arranged along the second direction Y on the base plate 11, that is, the plurality of electrode terminals 21 arranged along the second direction Y are all directly opposite a protrusion 111 extending along the second direction Y.

[0121] It should be understood that multiple protrusions 111 can be provided, and the number of protrusions 111 can be the same as or different from the number of columns of multiple electrode terminals 21 arranged along the second direction Y. For example, multiple protrusions 111 may extend along the second direction Y and be respectively provided corresponding to multiple columns of electrode terminals 21. As another example, one protrusion 111 may also be provided corresponding to two columns of electrode terminals 21. As yet another example, two protrusions 111 may respectively correspond to the front half of the electrode terminals 21 and the rear half of the electrode terminals 21 arranged along the second direction Y, so that one column of electrode terminals 21 is provided with two protrusions 111.

[0122] In this embodiment, by extending the protrusion 111 along the second direction Y, the area where the protrusion 111 is located can cover multiple electrode terminals 21, thereby protecting the electrode terminals 21 and reducing the risk of the electrode terminals 21 being damaged by external impact. At the same time, the protrusion 111 extending along the second direction Y can be quickly aligned with multiple electrode terminals 21 arranged along the second direction Y, which facilitates the rapid installation of the base plate 11 and the battery cell 20.

[0123] It should be understood that the protrusion 111 extending along the second direction Y can be rectangular, semi-cylindrical, or hemispherical, etc. For example, the protrusion 111 can be rectangular, that is, the shape of the cross section of the protrusion perpendicular to the second direction Y can be rectangular.

[0124] In some embodiments, the shape of the protrusion 111 in the cross section perpendicular to the second direction Y is arc-shaped. That is, the protrusion 111 protruding from the bottom plate 11 toward the outside of the receiving space is semi-cylindrical or hemispherical, so that the surface of the protrusion 111 away from the bottom plate 11 is a curved surface with a certain curvature.

[0125] In this embodiment, the protrusion 111 extending along the second direction Y is designed to have an arc shape in the cross section perpendicular to the second direction Y, so that the force of external impact can be decomposed at any position of the protrusion 111 and transmitted to other areas of the base plate 11, reducing the risk of the electrode terminal 21 corresponding to that area being damaged by external impact, thereby improving the reliability of the battery device 10.

[0126] Figure 10 As shown Figure 2 A partial structural schematic diagram of the battery device 10 shown; Figure 11 As shown Figure 3 Another schematic diagram of the battery device 10 shown along section line A-A'; Figure 12 As shown Figure 11 A partial enlarged view of the battery device 10 shown; Figure 13 As shown Figure 2 A bottom view of a portion of the structure of the battery device 10 shown along the first direction Z; Figure 14 As shown Figure 1 Another schematic diagram of the battery device 10 shown; Figure 15 As shown Figure 3 Another schematic diagram of the battery device 10 shown along section line A-A'. Next, we will combine... Figures 10 to 14 The structural details of the battery device 10 are described in detail.

[0127] In some embodiments, such as Figure 10 As shown, a buffer 12 can be provided between the battery cell 20 and the base plate 11.

[0128] It should be understood that the buffer 12 can be disposed at any position between the battery cell 20 and the base plate 11. For example, the buffer 12 can be disposed on the side closer to the base plate 11 and cover the first wall 201 of the battery cell 20. Alternatively, the buffer 12 can cover the edge portion of the first wall 201 of the battery cell 20. Furthermore, the buffer 12 can also cover the area corresponding to the electrode terminals 21 of the battery cell 20.

[0129] In this embodiment, by providing a buffer 12 between the base plate 11 and the battery cell 20, when the base plate 11 is impacted, the buffer 12 can be squeezed to form a support between the base plate 11 and the battery cell 20. The buffer 12 absorbs part of the impact force, reducing the risk of the battery cell 20 being damaged by external impact, thereby improving the reliability of the battery device 10.

[0130] In some embodiments, such as Figure 11 and Figure 12 As shown, a pressure relief mechanism 22 can also be provided on the first wall 201. The buffer 12 is attached to the side of the base plate 11 near the battery cell 20, and there is a gap between it and the pressure relief mechanism 22.

[0131] The battery cell 20 in this embodiment may be provided with a pressure relief mechanism 22, which can be used to discharge the internal gas of the battery cell 20.

[0132] For example, the internal pressure or temperature of the battery cell 20 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 20 reaches the predetermined threshold, the pressure relief mechanism 22 is activated or a weak structure in the pressure relief mechanism 22 is damaged, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements.

[0133] It should be understood that actuation can refer to the pressure relief mechanism 22 being activated or reaching a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The actions of the pressure relief mechanism 22 may include, but are not limited to: movement of components within the pressure relief mechanism 22 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 22, etc. When the pressure relief mechanism 22 is actuated, the high-temperature, high-pressure substances inside the battery cell 20 are discharged outwards from the actuated portion as emissions. In this way, the battery cell 20 can be depressurized and de-temperatured under controllable pressure or temperature, thereby preventing potentially more serious accidents. The emissions from the battery cell 20 include, but are not limited to: electrolyte, dissolved or broken positive and negative electrode plates, fragments of separators, high-temperature, high-pressure gases generated by the reaction, flames, etc.

[0134] It should be understood that the pressure relief mechanism 22 can be located in any region of the first wall 201. For example, the pressure relief mechanism 22 can be located near the center of the first wall 201. Or, for example, the pressure relief mechanism 22 can be located near the edge of the first wall 201.

[0135] The first wall 201 of the battery cell 20 is the wall of the battery cell 20 facing the base plate 11. The pressure relief mechanism 22 is provided on the first wall 201, so that the pressure relief direction is towards the base plate 11, to prevent high temperature and high pressure gas or ejected material from directly impacting adjacent battery cells 20, circuits or other structures, and to reduce the risk of heat spread.

[0136] The buffer 12 is attached to the side of the base plate 11 near the battery cell 20, that is, the buffer 12 is located between the base plate 11 and the first wall 201 of the battery cell 20. The buffer 12 is attached to the base plate 11, so that the buffer 12 can be installed together with the base plate 11 when installing the base plate 11, thereby simplifying the installation method of the battery device 10 and improving the installation efficiency.

[0137] There is a gap between the buffer 12 and the pressure relief mechanism 22, that is, the buffer 12 and the pressure relief mechanism 22 are spaced apart along the thickness direction of the base plate 11, so that there is a gap space between the pressure relief mechanism 22 and the buffer 12, so that the discharge from the pressure relief mechanism 22 can flow and be discharged quickly, reducing the risk of battery cell 20 failure and improving the reliability of battery device 10.

[0138] In this embodiment, by placing the pressure relief mechanism 22 on the first wall 201 and positioning it towards the base plate 11, it is possible to prevent high-temperature, high-pressure gas or ejected material from directly impacting adjacent battery cells 20, circuits, or other structures, thereby reducing the risk of heat spread. A gap exists between the buffer member 12 and the pressure relief mechanism 22, allowing the emissions from the pressure relief mechanism 22 to flow and dissipate quickly, reducing the risk of battery cell 20 failure and improving the reliability of the battery device 10. Furthermore, the buffer member 12 is adhered to the base plate 11, allowing it to be installed along with the base plate 11, thus simplifying the installation of the battery device 10 and improving installation efficiency.

[0139] In some embodiments, such as Figure 11 and Figure 13 As shown, the battery device 10 also includes a plurality of support members 13 spaced apart along the first direction X and a plurality of battery cell assemblies 14 arranged along the first direction X. Each battery cell assembly 14 includes a plurality of battery cells 20 arranged along the second direction Y. The plurality of support members 13 extend along the second direction Y. The first walls 201 of the battery cells 20 of two adjacent battery cell assemblies 14 along the first direction X abut against the same support member 13. The buffer member 12 extends along the second direction Y and is disposed on both sides of the support member 13 along the first direction X. Along the thickness direction of the base plate 11, the orthographic projection of the electrode terminal 21 on the base plate 11 is located in the area of ​​the orthographic projection of the buffer member 12 on the base plate 11. The second direction Y is perpendicular to the first direction X.

[0140] In this embodiment, the support members 13 are spaced apart along the first direction X, and in the first direction X, the first walls 201 of two adjacent battery cells 20 abut against the same support member 13. That is, in the third direction Z, the projection of the support member 13 at least partially overlaps with the projection of the first wall 201 of the battery cell 20, and the overlapping part is located in the regions on both sides of the first wall 201 along the first direction X.

[0141] It should be understood that the projection of the support member 13 in the third direction Z does not coincide with the projection of the electrode terminal 21 in the third direction Z. For example, if two electrode terminals 21 are provided on the first wall 201 of the battery cell 20, the region of the first wall 201 located outside the two electrode terminals 21 along the first direction X abuts against the support member 13.

[0142] Furthermore, the projection of the support member 13 onto the third direction Z does not coincide with the projection of the pressure relief mechanism 22 onto the third direction Z. That is, the support member 13 can be located in other areas of the first wall 201 besides the electrode terminal 21 and the pressure relief mechanism 22.

[0143] The support member 13 can have a certain thickness. The first wall 201 of the battery cell 20 is mounted on the support member 13, which can increase the distance between the battery cell 20 and the base plate 11. This raises the space between the pressure relief mechanism 22 and the base plate 11 or the buffer member 12, further increasing the discharge rate of the effluent inside the battery cell 20 and improving the reliability of the battery cell 20. In addition, the space can be directly used as a pressure relief channel, eliminating the need for additional discharge pipelines, thereby increasing the discharge speed while simplifying the internal structure of the battery device 10.

[0144] Multiple support members 13 are spaced apart and abut against the first wall 201 of two adjacent battery cells 20. The length of each support member 13 in the first direction X only needs to be sufficient to abut against the first wall 201 of two adjacent battery cells 20, thereby saving the amount of support members 13 and reducing the overall weight of the battery device 10 to improve the lightweighting.

[0145] Multiple support members 13 extend along the second direction Y, so that the first walls 201 of multiple battery cells 20 arranged along the second direction Y can all abut against the support members 13, thereby improving the overall structural stability of the battery device 10.

[0146] The buffer 12 extends along the second direction Y, so that the multiple battery cells 20 arranged along the second direction Y are all provided with buffer 12 between them and the base plate. That is, the base plate 11 and any battery cell 20 are supported by the buffer 12. The buffer 12 absorbs part of the impact force, further reducing the risk of the battery cell 20 being damaged by external impact.

[0147] The buffer 12 is disposed on both sides of the support 13 along the first direction X, that is, the buffer 12 and the support 13 can be disposed alternately along the first direction X.

[0148] It should be understood that the length of the buffer 12 along the first direction X can be less than or equal to the spacing between the support members 13 located on both sides of the buffer 12. For example, the length of the buffer 12 along the first direction X is equal to the spacing between the support members 13 located on both sides of the buffer 12, that is, the buffer 12 covers all other areas in the first wall 201 except for the support members 13, thereby increasing the contact area between the buffer 12 and the base plate 11, thereby better absorbing the impact force on the side of the base plate 11, and further reducing the risk of the battery cell 20 being damaged by external impact.

[0149] The buffer 12 is disposed on both sides of the support 13 along the first direction X, and the orthographic projection of the electrode terminal 21 on the base plate 11 is located in the area of ​​the orthographic projection of the buffer 12 on the base plate 11. That is, the buffer 12 can cover the area where the electrode terminal 21 is located on the first wall 201. When the base plate 11 is hit by a ball, the buffer 12 can absorb part of the impact force, thereby better protecting the electrode terminal 21 and reducing the risk of the electrode terminal 21 being damaged by external impact.

[0150] In this embodiment, by providing the support member 13, on the one hand, when the base plate 11 is impacted, the support member 13 can be squeezed to form a support between the base plate 11 and the battery cell 20, and the support member 13 can maintain a certain gap between the base plate 11 and the battery cell 20, so that the gap space can absorb part of the deformation caused by the impact, reduce the risk of the battery cell 20 being damaged by external impact, and improve the reliability of the battery device 10; on the other hand, the support member 13 can better support the battery cell 20, improving the stability of the battery device 10. In addition, by providing the buffer member 12 on both sides of the support member 13 along the first direction X, when the base plate 11 is impacted, the buffer member 12 can absorb part of the impact force, and the protrusion 111 can transmit part of the impact force to the area where the support member 13 is located. By squeezing the buffer member 12 and the support member 13, both the buffer member 12 and the support member 13 can form a support between the battery cell 20 and the base plate 11, thereby improving the protective performance of the protrusion 111 against the electrode terminal 21.

[0151] In some embodiments, such as Figure 14 and Figure 15As shown, the box also includes a frame 15 and a cover 16. The frame 15 has a first opening 1501 and a second opening 1502 on both sides along the third direction Z, and the first opening 1501 and the second opening 1502 are interconnected. The cover 16 is connected to the frame 15 and closes the first opening 1501. The bottom plate 11 is connected to the frame 15 and closes the second opening 1502. The frame 15, the cover 16 and the bottom plate 11 together define an accommodating space. The support member 13 is connected to the frame 15 at both ends along the second direction Y. The third direction Z is perpendicular to the first direction X and the second direction Y.

[0152] It should be understood that the frame 15 of the battery device 10 in this embodiment can be used to support multiple battery cells 20. The frame 15 in this embodiment can be a hollow structure formed by four beams connected end-to-end, and has at least one opening. For example, the frame 15 can have two openings, located at both ends of the frame 15 along the first direction Z. The frame 15 can also have multiple openings, for example, four openings, located at the four end faces of the frame 15 parallel to the first direction Z. This embodiment is not limited to these.

[0153] In this embodiment, the frame 15 may further include multiple beams, such as multiple longitudinal beams and multiple transverse beams between four beams arranged in pairs opposite each other. Furthermore, the cross-sectional shape of each beam may be rectangular, polygonal, plate-shaped, or irregular, such as L-shaped, T-shaped, or C-shaped.

[0154] In some embodiments, the frame 15 may have a first opening 1501 and a second opening 1502, and the first opening 1501 and the second opening 1502 are respectively located on both sides of the frame 15 along a third direction Z. A plurality of battery cells 20 can be placed from the first opening 1501 or the second opening 1502 into the receiving space formed by the cover 16, the frame 15 and the base plate 11.

[0155] In this embodiment of the application, the cover 16 and the base plate 11 of the battery device 10 can both be connected to the frame 15 and respectively cover the two openings of the frame 15.

[0156] It should be understood that the structures of the cover 16 and the base plate 11 in this application embodiment can be configured according to actual applications. For example, the cover 16 and the base plate 11 can both be hollow cuboids with one face as an opening. The opening of the cover 16 is opposite to the first opening 1501 of the frame 15, and the opening of the base plate 11 is opposite to the second opening 1502 of the frame 15. The cover 16 and the side containing the first opening 1501 of the frame 15 are interlocked, and the base plate 11 and the side containing the second opening 1502 of the frame 15 are interlocked. The cover 16, the frame 15, and the base plate 11 together form a closed chamber.

[0157] For example, the cover 16 is a hollow cuboid with one open side, and the base plate 11 is a plate-like structure with a certain thickness. The opening of the cover 16 is positioned opposite to the first opening 1501 of the frame 15, so that the cover 16 covers the first opening 1501 of the frame 15. The base plate 11 covers the second opening 1502 of the frame 15, and the cover 16, the frame 15, and the base plate 11 together form a closed chamber.

[0158] The enclosed chamber formed by the cover 16, frame 15, and base plate 11 can accommodate one or more battery cells 20. Multiple battery cells 20 are connected in parallel, series, or mixed configurations and placed within the accommodating space formed by the sequential fastening of the cover 16, frame 15, and base plate 11. The cover 16, frame 15, and base plate 11 have a simple structure and can be adapted to different models of battery cells 20, allowing for modular production. Furthermore, the cover 16 and frame 15, and the frame 15 and base plate 11, can be connected using simple methods such as connectors, adhesive bonding, or thermal fusion, enabling rapid assembly of the battery device 10 and improving its assembly efficiency. Alternatively, the frame 15 and base plate 11 can be integrally formed. For example, the base plate 11 has a plate-like structure, with its edges bent to form the frame 15. In addition, the openings on both sides of the frame 15 are connected to the cover 16 and the bottom plate 11 respectively. Compared with the one-piece box structure, it is easier to replace the cover 16 and the bottom plate 11 without the need to add an extra protective plate to resist external ball impacts. This simplifies the structure of the battery device 10 and improves the overall lightweight of the battery device 10.

[0159] It should be understood that the shapes of the cover 16, frame 15 and base plate 11 in the embodiments of this application can be determined according to the shape of the components that are commonly housed by the three, for example, according to the shape of the combination of multiple battery cells 20 housed inside.

[0160] The support member 13 of this embodiment can be accommodated within the accommodating space formed by the cover 16, the frame 15, and the base plate 11. The support member 13 can be connected to the frame 15 to support the battery cell 20. Compared with the lower housing which is integrally injection molded, the structure of the support member 13 combined with the frame 15 is lighter and simpler, thereby improving the weight reduction of the battery device 10 and enhancing the battery device 10's range.

[0161] The support member 13 can be used to support the battery cell 20. The support member 13 can be connected to the frame 15 or integrally formed with the frame 15.

[0162] It should be understood that the connection between the support member 13 and the frame 15 may include bonding, snap-fitting, or connection by screws or bolts.

[0163] The connection between the support member 13 and the frame 15 can mean that the support member 13 is directly connected to the frame 15, or that the support member 13 is connected to the frame 15 through other components.

[0164] For example, in some embodiments, the frame 15 has a plurality of crossbeams arranged along a second direction Y, the crossbeams extending along a third direction X and connecting at both ends of the third direction X to two of the four beams of the frame 15 arranged along the third direction X. The support member 13 can then be connected to one or more of the crossbeams in the frame 15, thereby connecting the support member 13 to the frame 15 via the crossbeams.

[0165] For example, the two ends of the support member 13 along the second direction Y are respectively connected to two of the four beams of the frame 15 arranged along the second direction Y.

[0166] In this embodiment, on the one hand, the openings on both sides of the frame 15 are connected to the cover 16 and the base plate 11 respectively. Compared with an integrated box structure, this facilitates the replacement of the cover 16 and the base plate 11 without the need for additional protective plates to resist external ball impacts, simplifying the structure of the battery device 10 and improving the overall lightweighting of the battery device 10. On the other hand, the support member 13 is connected to the frame 15, which improves the stability of the support member 13. Furthermore, the expansion force of the battery cell 20 can be transmitted to the frame 15 through the support member 13, with the frame 15 resisting part of the expansion force, thereby improving the overall anti-expansion performance of the battery device 10.

[0167] In some embodiments, such as Figure 15 As shown, the base plate 11 can be set on the side of the frame 15 away from the cover 16, and there is a gap between it and the support member 13.

[0168] That is, the base plate 11 and the support member 13 are spaced apart, so that there is also a gap between the battery cell 20 and the base plate 11.

[0169] In this embodiment, the base plate 11 is disposed on the side of the frame 15 away from the cover 16 and spaced apart from the support member 13, so that the battery cell 20 can be supported by the support member 13 or the frame 15, thereby reducing the load on the battery cell 20 by the base plate 11, reducing the wear on the base plate 11, and thus improving the performance of the battery device 10.

[0170] In some embodiments, continue to refer to Figure 15 A buffer 12 may be provided in the gap between the support member 13 and the base plate 11.

[0171] It should be understood that the buffer 12 can completely fill the gap between the base plate 11 and the support 13, or it can partially fill the gap between the base plate 11 and the support 13.

[0172] A buffer 12 is provided in the gap between the base plate 11 and the battery cell 20. When the battery device 10 is subjected to external impacts or other problems, the buffer 12 can absorb the impact force, so that the support 13 is subjected to less compression, thereby further protecting the battery cell 20, reducing the risk of damage to the battery cell 20, and thus improving the reliability of the battery device 10.

[0173] In some embodiments, the support member 13 has a flow channel inside for a heat exchange medium to pass through, the heat exchange medium being used to regulate the temperature of the battery cell 20.

[0174] It should be understood that the support member 13 has internal flow channels, meaning that the support member 13 can be a hollow structure, and reinforcing ribs can be provided inside the support member 13 to improve its strength. Specifically, the support member 13 can be a water-cooled plate. The heat exchange medium can be any substance capable of transferring heat, having a heating or cooling effect, thereby regulating the temperature of the battery device 10. The type of heat exchange medium is not limited; it can be gaseous or liquid, as long as the heat exchange medium can pass through the flow channels to achieve the function of temperature regulation.

[0175] The support member 13 of this application embodiment has internal flow channels, which can restrict the movement of the battery cell 20 while also regulating the temperature of the battery cell 20. In cases where the temperature of the battery cell 20 is too high or too low, it can dissipate heat or cool the battery cell 20, reducing the risk of battery cell 20 failure and thus improving the overall performance of the battery device 10. Furthermore, the internal flow channels of the support member 13, i.e., the support member 13 is a hollow structure, make the support member 13 more resistant to tension, and can unload the expansion force of the battery cell 20 in its length direction, reducing the risk of battery cell 20 failure due to expansion and compression. In addition, integrating the temperature regulation function into the support member 13 can save space for a separate temperature regulation system, making the battery device 10 more compact and improving the performance of the battery device 10.

[0176] In some embodiments, the flow channel inside the support member 13 may extend along the second direction Y, so that the flow channel can penetrate the interior of the support member 13 extending along the second direction Y, thereby enabling temperature regulation of the plurality of battery cells 20 arranged along the second direction Y.

[0177] In some embodiments, the thickness T of the base plate 11 satisfies 0.8mm≤T≤1mm.

[0178] In this embodiment, the thickness T of the base plate 11 is set to be greater than or equal to 0.8 mm, which can improve the strength of the base plate 11, thereby improving the ability of the base plate 11 to resist external ball impacts and reducing the risk of damage to the battery cell 20; if the thickness T of the base plate 11 is set to be less than or equal to 1 mm, the weight of the base plate 11 can be further reduced while the base plate 11 has sufficient strength, thereby improving the lightweighting of the battery device 10.

[0179] In some embodiments, the thickness T of the base plate 11 in this application embodiment can also be set to other values. For example, the value of T can be any one of the following values ​​or between any two of the following values: 0.8mm, 0.81mm, 0.82mm, 0.825mm, 0.83mm, 0.84mm, 0.85mm, 0.86mm, 0.87mm, 0.875mm, 0.88mm, 0.89mm, 0.9mm, 0.91mm, 0.92mm, 0.925mm, 0.93mm, 0.94mm, 0.95mm, 0.96mm, 0.975mm, 0.98mm, 0.99mm, 1mm.

[0180] It should be understood that the connection between the base plate 11 and the frame 15, and between the cover 16 and the frame 15, may include welding, snap-fitting, fastener connection, bonding, or thermoforming connection.

[0181] For example, in some embodiments, the base plate 11 and the frame 15 can be connected by fasteners; and / or, the cover 16 and the frame 15 can also be connected by fasteners. Specifically, the frame 15 and the base plate 11 or the cover 16 can be bolted together, and a seal can be provided in the connection area between the frame 15 and the base plate 11 or the cover 16, thereby improving the airtightness of the battery device 10.

[0182] In some embodiments, the base plate 11 and the frame 15 may also be connected by adhesive bonding or heat fusion; and / or, the cover 16 and the frame 15 may be connected by adhesive bonding or heat fusion.

[0183] In this embodiment of the application, the base plate 11 and the frame 15 are connected by adhesive bonding or hot-melt bonding. When the base plate 11 cracks or is damaged due to problems such as being hit by stones during use and needs to be replaced, its connection with the frame 15 can be broken more quickly by secondary hot-melt bonding or other methods, and then reconnected by adhesive bonding or hot-melt bonding.

[0184] It should be understood that the connection between the cover 16 and the frame 15 is also similar, through adhesive bonding or hot-melt bonding. When the cover 16 needs to be replaced due to cracking or damage caused by stones or other issues during use, the connection between it and the frame 15 can be broken by secondary hot-melt bonding or other methods, and a new cover 16 can be replaced and hot-melt / adhesively bonded to the frame 15. This facilitates disassembly without damaging the undamaged frame 15.

[0185] Furthermore, the cover 16 and the base plate 11 can be made of plastic or metal. For example, the cover 16 and the base plate 11 can be made of plastic, thereby achieving a lightweight design for the battery device 10. It should be understood that the cover 16 and the base plate 11 can also be made of other materials, such as metal or composite materials. For example, the cover 16 and / or the base plate 11 can also be sheet metal, thereby improving the structural strength of the battery device 10.

[0186] In this embodiment, the cover 16 and the frame 15 are connected by adhesive bonding or thermal fusion; and / or, the base plate 11 and the frame 15 are connected by adhesive bonding or thermal fusion. This improves the connection strength between the two components and allows for quick replacement of the faulty component without damaging other components in the event of a failure in one component. This improves the utilization rate of the battery device 10 and further enhances its performance. Furthermore, adhesive bonding or thermal fusion enables sealing between the cover 16 and the frame 15, and between the base plate 11 and the frame 15, without the need for additional structures such as sealing rings. This improves the sealing performance of the battery device 10 and simplifies its structure.

[0187] In some embodiments, the side of the base plate 11 away from the cover 16 is coated with a protective layer.

[0188] The side of the base plate 11 away from the cover 16 can refer to the side of the base plate 11 closest to the outside of the receiving space. The coating method of the protective layer can include spraying, pasting, etc.

[0189] The material of the protective layer may include one of the following: polyvinyl chloride, epoxy resin, polyester resin, fluorocarbon resin, ceramic, and rubber.

[0190] In this embodiment, by coating the outer side of the base plate 11 with a protective layer, it can play a role in corrosion prevention and also in buffering when hit by external balls, thereby improving the protective performance of the base plate 11.

[0191] This application embodiment also provides an electrical device, including the battery device 10 in any of the above embodiments, the battery device 10 being used to provide electrical energy to the electrical device. Specifically, the electrical device can be the above... Figure 1 The vehicle 1 shown can also be any electrical device that uses the battery device 10.

[0192] In some implementations, the electrical equipment can be a vehicle, a ship, or a spacecraft.

[0193] According to some embodiments of this application, see Figures 2 to 4 This application provides a battery device 10, including a housing and a plurality of battery cells 20. Specifically, the housing forms an accommodating space and has a bottom plate 11; the plurality of battery cells 20 are accommodated in the accommodating space, and a plurality of electrode terminals 21 are provided on the first wall 201 of the plurality of battery cells 20; the bottom plate 11 is located on the side of the plurality of battery cells 20 near the bottom along the direction of gravity, and the first wall 201 is disposed toward the bottom plate 11; wherein, the bottom plate 11 is provided with a plurality of protrusions 111 facing the outside of the accommodating space, and the plurality of protrusions 111 are respectively located in the region of the bottom plate 11 opposite to the plurality of electrode terminals 21.

[0194] Along the thickness direction of the base plate 11, the orthographic projection of the electrode terminal 21 on the base plate 11 is located within the area of ​​the orthographic projection of the protrusion 111 on the base plate 11.

[0195] The surface of the protrusion 111 that is away from the base plate 11 is curved.

[0196] 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 by, include: The box has a receiving space and a bottom plate (11); Multiple battery cells (20) are housed in the housing space. Multiple electrode terminals (21) are provided on the first wall (201) of the multiple battery cells (20). The base plate (11) is located on the side of the multiple battery cells (20) near the bottom along the direction of gravity. The first wall (201) is disposed facing the base plate (11). The base plate (11) is provided with a plurality of protrusions (111) facing outward of the accommodating space, and the plurality of protrusions (111) are respectively located in the region of the base plate (11) opposite to the plurality of electrode terminals (21).

2. The battery device according to claim 1, characterized by Along the thickness direction of the base plate (11), the orthographic projection of the electrode terminal (21) on the base plate (11) is located in the area of ​​the orthographic projection of the protrusion (111) on the base plate (11).

3. The battery device of claim 1, wherein The surface of the protrusion (111) away from the base plate (11) is curved.

4. The battery device of claim 1, wherein The surface of the protrusion (111) away from the base plate (11) is a hemispherical surface.

5. The battery device of claim 1, wherein The height H of the protrusion (111) extending beyond the base plate (11) along the thickness direction of the base plate (11) is in the range of 5mm≤H≤6mm.

6. The battery device of claim 1, wherein A buffer (12) is provided between the battery cell (20) and the base plate (11).

7. The battery device of claim 6, wherein The first wall (201) is also provided with a pressure relief mechanism (22), and the buffer (12) is attached to the side of the base plate (11) near the battery cell (20), and there is a gap between it and the pressure relief mechanism (22).

8. The battery device of claim 6, wherein, The battery device further includes a plurality of support members (13) spaced apart along a first direction and a plurality of battery cell assemblies (14) arranged along the first direction, wherein the battery cell assembly (14) includes a plurality of battery cells (20) arranged along a second direction. Multiple support members (13) extend along the second direction, and the first walls (201) of the battery cells (20) of two adjacent battery cell assemblies (14) along the first direction abut against the same support member (13). The buffer member (12) extends along the second direction and is disposed on both sides of the support member (13) along the first direction. Along the thickness direction of the base plate (11), the orthographic projection of the electrode terminal (21) on the base plate (11) is located in the area of ​​the orthographic projection of the buffer member (12) on the base plate (11). The second direction is perpendicular to the first direction.

9. The battery device of claim 8, wherein, The enclosure also includes: A frame (15) having a first opening (1501) and a second opening (1502) on both sides along a third direction, the first opening (1501) and the second opening (1502) being interconnected. A cover (16) is connected to the frame (15) and closes the first opening (1501); The base plate (11) is connected to the frame (15) and closes the second opening (1502). The base plate (11), the frame (15) and the cover (16) together define the receiving space. The support member (13) is connected to the frame (15) at both ends along the second direction. The third direction is perpendicular to the first direction and the second direction.

10. The battery device of claim 9, wherein, The base plate (11) is located on the side of the frame (15) away from the cover (16) and is spaced apart from the support member (13).

11. The battery device of claim 10, wherein, The buffer (12) is provided in the gap between the support (13) and the base plate (11).

12. The battery device of claim 8, wherein, The support member (13) has a flow channel inside for the heat exchange medium to pass through, which is used to regulate the temperature of the battery cell (20).

13. The battery device according to any one of claims 1 to 12, characterized by, The thickness T of the base plate (11) is in the range of 0.8mm≤T≤1mm.

14. The battery device according to any one of claims 1 to 12, characterized by, The side of the base plate (11) away from the receiving space is coated with a protective layer.

15. An electrical device, characterized by Includes a battery device according to any one of claims 1 to 14, the battery device being used to provide electrical energy.

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