Battery device and electric device

Abstract

The application provides a battery device and a power utilization device. The battery device comprises a box body and a battery cell. The box body has a containing cavity. The box body comprises a bottom plate and a bottom guard plate. The bottom plate is arranged on one side of the containing cavity along a first direction. The bottom guard plate is arranged on a side of the bottom plate away from the containing cavity. The battery cell is arranged in the containing cavity and connected to the bottom plate. The battery cell is provided with a pressure relief mechanism facing the bottom plate. The bottom guard plate comprises a first part and a second part. The first part and the second part are arranged and connected along a direction intersecting the first direction. The rigidity of the first part is greater than that of the second part. The first part comprises a plate body and a reinforcing piece. The reinforcing piece is arranged and connected with the plate body along the first direction. In the same plane perpendicular to the first direction, the orthographic projection of the reinforcing piece at least partially overlaps the orthographic projection of the pressure relief mechanism. According to the application, the reliability and cost of the battery device can be considered.

Description

Technical Field

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

[0002] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] In the development of battery technology, how to balance the reliability and cost of battery devices is an ongoing research direction. Summary of the Invention

[0004] In view of the above problems, this application provides a battery device and an electrical device that can balance the reliability and cost of the battery device.

[0005] In a first aspect, embodiments of this application provide a battery device, which includes a housing and battery cells. The housing has a receiving cavity and includes a bottom plate and a bottom protective plate. The bottom plate is disposed on one side of the receiving cavity along a first direction, and the bottom protective plate is disposed on the side of the bottom plate facing away from the receiving cavity. The battery cells are disposed in the receiving cavity and connected to the bottom plate. The battery cells are provided with a pressure relief mechanism facing the bottom plate. The bottom protective plate includes a first part and a second part, which are disposed and connected along a direction intersecting the first direction. The rigidity of the first part is greater than that of the second part. The first part includes a plate body and a reinforcing member, which are disposed and connected to the plate body along the first direction. In the same plane perpendicular to the first direction, the orthographic projection of the reinforcing member and the orthographic projection of the pressure relief mechanism at least partially overlap.

[0006] By designing the bottom protective plate in sections, a first section with higher rigidity is used in the area corresponding to the pressure relief mechanism, while a second section with relatively lower rigidity is used in other areas. When the battery device is subjected to external impact, the first section can provide key protection for the pressure relief mechanism, effectively reducing the risk of damage or failure of the pressure relief mechanism. At the same time, since the reinforcement is only applied to a local area of ​​the bottom protective plate, the increased cost caused by reinforcing the entire bottom protective plate is avoided. Therefore, both the reliability and cost of the battery device can be balanced.

[0007] In addition, by adding reinforcing members to the main body of the plate to improve the rigidity of the first part, not only is the manufacturing difficulty lower, but the reinforcing members can also be flexibly set according to different needs, thereby improving the overall design flexibility of the bottom protection plate.

[0008] In some embodiments of the first aspect, the dimension of the first portion along the first direction is greater than the dimension of the second portion along the first direction.

[0009] By differentiating the structural dimensions of the first and second parts, the rigidity of the first part can be increased by increasing its thickness, which can reduce processing complexity and help reduce costs.

[0010] In some embodiments of the first aspect, the reinforcing member is attached to the side of the plate body facing the base plate. This improves the appearance consistency of the base plate, thereby enhancing the appearance quality of the battery device.

[0011] In some embodiments of the first aspect, the second part is integrally formed with the plate body.

[0012] On the one hand, the second part does not require additional connection processes to connect to the main body of the panel, simplifying the manufacturing process. On the other hand, compared to connecting the second part to the main body of the panel through additional connection processes, the integrated structure of the second part and the main body of the panel provides higher structural strength.

[0013] In some embodiments of the first aspect, the reinforcing member includes a first reinforcing portion and a second reinforcing portion, the second reinforcing portion being connected between the first reinforcing portion and the plate body, and the elastic modulus of the second reinforcing portion being less than the elastic modulus of the first reinforcing portion.

[0014] The second reinforcing part has a smaller elastic modulus and a relatively soft texture. When the battery device is subjected to external impact, the second reinforcing part can form a deformation buffer between the first reinforcing member and the plate body, absorb the external impact load, and reduce the impact energy transmitted to the inside of the battery device, so as to further reduce the risk of damage or failure of the pressure relief mechanism, thereby further improving the reliability of the battery device.

[0015] In some embodiments of the first aspect, the second reinforcing portion includes an adhesive layer, and the first reinforcing portion is bonded to the board body via the adhesive layer.

[0016] The adhesive layer can form a deformation buffer between the first reinforcing member and the main body of the plate, while also fixing the first reinforcing member to the main body of the plate, which helps to reduce the structural complexity of the battery device and reduce costs.

[0017] In some embodiments of the first aspect, the first reinforcing portion is welded to the main body of the plate to form a welded portion, and the welded portion and the adhesive layer are disposed along a direction intersecting the first direction. This can further improve the connection strength between the first reinforcing portion and the main body of the plate.

[0018] In some embodiments of the first aspect, the weld portion is disposed around the adhesive layer.

[0019] This can improve the uniformity of stress distribution in the first reinforcing part and reduce the risk of local stress concentration, thereby further improving the connection reliability of the first reinforcing part.

[0020] In some embodiments of the first aspect, there are multiple battery cells and multiple first parts. At least one first part is provided corresponding to the pressure relief mechanism of multiple battery cells, or multiple first parts are provided in a one-to-one correspondence with the pressure relief mechanism of multiple battery cells.

[0021] In some embodiments of the first aspect, a cavity is provided between the bottom guard plate and the bottom plate.

[0022] When the battery device is subjected to external impact, the cavity can effectively absorb the external impact load and reduce the impact energy transmitted to the inside of the battery device, thereby further reducing the risk of damage or failure of the pressure relief mechanism and thus further improving the reliability of the battery device.

[0023] In some embodiments of the first aspect, the base plate includes a third portion and a fourth portion, which are disposed and connected along a direction intersecting the first direction. The stiffness of the third portion is less than that of the fourth portion, and the third portion is disposed adjacent to the pressure relief mechanism. In the same plane perpendicular to the first direction, the orthographic projection of the first portion and the orthographic projection of the third portion at least partially overlap.

[0024] The above technical solution provides targeted protection for the third part by setting up the first part, which can effectively reduce the risk of damage or failure of the pressure relief mechanism, thereby further improving the reliability of the battery device.

[0025] In some embodiments of the first aspect, the base plate includes a first plate body and a second plate body, the first plate body and the second plate body are welded to form a first weld, and the third portion includes the first weld.

[0026] The base plate of the above-mentioned technical solution is composed of multiple smaller plates (the first plate and the second plate) welded together, eliminating the need for direct processing of large-sized plates during manufacturing. This effectively reduces the difficulty and complexity of base plate preparation. Furthermore, it reduces reliance on large equipment, improves material utilization, and minimizes waste generation, thereby lowering costs while maintaining structural performance.

[0027] In some embodiments of the first aspect, the first weld extends along the second direction, and pressure relief mechanisms are provided on both sides of the first weld along the third direction, with the first direction, the second direction, and the third direction being perpendicular to each other.

[0028] When the battery device experiences thermal runaway or abnormal internal pressure rise, it can reduce the risk of excessive stress concentration on the weld due to pressure concentration on one side of the weld during pressure relief by the pressure relief mechanism, thereby improving the reliability of the battery device.

[0029] In some embodiments of the first aspect, at least one of the two opposite sides of the base plate along the first direction is provided with a recess, and at least a portion of the first weld is accommodated in the recess.

[0030] By introducing recesses and accommodating at least a portion of the weld within them, the risk of interference between the weld and the battery cells, leading to damage or failure of the pressure relief mechanism, can be reduced when the base plate deforms under impact, thereby further improving the reliability of the battery device. Additionally, the recesses also serve to release stress, reducing the risk of localized stress concentration on the base plate.

[0031] In some embodiments of the first aspect, the base plate has a cavity inside, and in the same plane perpendicular to the first direction, the orthographic projection of the cavity at least partially overlaps with the orthographic projection of the pressure relief mechanism.

[0032] When the battery device is subjected to external impact, the cavity can effectively absorb the external impact load and reduce the impact energy transmitted to the battery cells, thereby further reducing the risk of damage or failure of the pressure relief mechanism and thus further improving the reliability of the battery device.

[0033] In some embodiments of the first aspect, the housing further includes reinforcing ribs disposed within the cavity and connected between the two side surfaces of the base plate facing the cavity in the first direction.

[0034] The reinforcing ribs can at least provide support to the base plate along the first direction. When the base plate is subjected to external impact, they can at least reduce the amount of deformation of the base plate along the first direction, thereby further reducing the risk of damage or failure of the pressure relief mechanism caused by the deformation of the base plate squeezing the battery cells.

[0035] In some embodiments of the first aspect, the reinforcing rib includes a first end and a second end, the first end being connected to one of the two side surfaces of the base plate facing the cavity along a first direction, and the second end being connected to the other of the two side surfaces of the base plate facing the cavity along the first direction. The orthographic projections of the first end and the second end are spaced apart in the same plane perpendicular to the first direction.

[0036] When the battery device is subjected to external impact, the reinforcing ribs can provide support for the base plate along the first direction, significantly reducing the deformation of the base plate along the first direction. At the same time, due to the spacing between the first end and the second end in the projection, the reinforcing ribs can undergo controlled bending or deformation under impact load, realizing deformation energy absorption, thereby effectively dispersing and consuming part of the impact energy and reducing the impact intensity transmitted to the battery cells.

[0037] In some embodiments of the first aspect, the housing further includes a buffer element disposed within the cavity, the buffer element having an elastic modulus less than that of the base plate.

[0038] The buffer has a small elastic modulus and is relatively soft. When the battery device is subjected to external impact, the buffer can absorb the external impact load through deformation, reduce the impact energy transmitted to the inside of the battery device, further reduce the risk of damage or failure of the pressure relief mechanism, and thus further improve the reliability of the battery device.

[0039] In some embodiments of the first aspect, in the same plane perpendicular to the first direction, the area S1 of the orthographic projection of the first portion and the area S2 of the orthographic projection of the base plate satisfy the relationship: 0.002≤S1 / S2≤0.05.

[0040] Setting S1 / S2 to greater than or equal to 0.002 can improve the overall impact resistance of the bottom guard plate; setting S1 / S2 to less than or equal to 0.05 can reduce the overall manufacturing cost of the bottom guard plate.

[0041] Secondly, this application provides an electrical device that includes a battery device provided in any embodiment of the first aspect, the battery device being used to store or provide electrical energy.

[0042] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0043] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0044] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0045] Figure 2 This is a partial top view of a battery device provided in some embodiments of this application;

[0046] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along AA;

[0047] Figure 4 for Figure 3 A magnified schematic diagram of the local structure at point M;

[0048] Figure 5 for Figure 4 A schematic diagram of the exploded structure shown;

[0049] Figure 6 This is a partially exploded structural diagram of a battery device provided in some embodiments of this application.

[0050] The reference numerals in the detailed embodiments are as follows:

[0051] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor;

[0052] 10. Box body;

[0053] 11. Base plate; 11a. Third part; 11b. Fourth part; 111. First plate; 112. Second plate;

[0054] 12. Bottom guard plate; 121. First part; 1211. Main body of the plate; 1212. Reinforcing member; 12121. First reinforcing part; 12122. Second reinforcing part; 122. Second part;

[0055] 20. Receiving cavity; 30. Battery cell; 40. Pressure relief mechanism; 50. Welded part; 60. Cavity; 70. First weld; 80. Recess; 90. Hollow cavity; 100. Reinforcing rib;

[0056] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0057] 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 and completely 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.

[0058] 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 specification 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 specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0059] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0060] 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 connection 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.

[0061] 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.

[0062] 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.

[0063] In this application, "multiple" means two or more (including two).

[0064] In this application, the term "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0065] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0066] In the development of battery technology, how to balance the reliability and cost of battery devices is an ongoing research direction.

[0067] In related technologies, the pressure relief mechanism of a single battery cell is typically positioned towards the bottom of the battery pack. This bottom orientation helps prevent gas from directly impacting the electrode terminals or other electronic components located at the top of the battery pack, reducing the risk of impact from flames or airflow. However, the bottom of the battery pack often needs to withstand significant dynamic impacts such as gravel and bumps. If the pressure relief mechanism is subjected to external impact forces for a long period of time, it may cause false triggering or structural fatigue, affecting the reliability of the battery pack.

[0068] Currently, impact resistance is typically improved by increasing the overall thickness of the battery pack's bottom protective plate. However, this leads to increased weight and cost, affecting the battery's energy density. Another approach involves designing the bottom protective plate as a complex multi-layered honeycomb structure, but this is technically challenging and not conducive to mass production.

[0069] Based on the above considerations, this application designs a battery device, which includes a housing and battery cells. The housing has a receiving cavity and includes a bottom plate and a bottom protective plate. The bottom plate is disposed on one side of the receiving cavity along a first direction, and the bottom protective plate is disposed on the side of the bottom plate facing away from the receiving cavity. The battery cells are disposed in the receiving cavity and connected to the bottom plate. The battery cells are provided with a pressure relief mechanism facing the bottom plate. The bottom protective plate includes a first part and a second part, which are disposed and connected along a direction intersecting the first direction. The stiffness of the first part is greater than that of the second part. In the same plane perpendicular to the first direction, the orthographic projection of the first part at least partially overlaps with the orthographic projection of the pressure relief mechanism.

[0070] By designing the bottom protective plate in sections, a first section with higher rigidity is used in the area corresponding to the pressure relief mechanism, while a second section with relatively lower rigidity is used in other areas. When the battery device is subjected to external impact, the first section can provide key protection for the pressure relief mechanism, effectively reducing the risk of damage or failure of the pressure relief mechanism. At the same time, since the reinforcement is only applied to a local area of ​​the bottom protective plate, the increased cost caused by reinforcing the entire bottom protective plate is avoided. Therefore, both the reliability and cost of the battery device can be balanced.

[0071] The battery cells described in this application are applicable to battery devices and electrical equipment using battery devices. Electrical equipment can be devices that use battery devices as a power source or various energy storage systems that use battery devices as energy storage elements. Electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0072] For ease of explanation, the following embodiments use a vehicle as an example of electrical equipment.

[0073] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0074] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0075] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0076] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0077] In some embodiments, the battery device 2 may be an energy storage device.

[0078] Energy storage devices can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems, or temporary power supply systems. Energy storage devices can store electrical energy as needed and output it when appropriate. For example, energy storage devices can store electrical energy during off-peak hours and provide power to relevant users or electrical equipment during peak hours.

[0079] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0080] Figure 2 This is a partial top view of a battery device provided in some embodiments of this application. Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure along AA. Figure 4 for Figure 3 A magnified schematic diagram of the local structure at point M. Figure 5 for Figure 4 The diagram shows the exploded structure of the illustrated structure. Figure 6 This is a partially exploded structural diagram of a battery device provided in some embodiments of this application.

[0081] Continue to refer to Figures 2 to 6This application provides a battery device, which includes a housing 10 and a battery cell 30. The housing 10 has a receiving cavity 20 and includes a bottom plate 11 and a bottom protective plate 12. The bottom plate 11 is disposed on one side of the receiving cavity 20 along a first direction X, and the bottom protective plate 12 is disposed on the side of the bottom plate 11 facing away from the receiving cavity 20. The battery cell 30 is disposed in the receiving cavity 20 and connected to the bottom plate 11. The battery cell 30 is provided with a pressure relief mechanism 40, which faces the bottom plate 11. The bottom protective plate 12 includes a first part 121 and a second part 122, which are disposed and connected along a direction intersecting the first direction X. The stiffness of the first part 121 is greater than that of the second part 122. In the same plane perpendicular to the first direction X, the orthographic projection of the first part 121 at least partially overlaps with the orthographic projection of the pressure relief mechanism 40.

[0082] The battery device mentioned in the embodiments of this application may include one or more battery cell 30 assemblies for providing voltage and capacity. A battery cell 30 assembly may include multiple battery cells 30, which are connected in series, parallel, or mixed connections via a busbar.

[0083] As an example, a battery cell 30 assembly is typically formed by arranging multiple battery cells 30.

[0084] As an example, the battery cell 30 can be a lithium-ion battery cell 30, a sodium-ion battery cell 30, a sodium-lithium-ion battery cell 30, a lithium metal battery cell 30, a sodium metal battery cell 30, a lithium-sulfur battery cell 30, a magnesium-ion battery cell 30, a nickel-metal hydride battery cell 30, a nickel-cadmium battery cell 30, a lead-acid battery cell 30, etc.

[0085] As an example, the battery cell 30 assembly can be a battery module, which is formed by arranging and fixing multiple battery cells 30 together to form an independent module. As an example, a battery module can be formed by bundling multiple battery cells 30 together with cable ties.

[0086] As an example, the battery device can be a battery pack, which includes a housing 10 and one or more battery cell 30 assemblies, the battery cell 30 assemblies being housed in the housing 10.

[0087] As an example, the battery cell 30 assembly can be a battery module, and the battery cell 30 assembly can be housed in the housing 10 by fixing the battery module in the housing 10.

[0088] As an example, the battery cell 30 assembly can also be housed in the housing 10 by directly fixing multiple battery cells 30 to the housing 10.

[0089] As an example, the housing 10 may include a first housing section and a second housing section. The first housing section and the second housing section are fastened together to form a closed space inside the housing 10 to house the battery cell 30 assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing section may be a top cover or a bottom plate 11.

[0090] As an example, the housing 10 may include a top cover, a frame, and a bottom plate 11. The top cover and the bottom plate 11 are respectively connected to the frame, so that the interior of the housing 10 forms a closed space to accommodate the battery cell 30 assembly.

[0091] As an example, the housing 10 can be part of the vehicle's chassis structure. For instance, a portion of the housing 10 can be at least a part of the vehicle's floor, or a portion of the housing 10 can be at least a part of the vehicle's crossbeams and longitudinal beams.

[0092] The base plate 11 is used to support the battery cell 30. The base plate 11 refers to the wall panel located at the bottom of the housing 10, and it supports the battery cell 30. Specifically, the base plate 11 supports the battery cell 30 by providing a force that overcomes the weight of the battery cell 30. This can be achieved by the battery cell 30 directly contacting the base plate 11 or indirectly contacting it.

[0093] The bottom protective plate 12 is disposed on the side of the bottom plate 11 facing away from the receiving cavity 20 to protect the bottom plate 11.

[0094] The battery cell 30 is connected to the base plate 11. The battery cell 30 can be directly connected to the base plate 11, or it can be constrained to the base plate 11 by other components. As an example, the connection method between the battery cell 30 and the base plate 11 can be, but is not limited to, plugging or gluing.

[0095] Optionally, both the base plate 11 and the bottom guard plate 12 can be made of, but are not limited to, metallic or non-metallic materials. For example, metallic materials can be copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, or stainless steel, while non-metallic materials can be ceramic, polyethylene, polypropylene, polyvinyl chloride, polyimide, or polyamide, etc.

[0096] The pressure relief mechanism 40 is used to release the internal gas of the battery cell 30.

[0097] As an example, the internal pressure or temperature of the battery cell 30 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 30 reaches the predetermined threshold, the pressure relief mechanism 40 is activated or a weak structure in the pressure relief mechanism 40 is broken, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 30.

[0098] For example, the battery cell 30 includes a housing, and a pressure relief structure is disposed on the housing.

[0099] As an example, the pressure relief mechanism 40 can be integrally formed with the housing.

[0100] As an example, the pressure relief mechanism 40 can also be separately configured and connected to the housing.

[0101] The term "actuation" as used in this application refers to the pressure relief mechanism 40 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 30. The actions of the pressure relief mechanism 40 may include, but are not limited to: movement of components within the pressure relief mechanism 40 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 40, etc. When the pressure relief mechanism 40 is actuated, the high-temperature, high-pressure substances inside the battery cell 30 are discharged outwards from the actuated portion as waste. This method allows for pressure and temperature relief of the battery cell 30 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0102] In some examples, when the housing is a non-sealed structure, the pressure relief mechanism 40 can be configured as a through hole to release gas inside the battery cell 30.

[0103] The emissions from the battery cell 30 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0104] The pressure relief mechanism 40 faces the base plate 11, which helps to prevent gas from directly rushing towards the electrode terminals or other electronic devices located on top of the battery device, reducing the risk of impact from flames and airflow.

[0105] The stiffness of the first part 121 is greater than that of the second part 122. For example, the first part 121 and the second part 122 can be designed differently in terms of material, structural form or structural size, so that the stiffness of the first part 121 is greater than that of the second part 122.

[0106] In some examples, the first part 121 and the second part 122 are made of different materials. For instance, when the first part 121 and the second part 122 have the same structural shape and dimensions, the material of the first part 121 has a lower stiffness than the material of the second part 122, so that the stiffness of the first part 121 is greater than that of the second part 122. For example, the first part 121 is made of steel with relatively high stiffness, while the second part 122 is made of aluminum or an aluminum alloy with relatively low stiffness.

[0107] In other examples, the structural dimensions of the first part 121 and the second part 122 are different. For example, when the first part 121 and the second part 122 have the same structural shape and material, the thickness of the first part 121 is greater than the thickness of the second part 122. In other words, the dimension of the first part 121 along the first direction X is greater than the dimension of the second part 122 along the first direction X, so that the stiffness of the first part 121 is greater than the stiffness of the second part 122.

[0108] In some other examples, the first part 121 and the second part 122 have different structural forms. For example, when the first part 121 and the second part 122 have the same structural dimensions and materials, a reinforcing member is added to the first part 121. The reinforcing member is connected to at least one side of the first part 121 along the first direction X, so that the stiffness of the first part 121 is greater than that of the second part 122.

[0109] As an example, the stiffness of Part 121 and Part 122 can be tested with reference to the national standard GB / T228.1-2021 "Metallic materials - Tensile testing - Part 1: Test method at room temperature" or GB / T22159 "Acoustics and vibration - Laboratory measurement method for vibration-sound transmission characteristics of elastic elements".

[0110] In the same plane perpendicular to the first direction X, the orthographic projection of the first portion 121 at least partially overlaps with the orthographic projection of the pressure relief mechanism 40. In other words, the first portion 121 corresponds to the pressure relief mechanism 40, that is, the first portion 121 is the part of the bottom guard plate 12 corresponding to the pressure relief mechanism 40.

[0111] For example, in the same plane perpendicular to the first direction X, the orthographic projection of the first part 121 may overlap with a portion of the orthographic projection of the pressure relief mechanism 40, or the orthographic projection of the first part 121 may overlap with the orthographic projection of the pressure relief mechanism 40.

[0112] By designing the bottom protective plate 12 in sections, a first section 121 with higher rigidity is used for the area corresponding to the pressure relief mechanism 40, while a second section 122 with relatively lower rigidity is used in other areas. When the battery device is subjected to external impact, the first section 121 can provide key protection for the pressure relief mechanism 40, effectively reducing the risk of damage or failure of the pressure relief mechanism 40. At the same time, since the reinforcement is only applied to a local area of ​​the bottom protective plate 12, the increased cost caused by reinforcing the entire bottom protective plate 12 is avoided. Therefore, the reliability and cost of the battery device can be balanced.

[0113] In some embodiments, the weight of the second portion 122 is less than the weight of the first portion 121. By reinforcing a local area of ​​the bottom cover 12, the weight increase problem caused by reinforcing the entire bottom cover 12 is avoided, thus balancing the reliability, cost, and energy density of the battery device.

[0114] In some embodiments, the battery device further includes a heat exchange component for exchanging heat with the battery cell 30.

[0115] For example, the heat exchange component may be thermally connected (e.g., attached) to the battery cell 30, and the heat exchange medium flows within the heat exchange component and exchanges heat with the battery cell 30. When the temperature of the battery cell 30 is too high, the heat exchange component can cool the battery cell 30; when the temperature of the battery cell 30 is too low, the heat exchange component can keep the battery cell 30 warm, thereby improving the service life of the battery cell 30.

[0116] In some embodiments, the heat exchange component is disposed between the battery cell 30 and the base plate 11.

[0117] In some embodiments, the heat exchange component may also be configured as a base plate 11, which carries the battery cell 30.

[0118] In some embodiments, the dimension of the first portion 121 along the first direction X is greater than the dimension of the second portion 122 along the first direction X.

[0119] For example, the dimension of the first part 121 along the first direction X can be understood as the thickness of the first part 121, and the dimension of the second part 122 along the first direction X can be understood as the thickness of the second part 122.

[0120] By differentiating the structural dimensions of the first part 121 and the second part 122, the rigidity of the first part 121 can be increased by increasing its thickness, which can reduce processing complexity and help reduce costs.

[0121] In some embodiments, the first part 121 includes a plate body 1211 and a reinforcing member 1212, the reinforcing member 1212 being disposed and connected to the plate body 1211 along a first direction X.

[0122] The reinforcing member 1212 can be directly connected to the plate body 1211, or it can be constrained to the plate body 1211 by other components. As an example, the connection method between the reinforcing member 1212 and the plate body 1211 can be, but is not limited to, welding, bolting, riveting, plugging, or bonding.

[0123] The main body 1211 and the reinforcing member 1212 can be made of the same material or different materials.

[0124] As an example, the material of the reinforcing member 1212 can be high-strength steel.

[0125] Optionally, the reinforcing member 1212 may be, but is not limited to, a plate-like structure, a block-like structure, or a rib-like structure.

[0126] By adding a reinforcing member 1212 to the main body 1211 to improve the rigidity of the first part 121, not only is the manufacturing difficulty lower, but the reinforcing member 1212 can also be flexibly set according to different needs, thereby improving the overall design flexibility of the bottom protective plate 12.

[0127] In some embodiments, the reinforcing member 1212 is connected to the side of the plate body 1211 facing the base plate 11. In other words, the reinforcing member 1212 is connected to the inner side of the plate body 1211. This can improve the appearance consistency of the bottom cover plate 12, thereby improving the appearance quality of the battery device.

[0128] In some embodiments, the reinforcing member 1212 may also be connected to the side of the plate body 1211 facing away from the base plate 11. In other words, the reinforcing member 1212 is connected to the outside of the plate body 1211. This can reduce the space occupied by the reinforcing member 1212 inside the battery device.

[0129] In some embodiments, the second part 122 and the plate body 1211 are integrally formed.

[0130] On the one hand, the second part 122 is not connected to the main body 1211 through an additional connection process, which simplifies the manufacturing process. On the other hand, compared with connecting the second part 122 to the main body 1211 through an additional connection process, the integrated structure of the second part 122 and the main body 1211 has higher structural strength.

[0131] In some embodiments, the side surface of the second portion 122 facing the base plate 11 is flush with the side surface of the plate body 1211 facing the base plate 11.

[0132] In some embodiments, the side surface of the second portion 122 facing away from the base plate 11 is flush with the side surface of the plate body 1211 facing away from the base plate 11.

[0133] In some embodiments, the second part 122 and the plate body 1211 are different parts of a plate body.

[0134] In some embodiments, the reinforcing member 1212 includes a first reinforcing part 12121 and a second reinforcing part 12122. The second reinforcing part 12122 is connected between the first reinforcing part 12121 and the plate body 1211. The elastic modulus of the second reinforcing part 12122 is less than the elastic modulus of the first reinforcing part 12121.

[0135] The second reinforcing part 12122 has a smaller elastic modulus and a relatively soft texture. When the battery device is subjected to external impact, the second reinforcing part 12122 can form a deformation buffer between the first reinforcing part 12121 and the plate body 1211, absorb the external impact load, and reduce the impact energy transmitted to the inside of the battery device, so as to further reduce the risk of damage or failure of the pressure relief mechanism 40, thereby further improving the reliability of the battery device.

[0136] Optionally, the second reinforcing part 12122 may be made of, but is not limited to, materials such as resin, silicone, foam or rubber.

[0137] The structural shapes of the first reinforcing part 12121 and the second reinforcing part 12122 may be the same or different.

[0138] As an example, the first reinforcing part 12121 and the second reinforcing part 12122 have the same structural shape, which can improve the structural consistency of the reinforcing part 1212 and reduce the assembly difficulty.

[0139] As an example, the elastic modulus of the first reinforcing part 12121 and the second reinforcing part 12122 can be tested with reference to the national standard GB / T22315-2008 "Test Method for Elastic Modulus and Poisson's Ratio of Metallic Materials".

[0140] In some embodiments, the stiffness of the first reinforcing part 12121 is greater than the stiffness of the second reinforcing part 12122.

[0141] In some embodiments, the second reinforcing part 12122 includes an adhesive layer, and the first reinforcing part 12121 is bonded to the board body 1211 through the adhesive layer.

[0142] For example, a portion of the second reinforcing part 12122 may be an adhesive layer, or the entire second reinforcing part 12122 may be an adhesive layer.

[0143] The adhesive layer can form a deformation buffer between the first reinforcing part 12121 and the plate body 1211, and can also fix the first reinforcing part 12121 to the plate body 1211, which helps to reduce the structural complexity of the battery device and reduce costs.

[0144] In some embodiments, the first reinforcing portion 12121 is welded to the plate body 1211 to form a welded portion 50, and the welded portion 50 and the adhesive layer are disposed in a direction intersecting the first direction X. This can further improve the connection strength between the first reinforcing portion 12121 and the plate body 1211.

[0145] For example, the first reinforcing part 12121 and the plate body 1211 may be connected by, but is not limited to, ultrasonic welding or friction stir welding.

[0146] In some embodiments, the welding portion 50 and the adhesive layer are spaced apart along a direction intersecting the first direction X, which can reduce the risk of interference between the welding portion 50 and the adhesive layer, resulting in damage to the adhesive layer.

[0147] In some embodiments, the welded portion 50 is disposed around the adhesive layer. This can improve the uniformity of stress distribution on the first reinforcing portion 12121, reduce the risk of local stress concentration, and further improve the connection reliability of the first reinforcing portion 12121.

[0148] For example, the welding portion 50 may be annular, and the annular welding portion 50 is disposed around the adhesive layer; the welding portion 50 may also be provided in multiples, and the multiple welding portions 50 are disposed at intervals around the adhesive layer.

[0149] In some embodiments, there are multiple battery cells 30 and multiple first portions 121, with at least one first portion 121 corresponding to a pressure relief mechanism 40 of each of the multiple battery cells 30. This reduces the number of first portions 121, lowers processing complexity, and reduces costs.

[0150] In other words, in the same plane perpendicular to the first direction X, the orthographic projection of a first portion 121 overlaps with the orthographic projection of the pressure relief mechanism 40 of multiple battery cells 30.

[0151] In some embodiments, each first portion 121 is provided corresponding to the pressure relief mechanism 40 of a plurality of battery cells 30, which can further reduce the number of first portions 121.

[0152] In other words, in the same plane perpendicular to the first direction X, the orthographic projection of each first part 121 overlaps with the orthographic projection of the pressure relief mechanism 40 of the plurality of battery cells 30.

[0153] In some embodiments, there are multiple battery cells 30 and multiple first portions 121, with each first portion 121 corresponding to a pressure relief mechanism 40 of a multiple battery cell 30. This improves the flexibility of the arrangement of the first portions 121 and enhances the protection effect on the pressure relief mechanism 40.

[0154] In other words, in the same plane perpendicular to the first direction X, the orthographic projection of a first portion 121 at least partially overlaps with the orthographic projection of the pressure relief mechanism 40 of a battery cell 30.

[0155] It should be noted that in the embodiments of this application, "multiple" refers to two or more.

[0156] In some embodiments, a cavity 60 is provided between the bottom guard plate 12 and the bottom plate 11.

[0157] When the battery device is subjected to external impact, the cavity 60 can effectively absorb the external impact load and reduce the impact energy transmitted to the inside of the battery device, thereby further reducing the risk of damage or failure of the pressure relief mechanism 40 and thus further improving the reliability of the battery device.

[0158] In some embodiments, a cavity 60 is provided between the bottom protective plate 12 and the bottom plate 11, and a reinforcing member 1212 is disposed within the cavity 60. The cavity 60 can provide space for the reinforcing member 1212, reducing the difficulty of installing the reinforcing member 1212.

[0159] In some embodiments, the base plate 11 includes a third portion 11a and a fourth portion 11b, which are disposed and connected along a direction intersecting the first direction X. The stiffness of the third portion 11a is less than that of the fourth portion 11b, and the third portion 11a is disposed adjacent to the pressure relief mechanism 40. In the same plane perpendicular to the first direction X, the orthographic projection of the first portion 121 and the orthographic projection of the third portion 11a at least partially overlap.

[0160] For example, the third part 11a and the fourth part 11b can be understood as different areas on the base plate 11.

[0161] As an example, the third part 11a and the pressure relief mechanism 40 can be arranged adjacent to each other along the third direction Z, that is, in the same plane perpendicular to the first direction X, the orthographic projection of the third part 11a and the orthographic projection of the pressure relief mechanism 40 are arranged adjacent to each other along the third direction Z.

[0162] As an example, the third part 11a and the pressure relief mechanism 40 can also be arranged adjacent to each other along the first direction X, that is, in the same plane perpendicular to the first direction X, the orthographic projection of the third part 11a and the orthographic projection of the pressure relief mechanism 40 at least partially overlap along the first direction X.

[0163] As an example, the third part 11a and the pressure relief mechanism 40 can also be arranged adjacent to each other along the second direction Y, that is, in the same plane perpendicular to the first direction X, the orthographic projection of the third part 11a and the orthographic projection of the pressure relief mechanism 40 are arranged adjacent to each other along the second direction Y.

[0164] In the same plane perpendicular to the first direction X, the orthographic projection of the first part 121 may overlap with a portion of the orthographic projection of the third part 11a, or the orthographic projection of the first part 121 may overlap with the orthographic projection of the third part 11a.

[0165] During the fabrication of the base plate 11, areas with relatively low stiffness are often unavoidably formed due to process or design requirements. For example, during the welding process, the weld area is affected by welding thermal stress, leading to a decrease in the local microstructure and properties of the material, thereby reducing the stiffness of that area. Furthermore, to meet the structural adaptability requirements of the battery device, the base plate 11 may need to be locally thinned, perforated, or shaped; these special designs also weaken the deformation resistance of the relevant areas. The area with reduced stiffness due to the aforementioned process or design, adjacent to the pressure relief mechanism 40, can be defined as the third part 11a.

[0166] Because the third part 11a has low stiffness, it is more prone to deformation under external impact, causing the impact load to be transmitted to the adjacent pressure relief mechanism 40, thereby significantly increasing the risk of damage or failure of the pressure relief mechanism 40.

[0167] Thus, by setting the first part 121 to provide targeted protection for the third part 11a, the above technical solution can effectively reduce the risk of damage or failure of the pressure relief mechanism 40, thereby further improving the reliability of the battery device.

[0168] As an example, the stiffness of Part 3 11a and Part 4 11b can be tested with reference to the national standard GB / T228.1-2021 "Metallic materials, tensile testing - Part 1: Test method at room temperature" or GB / T22159 "Acoustics and vibration, laboratory measurement method for vibration-sound transmission characteristics of elastic elements".

[0169] In some embodiments, the base plate 11 includes a first plate body 111 and a second plate body 112, the first plate body 111 and the second plate body 112 are welded to form a first weld 70, and the third part 11a includes the first weld 70.

[0170] For example, the number of first plates 111 can be one or more, and the number of second plates 112 can be one or more. Here, "multiple" means two or more.

[0171] The base plate 11 of the above-mentioned technical solution is composed of multiple smaller plates (first plate 111 and second plate 112) welded together, which eliminates the need for direct processing of large-size plates during the manufacturing process, effectively reducing the difficulty and complexity of the preparation of the base plate 11. In addition, it can reduce the dependence on large equipment, improve material utilization, and reduce waste generation, thereby reducing costs while ensuring structural performance.

[0172] In some embodiments, the first plate 111 and the second plate 112 are welded by friction stir welding.

[0173] In some embodiments, the first weld 70 extends along the second direction Y, and pressure relief mechanisms 40 are provided on both sides of the first weld 70 along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0174] When the battery device experiences thermal runaway or abnormal internal pressure rise, it can reduce the risk of excessive stress concentration on the weld seam due to pressure concentration on one side of the weld seam during pressure relief by the pressure relief mechanism 40, thereby improving the reliability of the battery device.

[0175] In some embodiments, at least one of the opposite sides of the base plate 11 along the first direction X is provided with a recess 80, and at least a portion of the first weld 70 is accommodated in the recess 80.

[0176] For example, the first weld 70 may be partially or entirely contained within the recess 80.

[0177] As an example, the bottom plate 11 has a recess 80 on the side facing the bottom guard plate 12, and the recess 80 is recessed relative to the surface of the bottom plate 11 facing the bottom guard plate 12.

[0178] As another example, the bottom plate 11 has a recess 80 on the side facing away from the bottom guard plate 12, and the recess 80 is recessed relative to the surface of the bottom plate 11 facing away from the bottom guard plate 12.

[0179] As another example, the base plate 11 has recesses 80 on both sides opposite to each other along the first direction X.

[0180] By introducing the recess 80 and accommodating at least a portion of the weld within it, the risk of interference between the weld and the battery cell 30, leading to damage or failure of the pressure relief mechanism 40, can be reduced when the base plate 11 deforms under impact, thereby further improving the reliability of the battery device. Additionally, the recess 80 also serves to release stress, reducing the risk of localized stress concentration in the base plate 11.

[0181] In some embodiments, the base plate 11 has a cavity 90 inside, and in the same plane perpendicular to the first direction X, the orthographic projection of the cavity 90 at least partially overlaps with the orthographic projection of the pressure relief mechanism 40.

[0182] For example, in the same plane perpendicular to the first direction X, the orthographic projection of the cavity 90 may partially overlap with the orthographic projection of the pressure relief mechanism 40, or the orthographic projection of the cavity 90 may overlap with the orthographic projection of the pressure relief mechanism 40.

[0183] When the battery device is subjected to external impact, the cavity 90 can effectively absorb the external impact load and reduce the impact energy transmitted to the battery cell 30, thereby further reducing the risk of damage or failure of the pressure relief mechanism 40 and further improving the reliability of the battery device.

[0184] In some embodiments, the housing 10 further includes a reinforcing rib 100, which is disposed in the cavity 90 and connected between the two side surfaces of the base plate 11 facing the cavity 90 along the first direction X.

[0185] For example, the base plate 11 includes a first wall and a second wall, which are disposed opposite to each other along a first direction X, a cavity 90 is located between the first wall and the second wall, and a reinforcing rib 100 is connected between the first wall and the second wall.

[0186] The reinforcing rib 100 can at least provide support for the base plate 11 along the first direction X. When the base plate 11 is subjected to external impact, it can at least reduce the amount of deformation of the base plate 11 along the first direction X, thereby further reducing the risk of damage or failure of the pressure relief mechanism 40 caused by the deformation of the base plate 11 squeezing the battery cell 30.

[0187] In some embodiments, the reinforcing rib 100 includes a first end and a second end. The first end is connected to one of the two side surfaces of the base plate 11 facing the cavity 90 along the first direction X, and the second end is connected to the other side surface of the base plate 11 facing the cavity 90 along the first direction X. In the same plane perpendicular to the first direction X, the orthographic projections of the first end and the second end are spaced apart.

[0188] When the battery device is subjected to external impact, the reinforcing rib 100 can provide support for the base plate 11 along the first direction X, significantly reducing the deformation of the base plate 11 along the first direction X; at the same time, due to the spacing between the first end and the second end in the projection, the reinforcing rib 100 can undergo controlled bending or deformation under impact load, realizing deformation energy absorption, thereby effectively dispersing and consuming part of the impact energy and reducing the impact intensity transmitted to the battery cell 30.

[0189] Thus, the reinforcing rib 100 of the above technical solution not only plays a role in bearing and supporting, but also has the function of absorbing energy and buffering, which can effectively improve the reliability of the battery device.

[0190] For example, in the same plane perpendicular to the first direction X, the orthographic projections of the first end and the second end are set at intervals, which can be understood as the reinforcing rib 100 being set at an inclination relative to the plane where the base plate 11 is located.

[0191] In some embodiments, the reinforcing rib 100 is a plate-like structure, and the plane of the reinforcing rib 100 intersects with the plane of the base plate 11.

[0192] Of course, in some embodiments, the reinforcing rib 100 is a plate-like structure, and the plane where the reinforcing rib 100 is located may be perpendicular to the plane where the base plate 11 is located.

[0193] In some embodiments, the housing 10 further includes a buffer member disposed within the cavity 90, the buffer member having an elastic modulus less than that of the base plate 11.

[0194] The buffer has a small elastic modulus and is relatively soft. When the battery device is subjected to external impact, the buffer can absorb the external impact load through deformation, reduce the impact energy transmitted to the inside of the battery device, and further reduce the risk of damage or failure of the pressure relief mechanism 40, thereby further improving the reliability of the battery device.

[0195] Optionally, the cushioning element may be made of, but is not limited to, materials such as resin, silicone, foam, or rubber.

[0196] As an example, the elastic modulus of the buffer and the base plate 11 can be tested with reference to the national standard GB / T22315-2008 "Metallic Materials - Test Method for Elastic Modulus and Poisson's Ratio".

[0197] In some embodiments, in the same plane perpendicular to the first direction X, the area S1 of the orthographic projection of the first portion 121 and the area S2 of the orthographic projection of the base plate 11 satisfy the relationship: 0.002≤S1 / S2≤0.05.

[0198] As an example, S1 / S2 can be, but is not limited to, 0.002, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, etc.

[0199] By setting S1 / S2 to be greater than or equal to 0.002, the overall impact resistance of the bottom guard plate 12 can be improved; by setting S1 / S2 to be less than or equal to 0.05, the overall manufacturing cost of the bottom guard plate 12 can be reduced.

[0200] In some embodiments, 0.005 ≤ S1 / S2 ≤ 0.02 can further improve the balance between the reliability and cost of the battery device.

[0201] As an example, S1 / S2 can be, but is not limited to, 0.002, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, etc.

[0202] In some embodiments, the battery device further includes electrical components, and the housing 10 further includes an electrical compartment, which is spaced apart from the receiving cavity 20 along a direction intersecting the first direction X. At least a portion of the electrical components is disposed within the electrical compartment. In the same plane perpendicular to the first direction X, the orthographic projection of the electrical components at least partially overlaps with the orthographic projection of the first portion 121.

[0203] Part 121 provides key protection for electrical components, effectively reducing the risk of damage or failure of these components.

[0204] According to some embodiments of this application, this application also provides an electrical device, including a battery device of any of the above schemes, the battery device being used to store or provide electrical energy.

[0205] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. All technical features and optional technical features of this application can be combined to form new technical solutions.

[0206] To better understand the battery device provided in the embodiments of this application, based on the same inventive concept, an embodiment of the above-mentioned battery device in practical application is provided here for description.

[0207] This application provides a battery device, which includes a housing 10 and a battery cell 30. The housing 10 has a receiving cavity 20 and includes a bottom plate 11 and a bottom protective plate 12. The bottom plate 11 is disposed on one side of the receiving cavity 20 along a first direction X, and the bottom protective plate 12 is disposed on the side of the bottom plate 11 facing away from the receiving cavity 20. A cavity 60 is formed between the bottom protective plate 12 and the bottom plate 11.

[0208] The base plate 11 includes a third portion 11a and a fourth portion 11b, which are arranged and connected along a direction intersecting the first direction X. The stiffness of the third portion 11a is less than that of the fourth portion 11b. The third portion 11a is arranged adjacent to the pressure relief mechanism 40. In the same plane perpendicular to the first direction X, the orthographic projection of the first portion 121 and the orthographic projection of the third portion 11a at least partially overlap. The base plate 11 includes a first plate body 111 and a second plate body 112, which are welded together to form a first weld 70, which is configured as the third portion 11a.

[0209] A battery cell 30 is disposed in the receiving cavity 20 and connected to the base plate 11. The battery cell 30 is provided with a pressure relief mechanism 40, which faces the base plate 11. The bottom protective plate 12 includes a first part 121 and a second part 122. The first part 121 and the second part 122 are disposed and connected along a direction intersecting the first direction X. The stiffness of the first part 121 is greater than that of the second part 122. In the same plane perpendicular to the first direction X, the orthographic projection of the first part 121 and the orthographic projection of the pressure relief mechanism 40 at least partially overlap.

[0210] The first part 121 includes a main body 1211 and a reinforcing member 1212. The reinforcing member 1212 is connected to the side of the main body 1211 facing the base plate 11. The second part 122 is integrally formed with the main body 1211. The reinforcing member 1212 includes a first reinforcing part 12121 and a second reinforcing part 12122. The second reinforcing part 12122 is connected between the first reinforcing part 12121 and the main body 1211. The elastic modulus of the second reinforcing part 12122 is less than that of the first reinforcing part 12121. The second reinforcing part 12122 includes an adhesive layer. The first reinforcing part 12121 is bonded to the main body 1211 through the adhesive layer. The first reinforcing part 12121 is welded to the main body 1211 to form a welded part 50. The welded part 50 and the adhesive layer are arranged in a direction intersecting the first direction X.

[0211] By designing the bottom protective plate 12 in sections, a first section 121 with higher rigidity is used for the area corresponding to the pressure relief mechanism 40, while a second section 122 with relatively lower rigidity is used in other areas. When the battery device is subjected to external impact, the first section 121 can provide key protection for the pressure relief mechanism 40, effectively reducing the risk of damage or failure of the pressure relief mechanism 40. At the same time, since the reinforcement is only applied to a local area of ​​the bottom protective plate 12, the increased cost caused by reinforcing the entire bottom protective plate 12 is avoided. Therefore, the reliability and cost of the battery device can be balanced.

[0212] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0213] 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: A housing having a receiving cavity, the housing including a bottom plate and a bottom protective plate, the bottom plate being disposed on one side of the receiving cavity along a first direction, and the bottom protective plate being disposed on the side of the bottom plate facing away from the receiving cavity; A battery cell is disposed in the receiving cavity and connected to the base plate. The battery cell is provided with a pressure relief mechanism, which faces the base plate. The bottom protective plate includes a first part and a second part, which are arranged and connected along a direction intersecting the first direction. The stiffness of the first part is greater than that of the second part. The first part includes a plate body and a reinforcing member. The reinforcing member is arranged and connected to the plate body along the first direction. In the same plane perpendicular to the first direction, the orthographic projection of the reinforcing member overlaps at least partially with the orthographic projection of the pressure relief mechanism. The first part and the bottom plate are spaced apart along the first direction.

2. The battery device according to claim 1, characterized in that, The dimension of the first part along the first direction is greater than the dimension of the second part along the first direction.

3. The battery device according to claim 1, characterized in that, The reinforcing member is connected to the side of the plate body facing the bottom plate.

4. The battery device according to claim 1, characterized in that, The second part is integrally formed with the main body of the plate.

5. The battery device according to claim 1, characterized in that, The reinforcing member includes a first reinforcing part and a second reinforcing part, the second reinforcing part being connected between the first reinforcing part and the plate body, and the elastic modulus of the second reinforcing part being less than the elastic modulus of the first reinforcing part.

6. The battery device according to claim 5, characterized in that, The second reinforcing part includes an adhesive layer, and the first reinforcing part is bonded to the board body through the adhesive layer.

7. The battery device according to claim 6, characterized in that, The first reinforcing part is welded to the main body of the plate to form a welded part, and the welded part and the adhesive layer are arranged in a direction intersecting the first direction.

8. The battery device according to claim 7, characterized in that, The welded portion is arranged around the adhesive layer.

9. The battery device according to claim 1, characterized in that, The number of battery cells is multiple, and the number of the first part is multiple; At least one of the first portions is provided corresponding to the pressure relief mechanism of the plurality of battery cells, or the plurality of first portions are provided in a one-to-one correspondence with the pressure relief mechanism of the plurality of battery cells.

10. The battery device according to claim 1, characterized in that, There is a cavity between the bottom protective plate and the bottom plate.

11. The battery device according to claim 1, characterized in that, The base plate includes a third part and a fourth part, which are arranged and connected along a direction intersecting the first direction. The stiffness of the third part is less than that of the fourth part, and the third part is arranged adjacent to the pressure relief mechanism. In the same plane perpendicular to the first direction, the orthographic projection of the first part and the orthographic projection of the third part at least partially overlap.

12. The battery device according to claim 11, characterized in that, The base plate includes a first plate and a second plate, the first plate and the second plate are welded together to form a first weld, and the third part includes the first weld.

13. The battery device according to claim 12, characterized in that, The first weld extends along the second direction, and the pressure relief mechanism is provided on both sides of the first weld along the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

14. The battery device according to claim 12, characterized in that, At least one of the two opposite sides of the base plate along the first direction is provided with a recess, and at least a portion of the first weld is accommodated in the recess.

15. The battery device according to claim 1, characterized in that, The base plate has a cavity inside, and in the same plane perpendicular to the first direction, the orthographic projection of the cavity at least partially overlaps with the orthographic projection of the pressure relief mechanism.

16. The battery device according to claim 15, characterized in that, The housing also includes reinforcing ribs, which are disposed within the cavity and connected between the two side surfaces of the base plate facing the cavity along the first direction.

17. The battery device according to claim 16, characterized in that, The reinforcing rib includes a first end and a second end, the first end being connected to one of the two side surfaces of the base plate facing the cavity along the first direction, and the second end being connected to the other side surface of the base plate facing the cavity along the first direction. In the same plane perpendicular to the first direction, the orthographic projections of the first end and the second end are spaced apart.

18. The battery device according to claim 15, characterized in that, The housing also includes a buffer element disposed within the cavity, the buffer element having an elastic modulus less than that of the base plate.

19. The battery device according to any one of claims 1-18, characterized in that, In the same plane perpendicular to the first direction, the area S1 of the orthographic projection of the first part and the area S2 of the orthographic projection of the base plate satisfy the relationship: 0.002≤S1 / S2≤0.

05.

20. An electrical device, characterized in that, Includes the battery device as described in any one of claims 1-19, the battery device being used to store or provide electrical energy.

Images