Battery device and electric appliance

Abstract

The application discloses a battery device and an electric device. The battery device comprises a plurality of battery monomers and a box body, the battery monomers comprise a pressure relief mechanism; the box body comprises a supporting piece, a protective piece and a supporting piece, the supporting piece is provided with a first channel, the first channel forms a first opening on the supporting piece, the first opening is opposite to the pressure relief mechanism along a first direction; along the first direction, a pressure relief cavity is formed between the supporting piece and the protective piece, at least part of the supporting piece is arranged between the pressure relief mechanism and the protective piece, and the supporting piece is in contact with the supporting piece and the protective piece respectively, another part of the supporting piece is arranged between the pressure relief mechanism and the protective piece; the supporting piece is provided with a second channel, and the second channel is communicated with the pressure relief cavity and the first channel. The use reliability of the battery device is improved.

Description

Technical Field

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

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] In the development of battery technology, improving the reliability of battery devices is a key research direction. 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, embodiments of this application provide a battery device, including multiple battery cells and a housing. Each battery cell includes a pressure relief mechanism. The multiple battery cells are housed within the housing, which includes a support member, a protective member, and a supporting member. The multiple battery cells are disposed on one side of the support member along a first direction, and at least a portion of the protective member is disposed on the side of the support member away from the multiple battery cells, and the protective member is connected to the support member. The pressure relief mechanism is disposed at the end of the battery cell facing the support member. The support member has a first channel, and the first channel forms a first opening on the support member, which is opposite to the pressure relief mechanism along the first direction. A pressure relief cavity is formed between the support member and the protective member along the first direction. At least a portion of the supporting member is disposed between the pressure relief mechanism and the protective member, and the supporting member contacts both the support member and the protective member. Another portion of the supporting member is disposed between the pressure relief mechanism and the protective member. The supporting member has a second channel, which connects the pressure relief cavity and the first channel.

[0006] To vent the gas discharged from the pressure relief mechanism of the battery cell to the pressure relief chamber between the support and the protective component, a first channel is provided on the support to guide the gas. The first channel reduces the protective capability of the support for the pressure relief mechanism and even the battery cell. By providing a support, at least part of which is located between the pressure relief mechanism and the protective component, the protective capability for the pressure relief mechanism is improved. The support is in contact with the support and the protective component. When the protective component is impacted, the support absorbs energy through deformation and disperses the impact force to the support, thereby improving the strength and rigidity of the housing and enhancing the protective capability for the pressure relief mechanism and the battery cell, resulting in better stability of the battery device.

[0007] In some alternative embodiments, the support member includes a first support portion, a second support portion, and a connecting portion. The connecting portion is connected between the first support portion and the second support portion along a first direction. Along the first direction, at least a portion of the first support portion is placed between the support member and the protective member, and at least a portion of the second support portion is placed between the pressure relief mechanism and the protective member.

[0008] The first support is at least partially placed between the support member and the protective member, so that the first support and the support member and the protective member overlap, which increases the strength of the box. The second support is at least partially placed between the pressure relief mechanism and the protective member, so that the second support increases the protection strength of the pressure relief mechanism when the protective member is impacted.

[0009] In some optional embodiments, the connecting portion includes a first arm and a second arm disposed opposite to each other along a second direction, and a second support portion is connected between the first arm and the second arm. The first support portion includes a first sub-part and a second sub-part. The first sub-part and the second sub-part are respectively connected to the first arm and the second arm. Along the second direction, the first sub-part and the second sub-part are both placed between the first arm and the second arm to form a second opening. The second opening is disposed opposite to the second support portion, and the first direction and the second direction intersect.

[0010] By placing the first and second sub-parts on opposite sides of the first and second arms, the first and second sub-parts tend to move away from the second opening along the second direction after the support member is subjected to force. This facilitates buffering and allows the force to be transmitted circumferentially to the support member, reducing the force concentration on the second support part and improving the protection strength of the pressure relief mechanism.

[0011] In some alternative embodiments, the connecting portion includes a first arm and a second arm disposed opposite to each other along a second direction, and a second support portion is connected between the first arm and the second arm. The first support portion includes a first sub-part and a second sub-part. The first sub-part and the second sub-part are respectively connected to the first arm and the second arm. Along the second direction, the first sub-part and the second sub-part are placed on opposite sides of the first arm and the second arm to form a second opening. The second opening is disposed opposite to the second support portion, and the first direction and the second direction intersect.

[0012] By placing both the first and second sub-parts between the first and second arms, and with the first and second support parts facing each other, the material thickness in the first direction is increased, improving the rigidity of the housing. Furthermore, the first and second support parts antagonize each other, enhancing the impact resistance of the support components.

[0013] In some alternative embodiments, at least a portion of at least one of the first sub-part and the second sub-part protrudes toward the second support part to form a through channel; the first support part, the second support part and the connecting part enclose to form a buffer cavity, the through channel connects the buffer cavity and the pressure relief cavity, and the through channel is part of the second channel.

[0014] The first sub-part and / or the second sub-part protrudes into the second support to form a through channel, which facilitates the discharge of gas in the buffer chamber to the pressure relief chamber. The protruding structure also increases the rigidity of the support and the rigidity of the battery device.

[0015] In some alternative embodiments, the second support is connected to the protective member, the first support is connected to the support member, the second opening faces the pressure relief mechanism, and the second opening is part of the second channel.

[0016] The second opening faces the pressure relief mechanism to facilitate the discharge of gas from the second opening. After the protective component is subjected to force, the second support component transmits the force to the first support component through the connecting part, so that the force is dispersed circumferentially to the pressure relief mechanism and is subjected to force at other positions of the battery cell, thereby improving the protective effect of the pressure relief mechanism.

[0017] In some alternative embodiments, the second opening faces the protective member, the second support is connected to the support member, and the first support is connected to the protective member; the second support has a through hole, which is disposed opposite to the pressure relief mechanism, and the through hole is part of the second channel.

[0018] The first opening facing the protective plate provides deformation buffer space for the protective plate under stress, reducing excessive impact directly on the support and improving the protection effect on the pressure relief mechanism and even the battery cells.

[0019] In some alternative embodiments, at least one of the first arm and the second arm has a plurality of sub-holes communicating with the pressure relief chamber, and the plurality of sub-holes are spaced apart along a third direction.

[0020] By setting sub-holes on the connecting part, it is easy to smoothly discharge the gas from the first channel to the pressure relief chamber, and the structure is simple and easy to open.

[0021] In some alternative embodiments, the distance between the first arm and the second arm along the second direction tends to decrease from the first support portion towards the second support portion.

[0022] By observing the changing trend of the distance between the first and second arms, it is easier to disperse the impact force after being subjected to impact, thereby reducing the impact force on the support component along the first direction.

[0023] In some alternative embodiments, the support includes a support body and a buffer, the support body contacts the protective member through the buffer, and the second channel is disposed on the support body.

[0024] By installing a buffer between the support body and the protective component, the buffering capacity of the enclosure is improved, and the abnormal noise generated by the collision between the support body and the protective component is reduced.

[0025] In some alternative embodiments, the support extends along a third direction and is straight. By making the support straight, the distance between the protective member and the support member is shortened, which facilitates a reduction in the height and volume of the battery device and achieves lightweighting of the battery device.

[0026] In some alternative embodiments, the distance between the support and the protective element is less than or equal to 3 mm. This distance facilitates a reduction in the height and volume of the battery device, achieving weight reduction.

[0027] In some alternative embodiments, the elongation of the protective member is greater than that of the support member; and / or, the tensile strength of the support member is greater than that of the protective member.

[0028] The protective component has a greater elongation rate than the support component, making it less prone to breakage in the bottom ball impact test, thus ensuring the sealing of the battery device. The support component has a greater tensile strength than the protective component, ensuring the rigidity of the housing and improving the impact resistance of the battery device in the bottom ball impact test. This application provides an electrical device including the battery device described in the above embodiment.

[0029] In some alternative embodiments, the support member includes a first support plate and a second support plate stacked along a first direction, the second support plate being placed between the first support plate and the protective member, and an intermediate cavity being formed between the first support plate and the second support plate; the first support plate has a first opening, the second support plate has a third opening, the third opening is opposite to the first opening, and the first opening and the third opening are connected through the intermediate cavity to form a first channel.

[0030] By setting up a double-layer structure with an intermediate cavity in the support component, the strength of the housing is improved, and the buffering capacity of the support component is enhanced, which is more conducive to improving the stability of the battery device.

[0031] Secondly, some embodiments of this application also provide an electrical device, including the battery device described above. Attached Figure Description

[0032] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0033] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0034] Figure 2 Schematic diagram of a battery device provided for some embodiments of this application;

[0035] Figure 3 for Figure 2 The diagram shows the structure of a single battery cell assembly.

[0036] Figure 4 This is a schematic diagram of the structure of a single battery cell in some embodiments of this application;

[0037] Figure 5 This is an exploded view of the battery device in some embodiments of this application;

[0038] Figure 6 This is a top view of a battery device in some embodiments of this application;

[0039] Figure 7 for Figure 6 A sectional view along the AA direction;

[0040] Figure 8 for Figure 6 Another sectional view along the AA direction;

[0041] Figure 9 for Figure 6 Another sectional view along the AA direction;

[0042] Figure 10 for Figure 5 A partially enlarged view of a structure of a central support member;

[0043] Figure 11 This is a cross-sectional view of another structure of the support member of the battery device according to an embodiment of this application;

[0044] Figure 12 This is a cross-sectional view of another structure of the support member of the battery device according to an embodiment of this application;

[0045] Figure 13 This is a cross-sectional view of another structure of the support member of the battery device according to an embodiment of this application.

[0046] The accompanying drawings are not necessarily drawn to scale.

[0047] Explanation of reference numerals in the attached figures:

[0048] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing; 5b. Second housing; 6. Battery cell assembly; 7. Battery cell; 10. Electrode assembly; 20. Housing; 21. Shell; 22. End cap; 70. Pressure relief mechanism;

[0049] 50. Support component; 501. First sub-part; 502. Second sub-part; 503. First arm; 504. Second arm; 505. Second opening; 506. Buffer cavity; 507. Through channel; 508. Through hole; 509. Sub-hole; 53. First support part; 54. Connecting part; 55. Second support part; 56. Second channel;

[0050] 51. Support component; 510. First channel; 511. First opening; 512. Intermediate cavity; 513. Third opening; 514. First support plate; 515. Second support plate;

[0051] 52. Protective component; 520. Pressure relief chamber; 530. Support body; 531. Buffer component; Z, first direction; X, second direction; Y, third direction. 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 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.

[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 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.

[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" means two or more (including two).

[0059] Currently, judging from market trends, battery applications are becoming increasingly widespread. Batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of battery applications, market demand is also constantly increasing.

[0060] The battery assembly includes a housing and multiple battery cells housed within the housing. Each battery cell can be the smallest unit comprising the battery assembly. Each battery cell includes a pressure relief mechanism for releasing gas from within the cell through the housing in the event of thermal runaway.

[0061] To meet the requirement of venting the gas generated inside the battery cells, the enclosure needs to be equipped with a corresponding gas venting channel. This reduces the strength of the enclosure, decreases its protection of the battery cells, and thus affects the overall stability of the battery device.

[0062] In view of this, the present application provides a battery device and electrical equipment. By providing a support member between the protective member and the supporting member of the housing, at least a portion of the support member is opposite to the pressure relief mechanism. The support member is in contact with the protective member and the supporting member respectively. The support member increases the housing's protection against the pressure relief mechanism. After the housing is impacted, the support member increases the rigidity of the housing. The impact force is dispersed through the support member and transmitted to the protective member and even the individual battery cells, thereby improving the overall stability and impact resistance of the battery device.

[0063] The battery devices described in this application are applicable to electrical devices that use battery devices. Electrical devices 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 devices can be, but are 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.

[0064] For ease of explanation, the following embodiments use a vehicle equipped with electrical equipment as an example.

[0065] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] Figure 2 A schematic diagram of a battery device provided for some embodiments of this application.

[0070] In some embodiments, the battery device 2 may include one or more battery cell assemblies 6 for providing voltage and capacity.

[0071] Battery cell assembly 6 may include multiple battery cells ( Figure 2 (Not shown), multiple battery cells are connected in series, parallel, or mixed connection through a busbar. Mixed connection refers to multiple battery cells being connected in both series and parallel.

[0072] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0073] As an example, a single battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc.

[0074] As an example, a battery cell can be a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0075] In some embodiments, the battery device 2 may be a battery pack, which includes a housing 5 and one or more battery cell assemblies 6, with the battery cells housed within the housing 5. As an example, the battery cell assembly 6 may also be housed within the housing by directly fixing multiple battery cells to the housing.

[0076] In some embodiments, the housing 5 is used to house individual battery cells, and the housing 5 can have various structures.

[0077] In some embodiments, the housing 5 may include a first housing 5a and a second housing 5b. The first housing 5a and the second housing 5b are fastened together to form a closed space inside the housing 5 to house the battery cell assembly 6. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing may be a top cover or a bottom plate.

[0078] In some embodiments, the housing 5 may include a top cover, side beams, and a bottom plate. The top cover and bottom plate are respectively connected to the side beams, thereby forming an enclosed space inside the housing to accommodate the battery cell assembly 6. As an example, the side beams may include multiple side beams.

[0079] In some embodiments, the housing 5 may be part of the vehicle's chassis structure. For example, a portion of the housing 5 may be at least a portion of the vehicle's floor, or a portion of the housing 5 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0080] In some embodiments, the battery device 2 may be an energy storage device.

[0081] 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.

[0082] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0083] Figure 3 for Figure 2 The diagram shows the structure of the battery cell assembly 6.

[0084] In some embodiments, such as Figure 3 As shown, there are multiple battery cells 7, which are first connected in series, parallel, or in a mixed manner to form a battery cell assembly 6. The multiple battery cell assemblies 6 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the casing.

[0085] Multiple battery cells 7 in the battery cell assembly 6 can be electrically connected through a busbar to achieve parallel, series, or mixed connection of the multiple battery cells 7 in the battery cell assembly 6. There can be one or more busbars, and each busbar is used to electrically connect at least two battery cells 7.

[0086] Figure 4 This is a schematic diagram of the structure of a battery cell in some embodiments of this application.

[0087] Reference Figure 4 This application provides a battery cell 7, which includes a housing 20 and an electrode assembly 10 housed within the housing 20.

[0088] In some embodiments, the outer casing 20 may be a steel casing, an aluminum casing, or a composite metal casing (such as a copper-aluminum composite casing).

[0089] The outer shell 20 may be a hollow structure, with an internal cavity for accommodating the electrode assembly 10 and the electrolyte.

[0090] In some embodiments, the casing 20 of the battery cell 7 is a cylindrical casing, a square casing, a prismatic casing, or a casing of other shapes.

[0091] In some embodiments, the housing 20 includes a housing 21 and an end cap 22, the housing 21 having an opening, and the end cap 22 being connected to the housing 21 and covering the opening;

[0092] The housing 21 is a component used to fit the end cap 22 to form the internal cavity of the battery cell 7. The formed internal cavity can be used to accommodate the electrode assembly 10, the electrolyte, and other components.

[0093] The housing 21 and the end cap 22 can be separate components. For example, an opening can be provided on the housing 21, and the end cap 22 can be used to close the opening to form an internal cavity for the battery cell 7.

[0094] The housing 21 can be of various shapes and sizes, such as cuboid or cylindrical. Specifically, the shape of the housing 21 can be determined according to the specific shape and size of the electrode assembly 10. The housing 21 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0095] The shape of the end cap 22 can be adapted to the shape of the housing 21 to fit the housing 21. The material of the end cap 22 can be the same as or different from the material of the housing 21. Optionally, the end cap 22 can be made of a material with a certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.), so that the end cap 22 is not easily deformed when subjected to compression and impact, so that the battery cell 7 can have higher structural strength and improve reliability.

[0096] The end cap 22 is connected to the housing 21 by welding, bonding, snap-fitting or other means.

[0097] The housing 21 may be open at one end or open at both ends. In some examples, the housing 21 may be a structure with an opening on one side, and one end cap 22 is provided to cover the housing 21. In other examples, the housing 21 may also be a structure with openings on both sides, and two end caps 22 are provided, with the two end caps 22 respectively covering the two openings of the housing 21.

[0098] Electrode assembly 10 is a component in the battery cell 7 where electrochemical reactions occur. The housing 21 may contain one or more electrode assemblies 10.

[0099] In some embodiments, the electrode assembly 10 includes a positive electrode, a negative electrode, and a separator, wherein the positive electrode and the negative electrode have opposite polarities, and the separator separates the positive electrode and the negative electrode.

[0100] At least a portion of the separator is located between the positive and negative electrode plates. During the charging and discharging process of the battery cell 7, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrode plates. The separator, positioned between the positive and negative electrode plates, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through. In some embodiments, the electrode assembly 10 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked layers.

[0101] In some embodiments, the electrode assembly 10 is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0102] In some embodiments, the electrode assembly 10 has a stacked structure.

[0103] In some embodiments, the battery cell 7 further includes a pressure relief mechanism 70. The pressure relief mechanism 70 has a significant impact on the reliability of the battery cell 7. For example, when a short circuit or overcharging occurs, thermal runaway may occur inside the battery cell, causing a sudden increase in pressure. In this case, the pressure relief mechanism can be activated to release the internal pressure to the outside, thereby reducing the risk of battery cell explosion and fire.

[0104] For example, the pressure relief mechanism 70 refers to a component or part that is actuated to release internal gas when the internal pressure or temperature of a battery cell reaches a predetermined threshold. This threshold design varies depending on 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 7.

[0105] The pressure relief mechanism 70 can take the form of an explosion-proof valve, a gas valve, a pressure relief valve, or a safety valve, and can specifically employ a pressure-sensitive element or structure. That is, when the internal pressure of the battery cell 7 reaches a predetermined threshold, the pressure relief mechanism actuates or a weak area provided in the pressure relief mechanism ruptures, thereby forming an opening or channel for internal pressure release. Alternatively, the pressure relief mechanism 70 can also employ a temperature-sensitive element or structure, that is, when the internal temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism 70 actuates, thereby forming an opening or channel for internal pressure release.

[0106] When a battery cell 7 experiences thermal runaway, the emissions from the battery cell include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0107] In some embodiments, the pressure relief mechanism 70 is disposed on the housing 20. Exemplarily, the pressure relief mechanism 70 may be disposed on the housing 21 or on the end cap 22.

[0108] Figure 5 This is an exploded view of the battery device 2 in some embodiments of this application; Figure 6 This is a top view of the battery device 2 in some embodiments of this application; Figure 7 for Figure 6 A cross-sectional view along the AA direction.

[0109] like Figures 4 to 7As shown, some embodiments of this application provide a battery device 2 including a plurality of battery cells 7 and a housing 5. Each battery cell 7 includes a pressure relief mechanism 70. The plurality of battery cells 7 are housed within the housing 5. The housing 5 includes a support member 51, a protective member 52, and a supporting member 50. The plurality of battery cells 7 are disposed on one side of the support member 51 along a first direction Z. At least a portion of the protective member 52 is disposed on the side of the support member 51 away from the plurality of battery cells 7, and the protective member 52 is connected to the support member 51. The pressure relief mechanism 70 is disposed on the side of the battery cells 7 facing the support member 51. At one end, the support member 51 is provided with a first channel 510, and the first channel 510 forms a first opening 511 on the support member 51. The first opening 511 is opposite to the pressure relief mechanism 70 along the first direction Z. Along the first direction Z, a pressure relief cavity 520 is formed between the support member 51 and the protective member 52. At least a portion of the support member 50 is disposed between the pressure relief mechanism 70 and the protective member 52, and the support member 50 is in contact with the support member 51 and the protective member 52 respectively. The support member 50 is provided with a second channel 56, and the second channel 56 connects the pressure relief cavity 520 and the first channel 510.

[0110] The first direction Z can be the height, width, or length of the housing 5. For example, the pressure relief mechanism 70 is located at one end of the battery cell 7 along the first direction Z.

[0111] For example, the support 51 may be located at the bottom, top or side wall of the housing 5.

[0112] For example, the protective member 52 may be wholly or partially disposed on the side of the support member 51 opposite to the battery cell 7. In some examples, the protective member 52 may be in the form of a flat plate, a U-shaped plate, a recess, or other simple or complex structural shapes.

[0113] By way of example, the support member 51 and the protective member 52 can be directly connected, or the support member 51 can be connected to the protective member 52 through other parts of the housing 5. In some examples, the support member 51 and the protective member 52 can be an integrally formed structure, a separate fixed connection structure, or a separate detachable structure.

[0114] In some examples, the battery cell 7 may be in contact with or spaced from the support 51. In some examples, the battery cell 7 may be fixedly connected to or detachably connected to the support 51.

[0115] The pressure relief mechanism 70 is located at the end of the battery cell 7 near the support member 51. Exemplarily, in the event of thermal runaway of the battery cell 7, the pressure relief mechanism 70 releases gas toward the side where the support member 51 is located.

[0116] The first channel 510 refers to a connected space. For example, the first channel 510 can be a hole, groove, pipe, cavity or through structure, for allowing the gas discharged by the pressure relief mechanism 70 to flow into the pressure relief chamber 520 along the first channel 510.

[0117] For example, the support 51 may include one or more layers of structure. In some examples, the support 51 is a single layer, and the first channel 510 may be a hole penetrating the support 51 along a first direction Z.

[0118] In one example, the first channel 510 has a first opening 511 on the surface of the support 51 near the pressure relief mechanism 70, and a third opening 513 on the surface of the support 51 away from the pressure relief mechanism 70, with the first opening 511 and the third opening 513 connected.

[0119] For example, the first channel 510 extends along the first direction Z. In some examples, the axis of the first channel 510 may be parallel to or at an angle to the first direction Z in a cross section passing through the axis of the first channel 510.

[0120] In some examples, the first opening 511 can be a simple shape such as a circle, rectangle, or pentagon, or a complex shape composed of simple shapes.

[0121] In other examples, the first opening 511 can be one or more.

[0122] In some examples, the orthographic projection of the pressure relief mechanism 70 along the first direction Z onto the support 51 is wholly or partially coincided with the orthographic projection of the first opening 511 onto the support 51.

[0123] Along the first direction Z, there is a gap between the support member 51 and the protective member 52. For example, the support member 51 and the protective member 52 enclose to form a pressure relief cavity 520, or the support member 51, the protective member 52, and other parts of the housing 5 enclose to form a pressure relief cavity 520.

[0124] The orthographic projection of the pressure relief mechanism 70 along the first direction Z on the protective member 52 at least partially overlaps with the orthographic projection of the support member 50 on the protective member 52.

[0125] In some examples, the central portion of the support member 50 is disposed between the pressure relief mechanism 70 and the protective member 52, and the support member 50 is positioned between the support member 51 and the protective member 52 along a circumferential region of the central portion or on opposite sides of the central portion. In one example, at least a portion of the support member 50 is disposed within the pressure relief chamber 520, with the central portion of the support member 50 opposite to the first opening 511, and the circumferential region of the support member 50 opposite to the support member 51.

[0126] In other examples, the support is placed entirely between the pressure relief mechanism 70 and the protective element 52.

[0127] For example, the contact between the support member 51 and the support member 50 may include the connection or surface contact between the support member 51 and the support member 50. In some examples, the connection between the support member 51 and the support member 50 may be an integrally formed structure, a separate fixed connection structure, or a separate detachable structure.

[0128] For example, the contact between the protective member 52 and the support member 50 may include the connection between the protective member 52 and the support member 50 or surface contact. In some examples, the connection between the protective member 52 and the support member 50 may be an integrally formed structure, a separate fixed connection structure, or a separate detachable structure.

[0129] The materials of the support member 51, the protective member 52, and the support member 50 may be the same or different. For example, the materials of the support member 51 and the protective member 52 may be the same, while the material of the support member 50 may be different from both; or, the materials of the support member 51, the protective member 52, and the support member 50 may all be the same.

[0130] As an example, the material of the support and protective member 52 can be stainless steel, and the material of the support member 50 can be aluminum.

[0131] The second channel 56 refers to a connected space. For example, the second channel 56 can be a hole, groove, pipe, cavity, or through structure.

[0132] For example, the support member 50 can be a combination of one or more members. In some examples, the cross-section of the support member 50 can be a regular or irregular shape such as a solid rectangle, a hollow rectangle, a U-shape with an opening, or an inverted U-shape.

[0133] As an example, the support member 50 extends along the second direction X, which can be perpendicular to the first direction Z. The first direction Z is the height direction of the box 5, and the second direction X can be the length direction or the width direction of the box 5.

[0134] For example, multiple support members 50 are spaced apart along the second direction X, or are stacked between the protective member 52 and the support member 51.

[0135] In the embodiments of this application, in order to discharge the gas emitted by the pressure relief mechanism 70 of the battery cell 7 into the pressure relief cavity 520 between the support member 51 and the protective member 52, a first channel 510 is provided on the support member 51 to guide the gas. The provision of the first channel 510 reduces the protective capability of the support member 51 against the pressure relief mechanism 70 and even the battery cell 7. By providing a support member 50, at least a portion of the support member 50 is disposed between the pressure relief mechanism 70 and the protective member 52, thereby improving the protective capability against the pressure relief mechanism 70. The support member 50 is in contact with the support member 51 and the protective member 52. When the protective member 52 is impacted, the support member 50 absorbs energy through deformation and disperses the impact force onto the support member 51, thereby improving the strength and rigidity of the housing 5 and improving the protective capability against the pressure relief mechanism 70 and the battery cell 7, thus making the battery device 2 more stable.

[0136] In some embodiments of this application, the support member 50 includes a first support portion 53, a second support portion 55, and a connecting portion 54. The connecting portion 54 is connected between the first support portion 53 and the second support portion 55 along a first direction Z. Along the first direction Z, at least part of the first support portion 53 is placed between the support member 51 and the protective member 52, and at least part of the second support portion 55 is placed between the pressure relief mechanism 70 and the protective member 52.

[0137] For example, the support member 50 is a one-piece molded structure or a split connection structure.

[0138] For example, the first support portion 53 and the second support portion 55 are located at both ends of the support member 50 along the first direction Z, and the connecting portion 54 connects the first support portion 53 and the second support portion 55. For example, the connecting portion 54 has a length extending along the first direction Z, and the connecting portion 54 can be parallel to or at an angle to the first direction Z.

[0139] In some examples, the first support 53 is placed within the pressure relief chamber 520, and the first support 53 can contact one of the support member 51 and the protective member 52. As an example, the first support 53 is connected to the circumferential support member 51 of the first channel 510.

[0140] In other examples, the orthographic projection of the first support 53 on the protective member 52 may partially or completely overlap with the orthographic projection of the support member 51 on the protective member 52.

[0141] In some examples, the second support 55 is placed inside the pressure relief chamber 520, and the second support 55 can contact the other of the support member 51 and the protective member 52.

[0142] In other examples, the orthographic projection of the second support 55 onto the protective member 52 may partially or completely overlap with the orthographic projection of the pressure relief mechanism 70 onto the protective member 52.

[0143] For example, the first support portion 53 and the second support portion 55 can be a single layer or multiple layers.

[0144] In the embodiments of this application, the first support 53 is at least partially placed between the support member 51 and the protective member 52, so that the first support 53 overlaps with the support member 51 and the protective member 52, thereby increasing the strength of the box 5. The second support 55 is at least partially placed between the pressure relief mechanism 70 and the protective member 52, thereby increasing the protective strength of the pressure relief mechanism 70 when the protective member 52 is impacted.

[0145] Figure 8 for Figure 6 Another sectional view along the AA direction.

[0146] like Figures 4 to 8 As shown, in some embodiments of this application, the connecting portion 54 includes a first arm 503 and a second arm 504 disposed opposite to each other along the second direction X, and a second support portion 55 is connected between the first arm 503 and the second arm 504. The first support portion 53 includes a first sub-portion 501 and a second sub-portion 502. The first sub-portion 501 and the second sub-portion 502 are respectively connected to the first arm 503 and the second arm 504. Along the second direction X, the first sub-portion 501 and the second sub-portion 502 are placed on opposite sides of the first arm 503 and the second arm 504 to form a second opening 505. The second opening 505 is disposed opposite to the second support portion 55, and the first direction Z and the second direction X intersect.

[0147] For example, the second direction X can be perpendicular to the first direction Z. As an example, the first direction Z is the height direction of the box 5, and the second direction X is the length or width direction of the box 5.

[0148] The first arm 503 and the second arm 504 are positioned on opposite sides of the second support portion 55 along a second direction X. Exemplarily, the second support portion 55 may be bonded, welded, or integrally formed with the first arm 503 and the second arm 504. In one example, the second support portion 55 is connected to the end of the connecting portion 54 facing away from the first support portion 53.

[0149] For example, the first sub-part 501, the second sub-part 502 and the connecting part 54 are bonded, welded or integrally formed.

[0150] In some examples, the first sub-part 501 is connected to the end of the first arm 503 facing away from the second support part 55, and along the second direction X, the first sub-part 501 is positioned on the side of the first arm 503 facing away from the second arm 504.

[0151] In another example, the second sub-part 502 is connected to one end of the second arm 504 facing away from the second support part 55, and along the second direction X, the second sub-part 502 is positioned on the side of the second arm 504 facing away from the first arm 503.

[0152] For example, the first arm 503 and the second arm 504 are arranged to extend along a third direction Y, and the first direction Z, the second direction X and the third direction Y intersect each other.

[0153] Exemplarily, the second opening 505 of the support 50 may be provided to extend in a third direction Y. In some examples, the second opening 505 may face the pressure relief mechanism 70 or the protective member 52. The second opening 505 may be part of the second channel 56. In one example, the second opening 505 is positioned opposite the second support 55 such that the orthographic projection of the second opening 505 onto the protective member 52 at least partially coincides with the orthographic projection of the second support 55 onto the protective member 52.

[0154] In the embodiments of this application, by placing the first sub-part 501 and the second sub-part 502 on the opposite sides of the first arm 503 and the second arm 504, after the support member 50 is subjected to force, the first sub-part 501 and the second sub-part 502 tend to move away from the second opening 505 along the second direction X, which is beneficial for buffering, and the force can be transmitted to the circumference of the support member 50, reducing the force from being too concentrated on the second support part 55 and improving the protection strength of the pressure relief mechanism 70.

[0155] Furthermore, in one embodiment of this application, the second support 55 is connected to the protective member 52, the first support 53 is connected to the support member 51, the second opening 505 faces the pressure relief mechanism 70, and the second opening 505 is part of the second channel 56.

[0156] In one example, the second support portion 55 is fixedly connected to or detachably connected to the protective member 52. As an example, the second support portion 55 may include a second support body and a buffer member that abut against each other, the second support body being connected to the connecting portion 54, and the buffer member being bonded to the protective member 52.

[0157] In another example, the first support 53 is either fixedly connected to or detachably connected to the support member 51.

[0158] For example, the second opening 505 communicates with the first channel 510. The gas discharged by the pressure relief mechanism 70 enters the buffer cavity 506 of the support member 50 through the first channel 510 and the second opening 505, and is discharged to the pressure relief cavity 520 through other structures of the second channel 56. As an example, the first support portion 53, the second support portion 55 and the connecting portion 54 enclose and form the buffer cavity 506.

[0159] In the embodiments of this application, the second opening 505 faces the pressure relief mechanism 70 to facilitate the discharge of gas from the second opening 505, and after the protective member 52 is subjected to force, the second support member 50 transmits the force to the first support member 53 through the connecting part 54, so that the force is dispersed circumferentially to the pressure relief mechanism 70 and subjected to force at other positions of the battery cell 7, thereby improving the protective effect on the pressure relief mechanism 70.

[0160] Figure 9 for Figure 6 Another sectional view along the AA direction.

[0161] like Figures 4 to 9 As shown, in some embodiments of this application, the second opening 505 faces the protective member 52, the second support 55 is connected to the support member 51, and the first support 53 is connected to the protective member 52; the second support 55 has a through hole 508, which is disposed opposite to the pressure relief mechanism 70, and the through hole 508 is part of the second channel 56.

[0162] For example, a portion of the second support 55 along the second direction X is opposite to the pressure relief mechanism 70, and another portion is opposite to the support member 51.

[0163] In some examples, the second support 55 may be fixedly connected to or detachably connected to the support member 51.

[0164] In other examples, the first support portion 53 may be fixedly connected to or detachably connected to the protective member 52. As an example, the first support portion 53 may include a first support body and a buffer member that abut against each other, the first support body being connected to the connecting portion 54, and the buffer member being bonded to the protective member 52.

[0165] In some examples, the support member 50 extends along the third direction Y, and the second channel 56 has multiple through holes 508, which are spaced apart along the third direction Y and are connected to the buffer cavity 506.

[0166] For example, the through hole 508 communicates with the first channel 510. The gas discharged by the pressure relief mechanism 70 enters the buffer cavity 506 of the support member 50 through the through hole 508 via the first channel 510, and is discharged to the pressure relief cavity 520 via other structures of the second channel 56. As an example, the first support portion 53, the second support portion 55 and the connecting portion 54 enclose and form the buffer cavity 506.

[0167] In the embodiments of this application, the first opening 511 faces the protective plate, providing deformation buffer space for the protective plate to withstand the force, reducing excessive impact directly acting on the support member 50, and improving the protection effect on the pressure relief mechanism 70 and even the battery cell 7.

[0168] Figure 10 for Figure 5 A partially enlarged view of one structure of the central support member 50.

[0169] like Figures 5 to 10 As shown, in some examples of this application, at least a portion of at least one of the first sub-part 501 and the second sub-part 502 protrudes toward the second support part 55 to form a through channel 507; the first support part 53, the second support part 55 and the connecting part 54 enclose to form a buffer cavity 506, the through channel 507 connects the pressure relief cavity 520 and the buffer cavity 506, and the through channel 507 is part of the second channel 56.

[0170] For example, the first sub-part 501 or the first sub-part 502 is provided with a through channel 507, or both the first sub-part 501 and the second sub-part 502 are provided with a through channel 507.

[0171] In some examples, the first sub-part 501 includes multiple sub-part bodies and multiple protrusions. Along a third direction Y, the protrusions connect adjacent sub-part bodies, forming a through channel 507. The sub-part bodies are used to connect the portion 54 to the protective member 52 or the support member 51. As an example, the sub-part body includes a sub-plate and a buffer member. The third direction Y intersects the second direction X and the first direction Z in pairs. Exemplarily, the third direction Y is perpendicular to the second direction X and the first direction Z. As an example, the first direction Z is the height direction of the housing 5, the second direction X is the width direction of the housing 5, and the third direction Y is the length direction of the housing 5.

[0172] In one example, the second channel 56 includes a communicating second opening 505, a buffer chamber 506, and a through channel 507, with the second opening 505 facing the pressure relief mechanism 70. Gas enters the buffer chamber 506 through the second opening 505 and is discharged to the pressure relief chamber 520 through the through channel 507.

[0173] In another example, the second channel 56 includes a through hole 508, a buffer chamber 506, and a through channel 507, with a second opening 505 facing the protective member 52. Gas enters the buffer chamber 506 through the through hole 508 and is discharged to the pressure relief chamber 520 through the through channel 507.

[0174] In the embodiments of this application, the first sub-part 501 and / or the second sub-part 502 protrude toward the second support part 55 to form a through channel 507, which facilitates the discharge of gas in the buffer chamber 506 to the pressure relief chamber 520. The protruding structure also improves the rigidity of the support member 50 and the rigidity of the battery device 2.

[0175] In the embodiments of this application, at least one of the first arm 503 and the second arm 504 is provided with a plurality of sub-holes 509 along the second direction X, and the plurality of sub-holes 509 are spaced apart along the third direction Y.

[0176] In some examples, the sub-hole 509 is formed in the first arm 503 or the second arm 504, or in both the first arm 503 and the second arm 504. Exemplarily, the cross-section of the sub-hole 509 can be a simple or complex shape such as a circle, an ellipse, or a rectangle.

[0177] For example, the sub-hole 509 extends through the thickness of the first arm 503 or the second arm 504, connecting the buffer cavity 506 and the pressure relief cavity 520.

[0178] In some examples, the sub-hole 509 is formed on the support 50 simultaneously with the through channel 507 or is formed separately on the support 50. The sub-hole 509 can be part of the second channel 56.

[0179] In the embodiments of this application, by providing a sub-hole 509 on the connecting part 54, the gas in the first channel 510 is smoothly discharged to the pressure relief chamber 520, and the structure is simple and easy to open.

[0180] In some embodiments of this application, the distance between the first arm 503 and the second arm 504 along the second direction X tends to decrease from the first support portion 53 to the second support portion 55.

[0181] For example, along the second direction X, the distance between the end of the first arm 503 and the second arm 504 connected to the first support portion 53 is greater than the distance between the end of the first arm 503 and the second arm 504 connected to the second connecting portion 54.

[0182] In one example, there is a gap between the first arm 503 and the second arm 504 in the orthographic projection of the protective member 52 and the second support 55 in the orthographic projection of the protective member 52.

[0183] In another example, the second opening 505 faces the pressure relief mechanism 70.

[0184] In the embodiments of this application, the changing trend of the distance between the first arm 503 and the second arm 504 facilitates the dispersion of impact force after being subjected to impact force, thereby reducing the impact force on the support member 51 along the first direction Z.

[0185] Figure 11 This is a cross-sectional view of another structure of the support member 50 of the battery device 2 according to an embodiment of this application.

[0186] like Figures 5 to 11As shown, in some embodiments of this application, the connecting portion 54 includes a first arm 503 and a second arm 504 disposed opposite to each other along the second direction X, and a second support portion 55 is connected between the first arm 503 and the second arm 504. The first support portion 53 includes a first sub-portion 501 and a second sub-portion 502. The first sub-portion 501 and the second sub-portion 502 are respectively connected to the first arm 503 and the second arm 504. Along the second direction X, the first sub-portion 501 and the second sub-portion 502 are both placed between the first arm 503 and the second arm 504 to form a second opening 505. The second opening 505 is disposed opposite to the second support portion 55, and the first direction Z and the second direction X intersect.

[0187] For example, a second opening 505 is formed between the first sub-part 501 and the second sub-part 502.

[0188] In some examples, the second opening 505 faces the pressure relief mechanism 70 or the protective element 52.

[0189] In another example, the distance between the first arm 503 and the second arm 504 along the second direction X has a tendency to decrease from the first support portion 53 toward the second support portion 55.

[0190] In another example, the distance between the first arm 503 and the second arm 504 along the second direction X tends to increase from the first support 53 toward the second support 55.

[0191] In the embodiments of this application, by placing the first sub-part 501 and the second sub-part 502 between the first arm 503 and the second arm 504, and by having the first support part 53 and the second support part 55 opposite to each other, the material thickness in the first direction Z is increased, the rigidity of the box 5 is improved, and the first support part 53 and the second support part 55 antagonize each other, thereby improving the impact resistance of the support member 50.

[0192] Figure 12 This is a cross-sectional view of another structure of the support member 50 of the battery device 2 according to an embodiment of this application.

[0193] like Figures 5 to 12 As shown, in an optional embodiment of this application, the support 50 includes a support body 530 and a buffer 531. The support body 530 contacts the protective member 52 through the buffer 531, and the second channel 56 is disposed on the support body 530.

[0194] For example, the support body 530 includes a first support portion 53, a second support portion 55, and a connecting portion 54. Alternatively, the support body 530 may be straight.

[0195] In one example, the buffer 531 is disposed between the first support 53 and the protective member 52, or between the second support 55 and the protective member 52.

[0196] In another example, the support body 530 is fixedly connected to the support member 51, the buffer member 531 is connected to the protective member 52, and the support body 530 abuts against the buffer member 531.

[0197] In another example, the support body 530 is fixedly connected to the support member 51, the buffer member 531 is connected to the support body 530, and the buffer member 531 abuts against the protective member 52.

[0198] For example, the buffer 531 can be foam, rubber pad, silicone, etc.

[0199] In the embodiments of this application, by providing a buffer 531 between the support body 530 and the protective member 52, the buffering capacity of the box 5 is improved, and the abnormal noise generated by the collision between the support body 530 and the protective member 52 is reduced.

[0200] Figure 13 This is a cross-sectional view of another structure of the support member 50 of the battery device 2 according to an embodiment of this application.

[0201] like Figures 5 to 13 As shown, further, in some embodiments of this application, the support member 50 extends along a third direction Y and is in a straight shape.

[0202] For example, the support member 50 can be a flat plate.

[0203] In one example, the support 50 includes a support body 530 and a buffer 531, the support body being flat and contacting the protective member 52 through the buffer 531.

[0204] In the embodiments of this application, the support member 50 is made flat, thereby shortening the distance between the protective member 52 and the support member 51, which makes it easier to reduce the height and volume of the battery device 2 and achieve the lightweighting of the battery device 2.

[0205] In an optional embodiment of this application, along the second direction X, the overlap length between the first sub-part 501 and the second sub-part 502 and the support member 51 is greater than or equal to 5 mm. The overlap length between the first sub-part 501 and the second sub-part 502 and the support member 51 may be the same or different. As an example, the overlap length between the first sub-part 501 and the second sub-part 502 and the support member 51 is one or a combination of two of the following: 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, 15 mm, and 20 mm.

[0206] Furthermore, in one embodiment of this application, the distance between the support member 51 and the protective member 52 is less than or equal to 3 mm.

[0207] As an example, the distance between the support 51 and the protective element 52 is a range of one or two of the following: 3mm, 2.8mm, 2.5mm, 2mm, 1.6mm, 1.5mm, 1.2mm, 1mm, and 0.5mm.

[0208] In the embodiments of this application, the distance between the support 51 and the protective member 52 is less than or equal to 3mm, which facilitates the reduction of the height and volume of the battery device 2 and achieves the lightweighting of the battery device 2.

[0209] In an optional embodiment of this application, when the distance between the support member 51 and the protective member 52 is greater than 3mm, the support member 50 includes a first support portion 53, a second support portion 55, and a connecting portion 54.

[0210] In other embodiments of this application, the thickness of the protective member 52 ranges from 0.7mm to 1.5mm. As an example, the thickness of the protective member 52 is one or two of 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, and 1.5mm.

[0211] In other embodiments of this application, the thickness of the support member 50 ranges from 0.8mm to 2mm. As an example, the thickness of the support member 50 is one or two of 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, and 2mm.

[0212] In one example of this application, the thickness of the protective member 52 is greater than the thickness of the support member 50.

[0213] In some embodiments of this application, the support member 51 includes a first support plate 514 and a second support plate 515 stacked along a first direction Z. The second support plate 515 is placed between the first support plate 514 and the protective member 52, and an intermediate cavity 512 is formed between the first support plate 514 and the second support plate 515. The first support plate 514 has a first opening 511, and the second support plate 515 has a third opening 513. The third opening 513 is disposed opposite to the first opening 511, and the first opening 511 and the third opening 513 are connected through the intermediate cavity 512 to form a first channel 510.

[0214] For example, the first support plate 514 and the second support plate 515 may be integrally formed, fixedly connected, or detachably connected.

[0215] The intermediate cavity 512 is connected to the first opening 511 and the third opening 513 respectively. For example, the shape of the third opening 513 can be simple or complex, such as a circle, an ellipse, a rectangle, or a pentagon.

[0216] In one example, the first opening 511 and the third opening 513 may have the same or different shapes, and the size of the first opening 511 may be the same or different.

[0217] In one example, the orthographic projection of the first opening 511 onto the protective member 52 overlaps with the orthographic projection of the pressure relief mechanism 70 onto the protective member 52; the orthographic projection of the third opening 513 onto the protective member 52 is larger than the orthographic projection of the first opening 511 onto the protective member 52 and at least partially overlaps with it. As an example, the orthographic projection of the third opening 513 onto the protective member 52 overlaps with the orthographic projection of the first opening 511 onto the protective member 52.

[0218] In some examples, the first opening 511 of the first support 53 is opposite to the third opening 513. The first opening 511 faces the pressure relief mechanism 70.

[0219] In other examples, the second support 55 is opposite to the third opening 513. The first opening 511 faces the protective member 52.

[0220] In the embodiments of this application, a double-layer structure is provided by the support member 51 to form an intermediate cavity 512, which improves the strength of the housing 5 and the buffering capacity of the support member 51, and is more conducive to improving the stability of the battery device 2.

[0221] In some alternative embodiments of this application, the elongation of the protective member 52 is greater than that of the support member 50; and / or, the tensile strength of the support member 50 is greater than that of the protective member 52.

[0222] For example, the elongation of the protective member 52 is greater than the elongation of the support member 50 or the tensile strength of the support member 50 is greater than the tensile strength of the protective member 52, or the elongation of the protective member 52 is greater than the elongation of the support member 50 and the tensile strength of the support member 50 is greater than the tensile strength of the protective member 52.

[0223] In one example of this application, the elongation of the protective member 52 and the elongation of the support member 50 can be obtained by testing according to GB / T228-1987 Metallic Materials - Tensile Testing Method.

[0224] In one example of this application, the tensile strength of the support 50 and the tensile strength of the protective member 52 can be obtained by testing according to GB / T10120-2013 Metallic Materials Tensile Stress Relaxation Test Method.

[0225] In the embodiments of this application, the elongation rate of the protective member 52 is greater than that of the support member 50. In the bottom ball impact test, the protective member 52 is less likely to break, ensuring the sealing performance of the battery device 2. The tensile strength of the support member 50 is greater than that of the protective member 52. In the bottom ball impact test, this ensures the rigidity of the housing 5 and improves the impact resistance of the battery device 2. This application provides an electrical device including the battery device 2 described in the above embodiments.

[0226] like Figures 4 to 12 As shown, some embodiments of this application provide a battery device 2 including a plurality of battery cells 7 and a housing 5. The battery cells 7 include a pressure relief mechanism 70. The plurality of battery cells 7 are housed in the housing 5. The housing 5 includes a support member 51, a protective member 52, and a support member 50. The plurality of battery cells 7 are disposed on one side of the support member 51 along a first direction Z. At least a portion of the protective member 52 is disposed on the side of the support member 51 away from the plurality of battery cells 7. The protective member 52 is connected to the support member 51. The pressure relief mechanism 70 is disposed at the end of the battery cell 7 facing the support member 51.

[0227] The support member 51 is provided with a first channel 510. The support member 51 includes a first support plate 514 and a second support plate 515 stacked along the first direction Z. The second support plate 515 is placed between the first support plate 514 and the protective member 52, and an intermediate cavity 512 is formed between the first support plate 514 and the second support plate 515. The first support plate 514 has a first opening 511, and the second support plate 515 has a third opening 513. The third opening 513 is opposite to the first opening 511, and the first opening 511 and the third opening 513 are connected through the intermediate cavity 512 to form the first channel 510. The first opening 511 is opposite to the pressure relief mechanism 70 along the first direction Z.

[0228] Along the first direction Z, a pressure relief chamber 520 is formed between the support member 51 and the protective member 52. The support member 50 includes a first support part 53, a second support part 55 and a connecting part 54. The connecting part 54 is connected between the first support part 53 and the second support part 55 along the first direction Z. The second support part 55 is disposed between the pressure relief mechanism 70 and the protective member 52. The first support part 53 is connected to the support member 51, and the second support part 55 is connected to the protective member 52.

[0229] The connecting portion 54 includes a first arm 503 and a second arm 504 disposed opposite to each other along the second direction X. A second support portion 55 connects the first arm 503 and the second arm 504. The first support portion 53 includes a first sub-portion 501 and a second sub-portion 502. The first sub-portion 501 and the second sub-portion 502 are respectively connected to the first arm 503 and the second arm 504. Along the second direction X, the first sub-portion 501 and the second sub-portion 502 are positioned on opposite sides of the first arm 503 and the second arm 504, forming a second opening 505. The second opening 505 is disposed opposite to the second support portion 55. The second opening 505 faces the pressure relief mechanism 70.

[0230] The distance between the first arm 503 and the second arm 504 and the end connected to the first support 53 is greater than the distance between the first arm 503 and the second arm 504 and the end connected to the second connecting part 54.

[0231] The support member 50 is provided with a second channel 56, which connects the pressure relief chamber 520 and the first channel 510. The support member 50 has multiple members, spaced apart along the second direction X and extending along the third direction Y. At least a portion of at least one of the first sub-parts 501 and the second sub-parts 502 protrudes towards the second support member 55 to form a through channel 507. The first support member 53, the second support member 55, and the connecting member 54 enclose a buffer chamber 506. The through channel 507 connects the pressure relief chamber 520 and the buffer chamber 506. The second channel 56 includes a connecting second opening 505, the buffer chamber 506, and the through channel 507. The first direction Z, the second direction X, and the third direction Y are all perpendicular to each other. Along the second direction X, multiple sub-holes 509 are provided through the first arm 503 and the second arm 504, and these sub-holes 509 are spaced apart along the third direction Y.

[0232] The support member 50 also includes a buffer member, which is disposed between the second support part 55 and the protective member 52. The buffer member can be foam.

[0233] The support member 50 adopts a Z-shaped bracket structure, providing strong support through the connecting part 54, transferring the energy of the ball impact at the bottom to the support member 51. Simultaneously, the deformation of the support member 50 absorbs energy. The pressure relief mechanism 70, with its two-layer plate thickness relative to the support member 50 and the protective member 52, increases rigidity and resists deformation. The support member 50 guides the discharge of harmful high-temperature gases through the sub-hole 509 and the through channel 507, improving the safety performance of the battery device 2.

[0234] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. Unless otherwise specified, all technical features and optional technical features of this application can be combined to form new technical solutions.

[0235] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended 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 they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A battery device, characterized in that, include: Multiple battery cells, each battery cell including a pressure relief mechanism; A housing, in which a plurality of battery cells are housed, the housing includes a support, a protective member, and a structural member, the plurality of battery cells being disposed on one side of the support along a first direction, at least a portion of the protective member being disposed on the side of the support away from the plurality of battery cells, and the protective member being connected to the support. The pressure relief mechanism is located at the end of the battery cell facing the support member. The support member has a first channel, and the first channel forms a first opening on the support member. The first opening is opposite to the pressure relief mechanism along the first direction. Along the first direction, a pressure relief cavity is formed between the support member and the protective member, at least a portion of the support member is disposed between the pressure relief mechanism and the protective member, and the support member is in contact with the support member and the protective member respectively, and another portion of the support member is disposed between the pressure relief mechanism and the protective member; The support member is provided with a second channel, which connects the pressure relief chamber and the first channel.

2. The battery device according to claim 1, characterized in that, The support member includes a first support portion, a second support portion, and a connecting portion. The connecting portion is connected between the first support portion and the second support portion along the first direction. Along the first direction, at least a portion of the first support portion is placed between the support member and the protective member, and at least a portion of the second support portion is placed between the pressure relief mechanism and the protective member.

3. The battery device according to claim 2, characterized in that, The connecting portion includes a first arm and a second arm disposed opposite to each other along a second direction, and the second support portion is connected between the first arm and the second arm. The first support portion includes a first sub-part and a second sub-part. The first sub-part and the second sub-part are respectively connected to the first arm and the second arm. Along the second direction, the first sub-part and the second sub-part are both placed between the first arm and the second arm to form a second opening. The second opening is disposed opposite to the second support part, and the first direction and the second direction intersect.

4. The battery device according to claim 2, characterized in that, The connecting portion includes a first arm and a second arm disposed opposite to each other along a second direction, and the second support portion is connected between the first arm and the second arm. The first support portion includes a first sub-part and a second sub-part. The first sub-part and the second sub-part are respectively connected to the first arm and the second arm. Along the second direction, the first sub-part and the second sub-part are placed on opposite sides of the first arm and the second arm to form a second opening. The second opening is disposed opposite to the second support part, and the first direction and the second direction intersect.

5. The battery device according to claim 4, characterized in that, The second support is connected to the protective member, the first support is connected to the support member, the second opening faces the pressure relief mechanism, and the second opening is part of the second channel.

6. The battery device according to claim 4, characterized in that, The second opening faces the protective member, the second support is connected to the support member, and the first support is connected to the protective member; The second support portion has a through hole, which is disposed opposite to the pressure relief mechanism and is part of the second channel.

7. The battery device according to any one of claims 4 to 6, characterized in that, At least a portion of at least one of the first sub-part and the second sub-part protrudes toward the direction of the second support portion to form a through channel; The first support portion, the second support portion, and the connecting portion enclose a buffer cavity, and the through channel connects the buffer cavity and the pressure relief cavity. The through channel is a part of the second channel.

8. The battery device according to any one of claims 4 to 6, characterized in that, The distance between the first arm and the second arm along the second direction tends to decrease from the first support portion towards the second support portion.

9. The battery device according to any one of claims 3 to 6, characterized in that, At least one of the first arm and the second arm has a plurality of sub-holes that communicate with the pressure relief chamber, and the plurality of sub-holes are spaced apart along a third direction.

10. The battery device according to claim 1, characterized in that, The support includes a support body and a buffer. The support body contacts the protective member through the buffer. The second channel is disposed on the support body.

11. The battery device according to claim 10, characterized in that, The support extends along a third direction and is straight.

12. The battery device according to claim 11, characterized in that, The distance between the support and the protective component is less than or equal to 3 mm.

13. The battery device according to claim 1, characterized in that, The elongation rate of the protective component is greater than that of the support component; And / or, the tensile strength of the support member is greater than the tensile strength of the protective member.

14. The battery device according to claim 1, characterized in that, The support member includes a first support plate and a second support plate stacked along the first direction, the second support plate being placed between the first support plate and the protective member, and an intermediate cavity being formed between the first support plate and the second support plate; The first support plate has the first opening, and the second support plate has the third opening. The third opening is opposite to the first opening, and the first opening and the third opening are connected through the intermediate cavity to form the first channel.

15. An electrical appliance, characterized in that, The battery device includes any one of claims 1 to 14.

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