Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device. The battery device comprises a battery monomer and a buffer assembly, the number of the battery monomers is multiple, and the multiple battery monomers are distributed at intervals in the first direction. The buffer assembly comprises a buffer piece and a connecting piece, the buffer piece is arranged on at least one side of each battery monomer along the first direction, the buffer piece is provided with fluid, and at least part of the buffer piece is communicated with the connecting piece, so that the fluid can flow between the buffer piece and the connecting piece. The embodiment of the utility model is beneficial to improving the reliability of the battery device.

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, battery devices are being used more and more widely, such as 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 improve the reliability of battery devices is a technical problem that urgently needs to be solved. Utility Model Content

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

[0005] In a first aspect, this application provides a battery device, comprising: a battery cell, wherein the number of battery cells is multiple and the multiple battery cells are spaced apart along a first direction; a buffer assembly, comprising a buffer element and a connector, wherein each battery cell is provided with a buffer element on at least one side along the first direction, the buffer element is filled with fluid, and at least a portion of the buffer element is connected to the connector so that the fluid can flow between the buffer element and the connector.

[0006] In some embodiments of the first aspect, by providing a fluid-filled buffer on at least one side of each battery cell along a first direction, when the battery cell expands during cycling, the battery cell squeezes the adjacent buffer, and the fluid in the buffer can flow from the position of greater force to the position of less force. The buffer can provide expansion space for the battery cell, making the battery cell uniformly stressed. Furthermore, by communicating at least a portion of the buffer with a connector, the fluid in the buffer can also flow to the connector, and the connector can share the pressure on the buffer. Alternatively, the fluid in one buffer can also flow to another buffer via the connector, allowing the fluid to flow within the buffer between different battery cells to adjust the stress between different battery cells, making the stress between different battery cells balanced, thereby improving the reliability of the battery device.

[0007] In some embodiments, the length of the buffer element along the first direction is adjustable. This arrangement ensures that the buffer element effectively provides expansion space for the battery cells.

[0008] In some embodiments, the buffer includes a wall portion that encloses a cavity filled with fluid, and a connector is configured to communicate with at least a portion of the cavity. This design is simple and easy to assemble.

[0009] In some embodiments, buffer members are provided on both sides of each battery cell along the first direction. This arrangement provides expansion space on both sides of the battery cell along the first direction, ensuring uniform stress on each battery cell.

[0010] In some embodiments, the battery cells and buffer components are alternately distributed along a first direction. This design layout is reasonable and helps to reduce costs.

[0011] In some embodiments, the battery device further includes a pressure relief structure disposed within the buffer assembly. The pressure relief structure releases fluid from the buffer assembly, providing more space for the expansion of individual battery cells, preventing safety issues from occurring in the individual cells, and thereby improving the reliability of the battery device.

[0012] In some embodiments, each buffer is connected in communication with a connector, and at least one of the connector and the buffer is provided with a pressure relief structure. This arrangement improves the flexibility of the battery device.

[0013] In some embodiments, a portion of the buffer is connected to the connector, while another portion of the buffer is isolated from the connector. The buffer isolated from the connector is equipped with a pressure relief structure. This configuration improves the flexibility of the battery device.

[0014] In some embodiments, either the connector or the buffer member communicating with the connector is provided with a pressure relief structure. This arrangement helps to improve the reliability of the battery device.

[0015] In some embodiments, the number of connectors is set to multiple, and each connector is connected to at least two buffers. This arrangement improves the flexibility of the battery device and also enhances its reliability.

[0016] In some embodiments, at least two buffer components are designated as first buffer components, and at least two buffer components are designated as second buffer components. The at least two first buffer components are connected through one of the connecting members, and the at least two second buffer components are connected through the other connecting member. This arrangement improves the flexibility of the battery device.

[0017] In some embodiments, the length of the first buffer member in the first direction is smaller than the length of the second buffer member in the first direction. This arrangement helps to improve the reliability of the battery device.

[0018] In some embodiments, the first buffer component and the second buffer component are alternately distributed along a first direction. This design layout is reasonable.

[0019] In some embodiments, the connector includes a main pipe and at least two sub-pipes, the sub-pipes connecting the main pipe and the buffer. This arrangement ensures the effectiveness of the connection between the buffer and the connector.

[0020] In some embodiments, the battery cell includes a first surface opposite to the first surface along a first direction, and a second surface connected between the oppositely disposed first surfaces, wherein the area of ​​the first surface is larger than the area of ​​the second surface. This arrangement is reasonable and can better provide expansion space for the battery cell.

[0021] In some embodiments, the orthographic projections of the connector and the battery cell are staggered along the height direction, intersecting at a first direction. This design layout is reasonable and helps to reduce the space occupied.

[0022] In some embodiments, the buffer and the connector are an integral structure. This design improves manufacturing efficiency.

[0023] Secondly, this application provides an electrical device, including a battery device according to any embodiment of the first aspect, the battery device being used to store or provide electrical energy.

[0024] 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

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. 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:

[0026] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0027] Figure 2 This application provides an exploded structural diagram of a battery device according to some embodiments.

[0028] Figure 3 This application provides a schematic diagram of the structure of a battery cell assembly according to some embodiments;

[0029] Figure 4 This application provides an exploded structural diagram of a single battery cell for some embodiments.

[0030] Figure 5A top view of a battery device provided for some embodiments of this application;

[0031] Figure 6 A top view of a battery device provided for other embodiments of this application;

[0032] Figure 7 A top view of a battery device provided for some embodiments of this application;

[0033] Figure 8 This is a top view of a battery device provided for some embodiments of this application.

[0034] The reference numerals in the detailed embodiments are as follows:

[0035] 100. Vehicle; 1. Battery unit; 2. Controller; 3. Motor; 1a. Battery cell assembly; 40. Housing; 410. First housing; 420. Second housing;

[0036] 10. Battery cell; 101. First side; 102. Second side; 11. Casing; 111. End cap; 112. Housing; 12. Electrode assembly; 13. Electrode terminal;

[0037] 20. Buffer assembly; 21. Buffer component; 211. Wall; 212. Cavity; 21a. First buffer component; 21b. Second buffer component; 22. Connector; 221. Main pipe; 222. Sub-pipe;

[0038] 30. Pressure relief structure;

[0039] X, first direction; Y, height direction. Detailed Implementation

[0040] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0041] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0042] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0043] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0044] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0045] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0047] The development of battery technology must consider multiple design factors simultaneously, such as battery life, energy density, discharge capacity, and charge / discharge rate. Additionally, the reliability of the battery device must also be considered.

[0048] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0049] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0050] In battery devices of related technologies, the volume of individual cells expands during cycling due to the continuous insertion and extraction of lithium ions and the growth of the solid electrolyte interface film. This expansion of individual cells can then compress adjacent cells within the battery device, affecting their performance, accelerating degradation, and ultimately reducing the reliability of the battery device.

[0051] To address the aforementioned technical issues, this application provides a battery device including a battery cell and a buffer assembly. The battery cells are multiple and spaced apart along a first direction. The buffer assembly includes a buffer element and a connector. Each battery cell has a buffer element disposed on at least one side along the first direction. The buffer element is filled with fluid, and at least a portion of the buffer element is connected to the connector, allowing the fluid to flow between the buffer element and the connector.

[0052] By providing a fluid-filled buffer on at least one side of each battery cell along a first direction, when the battery cell expands during cycling, it squeezes the adjacent buffer. The fluid in the buffer can flow from the position of greater force to the position of less force. The buffer can provide expansion space for the battery cell, making the force on the battery cell uniform. Furthermore, by connecting at least a portion of the buffer to the connector, the fluid in the buffer can also flow to the connector. The connector can share the pressure on the buffer. Alternatively, the fluid in one buffer can also flow to another buffer through the connector, allowing the fluid to flow within the buffer between different battery cells to adjust the force between different battery cells and balance the force between different battery cells, thereby improving the reliability of the battery device.

[0053] The technical solutions described in the embodiments of this application are applicable to various power devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0054] It should be understood that the technical solutions described in the embodiments of this application are not limited to the devices described above, but can also be applied to all devices that use battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0055] For example, such as Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of a vehicle 100 according to one embodiment of this application. The vehicle 100 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. The vehicle 100 can have a motor 3, a controller 2, and a battery device 1 installed inside. The controller 2 controls the battery device 1 to supply power to the motor 3. For example, the battery device 1 can be installed at the bottom, front, or rear of the vehicle 100. The battery device 1 can be used to power the vehicle 100. For example, the battery device 1 can serve as the operating power source for the vehicle 100's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 100. In another embodiment of this application, the battery device 1 can not only serve as the operating power source for the vehicle 100 but also as the driving power source, replacing or partially replacing gasoline or natural gas to provide driving power to the vehicle 100.

[0056] Please see Figure 2 and Figure 3 The battery device 1 mentioned in the embodiments of this application may include one or more battery cell assemblies 1a for providing voltage and capacity. The battery cell assembly 1a may include multiple battery cells 10, which are connected in series, parallel or mixed connection through a busbar.

[0057] In some embodiments, the battery cell assembly 1a is typically formed by arranging a plurality of battery cells 10.

[0058] As an example, the battery cell assembly 1a can be a battery module, which is formed by arranging and fixing multiple battery cells 10 into an independent module. As an example, the battery module can be formed by bundling multiple battery cells 10 together with cable ties.

[0059] like Figure 2As shown, in some embodiments, the battery device 1 may be a battery pack, which includes a housing 40 and one or more battery cell assemblies 1a, the battery cell assemblies 1a being housed in the housing 40.

[0060] As an example, the battery cell assembly 1a can be a battery module, and the battery cell assembly 1a can be housed in the housing 40 by fixing the battery module in the housing 40.

[0061] As an example, the battery cell assembly 1a can also be housed in the housing 40 by directly fixing multiple battery cells 10 to the housing 40.

[0062] As an example, the housing 40 may include a first housing 410 and a second housing 420. The first housing 410 and the second housing 420 are fastened together to form a receiving cavity, thereby creating a closed space inside the housing 40 to house the battery cell assembly 1a. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 410 may be a top cover or a bottom plate.

[0063] As an example, the housing 40 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the housing 40 forms an enclosed space to accommodate the battery cell assembly 1a.

[0064] In some embodiments, the housing 40 may be part of the chassis structure of the vehicle 100. For example, a portion of the housing 40 may be at least a portion of the floor of the vehicle 100, or a portion of the housing 40 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 100.

[0065] Please see Figure 4 The battery cell 10 includes a casing 11, an electrode assembly 12, and an electrode terminal 13.

[0066] The outer casing 11 is a component used to form the internal environment of the battery cell 10. The internal environment formed therein can be used to house the electrode assembly 12, as well as the electrolyte and other components. Optionally, the outer casing 11 can be, but is not limited to, made of metallic or non-metallic materials. For example, metallic materials can be copper, aluminum, or stainless steel; non-metallic materials can be polyethylene, polypropylene, or polyvinyl chloride.

[0067] For example, the outer shell 11 can be a steel shell, an aluminum shell, a plastic shell (such as a polypropylene shell), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0068] In some embodiments, the housing 11 can be a sealed structure or a non-sealed structure. As an example, when the housing 11 is a non-sealed structure, it serves to protect the electrode assembly 12, and a sealing bag is included between the housing 11 and the electrode assembly 12. The sealing bag is used to encapsulate the electrode assembly 12 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating component or an aluminum-plastic film. When the housing 11 is a sealed structure, it is used to encapsulate the electrode assembly 12 and the electrolyte, among other components.

[0069] In some embodiments, the housing includes an end cap 111 and a housing 112, the housing 112 having an opening, and the end cap 111 covering the opening. The housing 112 may have one or more openings. The end cap 111 may also be provided one or more times.

[0070] The shape of the outer shell 11 can be determined according to the specific shape of the electrode assembly 12. For example, if the electrode assembly 12 is a cuboid structure, a cuboid outer shell can be selected; if the electrode assembly 12 is a cylindrical structure, a cylindrical outer shell can be selected.

[0071] Electrode assembly 12 is a component in the battery cell 10 where an electrochemical reaction occurs, and the housing 11 may contain one or more electrode assemblies 12.

[0072] In some embodiments, the electrode assembly 12 may be cylindrical, flat, or polygonal, etc.

[0073] The electrode assembly 12 can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0074] The electrode assembly 12 includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of the battery cell 10, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0075] In some embodiments, at least one electrode terminal 13 is provided on the housing 11, and the electrode terminal 13 is electrically connected to the tab of the electrode assembly 12. The electrode terminal 13 can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector.

[0076] Electrode terminal 13 can be electrically connected to electrode assembly 12 for outputting or inputting electrical energy into battery cell 10. Electrode terminal 13 can be electrically connected to electrode assembly 12 by connecting to tabs. The tabs electrically connected to electrode terminal 13 can be either positive or negative tabs.

[0077] In this application, the battery cell 10 may include, but is not limited to, one of a lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell.

[0078] As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0079] Please refer to the following: Figures 1 to 8 According to an embodiment of this application, a battery device 1 is provided, including a battery cell 10 and a buffer assembly 20. The number of battery cells 10 is plurality of, and the plurality of battery cells 10 are spaced apart along a first direction X. The buffer assembly 20 includes a buffer element 21 and a connector 22. Each battery cell 10 has a buffer element 21 disposed on at least one side along the first direction X. The buffer element 21 is filled with fluid, and at least a portion of the buffer element 21 is connected to the connector 22, allowing the fluid to flow between the buffer element 21 and the connector 22.

[0080] In this embodiment of the application, the first direction X can be represented as the thickness direction of the battery cell 10.

[0081] "Multiple" can be understood as two or more. The number of battery cells 10 can be set to two, or even three or more.

[0082] Multiple battery cells 10 are spaced apart along a first direction X. Each battery cell 10 is provided with a buffer 21 on one or both sides along the first direction X. The buffer 21 can be placed between two battery cells 10. When the battery cell 10 expands during the cycle, the battery cell 10 will squeeze the buffer 21. The buffer 21 deforms to provide expansion space for the battery cell 10. The fluid in the buffer 21 can flow between the buffer 21, so that the contact surface between the battery cell 10 and the buffer 21 is kept under uniform force during the expansion process, which is beneficial to improving the performance of the battery cell 10.

[0083] It is understandable that the degree of expansion at each location of the battery cell 10 is different. That is to say, the squeezing force provided by the battery cell 10 to different locations of the buffer 21 is different when the battery cell 10 expands. By filling the buffer 21 with fluid, the fluid can flow from the area of ​​greater force to the area of ​​less force within the buffer 21. This not only provides expansion space for the battery cell 10, but also ensures that the battery cell 10 is always in contact with the buffer 21 during the expansion process. This makes the force on the contact surface between the battery cell 10 and the buffer 21 uniform, preventing failure of the battery cell 10 due to uneven force, thereby improving the reliability of the battery device 1.

[0084] The connector 22 is used to connect at least a portion of the buffers 21. When the buffers 21 are squeezed by the battery cell 10, the fluid inside the buffers 21 can flow to the connector 22. The connector 22 can share the force on the buffers 21, avoid stress concentration and damage to the buffers 21, and help improve the service life of the buffer assembly 20.

[0085] It is understandable that if the buffer 21 is squeezed and fails, the battery cells 10 on both sides may shake due to the lack of the buffer 21 for fixation. In subsequent cycles, without the external force provided by the buffer 21, the electrode assembly 12 of the battery cell 10 is prone to wrinkling and lithium plating problem. Therefore, the connection 22 is provided to improve the reliability of the battery device 1.

[0086] In addition, the connector 22 can also facilitate fluid exchange between different buffers 21. In the battery device 1, the battery cells 10 at different positions expand to different degrees. The fluid in the buffer 21 adjacent to the battery cell 10 with a large degree of expansion can flow through the connector 22 to the buffer 21 adjacent to the battery cell 10 with a small degree of expansion, so that the battery cells 10 at different positions are subjected to the same force, thereby balancing the force among multiple battery cells 10 and improving the cycle performance of the battery device 1.

[0087] The battery device 1 provided in some embodiments of this application includes a buffer 21 filled with fluid on at least one side of each battery cell 10 along a first direction X. When the battery cell 10 expands during cycling, it squeezes the adjacent buffer 21. The fluid in the buffer 21 can flow from the position of greater force to the position of less force, so that the battery cell 10 is subjected to uniform force. Furthermore, by connecting at least a portion of the buffer 21 to the connector 22, the fluid in the buffer 21 can flow to the connector 22. The connector 22 can share the pressure on the buffer 21. Alternatively, the fluid in one buffer 21 can also flow to another buffer 21 through the connector 22, so that the fluid can flow in the buffer 21 between different battery cells 10 to adjust the force between different battery cells 10 and make the force between different battery cells 10 balanced, thereby improving the reliability of the battery device 1.

[0088] Optionally, the buffer 21 can be fitted to the battery cell 10 to provide a certain preload to fix the battery cell 10, which helps to improve the structural reliability of the battery device 1.

[0089] In some embodiments, each battery cell 10 is provided with a buffer 21 on one side along the first direction X.

[0090] In other embodiments, each battery cell 10 is provided with a buffer 21 on both sides along the first direction X.

[0091] Optionally, each battery cell 10 may be provided with a buffer 21 on at least one side along the first direction X, or it may be provided with two buffers 21, or it may be provided with multiple buffers 21.

[0092] The fluid can be, but is not limited to, one of the following: gas, insulating liquid, flowing solid substance, or gas-solid composite substance. A gas-solid composite substance refers to a mixture of gas and solid. The fluid can provide uniform pressure, and fluid leakage has no impact on electrical safety. Optionally, the fluid material can be one of the following: air, insulating silicone oil, or aerogel.

[0093] Optionally, the buffer 21 may be provided with a fluid of one material or with a fluid of two or more materials.

[0094] Alternatively, the connector 22 and the buffer 21 can be configured as an integral structure.

[0095] Optionally, the connector 22 and the buffer 21 can be provided separately, which helps to reduce the difficulty of processing and improve the flexibility of use. The connection method between the connector 22 and the buffer 21 can include, but is not limited to, welding, bonding, and plugging.

[0096] In some embodiments, all buffers 21 may be connected to connectors 22.

[0097] This configuration ensures that all battery cells 10 are subjected to balanced forces during the cycle, thereby improving the cycle performance of the battery device 1.

[0098] In other embodiments, a portion of the buffer 21 may be connected to the connector 22, while another portion of the buffer 21 may not be connected to the connector 22.

[0099] This design allows for specific adjustments based on the different degrees of expansion of individual battery cells 10, thereby improving the flexibility of the battery device 1.

[0100] In some alternative embodiments, the length of the buffer 21 along the first direction X is adjustable.

[0101] The adjustable length means that after the battery cell 10 expands, it will compress the buffer 21 along the first direction X, and the buffer 21 will deform along the first direction X after being compressed.

[0102] This configuration ensures that the buffer 21 can effectively provide expansion space for the battery cell 10.

[0103] Optionally, the buffer structure may also include a frame, with the buffer member 21 connected to the frame. The frame can limit the deformation of the buffer member 21 along the height direction Y, thereby limiting the buffer member 21, reducing the risk of displacement of the buffer member 21, and further improving the reliability of the battery device 1.

[0104] like Figure 5 As shown, in some alternative embodiments, the buffer 21 includes a wall 211 that encloses a cavity 212 filled with fluid, and the connector 22 is configured to communicate with at least a portion of the cavity 212.

[0105] The wall portion 211 can be made of heat-insulating material to provide heat insulation, thereby making the battery cell 10 safer and more stable during the cycle, preventing thermal runaway of the battery cell 10, thus avoiding safety issues, improving the reliability and service life of the battery device 1, and the battery cell 10 can also reduce its own expansion by utilizing the heat insulation performance of the wall portion 211.

[0106] Alternatively, the insulation material may include, but is not limited to, aerogel and foam.

[0107] Alternatively, the insulation material can also be any of polyimide, phenolic foam, polyurethane foam, or polyester.

[0108] The battery device 1 provided in some embodiments of this application is simple in structure and easy to assemble when configured in the manner described above.

[0109] Optionally, the wall may be provided with a grid structure.

[0110] Please see Figure 2 and Figure 6 In some alternative embodiments, each battery cell 10 is provided with a buffer 21 on both sides along the first direction X.

[0111] Each battery cell 10 is provided with a buffer 21 on both sides along the first direction X, so that the buffer assembly 20 can provide expansion space for each battery cell 10, so that each battery cell 10 is subjected to uniform force, preventing safety problems of the battery cell 10, thereby improving the reliability of the battery device 1.

[0112] Furthermore, in some embodiments of this application, the battery device 1 is configured in the manner described above, with buffer members 21 provided on the opposite sides of the battery cells 10 located on both sides along the first direction X in the battery device 1. That is, buffer members 21 are provided between the two battery cells 10 and the housing 40, which can prevent the battery cells 10 from being squeezed by the housing 40 after expansion. This not only makes the battery cells 10 safer, but also does not affect the structural strength of the housing 40, thereby improving the reliability of the battery device 1.

[0113] Furthermore, by providing a buffer 21 between the housing 40 and the battery cell 10, when the battery device 1 is subjected to an external impact, the buffer 21 can absorb at least part of the impact force transmitted from the housing 40 to the battery cell 10, thereby improving the reliability of the battery cell 10 and thus improving the reliability of the battery device 1.

[0114] Optionally, each battery cell 10 may be provided with a buffer 21 on both sides along the first direction X, or there may be two or more buffers 21.

[0115] Please see Figures 5 to 8 In some alternative embodiments, the battery cells 10 and the buffer 21 are alternately distributed along the first direction X.

[0116] Alternating distribution can be understood as follows: the battery device 1, pointing from one side to the other in the first direction X, can be arranged sequentially with battery cell 10, buffer 21, battery cell 10, buffer 21, ..., battery cell 10; or, it can be arranged sequentially with buffer 21, battery cell 10, buffer 21, ..., battery cell 10, buffer 21; or, it can be arranged sequentially with buffer 21, battery cell 10, buffer 21, ..., battery cell 10.

[0117] For example, each battery cell 10 is provided with a buffer 21 on both sides along the first direction X, and the battery cell 10 and the buffer 21 are alternately distributed along the first direction X.

[0118] The battery device 1 provided in some embodiments of this application, arranged in the above manner, has a reasonable layout, which can save space to accommodate more battery cells 10, thereby improving the energy density of the battery device 1, and also helps to reduce costs.

[0119] Please see Figures 5 to 8 In some alternative embodiments, the battery device 1 further includes a pressure relief structure 30 disposed on the buffer assembly 20.

[0120] The pressure relief structure 30 is used to discharge the fluid in the buffer 21. When the expansion of the battery cell 10 reaches a certain set value, that is, when the pressure on the buffer 21 exceeds the predetermined threshold, the pressure relief structure 30 opens to discharge the fluid, making the thickness of the buffer 21 thinner and providing more expansion space for the battery cell 10.

[0121] As an example, the internal pressure of the buffer 21 is actuated to release fluid when it reaches a predetermined threshold. When the battery cell 10 expands to a certain extent, causing the pressure on the adjacent buffer 21 to reach the predetermined threshold, the pressure relief structure 30 is activated or a weak structure provided in the pressure relief structure 30 is destroyed, thereby forming an opening or channel for fluid release. This threshold design varies depending on the design requirements.

[0122] The pressure relief structure 30 may include, but is not limited to, a notch or a valve.

[0123] In some embodiments, the pressure relief structure 30 may be provided on the buffer 21.

[0124] Optionally, the pressure relief structure 30 can be integrally formed with the buffer 21.

[0125] Alternatively, the pressure relief structure 30 can also be separately configured and connected to the buffer 21.

[0126] In some embodiments, the pressure relief structure 30 may also be provided on the connector 22.

[0127] Optionally, the pressure relief structure 30 can be integrally formed with the connector 22.

[0128] Alternatively, the pressure relief structure 30 can also be separately configured and connected to the connector 22.

[0129] In other embodiments, both the buffer 21 and the connector 22 may be provided with a pressure relief structure 30.

[0130] The term "actuation" as used in this application refers to the pressure relief structure 30 being activated or reaching a certain state, thereby allowing the fluid in the buffer 21 to be released. When the pressure relief structure 30 is actuated, the fluid inside the buffer 21 is discharged outward from the actuated part, reducing the length of the buffer 21 in the first direction X. This provides more space for the expansion of the battery cell 10, preventing safety issues from occurring in the battery cell 10, and thus improving the reliability of the battery device 1.

[0131] like Figures 5 to 7 As shown, in some optional embodiments, each buffer 21 is connected to the connector 22, and at least one of the connector 22 and the buffer 21 is provided with a pressure relief structure 30.

[0132] like Figure 7 As shown, in some embodiments, the buffer 21 may be provided with a pressure relief structure 30. When the internal pressure of the buffer 21 reaches a predetermined threshold, it is actuated to release fluid. This allows the fluid in the buffer 21 to be discharged quickly, so as to provide more expansion space for the battery cell 10 more quickly.

[0133] like Figure 5 and Figure 6 As shown, in some embodiments, the connector 22 may be provided with a pressure relief structure 30. When the internal pressure of the buffer 21 reaches a predetermined threshold, the pressure relief structure 30 on the connector 22 is actuated to release fluid. This arrangement allows at least a portion of the fluid in the buffer 21 to flow to the connector 22, thereby increasing the pressure threshold that the buffer 21 can withstand, enabling it to continue to provide a fixing effect on the battery cell 10, preventing displacement of the battery cell 10, and thus improving the reliability of the battery device 1.

[0134] In other embodiments, both the connector 22 and the buffer 21 may be provided with a pressure relief structure 30.

[0135] The battery device 1 provided in some embodiments of this application is configured in the manner described above, which helps to improve the flexibility of use of the battery device 1.

[0136] For example, connector 22 is provided with a pressure relief structure 30.

[0137] Optionally, the pressure relief structure 30 and the connector 22 can be made of the same material, and the thickness of the pressure relief structure 30 is less than the thickness of the connector 22. When the pressure on the buffer 21 reaches a predetermined threshold, the fluid can break through the pressure relief structure 30 and be discharged from it.

[0138] Optionally, the pressure relief structure 30 and the connector 22 may be made of different materials, and the pressure resistance of the pressure relief structure 30 is lower than that of the connector 22. When the pressure on the buffer 21 reaches a predetermined threshold, the fluid can break through the pressure relief structure 30 and be discharged from it.

[0139] Optionally, the pressure relief structure 30 can also be a valve disposed on the connector 22. When the pressure on the buffer 21 reaches a predetermined threshold, the valve opens to allow fluid to be discharged.

[0140] The battery device 1 provided in some embodiments of this application, by being configured in the above manner, is conducive to improving the service life of the buffer 21, providing better restraint force on the battery cell 10, preventing the battery cell 10 from shaking, thereby improving the reliability of the battery device 1.

[0141] In some alternative embodiments, a portion of the buffer 21 is connected to the connector 22, while another portion of the buffer 21 is isolated from the connector 22. The buffer 21 isolated from the connector 22 is provided with a pressure relief structure 30.

[0142] The isolation between the other part of the buffer 21 and the connector 22 can be understood as the other part of the buffer 21 and the connector 22 not being connected.

[0143] For example, in battery device 1, the expansion degree of the battery cell 10 located in the middle is greater than that of the battery cells 10 located in other positions during the cycle. Therefore, the buffer 21 adjacent to the battery cell 10 located in the middle can be separately provided with a pressure relief structure 30 to promptly discharge fluid and provide expansion space for the battery cell 10 with a larger expansion degree. The buffer 21 adjacent to the battery cells 10 in other positions can be connected to the connector 22 to always provide a fixing effect for the battery cell 10. Of course, the specific connection method of the buffer 21 should be set according to actual needs.

[0144] The battery device 1 provided in some embodiments of this application is configured in the manner described above, which helps to improve the flexibility and reliability of the battery device 1.

[0145] In some alternative embodiments, either the connector 22 or the buffer 21 connected in communication with the connector 22 is provided with a pressure relief structure 30.

[0146] The connector 22 may also be provided with a pressure relief structure 30, or the buffer 21 connected to the connector 22 may also be provided with a pressure relief structure 30, so that it can release pressure through the pressure relief structure 30 and provide expansion space for the battery cell 10.

[0147] The battery device 1 provided in some embodiments of this application is configured in the manner described above, which helps to improve the reliability of the battery device 1.

[0148] like Figure 8 As shown, in some embodiments, the number of connectors 22 is set to multiple, and each connector 22 is connected to at least two buffers 21.

[0149] Optionally, the number of connectors 22 can be set to two, three, or even more. Optionally, connectors 22 can communicate with two buffers 21, and of course, they can also be configured to communicate with more buffers 21.

[0150] For example, the buffer 21 adjacent to the battery cell 10 with a larger degree of expansion can be configured to be connected to the same connector 22, and the buffer 21 adjacent to the battery cell 10 with a smaller degree of expansion can be configured to be connected to another connector 22. After the buffer 21 adjacent to the battery cell 10 with a larger degree of expansion is depressurized, the buffer 21 adjacent to the battery cell 10 with a smaller degree of expansion can still provide a fixed support function to prevent the battery cell 10 from shaking.

[0151] The battery device 1 provided in some embodiments of this application is configured in the manner described above, which helps to improve the flexibility and reliability of the battery device 1.

[0152] Please continue reading. Figure 8 In some embodiments, at least two buffers 21 are designated as first buffer components 21a and at least two buffers 21 are designated as second buffer components 21b. At least two first buffer components 21a are connected through one of the connectors 22, and at least two second buffer components 21b are connected through the other connector 22.

[0153] The first buffer component 21a and the second buffer component 21b have different pressure relief thresholds. That is, when faced with the same compressive force, one of the first buffer component 21a and the second buffer component 21b will release pressure, while the other will not release pressure, so that it can continue to provide pre-tightening force to the battery cell 10 and provide space for continued buffer expansion.

[0154] By setting it up in the above way, gradient depressurization can be achieved, which can not only provide expansion space for the battery cell 10, but also prevent the battery cell 10 from shaking due to the complete depressurization of all buffers 21.

[0155] Optionally, the pressure relief structure 30 provided in the first buffer component 21a has a different pressure relief threshold than the pressure relief structure 30 provided in the second buffer component 21b.

[0156] Optionally, the pressure relief structures 30 installed on different connectors 22 have different pressure relief thresholds.

[0157] In some embodiments, the length of the first buffer member 21a in the first direction X is smaller than the length of the second buffer member 21b in the first direction X.

[0158] By setting it in this way, the pressure relief threshold of the first buffer component 21a is less than the pressure relief threshold of the second buffer component 21b, thereby enabling gradient pressure relief and improving the flexibility of the battery device 1.

[0159] In some embodiments, the first buffer component 21a and the second buffer component 21b are alternately distributed along the first direction X.

[0160] This design provides a reasonable layout, facilitates assembly, and ensures that each battery cell 10 is supported by a buffer 21, thereby improving reliability.

[0161] like Figure 5 As shown, in some embodiments, the connector 22 includes a main pipe 221 and at least two sub-pipes 222, the sub-pipes 222 being connected between the main pipe 221 and the buffer 21.

[0162] Fluid in one of the buffers 21 can flow into the main pipe 221 through one of the sub-pipes 222, and then into another buffer 21 through another sub-pipe 222.

[0163] This design is simple and ensures the effective connection between the buffer 21 and the connector 22.

[0164] In some embodiments, the battery cell 10 includes a first surface 101 facing each other along a first direction X, and a second surface 102 connected between the opposing first surfaces 101, wherein the area of ​​the first surface 101 is larger than the area of ​​the second surface 102.

[0165] The buffer 21 is disposed on the first surface 101 of the battery cell 10, which can better provide expansion space for the battery cell 10, thereby improving the reliability of the battery device 1.

[0166] In some embodiments, in the height direction Y of the battery cell 10, the orthographic projection of the connector 22 is staggered with the orthographic projection of the battery cell 10, and the height direction Y intersects with the first direction X.

[0167] In this context, the height direction Y of the battery cell 10 is also the height direction of the housing 40, the orthographic projection of the connector 22 is the orthographic projection of the connector 22 in the height direction Y, and the orthographic projection of the battery cell 10 is the orthographic projection of the battery cell 10 in the height direction Y.

[0168] The staggered arrangement can be understood as follows: in the height direction Y, the orthographic projection of the connector 22 and the orthographic projection of the battery cell 10 do not overlap. In other words, the connector 22 can be arranged in other directions of the battery cell 10 that intersect with the height direction Y, preventing it from occupying the space of the battery device 1 in the height direction Y, thereby facilitating the assembly of the battery cell 10 and the housing 40.

[0169] The layout is reasonable and helps to reduce the space occupied by the above method.

[0170] In some alternative embodiments, the buffer 21 and the connector 22 are an integral structure.

[0171] The buffer 21 and the connector 22 can be integrally formed, which helps to improve manufacturing efficiency and the connection strength between them, so as to prevent fluid leakage and thus improve the reliability of the battery device 1.

[0172] These can be formed through processes such as extrusion, stamping, or molding.

[0173] According to some embodiments of this application, this application also provides an electrical device, including the battery device 1 provided in any of the above embodiments, the battery device 1 being used to store or provide electrical energy.

[0174] Please see Figures 4 to 8 This application provides a battery device 1, which includes a battery cell 10, a buffer assembly 20, and a pressure relief structure 30.

[0175] The number of battery cells 10 is two or more, and the two or more battery cells 10 are spaced apart along the first direction X. Each battery cell 10 includes a first surface 101 facing each other along the first direction X, and a second surface 102 connected between the opposing first surfaces 101. The area of ​​the first surface 101 is larger than the area of ​​the second surface 102.

[0176] The buffer assembly 20 includes a buffer member 21 and a connector 22, which are integral structures. Each battery cell 10 has a buffer member 21 on both sides along the first direction X, and the battery cells 10 and buffer members 21 are alternately distributed along the first direction X. The length of the buffer member 21 along the first direction X is adjustable and includes a wall portion 211. The wall portion 211 encloses a cavity 212, which is filled with fluid. The connector 22 communicates with the cavity 212, allowing fluid to flow between the buffer member 21 and the connector 22. In the height direction Y of the battery cell 10, the orthographic projection of the connector 22 and the orthographic projection of the battery cell 10 are staggered, and the height direction Y intersects at the first direction X.

[0177] Each buffer component 21 is connected to a connector 22, and the connector 22 is provided with a pressure relief structure 30. The number of connectors 22 is two or more, and each connector 22 is connected to at least two buffer components 21. At least two buffer components 21 are first buffer components 21a, and at least two buffer components 21b are second buffer components 21b. At least two first buffer components 21a are connected through one of the connectors 22, and at least two second buffer components 21b are connected through the other connector 22. The first buffer components 21a and second buffer components 21b are alternately distributed along a first direction X. Each connector 22 includes a main pipe 221 and at least two sub-pipes 222, with the sub-pipes 222 connecting the main pipe 221 to the buffer component 21.

[0178] It should be noted that all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0179] 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 battery cell, wherein there are multiple battery cells, and the multiple battery cells are spaced apart along a first direction; A buffer assembly includes a buffer element and a connector. Each of the battery cells is provided with the buffer element on at least one side along the first direction. The buffer element is filled with fluid, and at least a portion of the buffer element is in communication with the connector, allowing the fluid to flow between the buffer element and the connector.

2. The battery device according to claim 1, characterized in that, The length of the buffer element along the first direction is adjustable.

3. The battery device according to claim 1 or 2, characterized in that, The buffer includes a wall portion that encloses a cavity filled with the fluid, and the connector is configured to communicate with at least a portion of the cavity.

4. The battery device according to any one of claims 1 to 3, characterized in that, Each of the battery cells is provided with a buffer on both sides along the first direction.

5. The battery device according to any one of claims 1 to 4, characterized in that, The battery cells and the buffer are alternately distributed along the first direction.

6. The battery device according to any one of claims 1 to 5, characterized in that, The battery device also includes a pressure relief structure disposed on the buffer assembly.

7. The battery device according to claim 6, characterized in that, Each of the buffer components is connected to the connecting component, and at least one of the connecting component and the buffer component is provided with the pressure relief structure.

8. The battery device according to claim 6, characterized in that, One part of the buffer is connected to the connector, and another part of the buffer is isolated from the connector. The buffer isolated from the connector is provided with the pressure relief structure.

9. The battery device according to claim 8, characterized in that, The pressure relief structure is provided in either the connector or the buffer that is connected to the connector.

10. The battery device according to any one of claims 1 to 9, characterized in that, The number of connectors is set to multiple, and each connector is connected to at least two buffers.

11. The battery device according to claim 10, characterized in that, At least two of the buffer components are first buffer components, at least two of the buffer components are second buffer components, at least two of the first buffer components are connected through one of the connectors, and at least two of the second buffer components are connected through the other connector.

12. The battery device according to claim 11, characterized in that, The length of the first buffer component in the first direction is smaller than the length of the second buffer component in the first direction.

13. The battery device according to claim 11 or 12, characterized in that, The first buffer component and the second buffer component are alternately distributed along the first direction.

14. The battery device according to any one of claims 1 to 13, characterized in that, The connector includes a main pipe and at least two sub-pipes, the sub-pipes being connected between the main pipe and the buffer.

15. The battery device according to any one of claims 1 to 14, characterized in that, The battery cell includes a first surface opposite to each other along the first direction and a second surface connected between the oppositely disposed first surfaces, wherein the area of ​​the first surface is larger than the area of ​​the second surface.

16. The battery device according to any one of claims 1 to 15, characterized in that, In the height direction of the battery cell, the orthographic projection of the connector is staggered with the orthographic projection of the battery cell, and the height direction intersects with the first direction.

17. The battery device according to any one of claims 1 to 16, characterized in that, The buffer and the connector are an integral structure.

18. An electrical appliance, characterized in that, Includes a battery device according to any one of claims 1 to 17, the battery device being used to store or provide electrical energy.

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