Battery device and electric device

Abstract

The application provides a battery device and a power consumption device. The battery device comprises a first shell, a battery cell assembly and a pressure adjusting assembly. The battery cell assembly is arranged in the first shell, and comprises a plurality of battery cells and an insulating piece. The battery cells are arranged along a first direction, and the insulating piece is arranged between two adjacent battery cells. The pressure adjusting assembly is arranged between the first shell and the battery cell assembly. The pressure adjusting assembly is connected with the first shell, and pressure adjusting assemblies are arranged on opposite sides of the battery cell assembly along the first direction. The pressure adjusting assemblies are configured to controllably apply pressure to the battery cell assembly.

Description

Technical Field

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

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

[0003] This application provides a battery device and an electrical device that improve the safety of the battery device.

[0004] This application provides a battery device including a first housing, a battery cell assembly, and a pressure regulating assembly. The battery cell assembly is disposed within the first housing and includes multiple battery cells and insulating members. The battery cells are arranged along a first direction, with insulating members disposed between adjacent battery cells. The pressure regulating assembly is disposed between the first housing and the battery cell assembly, and is connected to the first housing. Pressure regulating assemblies are respectively disposed on opposite sides of the battery cell assembly along the first direction, and are configured to controllably apply pressure to the battery cell assembly.

[0005] In the battery device of this application embodiment, pressure regulating components are respectively provided on both sides of the battery cell assembly. When the battery cell assembly expands or contracts, the pressure regulating components on both sides can actively adjust the pressure applied to the battery cell assembly so that the pressure on the battery cell can be kept in a constant pressure state, which is beneficial to maintaining stable electrical performance of the battery device and improving the safety of the battery device.

[0006] In some possible implementations, the pressure regulating assembly includes a fixed part and a movable part, the movable part being movably connected to the fixed part along a first direction, and the battery cell assembly being connected to the movable part.

[0007] By adjusting the relative positions of the moving and fixed parts, the pressure applied to the battery cell assembly can be accurately adjusted, facilitating stepless adjustment of the pressure and improving the accuracy of pressure regulation.

[0008] In some possible implementations, the fixed component includes a chamber with an opening facing the battery cell assembly, a movable component is located within the chamber and is slidably connected to the fixed component along a first direction, with a gap between the movable component and the opening along the first direction, and a portion of the battery cell assembly is located within the chamber.

[0009] The movable component is located within the cavity of the fixed component. The fixed component can limit and constrain the movable component, reducing the possibility of the movable component shifting relative to the fixed component in the direction perpendicular to the first direction, and reducing the possibility of uneven force applied by the movable component to the battery cell assembly due to the shift of the movable component.

[0010] In some possible implementations, the fixed component includes a cylinder body, which includes a chamber and an opening, and the movable component includes a pressure plate located within the cylinder body. Along a first direction, there is a gap between the pressure plate and the opening, and a portion of the battery cell assembly is located within the cylinder body and connected to the pressure plate.

[0011] The surface of the pressure plate facing the battery cell module can be flat, which facilitates the pressure plate to apply even pressure to the battery cell module, reduces the possibility of excessive local pressure in the battery cell module leading to stress concentration, and improves the safety of the battery cell module.

[0012] In some feasible ways, along the first direction, the projected area of ​​the pressure plate is larger than the projected area of ​​the battery cell assembly, and there is a gap between the battery cell assembly and the inner wall of the cylinder.

[0013] Along the first direction, the pressure plate can completely block one side of the battery cell assembly. The pressure plate can apply force to the entire battery cell assembly, ensuring uniform force distribution across all parts of the assembly, reducing the possibility of excessive or insufficient local pressure, and improving the accuracy of pressure regulation for the battery cell assembly.

[0014] In some feasible embodiments, the battery device also includes a one-way input valve and a one-way output valve, which are respectively connected to a fixed component and configured to input and output media into and out of the chamber to change the position of the moving component.

[0015] By setting separate one-way input valves and one-way output valves to regulate the chamber pressure, it is beneficial to improve the pressure regulation accuracy within the chamber, improve the displacement accuracy of moving parts, improve the accuracy of the pressure applied by moving parts to the battery cell assembly, and reduce the possibility of pressure fluctuations and uneven stress on the battery cells during expansion and contraction.

[0016] In some feasible implementations, the battery device also includes a pressure sensor configured to detect the pressure within the chamber.

[0017] By setting up a pressure sensor and through the coordinated operation of the pressure sensor, the one-way input valve, and the one-way output valve, it is beneficial to improve the accuracy of pressure regulation within the chamber and the precision of the pressure applied by the moving parts to the battery cell assembly.

[0018] In some possible implementations, the battery device also includes a support member disposed between the pressure regulating assembly and the first housing along a first direction.

[0019] The support component can provide support for the pressure regulating assembly, and at the same time, the support component can separate the first housing and the pressure regulating assembly, so that the pressure regulating assembly and the first housing are less likely to come into contact and cause friction damage.

[0020] In some possible implementations, the first housing includes an end plate and a side plate, with the end plates respectively disposed on opposite sides of the battery cell assembly along a first direction, the end plates being connected to the side plates, and a pressure regulating assembly disposed between the battery cell assembly and the end plates.

[0021] Along the circumference of the battery cell assembly, end plates and side plates are alternately arranged. In the first direction, the end plates can provide support for the pressure regulating assembly.

[0022] In some feasible implementations, the battery device also includes a second housing, within which the first housing is located.

[0023] The second housing can provide protection for the first housing, battery cell assembly, and pressure regulation assembly, reducing the possibility of structural damage to the first housing, battery cell assembly, and pressure regulation assembly.

[0024] This application provides an electrical device including the battery device described above. The battery device is used to provide electrical energy. Attached Figure Description

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application; Figure 2 This is a partial structural schematic diagram of a battery device provided in an embodiment of this application; Figure 3 This is a partial structural schematic diagram of a battery device provided in one embodiment of the application; Figure 4 This is a partial structural schematic diagram of a battery device provided in an embodiment of this application; Figure 5 This is a partial structural schematic diagram of a battery device provided in an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures: 1. Vehicle; 10. Battery unit; 11. Controller; 12. Motor; 20. Battery cell assembly; 21. Battery cell; 22. Insulating component; 30. First shell; 31. End plate; 32. Side plate; 40. Pressure regulating assembly; 41. Fixed component; 41a. Cylinder; 411. Chamber; 412. Opening; 42. Moving component; 42a. Pressure plate; 50. One-way input valve; 60. One-way output valve; 70. Pressure sensor; 80. Supporting components; 90. Medium pipeline; 100. Second shell; X, the first direction. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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 used 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 the application areas of battery devices, the market demand is also constantly increasing.

[0034] In this application, the battery cell may include a lithium-ion secondary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc., and the embodiments of this application are not limited thereto. The battery cell may be flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto. In this application, the battery cell may be a pouch cell or a hard-case cell.

[0035] The battery device mentioned in the embodiments of this application refers to a physical module that includes one or more battery cells to provide higher voltage and capacity. The battery device mentioned in this application can be a battery pack. For example, the battery device mentioned in this application can include battery cell assemblies, etc.

[0036] A single battery cell includes an electrode assembly. The electrode assembly consists of a positive electrode and a negative electrode. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates.

[0037] The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive current collector portion and a positive electrode tab connected to the positive current collector portion. The positive current collector portion is coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum. The positive active material layer includes the positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0038] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative current collector includes a negative current collection section and a negative electrode tab connected to the negative current collection section. The negative current collection section is coated with the negative active material layer. The material of the negative current collector can be copper. The negative active material layer includes the negative active material. The negative active material can be carbon or silicon, etc.

[0039] An electrode assembly is the component in a battery cell where electrochemical reactions occur. An electrode assembly includes a positive electrode, a negative electrode, and an interlayer dielectric layer. An interlayer dielectric layer is disposed between the positive and negative electrode. In some examples, the interlayer dielectric layer may include a solid electrolyte layer. When the electrode assembly formed by stacking the positive electrode, solid electrolyte layer, and negative electrode is applied to a battery cell, the battery cell is a solid-state battery, thus eliminating the need for liquid electrolyte filling within the battery cell. Exemplarily, the solid electrolyte layer may be a sulfide-based solid electrolyte, an oxide-based solid electrolyte, or a polymer-based solid electrolyte.

[0040] During the manufacturing process of the electrode assembly, the positive electrode, solid electrolyte layer, and negative electrode are stacked and pressed to ensure tight contact between each layer of the positive electrode, solid electrolyte layer, and negative electrode.

[0041] For example, the positive and negative electrode plates each have a main body portion. The portions of the positive and negative electrode plates extending from the main body portion constitute tabs. The positive and negative tabs may be located together at one end of the main body portion or separately at both ends of the main body portion. During the charging and discharging process of the battery, the positive and negative active materials undergo an electrochemical reaction with the solid electrolyte layer, and the tabs connect to the electrode terminals to form a current loop.

[0042] In related technologies, battery cell assemblies include individual battery cells. Battery cells are relatively sensitive to external pressure; excessive or insufficient external pressure can affect cell performance and safety. During use, battery cell assemblies experience expansion and contraction, such as during charging and discharging. Currently, buffer pads are used between adjacent battery cells to absorb the tolerances during expansion and contraction, thus stabilizing the pressure on the battery cells. However, after long-term use, these buffer pads undergo creep and aging, rendering them unable to absorb the tolerances during expansion and contraction. The creep relaxation characteristics of the buffer pads lead to uneven stress on the battery cells, causing problems such as increased local current density, uneven lithium deposition, deteriorated interfacial contact, and accelerated electrochemical performance degradation, thereby affecting the performance and safety of the battery device. To address these issues, elastic elements (such as springs) are used to constrain the battery cells. The compression or rebound of the elastic element itself absorbs the tolerances during expansion and contraction, stabilizing the pressure on the battery cells. However, while this elastic element improves the situation, it cannot achieve active pressure regulation, leaving the battery cells with uneven stress and unable to maintain constant pressure.

[0043] To alleviate the problem of uneven stress on individual battery cells, a pressure regulating component can be used to apply controllable pressure to the battery cells, thereby achieving a constant pressure state for the battery cells.

[0044] Based on the above considerations, in order to alleviate the problem of uneven stress on individual battery cells, the inventors, after in-depth research, designed a battery device. In this battery device, pressure regulating components are respectively arranged on both sides of the battery cell assembly. The pressure regulating components can actively adjust the pressure on the battery cells to facilitate balanced stress on the battery cells, maintain a constant pressure state, and improve the performance stability and safety of the battery device.

[0045] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices using battery devices.

[0046] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers. This application does not impose any special limitations on the above-mentioned electrical devices.

[0047] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical devices described above, but can also be applied to all battery devices including housings and electrical devices using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0048] See Figure 1 As shown, vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1. The battery device 10 can be located at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1. Vehicle 1 may also include a controller 11 and a motor 12. The controller 11 is used to control the battery device 10 to supply power to the motor 12. For example, this is for the power needs of vehicle 1 during starting, navigation, and driving.

[0049] In some embodiments of this application, the battery device 10 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0050] To meet different power demands, the battery device 10 may include multiple battery cells. A battery cell is the smallest unit that makes up a battery cell assembly or battery pack. Multiple battery cells can be connected in series and / or in parallel via electrode terminals for various applications. The battery device mentioned in this application includes battery cell assemblies or battery packs. Multiple battery cells can be connected in series, in parallel, or in a mixed configuration. A mixed configuration refers to a combination of series and parallel connections. In the embodiments of this application, multiple battery cells can be directly assembled into a battery pack, or they can first be assembled into battery cell assemblies, and then the battery cell assemblies can be assembled into a battery pack.

[0051] See Figures 2 to 4 As shown in some embodiments of this application, a battery device 10 is provided, which includes a first housing 30, a battery cell assembly 20, and a pressure regulating assembly 40.

[0052] A battery cell assembly 20 is disposed within a first housing 30. The battery cell assembly 20 includes multiple battery cells 21 and insulating members 22. The battery cells 21 are arranged along a first direction X, and an insulating member 22 is disposed between two adjacent battery cells 21. A pressure regulating assembly 40 is disposed between the first housing 30 and the battery cell assembly 20. The pressure regulating assembly 40 is connected to the first housing 30. Pressure regulating assemblies 40 are respectively disposed on opposite sides of the battery cell assembly 20 along the first direction X. The pressure regulating assemblies 40 are configured to controllably apply pressure to the battery cell assembly 20.

[0053] The first housing 30 can provide protection for the battery cell assembly 20 from the outside. The first housing 30 can simultaneously provide support and constraint for both the pressure regulating assembly 40 and the battery cell assembly 20.

[0054] The pressure regulating component 40 can actively adjust according to the stress state of the battery cell assembly 20, thereby controlling the application of pressure to the battery cell assembly 20. When the pressure on the battery cell assembly 20 is too high, the pressure regulating component 40 can reduce the pressure applied to the battery cell assembly 20; when the pressure on the pressure regulating component 40 is too low, the pressure regulating component 40 can increase the pressure applied to the battery cell assembly 20, so as to keep the battery cell assembly 20 in a constant pressure state.

[0055] When the battery cell assembly 20 is charging, the battery cell 21 will expand, causing the entire battery cell assembly 20 to expand and the pressure on the battery cell 21 to increase. When the battery cell assembly 20 is discharging, the battery cell 21 will contract, causing the entire battery cell assembly 20 to contract and the pressure on the battery cell 21 to decrease.

[0056] During charging, the pressure regulating component 40 reduces the pressure applied to the battery cell assembly 20 to release the overall expansion force of the battery cell assembly 20 and reduce the pressure on the battery cell 21, so as to help the battery cell 21 maintain a constant pressure state.

[0057] During discharge, the pressure regulating component 40 increases the pressure applied to the battery cell assembly 20 to compensate for the overall shrinkage of the battery cell assembly 20, thereby increasing the pressure on the battery cell 21 to help the battery cell 21 maintain a constant pressure state.

[0058] In the battery device 10 of this application embodiment, pressure regulating components 40 are respectively provided on both sides of the battery cell assembly 20. When the battery cell assembly 20 expands or contracts, the pressure regulating components 40 on both sides can actively adjust the pressure applied to the battery cell assembly 20 so that the pressure on the battery cell 21 can be kept in a constant pressure state, which is beneficial to the battery device 10 maintaining stable electrical performance and improving the safety of the battery device 10.

[0059] When the individual battery cells 21 in the battery cell assembly 20 expand or contract, the amount of expansion or contraction at both ends of the battery cell assembly 20 along the first direction X is different. In this embodiment, pressure regulating components 40 are respectively provided on both sides of the battery cell assembly 20, so that the pressure regulating components 40 on both sides can independently adjust the pressure according to the amount of expansion or contraction at both ends of the battery cell assembly 20, which is beneficial to improving the adjustment accuracy.

[0060] See also some of the possible implementation methods. Figure 2 and Figure 3 As shown, the pressure regulating assembly 40 includes a fixed part 41 and a movable part 42. The movable part 42 is movably connected to the fixed part 41 along a first direction X, and the battery cell assembly 20 is connected to the movable part 42.

[0061] The fixed component 41 supports the movable component 42. The fixed component 41 can be connected to the first housing 30. By adjusting the relative position of the movable component 42 and the fixed component 41, the pressure applied to the battery cell assembly 20 can be accurately adjusted, which facilitates stepless adjustment of the pressure and improves the accuracy of pressure adjustment.

[0062] When the battery cell assembly 20 expands, the movable part 42 moves relative to the fixed part 41 to reduce the pressure exerted by the movable part 42 on the battery cell assembly 20.

[0063] When the battery cell assembly 20 contracts, the movable part 42 moves relative to the fixed part 41 to increase the pressure exerted by the movable part 42 on the battery cell assembly 20.

[0064] In some examples, the battery cell assembly 20 abuts against the moving part 42, and no additional connection structure is required between the battery cell assembly 20 and the moving part 42.

[0065] In some examples, the battery cell assembly 20 is bonded to the movable part 42, and the battery cell assembly 20 and the movable part 42 are mutually constrained to reduce the positional displacement of the battery cell assembly 20 relative to the movable part 42 in the direction perpendicular to the first direction X.

[0066] In some examples, an insulating element 22 is provided on the outside of the battery cell assembly 20, and the insulating element 22 is connected to the moving part 42.

[0067] See also some of the possible implementation methods. Figure 3 and Figure 4 As shown, the fixed component 41 includes a chamber 411 with an opening 412 facing the battery cell assembly 20. A movable component 42 is located within the chamber 411 and is slidably connected to the fixed component 41 along a first direction X. A gap exists between the movable component 42 and the opening 412 along the first direction X. A portion of the battery cell assembly 20 is located within the chamber 411 and connected to the movable component 42.

[0068] The position adjustment of the movable component 42 is achieved by inputting or outputting a medium into or out of the chamber 411 of the fixed component 41. When the battery cell assembly 20 expands, the chamber 411 of the fixed component 41 outputs a medium to reduce the pressure in the chamber 411, and the movable component 42 slides within the chamber 411. The pressure exerted by the movable component 42 on the battery cell assembly 20 is reduced, so as to help the battery cell 21 maintain a constant pressure.

[0069] When the battery cell assembly 20 contracts, the chamber 411 of the fixed component 41 is supplied with a medium to increase the pressure in the chamber 411. The movable component 42 slides in the chamber 411, and the pressure applied by the movable component 42 to the battery cell assembly 20 increases, so as to keep the pressure on the battery cell 21 constant.

[0070] The movable component 42 is located entirely within the chamber 411 of the fixed component 41. The fixed component 41 can limit the movable component 42, reducing the possibility that the movable component 42 will shift relative to the fixed component 41 in the direction perpendicular to the first direction X, and reducing the possibility that the movable component 42 will exert uneven force on the battery cell assembly 20 due to the shift of the movable component 42.

[0071] The movable part 42 is located entirely within the chamber 411 of the fixed part 41. The fixed part 41 can protect the movable part 42 and reduce the possibility of the movable part 42 being deformed by compression or collision.

[0072] In some examples, the medium input or output into the chamber 411 of the fixed component 41 can be a gaseous substance. The gaseous substance itself is lightweight, which helps to reduce the adverse effects on the energy density of the battery device 10.

[0073] In some examples, the medium input to or output to the chamber 411 of the stationary component 41 can be a liquid substance, such as ultrapure water or fluorinated liquid.

[0074] See in some examples Figure 4 As shown, the fixed component 41 includes a cylinder 41a, which includes a chamber 411 and an opening 412. The movable component 42 includes a pressure plate 42a, which is located inside the cylinder 41a. Along the first direction X, there is a gap between the pressure plate 42a and the opening 412. A portion of the battery cell assembly 20 is located inside the cylinder 41a and connected to the pressure plate 42a.

[0075] When the pressure inside the chamber 411 of the cylinder 41a changes, the position of the pressure plate 42a inside the chamber 411 is actively adjusted, thereby adjusting the pressure of the battery cell assembly 20 by adjusting the position of the pressure plate 42a when the battery cell assembly 20 expands or contracts.

[0076] When the battery cell assembly 20 expands, the pressure inside the chamber 411 decreases, and the pressure plate 42a moves away from the opening 412 of the chamber 411. When the battery cell assembly 20 contracts, the pressure inside the chamber 411 increases, and the pressure plate 42a moves closer to the opening 412 of the chamber 411.

[0077] The surface of the pressure plate 42a facing the battery cell assembly 20 can be flat, so that the pressure plate 42a can apply balanced pressure to the battery cell assembly 20, reduce the possibility of excessive local pressure in the battery cell assembly 20 leading to stress concentration, and improve the safety of the battery cell assembly 20.

[0078] In some examples, along the first direction X, the projected area of ​​the pressure plate 42a is larger than the projected area of ​​the battery cell assembly 20, and there is a gap between the battery cell assembly 20 and the inner wall of the cylinder 41a. There is also a gap between the edges of the battery cell assembly 20 and the pressure plate 42a.

[0079] Along the first direction X, the pressure plate 42a can completely block the battery cell assembly 20 on one side. The pressure plate 42a can apply force to the entire battery cell assembly 20, so that the force is evenly distributed at all positions of the battery cell assembly 20, reducing the possibility of excessive or insufficient local pressure and improving the pressure regulation accuracy of the battery cell assembly 20.

[0080] When the battery cell assembly 20 expands, it may also expand in the direction perpendicular to the first direction X. There is a gap between the battery cell assembly 20 and the inner wall of the cylinder 41a, so that when the battery cell assembly 20 expands, it will not come into contact with the cylinder 41a. This reduces the possibility that the cylinder 41a will squeeze the battery cell 21 due to contact between the battery cell assembly 20 and the cylinder 41a, reduces the possibility of damage or rupture due to compression of the battery cell 21, and improves the safety of the battery cell assembly 20.

[0081] The gap between the battery cell assembly 20 and the inner wall of the cylinder 41a is greater than the maximum expansion amount of the battery cell assembly 20 when it expands in a direction perpendicular to the first direction X.

[0082] For example, the cylinder 41a has a rectangular cross-section, and the pressure plate 42a can also be rectangular. The thickness direction of the pressure plate 42a is the same as the first direction X. The length of the pressure plate 42a is greater than the length of the battery cell 21, the width of the pressure plate 42a is greater than the width of the battery cell 21, and there is a gap between the four edges of the battery cell assembly 20 and the pressure plate 42a.

[0083] See also some of the possible implementation methods. Figure 3 and Figure 4As shown, the battery device 10 also includes a one-way input valve 50 and a one-way output valve 60. The one-way input valve 50 and the one-way output valve 60 are respectively connected to the fixed component 41, and the one-way input valve 50 and the one-way output valve 60 are respectively configured to input and output media into the chamber 411 to change the position of the movable component 42.

[0084] The medium can be introduced into the chamber 411 through the one-way input valve 50 to increase the pressure in the chamber 411. The medium in the chamber 411 cannot flow in the reverse direction through the one-way input valve 50.

[0085] The medium can be discharged from the chamber 411 through the one-way output valve 60 to reduce the pressure in the chamber 411. The medium in the chamber 411 cannot flow in the reverse direction through the one-way output valve 60.

[0086] When the battery cell assembly 20 expands, the one-way input valve 50 is in the closed state and the one-way output valve 60 is in the open state. The medium in the chamber 411 is discharged through the one-way output valve 60. The movable part 42 moves away from the opening 412 of the chamber 411 to release the battery cell assembly 20, reduce the pressure of the movable part 42 on the battery cell assembly 20, and reduce the pressure on the battery cell 21 itself, so that the pressure on the battery cell 21 during expansion is consistent with the pressure on the battery cell 21 in the initial state, and the battery cell 21 is in a constant pressure state.

[0087] When the battery cell assembly 20 contracts, the one-way output valve 60 is in the closed state and the one-way input valve 50 is in the open state. The medium is introduced into the chamber 411 through the one-way input valve 50. The movable part 42 moves close to the opening 412 of the chamber 411 to compensate for the contraction of the battery cell assembly 20, increase the pressure of the movable part 42 on the battery cell assembly 20, and increase the pressure on the battery cell 21 itself, so as to keep the pressure on the battery cell 21 during contraction consistent with the pressure on the battery cell 21 in the initial state, and realize the constant pressure state of the battery cell 21.

[0088] By setting separate one-way input valve 50 and one-way output valve 60 to regulate the pressure in chamber 411, it is beneficial to improve the pressure regulation accuracy in chamber 411, improve the displacement accuracy of moving part 42, improve the accuracy of moving part 42 in applying pressure to battery cell assembly 20, and reduce the possibility of pressure fluctuation and uneven force on battery cell 21 during expansion and contraction.

[0089] In some examples, the one-way input valve 50 may be located inside or outside the first housing 30. The one-way output valve 60 may be located inside or outside the first housing 30.

[0090] In some examples, each fixed component 41 can be individually configured with a one-way input valve 50 and a one-way output valve 60.

[0091] See in some examples Figure 3 and Figure 4 As shown, the battery device 10 also includes a pressure sensor 70, which is configured to detect the pressure inside the chamber 411.

[0092] In the initial state where the battery cell assembly 20 has not expanded or contracted, the pressure detected by the pressure sensor 70 in the chamber 411 is the initial pressure.

[0093] When the battery cell assembly 20 expands or contracts, the pressure sensor 70 detects that the pressure in the chamber 411 deviates from the initial pressure. Then, the one-way input valve 50 or the one-way output valve 60 is opened to adjust the pressure in the chamber 411 so that the pressure in the chamber 411 returns to the initial pressure.

[0094] By setting up a pressure sensor 70 and through the coordinated operation of the pressure sensor 70, the one-way input valve 50 and the one-way output valve 60, it is beneficial to improve the accuracy of pressure regulation in the chamber 411 and improve the accuracy of the pressure applied by the moving part 42 to the battery cell assembly 20.

[0095] In some examples, the battery device 10 also includes a controller (not shown). The controller is electrically connected to the pressure sensor 70, the one-way input valve 50, and the one-way output valve 60. The controller can receive the pressure signal detected by the pressure sensor 70 and control the one-way input valve 50 and the one-way output valve 60 to control the pressure regulating assembly 40. Exemplarily, the controller may be located outside the first housing 30.

[0096] See in some examples Figure 3 As shown, the battery device 10 also includes a support member 80, which is disposed between the pressure regulating assembly 40 and the first housing 30 along the first direction X.

[0097] The support component 80 can provide support for the pressure regulating component 40, and at the same time, the support component 80 can separate the first housing 30 and the pressure regulating component 40, so that the pressure regulating component 40 and the first housing 30 are less likely to come into contact and cause friction damage.

[0098] In some examples, the fixing member 41 includes a cylinder 41a. Along the first direction X, a support member 80 is disposed between the cylinder 41a and the first housing 30.

[0099] For example, along the first direction X, the projection of the support member 80 is located within the projection of the cylinder body 41a. For example, the support member 80 is a support plate.

[0100] In some examples, the support member 80 and the pressure regulating assembly 40 are bonded together. The support member 80 and the first housing 30 are also bonded together.

[0101] In some examples, the material of the support component 80 may be plastic, such as, but not limited to, polyurethane.

[0102] See also some of the possible implementation methods. Figure 3 As shown, the first housing 30 includes an end plate 31 and a side plate 32. Along the first direction X, the end plates 31 are respectively provided on opposite sides of the battery cell assembly 20. The end plates 31 are connected to the side plates 32. The pressure regulating assembly 40 is disposed between the battery cell assembly 20 and the end plates 31.

[0103] Along the circumference of the battery cell assembly 20, end plates 31 and side plates 32 are alternately arranged. In the first direction X, the end plate 31 can provide support for the pressure regulating assembly 40.

[0104] See in some examples Figure 3 and Figure 4 As shown, the battery device 10 includes a medium conduit 90 connected to the fixing component 41. The medium conduit 90 can pass through the side plate 32, and a seal is provided between the medium conduit 90 and the side plate 32. A one-way input valve 50 and a one-way output valve 60 are respectively provided on the corresponding medium conduit 90. A pressure sensor 70 can detect the pressure state inside the chamber 411 through the medium conduit 90.

[0105] In some examples, end plate 31 and side plate 32 are detachably connected. Alternatively, end plate 31 and side plate 32 are welded together.

[0106] See also some of the possible implementation methods. Figure 5 As shown, the battery device 10 also includes a second housing 100, and the first housing 30 is located inside the second housing 100.

[0107] The second housing 100 can provide protection for the first housing 30, the battery cell assembly 20 and the pressure regulating assembly 40, reducing the possibility of structural damage to the first housing 30, the battery cell assembly 20 and the pressure regulating assembly 40.

[0108] In some examples, the second housing 100 may house multiple rows of battery cell assemblies 20, as well as a corresponding number of first housings 30 and pressure regulating assemblies 40.

[0109] In some examples, the second housing 100 can be a sealed, complete housing structure. The first housing 30 can be a cylindrical structure with an upper opening and a lower opening. For example, the first housing 30 may include an end plate 31 and a side plate 32, which are connected to form a cylindrical structure.

[0110] In some examples, the electrical device can be vehicle 1. The battery device 10 can be connected to the chassis structure of vehicle 1 via a second housing 100.

[0111] In some examples, the pressure sensor 70 may be located inside or outside the second housing 100.

[0112] This application also provides an electrical device, including a battery device 10 according to any of the above embodiments, and the battery device 10 is used to provide electrical energy to the electrical device. The electrical device can be any of the aforementioned devices or systems that utilize the battery device 10.

[0113] 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: First shell; A battery cell assembly is disposed within the first housing. The battery cell assembly includes multiple battery cells and an insulating component. The battery cells are arranged along a first direction, and the insulating component is disposed between two adjacent battery cells. A pressure regulating component is disposed between the first housing and the battery cell assembly. The pressure regulating component is connected to the first housing. Along the first direction, the pressure regulating components are respectively disposed on opposite sides of the battery cell assembly. The pressure regulating component is configured to controllably apply pressure to the battery cell assembly.

2. The battery device according to claim 1, characterized in that, The pressure regulating assembly includes a fixed component and a movable component, wherein the movable component is movably connected to the fixed component along the first direction. The battery cell assembly is connected to the moving part.

3. The battery device according to claim 2, characterized in that, The fixing component includes a chamber with an opening facing the battery cell assembly. The movable component is located within the cavity and is slidably connected to the fixed component along the first direction. A gap exists between the movable component and the opening along the first direction. Part of the battery cell assembly is located within the cavity.

4. The battery device according to claim 3, characterized in that, The fixing component includes a cylinder body, which includes the chamber and the opening. The movable component includes a pressure plate located within the cylinder body, and a distance is provided between the pressure plate and the opening along the first direction. Part of the battery cell assembly is located inside the cylinder and connected to the pressure plate.

5. The battery device according to claim 4, characterized in that, Along the first direction, the projected area of ​​the pressure plate is larger than the projected area of ​​the battery cell assembly. There is a gap between the battery cell assembly and the inner wall of the cylinder.

6. The battery device according to any one of claims 3 to 5, characterized in that, The battery device also includes a one-way input valve and a one-way output valve. The one-way input valve and the one-way output valve are respectively connected to the fixed component. The one-way input valve and the one-way output valve are respectively configured to input and output media into and out of the chamber, so as to change the position of the moving part.

7. The battery device according to any one of claims 3 to 5, characterized in that, The battery device also includes a pressure sensor. The pressure sensor is configured to detect the pressure within the chamber.

8. The battery device according to any one of claims 1 to 5, characterized in that, The battery device also includes a support component. Along the first direction, the support member is disposed between the pressure regulating assembly and the first housing.

9. The battery device according to any one of claims 1 to 5, characterized in that, The first housing includes an end plate and a side plate. Along the first direction, end plates are respectively disposed on opposite sides of the battery cell assembly, and the end plates are connected to the side plates. The pressure regulating component is disposed between the battery cell assembly and the end plate.

10. The battery device according to any one of claims 1 to 5, characterized in that, The battery device further includes a second housing, with the first housing located inside the second housing.

11. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1 to 10, the battery device being used to provide electrical energy.

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