Battery device and electric device

Abstract

The application provides a battery device and a power utilization device. The battery device comprises a box body having a containing cavity, wherein the box body comprises at least one structural beam; at least one battery cell contained in the containing cavity; at least one structural beam located at the side of the battery cell along a first direction, and the interior of the structural beam has a cavity; and a pressure sensor arranged in the cavity, wherein at least one side of the pressure sensor along the first direction can be in contact with the battery cell, or at least one side of the pressure sensor along the first direction can be in contact with the structural beam, and the pressure sensor is used for detecting the expansion force of the battery cell along the first direction. The battery device provided by the application is beneficial to improving the reliability and energy density of the battery device.

Description

Technical Field

[0001] This application relates to battery technology, and more particularly to a battery device and an electrical device. Background Technology

[0002] Battery devices are being used more and more widely in daily life and industry. For example, new energy vehicles equipped with battery devices are now widely used.

[0003] In the development of battery devices, in addition to improving their reliability, energy density is also a crucial consideration. How to increase the energy density of battery devices is a technical problem that those skilled in the art are continuously working to improve. Utility Model Content

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

[0005] In a first aspect, the battery device provided in the embodiments of this application includes: a housing having a receiving cavity, the housing including at least one structural beam; at least one battery cell being housed within the receiving cavity; at least one structural beam located on the side of the battery cell along a first direction, the structural beam having a cavity inside; and a pressure sensor disposed within the cavity, wherein at least one side of the pressure sensor along the first direction is capable of contacting the battery cell, or at least one side of the pressure sensor along the first direction is capable of contacting the structural beam, the pressure sensor being used to detect the expansion force of the battery cell along the first direction.

[0006] The battery device provided in this application embodiment, by placing at least one pressure sensor inside the cavity of the structural beam, can detect the magnitude of the expansion force of the battery cell along the first direction. This improves the accuracy of the pressure sensor in detecting the expansion force of the battery cell, allowing the battery management system or external control components to more accurately assess the battery device's condition, provide thermal runaway warnings, and predict its lifespan based on the detected expansion force of the battery cell. This improves the reliability of the battery device, reduces the additional space occupied by the pressure sensor within the housing, and increases the energy density of the battery device.

[0007] In some embodiments, the battery cell includes a housing and an electrode assembly, the electrode assembly being housed within the housing. The housing includes two first surfaces opposite each other along a first direction and two second surfaces opposite each other along a second direction, the first surfaces connecting the two second surfaces. The electrode assembly includes an electrode body and a tab, the tab extending from an end of the electrode body along a third direction. The first direction, the second direction, and the third direction intersect each other but are not coplanar. The projected area of ​​the electrode body along the first direction on the first surface is greater than the projected area of ​​the electrode assembly along the second direction on the second surface.

[0008] In the above embodiments, the magnitude of the expansion force in the direction of the large expansion deformation of the battery cell is detected by the pressure sensor, which helps to improve the accuracy of the expansion force measurement and makes it easier for the battery management system or external control components of the battery device to more accurately perform state assessment, thermal runaway early warning and life prediction of the battery device based on the magnitude of the expansion force.

[0009] In some embodiments, the battery device includes a battery cell assembly, which includes a plurality of battery cells arranged along a first direction, and at least one structural beam is disposed on at least one side of the battery cell assembly along the first direction.

[0010] In the above embodiments, the structural beam located on at least one side of the battery cell assembly along the first direction can not only limit the expansion of the battery cell, but also provide a certain structural strength for the housing, thereby improving the overall load-bearing capacity of the housing. Furthermore, during assembly, the structural beam can be installed using part of the space in the housing wall, which helps to reduce the space occupied by the structural beam inside the battery device, thereby increasing the energy density of the battery device.

[0011] In some embodiments, at least one structural beam is provided with a first battery cell assembly and a second battery cell assembly on both sides along a first direction, and the first battery cell assembly and the second battery cell assembly each include a plurality of battery cells arranged along the first direction.

[0012] In the above embodiments, the structural beam can limit the expansion and deformation of the battery cells on both sides along the first direction, thereby improving the limiting effect of the structural beam on the expansion and deformation of the battery cells and improving the reliability and energy density of the battery device. Furthermore, the pressure sensor can detect the expansion force of battery cells with larger expansion forces. These battery cells with larger expansion and deformation have a more significant impact on the operating state, lifespan, and occurrence of thermal runaway of the battery device, thus facilitating more accurate state assessment, thermal runaway early warning, and lifespan prediction of the battery device.

[0013] In some embodiments, the absolute value of the difference in the number of battery cells between the first battery cell assembly and the second battery cell assembly is less than or equal to 20.

[0014] In the above embodiment, the structural beam provides better restriction of expansion for multiple battery cells on both sides of the first direction, and the pressure sensor can detect the expansion force of the battery cells with greater expansion and deformation in the battery device. These battery cells with greater expansion and deformation have a more important impact on the working state, lifespan and occurrence of thermal runaway of the battery device, so as to more accurately assess the state of the battery device, provide early warning of thermal runaway and predict the lifespan.

[0015] In some embodiments, the structural beam includes a first part and a second part, at least a portion of which are spaced apart along a first direction and form a cavity, wherein a pressure sensor is sandwiched between the first part and the second part along the first direction.

[0016] In the above embodiments, it is beneficial to reduce the assembly process of the pressure sensor and the structural beam. Furthermore, by setting at least a portion of the first and second parts to be spaced apart along the first direction, the first and second parts are more sensitive to the micro-deformation generated under the expansion force of the battery cell. This allows for more sensitive transmission of the expansion deformation or expansion force of the battery cell to the pressure sensor, improving the accuracy of the pressure sensor in detecting the expansion force of the battery cell.

[0017] In some embodiments, the first part includes a first plate and a first limiting member, the first limiting member being connected to at least one end of the first plate along a third direction, the third direction intersecting the first direction. The second part includes a second plate and a second limiting member, the second limiting member being connected to at least one end of the second plate along a third direction. A pressure sensor is sandwiched between the first plate and the second plate, at least a portion of the first limiting member and at least a portion of the second limiting member being located on the side of the pressure sensor along the third direction.

[0018] In the above embodiments, during the battery assembly process, the installation convenience of the pressure sensor and the structural beam is improved. Furthermore, when the battery cell expands, the first and second plates are more sensitive to expansion deformation or expansion force, allowing for more accurate transmission of the expansion deformation or expansion force to the pressure sensor, thus improving the accuracy of the pressure sensor's detection of the battery cell's expansion force. The first and second limiting members can provide a certain degree of protection for the pressure sensor along a third direction, reducing the risk that the pressure sensor's accuracy in detecting expansion force may be affected by external forces along that direction.

[0019] In some embodiments, at least one first limiting member and at least one second limiting member are located on the same side of the pressure sensor along a third direction. The first limiting member has a guide groove on the side facing the second limiting member along a first direction. A portion of the second limiting member along the first direction is disposed in the guide groove and spaced apart from the bottom wall of the guide groove.

[0020] In the above embodiments, under the action of the expansion force of the battery cell, the first limiting member and the second limiting member can generate relative movement along the first direction under the guidance of the guide groove, without generating relative movement in other directions intersecting the first direction. This facilitates the first part and the second part to transmit the expansion deformation or expansion force of the battery cell along the first direction to the pressure sensor more accurately, reducing the risk that the first part or the second part will generate relative movement along the first direction, which may affect the accuracy of the expansion force or expansion deformation transmitted to the pressure sensor.

[0021] In some embodiments, the battery device further includes a connector, with the first limiting member and the second limiting member located on the same side of the pressure sensor along a third direction, and the connector connecting the first limiting member, the second limiting member, and the wall of the housing.

[0022] In the above embodiments, connecting the first limiting member and the second limiting member to the wall of the housing through the connecting member is beneficial to improving the overall rigidity of the structural beam, thereby improving the limiting effect of the structural beam on the expansion deformation of the battery cells, and further improving the reliability of the battery device.

[0023] In some embodiments, one of the first plate and the second plate has a third limiting member and the other has a limiting recess, the third limiting member extending along a first direction and inserted into the limiting recess.

[0024] In the above embodiments, during the assembly of the battery device, the cooperation of the third limiting member and the limiting recess provides a certain positioning and guiding effect for the relative positions of the first plate and the second plate, facilitating the assembly and proper engagement of the first and second parts. After the battery device is assembled, the cooperation of the third limiting member and the limiting recess provides a certain limiting effect for the first plate and the second plate, intersecting with the first direction, so that the first plate and the second plate can only generate relative displacement along the first direction. This allows the expansion deformation or expansion force generated by the battery cell to be more accurately transmitted to the pressure sensor via the first plate and the second plate, further improving the accuracy of the expansion force of the battery cell detected by the pressure sensor.

[0025] In some embodiments, at least one of the first and second parts has a clearance groove, and at least a portion of the pressure sensor is disposed within the clearance groove.

[0026] In the above embodiments, during the battery assembly process, the pressure sensor can be positioned using clearance grooves, improving the ease of assembling the pressure sensor, the first part, and the second part. After the battery assembly is completed, the clearance grooves in the first part and / or the second part can provide a certain limiting effect on the pressure sensor, reducing the risk that the pressure sensor may displace in other directions intersecting the first direction, thus affecting the accuracy of the expansion force detected by the pressure sensor.

[0027] In some embodiments, the battery device includes at least two battery cell assemblies arranged along a second direction, each battery cell assembly comprising a plurality of battery cells arranged along a first direction, the first direction intersecting the second direction. The battery device also includes at least two pressure sensors, each pressure sensor corresponding to one of the battery cell assemblies arranged along the second direction.

[0028] In the above embodiments, multiple pressure sensors are used to obtain the expansion force of battery cells in different battery cell assemblies along the second direction inside the battery device. By using the expansion force information of multiple battery cells arranged along the second direction, the battery device can be more accurately assessed. The pressure sensors can detect the expansion force of battery cells with large expansion forces. These battery cells with large expansion deformation have a more significant impact on the operating state, lifespan, and occurrence of thermal runaway of the battery device, so as to more accurately assess the state of the battery device, provide early warning of thermal runaway, and predict the lifespan.

[0029] In some embodiments, the casing of the battery cell has a first surface on one side along a first direction, at least one pressure sensor has a first projection on the first surface along the first direction, the minimum distances between the first projection and the first surface on both sides along a second direction are d1 and d2 respectively, |d1-d2|≤3mm; and / or, the minimum distances between the first projection and the first surface on both sides along a third direction are h1 and h2 respectively, |h1-h2|≤3mm, the first direction, the second direction and the third direction intersect each other and are not coplanar.

[0030] In the above embodiments, the pressure sensor detects the expansion force generated by the electrode assembly or the expansion force of the area with large expansion deformation, which helps to improve the accuracy of the expansion force detected by the pressure sensor, so as to more accurately assess the state of the battery device, provide early warning of thermal runaway, and predict the life of the battery through the expansion force of the battery cells.

[0031] In some embodiments, the battery device further includes a battery management system and conductive wires electrically connecting the battery management system to a pressure sensor. At least a portion of the conductive wires is located inside the structural beam, or on the side of the structural beam along a third direction that intersects the first direction.

[0032] In the above embodiments, by setting at least a portion of the conductive wire inside the structural beam, or on the side of the structural beam along a third direction, it is beneficial to reduce the additional space occupied by the conductive wire inside the battery device along the first direction, and further beneficial to improve the energy density of the battery device.

[0033] In some embodiments, the battery device further includes a signal processing module and a battery management system, the signal processing module being located on the structural beam and electrically connected to the pressure sensor and the battery management system.

[0034] In the above embodiments, the signal processing module can be used to amplify, filter, and perform analog-to-digital conversion on the raw signal collected by the pressure sensor, and transmit it to the battery management system. This facilitates signal transmission and enables the battery management system or the control unit outside the battery device to more accurately assess the battery device's condition, provide early warning of thermal runaway, and predict its lifespan.

[0035] In some embodiments, along the first direction, the thicknesses e1 and e2 of the portions of the structural beam located on both sides of the pressure sensor satisfy: 5mm≤e1≤10mm, 5mm≤e2≤10mm, respectively.

[0036] In the above embodiment, by setting the thicknesses e1 and e2 of the portions of the structural beam located on both sides of the pressure sensor to satisfy 5mm≤e1≤10mm and 5mm≤e2≤10mm respectively, it is beneficial to improve the stiffness of the structural beam, thereby enhancing the limiting effect of the structural beam on the expansion deformation of the battery cells, thus improving the energy density of the battery device, and reducing the space occupied by the structural beam in the cavity, which is also beneficial to improving the energy density of the battery device.

[0037] Secondly, the electrical device provided in the embodiments of this application includes the battery device provided in any of the above embodiments, and the battery device is used to provide electrical energy.

[0038] The power device provided in this application embodiment has the same technical effect as the battery device provided in any of the above embodiments, and will not be described again here. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the vehicle structure provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a battery cell assembly in a battery device provided in an embodiment of this application; Figure 4 This application provides an exploded structural diagram of a single battery cell in a battery device for embodiments of the present application; Figure 5 This is a schematic diagram of another battery device provided in an embodiment of this application; Figure 6 A partial enlarged view of the battery device provided in the embodiments of this application; Figure 7 for Figure 6 A schematic diagram of a cross-sectional structure along AA; Figure 8 for Figure 6 Another sectional view of the structure along AA; Figure 9 for Figure 8 A magnified view of a section at point B in the middle; Figure 10 for Figure 6 Another sectional view of the structure along AA; Figure 11 An exploded view of the structural beams and pressure sensors in the battery device provided in this application embodiment; Figure 12 Another exploded view of the structural beams and pressure sensors in the battery device provided in the embodiments of this application; Figure 13 This is a schematic diagram of the structure of a pressure sensor in a battery device provided in an embodiment of this application; Figure 14 A projection view of a pressure sensor on a first surface in a battery device provided in an embodiment of this application; Figure 15 This is a projection view of the first surface of another pressure sensor in the battery device provided in an embodiment of this application.

[0040] The accompanying drawings are not necessarily drawn to scale.

[0041] Explanation of reference numerals in the attached figures: 1. Vehicle; 1a. Motor; 1b. Controller; 10. Battery device; 11. Box body; 11a. Receiving cavity; 111. First box body section; 112. Second box body section; 20. Battery cell assembly; 21. First battery cell assembly; 22. Second battery cell assembly; 30. Battery cell; 31. Housing; 31a. First surface; 31b. Second surface; 32. Electrode assembly; 321. Electrode body; 322. Tab; 33. Electrode terminal; 40. Structural beam; 40a. Cavity; 41. First part; 411. First plate; 412. First limiting member; 412a. Guide groove; 42. Second part; 421. Second plate; 422. Second limiting member; 43. Third limiting member; 44. Clearance groove; 50. Pressure sensor; 50a. First projection; 60. Connectors; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0044] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc., are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0045] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0047] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "top", "bottom", "inner", "outer", "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, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0048] 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.

[0049] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0050] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. Specifically, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0051] 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.

[0052] 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.

[0053] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. There are no particular limitations in the embodiments of this application.

[0054] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0055] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0056] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0057] In some implementations, the electrode assembly is a stacked structure.

[0058] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0059] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0060] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0061] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0062] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0063] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0064] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0065] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0066] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0067] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

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

[0069] As an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into an independent module. As an example, the battery module can be formed by bundling multiple battery cells together with cable ties.

[0070] In some embodiments, the battery device may include a housing and one or more battery cell assemblies, the battery cell assemblies being housed within the housing.

[0071] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0072] As an example, the battery cell assembly can also be housed in the housing assembly by directly fixing multiple battery cells to the housing.

[0073] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first enclosure may be a top cover or a bottom plate.

[0074] As an example, the enclosure 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 enclosure forms a closed space to accommodate the individual battery cells.

[0075] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, the housing may be at least a portion of the vehicle's floor, or portions of the housing may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0076] In battery devices, during the cyclic charging and discharging process, the electrode assemblies of individual battery cells undergo cyclic expansion and recovery deformation. During this expansion, the electrode assemblies generate expansion forces. Pressure sensors are typically used to measure these expansion forces to assess the battery device's condition, provide early warning of thermal runaway, and predict its lifespan, thereby improving the device's reliability. Existing technologies primarily utilize external sensor methods and dummy battery cell methods to monitor these expansion forces. External sensor methods involve placing sensors between the battery cell assembly and the casing or internal structural components, for example, placing sensors on the outside of the battery cell assembly's end plate. Dummy battery cell methods replace real battery cells with dummy cells equipped with sensors. However, both methods occupy space within the casing, affecting the battery device's energy density. Furthermore, they alter the original arrangement of the battery cell assemblies and other structural components within the device, and they do not perform in-situ detection of the battery cell expansion forces, impacting the sensor's accuracy in detecting these forces.

[0077] In view of this, the battery device provided in this application embodiment includes a housing, at least one battery cell, and at least one pressure sensor. The housing has a receiving cavity and includes at least one structural beam. The battery cell is received within the receiving cavity, and the structural beam is located on the side of the battery cell along a first direction. The interior of the structural beam has a cavity. The pressure sensor is disposed within the cavity and is used to detect the expansion force of the battery cell along the first direction.

[0078] The battery device provided in this application embodiment, by placing at least one pressure sensor inside the cavity of the structural beam, can detect the magnitude of the expansion force of the battery cell along the first direction. This improves the accuracy of the pressure sensor in detecting the expansion force of the battery cell, allowing the battery management system or external control components to more accurately assess the battery device's condition, provide thermal runaway warnings, and predict its lifespan based on the detected expansion force of the battery cell. This improves the reliability of the battery device, reduces the additional space occupied by the pressure sensor within the housing, and increases the energy density of the battery device.

[0079] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices including battery devices.

[0080] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.

[0081] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0082] For ease of explanation, the following embodiments will be described using a vehicle 1 as an example of an electrical device according to an embodiment of this application.

[0083] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1 provided in an embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 10 is installed inside vehicle 1, and 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's electrical system, such as meeting the power requirements for starting, navigation, and operation of vehicle 1.

[0084] The vehicle 1 may also include a controller 1b and a motor 1a. The controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0085] 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, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0086] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in the embodiments of this application. Figure 3This is a schematic diagram of the structure of the battery cell assembly 20 in the battery device 10 provided in an embodiment of this application. The battery device 10 includes a housing 11 and a battery cell 30, with the battery cell 30 housed within the housing 11. The housing 11 provides a receiving cavity 11a for the battery cell 30, and the housing 11 can adopt various structures. In some embodiments, the housing 11 may include a first housing portion 111 and a second housing portion 112, which overlap each other, and together define the receiving cavity 11a for accommodating the battery cell 30. The first housing portion 111 can be a hollow structure with one end open, and the second housing portion 112 can be a plate-like structure. The second housing portion 112 covers the opening side of the second housing portion 112 so that the first housing portion 111 and the second housing portion 112 together define the receiving cavity 11a. Alternatively, the first housing portion 111 and the second housing portion 112 can both be hollow structures with one side open, and the opening side of the first housing portion 111 covers the opening side of the second housing portion 112.

[0087] In the battery device 10, there can be multiple battery cells 30, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 30 are connected in both series and parallel configurations. Multiple battery cells 30 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 30 is housed within the housing 11. Alternatively, the battery device 10 can also consist of multiple battery cells 30 first connected in series, parallel, or in a mixed manner to form a battery cell assembly 20, and then the multiple battery cell assemblies 20 are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 11. The battery device 10 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 30.

[0088] Among them, the battery cell 30 can be a secondary battery or a primary battery; the battery cell 30 can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited to these.

[0089] Please refer to Figure 4 , Figure 4 This is a schematic diagram of the exploded structure of a battery cell 30 provided in an embodiment of this application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32, and electrode terminals 33. The housing 31 includes a casing 311 and an end cap 312. The casing 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0090] Electrode assembly 32 is the component in the battery cell 30 where electrochemical reactions occur. The housing 311 may contain one or more electrode assemblies 32. The electrode assembly 32 is mainly formed by winding or stacking positive and negative electrode plates, and typically a separator is provided between the positive and negative electrode plates to separate them and prevent internal short circuits. The portions of the positive and negative electrode plates containing active material constitute the electrode body 321 of the electrode assembly 32, while the portions of the positive and negative electrode plates without active material each constitute a tab 322. The positive and negative tabs may be located together at one end of the electrode body 321 or separately at both ends of the electrode body 321. During the charging and discharging process of the battery cell 30, the positive and negative active materials react with the electrolyte, and the tabs 322 connect to the electrode terminals 33 to form a current loop.

[0091] Firstly, such as Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, the battery device 10 provided in this embodiment includes a housing 11, at least one battery cell 30, and at least one pressure sensor 50. The housing 11 has a receiving cavity 11a and includes at least one structural beam 40. The battery cell 30 is received within the receiving cavity 11a. The structural beam 40 is located on the side of the battery cell 30 along the first direction X, and the interior of the structural beam 40 has a cavity 40a. The pressure sensor 50 is disposed within the cavity 40a. At least one side of the pressure sensor 50 along the first direction X can contact the battery cell 30, or at least one side of the pressure sensor 50 along the first direction X can contact the structural beam 40. The pressure sensor 50 is used to detect the expansion force of the battery cell 30 along the first direction X.

[0092] The housing 11 may include one, two, or more structural beams 40. A structural beam 40 may be located on any side of the housing 11 along the first direction X, or it may be located in the middle region of the housing 11 along the first direction X. In embodiments where the housing 11 includes multiple structural beams 40, the multiple structural beams 40 may be spaced apart along the first direction X, and a battery cell 30 may be disposed between any two structural beams 40. The structural beams 40 may be fixedly connected to the housing 11, and the connection method may include welding, bonding, or fastener connection.

[0093] The battery device 10 may include one, two, or more battery cells 30. The battery cells 30 may be arranged along a first direction X, or arranged in an array along two intersecting directions. The structural beam 40 may be located on one or both sides of the battery cells 30 arranged along the first direction X, or at least one battery cell 30 may be arranged on both sides of the structural beam 40 along the first direction X.

[0094] Optionally, the battery cell 30 can be directly installed inside the housing 11, or multiple battery cells 30 can be first assembled into a battery cell assembly 20, and then the multiple battery cell assemblies 20 can be installed inside the housing 11.

[0095] The structural beam 40 can be an expansion beam or similar structure. During the cyclic charging and discharging of the battery device 10, the individual battery cells 30 will cyclically expand and contract. When the individual battery cells 30 expand, the structural beam 40 can absorb the expansion force of the individual battery cells 30 along the first direction X, thereby reducing the risk of structural deformation of the battery device 10 and loosening of fasteners caused by the expansion force of the individual battery cells 30. It also reduces the risk of uneven contact pressure between the individual battery cells 30, which could lead to localized overheating or accelerated performance degradation inside the battery device 10. In addition, by limiting the expansion of the individual battery cells 30 along the first direction X by the structural beam 40, the risk of internal short circuits caused by excessive expansion force in the individual battery cells 30 can also be reduced, thereby improving the reliability of the battery device 10.

[0096] The structural beam 40 is disposed on the side of the battery cell 30 along the first direction X, which can be the direction in which the battery cell 30 can undergo expansion deformation. The outer shell 31 of the battery cell 30 can have a first surface 31a perpendicular to the first direction X. The first surface 31a can be a surface with a larger area, or it can be a surface with a smaller area. Along the first direction X, the structural beam 40 can directly abut against the battery cell 30 at the end of the battery cell assembly 20 to sense and measure the expansion force generated by the battery cell assembly 20 in situ and directly, reducing force transmission hysteresis and external interference, and improving detection accuracy.

[0097] The cavity 40a inside the structural beam 40 can be formed by removing part of the internal material during the forming process of the structural beam 40, or the structural beam 40 can include at least two portions spaced apart along the first direction X to form the cavity 40a between the at least two portions. Therefore, the cavity 40a can be a closed cavity, or the cavity 40a can be an open cavity communicating with the receiving cavity 11a outside the structural beam 40.

[0098] The structural beam 40 has a certain structural stiffness to limit the expansion deformation of the battery cell 30. The structural beam 40 can still have the corresponding structural stiffness and external dimensions after the cavity is provided by increasing the wall thickness of the structural beam 40.

[0099] The battery device 10 may include one, two or more pressure sensors 50, which may be strain gauge pressure sensors, piezoelectric pressure sensors or capacitive pressure sensors, etc., and can be selected according to actual needs.

[0100] In embodiments where the battery device 10 includes multiple pressure sensors 50, the multiple pressure sensors 50 can be disposed on the sides of different battery cells 30 to detect the expansion force of different battery cells 30. The different pressure sensors 50 can be spaced apart along a first direction X, or the different pressure sensors 50 can be spaced apart along a direction intersecting the first direction X, or multiple pressure sensors 50 can be arranged in an array along two intersecting directions.

[0101] The pressure sensor 50 is located inside the cavity 40a, which may refer to at least a portion of the pressure sensor being fixedly connected to the inner wall of the structural beam 40. Along the first direction X, the pressure sensor 50 does not extend beyond the structural beam 40.

[0102] The expansion force of the battery cell 30 detected by the pressure sensor 50 can be directly transmitted from the battery cell 30 to the pressure sensor 50, or the expansion force of the battery cell 30 can be first transmitted to the structural beam 40, and then transmitted from the structural beam 40 to the battery cell 30. Therefore, at least one side of the pressure sensor 50 along the first direction X can be in direct contact with the battery cell 30, or can be in direct contact with the structural beam 40.

[0103] The pressure sensor 50 can contact the battery cell 30, but it is not necessary for the pressure sensor 50 to be in constant contact with the battery cell 30. In some cases, such as when the battery cell 30 does not expand, there can be a gap between the pressure sensor 50 and the battery cell 30 along the first direction X. When the battery cell 30 expands, the pressure sensor 50 contacts the battery cell 30 to detect the expansion force of the battery cell 30. Of course, in other embodiments, the pressure sensor 50 can also be configured to always be in contact with the battery cell 30, that is, regardless of whether the battery cell 30 expands, the pressure sensor 50 remains in contact with the battery cell 30.

[0104] Similarly, while the pressure sensor 50 can contact the structural beam 40 on at least one side along the first direction X, it is not always in contact with the structural beam 40. In some cases, such as when the battery cell 30 does not expand, there may be a gap between the pressure sensor 50 and the structural beam 40 along the first direction X. When the battery cell 30 expands, the pressure sensor 50 contacts the structural beam 40 so that the pressure sensor 50 can detect the expansion force of the battery cell 30 through the conduction of the structural beam 40. Of course, in other embodiments, the pressure sensor 50 can also be configured to always be in contact with the structural beam 40, that is, regardless of whether the battery cell 30 expands, the pressure sensor 50 remains in contact with the structural beam 40.

[0105] The pressure sensor 50 can directly detect the magnitude of the expansion force along the first direction X. Alternatively, the pressure sensor 50 can calculate the magnitude of the expansion force on the battery cell 30 based on the detected stress or strain, using corresponding calculation rules from components such as the battery management system. For example, the structural beam 40 may include a first part 41, which can be the beam wall of the structural beam 40. Both ends of the first part 41 along the first direction X can respectively abut against the battery cell 30 and the pressure sensor 50, and the pressure sensor 50 senses the expansion force of the battery cell 30 transmitted to the first part 41. Alternatively, the structural beam 40 may have an opening in the first direction X, through which the pressure sensor 50 protrudes and directly abuts against the battery cell 30, thereby detecting the expansion force. Along the first direction X, the end of the pressure sensor 50 that abuts against the battery cell 30 can be flush with the structural beam 40.

[0106] The pressure sensor 50 can be electrically connected to the battery management system (BMS) to provide power to the pressure sensor 50. The magnitude of the expansion force detected by the pressure sensor 50 can be transmitted to the BMS in the form of an electrical signal. The BMS or an external control unit of the battery device 10 can perform safety warnings, life assessments, and condition calibrations on the battery device 10 based on the magnitude of the expansion force of the individual battery cells 30. If the battery device 10 is used in a vehicle, the vehicle's control unit is electrically connected to the BMS, and the BMS can transmit the magnitude of the expansion force detected by the pressure sensor 50 to the vehicle's control unit.

[0107] For example, if the control unit outside the battery management system or the battery device 10 determines that the expansion force detected by the pressure sensor 50 exceeds a preset safety threshold, it can send a signal to an alarm device inside or outside the battery device 10 and control the battery device 10 to stop charging or limit the charging current of the battery device 10.

[0108] Additionally, the battery management system or the control unit outside the battery device 10 establishes a relationship model between the expansion force and the health status of the battery device 10 based on the long-term growth trend of the expansion force of the battery cells 30, in order to assess the remaining lifespan of the battery device 10, etc.

[0109] Furthermore, the battery management system or the control unit outside the battery device 10 can accurately determine the state of charge of the battery device 10 and other internal states of the battery device 10 by combining the expansion force of the battery cell 30 with relevant parameters such as voltage and temperature of the battery device 10.

[0110] Since the structural beam 40 is located on the side of the battery cell 30, it can more directly sense the expansion force of the battery cell 30 along the first direction X. Since the pressure sensor 50 is located in the cavity 40a of the structural beam 40, the expansion force borne by the structural beam 40 can be directly transmitted to the pressure sensor 50, reducing the transmission path of the expansion force. This allows the pressure sensor 50 to more accurately detect the magnitude of the expansion force of the battery cell 30, thereby improving the accuracy of the magnitude of the expansion force detected by the pressure sensor 50.

[0111] Since the pressure sensor 50 is located in the cavity 40a of the structural beam 40, the pressure sensor 50 does not need to occupy additional space inside the housing 11, and the related wiring connected to the pressure sensor 50 can be arranged inside the structural beam 40. This helps to reduce the additional space occupied by the pressure sensor 50 and related wiring inside the housing 11, thereby increasing the energy density of the battery device 10.

[0112] The battery device 10 provided in this application embodiment, by setting at least one pressure sensor 50 in the cavity 40a inside the structural beam 40, can detect the magnitude of the expansion force of the battery cell 30 along the first direction X through the pressure sensor 50. This is beneficial to improving the accuracy of the pressure sensor 50 in detecting the expansion force of the battery cell 30. It is also beneficial to enable the battery management system or external control components of the battery device 10 to more accurately perform state assessment, thermal runaway early warning, and life prediction of the battery device 10 based on the magnitude of the expansion force of the battery cell 30 detected by the battery device 10. This is beneficial to improving the reliability of the battery device 10, reducing the extra space occupied by the pressure sensor 50 in the housing 11, and increasing the energy density of the battery device 10.

[0113] In some embodiments, such as Figure 4 and Figure 5 As shown, the battery cell 30 includes a housing 31 and an electrode assembly 32. The electrode assembly 32 is housed within the housing 31. The housing 31 includes two first surfaces 31a opposite each other along a first direction X and two second surfaces 31b opposite each other along a second direction Y. The first surfaces 31a connect the two second surfaces 31b. The electrode assembly 32 includes an electrode body 321 and tabs 322. The tabs 322 extend from the end of the electrode body 321 along a third direction Z. The first direction X, the second direction Y, and the third direction Z intersect each other but are not coplanar. The projected area of ​​the electrode body 321 along the first direction X on the first surface 31a is larger than the projected area of ​​the electrode body 321 along the second direction Y on the second surface 31b.

[0114] The outer casing 31 of the battery cell 30 can be rectangular. The battery cell 30 can include one, two or more battery cell assemblies 20. The multiple battery cell assemblies 20 can be stacked along the first direction X.

[0115] The electrode assembly 32 includes electrode sheets, which can be wound or stacked together along the first direction X. Since the projected area of ​​the electrode body 321 along the first direction X on the first surface 31a is larger than the projected area of ​​the electrode body 321 along the second direction Y on the second surface 31b, during the cyclic operation of the battery cell 30, for the stacked electrode assembly 32 or the wound electrode assembly 32, the expansion direction is mainly along the normal of the first surface 31a. That is, the battery cell 30 mainly expands and deforms along the first direction X, and generates a large expansion force along the first direction X.

[0116] Thus, both the structural beam 40 and the pressure sensor 50 are located on the side of the battery cell 30 along the first direction X. The pressure sensor 50 can detect the magnitude of the expansion force in the direction where the battery cell 30 produces a large expansion deformation, which helps to improve the accuracy of the expansion force measurement. It also makes it easier for the battery management system or external control components of the battery device 10 to more accurately perform state assessment, thermal runaway early warning, and life prediction of the battery device 10 based on the magnitude of the expansion force.

[0117] In some embodiments, the battery device 10 includes a battery cell assembly 20, which includes a plurality of battery cells 30 arranged along a first direction X, and at least one structural beam 40 is disposed on at least one side of the battery cell assembly 20 along the first direction X.

[0118] Multiple battery cells 30 of the battery cell assembly 20 are arranged along the first direction X. Optionally, a structural beam 40 can be set on either side of the battery cell assembly 20 along the first direction X to detect the expansion force of the battery cells 30 on either side of the battery cell assembly 20 along the first direction X; or, two structural beams 40 can be set on both sides of the battery cell assembly 20 along the first direction X to detect the expansion force on both sides of the battery cell assembly 20.

[0119] The structural beam 40 can be part of the wall of the housing 11, or the structural beam 40 can be connected to the side of the wall of the housing 11 facing the receiving cavity 11a. In this way, the structural beam 40 located on at least one side of the battery cell assembly 20 along the first direction X can not only limit the expansion deformation of the battery cell 30, but also provide a certain structural strength to the housing 11, thereby improving the overall load-bearing capacity of the housing 11. Furthermore, during the assembly process, the structural beam 40 can be installed using part of the space in the wall of the housing 11, which helps to reduce the space occupied by the structural beam 40 inside the battery device 10, thereby improving the energy density of the battery device 10.

[0120] In some embodiments, such as Figure 5As shown, at least one structural beam 40 is provided with a first battery cell assembly 21 and a second battery cell assembly 22 on both sides along the first direction X. The first battery cell assembly 21 and the second battery cell assembly 22 respectively include a plurality of battery cells 30 arranged along the first direction X.

[0121] The battery device 10 may have only one structural beam 40, which is located between the first battery cell assembly 21 and the second battery cell assembly 22; or, the battery device 10 may include multiple structural beams 40, one of which is located between the first battery cell assembly 21 and the second battery cell assembly 22, while at least another may be located on the side of the first battery cell assembly 21 away from the second battery cell assembly 22, and / or, at least one more structural beam 40 is located on the side of the second battery cell assembly 22 away from the first battery cell assembly 21 along the first direction X.

[0122] Both the first battery cell assembly 21 and the second battery cell assembly 22 include at least two battery cells 30 arranged along the first direction X. The number of battery cells 30 arranged along the first direction X in the first battery cell assembly 21 and the second battery cell assembly 22 may be the same or different. In other words, the number of battery cells 30 arranged along the first direction X on both sides of the structural beam 40 may be the same or different, and can be set according to actual needs.

[0123] It is understandable that during the operation of the battery device 10, the heat dissipation efficiency of the battery cells 30 in different areas is different, and the resulting expansion deformation is also different. Compared with the battery cells 30 near the edge of the housing 11 along the first direction X, the battery cells 30 located in the non-edge area of ​​the battery cell assembly 20 along the first direction X have lower heat dissipation efficiency and greater expansion deformation.

[0124] In this way, the structural beam 40 can limit the expansion and deformation of the battery cells 30 on both sides along the first direction X, thereby improving the limiting effect of the expansion and deformation of the two pairs of battery cells 30 and improving the reliability of the battery device 10. Furthermore, the pressure sensor 50 can detect the expansion force of the battery cells 30 with larger expansion forces. These battery cells 30 with larger expansion and deformation have a more significant impact on the operating state, lifespan, and occurrence of thermal runaway of the battery device 10, thus enabling more accurate condition assessment, thermal runaway early warning, and lifespan prediction of the battery device 10.

[0125] In some embodiments, the absolute value of the difference between the number of battery cells 30 in the first battery cell assembly 21 and the second battery cell assembly 22 is less than or equal to 20.

[0126] The difference in the number of battery cells 30 in the first battery cell assembly 21 and the second battery cell assembly 22 is the difference in the number of battery cells 30 arranged along the first direction X on both sides of the structural beam 40.

[0127] Optionally, the absolute value of the difference between the number of battery cells 30 in the first battery cell assembly 21 and the second battery cell assembly 22 can be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20, etc.

[0128] Understandably, during the cyclic operation of the battery device 10, multiple battery cells 30 are arranged along the first direction X. Along the first direction X, the closer to the center, the worse the heat dissipation effect of the corresponding battery cell 30, and the greater the expansion deformation and expansion force it generates.

[0129] By setting the absolute value of the difference between the number of battery cells 30 in the first battery cell assembly 21 and the second battery cell assembly 22 to be less than or equal to 20, that is, by setting at least one structural beam 40 to be arranged as close as possible to the middle area of ​​the multiple battery cells 30 arranged along the first direction X, the structural beam 40 can provide a better effect of limiting the expansion of the multiple battery cells 30 on both sides of the first direction X. The pressure sensor 50 can detect the expansion force of the battery cells 30 with greater expansion and deformation in the battery device 10. These battery cells 30 with greater expansion and deformation have a more important impact on the working state, lifespan and thermal runaway of the battery device 10, so as to more accurately assess the state of the battery device 10, provide early warning of thermal runaway and predict the lifespan.

[0130] In some embodiments, such as Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 10 , Figure 11 and Figure 12 As shown, the structural beam 40 includes a first part 41 and a second part 42. At least a portion of the first part 41 and the second part 42 are spaced apart along a first direction X and form a cavity 40a. A pressure sensor 50 is sandwiched between the first part 41 and the second part 42 along the first direction X.

[0131] The first part 41 and the second part 42 may be plate-shaped, block-shaped or other irregular shapes, respectively. At least a portion of the first part 41 and the second part 42 are located on both sides of the pressure sensor 50 along the first direction X, so as to form a cavity 40a between at least a portion of the first part 41 and the second part 42. The pressure sensor 50 is disposed in the cavity 40a and sandwiched between the first part 41 and the second part 42. The first part 41 and the second part 42 can more directly apply the expansion deformation or expansion force to the pressure sensor 50, so that the pressure sensor 50 can more accurately detect the magnitude of the expansion force.

[0132] At least a portion of the first part 41 and the second part 42 are spaced apart along the first direction X. Optionally, the first part 41 and the second part 42 may be entirely spaced apart along the first direction X. Alternatively, a portion of the first part 41 and the second part 42 may be spaced apart along the first direction X, while the other portion may be connected to or abut against each other along the first direction X. The pressure sensor 50 may be sandwiched between the portions of the first part 41 and the second part 42 spaced apart along the first direction X.

[0133] During the assembly of the battery device 10, the first part 41 and the second part 42 can be arranged to move relative to each other along the first direction X by the pressure sensor 50 until the pressure sensor 50 is sandwiched between the first part 41 and the second part 42. This helps to reduce the assembly process of the pressure sensor 50 and the structural beam 40. By setting at least a portion of the first part 41 and the second part 42 to be spaced apart along the first direction X, the micro-deformation that the first part 41 and the second part 42 can produce under the action of the expansion force of the battery cell 30 is more sensitive. This allows for more sensitive transmission of the expansion deformation or expansion force of the battery cell 30 to the pressure sensor 50, which helps to improve the accuracy of the pressure sensor 50 in detecting the expansion force of the battery cell 30.

[0134] In some embodiments, such as Figure 7 , Figure 8 and Figure 10 As shown, the first part 41 includes a first plate 411 and a first limiting member 412. The first limiting member 412 is connected to at least one end of the first plate 411 along a third direction Z, which intersects with the first direction X. The second part 42 includes a second plate 421 and a second limiting member 422. The second limiting member 422 is connected to at least one end of the second plate 421 along a third direction Z. The pressure sensor 50 is sandwiched between the first plate 411 and the second plate 421. At least a portion of the first limiting member 412 and at least a portion of the second limiting member 422 are located on the side of the pressure sensor 50 along the third direction Z.

[0135] The first plate 411 and the first limiting member 412 can be integrally formed, or the first plate 411 and the second limiting member 422 can be separately formed and then connected together by welding or fasteners. Similarly, the second plate 421 and the second limiting member 422 can be integrally formed, or the second plate 421 and the second limiting member 422 can be separately formed and then connected together.

[0136] Optionally, the first part 41 and the second part 42 each include a first limiting member 412 and a second limiting member 422. The first limiting member 412 is connected to one end of the first plate 411 along the third direction Z, and the second limiting member 422 is connected to one end of the second plate 421 along the third direction Z. At least portions of the second limiting member 422 and the first limiting member 412 are respectively on the same side of the pressure sensor 50 along the third direction Z, or at least portions of the second limiting member 422 and the first limiting member 412 are respectively located on opposite sides of the pressure sensor 50 along the third direction Z. Alternatively, the first part 41 and the second part 42 may each include two first limiting members 412 and two second limiting members 422. The two first limiting members 412 are connected to both ends of the first plate 411 along the third direction Z, and the two second limiting members 422 are connected to both ends of the second plate 421 along the third direction Z.

[0137] In an embodiment where the first limiting member 412 and the second limiting member 422 are respectively located on the same side of the pressure sensor 50 along the third direction Z, the first limiting member 412 and the second limiting member 422 can be spaced apart from each other along the first direction X, or the first limiting member 412 and the second limiting member 422 can be engaged with each other, or the first limiting member 412 and the second limiting member 422 can be connected to the wall of the housing 11 along the third direction Z side by fasteners.

[0138] The pressure sensor 50 is clamped between the first plate 411 and the second plate 421. This facilitates the installation of the pressure sensor 50 and the structural beam 40 during the assembly of the battery device 10. Furthermore, when the battery cell 30 expands, the first plate 411 and the second plate 421 are more sensitive to expansion deformation or expansion force, allowing for more accurate transmission of the expansion deformation or expansion force to the pressure sensor 50. This improves the accuracy of the pressure sensor 50 in detecting the expansion force of the battery cell 30. The first limiting member 412 and the second limiting member 422 provide some protection for the pressure sensor 50 along the third direction Z, reducing the risk that the pressure sensor 50 may be affected by external forces along the third direction Z, thus improving the accuracy of expansion force detection.

[0139] In some embodiments, such as Figure 6 , Figure 8 , Figure 9 and Figure 12As shown, at least one first limiting member 412 and at least one second limiting member 422 are located on the same side of the pressure sensor 50 along the third direction Z. The first limiting member 412 has a guide groove 412a on the side facing the second limiting member 422 along the first direction X. A portion of the second limiting member 422 along the first direction X is disposed in the guide groove 412a and spaced apart from the bottom wall of the guide groove 412a.

[0140] The opening of the guide groove 412a of the first limiting member 412 is disposed facing the second limiting member 422, and the bottom wall of the guide groove 412a is located at the bottom of the guide groove 412a opposite to the opening along the first direction X.

[0141] Optionally, the first limiting member 412 may have one, two, or more guide grooves 412a. A portion of the second limiting member 422 along the first direction X is located within the guide groove 412a, while the other portion of the second limiting member 422 along the first direction X is not located within the guide groove 412a. Thus, the second limiting member 422 and the guide groove 412a are slidably engaged, allowing them to move relative to each other or away from each other along the first direction X. The first limiting member 412 and the second limiting member 422 can slidably engage with the wall of the housing 11, allowing the first portion 41 and the second portion 42 to slide relative to the wall of the housing 11 along the first direction X.

[0142] In this way, under the expansion force of the battery cell 30, the first limiting member 412 and the second limiting member 422 can generate relative movement along the first direction X under the guidance of the guide groove 412a, so that the second limiting member 422 can extend further into the limiting groove without generating relative movement in other directions intersecting the first direction X. This makes it easier for the first part 41 and the second part 42 to transmit the expansion deformation or expansion force of the battery cell 30 along the first direction X more accurately to the pressure sensor 50, reducing the risk that the relative movement of the first part 41 or the second part 42 along the first direction X may affect the accuracy of the expansion force or expansion deformation transmitted to the pressure sensor 50.

[0143] In some embodiments, such as Figure 10 As shown, the battery device 10 also includes a connector 60. The first limiting member 412 and the second limiting member 422 are located on the same side of the pressure sensor 50 along the third direction Z. The connector 60 connects the first limiting member 412, the second limiting member 422 and the wall of the housing 11.

[0144] Optionally, the connector 60 can be a bolt, nut, pin, rivet, or screw. The first limiting member 412 and the second limiting member 422 are connected to the wall of the housing 11 by the connector 60, which helps to improve the overall rigidity of the structural beam 40, thereby improving the limiting effect of the structural beam 40 on the expansion deformation of the battery cell 30, and further improving the reliability of the battery device 10.

[0145] In some embodiments, such as Figure 11 and Figure 12 As shown, one of the first plate 411 and the second plate 421 has a third limiting member 43, and the other has a limiting recess. The third limiting member 43 extends along the first direction X and is inserted into the limiting recess.

[0146] Optionally, one of the first plate 411 and the second plate 421 has one, two or more third limiting members 43, and the other has a corresponding number of limiting recesses.

[0147] The third limiting member 43 can be cylindrical, prismatic, or other regular or irregular shapes, and the corresponding limiting recess can have a shape that is compatible with the third limiting member 43.

[0148] During the assembly of the battery device 10, the cooperation between the third limiting member 43 and the limiting recess can provide a certain positioning and guiding effect for the relative position of the first plate 411 and the second plate 421, so as to facilitate the assembly and coordination of the first part 41 and the second part 42.

[0149] After the battery device 10 is assembled, the cooperation between the third limiting member 43 and the limiting recess can provide a certain limiting effect on the first plate 411 and the second plate 421 intersecting the first direction X, so that the first plate 411 and the second plate 421 can only generate relative displacement along the first direction X, so that the expansion deformation or expansion force generated by the battery cell 30 can be more accurately transmitted to the pressure sensor 50 through the first plate 411 and the second plate 421, further improving the accuracy of the expansion force of the battery cell 30 detected by the pressure sensor 50.

[0150] In some embodiments, such as Figure 7 , Figure 11 and Figure 12 As shown, at least one of the first part 41 and the second part 42 has a clearance groove 44, and at least a portion of the pressure sensor 50 is disposed in the clearance groove 44.

[0151] Optionally, one of the first part 41 and the second part 42 may be provided with a clearance groove 44, while the other part may not be provided with a clearance groove 44, or the first part 41 and the second part 42 may be provided with clearance grooves 44 respectively.

[0152] During the assembly of the battery device 10, the pressure sensor 50 can be placed in the clearance groove 44 of the first part 41 or the second part 42 to position the pressure sensor 50, thereby improving the convenience of assembling the pressure sensor 50, the first part 41 and the second part 42.

[0153] After the battery device 10 is assembled, the clearance groove 44 of the first part 41 and / or the second part 42 can provide a certain limiting effect on the pressure sensor 50, reducing the risk that the pressure sensor 50 will produce displacement in other directions intersecting the first direction X, which would affect the accuracy of the expansion force detected by the pressure sensor 50.

[0154] In some embodiments, such as Figure 5 , Figure 6 , Figure 11 and Figure 12 As shown, the battery device 10 includes at least two battery cell assemblies 20 arranged along a second direction Y, and each battery cell assembly 20 includes a plurality of battery cells 30 arranged along a first direction X. The battery device 10 includes at least two pressure sensors 50, and each pressure sensor 50 is configured to correspond one-to-one with a battery cell assembly 20 arranged along the second direction Y.

[0155] Multiple battery cells 30 in the battery device 10 can be arranged in an array along a first direction X and a second direction Y. The first direction X and the second direction Y can intersect at a right angle, an acute angle or an obtuse angle, etc. For example, the first direction X and the second direction Y are perpendicular to each other, which is beneficial to improving the energy density of the battery device 10.

[0156] The number of pressure sensors 50 is equal to the number of battery cell assemblies 20, and one pressure sensor 50 corresponds to one battery cell assembly 20. The expansion force of different battery cell assemblies 20 arranged along the second direction Y is detected by different pressure sensors 50.

[0157] In this way, by using multiple pressure sensors 50, the expansion force of the battery cells 30 in the battery cell assembly 20 along the second direction Y inside the battery device 10 can be obtained. By using the expansion force information of multiple battery cells 30 arranged along the second direction Y, the battery device 10 can be more accurately assessed. The pressure sensors 50 can detect the expansion force of battery cells 30 with larger expansion forces. These battery cells 30 with larger expansion and deformation have a more significant impact on the operating state, lifespan, and occurrence of thermal runaway of the battery device 10, so as to more accurately assess the state of the battery device 10, provide early warning of thermal runaway, and predict the lifespan.

[0158] In some embodiments, such as Figure 13 , Figure 14 and Figure 15As shown, the outer casing 31 of the battery cell 30 has a first surface 31a on one side along the first direction X, and at least one pressure sensor 50 has a first projection 50a on the first surface 31a along the first direction X. The minimum distances between the first projection 50a and the first surface 31a along the second direction Y are d1 and d2, respectively, where |d1-d2|≤3mm; and / or, the minimum distances between the first projection 50a and the first surface 31a along the third direction Z are h1 and h2, respectively, where |h1-h2|≤3mm. The first direction X, the second direction Y, and the third direction Z intersect each other but are not coplanar.

[0159] The first direction X, the second direction Y, and the third direction Z can intersect each other at acute, right, or obtuse angles. For example, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0160] During the cyclic operation of the battery cell 30, the region in the electrode assembly 32 that experiences expansion deformation along the first direction X and has a large expansion force is mainly located in the central region of the electrode assembly 32, that is, in the central region of the electrode body 321 perpendicular to the first direction X. Therefore, the closer the region of the electrode body 321 is to the center along the first direction X, the greater the expansion deformation and expansion force.

[0161] In the battery cell 30, the center of the electrode body 321 is relatively close to the center of the first surface 31a. The center of the first surface 31a can roughly reflect the center of the electrode body 321. In other words, the closer the first projection 50a is to the center of the first surface 31a, the closer the center of the first projection 50a is to the center of the electrode body 321.

[0162] The minimum distance between the first projection 50a and the first surface 31a along the second direction Y can be the distance between the edges of the first projection 50a along the second direction Y and the edges of the first surface 31a along the second direction Y. The smaller |d1-d2| is, the closer the geometric center of the first projection 50a is to the center of the first surface 31a along the second direction Y, and thus the closer it is to the center of the electrode body 321 along the second direction Y.

[0163] Similarly, the minimum distance between the first projection 50a and the two sides of the first surface 31a along the third direction Z can be the minimum distance between the edges of the first projection 50a along the third direction Z and the edges of the first surface 31a along the third direction Z. The smaller the value of |h1-h2|, the closer the geometric center of the first projection 50a is to the center of the first surface 31a along the third direction Z, and also the closer it is to the center of the electrode body 321 along the third direction Z.

[0164] It is understandable that the pressure sensor 50 can be prismatic or cylindrical, and the corresponding first projection 50a can be square or circular or similar shapes.

[0165] Optionally, |d1-d2| can be 0, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, or 3mm, etc. |h1-h2| can be 0, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, or 3mm, etc.

[0166] It is understandable that the central region for detecting the expansion force of the pressure sensor 50 can be located at the geometric center of the pressure sensor 50, with |d1-d2|≤3mm and / or |h1-h2|≤3mm. That is, the geometric center of the pressure sensor 50 is set to be as close as possible to the geometric center of the electrode body 321, so that the expansion force detected by the pressure sensor 50 is close to the expansion force or expansion deformation generated in the central region of the electrode body 321 perpendicular to the first direction X. In other words, the pressure sensor 50 detects the expansion force generated by the electrode assembly 32 or the expansion force in the region with large expansion deformation. This is beneficial to improving the accuracy of the expansion force detected by the pressure sensor 50, so as to more accurately assess the state of the battery device 10, provide thermal runaway early warning, and predict its lifespan through the expansion force of the battery cell 30.

[0167] In some embodiments, the battery device 10 further includes a battery management system and a conductive wire electrically connecting the battery management system to the pressure sensor 50. At least a portion of the conductive wire is located inside the structural beam 40, or on the side of the structural beam 40 along a third direction Z, which intersects with the first direction X.

[0168] Conductive wires can include insulating components and conductive components such as conductive copper wires. Conductive components can be wire harnesses or FPCs (Flexible Printed Circuits).

[0169] The pressure sensor 50 is electrically connected to the battery management system via a conductive wire to transmit electrical energy and / or electrical signals. In the embodiment where electrical energy is transmitted via the conductive wire, the battery management system supplies power to the pressure sensor 50 through the conductive wire to ensure its normal operation. In the embodiment where electrical signals are transmitted via the conductive wire, the pressure sensor 50 can transmit information such as the detected expansion deformation or expansion force of the battery cell 30 to the battery management system as an electrical signal via the conductive wire.

[0170] If at least a portion of the conductive wire is located within the structural beam 40, the conductive wire can be routed within the cavity 40a. Similarly, if at least a portion of the conductive wire is located on the side wall of the structural beam 40 along the third direction Z, the conductive wire can be routed from the side of the structural beam 40 along the third direction Z.

[0171] The battery device 10 may include multiple conductive wires. The conductive wires may be arranged to run entirely from the interior of the structural beam 40, or they may be arranged to run entirely from the side of the structural beam 40 along the third direction Z. Alternatively, some conductive wires may run entirely from the interior of the structural beam 40, while others may run entirely from the side of the structural beam 40 along the third direction Z. The arrangement can be made according to actual needs.

[0172] By setting at least a portion of the conductive wire inside the structural beam 40, or on the side of the structural beam 40 along the third direction Z, it is beneficial to reduce the additional space occupied by the conductive wire inside the battery device 10 along the first direction X, and further beneficial to improve the energy density of the battery device 10.

[0173] In some embodiments, the battery device 10 further includes a signal processing module and a battery management system. The signal processing module is located on the structural beam 40 and is electrically connected to the pressure sensor 50 and the battery management system.

[0174] Optionally, the signal processing module can be located inside the cavity 40a or on the outer surface of the structural beam 40. The signal processing module can be used to amplify, filter, and perform analog-to-digital conversion on the raw signal collected by the pressure sensor 50, and transmit it to the battery management system. This facilitates signal transmission and enables the battery management system or the control unit outside the battery device 10 to more accurately perform state assessment, thermal runaway early warning, and life prediction of the battery device 10.

[0175] In some embodiments, such as Figure 7 As shown, along the first direction X, the thicknesses e1 and e2 of the portion of the structural beam 40 located on both sides of the pressure sensor 50 satisfy: 5mm≤e1≤10mm, 5mm≤e2≤10mm respectively.

[0176] Optionally, e1 can be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm or 10mm, etc.

[0177] Similarly, e2 can be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm or 10mm, etc.

[0178] The thicknesses e1 and e2 of the structural beam 40 along the first direction X can be the same or different. It is understood that a larger thickness e1 and e2 along the first direction X of the structural beam 40 is more conducive to improving the structural stiffness of the structural beam 40, thereby enhancing its ability to limit the expansion and deformation of the battery cell 30 and improving the reliability of the battery device 10. Conversely, a smaller thickness e1 and e2 along the first direction X of the structural beam 40 is, to some extent, more conducive to maximizing the space occupied by the structural beam 40 within the battery device 10, thereby increasing the energy density of the battery device 10.

[0179] By setting the thicknesses e1 and e2 of the portions of the structural beam 40 located on both sides of the pressure sensor 50 to satisfy 5mm≤e1≤10mm and 5mm≤e2≤10mm respectively, it is beneficial to improve the stiffness of the structural beam 40, thereby enhancing the limiting effect of the structural beam 40 on the expansion deformation of the battery cell 30, thus increasing the energy density of the battery device 10, and reducing the space occupied by the structural beam 40 within the accommodating cavity 11a, which is also beneficial to improving the energy density of the battery device 10.

[0180] Secondly, the electrical device provided in the embodiments of this application includes the battery device 10 provided in any of the above embodiments, and the battery device 10 is used to provide electrical energy.

[0181] The electrical device provided in this application has the same technical effect as the battery device 10 provided in any embodiment of this application, and will not be described again here.

[0182] The following description, in conjunction with the accompanying drawings, illustrates a specific embodiment of this application.

[0183] In some embodiments, such as Figures 4 to 15As shown, the battery device 10 includes a housing 11, a battery cell assembly 20, a pressure sensor 50, a battery management system, conductive wires, and a signal processing module. The housing 11 has a receiving function and includes at least one structural beam 40. The battery cell assembly 20 includes a plurality of battery cells 30 arranged along a first direction X. The battery cells 30 are received within a receiving cavity 11a. The structural beam 40 is located on the side of the battery cells 30 along the first direction X, and the interior of the structural beam 40 has a cavity 40a. The pressure sensor 50 is disposed within the cavity 40a and is used to detect the expansion force of the battery cells 30 along the first direction X. The battery cell 30 includes a housing 31 and an electrode assembly 32. The electrode assembly 32 is housed within the housing 31. The housing 31 includes two first surfaces 31a opposite each other along a first direction X and two second surfaces 31b opposite each other along a second direction Y. The first surfaces 31a connect the two second surfaces 31b. The electrode assembly 32 includes an electrode body 321 and tabs 322. The tabs 322 extend from the end of the electrode body 321 along a third direction Z. The first direction X, the second direction Y, and the third direction Z intersect each other but are not coplanar. The projected area of ​​the electrode body 321 along the first direction X on the first surface 31a is larger than the projected area of ​​the electrode body 321 along the second direction Y on the second surface 31b.

[0184] At least one structural beam 40 is provided on at least one side of the battery cell assembly 20 facing the wall of the housing 11 along the first direction X. At least another structural beam 40 is provided with a first battery cell assembly 21 and a second battery cell assembly 22 on both sides along the first direction X. The first battery cell assembly 21 and the second battery cell assembly 22 each include a plurality of battery cells 30 arranged along the first direction X. The absolute value of the difference between the number of battery cells 30 in the first battery cell assembly 21 and the second battery cell assembly 22 is less than or equal to 20.

[0185] The structural beam 40 includes a first part 41 and a second part 42. The first part 41 includes a first plate 411 and a first limiting member 412. The first limiting member 412 is connected to at least one end of the first plate 411 along a third direction Z, which intersects with a first direction X. The second part 42 includes a second plate 421 and a second limiting member 422. The second limiting member 422 is connected to at least one end of the second plate 421 along a third direction Z. The first plate 411 and the second plate 421 are spaced apart and form a cavity 40a. A pressure sensor 50 is sandwiched between the first plate 411 and the second plate 421. At least a portion of the first limiting member 412 and at least a portion of the second limiting member 422 are located on the side of the pressure sensor 50 along the third direction Z. One of the first plate 411 and the second plate 421 has a third limiting member 43, and the other has a limiting recess. The third limiting member 43 extends along the first direction X and is inserted into the limiting recess. At least one of the first part 41 and the second part 42 has a clearance groove 44, and at least a portion of the pressure sensor 50 is disposed within the clearance groove 44.

[0186] The battery device 10 includes at least two battery cell assemblies 20 arranged along a second direction Y. Each battery cell assembly 20 includes a plurality of battery cells 30 arranged along a first direction X. The battery device 10 includes at least two pressure sensors 50, each pressure sensor 50 corresponding to a battery cell assembly 20 arranged along the second direction Y. The housing 31 of each battery cell 30 has a first surface 31a on one side along the first direction X. At least one pressure sensor 50 has a first projection 50a on the first surface 31a along the first direction X. The minimum distances between the first projection 50a and the first surface 31a along the second direction Y are d1 and d2, respectively, where |d1-d2|≤3mm. The minimum distances between the first projection 50a and the first surface 31a along the third direction Z are h1 and h2, respectively, where |h1-h2|≤3mm. The first direction X, the second direction Y, and the third direction Z intersect each other but are not coplanar.

[0187] A conductive wire electrically connects the battery management system and the pressure sensor 50. At least a portion of the conductive wire is located inside the structural beam 40, or on the side of the structural beam 40 along a third direction Z, which intersects with the first direction X. A signal processing module is located on the structural beam 40 and electrically connected to the pressure sensor 50 and the battery management system. Along the first direction X, the thicknesses e1 and e2 of the portions of the structural beam 40 located on both sides of the pressure sensor 50 satisfy: 5mm ≤ e1 ≤ 10mm, 5mm ≤ e2 ≤ 10mm, respectively.

[0188] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A housing having a receiving cavity, the housing including at least one structural beam; At least one battery cell is housed within the receiving cavity, and the structural beam is located on the side of the battery cell along a first direction, the structural beam having an internal cavity; At least one pressure sensor is disposed within the cavity, wherein at least one side of the pressure sensor along the first direction is capable of contacting the battery cell, or wherein at least one side of the pressure sensor along the first direction is capable of contacting the structural beam, and the pressure sensor is used to detect the expansion force of the battery cell along the first direction.

2. The battery device according to claim 1, characterized in that, The battery device includes a battery cell assembly, the battery cell assembly including a plurality of battery cells arranged along the first direction, and at least one of the structural beams is disposed on at least one side of the battery cell assembly along the first direction.

3. The battery device according to claim 1, characterized in that, At least one of the structural beams is provided with a first battery cell assembly and a second battery cell assembly on both sides along the first direction, and the first battery cell assembly and the second battery cell assembly each include a plurality of battery cells arranged along the first direction.

4. The battery device according to claim 3, characterized in that, The absolute value of the difference in the number of battery cells between the first battery cell assembly and the second battery cell assembly is less than or equal to 20.

5. The battery device according to any one of claims 1 to 4, characterized in that, The battery cell includes a housing and an electrode assembly. The electrode assembly is housed within the housing. The housing includes two first surfaces opposite each other along a first direction and two second surfaces opposite each other along a second direction. The first surfaces connect to the two second surfaces. The electrode assembly includes an electrode body and a tab. The tab extends from the end of the electrode body along a third direction. The first direction, the second direction, and the third direction intersect each other but are not coplanar. The area of ​​the electrode body projected onto the first surface along the first direction is greater than the area of ​​the electrode body projected onto the second surface along the second direction.

6. The battery device according to any one of claims 1 to 4, characterized in that, The structural beam includes a first part and a second part, at least a portion of the first part and the second part are spaced apart along the first direction and form the cavity, and the pressure sensor is sandwiched between the first part and the second part along the first direction.

7. The battery device according to claim 6, characterized in that, The first part includes a first plate and a first limiting member, the first limiting member being connected to at least one end of the first plate along a third direction, the third direction intersecting with the first direction; The second part includes a second plate and a second limiting member, the second limiting member being connected to at least one end of the second plate along the third direction; The pressure sensor is sandwiched between the first plate and the second plate, and at least a portion of the first limiting member and at least a portion of the second limiting member are located on the side of the pressure sensor along the third direction.

8. The battery device according to claim 7, characterized in that, At least one first limiting member and at least one second limiting member are located on the same side of the pressure sensor along the third direction. The first limiting member has a guide groove on the side of the first limiting member facing the second limiting member along the first direction. A portion of the second limiting member along the first direction is disposed in the guide groove and is spaced apart from the bottom wall of the guide groove.

9. The battery device according to claim 7, characterized in that, The battery device further includes a connector, wherein the first limiting member and the second limiting member are located on the same side of the pressure sensor along the third direction, and the connector connects the first limiting member, the second limiting member, and the wall of the housing.

10. The battery device according to claim 7, characterized in that, One of the first plate and the second plate has a third limiting member, and the other has a limiting recess. The third limiting member extends along the first direction and is inserted into the limiting recess.

11. The battery device according to claim 6, characterized in that, At least one of the first part and the second part has a clearance groove, and at least a portion of the pressure sensor is disposed within the clearance groove.

12. The battery device according to any one of claims 1 to 4, characterized in that, The battery device includes at least two battery cell assemblies arranged along a second direction, and the battery cell assembly includes a plurality of battery cells arranged along a first direction, the first direction intersecting the second direction; The battery device includes at least two pressure sensors, each pressure sensor corresponding to one of the battery cell assemblies arranged along the second direction.

13. The battery device according to claim 12, characterized in that, The casing of the battery cell has a first surface on one side along the first direction, and at least one pressure sensor has a first projection on the first surface along the first direction. The minimum distances between the first projection and the first surface on both sides along the second direction are d1 and d2, respectively, where |d1-d2|≤3mm; and / or, The minimum distances between the first projection and the first surface along the third direction are h1 and h2, respectively, where |h1-h2|≤3mm. The first direction, the second direction, and the third direction intersect each other but are not coplanar.

14. The battery device according to any one of claims 1 to 4, characterized in that, The battery device further includes a battery management system and conductive wires, the conductive wires electrically connecting the battery management system and the pressure sensor, at least a portion of the conductive wires being located inside the structural beam, or on the side of the structural beam along a third direction, the third direction intersecting the first direction.

15. The battery device according to any one of claims 1 to 4, characterized in that, The battery device also includes a signal processing module and a battery management system. The signal processing module is located on the structural beam and is electrically connected to the pressure sensor and the battery management system.

16. The battery device according to any one of claims 1 to 4, characterized in that, Along the first direction, the thicknesses e1 and e2 of the portions of the structural beam located on both sides of the pressure sensor satisfy: 5mm≤e1≤10mm, 5mm≤e2≤10mm respectively.

17. An electrical device, characterized in that, Includes the battery device as described in any one of claims 1 to 16, the battery device being used to provide electrical energy.

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