Battery device and electric equipment

Abstract

The utility model relates to a battery device and electric equipment. The battery device comprises a battery module and an end plate assembly, the battery module comprises a plurality of battery monomers arranged along a first direction, the end plate assembly comprises an end plate and a pressure sensor, the end plate is arranged on one side of the battery module along the first direction, and the pressure sensor is arranged on one side of the end plate close to the battery module along the first direction. And the pressure sensor is used for detecting the pressure in the battery monomer in the expansion process. According to the battery device, the installation convenience of the pressure sensor is improved, the pressure sensor can be externally connected with other electric devices, and the installation convenience and batch manufacturing feasibility of the battery device can be improved while the expansion degree of the battery monomer can be monitored by utilizing the pressure sensor.

Description

Technical Field

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

[0002] During the charging and discharging process, the battery cells will swell. When the expansion force of the battery cells is too large, it will cause lithium plating on the electrode plates inside the battery and failure of the module frame structure. Therefore, it is necessary to monitor the expansion degree of the battery cells.

[0003] However, traditional batteries suffer from low ease of installation. Utility Model Content

[0004] Therefore, it is necessary to provide a battery device and electrical equipment to address the above technical problems, which can improve the ease of installation of the battery device.

[0005] According to a first aspect of this application, a battery device is provided, the battery device including a battery module and an end plate assembly, the battery module including a plurality of battery cells arranged along a first direction, the end plate assembly including an end plate and a pressure sensor, the end plate being disposed on one side of the battery module along the first direction, and the pressure sensor being disposed on the side of the end plate along the first direction close to the battery module.

[0006] In the technical solution of this application, since the pressure sensor is set on the end plate, the pressure sensor can be integrated on the end plate first, assembled into an end plate assembly, and then the end plate assembly is installed on one side of the battery module. Compared with installing the pressure sensor between the battery cells, this application sets the pressure sensor on the side of the end plate close to the battery module along the first direction, and the pressure sensor is integrated with the end plate. The volume of the end plate is smaller than that of the battery module, which is beneficial to improving the installation convenience of the pressure sensor and also to connecting other electrical components to the pressure sensor. Thus, the pressure sensor can be used to monitor the expansion degree of the battery cells, while also improving the installation convenience and mass production feasibility of the battery device.

[0007] In one embodiment, the end plate has a first plane on the side of the battery module along a first direction, and the pressure sensor is disposed on the first plane.

[0008] The first plane of the end plate can be used to improve the accuracy of the pressure detected by the pressure sensor, reduce the situation where the accuracy of pressure detection is reduced due to unevenness on one side of the pressure sensor, and also reduce the situation where the pressure cannot be accurately detected due to contact between the buffer and the pressure sensor, or the situation where the pressure cannot be collected in time during the early stage of battery cell expansion, thereby helping to improve the detection accuracy of the pressure sensor.

[0009] In one embodiment, the battery cell has large surfaces on opposite sides along a first direction, and the first plane is spaced apart from the large surfaces along the first direction.

[0010] Normally, during the expansion of a battery cell, the side with the larger surface of the battery cell tends to bulge outward, causing the battery cell to swell. By setting the first plane at intervals from the larger surface along the first direction, the pressure sensor on the first plane can be used to better detect the degree of expansion of the battery cell.

[0011] In one embodiment, the pressure sensor is attached to the end plate on the side of the battery module along a first direction.

[0012] This allows the pressure sensor to be stably mounted on the end plate, facilitating the overall movement of the end plate assembly and its installation on one side of the battery module along the first direction. It also helps to better utilize the pressure sensor to monitor the expansion degree of individual battery cells.

[0013] In one embodiment, the endplate assembly further includes a first controller, which is located on the side of the endplate away from the battery module along a first direction, and the pressure sensor and multiple battery cells are electrically connected to the first controller.

[0014] The first controller can be used to acquire pressure signals detected by the pressure sensor, as well as temperature and voltage signals of individual battery cells, so as to monitor the battery module. In addition, integrating the end plate, pressure sensor and first controller together can reduce the occurrence of excessively long external wiring harnesses for the pressure sensor, reduce the difficulty of assembling the battery module and end plate assembly, and thus improve the feasibility and efficiency of mass production of the battery device.

[0015] In one embodiment, the endplate assembly further includes a first connector disposed on the pressure sensor, and the first controller includes a second connector, wherein the pressure sensor and the first controller are detachably electrically connected by means of the first connector and the second connector.

[0016] On the one hand, the pressure sensor and the first controller are electrically connected by the first connector and the second connector, which can improve the connection reliability between the pressure sensor and the first controller and facilitate the first controller to collect the pressure signal detected by the pressure sensor. On the other hand, the first connector and the second connector are detachably electrically connected, which can improve the maintainability of the pressure sensor and the first controller and also improve the feasibility of assembling the pressure sensor in the end plate assembly.

[0017] In one embodiment, the endplate assembly further includes a first electrical connector through which the pressure sensor is electrically connected to a first connector, and the first connector is located on the side of the first controller away from the battery module along a first direction.

[0018] By setting a first electrical connector, the first connector can be located on the side of the first controller away from the battery module along the first direction, which can improve the connection convenience between the first connector and the second connector.

[0019] In one embodiment, the pressure sensor and the first electrical connector are integrally connected; this improves the overall integrity of the pressure sensor and the first electrical connector, thereby improving the ease of installation of the pressure sensor. And / or, the first electrical connector and the first connector are integrally connected. This improves the overall integrity of the first electrical connector and the first connector, thereby improving the ease of installation of the pressure sensor.

[0020] In one embodiment, the first electrical connector includes a first electrical connection segment and a second electrical connection segment spaced apart along a first direction, and a third electrical connection segment connected between the first and second electrical connection segments. The end of the first electrical connection segment away from the third electrical connection segment is electrically connected to a pressure sensor, and the end of the third electrical connection segment away from the third electrical connection segment is electrically connected to a first connector. The end of the third electrical connection segment near the first electrical connection segment extends in a curved manner, and the end of the third electrical connection segment near the second electrical connection segment also extends in a curved manner.

[0021] This improves the strength and toughness of the first electrical connector, thereby enhancing the reliability of the electrical connection between the pressure sensor and the first controller, and enabling the first controller to better acquire the pressure signal detected by the pressure sensor.

[0022] In one embodiment, the battery module has an output terminal, which is spaced apart from the first connector along a second direction, the first direction and the second direction intersecting each other.

[0023] By arranging the output terminals and the first connector at intervals along the second direction, it is convenient for the first connector and the second connector to be electrically connected. This allows the first controller to collect the pressure signal detected by the pressure sensor, while also facilitating the battery module to output power.

[0024] In one embodiment, the first controller is detachably connected to the side of the end plate away from the battery module along a first direction.

[0025] This facilitates the disassembly and assembly of the first controller, and improves the ease of assembly of the end plate assembly and battery device.

[0026] In one embodiment, the battery device further includes an electrical isolator disposed between the end plate and the first controller along a first direction.

[0027] Typically, the end plate is made of metal. Therefore, an electrical isolator is placed between the end plate and the first controller along the first direction. In this way, the end plate and the first controller can be electrically isolated by the electrical isolator, which can improve the reliability of the first controller.

[0028] In one embodiment, the electrical isolator is detachably connected between the end plate and the first controller.

[0029] This facilitates the installation and removal of electrical isolation components, improving the ease of assembly of endplate assemblies and battery devices.

[0030] In one embodiment, the battery device further includes a second controller that is electrically connected to a plurality of battery cells respectively. The second controller is disposed on one side of the battery cells and extends along a first direction and is electrically connected to the first controller.

[0031] The second controller can be used to collect voltage and temperature signals of individual battery cells, and the second controller can transmit voltage and temperature signals to the first controller. In this way, the status of individual battery cells can be well monitored by using the first and second controllers.

[0032] In one embodiment, the second controller includes a third connector, the first controller includes a fourth connector, and the second controller and the first controller are detachably electrically connected by means of the third connector and the fourth connector.

[0033] The third and fourth connectors are detachable for grounding, which improves the convenience of electrical connection between the first and second controllers and also enhances their maintainability.

[0034] In one embodiment, the connection between the first controller and the pressure sensor is spaced apart from the fourth connector along a second direction. The first and second directions intersect each other.

[0035] This facilitates both the electrical connection between the first controller and the second controller, and the electrical connection between the pressure sensor and the first controller.

[0036] In one embodiment, the battery device further includes a first controller and an isolation beam disposed between the first controller and the end plate assembly. The end plate assembly further includes a second electrical connector electrically connected to a pressure sensor, with one end of the second electrical connector, away from the pressure sensor, passing through the isolation beam and electrically connected to the first controller.

[0037] The second electrical connector on the pressure sensor passes through the isolation beam and is electrically connected to the first controller, which can acquire the pressure signal detected by the pressure sensor.

[0038] In one embodiment, the second electrical connector is detachably connected to the end plate.

[0039] The second electrical connector can be temporarily fixed to the end plate to facilitate the movement and assembly of the end plate assembly. After the end plate assembly is moved to the required position, the connection between the second electrical connector and the end plate can be removed so that the pressure sensor can be electrically connected to the first controller through the second electrical connector.

[0040] In one embodiment, the battery device further includes a battery management system located on the side of the isolation beam away from the endplate assembly, and a first controller located on and electrically connected to the battery management system.

[0041] The first controller can be integrated into the battery management system. Since the first controller is electrically connected to the battery management system, the battery management system can also be used to collect pressure signals detected by the pressure sensor. In this way, the battery management system can be used to monitor the status of the battery device.

[0042] In one embodiment, the pressure sensor includes two stacked membrane layers and at least one pressure-sensitive resistor located between the two membrane layers.

[0043] In this way, the sensitivity of the film to dynamic stress can be utilized, and the pressure inside the battery cell during the expansion process can be well detected by using the piezoresistor between the two film layers.

[0044] In one embodiment, each battery cell has a large surface on opposite sides along a first direction. Each large surface has a central region, and the orthographic projection of the central region onto the plane containing the large surface is a first projection. The first projection is constructed as a circle with the center of the large surface as its center and a predetermined length as its radius. At least one varistor's orthographic projection onto the plane containing the large surface is located within the central region of the large surface.

[0045] Typically, during the expansion of a battery cell, the central area of ​​the large surface of the battery cell is more prone to bulging. Therefore, by placing at least one piezoresistive resistor, with its orthographic projection onto the plane containing the large surface, within the central area of ​​the large surface, the degree of expansion of the battery cell can be detected more quickly, thereby improving the timeliness and accuracy of the pressure sensor.

[0046] In one embodiment, the central axis of at least one varistor coincides with the central axis of the large surface.

[0047] In this way, the expansion degree of a single battery cell can be detected more quickly using this pressure-sensitive resistor, which can improve the timeliness and accuracy of the pressure sensor.

[0048] In one embodiment, the pressure sensor includes a plurality of piezoresistors, with each battery cell having a large surface on opposite sides along a first direction, and the orthographic projection of all piezoresistors onto the large surface being within the area of ​​the large surface.

[0049] Multiple pressure-sensitive resistors can be used to better detect the expansion of individual battery cells, thereby improving the detection accuracy of pressure sensors.

[0050] In one embodiment, the pressure sensor includes a plurality of piezoresistors, each battery cell having a large surface on opposite sides along a first direction, and all piezoresistors are arranged in an array with their orthographic projections onto the large surfaces.

[0051] This allows multiple piezoresistors to be evenly distributed on a large surface, which is beneficial for more uniformly detecting the expansion of individual battery cells, thereby improving the detection accuracy of the pressure sensor.

[0052] In one embodiment, the battery device further includes a buffer element, which is spaced apart from the pressure sensor by at least one battery cell.

[0053] The buffer can absorb the expansion force of the battery cells while reducing the possibility of direct contact between the pressure sensor and the buffer. This reduces the likelihood of the pressure sensor failing to accurately detect or collect pressure data in the early stages of battery cell expansion due to direct contact with the buffer, thus improving the detection accuracy of the pressure sensor.

[0054] According to a second aspect of this application, an electrical device is provided, including the battery device of any of the above embodiments.

[0055] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0056] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0057] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of this application is shown.

[0058] Figure 2 A schematic diagram of the battery device according to one embodiment of this application is shown.

[0059] Figure 3 A schematic diagram of the endplate assembly in one embodiment of this application is shown.

[0060] Figure 4An exploded view of an endplate assembly according to one embodiment of this application is shown.

[0061] Figure 5 A schematic diagram of the end plate in one embodiment of this application is shown.

[0062] Figure 6 It shows Figure 2 An enlarged schematic diagram of point A.

[0063] Figure 7 A side view of the first circuit board near the battery module is shown in one embodiment of this application.

[0064] Figure 8 A schematic diagram of the endplate assembly, first circuit board, and battery management system in another embodiment of this application is shown.

[0065] Figure 9 It shows Figure 8 An enlarged schematic diagram of point B.

[0066] Figure 10 A schematic diagram of the pressure sensor and large surface area in another embodiment of this application is shown.

[0067] Reference numerals: 1. Vehicle; 10. Battery assembly; 100. Battery module; 110. Battery cell; 111. Large surface; 101. Output terminal; 200. End plate assembly; 210. End plate; 211. First plane; 212. First snap-fit ​​component; 221. Pressure sensor; 2211. Membrane layer; 2212. Varistor; 222. First connector; 223. First electrical connector; 2231. First electrical connection segment; 2232. Second electrical connection segment; 22 33. Third electrical connection section; 224. Second electrical connection piece; 230. First controller; 231. Second connector; 232. Fourth connector; 223. Third snap-fit ​​piece; 240. Electrical isolation piece; 241. Second snap-fit ​​piece; 300. Second controller; 301. Third connector; 400. Housing; 401. Isolation beam; 402. Housing body; C1. First space; C2. Second space; 500. Battery management system; 20. Motor; 30. Controller. Detailed Implementation

[0068] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0069] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0070] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0071] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0072] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0073] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0074] During the charging and discharging process, the battery cells will swell. When the expansion force of the battery cells is too large, it will cause lithium plating on the electrode plates inside the battery and failure of the module frame structure. Therefore, it is necessary to monitor the expansion degree of the battery cells.

[0075] In related technologies, pressure sensors are usually placed between battery cells, resulting in excessively long wiring harnesses for the pressure sensors. This increases the difficulty of assembling the battery module with other components, leading to the problem of low mass production efficiency in traditional batteries.

[0076] To address the aforementioned technical problems, this application presents a battery device and an electrical appliance that can reduce the difficulty of assembling the battery module with other components, thereby improving the mass production efficiency of the battery device.

[0077] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. These electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, and spacecraft. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft. A power system incorporating the battery device disclosed in this application can be used to construct the electrical device, which facilitates providing power to the device and extends its lifespan.

[0078] Figure 1This illustration shows a structural diagram of a vehicle 1 according to 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. For example, the battery device 10 can be installed 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. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1 but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving force for vehicle 1.

[0079] The interior of vehicle 1 may also be equipped with a motor 20 and a controller 30. The controller 30 is used to control the power supply of the battery device 10 to the motor 20, for example, for the power needs of vehicle 1 during starting, navigation and driving.

[0080] Figure 2 A schematic diagram of the battery device according to one embodiment of this application is shown. Figure 3 A schematic diagram of the endplate assembly in one embodiment of this application is shown. Figure 4 An exploded view of an endplate assembly according to one embodiment of this application is shown.

[0081] Please refer to the following: Figures 2-4 One embodiment of this application provides a battery device 10, including a battery module 100 and an end plate assembly 200.

[0082] The battery module 100 includes multiple battery cells 110 arranged along a first direction F1. The multiple battery cells 110 can be connected in series, in parallel, or in a mixed manner, where a mixed connection refers to a combination of series and parallel connections.

[0083] The end plate assembly 200 includes an end plate 210 and a pressure sensor 221. The end plate 210 is disposed on one side of the battery module 100 along the first direction F1. The pressure sensor 221 is disposed on the side of the end plate 210 along the first direction F1 close to the battery module 100.

[0084] The pressure sensor 221 is used to detect the force exerted by the battery module 100 on the end plate 210 during the expansion process. In turn, the pressure sensor 221 can be used to detect the pressure inside the battery cell 110 during the expansion process, and the degree of expansion of the battery cell 110 can be monitored by the pressure sensor 221.

[0085] End plate 210 refers to a component provided on one side of battery module 100 along the first direction F1 and used to encapsulate battery module 100. Normally, end plates 210 are provided on opposite sides of battery module 100 along the first direction F1. Along the first direction F1, multiple battery cells 110 of battery module 100 are located between two end plates 210.

[0086] Pressure sensor 221 refers to a sensor installed on end plate 210 and used to detect the pressure inside battery cell 110 when battery cell 110 expands.

[0087] Since the pressure sensor 221 is located on the end plate 210, it can be integrated onto the end plate 210 first, assembled into an end plate assembly 200, and then installed on one side of the battery module 100 along the first direction F1. Compared to installing the pressure sensor 221 between the battery cells 110, this application places the pressure sensor 221 on the side of the end plate 210 along the first direction F1 close to the battery module 100, and integrates the pressure sensor 221 with the end plate 210. The volume of the end plate 210 is smaller than that of the battery module 100, which is beneficial to improving the installation convenience of the pressure sensor 221 and also facilitates the connection of the pressure sensor 221 to other electrical components. Thus, the pressure sensor 221 can be used to monitor the expansion degree of the battery cells 110, while also improving the installation convenience and mass production feasibility of the battery device 10.

[0088] Furthermore, compared to installing the pressure sensor 221 between the battery cells 110, this application places the pressure sensor 221 on the side of the end plate 210 close to the battery module 100 along the first direction F1. This can reduce the length of the wiring harness connected to the pressure sensor 221, reducing the difficulty of assembling the battery module 100 with other components due to excessively long wiring harnesses. In this way, the pressure sensor 221 can be used to monitor the expansion degree of the battery cells 110, while also improving the feasibility and efficiency of mass production of the battery device 10.

[0089] In some embodiments, such as Figure 5 As shown, the end plate 210 has a first plane 211 on the side of the battery module 100 along the first direction F1, and the pressure sensor 221 is disposed on the first plane 211.

[0090] The first plane 211 refers to the plane located on the end plate 210 along the first direction F1 near the battery module 100.

[0091] Compared to the pressure sensor 221 and the buffer being located between the battery cells 110, this application places the pressure sensor 221 on the first plane 211 of the end plate 210. The first plane 211 of the end plate 210 can be used to improve the accuracy of the pressure detected by the pressure sensor 221, reduce the situation where the accuracy of pressure detection is reduced due to unevenness on one side of the pressure sensor 221, and also reduce the situation where the pressure cannot be accurately detected due to contact between the buffer and the pressure sensor 221, or the situation where the pressure cannot be collected in time during the early stage of expansion of the battery cell 110, thereby improving the detection accuracy of the pressure sensor 221.

[0092] In some embodiments, the battery cell 110 has large surfaces 111 on opposite sides along the first direction F1, and the first plane 211 is spaced apart from the large surfaces 111 along the first direction F1.

[0093] Large surface 111 refers to the larger side surface of the battery cell 110.

[0094] In this embodiment, the first plane 211 is arranged parallel to the large surface 111.

[0095] Normally, during the expansion of the battery cell 110, the side of the battery cell 110 with the large surface 111 tends to bulge outward, causing the battery cell 110 to be in a bulging state. By setting the first plane 211 at intervals with the large surface 111 along the first direction F1, the pressure sensor 221 on the first plane 211 can be used to better detect the degree of expansion of the battery cell 110.

[0096] In some embodiments, the pressure sensor 221 is attached to the end plate 210 on the side near the battery module 100 along the first direction F1.

[0097] Of course, this application is not limited to this. The pressure sensor 221 can also be fixed to the side of the end plate 210 along the first direction F1 close to the battery module 100 in other ways. In this way, the pressure sensor 221 can be stably installed on the end plate 210, which makes it easier for the end plate assembly 200 to be moved as a whole and installed on the side of the battery module 100 along the first direction F1. It is also beneficial to better use the pressure sensor 221 to monitor the expansion degree of the battery cell 110.

[0098] In some embodiments, the end plate assembly 200 further includes a first controller 230, which is located on the side of the end plate 210 away from the battery module 100 along a first direction F1. The pressure sensor 221 and the plurality of battery cells 110 are all electrically connected to the first controller 230.

[0099] The first controller 230 is a controller that is electrically connected to the pressure sensor 221 and the multiple battery cells 110 respectively. It can be used to collect the pressure signal detected by the pressure sensor 221, and can also be used to collect the temperature signal and voltage signal of the battery cells 110. The first controller 230 can be a circuit board. For example, the first controller 230 is a rigid circuit board.

[0100] The first controller 230 can be used to acquire the pressure signal detected by the pressure sensor 221, and can also be used to acquire the temperature and voltage signals of the battery cells 110, so as to monitor the battery module 100 using the first controller 230. In addition, by integrating the end plate 210, the pressure sensor 221 and the first controller 230 together, the problem of excessively long external wiring harnesses for the pressure sensor 221 can be reduced, thereby reducing the difficulty of assembling the battery module 100 and the end plate assembly 200, and thus improving the feasibility and efficiency of mass production of the battery device 10.

[0101] In some embodiments, the endplate assembly 200 further includes a first connector 222 disposed on the pressure sensor 221, and the first controller 230 includes a second connector 231, wherein the pressure sensor 221 and the first controller 230 are detachably electrically connected by means of the first connector 222 and the second connector 231.

[0102] One of the first connector 222 and the second connector 231 may be a first male connector, and the other of the first connector 222 and the second connector 231 may be a first female connector that is compatible with the first male connector.

[0103] Thus, on the one hand, the pressure sensor 221 and the first controller 230 are electrically connected by the first connector 222 and the second connector 231, which can improve the connection reliability between the pressure sensor 221 and the first controller 230, and also facilitate the first controller 230 to collect the pressure signal detected by the pressure sensor 221; on the other hand, the first connector 222 and the second connector 231 are detachably electrically connected, which can improve the maintainability of the pressure sensor 221 and the first controller 230, and also improve the feasibility of assembling the pressure sensor 221 in the end plate assembly 200.

[0104] In some embodiments, the end plate assembly 200 further includes a first electrical connector 223, through which the pressure sensor 221 is electrically connected to a first connector 222, and the first connector 222 is located on the side of the first controller 230 away from the battery module 100 along a first direction F1.

[0105] The first electrical connector 223 refers to a component used for electrically connecting the pressure sensor 221 and the first connector 222. For example, the first electrical connector 223 is a first wire harness.

[0106] By setting the first electrical connector 223, the first connector 222 can be located on the side of the first controller 230 away from the battery module 100 along the first direction F1, which can improve the connection convenience between the first connector 222 and the second connector 231.

[0107] In some embodiments, the pressure sensor 221 and the first electrical connector 223 are integrated.

[0108] This improves the overall integrity of the pressure sensor 221 and the first electrical connector 223, thereby enhancing the ease of installation of the pressure sensor 221.

[0109] In some embodiments, the first electrical connector 223 and the first connector 222 are integrally connected.

[0110] This improves the overall integrity of the first electrical connector 223 and the first connector 222, thereby enhancing the ease of installation of the pressure sensor 221.

[0111] In some embodiments, the first electrical connector 223 includes a first electrical connection segment 2231 and a second electrical connection segment 2232 spaced apart along a first direction F1, and a third electrical connection segment 2233 connected between the first electrical connection segment 2231 and the second electrical connection segment 2232. The end of the first electrical connection segment 2231 away from the third electrical connection segment 2233 is electrically connected to the pressure sensor 221, and the end of the third electrical connection segment 2233 away from the third electrical connection segment 2233 is electrically connected to the first connector 222; the end of the third electrical connection segment 2233 near the first electrical connection segment 2231 extends in a curved manner; the end of the third electrical connection segment 2233 near the second electrical connection segment 2232 also extends in a curved manner.

[0112] The first electrical connection segment 2231 refers to the segment on the first electrical connector 223 that is electrically connected to the pressure sensor 221.

[0113] The second electrical connection segment 2232 refers to a segment on the first electrical connector 223 that is electrically connected to the first connector 222.

[0114] The third electrical connection segment 2233 refers to a segment on the first electrical connector 223 that is connected between the first electrical connection segment 2231 and the second electrical connection segment 2232.

[0115] It is possible that the third electrical connection segment 2233 is curved and extended in an arc shape at one end near the first electrical connection segment 2231; or the third electrical connection segment 2233 is curved and extended in an arc shape at one end near the second electrical connection segment 2232.

[0116] This improves the strength and toughness of the first electrical connector 223, thereby enhancing the reliability of the electrical connection between the pressure sensor 221 and the first controller 230, and enabling the first controller 230 to better acquire the pressure signal detected by the pressure sensor 221.

[0117] In some embodiments, please refer to Figure 6 The battery module 100 has an output terminal 101, which is arranged at intervals with the first connector 222 along the second direction F2. The first direction F1 and the second direction F2 intersect each other.

[0118] Output terminal 101 refers to the terminal on the battery module 100 used for outputting power, which can be a positive terminal or a negative terminal.

[0119] By arranging the output terminal 101 and the first connector 222 at intervals along the second direction F2, it is convenient for the first connector 222 and the second connector 231 to be electrically connected. This allows the first controller 230 to collect the pressure signal detected by the pressure sensor 221, while also facilitating the battery module 100 to output power.

[0120] In some embodiments, the battery module 100 is provided with end plate assemblies 200 on opposite sides along the first direction F1, and the battery module 100 has output terminals 101 on opposite sides along the first direction F1. The output terminal 101 on one side and the first connector 222 of the same side end plate assembly 200 are arranged at intervals along the second direction F2, and the output terminal 101 on the other side and the first connector 222 of the same side end plate assembly 200 are arranged at intervals along the second direction F2.

[0121] The two output terminals 101 located on both sides are the positive terminal and the negative terminal, which facilitates the battery module 100 to output power to the outside, and also facilitates the use of the first controller 230 to collect the pressure signal detected by the pressure sensor 221.

[0122] In some embodiments, the first controller 230 is detachably connected to the side of the end plate 210 away from the battery module 100 along a first direction.

[0123] The first controller 230 can be connected to the end plate 210 on the side away from the battery module 100 along the first direction by a snap-fit ​​connection. Alternatively, the first controller 230 can be connected to the end plate 210 on the side away from the battery module 100 along the first direction by a bolt connection.

[0124] This facilitates the assembly and disassembly of the first controller 230, thereby improving the ease of assembly of the end plate assembly 200 and the battery device 10.

[0125] In some embodiments, the battery device 10 further includes an electrical isolation member 240 disposed between the end plate 210 and the first controller 230 along a first direction F1.

[0126] Electrical isolator 240 refers to a component used to electrically isolate end plate 210 and first controller 230. Electrical isolator 240 may be made of plastic or other insulating materials. Electrical isolator 240 is generally plate-shaped.

[0127] Normally, the end plate 210 is made of metal. Therefore, along the first direction F1, the electrical isolation component 240 is disposed between the end plate 210 and the first controller 230. In this way, the electrical isolation component 240 can be used to electrically isolate the end plate 210 and the first controller 230, thereby improving the reliability of the first controller 230.

[0128] In some embodiments, the electrical isolator 240 is detachably connected between the end plate 210 and the first controller 230.

[0129] The electrical isolator 240 can be connected between the end plate 210 and the first controller 230 by snap-fit. Alternatively, the electrical isolator 240 can be connected between the end plate 210 and the first controller 230 by bolts.

[0130] For example, such as Figure 4 As shown, the end plate 210 includes a first latching member 212 connected along the first direction F1 to the side of the first plane 211 facing away from the battery module 100, and the electrical isolation member 240 includes a second latching member 241, as shown. Figure 7 As shown, the first controller 230 includes a third connector 223. The first connector 212 is engaged with the second connector 241 on one side along the first direction F1, and the first connector 212 is engaged with the third connector 223 on the other side along the first direction F1.

[0131] The second connector 231, the fourth connector 232, and the third snap-fit ​​connector 223 are each set independently.

[0132] This facilitates the assembly and disassembly of the electrical isolation component 240, thereby improving the ease of assembly of the end plate assembly 200 and the battery device 10.

[0133] In some embodiments, the battery device 10 further includes a second controller 300 that is electrically connected to a plurality of battery cells 110 respectively. The second controller 300 is disposed on one side of the battery cell 110 and extends along a first direction F1, and is electrically connected to the first controller 230.

[0134] The second controller 300 is used to acquire the voltage and temperature signals of the battery cell 110.

[0135] For example, the second controller 300 may be a flexible circuit board.

[0136] The second controller 300 can be located on the top side of the battery cell 110, so that the second controller 300 can be electrically connected to multiple battery cells 110 and the first controller 230 respectively.

[0137] The second controller 300 can be used to collect the voltage and temperature signals of the battery cell 110, and the second controller 300 can transmit the voltage and temperature signals with the first controller 230. In this way, the first controller 230 and the second controller 300 can be used to monitor the status of the battery cell 110.

[0138] In some embodiments, the second controller 300 includes a third connector 301, the first controller 230 includes a fourth connector 232, and the second controller 300 and the first controller 230 are detachably electrically connected by means of the third connector 301 and the fourth connector 232.

[0139] Among them, the first direction F1 and the second direction F2 intersect each other.

[0140] One of the third connector 301 and the fourth connector 232 may be a second male connector, and the other of the third connector 301 and the fourth connector 232 may be a second female connector that is compatible with the second male connector.

[0141] It should be noted that the fourth connector 232 and the second connector 231 are independent of each other.

[0142] The third connector 301 and the fourth connector 232 are detachably grounded, which can improve the convenience of electrical connection between the first controller 230 and the second controller 300, and also improve the maintainability of the first controller 230 and the second controller 300.

[0143] In some embodiments, the connection between the first controller 230 and the pressure sensor 221 is spaced apart from the fourth connector 232 along the second direction F2.

[0144] The first direction F1 and the second direction F2 can be perpendicular to each other. For example, the first direction F1 is parallel to the thickness direction of the battery cell 110, and the second direction F2 is parallel to the width direction of the battery cell 110.

[0145] Since the connection between the first controller 230 and the pressure sensor 221 is arranged at intervals with the fourth connector 232 along the second direction F2, it is convenient for the first controller 230 to be electrically connected to the second controller 300, and also convenient for the pressure sensor 221 to be electrically connected to the first controller 230.

[0146] In other embodiments, the battery device 10 further includes a first controller 230 and an isolation beam 401, the isolation beam 401 being disposed between the first controller 230 and the end plate assembly 200; the end plate assembly 200 further includes a second electrical connector 224 electrically connected to the pressure sensor 221, one end of the second electrical connector 224 being away from the pressure sensor 221 passing through the isolation beam 401 and electrically connected to the first controller 230.

[0147] The isolation beam 401 refers to the beam on the battery device 10 used to separate the first controller 230 and the end plate assembly 200.

[0148] The pressure sensor 221 can be integrated with the second electrical connector 224.

[0149] The second electrical connector 224 on the pressure sensor 221 passes through the isolation beam 401 and is electrically connected to the first controller 230, which can acquire the pressure signal detected by the pressure sensor 221.

[0150] In some embodiments, the second electrical connector 224 is detachably connected to the end plate 210.

[0151] The second electrical connector 224 can be a second wiring harness. The second electrical connector 224 can be temporarily fixed on the end plate 210 to facilitate the movement and assembly of the end plate assembly 200. After the end plate assembly 200 is moved to the required position, the connection between the second electrical connector 224 and the end plate 210 can be removed so that the pressure sensor 221 can be electrically connected to the first controller 230 through the second electrical connector 224.

[0152] In some embodiments, the battery device 10 further includes a battery management system 500, which is located on the side of the isolation beam 401 away from the end plate assembly 200. A first controller 230 is located on the battery management system 500 and is electrically connected to the battery management system 500.

[0153] The battery management system 500, or BMS for short, is used to monitor the status of the battery device 10.

[0154] The first controller 230 can be integrated into the battery management system 500. Since the first controller 230 is electrically connected to the battery management system 500, the battery management system 500 can also be used to collect the pressure signal detected by the pressure sensor 221. In this way, the battery management system 500 can be used to monitor the status of the battery device 10.

[0155] In some embodiments, the second controller 300 is detachably electrically connected to the first controller 230.

[0156] In this way, the battery management system 500 can also be used to collect the temperature and voltage signals of the battery cells 110.

[0157] In some embodiments, in conjunction with reference Figure 8 and Figure 9 The battery device 10 also includes a housing 400, which includes a housing body 402 and the aforementioned isolation beam 401. The isolation beam 401 is disposed within the housing body 402 and is integrally formed with the housing body 402. The isolation beam 401 divides the space within the housing body 402 into a first space C1 and a second space C2. The battery module 100 and the end plate assembly 200 are located in the first space C1, and the first controller 230 and the battery management system 500 are located in the second space C2.

[0158] In this way, the first controller 230 and the battery management system 500 can be housed in the second space C2, and the first controller 230 and the battery management system 500 can be placed separately from the battery module 100 and the end plate assembly 200 in the first space C1.

[0159] In some embodiments, the pressure sensor 221 includes two stacked membrane layers 2211 and at least one pressure-sensitive resistor 2212 located between the two membrane layers 2211.

[0160] The membrane layer 2211 may be a thin film, and the two membrane layers 2211 are used to sandwich at least one piezoresistor 2212 therein, so as to use the piezoresistor 2212 between the two membrane layers 2211 to detect the pressure inside the battery cell 110 during the expansion process.

[0161] In this way, the sensitivity of the membrane layer 2211 to dynamic stress can be utilized, and the pressure inside the battery cell 110 during the expansion process can be well detected by the piezoresistor 2212 between the two membrane layers 2211.

[0162] In some embodiments, the battery cell 110 has large surfaces 111 on opposite sides along the first direction F1. Each large surface 111 has a central region, and the orthographic projection of the central region onto the plane containing the large surface 111 is a first projection. The first projection is a circle with the center of the large surface 111 as its center and a radius of a preset length. At least one varistor 2212 has its orthographic projection onto the plane containing the large surface 111 located within the central region of the large surface 111.

[0163] The central area refers to the area located at the center of the large surface 111.

[0164] Normally, during the expansion of a single battery cell 110, the central region of the large surface 111 of the single battery cell 110 is more prone to bulging. Therefore, by placing the orthographic projection of at least one pressure-sensitive resistor 2212 onto the central region of the plane containing the large surface 111, the degree of expansion of the single battery cell 110 can be detected more quickly using the pressure-sensitive resistor 2212, thereby improving the detection timeliness and accuracy of the pressure sensor 221.

[0165] In some embodiments, the central axis of at least one varistor 2212 coincides with the central axis of the large surface 111.

[0166] In this way, the pressure-sensitive resistor 2212 can be used to detect the degree of expansion of the battery cell 110 more quickly, which can improve the detection timeliness and detection accuracy of the pressure sensor 221.

[0167] In some embodiments, such as Figure 10 As shown, the pressure sensor 221 includes multiple pressure-sensitive resistors 2212. The battery cell 110 has large surfaces 111 on opposite sides along the first direction F1. The orthographic projection of all pressure-sensitive resistors 2212 on the large surfaces 111 is located within the range of the large surfaces 111.

[0168] Multiple pressure-sensitive resistors 2212 can be used to better detect the expansion degree of the battery cell 110, thereby improving the detection accuracy of the pressure sensor 221.

[0169] In some embodiments, such as Figure 10 As shown, the pressure sensor 221 includes multiple pressure-sensitive resistors 2212. The battery cell 110 has large surfaces 111 on opposite sides along the first direction F1. The orthographic projections of all the pressure-sensitive resistors 2212 on the large surfaces 111 are arranged in an array.

[0170] This allows multiple pressure-sensitive resistors 2212 to be evenly distributed on the large surface 111, which is beneficial for more uniformly detecting the expansion degree of the battery cell 110, thereby improving the detection accuracy of the pressure sensor 221.

[0171] In some embodiments, the battery device 10 further includes a buffer, which is spaced apart from the pressure sensor 221 by at least one battery cell 110.

[0172] A buffer is a component on the battery device 10 used to absorb the expansion force of the battery cell 110.

[0173] A buffer can be provided between two adjacent battery cells 110.

[0174] The buffer is positioned at a distance from the pressure sensor 221 through at least one battery cell 110. In this way, the buffer can absorb the expansion force of the battery cell 110 while reducing the possibility of direct contact between the pressure sensor 221 and the buffer. This reduces the possibility of the pressure sensor 221 failing to accurately detect or collect pressure in the early stage of the battery cell 110 expansion due to direct contact with the buffer, thereby improving the detection accuracy of the pressure sensor 221.

[0175] In some embodiments, the end plate assembly 200 includes an end plate 210, a pressure sensor 221, and a first controller 230. The first controller 230 can be used to acquire the pressure signal detected by the pressure sensor 221 in order to monitor the battery module 100. Furthermore, integrating the end plate 210, the pressure sensor 221, and the first controller 230 together can reduce the occurrence of excessively long wiring harnesses connected to the pressure sensor 221, thereby reducing the assembly difficulty of the battery module 100 and the end plate assembly 200, and thus improving the feasibility and efficiency of mass production of the battery device 10.

[0176] One embodiment of this application provides an electrical device including the battery device 10 of any of the above embodiments.

[0177] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0178] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery device, characterized by, The battery device comprises: a battery module (100) comprising a plurality of battery cells (110) arranged along a first direction; and an end plate assembly (200) comprising: an end plate (210) arranged at one side of the battery module (100) along the first direction; and a pressure sensor (221) arranged at one side of the end plate (210) along the first direction close to the battery module (100).

2. The battery device according to claim 1, characterized by The end plate (210) has a first plane (211) at one side along the first direction close to the battery module (100), and the pressure sensor (221) is arranged on the first plane (211).

3. The battery device of claim 2, wherein, The battery cell (110) has a large face (111) at each of opposite sides along the first direction, and the first plane (211) is arranged apart from the large face (111) along the first direction.

4. The battery device of claim 1, wherein The pressure sensor (221) is bonded to one side of the end plate (210) along the first direction close to the battery module (100).

5. The battery device according to any one of claims 1 to 4, characterized by, The end plate assembly (200) further comprises a first controller (230); The first controller (230) is arranged at one side of the end plate (210) along the first direction away from the battery module (100); The pressure sensor (221) and the plurality of battery cells (110) are electrically connected to the first controller (230).

6. The battery device of claim 5, wherein The end plate assembly (200) further comprises a first connector (222) arranged on the pressure sensor (221), and the first controller (230) comprises a second connector (231); The pressure sensor (221) and the first controller (230) are detachably electrically connected by means of the first connector (222) and the second connector (231).

7. The battery device of claim 6, wherein The end plate assembly (200) further comprises a first electrical connecting member (223); The pressure sensor (221) is electrically connected to the first connector (222) through the first electrical connecting member (223), and the first connector (222) is located at one side of the first controller (230) along the first direction away from the battery module (100).

8. The battery device of claim 7, wherein, The pressure sensor (221) and the first electrical connecting member (223) are integrally connected; and / or The first electrical connecting member (223) and the first connector (222) are integrally connected.

9. The battery device of claim 8, wherein, The first electrical connecting member (223) comprises a first electrical connecting section (2231) and a second electrical connecting section (2232) arranged apart along the first direction, and a third electrical connecting section (2233) connected between the first electrical connecting section (2231) and the second electrical connecting section (2232); One end of the first electrical connecting section (2231) away from the third electrical connecting section (2233) is electrically connected to the pressure sensor (221), and one end of the third electrical connecting section (2233) away from the third electrical connecting section (2233) is electrically connected to the first connector (222); The third electric connection section (2233) is arranged to extend in a curved manner near one end of the first electric connection section (2231); The third electric connection section (2233) is arranged to extend in a curved manner near one end of the second electric connection section (2232).

10. The battery device of claim 6, wherein, The battery module (100) has an output terminal (101) arranged to be spaced apart from the first connector (222) in a second direction; The first direction and the second direction intersect with each other.

11. The battery device of claim 5, wherein, The first controller (230) is detachably connected to a side of the end plate (210) away from the battery module (100) in the first direction.

12. The battery device of claim 5, wherein, The battery device further comprises: An electric isolation member (240) arranged between the end plate (210) and the first controller (230) in the first direction.

13. The battery device of claim 12, wherein, The electric isolation member (240) is detachably connected between the end plate (210) and the first controller (230).

14. The battery device of claim 5, wherein, The battery device further comprises a second controller (300) electrically connected to the plurality of battery cells (110) respectively; The second controller (300) is arranged on a side of the battery cells (110) and extends in the first direction, and is electrically connected to the first controller (230).

15. The battery device of claim 14, wherein, The second controller (300) comprises a third connector (301), and the first controller (230) comprises a fourth connector (232); The second controller (300) and the first controller (230) are detachably electrically connected by means of the third connector (301) and the fourth connector (232).

16. The battery device of claim 15, wherein, The connection between the first controller (230) and the pressure sensor (221) is spaced apart from the fourth connector (232) in a second direction; The first direction and the second direction intersect with each other.

17. The battery device of any one of claims 1-4, wherein, The battery device further comprises: A first controller (230) and an isolation beam (401) arranged between the first controller (230) and the end plate assembly (200); The end plate assembly (200) further comprises a second electric connection member (224) electrically connected to the pressure sensor (221), and an end of the second electric connection member (224) away from the pressure sensor (221) penetrates through the isolation beam (401) and is electrically connected to the first controller (230).

18. The battery device of claim 17, wherein, The second electric connection member (224) is detachably connected to the end plate (210).

19. The battery device of claim 17, wherein, The battery device further comprises a battery management system (500) arranged on a side of the isolation beam (401) away from the end plate assembly (200); The first controller (230) is arranged on the battery management system (500) and is electrically connected to the battery management system (500).

20. The battery device of any one of claims 1-4, wherein, The pressure sensor (221) comprises two layers of film layers (2211) arranged in a stacked manner, and at least one pressure-sensitive resistor (2212) located between the two layers of film layers (2211).

21. The battery device of claim 20, wherein, The battery monomer (110) has a large face (111) on each side along the first direction, and the large face (111) has a central area, and a first projection of the central area in the plane of the large face (111) is configured as a circle with the center of the large face (111) as the center and a preset length as the radius. At least one of the pressure-sensitive resistors (2212) is located in the central area of the large face (111) in the projection of the plane of the large face (111).

22. The battery device of claim 21, wherein, The central axis of at least one of the pressure-sensitive resistors (2212) coincides with the central axis of the large face (111).

23. The battery device of claim 20, wherein, The pressure sensor (221) comprises a plurality of the pressure-sensitive resistors (2212). The battery monomer (110) has a large face (111) on each side along the first direction, and the projection of all the pressure-sensitive resistors (2212) on the large face (111) is located in the range of the large face (111).

24. The battery device of claim 20, wherein, The pressure sensor (221) comprises a plurality of the pressure-sensitive resistors (2212). The battery monomer (110) has a large face (111) on each side along the first direction, and the projection of all the pressure-sensitive resistors (2212) on the large face (111) is arranged in an array.

25. The battery device of any one of claims 1-4, wherein, The battery device further comprises a buffer. The buffer is arranged to be spaced from the pressure sensor (221) by at least one of the battery monomers (110).

26. An electrical device, comprising: The battery device comprises any one of the battery devices according to claims 1-25.

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