Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device. The battery device comprises a box body, a battery monomer assembly and a first sensor, the battery monomer assembly is arranged in the box body, the battery monomer assembly comprises at least one battery monomer, the battery monomer comprises a shell, the shell comprises a first wall, and the surface, perpendicular to the thickness direction of the first wall, of the battery monomer is the surface, with the largest area, of the battery monomer. The first sensor is arranged on the outer surface of the first wall and is used for detecting the expansion force of the battery monomer; according to the technical scheme, the reliability of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and more specifically, to a battery device and an electrical device. Background Technology

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

[0003] In the development of battery device technology, how to improve the reliability of battery devices is a technical problem that urgently needs to be solved. Utility Model Content

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

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, this application provides a battery device, which includes a housing, a battery cell assembly, and a first sensor. The battery cell assembly is disposed within the housing and includes at least one battery cell. Each battery cell includes a housing with a first wall. The surface of the battery cell perpendicular to the thickness direction of the first wall is the surface with the largest area of ​​the battery cell. The first sensor is disposed on the outer surface of the first wall and is used to detect the expansion force of the battery cell.

[0007] The technical solution of this application embodiment involves setting a first sensor on the first wall of the battery cell. This first sensor detects changes in the expansion force of the battery cell in real time. When the expansion force exceeds a normal threshold, it can provide real-time feedback on the abnormal situation of the battery cell, allowing for early intervention measures to be taken to reduce the risk of damage to the battery device and thus improve its reliability. Simultaneously, the surface of the battery cell perpendicular to the thickness direction of the first wall is the surface with the largest area of ​​the battery cell; that is, the first wall is the large surface of the battery cell. The large surface of the battery cell expands significantly. Setting the first sensor on the first wall enables the first sensor to accurately detect the expansion force of the battery cell, thereby improving the accuracy of the first sensor's detection of expansion force.

[0008] In some embodiments, the battery device includes a first connector and a battery management system, the first connector connecting a first sensor and the battery management system to transmit detection information from the first sensor to the battery management system.

[0009] The technical solution of this application embodiment connects a first sensor and a battery management system through a first connector, transmitting the detection information of the first sensor to the battery management system. This enables the battery management system to process and provide feedback on the detection information of the first sensor, allowing for early intervention measures to be taken for the battery device, reducing the risk of damage to the battery device, and thus improving the reliability of the battery device.

[0010] In some embodiments, the battery cell further includes electrode terminals, the housing includes a second wall, the electrode terminals are disposed on the second wall, and at least a portion of the first connector is disposed between the outer surface of the second wall and the inner surface of the housing in the thickness direction of the second wall.

[0011] In the technical solution of this application embodiment, the electrode terminal has a certain size in the thickness direction of the second wall, and at least a portion of the first connector is disposed between the outer surface of the second wall and the inner surface of the housing, so that at least a portion of the first connector shares space with the electrode terminal in the thickness direction of the second wall, making the spatial arrangement of the first connector more reasonable, which is conducive to improving the space utilization of the battery device, thereby improving the energy density of the battery device.

[0012] In some embodiments, the battery device includes an adhesive element that connects a first connector and a second wall.

[0013] The technical solution of this application embodiment connects the first connector and the second wall with an adhesive, which improves the convenience of fixing the first connector and reduces the risk of the first connector moving inside the box and interfering with other components inside the box, thereby improving the reliability of the battery device.

[0014] In some embodiments, there are multiple battery cells arranged along the thickness direction of the first wall, and multiple first sensors connected to the first connector. Each first sensor is disposed in a battery cell, and the number of first sensors is less than or equal to the number of battery cells.

[0015] The technical solution of this application embodiment, by setting multiple first sensors, improves the accuracy and real-time performance of the first sensors in detecting the expansion force of battery cells, thereby improving the reliability of the battery device. Simultaneously, the number of first sensors is less than the number of battery cells, resulting in a smaller number of first sensors and reducing costs.

[0016] In some embodiments, there are multiple battery cells arranged along the thickness direction of the first wall, and one first sensor is disposed in the battery cell located in the middle region of the multiple battery cells along the thickness direction of the first wall.

[0017] The technical solution of this application embodiment uses a single first sensor to detect the expansion force of a battery cell, reducing the number of first sensors and thus lowering costs. Furthermore, placing the first sensor in the middle region of a battery cell improves the accuracy and real-time performance of detecting the expansion force of other battery cells, thereby enhancing the reliability of the battery device.

[0018] In some embodiments, the battery device further includes a second sensor disposed within the housing. The second sensor is used to detect the temperature or voltage of a single battery cell. A first connector connects the second sensor and the battery management system to transmit the detection information from the second sensor to the battery management system.

[0019] The technical solution of this application embodiment connects a first sensor that detects the expansion force of a battery cell and a battery management system through a first connector, and connects a second sensor that detects the temperature or voltage of a battery cell and a battery management system through the first connector. That is, both the first sensor and the second sensor are connected to the first connector, which can make the integration of the first connector better, thereby reducing the number of the first connectors, which is conducive to improving the space utilization of the battery device, and thus improving the energy density of the battery device.

[0020] In some embodiments, the battery device further includes a second sensor and a second connector. The second sensor is disposed inside the housing and is used to detect the temperature or voltage of a single battery cell. The second connector connects the second sensor and the battery management system to transmit the detection information from the second sensor to the battery management system.

[0021] The technical solution of this application embodiment connects a first sensor that detects the expansion force of a battery cell and a battery management system through a first connector, and connects a second sensor that detects the temperature or voltage of a battery cell and a battery management system through a second connector. This reduces the risk of mutual interference between the information transmission of the first sensor and the information transmission of the second sensor, and facilitates the maintenance and repair of the information transmission of the first sensor and the information transmission of the second sensor in the battery device.

[0022] In some embodiments, there are multiple first sensors and multiple first connectors, each first connector being connected to a battery management system and a first sensor to transmit the detection information of the first sensor to the battery management system.

[0023] In the technical solution of this application embodiment, each first connector is connected to a battery management system and a first sensor, which reduces the risk of mutual interference between the information transmission of each first sensor and facilitates the maintenance and repair of the information transmission of each first sensor by the battery device.

[0024] In some embodiments, the output end of the first sensor is provided with a first quick-connect terminal, and the first connector has a second quick-connect terminal that matches the first quick-connect terminal. The first quick-connect terminal and the second quick-connect terminal are connected to each other to connect the first sensor and the first connector.

[0025] The technical solution of this application embodiment is that the quick-connect terminal is relatively simple and quick to install, has high reliability, and is relatively easy to maintain. The connection between the first connector and the first sensor is realized through the first quick-connect terminal and the second quick-connect terminal, which helps to improve the convenience of connection and maintenance of the first sensor and the first connector, and also helps to improve the reliability of the connection between the first sensor and the first connector.

[0026] In some embodiments, the output terminal of the first sensor is welded to the first connector to connect the first sensor and the first connector.

[0027] The technical solution of this application embodiment has a high temperature reliability in welding effect, low welding cost, and strong high temperature resistance at the welded joint. By welding the output end of the first sensor to the first connector, the reliability of the connection between the first sensor and the first connector is improved, and costs are saved.

[0028] In some embodiments, the first connector is a circuit board; or, the first connector is a wire.

[0029] The technical solution of this application embodiment features a lightweight and thin circuit board with good flexibility and adaptability, and high integration density. By setting the first connector as a circuit board, the first connector has better reliability, which is beneficial to improving the energy density of the battery device. The wires have good flexibility and durability, and are easy to install. By setting the first connector as a wire, the first connector has better reliability, which is beneficial to improving the convenience of installation of the first connector.

[0030] In some embodiments, the housing includes a bottom wall, an end cap, and a plurality of side walls. The side walls surround the outer periphery of the bottom wall, with one end of each side wall connected to the bottom wall and the other end forming an opening, which is closed by the end cap. The plurality of side walls includes a first sub-side wall disposed opposite to the first wall in the thickness direction. The surface area of ​​the first sub-side wall is greater than the surface area of ​​the end cap, the surface area of ​​the bottom wall, and the surface areas of the other side walls among the plurality of side walls. The first sub-side wall is the first wall.

[0031] In the technical solution of this application embodiment, the surface area of ​​the first sub-sidewall is greater than the surface area of ​​the end cap, the surface area of ​​the bottom wall, and the surface area of ​​other sidewalls among the multiple sidewalls. That is, the first sub-sidewall is the large surface of the battery cell. The large surface of the battery cell has a large degree of expansion. By setting the first sensor on the first sub-sidewall, the first sensor can more accurately detect the expansion force of the battery cell, which is beneficial to improving the accuracy of the first sensor in detecting the expansion force.

[0032] Secondly, this application also provides an electrical device, including a battery device according to any embodiment of the first aspect, the battery device being used to provide electrical energy.

[0033] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0036] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0037] Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0038] Figure 4 This is a connection diagram of the first connector provided in some embodiments of this application;

[0039] Figure 5 A connection diagram of the first connector provided in other embodiments of this application;

[0040] Figure 6 A connection diagram of the first connector provided in some embodiments of this application;

[0041] Figure 7 A schematic diagram showing the connection between the first connector and the first sensor from another perspective, provided for some embodiments of this application;

[0042] Figure 8 This is an exploded view of the structure connecting the first connector and the first sensor as provided in some embodiments of this application.

[0043] Icons: 1-Battery assembly; 10-Casing; 11-First sub-casing; 12-Second sub-casing; 20-Battery cell assembly; 21-Battery cell; 211-Casing; 2111-First wall; 2112-Second wall; 2113-Bottom wall; 2114-End cap; 2115-Side wall; 2115a-First sub-side wall; 2115b-Second sub-side wall; 2116-Housing; 212-Electrode terminal; 213-Electrode assembly; 30-First sensor; 31-First quick-connect terminal; 40-First connector; 41-Second quick-connect terminal; 50-Battery management system; 60-Adhesive; 70-Second sensor; 80-Second connector; X-Thickness direction of the first wall; Y-Thickness direction of the second wall; 100-Vehicle; 110-Controller; 120-Motor. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0046] In this application, the reference to "embodiment" means that a specific 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0048] 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 the second direction can represent three cases: A existing alone, A and the second direction existing simultaneously, and the second direction existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0049] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0050] 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.

[0051] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0052] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0053] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0054] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0055] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked 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 sub-enclosure may be a top cover or a bottom plate.

[0056] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0057] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0058] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0059] 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.

[0060] The battery cell may be, but is not limited to, 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.

[0061] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. 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.

[0062] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0063] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0064] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0065] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0066] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0067] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.

[0068] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0069] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in batteries. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0070] In some embodiments, the separator is a diaphragm. This application does not impose any particular limitation on the type of diaphragm; any known porous diaphragm with good chemical and mechanical stability can be selected.

[0071] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0072] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0073] Currently, judging from market trends, battery devices are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in power tools, drones, energy storage equipment, and many other fields. As the application areas of battery devices continue to expand, the market demand is also constantly increasing.

[0074] The development of battery device technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, the reliability of battery devices is also a key consideration as environmental conditions and / or internal battery conditions change.

[0075] Currently, battery cells are housed within a casing to form a battery device. A battery cell assembly comprises multiple battery cells arranged in the same direction. During charging and discharging, the electrode assembly undergoes an electrochemical reaction with the electrolyte, generating gas inside the battery cell. This causes the electrode assembly to expand and deform, resulting in the expansion of the battery cell itself.

[0076] However, when a battery cell malfunctions (such as abnormal charging / discharging or abnormal temperature), the expansion force of the battery cell increases, causing the degree of expansion to exceed the normal expansion force threshold. This poses a risk of damage to the battery cell and a risk of the battery device causing harm to personnel or electrical equipment, thus affecting the reliability of the battery device.

[0077] Based on the above considerations, in order to solve the problem of the reliability of the battery device being affected by abnormal expansion of individual battery cells, this application provides a battery device including a housing, a battery cell assembly, and a first sensor. The battery cell assembly is disposed within the housing and includes at least one battery cell. Each battery cell includes a casing, and the casing includes a first wall. The surface of the battery cell perpendicular to the thickness direction of the first wall is the surface with the largest area of ​​the battery cell. The first sensor is disposed on the outer surface of the first wall and is used to detect the expansion force of the battery cell.

[0078] By installing a first sensor on the first wall of the battery cell, the sensor can detect changes in the expansion force of the battery cell in real time. When the expansion force of the battery cell exceeds the normal threshold, the abnormal situation of the battery cell can be reported in real time, so that intervention measures can be taken in advance to reduce the risk of damage to the battery device, thereby improving the reliability of the battery device. At the same time, the surface of the battery cell perpendicular to the thickness direction of the first wall is the largest surface of the battery cell, that is, the first wall is the large surface of the battery cell. The large surface of the battery cell has a large degree of expansion. Installing the first sensor on the first wall can enable the first sensor to detect the expansion force of the battery cell more accurately, which helps to improve the accuracy of the first sensor in detecting the expansion force.

[0079] The technical solutions described in the embodiments of this application are applicable to various power devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0080] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0081] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 100 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 1 is installed inside the vehicle 100, and the battery device 1 can be located at the bottom, front, or rear of the vehicle 100. The battery device 1 can be used to power the vehicle 100; for example, the battery device 1 can serve as the operating power source for the vehicle 100's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 100.

[0082] The vehicle 100 may also include a controller 110 and a motor 120. The controller 110 is used to control the battery device 1 to supply power to the motor 120, for example, for the power needs of the vehicle 100 during startup, navigation and driving.

[0083] In some embodiments of this application, the battery device 1 can not only serve as the operating power source of the vehicle 100, but also as the driving power source of the vehicle 100, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100.

[0084] Please refer to Figure 2 , Figure 2This is an exploded view of the structure of a battery device provided in some embodiments of this application. The battery device 1 includes a housing 10 and a battery cell assembly 20, the battery cell assembly 20 being housed within the housing 10. The housing 10 provides a accommodating space for the battery cell assembly 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, the first sub-housing 11 and the second sub-housing 12 overlapping each other, the first sub-housing 11 and the second sub-housing 12 jointly defining a accommodating space for accommodating the battery cell assembly 20. The first sub-housing 11 may be a hollow structure with one open end, and the second sub-housing 12 may be a plate-like structure, the second sub-housing 12 covering the open side of the first sub-housing 11, so that the first sub-housing 11 and the second sub-housing 12 jointly define the accommodating space; the first sub-housing 11 and the second sub-housing 12 may also both be hollow structures with one open side, the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0085] In the battery device 1, there can be multiple battery cell modules 20. These multiple battery cell modules 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cell modules 20 are connected in both series and parallel configurations. Multiple battery cell modules 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cell modules 20 is housed within the housing 10. Alternatively, the battery device 1 can also consist of multiple battery cell modules 20 first connected in series, parallel, or in a mixed configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 10. The battery device 1 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cell modules 20.

[0086] The battery cell assembly 20 may include multiple battery cells 21, which may be secondary batteries or primary batteries; the battery cells 21 may also be lithium-sulfur batteries, sodium-ion batteries or magnesium-ion batteries, but are not limited to these.

[0087] Please refer to Figure 3 , Figure 3This is an exploded view of the structure of a battery cell provided in some embodiments of this application. The battery cell 21 includes one or more electrode assemblies 213 and a housing 211. The housing 211 may include a shell 2116 and an end cap 2114. Multiple walls of the shell 2116 form a cavity that can accommodate the electrode assemblies 213. The shape of the shell 2116 depends on the combined shape of the one or more electrode assemblies 213. For example, the shell 2116 may be a hollow cuboid, cube, or regular polyhedron, and one face of the shell 2116 has an opening so that one or more electrode assemblies 213 can be placed inside the shell 2116. The end cap 2114 closes the opening to isolate the internal environment of the battery cell 21 from the external environment. The shell 2116 is filled with an electrolyte, such as an electrolyte solution.

[0088] The housing 2116 is a component used to cooperate with the end cap 2114 to form the internal environment of the battery cell 21, wherein the formed internal environment can accommodate the electrode assembly 213, electrolyte, and other components. The housing 2116 and the end cap 2114 can be independent components. The housing 2116 can be of various shapes and sizes. Specifically, the shape of the housing 2116 can be determined according to the specific shape and size of the electrode assembly 213. The housing 2116 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0089] End cap 2114 refers to a component that covers the opening of housing 2116 to isolate the internal environment of battery cell 21 from the external environment. The shape of end cap 2114 can be adapted to the shape of housing 2116 to fit it. Optionally, end cap 2114 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 2114 is not easily deformed under pressure and impact, giving battery cell 21 higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on end cap 2114. Electrode terminals can be used for electrical connection with electrode assembly 213 to output or input electrical energy to battery cell 21. The material of end cap 2114 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may also be provided on the inner side of the end cap 2114. The insulating structure can be used to isolate the electrical connection components within the housing 2116 from the end cap 2114 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0090] The battery cell 21 may also include two electrode terminals 212, which can be disposed on an end cap 2114. The end cap 2114 is typically flat, and the two electrode terminals 212 are fixed to the flat surface of the end cap 2114, which are respectively a positive electrode terminal and a negative electrode terminal. In this battery cell 21, depending on actual usage requirements, the electrode assembly 213 may be single or multiple, and multiple independent electrode assemblies 213 may be disposed within the battery cell 21.

[0091] Please refer to Figure 3 and refer to Figures 4 to 6 , Figure 4 This is a connection diagram of the first connector provided in some embodiments of this application. Figure 5 This is a connection diagram of the first connector provided in other embodiments of this application. Figure 6 This is a connection diagram of the first connector provided in some embodiments of this application. Specifically, for the purpose of illustrating the first sensor, Figure 4 , Figure 5 and Figure 6 Each component conceals a portion of the battery cell. This application provides a battery device 1, which includes a housing 10, a battery cell assembly 20, and a first sensor 30. The battery cell assembly 20 is disposed within the housing 10 and includes at least one battery cell 21. The battery cell 21 includes a housing 211, and the housing 211 includes a first wall 2111. The surface of the battery cell 21 perpendicular to the thickness direction X of the first wall is the surface with the largest area of ​​the battery cell 21. The first sensor 30 is disposed on the outer surface of the first wall 2111 and is used to detect the expansion force of the battery cell 21.

[0092] In some embodiments, the battery cell assembly 20 may include a battery cell 21.

[0093] In some embodiments, the battery cell assembly 20 may include two or more battery cells 21.

[0094] In some embodiments, the thickness direction of the first wall can be represented by the direction indicated by the letter X in the figure.

[0095] In some embodiments, the thickness direction X of the first wall can be the width direction of the battery cell 21.

[0096] In some embodiments, the thickness direction X of the first wall can be the length direction of the battery device 1.

[0097] In some embodiments, the surface of the battery cell 21 perpendicular to the thickness direction X of the first wall can be the inner or outer surface of the first wall 2111, which is the surface with the largest area of ​​the battery cell 21, that is, the first wall 2111 can be the large surface of the battery cell 21.

[0098] In some embodiments, the first sensor 30 may be a pressure sensor, a displacement sensor, or a resistance strain gauge, etc.

[0099] In some embodiments, taking the first sensor 30 as a resistance strain gauge as an example, the first sensor 30 can be disposed on the outer surface of the first wall 2111. When the battery cell 21 expands, it causes the first wall 2111 to deform. The first sensor 30 converts the strain generated by the deformation of the first wall 2111 into a change in resistance, thereby detecting the deformation of the first wall 2111 and thus detecting whether the expansion force of the battery cell 21 that causes the deformation of the first wall 2111 exceeds the normal threshold.

[0100] In some embodiments, the battery cell 21 includes a housing 211 and an electrode assembly 213, the electrode assembly 213 being housed within the housing 211. In the thickness direction X of the first wall, the first wall 2111 may have an inner surface and an outer surface. The outer surface of the first wall 2111 may be the surface of the first wall 2111 facing away from the electrode assembly 213, and the inner surface of the first wall 2111 may be the surface of the first wall 2111 facing the electrode assembly 213.

[0101] In some embodiments, the first wall 2111 can be the sidewall 2115 with the largest area of ​​the battery cell 21.

[0102] In some embodiments, the first sensor 30 may be signal-connected to the battery management system 50, or the first sensor 30 may be signal-connected to the control system of the power-consuming device. When the first sensor 30 detects the expansion force of the battery cell 21, it transmits the detected information to the battery management system 50 or the control system of the power-consuming device. The battery management system 50 or the control system of the power-consuming device determines whether the expansion force of the battery cell 21 exceeds a normal threshold. If it exceeds the threshold, the battery management system 50 or the control system of the power-consuming device can remind the operator to intervene in the battery device 1 through a warning message.

[0103] The technical solution of this application embodiment involves setting a first sensor 30 on the first wall 2111 of the battery cell 21. The first sensor 30 detects the change in expansion force of the battery cell 21 in real time. When the expansion force of the battery cell 21 exceeds the normal threshold, it can provide real-time feedback on the abnormal situation of the battery cell 21, so as to take early intervention measures for the battery device 1, reduce the risk of damage to the battery device 1, and thus improve the reliability of the battery device 1. At the same time, the surface of the battery cell 21 perpendicular to the thickness direction X of the first wall is the surface with the largest area of ​​the battery cell 21, that is, the first wall 2111 is the large surface of the battery cell 21. The large surface of the battery cell 21 has a large degree of expansion. Setting the first sensor 30 on the first wall 2111 enables the first sensor 30 to detect the expansion force of the battery cell 21 more accurately, which helps to improve the accuracy of the first sensor 30 in detecting the expansion force.

[0104] Please refer to Figures 3 to 6 In some embodiments, the battery device 1 includes a first connector 40 and a battery management system 50. The first connector 40 connects a first sensor 30 and the battery management system 50 to transmit the detection information of the first sensor 30 to the battery management system 50.

[0105] In some embodiments, the battery management system 50 (BMS) can manage and maintain each individual battery cell 20, monitor the status of the battery device 1, and reduce the risk of overcharging and over-discharging of the battery device 1, thereby extending the service life of the battery device 1.

[0106] The battery management system 50 is connected to the wireless communication module and the display module through a communication interface. The output of the acquisition module is connected to the input of the battery management system 50. The output of the battery management system 50 is connected to the input of the control module. The control module is connected to the battery cell assembly 20 and the electrical equipment. The battery management system 50 is connected to the server through the wireless communication module, thereby realizing the dynamic monitoring of the battery device 1 during the charging and discharging process by the battery management system 50.

[0107] In some embodiments, the first connector 40 may be connected to the signal output terminal of the first sensor 30 and to the receiving terminal of the battery management system 50 to transmit the detection information of the first sensor 30 to the battery management system 50.

[0108] In some embodiments, the first sensor 30 detects the expansion force of the battery cell 21. The detection information from the first sensor 30 is transmitted to the battery management system 50 via the first connector 40. The battery management system 50 determines whether the expansion force exceeds a threshold. When the expansion force of the battery cell 21 exceeds the normal threshold, the battery management system 50 sends the determination result to the display terminal of the electrical device. Taking a vehicle as an example, the battery management system 50 feeds back the situation that the expansion force of the battery cell 21 exceeds the threshold to the vehicle's dashboard, reminding the user to intervene in the battery device 1.

[0109] The technical solution of this application embodiment connects the first sensor 30 and the battery management system 50 through the first connector 40, and transmits the detection information of the first sensor 30 to the battery management system 50, so that the battery management system 50 can process and feed back the detection information of the first sensor 30, so as to take intervention measures for the battery device 1 in advance, reduce the risk of damage to the battery device 1, and thus improve the reliability of the battery device 1.

[0110] Please refer to Figures 3 to 6 and refer to Figure 7 , Figure 7 This is a schematic diagram of the connection between the first connector and the first sensor from another perspective, provided for some embodiments of this application. In some embodiments, the battery cell 21 further includes an electrode terminal 212, the housing 211 includes a second wall 2112, the electrode terminal 212 is disposed on the second wall 2112, and at least a portion of the first connector 40 is disposed between the outer surface of the second wall 2112 and the inner surface of the housing 10 in the thickness direction Y of the second wall.

[0111] In some embodiments, the battery management system 50 may be located inside the housing 10 and disposed on one side of the housing 10 in the thickness direction X of the first wall, or disposed on one side of the housing 10 in the thickness direction Y of the second wall. The first sensor 30 may be at a certain distance from the battery management system 50 in the thickness direction X of the first wall, and the first sensor 30 and the battery management system 50 need to be connected by the first connector 40.

[0112] In some embodiments, the battery cell 21 may include an electrode assembly 213, an electrode terminal 212 may be connected to the electrode assembly 213, the battery device 1 may be provided with a connector, the connector may be connected to an external power device or an external power source, and the electrode terminal 212 may be electrically connected to the connector to realize the charging and discharging of the battery cell 21.

[0113] In some embodiments, electrode terminals 212 may be disposed on a second wall 2112, which may be an end cap 2114 of a battery cell 21.

[0114] In some embodiments, the thickness direction of the second wall can be represented by the direction indicated by the letter Y in the figure.

[0115] In some embodiments, the thickness direction Y of the second wall can be the height direction of the battery cell 21.

[0116] In some embodiments, the thickness direction Y of the second wall can be the height direction of the battery device 1.

[0117] In some embodiments, in the thickness direction Y of the second wall, the second wall 2112 may have an inner surface and an outer surface. The outer surface of the second wall 2112 may be the surface of the second wall 2112 facing away from the electrode assembly 213, and the inner surface of the second wall 2112 may be the surface of the second wall 2112 facing the electrode assembly 213.

[0118] In some embodiments, the housing 10 may have an inner surface and an outer surface, and the housing 10 may have a receiving cavity in which the battery cell assembly 20 may be received. The inner surface of the housing 10 may be the surface of the housing 10 that forms the receiving cavity, and the outer surface of the housing 10 may be the surface of the housing 10 that faces away from the receiving cavity.

[0119] It should be noted that the inner surface of the housing 10 forms a receiving cavity, that is, the housing 10 has different inner surfaces in the thickness direction X of the first wall and in the thickness direction Y of the second wall.

[0120] In some embodiments, in the thickness direction Y of the second wall, a portion of the first connector 40 may be located between the outer surface of the second wall 2112 and the inner surface of the housing 10. In the thickness direction X of the first wall, another portion of the first connector 40 may be located between the outer surface of the first wall 2111 and the inner surface of the housing 10, and the other portion of the first connector 40 is connected to the output terminal of the first sensor 30.

[0121] In some embodiments, along the thickness direction Y of the second wall, the first connector 40 is entirely located between the outer surface of the second wall 2112 and the inner surface of the housing 10. The output end of the first sensor 30 may have a certain length, and along the thickness direction X of the first wall, a portion of the output end of the first sensor 30 may be located between the inner surface of the housing 10 and the outer surface of the first wall 2111. Along the thickness direction Y of the second wall, another portion of the output end of the first sensor 30 may be located between the inner surface of the housing 10 and the outer surface of the second wall 2112, and this other portion of the output end of the first sensor 30 is connected to the first connector 40.

[0122] In some embodiments, the electrode terminal 212 may have a certain size in the thickness direction Y of the second wall, and the first connector 40 is disposed on the second wall 2112. The end of the first connector 40 away from the second wall 2112 does not exceed the end of the electrode terminal 212 away from the second wall 2112, so that the first connector 40 and the electrode terminal 212 can share the space in the thickness direction Y of the second wall, without the need to reserve other space for accommodating the first connector 40, saving space and improving the energy density of the battery device 1.

[0123] In some embodiments, the battery device 1 may include a current-combining component for inputting and outputting current. The current-combining component is connected to the electrode terminal 212, that is, in the thickness direction Y of the second wall. The current-combining component is located between the outer surface of the second wall 2112 and the inner surface of the housing 10, so that the first connector 40 and the current-combining component can share the space in the thickness direction Y of the second wall. There is no need to reserve other space for accommodating the first connector 40, which saves space and helps to improve the energy density of the battery device 1.

[0124] In some embodiments, the battery device 1 may include a low-voltage harness for voltage sampling. The low-voltage harness is connected to the electrode terminal 212, that is, in the thickness direction Y of the second wall. The low-voltage harness is located between the outer surface of the second wall 2112 and the inner surface of the housing 10, so that the first connector 40 and the low-voltage harness can share the space in the thickness direction Y of the second wall. There is no need to reserve other space for accommodating the first connector 40, which saves space and helps to improve the energy density of the battery device 1.

[0125] In the technical solution of this application embodiment, the electrode terminal 212 has a certain size in the thickness direction Y of the second wall. At least a portion of the first connector 40 is disposed between the outer surface of the second wall 2112 and the inner surface of the housing 10, so that at least a portion of the first connector 40 shares space with the electrode terminal 212 in the thickness direction Y of the second wall. This makes the spatial arrangement of the first connector 40 more reasonable, which is conducive to improving the space utilization of the battery device 1, thereby improving the energy density of the battery device 1.

[0126] Please refer to Figures 3 to 7 In some embodiments, the battery device 1 includes an adhesive 60 that connects the first connector 40 and the second wall 2112.

[0127] In some embodiments, the adhesive 60 may be a structural adhesive having good adhesion properties.

[0128] In some embodiments, the first connector 40 may be bonded to the outer surface of the second wall 2112.

[0129] In some embodiments, the first connector 40 can also be fixed to the second wall 2112 by means of a snap-fit ​​connection.

[0130] In some embodiments, the battery device 1 may further include an insulating plate connected to the second wall 2112, and the first connector 40 is adhered to or snapped onto the insulating plate.

[0131] The technical solution of this application embodiment connects the first connector 40 and the second wall 2112 through the adhesive 60, which helps to improve the convenience of fixing the first connector 40, and at the same time reduces the risk of the first connector 40 moving in the housing 10 and interfering with other components in the housing 10, thus improving the reliability of the battery device 1.

[0132] Please refer to Figures 3 to 6 In some embodiments, there are multiple battery cells 21, which are arranged along the thickness direction X of the first wall. There are multiple first sensors 30, which are all connected to the first connector 40. Each first sensor 30 is disposed on a battery cell 21, and the number of first sensors 30 is less than or equal to the number of battery cells 21.

[0133] In some embodiments, the number of battery cells 21 can be multiple, such as two, three, four, etc.

[0134] In some embodiments, a plurality of battery cells 21 may be arranged along the thickness direction X of the first wall. The number of first walls 2111 of a battery cell 21 may be two, and the two first walls 2111 are spaced apart along the thickness direction X of the first wall. The two first walls 2111 of a battery cell 21 may be respectively arranged opposite to the first walls 2111 of two adjacent battery cells 21. The opposite arrangement may be in direct contact, adhesive, or separated by an insulating material (such as rubber).

[0135] It should be noted that, in the thickness direction X of the first wall, one of the first walls 2111 of the outermost battery cell 21 is disposed opposite to the first wall 2111 of the adjacent battery cell 21, and the other first wall 2111 is disposed opposite to the inner surface of the housing 10.

[0136] In some embodiments, the number of first sensors 30 can be multiple, such as two, three, four, etc.

[0137] In some embodiments, the number of first sensors 30 can be equal to the number of battery cells 21, with one first sensor 30 provided for each battery cell 21, so that multiple sensors can detect the expansion force of each battery cell 21 respectively.

[0138] In some embodiments, the number of first sensors 30 may be less than the number of battery cells 21. For example, one sensor may be disposed on the first wall 2111 of a battery cell 21 and located between two adjacent battery cells 21.

[0139] Multiple battery cells 21 are directly or indirectly connected to each other. The expansion force of the battery cell 21 can be transmitted to other battery cells 21 along the thickness direction X of the first wall. Thus, the expansion force of the battery cell 21 without the first sensor 30 can also be detected by the first sensor 30 provided on other battery cells 21.

[0140] The technical solution of this application embodiment, by setting multiple first sensors 30, improves the accuracy and real-time performance of the first sensors 30 in detecting the expansion force of the battery cell 21, thereby improving the reliability of the battery device 1. At the same time, the number of first sensors 30 is less than the number of battery cells 21, resulting in a smaller number of first sensors 30 and thus reducing costs.

[0141] Please refer to Figures 3 to 6 In some embodiments, there are multiple battery cells 21, which are arranged along the thickness direction X of the first wall. There is one first sensor 30, which is disposed in the battery cell 21 located in the middle region of the multiple battery cells 21 along the thickness direction X of the first wall.

[0142] When one or more of the battery cells 21 expand, the expansion force can be transmitted from the expanded battery cell 21 to the other battery cells 21 along the thickness direction X of the first wall. In some embodiments, the number of first sensors 30 can be one, and the first sensor 30 is disposed in the battery cell 21 in the middle region of the plurality of battery cells 21, such that the distance between the battery cells 21 on both sides and the battery cell 21 in the middle region is smaller along the thickness direction X of the first wall, that is, the distance between the battery cells 21 on both sides and the first sensor 30 is smaller, so that the expansion force of the battery cells 21 on both sides can be better detected by the first sensor 30.

[0143] In some embodiments, the plurality of battery cells 21 may include a first battery cell, a second battery cell, and at least one third battery cell. The first battery cell and the second battery cell are spaced apart along the thickness direction X of the first wall, and at least one third battery cell is located between the first battery cell and the second battery cell. The third battery cell is a battery cell in the middle region.

[0144] There can be multiple first battery cells and multiple second battery cells. Multiple first battery cells are arranged along the thickness direction X of the first wall, and multiple second battery cells are arranged along the thickness direction X of the first wall. The number of first battery cells and the number of second battery cells can be the same.

[0145] The technical solution of this application embodiment reduces the number of first sensors 30 by setting a single first sensor 30 to detect the expansion force of the battery cell 21, thus lowering costs. Furthermore, placing the first sensor 30 in the battery cell 21 located in the middle region among the multiple battery cells 21 improves the accuracy and real-time performance of the first sensor 30 in detecting the expansion force of battery cells 21 in other regions, thereby enhancing the reliability of the battery device 1.

[0146] Please refer to Figure 3 and Figure 4 In some embodiments, the battery device 1 further includes a second sensor 70 disposed inside the housing 10. The second sensor 70 is used to detect the temperature or voltage of the battery cell 21. The first connector 40 connects the second sensor 70 and the battery management system 50 to transmit the detection information of the second sensor 70 to the battery management system 50.

[0147] In some embodiments, the second sensor 70 may be a voltage sensor. The second sensor 70 may be electrically connected to the electrode terminal 212 or the busbar component, and the output terminal of the second sensor 70 may be connected to the first connector 40. The voltage information detected by the second sensor 70 may be transmitted to the battery management system 50 through the first connector 40.

[0148] In some embodiments, the second sensor 70 may be a temperature sensor. The second sensor 70 may be disposed on the first wall 2111, the second wall 2112 or other wall of the housing 211 of the battery cell 21, and the output terminal of the second sensor 70 is connected to the first connector 40. The temperature information detected by the second sensor 70 is transmitted to the battery management system 50 through the first connector 40.

[0149] In some embodiments, the first sensor 30 and the second sensor 70 may both be connected to the first connector 40, that is, the first sensor 30 and the second sensor 70 share the first connector 40, and the port for receiving information from the first sensor 30 and the port for receiving information from the second sensor 70 are integrated on the same connector.

[0150] It should be noted that the number of first sensors 30 can be one or more. The number of second sensors 70 can also be one or more. All first sensors 30 and all second sensors 70 can be connected to the same first connector 40. The first connector 40 is connected to an interface of the battery management system 50.

[0151] The technical solution of this application embodiment connects the first sensor 30, which detects the expansion force of the battery cell 21, and the battery management system 50 through the first connector 40. It also connects the second sensor 70, which detects the temperature or voltage of the battery cell 21, and the battery management system 50 through the first connector 40. That is, both the first sensor 30 and the second sensor 70 are connected to the first connector 40, which makes the integration of the first connector 40 better and reduces the number of first connectors 40, which is conducive to improving the space utilization of the battery device 1 and thus improving the energy density of the battery device 1.

[0152] Please refer to Figure 3 and Figure 5 In some embodiments, the battery device 1 further includes a second sensor 70 and a second connector 80. The second sensor 70 is disposed inside the housing 10 and is used to detect the temperature or voltage of the battery cell 21. The second connector 80 connects the second sensor 70 and the battery management system 50 to transmit the detection information of the second sensor 70 to the battery management system 50.

[0153] It should be noted that the function and configuration of the second sensor 70 here can be the same as those of the second sensor 70 in the above embodiments.

[0154] In some embodiments, the structure of the first connector 40 and the structure of the second connector 80 may be the same or different.

[0155] In some embodiments, the first sensor 30 may be connected to the first connector 40, and the second sensor 70 may be connected to the second connector 80. That is, the first sensor 30 and the second sensor 70 are connected to different connectors, so that when the first sensor 30 or the first connector 40 is maintained or repaired, the impact on the second sensor 70 and the second connector 80 is minimized, and at the same time, when the second sensor 70 or the second connector 80 is maintained or repaired, the impact on the first sensor 30 and the first connector 40 is minimized.

[0156] It should be noted that the number of first sensors 30 can be one or more. The number of second sensors 70 can also be one or more. All first sensors 30 can be connected to the same first connector 40, and all second sensors 70 can be connected to the same second connector 80. The first connector 40 and the second connector 80 are connected to different interfaces of the battery management system 50.

[0157] The technical solution of this application embodiment connects the first sensor 30 that detects the expansion force of the battery cell 21 and the battery management system 50 through the first connector 40, and connects the second sensor 70 that detects the temperature or voltage of the battery cell 21 and the battery management system 50 through the second connector 80. This reduces the risk of mutual interference between the information transmission of the first sensor 30 and the information transmission of the second sensor 70, and facilitates the maintenance and repair of the information transmission of the first sensor 30 and the information transmission of the second sensor 70 by the battery device 1.

[0158] Please refer to Figure 3 and Figure 6 In some embodiments, there are multiple first sensors 30 and multiple first connectors 40. Each first connector 40 is connected to a battery management system 50 and a first sensor 30 respectively, so as to transmit the detection information of the first sensor 30 to the battery management system 50.

[0159] In some embodiments, the number of first sensors 30 and the number of first connectors 40 can both be multiple, and the number of first sensors 30 can be the same as the number of first connectors 40.

[0160] Taking an example where both the number of first sensors 30 and the number of first connectors 40 are two, one first connector 40 connects the battery management system 50 to one first sensor 30, and the other first connector 40 connects the battery management system 50 to another first sensor 30. Therefore, maintenance or repair of one first sensor 30 or one first connector 40 has minimal impact on the other first sensor 30 and the other first connector 40. Similarly, maintenance or repair of the other first sensor 30 or the other first connector 40 has minimal impact on the first first sensor 30 and the first connector 40.

[0161] It should be noted that the two first connectors 40 are connected to different interfaces of the battery management system 50.

[0162] In some embodiments, there may be multiple first sensors 30. Some of the first sensors 30 may be connected to the same first connector 40, while another portion of the first sensors 30 may be connected to a second sensor 70 in another first connector 40. Furthermore, each of the first sensors 30 may be connected to a first connector 40.

[0163] In the technical solution of this application embodiment, each first connector 40 is connected to a battery management system 50 and a first sensor 30, which reduces the risk of mutual interference between the information transmission of each first sensor 30 and facilitates the maintenance and repair of the information transmission of each first sensor 30 by the battery device 1.

[0164] Please refer to Figures 3 to 6 and refer to Figure 8 , Figure 8 This is an exploded view of the structure connecting the first connector and the first sensor according to some embodiments of this application. In some embodiments, the output end of the first sensor 30 is provided with a first quick-connect terminal 31, and the first connector 40 has a second quick-connect terminal 41 that matches the first quick-connect terminal 31. The first quick-connect terminal 31 and the second quick-connect terminal 41 are connected to each other to connect the first sensor 30 and the first connector 40.

[0165] In some embodiments, the output terminal of the first sensor 30 can be a wire, one end of which is connected to the body of the first sensor 30, the body of the first sensor 30 detecting the expansion force of the battery cell 21, and the other end of the wire can be provided with a first quick-connect terminal 31.

[0166] The first connector 40 has a second quick-connect terminal 41, which can be directly integrated into the body of the first connector 40 or connected to the wire of the first connector 40. The wire of the first connector 40 is connected to the body of the first connector 40.

[0167] The first sensor 30 and the first connector 40 are connected by connecting the first quick-connect terminal 31 and the second quick-connect terminal 41.

[0168] The first quick-connect terminal 31 and the second quick-connect terminal 41 can be made of plastic and have good insulation properties. The first quick-connect terminal 31 and the second quick-connect terminal 41 can be connected by a snap-fit ​​mechanism.

[0169] The technical solution of this application embodiment has a simple and quick installation of quick-connect terminals, high reliability, and convenient maintenance. The connection between the first connector 40 and the first sensor 30 is realized through the first quick-connect terminal 31 and the second quick-connect terminal 41, which helps to improve the convenience of connection and maintenance between the first sensor 30 and the first connector 40, and also helps to improve the reliability of the connection between the first sensor 30 and the first connector 40.

[0170] In some embodiments, the output terminal of the first sensor 30 is welded to the first connector 40 to connect the first sensor 30 and the first connector 40.

[0171] In some embodiments, the output end of the first sensor 30 can be welded to the first connector 40 by through-hole reflow soldering, dip soldering, or selective soldering (specific areas contacting the solder wave), etc.

[0172] The technical solution of this application embodiment has a high temperature reliability in welding effect, low welding cost, and strong high temperature resistance at the joint after welding. By welding the output end of the first sensor 30 to the first connector 40, it is beneficial to improve the reliability of the connection between the first sensor 30 and the first connector 40 and to save costs.

[0173] In some embodiments, the first connector 40 is a circuit board; or, the first connector 40 is a wire.

[0174] In some embodiments, when both the first sensor 30 and the second sensor 70 are connected to the first connector 40, the first connector 40 may be a circuit board.

[0175] In some embodiments, when multiple first sensors 30 are connected to a first connector 40, the first connector 40 may be a circuit board.

[0176] In some embodiments, when multiple second sensors 70 are connected to a second connector 80, the second connector 80 may be a circuit board.

[0177] In some embodiments, when a first sensor 30 is connected to a first connector 40, the first connector 40 may be a wire.

[0178] It should be noted that the specific configuration of the first connector 40 is not limited to the above-mentioned situation.

[0179] It should be noted that the circuit board mentioned above can be a printed circuit board (PCB) or a flexible circuit board (FPC).

[0180] The wires mentioned above can be wire harnesses or cables.

[0181] In some embodiments, when the first connector 40 is a circuit board, the connection between the first connector 40 and the first sensor 30 can be achieved by a quick-connect connector or by soldering.

[0182] In some embodiments, when the first connector 40 is a wire, the connection between the first connector 40 and the first sensor 30 can be made by a quick-connect connector.

[0183] It should be noted that the specific form of connection between the first connector 40 and the first sensor 30 is not limited to the above-described situation.

[0184] The technical solution of this application embodiment features a lightweight and thin circuit board with good flexibility and adaptability, and high integration density. By setting the first connector 40 as a circuit board, the first connector 40 has better reliability, which is beneficial to improving the energy density of the battery device 1. The wires have good flexibility and durability, and are easy to install. By setting the first connector 40 as a wire, the first connector 40 has better reliability, which is beneficial to improving the ease of installation of the first connector 40.

[0185] Please refer to Figures 3 to 6 In some embodiments, the outer casing 211 includes a bottom wall 2113, an end cap 2114, and a plurality of side walls 2115. The plurality of side walls 2115 surround the outer periphery of the bottom wall 2113, with one end of each side wall 2115 connected to the bottom wall 2113 and the other end forming an opening, which is closed by the end cap 2114. The plurality of side walls 2115 includes a first sub-side wall 2115a disposed opposite to the first wall along the thickness direction X. The surface area of ​​the first sub-side wall 2115a is greater than the surface area of ​​the end cap 2114, the bottom wall 2113, and the surface areas of the other side walls 2115 among the plurality of side walls 2115. The first sub-side wall 2115a is the first wall 2111.

[0186] In some embodiments, the multiple sidewalls 2115 may be integrally formed or welded together.

[0187] In some embodiments, the plurality of sidewalls 2115 may be integrally formed with the bottom wall 2113 or may be welded together.

[0188] In some embodiments, in the thickness direction Y of the second wall, one end of a plurality of sidewalls 2115 may surround the outer periphery of the bottom wall 2113, and the other end of the plurality of sidewalls 2115 may form an opening. An end cap 2114 is connected to the other end of the plurality of sidewalls 2115, and the connection may be by welding, so that the end cap 2114 closes the opening.

[0189] In some embodiments, the sidewall 2115 may include two first sub-sidewalls 2115a and two second sub-sidewalls 2115b. The two first sub-sidewalls 2115a are disposed opposite each other along the thickness direction X of the first wall, and the two second sub-sidewalls 2115b are disposed opposite each other along a first direction Z. The first direction Z may be perpendicular to both the thickness direction X of the first wall and the thickness direction Y of the second wall.

[0190] In some embodiments, the first direction can be represented by the direction indicated by the letter Z.

[0191] A second sub-sidewall 2115b connects to one end of each of the two first sub-sidewalls 2115a at both ends in the thickness direction X of the first wall, and another second sub-sidewall 2115b connects to the other end of each of the two first sub-sidewalls 2115a at both ends in the thickness direction X of the first wall.

[0192] One first sub-sidewall 2115a is connected to one end of two second sub-sidewalls 2115b at both ends in the first direction Z, and the other first sub-sidewall 2115a is connected to the other end of two second sub-sidewalls 2115b at both ends in the first direction Z.

[0193] In some embodiments, the surface area of ​​the first sub-sidewall 2115a is greater than the surface area of ​​the end cap 2114, the surface area of ​​the bottom wall 2113, and the surface area of ​​the second sub-sidewall 2115b, that is, the first sub-sidewall 2115a can be the large surface of the battery cell 21.

[0194] The first sub-sidewall 2115a can be the first wall 2111, and there can be two first sub-sidewalls 2115a. The two first sub-sidewalls 2115a are arranged opposite each other along the thickness direction X of the first wall, and one of the two first sub-sidewalls 2115a can be equipped with a first sensor 30.

[0195] In some embodiments, the battery cell 21 may include an electrode terminal 212 and an electrode assembly 213, the electrode terminal 212 being connected to the electrode assembly 213, and the electrode terminal 212 being disposed on an end cap 2114, that is, the second wall 2112 can be an end cap 2114.

[0196] In the technical solution of this application embodiment, the surface area of ​​the first sub-sidewall 2115a is greater than the surface area of ​​the end cap 2114, the surface area of ​​the bottom wall 2113, and the surface area of ​​the other sidewalls 2115 among the multiple sidewalls 2115. That is, the first sub-sidewall 2115a is the large surface of the battery cell 21. The large surface of the battery cell 21 has a large degree of expansion. By setting the first sensor 30 on the first sub-sidewall 2115a, the first sensor 30 can detect the expansion force of the battery cell 21 more accurately, which is beneficial to improving the accuracy of the first sensor 30 in detecting the expansion force.

[0197] This application also provides an electrical device, including a battery device 1 of any of the above embodiments, the battery device 1 being used to provide electrical energy.

[0198] Please refer to Figure 3 and Figure 4 In some embodiments, the battery device 1 includes a housing 10, a battery cell assembly 20, and a first sensor 30. The battery cell assembly 20 is disposed within the housing 10 and includes a plurality of battery cells 21 arranged along the thickness direction X of the first wall.

[0199] The battery cell 21 includes a housing 211. In the thickness direction X of the first wall, the housing 211 includes a first sub-sidewall 2115a. The surface of the battery cell 21 perpendicular to the thickness direction X of the first wall is the surface with the largest area of ​​the battery cell 21, that is, the first sub-sidewall 2115a is the large surface of the battery cell 21.

[0200] The first sensor 30 is disposed on the outer surface of the first sub-sidewall 2115a and is used to detect the expansion force of the battery cell 21. By disposing the first sensor 30 on the first sub-sidewall 2115a of the battery cell 21, the first sensor 30 can detect the change in the expansion force of the battery cell 21 in real time. When the expansion force of the battery cell 21 exceeds the normal threshold, it can provide real-time feedback on the abnormal condition of the battery cell 21, so as to take early intervention measures for the battery device 1, reduce the risk of damage to the battery device 1, and thus improve the reliability of the battery device 1.

[0201] In some embodiments, the battery device 1 further includes a battery management system 50, a first connector 40, and a second sensor 70. The second sensor 70 is used to detect the voltage or temperature of the battery cell 21. Both the first sensor 30 and the second sensor 70 are connected to the first connector 40, and the first connector 40 is connected to the battery management system 50. The first connector 40 transmits the detection information from the first sensor 30 and the second sensor 70 to the battery management system 50. The first sensor 30 and the second sensor 70 share the first connector 40, integrating the ports for receiving information from the first sensor 30 and the second sensor 70 onto the same connector.

[0202] The first connector 40 connects the first sensor 30, which detects the expansion force of the battery cell 21, and the battery management system 50. It also connects the second sensor 70, which detects the temperature or voltage of the battery cell 21, to the battery management system 50. This design improves the integration of the first connector 40, reducing its number and thus improving the space utilization of the battery device 1, thereby increasing its energy density. Simultaneously, it reduces the number of interfaces for receiving information in the battery management system 50, simplifying its manufacturing process.

[0203] 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: Box; A battery cell assembly is disposed within the housing. The battery cell assembly includes at least one battery cell. The battery cell includes a housing and a first wall. The surface of the battery cell perpendicular to the thickness direction of the first wall is the surface with the largest area of ​​the battery cell. A first sensor is disposed on the outer surface of the first wall, and the first sensor is used to detect the expansion force of the battery cell.

2. The battery device according to claim 1, characterized in that, The battery device includes a first connector and a battery management system. The first connector connects the first sensor and the battery management system to transmit the detection information of the first sensor to the battery management system.

3. The battery device according to claim 2, characterized in that, The battery cell further includes electrode terminals, the housing includes a second wall, the electrode terminals are disposed on the second wall, and at least a portion of the first connector is disposed between the outer surface of the second wall and the inner surface of the housing in the thickness direction of the second wall.

4. The battery device according to claim 3, characterized in that, The battery device includes an adhesive element that connects the first connector and the second wall.

5. The battery device according to claim 2, characterized in that, The number of battery cells is multiple, and the multiple battery cells are arranged along the thickness direction of the first wall. The number of first sensors is multiple, and the multiple first sensors are all connected to the first connector. Each first sensor is disposed in one of the battery cells, and the number of first sensors is less than or equal to the number of battery cells.

6. The battery device according to claim 2, characterized in that, The number of battery cells is multiple, and the multiple battery cells are arranged along the thickness direction of the first wall. The number of first sensors is one, and the first sensor is disposed in the battery cell located in the middle region of the multiple battery cells along the thickness direction of the first wall.

7. The battery device according to any one of claims 2-6, characterized in that, The battery device further includes a second sensor disposed inside the housing. The second sensor is used to detect the temperature or voltage of the battery cell. The first connector connects the second sensor and the battery management system to transmit the detection information of the second sensor to the battery management system.

8. The battery device according to any one of claims 2-6, characterized in that, The battery device further includes a second sensor and a second connector. The second sensor is disposed inside the housing and is used to detect the temperature or voltage of the battery cell. The second connector connects the second sensor and the battery management system to transmit the detection information of the second sensor to the battery management system.

9. The battery device according to any one of claims 2-6, characterized in that, The number of first sensors is multiple, and the number of first connectors is multiple. Each first connector is connected to the battery management system and a first sensor respectively, so as to transmit the detection information of the first sensor to the battery management system.

10. The battery device according to claim 2, characterized in that, The first sensor has a first quick-connect terminal at its output end, and the first connector has a second quick-connect terminal that matches the first quick-connect terminal. The first quick-connect terminal and the second quick-connect terminal are connected to each other to connect the first sensor and the first connector.

11. The battery device according to claim 2, characterized in that, The output terminal of the first sensor is welded to the first connector to connect the first sensor and the first connector.

12. The battery device according to claim 2, characterized in that, The first connector is a circuit board; or, the first connector is a wire.

13. The battery device according to claim 1, characterized in that, The outer casing includes a bottom wall, an end cap, and multiple side walls. The multiple side walls surround the outer perimeter of the bottom wall. One end of each of the multiple side walls is connected to the bottom wall, and the other end forms an opening. The end cap closes the opening. The plurality of sidewalls include a first sub-sidewall disposed opposite to the first wall in the thickness direction, the surface area of ​​the first sub-sidewall being greater than the surface area of ​​the end cap, the surface area of ​​the bottom wall, and the surface area of ​​the other sidewalls among the plurality of sidewalls; The first sub-sidewall is the first wall.

14. An electrical appliance, characterized in that, Includes a battery device as described in any one of claims 1-13, the battery device being used to provide electrical energy.

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