Battery device and electric equipment

Abstract

The utility model relates to a battery device and electric equipment. The battery device comprises a box body with an accommodating cavity; the battery monomer assembly is arranged in the accommodating cavity, and the battery monomer assembly comprises at least one battery monomer; the sensor is used for detecting the expansion force of the battery monomer; a connecting piece and a battery management system, the connecting piece is connected with the sensor and the battery management system so as to transmit detection information of the sensor to the battery management system; and the sampling assembly is used for detecting the electrical parameters of the battery monomers, and the sampling assembly is connected with the battery management system. According to the battery device, the signal transmission stability of the sensor can be improved, the reliability and accuracy of detecting the expansive force of the single battery are improved, and the use stability and reliability of the battery device are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device and an electric equipment. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery device technology is an important factor for their development.

[0003] In the related art, the reliability and accuracy of detecting the expansion force of the battery monomer in the battery device are poor, which affects the use stability and reliability of the battery device. Practical new type content

[0004] The present application aims to solve the problem of poor reliability and accuracy of detecting the expansion force of the battery monomer in the related art, which affects the use stability and reliability of the battery device. To this end, the present application provides a battery device and an electric equipment.

[0005] In a first aspect, the present application provides a battery device, comprising:

[0006] A box body has a containing cavity;

[0007] A battery monomer assembly is arranged in the containing cavity, and the battery monomer assembly comprises at least one battery monomer;

[0008] A sensor is used to detect the expansion force of the battery monomer;

[0009] A connecting piece and a battery management system, the connecting piece connects the sensor and the battery management system, so as to transmit the detection information of the sensor to the battery management system;

[0010] A sampling assembly is used to detect the electrical parameters of the battery monomer, and the sampling assembly is connected to the battery management system.

[0011] According to the battery device of the first aspect of the present application, at least the following beneficial effects are achieved:

[0012] The battery device of the present application is provided by cooperation of the sensor, the connecting piece, the sampling assembly and the battery management system. The sensor and the sampling assembly detect the expansion force and the electrical parameter of the battery cell respectively. The sensor is connected to the battery management system through the connecting piece, and the sampling assembly is directly connected to the battery management system. The signal transmission line of the sensor and the signal transmission line of the sampling assembly are independent of each other. The sensor transmits the expansion force information of the battery cell to the battery management system through the independent connecting piece without the mediation of the sampling assembly. The interference of the sampling assembly is physically isolated. Even if the sampling assembly has a signal interruption, the battery management system can still directly and accurately receive the detection signal of the sensor, and monitor the expansion force of the battery cell in real time. The signal transmission stability of the sensor is improved, and the battery management system can more accurately obtain the expansion force change of the battery cell. The reliability and accuracy of detecting the expansion force of the battery cell are improved, and the use stability and reliability of the battery device are improved.

[0013] In some embodiments, the connecting piece is a wire; and / or, the sampling assembly comprises a sampling piece and a circuit board. The sampling piece is connected to the battery cell to collect the electrical parameter of the battery cell. The circuit board is connected to the sampling piece and the battery management system to transmit the collected information of the sampling piece to the battery management system.

[0014] In this way, the sensor is directly connected to the battery management system through the wire, and the sampling piece is connected to the battery management system through the circuit board. The detection signal of the sensor is directly sent to the battery management system through the independent wire, and the interference of the sampling piece and / or the circuit board is directly isolated. The accuracy of the battery management system in obtaining the expansion force change of the battery cell is improved. The reliability and accuracy of detecting the expansion force of the battery cell are improved, and the use stability and reliability of the battery device are improved.

[0015] In some embodiments, the battery cell assembly comprises a plurality of battery cells arranged in sequence. The sensor is arranged at the battery cell located at the end of the arrangement direction among the plurality of battery cells.

[0016] In this way, the sensor can normally detect the expansion force of any one of the plurality of battery cells, while reducing the number of sensors arranged. The cost is reduced. Moreover, the battery cell located at the end of the arrangement direction is closer to the battery management system of the battery device in terms of structural characteristics. The length of the connecting wire among the sensor, the connecting piece and the battery management system is shortened. The space utilization of the battery device is improved, thereby improving the energy density of the battery device.

[0017] In some embodiments, a butt joint is formed between the connecting member and the sensor, and the battery device further comprises an insulating package encapsulating the butt joint.

[0018] In this way, the butt joint is isolated from dust, high-temperature gas, moisture and other contaminants by the insulating package, and the butt joint between the connecting member and the sensor is reinforced, improving the sealing performance and structural strength of the butt joint. In this way, the signal transmission stability of the sensor is improved, and the battery management system can more accurately obtain the expansion force change of the battery monomer, thereby improving the use stability and reliability of the battery device.

[0019] In some embodiments, the battery monomer assembly further comprises a limiting member located at the end of the arrangement direction of the plurality of battery monomers, and the butt joint is located at the limiting member, and the insulating package is connected to the limiting member, so that the butt joint is fixed relative to the limiting member.

[0020] In this way, on the one hand, the expansion of the battery monomer is inhibited, and on the other hand, the limiting member is located at the end of the arrangement direction of the plurality of battery monomers, which provides structural support for the insulating package and the butt joint, facilitates the encapsulation and reinforcement of the butt joint by the insulating package, reduces the probability of displacement of the butt joint due to external force impact on the battery device, and at the same time, the limiting member can serve as a support carrier for the connection wires between the connecting member and the sensor, thereby improving the connection reliability between the connecting member and the sensor.

[0021] In some embodiments, the limiting member has opposite bottom and top portions along a direction intersecting the arrangement direction, at least part of the connecting member and the output end of the sensor extend to the top portion and are connected to form the butt joint at the top portion, and the insulating package is connected to the top portion.

[0022] In this way, the connecting member and the output end of the sensor are connected to form the butt joint at the top portion of the limiting member, making full use of the top portion space of the limiting member as a support carrier, reducing the space occupation of the connecting member and the sensor on the battery device, and without the need to extend the connecting member to the space in the arrangement direction of the battery monomer, so that the connecting member does not interfere with the battery monomer, thereby improving the energy density and use reliability of the battery device.

[0023] In some embodiments, the insulating package is stacked with the top portion.

[0024] In this way, the space above the top portion of the limiting member is occupied by the insulating package, further improving the energy density of the battery device.

[0025] In some embodiments, the limiting member is internally provided with a cavity, at least part of the battery management system is arranged in the cavity, and at least part of the connecting member extends into the cavity to be connected with the battery management system.

[0026] In this way, the distance between the battery management system and the connecting member is shortened, the length of the connecting wire between the battery management system and the connecting member is shortened, the space occupied by the battery management system in the accommodating cavity of the box body is reduced, more battery monomers can be arranged in the accommodating cavity, and the energy density of the battery device is improved.

[0027] In some embodiments, the battery device further comprises a connecting terminal, and the connecting member connects the sensor through the connecting terminal.

[0028] In this way, the sensor and the connecting member are connected in a butt joint manner through the connecting terminal, the connection process of the sensor and the connecting member is simplified, the convenience of connection and maintenance of the sensor and the connecting member is provided, and the connection reliability of the sensor and the connecting member is improved.

[0029] In some embodiments, the sensor is arranged on the wall surface with the largest area of the battery monomer.

[0030] In this way, the sensor can more accurately detect the swelling force of the battery monomer, and the accuracy of the sensor in detecting the swelling force is improved.

[0031] In a second aspect, the application provides a power utilization device, which comprises the battery device described above.

[0032] According to the power utilization device of the second aspect of the application, at least the following beneficial effects are achieved:

[0033] The power utilization device of the application has good operation reliability and use stability due to the configuration of the battery device described above.

[0034] The above description is only a summary of the technical solutions of the application. In order to make the technical solutions of the application more clear, the application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS

[0035] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered as limiting the application. Moreover, the same reference numerals are used to represent the same components throughout the drawings. In the drawings:

[0036] Figure 1A structural schematic diagram of a vehicle of an embodiment of the present application.

[0037] Figure 2 Another structural schematic diagram of a vehicle of an embodiment of the present application.

[0038] Figure 3 A structural exploded view of a battery device of an embodiment of the present application.

[0039] Figure 4 A structural exploded view of a battery cell of an embodiment of the present application.

[0040] Figure 5 A structural schematic diagram of a battery cell assembly of an embodiment of the present application.

[0041] Figure 6 A structural schematic diagram of a battery cell assembly of an embodiment of the present application. Figure 5 A partial enlarged view at A in FIG. 8.

[0042] Figure 7 A partial structural top view of a battery cell assembly of an embodiment of the present application.

[0043] Figure 8 A structural schematic diagram of a matching structure of a connecting piece and a sensor of an embodiment of the present application.

[0044] Figure 9 Another structural schematic diagram of a matching structure of a connecting piece and a sensor of an embodiment of the present application.

[0045] BRIEF DESCRIPTION OF THE DRAWINGS: battery device 10; vehicle 20; controller 30; motor 40; box 100; accommodating cavity 110; first sub-box 101; second sub-box 102; battery cell assembly 200; battery cell 210; shell 211; casing 2111; end cover 2112; electrode assembly 212; electrode terminal 213; limiting piece 220; bottom 221; top 222; cavity 223; sensor 300; output end 310; connecting piece 400; battery management system 500; insulating packaging piece 600; connecting terminal 700; sampling assembly 800; sampling piece 810; circuit board 820; docking portion D; arrangement direction X. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0047] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0048] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0049] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0050] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0051] It is to be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used herein are for the purpose of illustration only and do not indicate the only orientation of the embodiments.

[0052] At present, from the development of market situation, the application of battery device is more and more widely. The battery device is not only applied to the energy storage power system of hydropower, thermal power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery device, the market demand is also increasing.

[0053] The battery device includes one or more battery cell assemblies, and the battery cell assembly includes one or more battery cells. For each battery device, the plurality of battery cell assemblies therein can be in series, parallel or mixed connection. For each battery cell assembly, the plurality of battery cells therein can be in series, parallel or mixed connection. Among them, mixed connection means that there are series and parallel connections in the plurality of battery cells.

[0054] The battery cell is the smallest unit to constitute the battery device, and in the structure of the battery cell, it includes a shell, an electrolyte and an electrode assembly. The electrode assembly is a component that undergoes an electrochemical reaction in the battery cell, and the electrode assembly includes a positive plate, a negative plate and a separator. The shell can include one or more electrode assemblies, and the electrode assembly is mainly formed by winding or stacking the positive plate and the negative plate, and a separator is usually arranged between the positive plate and the negative plate.

[0055] The shell is an open-ended and hollow structure, the electrode assembly is arranged in the shell, and the end cover is arranged at the opening of the shell. The end cover is closed to form the internal environment of the battery cell. Of course, the end cover and the shell can be integrated, specifically, the end cover and the shell can form a common connecting surface before other components enter the shell, and when it is necessary to encapsulate the inside of the shell, the end cover is closed to the shell. The shell can be of various shapes and sizes, such as rectangular, cylindrical, hexagonal, etc. Specifically, the shape of the shell can be determined according to the specific shape and size of the electrode assembly. The material of the shell can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations.

[0056] The development of battery device technology needs to consider various design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate, and other performance parameters. In addition, the reliability of the battery device is also an important factor to consider as environmental conditions and / or internal conditions of the battery change.

[0057] Currently, a battery monomer assembly is accommodated in a box to form a battery device. The battery monomer assembly includes a plurality of battery monomers arranged in the same direction. During charging and discharging, the electrode assembly and the electrolyte undergo an electrochemical reaction, gas is generated inside the battery monomer, and the electrode assembly swells and deforms, thereby causing the battery monomer to swell.

[0058] However, when the battery monomer is abnormal (such as abnormal charging and discharging, abnormal temperature, etc.), the swelling force of the battery monomer increases, causing the swelling degree of the battery monomer to increase, exceeding the normal swelling force threshold, thereby increasing the risk of damage to the battery monomer and the risk of damage to personnel and electrical equipment caused by the battery device, affecting the reliability of the battery device.

[0059] In related technologies, sensors (such as piezoresistive thin film sensors or capacitive force sensors) are widely used in the monitoring of the swelling force of the battery device. Such sensors are usually attached to the surface of the battery monomer or integrated in the battery module. The sampling assembly in the battery device is connected to the sensor and the battery management system (BMS, Battery Management System) of the battery device to transmit the detection information of the sensor to the signal processing module to monitor the swelling force of the battery device in real time.

[0060] However, in the above structure, when the circuit board of the sampling assembly fails (such as short circuit, open circuit) due to vibration, corrosion, overcurrent or other reasons, the transmission signal of the sampling assembly is at risk of interruption, and the battery management system of the battery device is difficult to receive the swelling force data of the battery monomer, making it difficult to accurately monitor the swelling force of the battery monomer, affecting the use stability and reliability of the battery device.

[0061] In other words, in related technologies, the reliability and accuracy of detecting the swelling force of the battery monomer are poor, affecting the use stability and reliability of the battery device.

[0062] Based on this, in order to solve the problem that the reliability and accuracy of the sensor detecting the expansion force of the battery device are poor in the related art, thereby affecting the use stability and reliability of the battery device, one or more embodiments of the present application provide a battery device. Through the cooperation of the sensor, the connecting piece, the sampling assembly and the battery management system, the sensor and the sampling assembly detect the expansion force and the electrical parameter of the battery monomer respectively, the sensor is connected to the battery management system through the connecting piece, and the sampling assembly is directly connected to the battery management system, so that the signal transmission line of the sensor and the signal transmission line of the sampling assembly are independent of each other. The sensor transmits the expansion force information of the battery monomer to the battery management system through the independent connecting piece, without the mediation of the sampling assembly. The interference of the sampling assembly is physically isolated. Even if the sampling assembly has a signal interruption, the battery management system can still directly and accurately receive the detection signal of the sensor, monitor the expansion force of the battery monomer in real time, improve the signal transmission stability of the sensor, and enable the battery management system to more accurately obtain the expansion force change of the battery monomer. In this way, the reliability and accuracy of detecting the expansion force of the battery monomer are improved, and the use stability and reliability of the battery device are improved.

[0063] Referring to Figure 1 and Figure 2 , Figure 1 is a structural schematic diagram of a vehicle of an embodiment of the present application, Figure 2 is another structural schematic diagram of a vehicle of an embodiment of the present application. The vehicle 20 can be a fuel automobile, a gas automobile or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid automobile or a range extended automobile, etc. The vehicle 20 is internally provided with a battery device 10. The battery device 10 can be arranged at the bottom, the head or the tail of the vehicle 20. The battery device 10 can be used for power supply of the vehicle 20, for example, the battery device 10 can be used as an operating power source of the vehicle 20. The vehicle 20 can further include a controller 30 and a motor 40. The controller 30 is used to control the battery device 10 to supply power to the motor 40, for example, to meet the power demand of the vehicle 20 during starting, navigation and driving.

[0064] Of course, in other embodiments, the battery device 10 can not only be used as an operating power source of the vehicle 20, but also be used as a driving power source of the vehicle 20, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 20.

[0065] Referring to Figure 3 , the battery device 10 mentioned in the present application can include a battery pack, etc. The battery monomer assembly 200 can constitute the smallest unit of the battery device 10, and the battery monomer assembly 200 can be a battery module.

[0066] Referring to Figure 3 , Figure 4 , Figure 5 andFigure 6 The battery device 10 includes a box 100, a battery cell assembly 200, a sensor 300, a connecting member 400, a battery management system 500, and a sampling assembly 800.

[0067] The box 100 has a receiving cavity 110. The battery cell assembly 200 is disposed in the receiving cavity 110, and the battery cell assembly 200 includes at least one battery cell 210.

[0068] The sensor 300 is configured to detect an expansion force of the battery cell 210. The connecting member 400 connects the sensor 300 and the battery management system 500, so as to transmit detection information of the sensor 300 to the battery management system 500. An insulating packaging member 600 is configured to package a joint portion D between the connecting member 400 and the sensor 300.

[0069] The sampling assembly 800 is configured to detect an electrical parameter of the battery cell 210, and the sampling assembly 800 is connected to the battery management system 500.

[0070] It should be noted that, referring to Figure 3 and Figure 5 , the box 100 of the battery device 10 refers to a structure for mounting and mechanically supporting the battery cell assembly 200. The battery device 10 can include one or more battery cell assemblies 200 for providing voltage and capacity.

[0071] The box 100 can have various structures. In some embodiments, referring to Figure 3 , the box 100 can include a first sub-box 101 and a second sub-box 102. The first sub-box 101 and the second sub-box 102 are overlapped with each other, and the first sub-box 101 and the second sub-box 102 together define the receiving cavity 110 for accommodating the battery cell assembly 200. The first sub-box 101 can be a hollow structure with one end open, and the second sub-box 102 can be a plate-shaped structure. The second sub-box 102 is overlapped with the open end of the first sub-box 101, so that the first sub-box 101 and the second sub-box 102 together define the receiving cavity 110. Alternatively, the first sub-box 101 and the second sub-box 102 can both be hollow structures with one side open. The open end of the first sub-box 101 is overlapped with the open end of the second sub-box 102.

[0072] In the battery device 10, there can be multiple battery cell modules 200. These multiple battery cell modules 200 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that the multiple battery cell modules 200 are connected in both series and parallel. The multiple battery cell modules 200 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cell modules 200 is housed within the housing 100. Alternatively, the battery device 10 can also consist of multiple battery cell modules 200 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 100. The battery device 10 may also include other structures; for example, the battery device 10 may also include a busbar component for realizing the electrical connection between the multiple battery cell modules 200.

[0073] The battery cell assembly 200 may include multiple battery cells 210, which may be secondary batteries or primary batteries; the battery cells 210 may also be lithium-sulfur batteries, sodium-ion batteries or magnesium-ion batteries, but are not limited to these.

[0074] See Figure 4 , Figure 4 This is an exploded view of the structure of a battery cell according to an embodiment of this application. The battery cell 210 includes a housing 211 and one or more electrode assemblies 212. The housing 211 may include a shell 2111 and an end cap 2112. Multiple walls of the shell 2111 form a cavity that can accommodate the electrode assemblies 212. The shape of the shell 2111 depends on the combined shape of the one or more electrode assemblies 212. For example, the shell 2111 may be a hollow cuboid, cube, or regular polyhedron, and one face of the shell 2111 has an opening so that one or more electrode assemblies 212 can be placed inside the shell 2111. The end cap 2112 closes the opening to isolate the internal environment of the battery cell 210 from the external environment. The shell 2112 is filled with an electrolyte, such as an electrolyte solution.

[0075] The housing 2111 is a component used to cooperate with the end cap 2112 to form the internal environment of the battery cell 210, wherein the formed internal environment can accommodate the electrode assembly 212, electrolyte, and other components. The housing 2111 and the end cap 2112 can be independent components. The housing 2111 can have various shapes and sizes. Specifically, the shape of the housing 2111 can be determined according to the specific shape and size of the electrode assembly 212. The housing 2111 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0076] The end cover 2112 refers to a component that covers the opening of the shell 2111 to isolate the internal environment of the battery cell 210 from the external environment. Without limitation, the shape of the end cover 2112 can be adapted to the shape of the shell 2111 to fit the shell 2111. Optionally, the end cover 2112 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 2112 is not easily deformed when subjected to extrusion collision, so that the battery cell 210 can have higher structural strength, and the reliability can also be improved. The end cover 2112 can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect with the electrode assembly 212 for outputting or inputting the electrical energy of the battery cell 210. The material of the end cover 2112 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application does not make special limitations. In some embodiments, an insulating structure can also be provided on the inner side of the end cover 2112, which can be used to isolate the electrical connection components in the shell 2111 from the end cover 2112 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0077] The battery cell 210 can also include two electrode terminals 213, which can be provided on the end cover 2112. The end cover 2112 is usually flat, and the two electrode terminals 213 are fixed on the flat surface of the end cover 2112, and the two electrode terminals 213 are respectively positive and negative electrode terminals. In the battery cell 210, the electrode assembly 212 can be provided as a single or multiple according to actual use requirements, and the battery cell 210 is provided with multiple independent electrode assemblies 212.

[0078] In the present application, the battery cell assembly 200 can include one battery cell 210, or multiple battery cells 210.

[0079] In the present application, the sensor 300 can be, but is not limited to, a pressure sensor, a displacement sensor, a resistance strain gauge, etc. The sensor 300 is arranged on the wall surface of at least one battery cell 210. The wall surface of the battery cell 210 refers to the wall surface of the shell 2111, and the sensor 300 is arranged on the wall surface of the shell 2111. When the sensor 300 is arranged on the wall surface of the battery cell 210, the expansion force of the battery cell 210 can be obtained. The number of sensors 300 can be one, which is arranged on the wall surface of one battery cell 210 in the middle region of the battery cell assembly 200 or on the wall surface of the battery cell 210 at the end of the battery cell assembly 200. The number of sensors 300 can also be multiple. The battery cell assembly 200 includes multiple battery cells 210 arranged in sequence. Each sensor 300 is arranged on the wall surface of one battery cell 210. All sensors 300 are connected to the connecting member 400, and the number of sensors 300 is less than the number of battery cells 210.

[0080] Generally, during the use of the battery device 10, when the battery cell 210 expands and deforms, the expansion degree of the wall surface with the largest area of the battery cell 210 is greater than that of other wall surfaces of the battery cell 210. Based on this, the sensor 300 can be arranged on the wall surface with the largest area of the battery cell 210, so that the sensor 300 can more accurately detect the expansion force of the battery cell 210. The wall surface with the largest area of the battery cell 210 corresponds to the large surface of the battery cell 210.

[0081] In the present application, taking the sensor 300 as a resistance strain gauge as an example, the sensor 300 can be arranged on the wall surface with the largest area of the battery cell 210. When the battery cell 210 expands and deforms, the wall surface with the largest area of the battery cell 210 deforms, and the sensor 300 converts the strain generated by the deformation of the wall surface with the largest area of the battery cell 210 into resistance change, so as to detect the deformation of the wall surface with the largest area of the battery cell 210, and detect whether the expansion force of the battery cell 210 that deforms the wall surface with the largest area of the battery cell 210 exceeds the normal threshold.

[0082] In the present application, the connecting member 400 can be a wire structure such as a wire harness or a cable, or a circuit board such as a printed circuit board (PCB) or a flexible circuit board (FPC). The connection mode of the connecting member 400 and the sensor 300 can be welding, crimping, twisted connection, etc. The connection mode of the connecting member 400 and the battery management system 500 can be welding connection, crimping connection, twisted connection, etc. between the signal wire harness of the connecting member 400 and the battery management system 500. Of course, in other embodiments, the connecting member 400 can be connected to the sensor 300 and / or the battery management system 500 through a quick plug terminal.

[0083] Alternatively, in other embodiments, the connecting member 400 can be a signal connection wire leading out of the battery management system 500, through which the battery management system 500 is connected to the sensor 300. The connection between the signal connection wire and the sensor 300 can be through a quick connector, or can be connected through welding, crimping, gluing, etc.

[0084] In the present application, the battery management system 500 (English full name Battery Management System, for short BMS) can manage and maintain each battery monomer assembly 200, monitor the state of the battery device 10, reduce the risk of overcharging and overdischarging of the battery device 10, and prolong the service life of the battery device 10. The battery management system 500 is connected to the wireless communication module and the display module through the communication interface, the output end of the sampling module is connected to the input end of the battery management system 500, and the output end of the battery management system 500 is connected to the input end of the control module. The control module is connected to the battery monomer assembly 200 and the electrical equipment, and the battery management system 500 is connected to the server end through the wireless communication module, so as to realize the dynamic monitoring of the battery management system 500 to the battery device 10 in the charging and discharging process.

[0085] In some embodiments, the connecting member 400 can be connected to the signal output end of the sensor 300 and connected to the receiving end of the battery management system 500, so as to transmit the detection signal of the sensor 300 to the battery management system 500.

[0086] It should be understood that the sensor 300 detects the swelling force of the battery monomer 210, and the detection information of the sensor 300 is transmitted to the battery management system 500 through the connecting member 400. The battery management system 500 judges whether the swelling force exceeds the normal threshold value. When the swelling force of the battery monomer 210 exceeds the normal threshold value, the battery management system 500 can transmit the judgment result to the display end of the electrical equipment. Taking the electrical equipment as a vehicle 20 as an example, the battery management system 500 feeds back the condition that the swelling force of the battery monomer 210 exceeds the normal threshold value to the instrument panel of the vehicle 20, and can also be transmitted remotely to the subject responsible for maintenance, so as to intervene in the battery device 10.

[0087] In the present application, the sampling assembly 800 refers to a structure that can directly detect the voltage, temperature and other electrical parameters of the battery monomer 210.

[0088] In some embodiments, the sampling assembly 800 includes a sampling component 810 connected to the battery monomer 210 to collect the electrical parameters of the battery monomer 210, and a circuit board 820 (printed circuit board (PCB) or flexible circuit board (FPC)) connected to the sampling component 810 and the battery management system 500 to transmit the collected information of the sampling component 810 to the battery management system 500.

[0089] Specifically, the sampling component 810 can be a voltage sensor, which can be electrically connected to the electrode terminal 213 or the bus component of the battery monomer 210, and the output end of the sampling component 810 is connected to the circuit board 820, through which the voltage information collected by the sampling component 810 is transmitted to the battery management system 500.

[0090] Alternatively, the sampling component 810 can be a temperature sensor, which is arranged on the wall surface of the battery monomer 210, such as on the large surface or side surface of the battery monomer 210, and the output end of the sampling component 810 is connected to the circuit board 820, through which the temperature information collected by the sampling component 810 is transmitted to the battery management system 500.

[0091] In this application, the sensor 300 and the sampling assembly 800 are two independent structures, the sensor 300 is connected to the battery management system 500 through the connecting component 400, and the sampling assembly 800 is directly connected to the battery management system 500, so that the signal transmission lines of the sensor 300 and the sampling assembly 800 are independent of each other.

[0092] It should be noted that in the battery device 10, the expansion force of the battery monomer 210 is too large, and the surface of the battery monomer 210 expands violently. The violent expansion of the battery monomer 210 is usually the most direct physical precursor of thermal runaway of the battery device 10.

[0093] Therefore, by independently arranging the signal transmission lines of the sensor 300 and the sampling assembly 800, the sensor 300 transmits the expansion force information of the battery monomer 210 to the battery management system 500 through the independent connecting component 400, without the mediation of the sampling assembly 800, which physically isolates the interference of the sampling assembly 800. Even if the sampling assembly 800 has a signal interruption, the battery management system 500 can still directly and accurately receive the detection signal of the sensor 300 through the connecting component 400, and monitor the expansion force of the battery monomer 210 in real time, improve the signal transmission stability of the sensor, make the sensor more accurately detect the expansion force change of the battery monomer, improve the reliability and accuracy of detecting the expansion force of the battery monomer 210, and improve the use stability and reliability of the battery device 10.

[0094] It can be understood from the above description that, by cooperation of the sensor 300, the connecting member 400, the sampling assembly 800 and the battery management system 500, the sensor 300 and the sampling assembly 800 detect the expansion force and the electrical parameter of the battery monomer 210 respectively, the sensor 300 is connected to the battery management system 500 through the connecting member 400, and the sampling assembly 800 is directly connected to the battery management system 500, so that the signal transmission line of the sensor 300 and the signal transmission line of the sampling assembly 800 are independent of each other, the sensor 300 transmits the expansion force information of the battery monomer 210 to the battery management system 500 through the independent connecting member 400 without the mediation of the sampling assembly 800, and the interference of the sampling assembly 800 is physically isolated, even if the sampling assembly 800 has a signal interruption, the battery management system 500 can still directly and accurately receive the detection signal of the sensor 300 through the connecting member 400, and the expansion force of the battery monomer 210 can be monitored in real time, the signal transmission stability of the sensor 300 is improved, the battery management system 500 can more accurately obtain the expansion force change of the battery monomer 210, the reliability and accuracy of detecting the expansion force of the battery monomer 210 are improved, and the use stability and reliability of the battery device 10 are improved.

[0095] In some embodiments of the present application, the connecting member 400 is a wire; and / or, the sampling assembly 800 comprises a sampling member 810 and a circuit board 820, the sampling member 810 is connected to the battery monomer 210 to collect the electrical parameter of the battery monomer 210, and the circuit board 820 is connected to the sampling member 810 and the battery management system 500 to transmit the collected information of the sampling member 810 to the battery management system 500.

[0096] Specifically, the connecting member 400 is a wire structure such as a wire harness or a cable. The output end of the sensor 300 is also a wire such as a wire harness or a cable, one end of the wire is connected to the body of the sensor 300, the other end is connected to the connecting member 400, and when the connecting member 400 and the output end of the sensor 300 are both wires, the connection mode can be welding, crimping, twisting or quick plug connection.

[0097] Each battery monomer 210 is provided with one sensor 300, and all the sensors 300 are connected to the battery management system 500 through the same connecting member 400, or the number of the connecting member 400 is the same as that of the sensor 300, and the sensor 300 is connected to the battery management system 500 through the corresponding connecting member 400.

[0098] Of course, in other embodiments, the number of sensors 300 is less than the number of battery monomers 210, such as one sensor 300 arranged on the wall surface of one battery monomer 210 and located between two adjacent battery monomers 210. The plurality of battery monomers 210 are directly or indirectly connected, so that the swelling force of the battery monomer 210 which is not provided with the sensor 300 can also be detected by the sensor 300 arranged on other battery monomers 210.

[0099] For the sampling assembly 800, the sampling element 810 can be a voltage sensor, the sampling element 810 can be electrically connected to the electrode terminal 213 or the bus component of the battery monomer 210, and the output end of the sampling element 810 is connected to the circuit board 820. The voltage information collected by the sampling element 810 is transmitted to the battery management system 500 through the circuit board 820.

[0100] Alternatively, the sampling element 810 can be a temperature sensor, and the sampling element 810 is arranged on the wall surface of the battery monomer 210, such as the sampling element 810 arranged on the large surface or side surface of the battery monomer 210. The output end of the sampling element 810 is connected to the circuit board 820, and the temperature information collected by the sampling element 810 is transmitted to the battery management system 500 through the circuit board 820.

[0101] Each battery monomer 210 is provided with one or more sampling elements 810, and all the sampling elements 810 are connected to the same circuit board 820. The connecting element 400 and the circuit board 820 are connected to different interfaces of the battery management system 500.

[0102] In the above structure, the sensor 300 is directly connected to the battery management system 500 through the wire, the sampling element 810 is connected to the battery management system 500 through the circuit board 820, and the sensor 300 directly sends the detection signal to the battery management system 500 through the independent wire, which directly isolates the interference of the sampling element 810 and / or the circuit board 820, improves the accuracy of the battery management system 500 to obtain the change of the swelling force of the battery monomer 210, and improves the reliability and accuracy of detecting the swelling force of the battery monomer 210, and improves the use stability and reliability of the battery device 10.

[0103] In addition, the sensor 300 is directly connected to the battery management system 500 through the wire, the wiring requirement is simple, and the structural cost can be reduced.

[0104] In some embodiments of the present application, referring to Figure 5 and Figure 6 The battery monomer assembly 200 includes a plurality of battery monomers 210 arranged in sequence, and the sensor 300 is arranged on the battery monomer 210 located at the end of the arrangement direction X in the plurality of battery monomers 210.

[0105] Specifically, the plurality of battery cells 210 are arranged in sequence along the thickness direction of the battery cells 210, and the arrangement direction X corresponds to the thickness direction of the battery cells 210. The sensor 300 is arranged on the wall surface of the battery cell 210 in the arrangement direction X.

[0106] Among the plurality of battery cells 210, the battery cell 210 located at one end in the arrangement direction X is closer to the battery management system 500 of the battery device 10 than the other battery cells 210, and at this time, the sensor 300 can be one, arranged on the battery cell 210 located at the end in the arrangement direction X closest to the battery management system 500.

[0107] Of course, in other embodiments, among the plurality of battery cells 210, the battery cells 210 located at the opposite two ends in the arrangement direction X are closer to the battery management system 500 of the battery device 10 than the other battery cells 210, and at this time, the sensor 300 can also be two, arranged on the battery cells 210 located at the two ends in the arrangement direction X among the plurality of battery cells 210.

[0108] It should be noted that during use of the battery device 10, when one or several battery cells 210 among the plurality of battery cells 210 swell, the swelling force can be transmitted by the swollen battery cell 210 to other battery cells 210 along the arrangement direction X. When the sensor 300 is arranged on the battery cell 210 located at the end in the arrangement direction X among the plurality of battery cells 210, the sensor 300 detects the swelling force of the battery cell 210 at the end, which can directly reflect the overall swelling force of the battery cell assembly 200, so as to take intervention measures on the battery device 10 in advance.

[0109] The above structure, by arranging the sensor 300 on the battery cell 210 located at the end in the arrangement direction X among the plurality of battery cells 210, can enable the sensor 300 to normally detect the swelling force of any one of the plurality of battery cells 210, while reducing the number of arrangements of the sensor 300, reducing costs, and using the structure characteristic that the battery cell 210 located at the end in the arrangement direction X is closer to the battery management system 500 of the battery device 10, can shorten the connection wire length between the sensor 300, the connecting piece 400 and the battery management system 500, improve the space utilization of the battery device 10, thereby improving the energy density of the battery device 10.

[0110] Further, referring to Figure 5 , Figure 6 , or referring to Figure 7 and Figure 8 , a butt joint D is formed between the connecting piece 400 and the sensor 300, and the battery device 10 further comprises an insulating packaging piece 600, and the insulating packaging piece 600 encapsulates the butt joint D.

[0111] The docking portion D between the connecting piece 400 and the sensor 300 can be understood as: when the connecting piece 400 of the wire structure is welded, crimped or twisted with the output end of the sensor of the wire structure, the docking portion D corresponds to the welding connection, the crimping connection or the twisting connection between the connecting piece 400 and the sensor 300, that is, the docking portion D between the connecting piece 400 and the sensor 300 is the docking connection therebetween.

[0112] When the connecting piece 400 of the wire structure is connected with the output end of the sensor of the wire structure through a quick connector, the docking portion D corresponds to the quick connector.

[0113] The insulating packaging piece 600 refers to an insulating structure for packaging the docking portion D between the connecting piece 400 and the sensor 300. Exemplarily, the insulating packaging piece 600 can be but is not limited to packaging glue, insulating rubber sleeve, insulating heat shrink sleeve and the like.

[0114] The insulating packaging piece 600 is provided, on the one hand, to seal and package the docking portion D between the connecting piece 400 and the sensor 300, to isolate dust, high-temperature gas, moisture and the like outside the docking portion D, and, on the other hand, to reinforce the docking portion D between the connecting piece 400 and the sensor 300, to improve the structural strength of the docking portion D and to reduce the risk of loose connection between the connecting piece 400 and the sensor 300.

[0115] The above structure packages the docking portion D between the connecting piece 400 and the sensor 300 through the insulating packaging piece 600, isolates dust, high-temperature gas, moisture and the like outside the docking portion D by using the insulating packaging piece 600, and reinforces the docking portion D between the connecting piece 400 and the sensor 300, to improve the sealing property and the structural strength of the docking portion D. In this way, the signal transmission stability of the sensor 300 is improved, the battery management system 500 can more accurately obtain the change of the swelling force of the battery monomer 210, and the use stability and reliability of the battery device 10 are improved.

[0116] Further, referring to Figure 5 and Figure 6 , the battery monomer assembly 200 further comprises a limiting piece 220 located at the end of the arrangement direction X of the plurality of battery monomers 210, the docking portion D is located at the limiting piece 220, and the insulating packaging piece 600 connects the limiting piece 220, so that the docking portion D is fixed relative to the limiting piece 220.

[0117] Specifically, the limiting member 220 can have two, respectively, with the two battery monomers 210 at the end of the arrangement direction X, that is, the plurality of battery monomers 210 at the arrangement direction X is clamped and fixed by the limiting member 220 at both ends. The limiting member 220 can be fixed to the inner wall of the box body 100 by bolts, straps and other structures.

[0118] The limiting member 220 can be but not limited to the limiting end plate, the expansion beam, etc. The limiting member 220 can be made of metal or composite material, so that the limiting member 220 has good structural strength. The limiting member 220 is provided to provide rigid support for the plurality of battery monomers 210 in the arrangement direction X, and at the same time, the end of the plurality of battery monomers 210 is provided with structural limiting, which inhibits the expansion of the battery monomer 210, and also reduces the probability of displacement of the battery monomer 210 inside the battery device 10 when the battery device 10 is subjected to vibration and external force impact, which is beneficial to improve the reliability of the battery device 10.

[0119] The docking portion D is located on the limiting member 220, that is, the connecting member 400 and the sensor 300 are connected on the limiting member 220. For example, in some embodiments, the signal output ends of the connecting member 400 and the sensor 300 are both wires, at least part of the connecting member 400 is attached to the wall surface of the limiting member 220, and the signal output end of the sensor 300 is overlapped on the same wall surface of the limiting member 220, and the two are connected on the wall surface of the limiting member 220.

[0120] The connecting member 400 and the sensor 300 are connected on the limiting member 220, that is, the docking portion D is located on the limiting member 220, and the limiting member 220 provides structural support for the insulating packaging member 600, so that the insulating packaging member 600 encapsulates and fixes the docking portion D on the limiting member 220, seals the docking portion D and reinforces the docking portion D.

[0121] The above structure, the limiting member 220 is provided, on the one hand, to inhibit the expansion of the battery monomer 210, and on the other hand, the limiting member 220 is located at the end of the arrangement direction X of the plurality of battery monomers 210, which provides structural support for the insulating packaging member 600 and the docking portion D, facilitates the insulating packaging member 600 to encapsulate and reinforce the docking portion D, reduces the probability of displacement of the docking portion D due to the external force impact of the battery device 10, and at the same time, the limiting member 220 can be used as a support carrier for the connection wire between the connecting member 400 and the sensor 300, so as to improve the connection reliability between the connecting member 400 and the sensor 300.

[0122] Further, referring to Figure 5 , Figure 6 and Figure 7The limiting member 220 has opposite bottom 221 and top 222 in the direction perpendicular to the arrangement direction X, at least part of the connecting member 400 and the output end 310 of the sensor 300 respectively extend to the top 222 and are connected to form a butt joint D at the top 222, and the insulating packaging member 600 is connected to the top 222.

[0123] It should be noted that, Figure 7 Compared with Figure 5 and Figure 6 , the insulating packaging member 600 is hidden, and the butt joint D between the connecting member 400 and the sensor 300 is in an exposed state.

[0124] The limiting member 220 is a limiting end plate or a limiting expansion beam, the bottom 221 and the top 222 of the limiting member 220 correspond to the top surface and the bottom surface of the limiting member 220 respectively, and the connecting direction of the bottom 221 and the top 222 is the height direction of the limiting member 220, which is perpendicular to the arrangement direction X of the plurality of battery monomers 210.

[0125] The connecting member 400 is a first wire, which is drawn out from the battery management system 500 and extends along the top 222 of the limiting member 220 to the middle region of the top 222. The body of the sensor 300 is attached to the wall surface of the battery monomer 210 to directly detect the expansion force of the battery monomer 210, and the output end 310 of the sensor 300 is a second wire, which is drawn out from the body of the sensor 300 and extends along the top 222 of the limiting member 220 to the middle region of the top 222. In this way, the first wire and the second wire extend towards each other along the top 222 of the limiting member 220 to the middle region of the top 222 and form a butt joint to form a butt joint D. The connection of the first wire and the second wire can be welding, crimping, twisting connection, or can be formed by a connecting terminal 700.

[0126] In addition, in the above embodiment, the insulating packaging member 600 can be a packaging glue, which covers the butt joint D between the sensor 300 and the connecting member 400 and is fixed on the top 222 of the limiting member 220. Of course, the insulating packaging member 600 can also be a heat-shrinkable sleeve, which tightly covers the butt joint D by using the heat-shrinkable characteristic of the heat-shrinkable sleeve to realize sealing and reinforcement of the butt joint D.

[0127] It can be understood that, in the above structure, the output end 310 of the connecting member 400 and the sensor 300 is connected to form a butt joint D at the top 222 of the limiting member 220, which fully utilizes the space of the top 222 of the limiting member 220 as a support carrier to reduce the space occupation of the connecting member 400 and the sensor 300 to the battery device 10, and the connecting member 400 does not interfere with the battery monomer 210 without extending to the space of the battery monomer 210 in the arrangement direction X, thereby improving the energy density and use reliability of the battery device 10.

[0128] Further, referring to Figure 5 and Figure 6 , the insulating packaging member 600 is stacked on the top portion 222.

[0129] Specifically, the insulating packaging member 600 is a sheet structure, and the thickness thereof is much smaller than that of the limiting member 220. For example, the insulating packaging member 600 is an insulating tape, which wraps the joint portion D between the sensor 300 and the connecting member 400 and is fixed on the top portion 222 of the limiting member 220. For another example, the insulating packaging member 600 is a heat-shrinkable sleeve, which tightly covers the joint portion D by being shrunk under heat and is attached to the top portion 222 of the limiting member 220. For another example, the insulating packaging member 600 is a packaging glue, which is wrapped around the joint portion D and is attached to the top portion 222 of the limiting member 220 by the plasticity of the packaging glue.

[0130] The above structure encapsulates the joint portion D in the top portion 222 of the limiting member 220, and the insulating packaging member 600 is stacked on the top portion 222, which reduces the space occupied by the insulating packaging member 600 above the top portion 222 of the limiting member 220, and further improves the energy density of the battery device 10.

[0131] In some embodiments of the present application, referring to Figure 5 and Figure 6 , the limiting member 220 is internally provided with a cavity 223, at least part of the battery management system 500 is arranged in the cavity 223, and at least part of the connecting member 400 extends into the cavity 223 to be connected with the battery management system 500.

[0132] Specifically, the limiting member 220 is a plate structure with a certain thickness, and is internally at least partially hollowed out to form the cavity 223. The cell detection circuit and the protector of the battery management system 500 are arranged in the cavity 223. The connecting member 400 extends from the top portion 222 of the limiting member 220 into the cavity 223 to be connected with the cell detection circuit, so that the cell detection circuit can obtain the detection signal of the sensor 300 and transmit the detection signal to the main control unit of the battery management system 500, so as to take corresponding intervention measures on the battery device 10.

[0133] In the above structure, at least part of the functions of the battery management system 500 are integrated in the cavity 223 of the limiting member 220, which shortens the distance between the battery management system 500 and the connecting member 400, thereby shortening the connection wire length between the battery management system 500 and the connecting member 400, and reducing the space occupied by the battery management system 500 in the accommodating cavity 110 of the box body 100, so that more battery monomers 210 can be arranged in the accommodating cavity 110, which is conducive to improving the energy density of the battery device 10.

[0134] In some embodiments of the present application, referring to Figure 9 The battery device 10 further comprises a connecting terminal 700, and the connecting member 400 is connected to the sensor 300 through the connecting terminal 700.

[0135] Specifically, the connecting terminal 700 is a piercing connector.

[0136] Alternatively, the connecting terminal 700 is a quick connector, one end of the connecting member 400 is formed into a male-female plug matching with the connecting terminal 700, and the output end 310 of the sensor 300 is formed into a male-female plug matching with the other end of the connecting terminal 700.

[0137] In the above structure, the sensor 300 and the connecting member 400 are connected through the connecting terminal 700, which simplifies the connecting process of the sensor 300 and the connecting member 400, and also provides convenience for the connection and maintenance of the sensor 300 and the connecting member 400, and is beneficial to improve the connection reliability of the sensor 300 and the connecting member 400.

[0138] In some embodiments of the present application, referring to Figure 5 and Figure 6 The sensor 300 is arranged on the wall surface with the largest area of the battery monomer 210.

[0139] The wall surface with the largest area of the battery monomer 210 is also the large surface of the battery monomer 210.

[0140] Generally, during the use of the battery device 10, when the battery monomer 210 is deformed by swelling, the swelling degree of the wall surface with the largest area of the battery monomer 210 is larger than that of other wall surfaces of the battery monomer 210. Based on this, the sensor 300 can be arranged on the wall surface with the largest area of the battery monomer 210, so that the sensor 300 can more accurately detect the swelling force of the battery monomer 210, which is beneficial to improve the accuracy of the sensor 300 in detecting the swelling force.

[0141] In addition, the present application also provides a power utilization device, which comprises the battery device 10 of any of the above embodiments. The battery device 10 is used to provide electric energy.

[0142] Specifically, referring to Figure 1 and Figure 2The electric device can be a vehicle 20, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, and the like. The spacecraft includes an airplane, a rocket, a space shuttle, a spacecraft, and the like. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric automobile toy, an electric ship toy, an electric airplane toy, and the like. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, an electric planer, and the like. The electric device is not specially limited in the embodiments of the present application.

[0143] The electric device of the embodiments of the present application has good operation reliability and use stability due to the configuration of the battery device 10.

[0144] The technical features of the above-described embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist, it should be considered that they are within the scope of the present application.

[0145] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A battery device, characterized by, The battery device comprises: a box body having a receiving cavity; a battery cell assembly arranged in the receiving cavity, the battery cell assembly comprising at least one battery cell; a sensor for detecting the swelling force of the battery cell; a connecting member connecting the sensor and a battery management system to transmit the detection information of the sensor to the battery management system; a sampling assembly for detecting the electrical parameters of the battery cell, the sampling assembly being connected to the battery management system.

2. The battery device according to claim 1, wherein: the connecting member is a wire; and / or the sampling assembly comprises a sampling member connected to the battery cell to collect the electrical parameters of the battery cell and a circuit board connected to the sampling member and the battery management system to transmit the collection information of the sampling member to the battery management system.

3. The battery device of claim 1, wherein The battery cell assembly comprises a plurality of battery cells arranged in sequence, and the sensor is arranged in the battery cell located at the end in the arrangement direction.

4. The battery device of claim 3, wherein The connecting member and the sensor form a butt joint, and the battery device further comprises an insulating packaging member for packaging the butt joint.

5. The battery device of claim 4, wherein The battery cell assembly further comprises a limiting member located at the end in the arrangement direction of the plurality of battery cells, the butt joint is located in the limiting member, and the insulating packaging member is connected to the limiting member so that the butt joint is fixed relative to the limiting member.

6. The battery device of claim 5, wherein The limiting member has opposite bottom and top portions in a direction perpendicular to the arrangement direction, at least part of the connecting member and the output end of the sensor extend to the top portion respectively, and the butt joint is formed by the connection at the top portion, and the insulating packaging member is connected to the top portion.

7. The battery device of claim 6, wherein The insulating packaging member and the top portion are distributed in layers.

8. The battery device of claim 5, wherein, The limiting member has a cavity inside, at least part of the battery management system is arranged in the cavity, and at least part of the connecting member extends to the cavity to be connected to the battery management system.

9. The battery device according to any one of claims 1 to 8, characterized by, The battery device further comprises a connecting terminal, and the connecting member is connected to the sensor through the connecting terminal.

10. The battery device according to any one of claims 1 to 8, characterized by The sensor is arranged on the wall surface with the largest area of the battery cell.

11. An electrical device, characterized by The electrical equipment comprises the battery device according to any one of claims 1 to 10.

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