Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device. The battery cell includes: a case including an opening; the electrode assembly is arranged in the shell; the top cover assembly covers the opening and comprises a top cover plate, an electrode terminal and a sampling assembly, the top cover plate comprises a substrate, an insulating layer and a conducting layer, the insulating layer is arranged between the substrate and the conducting layer, the electrode terminal penetrates through the top cover plate and is connected with the electrode assembly, and the sampling assembly is connected with the electrode terminal through the conducting layer; the sampling assembly is used for collecting parameter information of the battery monomer, the sampling assembly is connected with the electrode terminal through the conductive layer, the sampling assembly and the top cover plate are integrated together, and a connecting piece between the sampling assembly and the electrode terminal does not need to be additionally arranged, so that the processing difficulty and the preparation cost of the sampling assembly are reduced, and the overall integration level of the battery monomer is improved; the overall size of the sampling assembly and the top cover plate is reduced, and the energy density of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery monomer, a battery device and a power consumption device. BACKGROUND

[0002] Batteries are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes and electric tools, etc.

[0003] In the related art, a battery management system needs to set a sampling module to collect data of a battery monomer, so as to charge, discharge and protect the battery module according to the collected data. However, the sampling module has a complex structure, high preparation difficulty and cost, and needs to be improved. UTILITY MODEL CONTENT

[0004] In view of the above problems, the present application provides a battery monomer, a battery device and a power consumption device, which can reduce the preparation difficulty and cost of the sampling module.

[0005] In a first aspect, the present application provides a battery monomer, comprising: a shell comprising an opening; an electrode assembly arranged in the shell; a top cover assembly covering the opening, comprising a top cover plate, an electrode terminal and a sampling assembly, the top cover plate comprising a substrate, an insulating layer and a conductive layer, the insulating layer being arranged between the substrate and the conductive layer, the electrode terminal being arranged through the top cover plate and connected with the electrode assembly, the sampling assembly being connected through the conductive layer and the electrode terminal, and the sampling assembly being used for collecting parameter information of the battery monomer.

[0006] In the scheme of the present application, the battery monomer comprises a shell, an electrode assembly and a top cover assembly, the shell comprises an opening, the electrode assembly is arranged in the shell, and the top cover assembly covers the opening, the top cover assembly comprises a top cover plate, an electrode terminal and a sampling assembly, the top cover plate comprises a substrate, an insulating layer and a conductive layer, the insulating layer is arranged between the substrate and the conductive layer to insulate the conductive layer and the substrate, the electrode terminal is arranged through the top cover plate and connected with the electrode assembly to enable the electrode assembly to form a loop with external components, the sampling assembly is used for collecting parameter information of the battery monomer, the sampling assembly is connected through the conductive layer and the electrode terminal, the sampling assembly and the top cover plate are integrated together, no additional connecting member is needed between the sampling assembly and the electrode terminal, the processing difficulty and the preparation cost of the sampling assembly are reduced, the overall integration of the battery monomer is improved, the overall size of the sampling assembly and the top cover plate is reduced, and the energy density of the battery device is improved.

[0007] In some embodiments, the insulating layer is arranged on a side of the substrate away from the electrode assembly.

[0008] In the scheme of the embodiment of the application, the insulating layer is arranged on the side of the substrate away from the electrode assembly, so as to facilitate the communication connection of the sampling assembly and other components, and the problem of electrolyte corrosion of the sampling assembly is improved, and the setting difficulty of the sampling assembly is reduced.

[0009] In some embodiments, a groove is arranged on the side of the insulating layer away from the substrate, the top cover plate comprises a communication hole penetrating through the substrate and the groove bottom, and the electrode terminal is arranged in the groove and electrically connected to the electrode assembly through the communication hole.

[0010] In the scheme of the embodiment of the application, the insulating layer is arranged on the side of the substrate away from the electrode assembly, and the top cover plate comprises a communication hole penetrating through the substrate and the groove bottom, and the electrode terminal is arranged in the groove and electrically connected to the electrode assembly through the communication hole.

[0011] In some embodiments, the communication hole comprises a first communication hole and a second communication hole in communication with each other, the first communication hole penetrates through the groove bottom, and the second communication hole penetrates through the substrate, and the aperture of the first communication hole is smaller than that of the second communication hole.

[0012] In the scheme of the embodiment of the application, the communication hole comprises a first communication hole and a second communication hole in communication with each other, the first communication hole penetrates through the groove bottom, and the second communication hole penetrates through the substrate, and the aperture of the first communication hole is smaller than that of the second communication hole, so that when the electrode terminal is connected to the electrode assembly through the adapter mechanism, a gap exists between the adapter mechanism and the hole wall of the second communication hole, thereby improving the insulation reliability between the substrate and the electrode terminal.

[0013] In some embodiments, the insulating layer is arranged on the side of the substrate facing the electrode assembly.

[0014] In the scheme of the embodiment of the application, the insulating layer is arranged on the side of the substrate facing the electrode assembly, and after the top cover assembly covers the shell, the sampling assembly is located in the shell, so as to facilitate the sampling assembly to collect the parameter information inside the shell.

[0015] In some embodiments, the sampling assembly comprises at least one of a temperature sensor and a strain mechanism, the temperature sensor is used to acquire temperature information of the battery monomer, and the strain mechanism comprises a sampling circuit and a strain piece, the strain piece is arranged on the top cover plate, and the sampling circuit is used to collect the deformation value of the strain piece.

[0016] In the scheme of the embodiment of the application, the sampling assembly comprises at least one of a temperature sensor and a strain mechanism, the temperature sensor is used to acquire temperature information of the battery monomer, and the strain piece is arranged on the top cover plate, and the sampling circuit is used to collect the deformation value of the strain piece, so as to obtain the deformation information of the top cover plate, thereby representing the pressure condition inside the shell, without separately arranging a pressure sensor inside the shell, so as to reduce the setting cost and difficulty of the sampling assembly.

[0017] In some embodiments, the top cover assembly further comprises a pressure relief mechanism, the pressure relief mechanism is disposed on the substrate, and a pressure relief hole is disposed through the insulating layer, at least part of the pressure relief mechanism is exposed from the pressure relief hole.

[0018] In the scheme of the embodiments of the application, the top cover assembly further comprises a pressure relief mechanism, the pressure relief mechanism is used for relieving the pressure inside the shell, the pressure relief mechanism is disposed on the substrate, a pressure relief hole is disposed through the insulating layer, and at least part of the pressure relief mechanism is exposed from the pressure relief hole, so as to improve the problem that the insulating layer hinders the starting of the pressure relief mechanism and improve the reliability of the battery monomer.

[0019] In some embodiments, the conductive layer comprises a conductive wire, the conductive wire comprises a first segment and a second segment connected to each other, the first segment is arranged around and connected to the electrode terminal, and the second segment is connected to the sampling assembly.

[0020] In the scheme of the embodiments of the application, the conductive wire comprises a first segment and a second segment connected to each other, the first segment is arranged around and connected to the electrode terminal, and the second segment is connected to the sampling assembly, so as to improve the contact area between the conductive wire and the electrode terminal by the first segment arranged around the electrode terminal, and enhance the connection reliability between the sampling assembly and the electrode terminal.

[0021] In some embodiments, the top cover plate further comprises an isolation layer, the isolation layer covers the conductive layer, and the conductive layer is insulated from the external environment through the isolation layer.

[0022] In the scheme of the embodiments of the application, the top cover plate further comprises an isolation layer covering the conductive layer, the top cover plate is insulated from the external environment through the isolation layer, an additional top cover patch is not needed, the cost of the battery monomer is reduced, the risk of damage to the conductive layer is reduced, and the reliability of the battery monomer is improved.

[0023] In some embodiments, the thermal conductivity of the substrate is greater than that of air, and the sampling assembly is in thermal conduction connection with the substrate.

[0024] In the scheme of the embodiments of the application, the sampling assembly is in thermal conduction connection with the substrate, and the thermal conductivity of the substrate is greater than that of air, so that the temperature of the sampling assembly can be effectively adjusted through the substrate, and the reliability of the sampling assembly is improved.

[0025] In a second aspect, the application provides a battery device comprising the battery monomer of the first aspect.

[0026] In a third aspect, the application provides a power consumption device comprising the battery device of the third aspect. BRIEF DESCRIPTION OF DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not intended to be limiting of the application. Moreover, in the drawings, like reference numerals denote same or similar components. In the drawings:

[0028] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0029] Figure 2 is a structural schematic diagram of a battery provided by an embodiment of the present application;

[0030] Figure 3 is a structural schematic diagram of a battery module provided by an embodiment of the present application;

[0031] Figure 4 is an exploded view of a battery cell provided by an embodiment of the present application;

[0032] Figure 5 is a structural schematic diagram of a battery cell provided by an embodiment of the present application;

[0033] Figure 6 is a structural schematic diagram of a top cover assembly of a battery cell provided by an embodiment of the present application;

[0034] Figure 7 is a partial structural exploded view of a top cover assembly of a battery cell provided by an embodiment of the present application;

[0035] Figure 8 is a sectional view of a battery cell provided by an embodiment of the present application at A-A in Figure 6 ;

[0036] Figure 9 is a structural schematic diagram of a top cover assembly of a battery cell provided by an embodiment of the present application;

[0037] Figure 10 is a sectional view of a battery cell provided by an embodiment of the present application at B-B in Figure 9 ;

[0038] Figure 11 is a sectional view of a battery cell provided by another embodiment of the present application at A-A in Figure 6 ;

[0039] Figure 12 is a sectional view of a battery cell provided by another embodiment of the present application at B-B in Figure 9 .

[0040] BRIEF DESCRIPTION OF DRAWINGS

[0041] 1. Vehicle; 101. Motor; 102. Controller;

[0042] 2. Battery device; 201. Battery module; 202. Box; 2021. First box; 2022. Second box;

[0043] 3. Battery cell;

[0044] 4. Housing;

[0045] 5. Electrode assembly; 51. Tab; 52. Electrode body;

[0046] 6. Top cover assembly; 61. Top cover plate; 62. Electrode terminal; 63. Sampling assembly; 611. Base plate; 612. Insulating layer; 613. Conductive layer; 614. Conductive wire; 6121. Groove; 615. Communication hole; 641. First communication hole; 642. Second communication hole; 6141. First segment; 6142. Second segment; 64. Pressure relief mechanism; 6122. Pressure relief hole; 616. Isolation layer. DETAILED DESCRIPTION

[0047] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0048] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0049] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the purpose of facilitating the description of the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0050] In addition, the technical terms "first", "second" and the like are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0051] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, or internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0052] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature can be directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature can be directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0053] At present, from the development of market situation, the application of power battery is more and more widely. The power battery is not only applied to the energy storage power supply system of water power, fire 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 power battery, the demand of its market is also increasing.

[0054] The battery management system needs to set a sampling module to collect data of the battery monomer, so as to charge, discharge and protect the battery module according to the collected data.

[0055] In the related art, the sampling module and the battery monomer are independent of each other, and the sampling chip needs to be integrated on the circuit board to form a sampling module, and then the sampling module is electrically connected with the battery monomer through a nickel sheet support and the like to collect information of the battery monomer. However, the nickel sheet support and the like are complex and not easy to connect with the battery monomer.

[0056] To solve the above problems, the application provides a battery monomer, which comprises a shell, an electrode assembly and a top cover assembly. The shell comprises an opening, the electrode assembly is arranged in the shell, and the top cover assembly covers the opening. The top cover assembly comprises a top cover plate, an electrode terminal and a sampling assembly. The top cover plate comprises a substrate, an insulating layer and a conductive layer. The insulating layer is arranged between the substrate and the conductive layer to insulate the conductive layer and the substrate. The electrode terminal is arranged in the top cover plate and connected with the electrode assembly, so that the electrode assembly can form a loop with external components through the electrode terminal. The sampling assembly is used to collect parameter information of the battery monomer. The sampling assembly is connected with the electrode terminal through the conductive layer. The sampling assembly and the top cover plate are integrated together, and no connecting piece is additionally arranged between the sampling assembly and the electrode terminal, so as to reduce the processing difficulty and manufacturing cost of the sampling assembly, improve the overall integration of the battery monomer, and help to reduce the overall size of the sampling assembly and the top cover plate, and improve the energy density of the battery device.

[0057] The technical scheme described in the application is suitable for a battery device and a power consumption device using the battery device.

[0058] The power consumption device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. 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, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc. The application does not specially limit the above power consumption devices.

[0059] In the application, the battery monomer can be a secondary battery, which refers to a battery monomer that can be activated by charging after discharging.

[0060] The battery monomer can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc. The application does not specially limit the battery monomer. The battery monomer can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc. The application does not specially limit the battery monomer.

[0061] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery monomers to provide higher voltage and capacity. For example, the battery device mentioned in the present application can include a battery module or a battery pack, etc. The battery pack generally includes a box for packaging one or more battery monomers. The box can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery monomers.

[0062] The battery monomer includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. The battery monomer mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode current collecting portion and a positive electrode tab connected to the positive electrode current collecting portion, the positive electrode current collecting portion is coated with the positive electrode active material layer, and the positive electrode tab is not coated with the positive electrode active material layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material layer includes a positive electrode active material, which can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collecting portion and a negative electrode tab connected to the negative electrode current collecting portion, the negative electrode current collecting portion is coated with the negative electrode active material layer, and the negative electrode tab is not coated with the negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, which can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0063] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above-described battery device and electric equipment, but also can be applied to all battery devices including a box and electric equipment using the battery device, but for the sake of brevity of description, the following embodiments are described taking an electric vehicle as an example.

[0064] Please refer to Figure 1 , Figure 1 The structure schematic diagram of a vehicle 1 provided by some embodiments of the present application is shown. The vehicle 1 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid electric vehicle or a range extended vehicle, etc. The vehicle 1 is internally provided with a battery device 2, which can be arranged at the bottom, the head or the tail of the vehicle 1. The battery device 2 can be used for power supply of the vehicle 1, for example, the battery device 2 can be used as the operating power supply of the vehicle 1. The vehicle 1 can further include a controller 102 and a motor 101, and the controller 102 is used to control the battery to supply power to the motor 101, for example, to meet the working power demand of the vehicle 1 during starting, navigation and driving.

[0065] In some embodiments of the present application, the battery device 2 can not only serve as the operating power source of the vehicle 1, but also serve as the driving power source of the vehicle 1, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1.

[0066] Figure 2 A structural schematic diagram of the battery device of an embodiment of the present application is shown.

[0067] The battery device 2 mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells 3 connected in series, in parallel, or in a mixed connection through a busbar component.

[0068] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells 3.

[0069] As an example, the battery cell assembly can be a battery module 201 formed by arranging and fixing a plurality of battery cells 3 into an independent module. As an example, the battery module 201 can be formed by bundling a plurality of battery cells 3 with a cable tie.

[0070] In some embodiments, the battery device can be a battery pack including a box 202 and one or more battery cell assemblies accommodated in the box 202.

[0071] As an example, the battery cell assembly can be a battery module 201, which can be accommodated in the box by fixing the battery module 201 in the box.

[0072] As an example, the battery cell assembly can also be accommodated in the box 202 by directly fixing a plurality of battery cells 3 in the box 202.

[0073] As an example, the box 202 can include a first box 2021 and a second box 2022. The first box 2021 and the second box 2022 are buckled so that a closed space is formed inside the box 202 to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first box 2021 can be a top cover or a bottom plate.

[0074] As an example, the box 202 can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame so that a closed space is formed inside the box 202 to accommodate the battery cell assembly.

[0075] In some embodiments, the box 202 can be part of the chassis structure of the vehicle. For example, part of the box 202 can be at least part of the floor of the vehicle, or part of the box 202 can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0076] Figure 3 A structural schematic diagram of a battery module 201 according to an embodiment of the present application is shown.

[0077] In some embodiments, as shown in Figure 2 and Figure 3 , the battery monomer 3 is multiple, and the multiple battery monomers 3 are connected in series or parallel or mixed connection to form a battery module 201. Multiple battery modules 201 are connected in series or parallel or mixed connection to form a whole and are contained in the box 202.

[0078] The multiple battery monomers 3 in the battery module 201 can be electrically connected through the busbar component to realize the parallel or series or mixed connection of the multiple battery monomers 3 in the battery module 201.

[0079] Figure 4 is an exploded view of the battery monomer provided by an embodiment of the present application. The battery monomer 3 refers to the smallest unit that constitutes the battery. As shown in Figure 4 , the battery monomer 3 includes a top cover assembly 6, a shell 4 and an electrode assembly 5.

[0080] The electrode assembly 5 is a component that undergoes an electrochemical reaction in the battery monomer 3. The shell 4 can contain one or more electrode assemblies 5. The electrode assembly 5 is mainly formed by winding or stacking the electrode sheet. The electrode sheet is divided into positive electrode sheet and negative electrode sheet, and a separator is usually arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a part of active material constituting an electrode body 52, and each of the positive electrode sheet and the negative electrode sheet has a part without active material constituting a tab 51. The positive electrode tab and the negative electrode tab can be located at one end of the electrode body 52 or at two ends of the electrode body 52 respectively. In the charging and discharging process of the battery monomer 3, the positive active material and the negative active material react with the electrolyte, and the tab 51 connects the electrode terminal to form a current loop.

[0081] The electrode assembly 5 can be a winding structure, a laminated structure, or a hybrid structure of winding and laminating.

[0082] In some embodiments, the electrode assembly 5 is a winding structure. The positive electrode sheet and the negative electrode sheet are wound into a winding structure.

[0083] In some embodiments, the electrode assembly 5 is a laminated structure. As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately and laminatedly arranged, and a plurality of separators are arranged between any adjacent positive electrode sheets or negative electrode sheets, or the separators are continuously arranged and arranged between any adjacent positive electrode sheets or negative electrode sheets by folding.

[0084] In some embodiments, the shape of the electrode assembly 5 can be cylindrical, flat or multi-prism, etc.

[0085] In some embodiments, the electrode assembly 5 is provided with tabs, which can lead current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0086] The battery cell 3 can include a casing. The casing 4 is an assembly for fitting the top cover assembly 6 to form an internal environment of the battery cell 3, wherein the formed internal environment can be used to accommodate the electrode assembly 5, electrolyte (not shown in the figure), and other components. The casing 4 can be a steel casing, an aluminum casing, a plastic casing (such as polypropylene), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing 4 can be a sealed structure, or a non-sealed structure. As an example, when the casing 4 is a non-sealed structure, the casing 4 serves to protect the electrode assembly 5, and a sealing bag is further included between the casing 4 and the electrode assembly 5, which is used to package the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the casing 4 is a sealed structure, it is used to package the electrode assembly 5, the electrolyte, and other components.

[0087] As an example, the battery cell 3 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, including a square battery cell, a blade battery cell, a multi-prismatic battery cell (such as a hexagonal battery cell), etc., without specific limitation in the present application.

[0088] The casing 4 and the top cover assembly 6 can be independent components, and one or more openings can be provided on the casing 4, and the top cover assembly 6 covers the openings to form the internal environment of the battery cell 3. Alternatively, the top cover assembly 6 and the casing 4 can be integrated. Alternatively, the top cover assembly 6 and the casing 4 can form a common connecting surface before other components enter the casing, and then the top cover assembly 6 covers the casing 4 when it is necessary to seal the inside of the casing 4.

[0089] In some embodiments, the electrode terminal 62 can be provided on the top cover assembly 6 or the casing 4, and the electrode terminal 62 is electrically connected to the tab 51. The electrode terminal 62 can be directly connected to the tab 51, or indirectly connected to the tab 51 through the adapter 7.

[0090] Please refer to Figure 5 , Figure 6 and Figure 7 , Figure 5 is a structural schematic diagram of a battery cell according to an embodiment of the present application; Figure 6 is a structural schematic diagram of a top cover assembly of a battery cell according to an embodiment of the present application; Figure 7 is a partial structural exploded view of a top cover assembly of a battery cell according to an embodiment of the present application.

[0091] In a first aspect, as Figure 5 to Figure 7As shown, the battery monomer 3 includes a shell 4, an electrode assembly 5 and a top cover assembly 6, the shell 4 includes an opening; the electrode assembly 5 is arranged in the shell 4; the top cover assembly 6 covers the opening, and the top cover assembly 6 includes a top cover plate 61, an electrode terminal 62 and a sampling assembly 63, the top cover plate 61 includes a substrate 611, an insulating layer 612 and a conductive layer 613, the insulating layer 612 is arranged between the substrate 611 and the conductive layer 613, the electrode terminal 62 is arranged through the top cover plate 61 and connected with the electrode assembly 5, and the sampling assembly 63 is connected through the conductive layer 613 and the electrode terminal 62, and the sampling assembly 63 is used to collect parameter information of the battery monomer 3.

[0092] In the scheme of the embodiment of the application, the battery monomer 3 includes the shell 4, the electrode assembly 5 and the top cover assembly 6, the shell 4 includes the opening, the electrode assembly 5 is arranged in the shell 4, and the top cover assembly 6 covers the opening, and the top cover assembly 6 includes the top cover plate 61, the electrode terminal 62 and the sampling assembly 63, the top cover plate 61 includes the substrate 611, the insulating layer 612 and the conductive layer 613, the insulating layer 612 is arranged between the substrate 611 and the conductive layer 613 to insulate the conductive layer 613 and the substrate 611, the electrode terminal 62 is arranged through the top cover plate 61 and connected with the electrode assembly 5, so that the electrode assembly 5 can form a loop with external components through the electrode terminal, the sampling assembly 63 is used to collect parameter information of the battery monomer 3, the sampling assembly 63 is connected through the conductive layer 613 and the electrode terminal 62, the sampling assembly 63 and the top cover plate 61 are integrated together, and there is no need to additionally arrange a connecting piece between the sampling assembly 63 and the electrode terminal 62, so as to reduce the processing difficulty and the manufacturing cost of the sampling assembly 63, improve the overall integration of the battery monomer 3, help to reduce the overall size of the sampling assembly 63 and the top cover plate 61, and improve the energy density of the battery device.

[0093] Specifically, the top cover plate 61 includes the substrate 611, the insulating layer 612 and the conductive layer 613, and the substrate 611, the insulating layer 612 and the conductive layer 613 are sequentially stacked and pressed together to form the top cover plate 61, that is, the structural strength of the top cover plate 61 is jointly provided by the substrate 611 and the insulating layer 612.

[0094] The top cover assembly 6 covers the opening of the shell 4, and specifically, the substrate 611 is welded with the shell 4 to close the inner cavity of the shell 4.

[0095] Specifically, the substrate 611 is made of metal material to improve the structural strength of the top cover plate 61, and the material of the substrate 611 can be aluminum or stainless steel or aluminum alloy, etc.

[0096] Optionally, the material of the substrate 611 is the same as the material of the shell 4, so as to reduce the welding difficulty of the substrate 611 and the shell 4, and enhance the connection reliability of the top cover assembly 6 and the shell 4. For example, the material of the shell 4 is aluminum, and the material of the substrate 611 is aluminum; or the material of the shell 4 is stainless steel, and the material of the substrate 611 is stainless steel.

[0097] Optionally, the thickness of the substrate 611 is between 1 mm and 2.5 mm, which can improve the structural strength of the top cover plate 61 while reducing the overall thickness of the top cover plate 61. For example, the thickness of the substrate 611 is 1 mm, 2 mm, 2.5 mm, etc.

[0098] Optionally, the insulating layer 612 can be FR-4 material to improve the reliability of the battery monomer 3. For example, the insulating layer 612 is a composite material made of epoxy resin, filler and glass fiber.

[0099] Optionally, the insulating layer 612 covers the substrate 611 in the thickness direction, that is, the insulating layer 612 can cover the entire surface of the substrate 611 away from the electrode assembly 5, so as to improve the insulation performance between the substrate 611 and the conductive layer 613 and between the substrate 611 and the electrode terminal 62.

[0100] Optionally, the thickness of the insulating layer 612 is between 0.5 mm and 1.5 mm, which can improve the insulation reliability of the insulating layer 612 while reducing the overall thickness of the top cover plate 61. For example, the thickness of the substrate 611 is 0.5 mm, 1 mm, 1.5 mm, etc.

[0101] The conductive layer 613 includes a conductive wire 614. After the conductive layer 613 is pressed on the insulating layer 612, the conductive layer 613 is etched to form the conductive wire 614, which is connected between the electrode terminal 62 and the sampling assembly 63. For example, the material of the conductive layer 613 can be copper or copper alloy or gold, etc. The sampling assembly 63 is connected to the electrode terminal 62 through the conductive wire 614, so that the battery monomer 3 can supply power to the sampling assembly 63, and the sampling assembly 63 can collect the electrical signal of the battery monomer 3 through the electrode terminal 62.

[0102] Optionally, part of the material of the conductive layer 613 is arranged separately from the electrode terminal 62, the conductive wire 614 and the sampling assembly 63, and the material of the conductive layer 613 covering part of the area of the insulating layer 612 helps to improve the heat conduction rate of the top cover plate 61.

[0103] The electrode terminal 62 penetrates the top cover plate 61, and a through hole is formed in the insulating layer 612, the substrate 611 and the conductive layer 613, and the electrode terminal 62 is connected to the electrode assembly 5 through the through hole. The through hole can be formed in the insulating layer 612, the substrate 611 and the conductive layer 613 respectively, and then the insulating layer 612, the substrate 611 and the conductive layer 613 are pressed together; or the insulating layer 612, the substrate 611 and the conductive layer 613 are pressed together first, and then the through hole is formed.

[0104] Compared with the prior art, the sampling assembly 63 is first attached to the circuit board, and then the circuit board is fixed to the battery monomer 3. In the prior art, the sampling assembly 63 is connected to the electrode terminal 62 through the nickel sheet support. In the embodiment of the present application, the sampling assembly 63 is directly arranged on the top cover plate 61 by the surface mounting process, and is directly connected to the electrode terminal 62 through the conductive wire 614, so as to reduce the matching difficulty of the sampling assembly 63 and the battery monomer 3. In addition, the nickel sheet support and the circuit board are not required, so as to reduce the processing difficulty and the processing cost, and to help reduce the overall size of the battery monomer 3 and the sampling assembly 63, and to improve the energy density of the battery device.

[0105] The sampling assembly 63 is used to collect the parameter information of the battery monomer 3, and the parameter information includes but is not limited to voltage information, current information, resistance information, temperature information or power information, etc.

[0106] Optionally, the sampling assembly 63 includes a sampling chip and other components, and the components can be resistors or capacitors, etc. The sampling chip is electrically connected to the electrode terminal 62 to obtain the voltage, current, resistance or power of the battery monomer 3.

[0107] Optionally, the sampling assembly 63 can also include different sensors to obtain more parameter information of the battery monomer 3. For example, the sampling assembly 63 includes a temperature sensor to obtain the temperature parameter of the battery monomer 3, or the sampling assembly 63 includes a pressure sensor to obtain the internal pressure parameter of the battery monomer 3.

[0108] For example, the battery device includes a BMS (Battery Management System), and the BMS is in communication connection with the sampling assembly 63. After the sampling assembly 63 obtains the information of the battery monomer 3, the information is transmitted to the BMS.

[0109] In some embodiments, as shown in Figure 4 , Figure 5 and Figure 7 , the insulating layer 612 is arranged on the side of the substrate 611 away from the electrode assembly 5.

[0110] In these embodiments, the insulating layer 612 is arranged on the side of the substrate 611 away from the electrode assembly 5 to facilitate the communication connection of the sampling assembly 63 and other components and to improve the problem of electrolyte corrosion of the sampling assembly 63 in the shell 4 and to reduce the difficulty of arranging the sampling assembly 63.

[0111] The insulating layer 612 is pressed on the side of the substrate 611 away from the electrode assembly 5, and the sampling assembly 63 is also attached to the side of the top cover plate 61 away from the electrode assembly 5. The sampling assembly 63 is arranged outside the shell 4, and the top cover plate 61 separates the sampling assembly 63 from the electrolyte to reduce the risk of electrolyte corrosion of the sampling assembly 63. In addition, the sampling assembly 63 arranged outside the shell 4 also facilitates the communication connection of other components.

[0112] Optionally, the side of the substrate 611 facing the top cover assembly 6 is provided with an insulating glue to improve the insulation performance of the substrate 611 and the electrode assembly 5.

[0113] Please refer to Figure 8 , Figure 8 is a sectional view of a battery monomer at A-A in Figure 6 provided by an embodiment of the present application.

[0114] In some embodiments, as shown in Figure 5 and Figure 8 , the insulating layer 612 is provided with a groove 6121 on the side away from the substrate 611, the top cover plate 61 includes a communication hole 615 penetrating the substrate 611 and the bottom of the groove 6121, and the electrode terminal 62 is arranged in the groove 6121 and electrically connected to the electrode assembly 5 through the communication hole 615.

[0115] In these embodiments, the insulating layer 612 is provided with a groove 6121 on the side away from the substrate 611, the top cover plate 61 includes a communication hole 615 penetrating the substrate 611 and the bottom of the groove 6121, and the electrode terminal 62 is arranged in the groove 6121 and electrically connected to the electrode assembly 5 through the communication hole 615.

[0116] The surface of the insulating layer 612 is provided with a groove 6121 for accommodating a limiting part, and the shape of the groove 6121 is matched with the shape of the electrode terminal 62. For example, the electrode terminal 62 is circular, and the groove 6121 is a circular groove 6121. Alternatively, the electrode terminal 62 is rectangular, and the groove 6121 is a rectangular groove 6121.

[0117] The battery monomer 3 includes a switching mechanism, one end of which is connected to the electrode assembly 5, and the other end is connected to the electrode terminal 62 through the communication hole 615 to electrically connect the electrode terminal 62 and the electrode assembly 5.

[0118] The recess 6121 comprises a groove bottom opposite to the opening of the recess 6121, and a groove wall connected to the groove bottom and arranged around the groove bottom. When the electrode terminal 62 is accommodated in the recess 6121, the limiting portion is insulated from the substrate 611 by the groove bottom or the groove wall.

[0119] Optionally, the electrode terminal 62 is bonded or clamped in the recess 6121.

[0120] Optionally, the shape and size of the communication hole 615 can be designed as desired. For example, the communication hole 615 can be a circular hole or a rectangular hole.

[0121] In some embodiments, as shown in Figure 4 and Figure 8 , the communication hole 615 comprises a first communication hole 641 and a second communication hole 642 which are in communication with each other. The first communication hole 641 penetrates the groove bottom of the recess 6121, and the second communication hole 642 penetrates the substrate 611. The aperture of the first communication hole 641 is smaller than the aperture of the second communication hole 642.

[0122] In these embodiments, the communication hole 615 comprises a first communication hole 641 and a second communication hole 642 which are in communication with each other. The first communication hole 641 penetrates the groove bottom of the recess 6121, and the second communication hole 642 penetrates the substrate 611. The aperture of the first communication hole 641 is smaller than the aperture of the second communication hole 642. When the electrode terminal 62 is connected to the electrode assembly 5 through the adapter mechanism, a gap exists between the adapter mechanism and the hole wall of the second communication hole 642, so as to improve the insulation reliability between the substrate 611 and the electrode terminal 62.

[0123] The adapter mechanism is connected to the electrode terminal 62 by sequentially penetrating the second communication hole 642 and the first communication hole 641.

[0124] Optionally, the aperture of the first communication hole 641 is smaller than the aperture of the second communication hole 642, and the orthographic projection of the first communication hole 641 in the depth direction is located in the second communication hole 642. When the adapter mechanism penetrates the second communication hole 642, the adapter mechanism does not contact the hole wall of the second communication hole 642.

[0125] Optionally, the first communication hole 641 and the second communication hole 642 are coaxially designed, so as to reduce the risk of the adapter mechanism contacting the edge of the second communication hole 642.

[0126] Optionally, part of the insulation layer 612 is arranged around the second communication hole 642. The insulation layer 612 is arranged between the hole wall of the second communication hole 642 and the adapter mechanism, so as to improve the insulation reliability between the electrode terminal 62 and the substrate 611.

[0127] Please refer to Figure 9 and Figure 10 , Figure 9is a structural schematic view of a top cover assembly of a battery cell according to an embodiment of the present application; Figure 10 is a sectional view of the battery cell at B-B in Figure 9 .

[0128] In some embodiments, as shown in Figure 9 and Figure 10 , the insulating layer 612 is arranged on the side of the substrate 611 facing the electrode assembly 5.

[0129] In these embodiments, the insulating layer 612 is arranged on the side of the substrate 611 facing the electrode assembly 5, and the sampling assembly 63 is located in the housing 4 after the top cover assembly 6 is covered on the housing 4, so as to facilitate the sampling assembly 63 to collect the internal parameter information of the housing 4.

[0130] The electrode terminal 62 is insulatedly connected with the substrate 611, and the insulating layer 612 is provided with a through hole through which the switching mechanism is electrically connected with the electrode terminal 62.

[0131] For example, the sampling assembly 63 includes a temperature sensor, and the temperature sensor located on the side of the substrate 611 facing the electrode assembly 5 is closer to the electrode assembly 5, so as to more accurately collect the temperature information of the electrode assembly 5.

[0132] For example, the sampling assembly 63 includes a pressure sensor, and the pressure sensor located on the side of the substrate 611 facing the electrode assembly 5 is located in the housing 4, so that the sampling assembly 63 can reliably collect the internal pressure information of the housing 4.

[0133] Optionally, the surface of the conductive layer 613 is covered with an insulating material, so that the substrate 611 and the conductive layer 613 are both insulated from the electrode assembly 5, and the top cover assembly 6 does not need to be additionally provided with a lower plastic structure. The insulating material can be an insulating glue layer or an insulating paint, etc.

[0134] In some embodiments, as shown in Figure 4 and Figure 5 , the sampling assembly 63 includes at least one of a temperature sensor and a strain mechanism, the temperature sensor is used to obtain the temperature information of the battery cell 3, and the strain mechanism includes a sampling circuit and a strain piece, the strain piece is arranged on the top cover plate 61, and the sampling circuit is used to collect the deformation value of the strain piece.

[0135] In these embodiments, the sampling assembly 63 includes at least one of a temperature sensor and a strain mechanism, the temperature sensor is used to obtain the temperature information of the battery cell 3, and the strain piece is arranged on the top cover plate, and the sampling circuit is used to collect the deformation value of the strain piece, so as to obtain the deformation information of the top cover plate 61, thereby representing the internal pressure condition of the housing 4, without the need to separately arrange a pressure sensor in the housing 4, so as to reduce the setting cost and difficulty of the sampling assembly 63.

[0136] The sampling component 63 includes a temperature sensor, which is connected to a sampling chip so that the sampling component 63 can acquire temperature information of the battery cell 3.

[0137] The electrode assembly 5 is the main heat-generating component of the battery cell 3. Compared with the sampling module that is independent of the battery cell 3 in the prior art, the sampling assembly 63 and the top cover plate 61 are integrated together in this embodiment of the application. The distance between the temperature sensor and the electrode assembly 5 is smaller, so the temperature information obtained by the temperature sensor is more reliable.

[0138] For example, the temperature sensor can be a negative temperature coefficient thermistor.

[0139] For example, the strain element is a strain gauge.

[0140] A strain gauge is a component used to measure strain, consisting of a sensitive grid or similar material. The working principle of a resistance strain gauge is based on the strain effect, meaning that when a conductor or semiconductor material undergoes mechanical deformation under external force, its resistance changes accordingly.

[0141] Specifically, the strain gauge is installed on the top cover plate 61. During the deformation of the top cover plate 61, the strain gauge will deform, causing its resistance to change and generating different electrical signals. A sampling circuit is electrically connected to the strain gauge to collect its deformation value. Since the deformation of the top cover plate 61 can be caused by changes in internal pressure within the housing 4, the deformation of the strain gauge can characterize the internal pressure changes within the housing 4. Therefore, the strain gauge mechanism can replace the pressure sensor installed inside the housing 4 to obtain information on internal pressure changes.

[0142] For example, when the battery cell 3 experiences thermal runaway, the internal pressure of the casing 4 increases, causing the top cover plate 61 to deform. The acquisition circuit can then collect the deformation of the top cover plate 61 through the strain gauge to provide an early warning of thermal runaway for the battery cell 3.

[0143] In some embodiments, such as Figure 7 to Figure 10 As shown, the conductive layer 613 includes a conductive line 614, which includes a first segment 6141 and a second segment 6142 that are connected to each other. The first segment 6141 is arranged around and connected to the electrode terminal 62, and the second segment 6142 is connected to the sampling component 63.

[0144] In these embodiments, the conductive line 614 includes a first segment 6141 and a second segment 6142 that are connected to each other. The first segment 6141 is disposed around and connected to the electrode terminal 62, and the second segment 6142 is connected to the sampling component 63. The first segment 6141, which surrounds the electrode terminal 62, increases the contact area between the conductive line 614 and the electrode terminal 62, thereby enhancing the connection reliability between the sampling component 63 and the electrode terminal 62.

[0145] Optionally, the first segment 6141 and the second segment 6142 are integrally formed, reducing the processing difficulty of the conductive wire 614.

[0146] The first segment 6141 surrounds the electrode terminal 62, or in other words, the first segment 6141 surrounds the first through hole 641 of the insulating layer 612, and the first segment 6141 and the electrode terminal 62 are welded to be in conduction, and the second segment 6142 is connected to the first segment 6141 and the sampling assembly 63, so that the sampling assembly 63 and the electrode terminal 62 are electrically connected.

[0147] Illustratively, the top cover assembly 6 includes two electrode terminals 62 arranged at intervals, and the conductive wire 614 includes two first segments 6141 and two second segments 6142, the two first segments 6141 are arranged around the two electrode terminals 62 respectively, and the sampling assembly 63 is connected to the two second segments 6142, and the two second segments 6142 are connected to the two first segments 6141 respectively.

[0148] In some embodiments, as shown in Figure 7 to Figure 10 The top cover assembly 6 further includes a pressure relief mechanism 64, the pressure relief mechanism 64 is arranged on the base plate 611, the insulating layer 612 is provided with a pressure relief hole 6122, and at least part of the pressure relief mechanism 64 is exposed from the pressure relief hole 6122.

[0149] In these embodiments, the top cover assembly 6 further includes a pressure relief mechanism 64, the pressure relief mechanism 64 is used to release the pressure inside the shell 4, the pressure relief mechanism 64 is arranged on the base plate 611, the insulating layer 612 is provided with a pressure relief hole 6122, and at least part of the pressure relief mechanism 64 is exposed from the pressure relief hole 6122, so as to improve the problem that the insulating layer 612 hinders the activation of the pressure relief mechanism 64, and improve the reliability of the battery monomer 3.

[0150] The top cover assembly 6 includes a pressure relief mechanism 64 arranged on the base plate 611, when the pressure or temperature inside the shell 4 exceeds a threshold value, the pressure relief mechanism 64 is activated to release the pressure inside the battery monomer 3.

[0151] Optionally, the shape and size of the pressure relief hole 6122 can be designed by itself, illustratively, the pressure relief hole 6122 is rectangular or circular, etc.

[0152] Optionally, the pressure relief hole 6122 covers the pressure relief mechanism 64 in the orthographic projection of the base plate 611, so as to improve the problem that the insulating layer 612 hinders the activation of the pressure relief mechanism 64.

[0153] Optionally, the insulation layer 612 is arranged on the side of the substrate 611 facing the electrode assembly 5, and the insulation layer 612 is provided with a pressure relief hole 6122, so that the internal pressure of the shell 4 can act on the pressure relief mechanism 64 through the pressure relief hole 6122, thereby improving the problem that the insulation layer 612 hinders the activation of the pressure relief mechanism 64.

[0154] Optionally, the top cover assembly 6 further comprises a liquid injection hole penetrating the insulation layer 612 and the substrate 611, and the liquid injection hole is used to inject electrolyte into the shell 4. The pressure relief hole 6122 and the liquid injection hole are both arranged away from the conductive wire 614, so as to improve the problem that the conductive wire 614 hinders the activation of the pressure relief mechanism 64.

[0155] Optionally, the top cover assembly 6 comprises two electrode terminals 62 arranged away from each other, which are a positive electrode terminal and a negative electrode terminal, and the sampling assembly 63 is connected to the two electrode terminals. The pressure relief hole 6122 is located between the two electrode terminals 62, and the sampling assembly 63 can be arranged between the pressure relief hole 6122 and one of the electrode terminals 62, so as to shorten the size requirement of the conductive wire 614. For example, the liquid injection hole and the sampling assembly 63 are both located between the two electrode terminals 62, and the liquid injection hole and the sampling assembly 63 are located on the two sides of the pressure relief hole 6122.

[0156] In some embodiments, as shown in Figure 5 , Figure 8 and Figure 10 , the substrate 611 has a thermal conductivity greater than that of air, and the sampling assembly 63 is in thermal conduction with the substrate 611.

[0157] In these embodiments, the sampling assembly 63 is in thermal conduction with the substrate 611, and the substrate 611 has a thermal conductivity greater than that of air, so that the temperature of the sampling assembly 63 can be effectively adjusted through the substrate 611, thereby improving the reliability of the sampling assembly 63.

[0158] Optionally, the substrate 611 is made of metal, and the substrate 611 is welded to the shell 4. The heat generated by the sampling assembly 63 is transferred to the top cover plate 61 in the form of heat conduction, and is further transferred to the shell 4 and then to the external environment through the substrate 611, thereby improving the heat conduction efficiency of the sampling assembly 63. In addition, the sampling assembly 63 can also transfer heat to the air in the form of heat radiation.

[0159] The sampling assembly 63 is in thermal conduction with the substrate 611, so that the sampling assembly 63 can be directly connected to the substrate 611, or the sampling assembly 63 and the substrate 611 are arranged away from each other and are connected through a heat transfer medium.

[0160] For example, the sampling assembly 63 comprises a sampling chip and a balancing resistor, and the heat of the sampling chip and the balancing resistor is transferred to the substrate 611 and then to the shell 4 through the substrate 611, and is dissipated through the shell 4.

[0161] Please refer to Figure 11 and Figure 12 , Figure 11 is a sectional view of a battery monomer at A-A in Figure 6 of another embodiment provided by the present application. Figure 12 is a sectional view of a battery monomer at B-B in Figure 9 of another embodiment provided by the present application.

[0162] In some embodiments, as shown in Figure 8 to Figure 12 , the top cover plate 61 further comprises an isolation layer 616 covering the conductive layer 613, and the conductive layer 613 is insulated from the external environment through the isolation layer 616.

[0163] In these embodiments, the top cover plate 61 further comprises an isolation layer 616 covering the conductive layer 613, and the top cover plate 61 is insulated from other components through the isolation layer 616, without the need to additionally set a top cover patch, thereby reducing the cost of the battery monomer 3, reducing the risk of damage to the conductive layer 613, and improving the reliability of the battery monomer 3.

[0164] The conductive layer 613 comprises a conductive wire 614, and the isolation layer 616 covers the conductive wire 614, so that the conductive wire 614 is insulated from the external environment through the isolation layer 616.

[0165] Optionally, the insulating layer 612 is arranged on one side of the substrate 611 facing the electrode assembly 5, and the isolation layer 616 is arranged on one side of the insulating layer 612 facing the electrode assembly 5 and covers the conductive layer 613, so that the conductive layer 613 is insulated from the electrode assembly 5.

[0166] Optionally, the insulating layer 612 is arranged on one side of the substrate 611 away from the electrode assembly 5, and the isolation layer 616 is arranged on one side of the insulating layer 612 away from the electrode assembly 5 and covers the conductive layer 613, so that the conductive layer 613 is insulated from other components in the battery box (not shown in the figure). The other components can be a baffle, a wire harness plate, or a wall of the battery box.

[0167] Illustratively, the isolation layer 616 can be an insulating adhesive layer, or the isolation layer 616 can further comprise a green oil layer or a three-proofing paint layer, etc.

[0168] In a second aspect, the present application provides a battery device comprising the battery monomer of the first aspect.

[0169] In a third aspect, the present application provides a power consumption device comprising the battery device of the second aspect.

[0170] In some embodiments, as shown in Figure 1 to Figure 12As shown, the battery cell 3 comprises a shell 4, an electrode assembly 5 and a top cover assembly 6, the shell 4 comprises an opening; the electrode assembly 5 is arranged in the shell 4; the top cover assembly 6 covers the opening, and the top cover assembly 6 comprises a top cover plate 61, an electrode terminal 62 and a sampling assembly 63, the top cover plate 61 comprises a base plate 611, an insulating layer 612 and a conductive layer 613, the insulating layer 612 is arranged between the base plate 611 and the conductive layer 613, the insulating layer 612 is arranged on a side of the base plate 611 away from the electrode assembly 5, the electrode terminal 62 is arranged through the top cover plate 61 and connected with the electrode assembly 5, the conductive layer 613 comprises a conductive wire 614, the sampling assembly 63 is connected through the conductive wire 614 and the electrode terminal 62, a side of the insulating layer 612 away from the base plate 611 is provided with a groove 6121, the top cover plate 61 comprises a communication hole 615 penetrating the base plate 611 and the groove bottom of the groove 6121, the electrode terminal 62 is arranged in the groove 6121, the communication hole 615 comprises a first communication hole 641 and a second communication hole 642 in communication with each other, the first communication hole 641 penetrates the groove bottom of the groove 6121, the second communication hole 642 penetrates the base plate 611, an aperture of the first communication hole 641 is smaller than an aperture of the second communication hole 642, the conductive wire 614 comprises a first segment 6141 and a second segment 6142 connected with each other, the first segment 6141 is arranged around and connected with the electrode terminal 62, the second segment 6142 is connected with the sampling assembly 63, the top cover assembly 6 further comprises a pressure relief mechanism 64, the pressure relief mechanism 64 is arranged on the base plate 611, and a pressure relief hole 6122 is arranged through the insulating layer 612, at least part of the pressure relief mechanism 64 is exposed from the pressure relief hole 6122, the top cover plate 61 further comprises an isolation layer 616 covering the conductive layer 613, the conductive layer 613 is insulated from the external environment through the isolation layer 616, the thermal conductivity of the base plate 611 is greater than that of air, the sampling assembly 63 is in thermal conduction connection with the base plate 611, the sampling assembly 63 comprises at least one of a temperature sensor and a strain mechanism, the temperature sensor is used to obtain temperature information of the battery cell 3, the strain mechanism comprises a sampling circuit and a strain piece, the strain piece is arranged on the top cover plate 61, and the sampling circuit is used to collect a deformation value of the strain piece.

[0171] In the embodiments, the battery cell 3 comprises a shell 4, an electrode assembly 5 and a top cover assembly 6, the shell 4 comprises an opening, the electrode assembly 5 is arranged in the shell 4, and the top cover assembly 6 covers the opening, the top cover assembly 6 comprises a top cover plate 61, an electrode terminal 62 and a sampling assembly 63, the top cover plate 61 comprises a base plate 611, an insulating layer 612 and a conductive layer 613, the insulating layer 612 is arranged between the base plate 611 and the conductive layer 613 to insulate the conductive layer 613 and the base plate 611, the electrode terminal 62 is arranged through the top cover plate 61 and connected with the electrode assembly 5, so that the electrode assembly 5 can form a loop with external components through the electrode terminal, and the conductive layer 613 comprises a conductive wire 614, the sampling assembly 63 arranged on the side of the top cover plate 61 away from the electrode assembly 5 is connected with the electrode terminal 62 through the conductive wire 614, the sampling assembly 63 and the top cover plate 61 are integrated together, without the need to additionally arrange a connecting piece between the sampling assembly 63 and the electrode terminal 62, so as to reduce the processing difficulty and manufacturing cost of the sampling assembly 63, improve the overall integration of the battery cell 3, help to reduce the overall size of the sampling assembly 63 and the top cover plate 61, and improve the energy density of the battery device 2.

[0172] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The casing, including the opening; Electrode assembly, disposed within the housing; A top cover assembly, which covers the opening, includes a top cover plate, electrode terminals, and a sampling assembly. The top cover plate includes a substrate, an insulating layer, and a conductive layer. The insulating layer is disposed between the substrate and the conductive layer. The electrode terminals pass through the top cover plate and are connected to the electrode assembly. The sampling assembly is connected to the electrode terminals through the conductive layer. The sampling assembly is used to collect parameter information of the battery cell.

2. The battery cell according to claim 1, characterized in that, The insulating layer is disposed on the side of the substrate opposite to the electrode assembly.

3. The battery cell according to claim 2, characterized in that, The insulating layer has a groove on the side opposite to the substrate, and the top cover plate includes a through hole penetrating the substrate and the bottom of the groove. The electrode terminal is disposed in the groove, and the electrode terminal is electrically connected to the electrode assembly through the connecting hole.

4. The battery cell according to claim 3, characterized in that, The connecting hole includes a first connecting hole and a second connecting hole that are interconnected. The first connecting hole penetrates the bottom of the groove, and the second connecting hole penetrates the substrate. The diameter of the first connecting hole is smaller than the diameter of the second connecting hole.

5. The battery cell according to claim 1, characterized in that, The insulating layer is disposed on the side of the substrate facing the electrode assembly.

6. The battery cell according to any one of claims 1-5, characterized in that, The sampling component includes at least one of a temperature sensor and a strain mechanism. The temperature sensor is used to acquire the temperature information of the battery cell. The strain mechanism includes a sampling circuit and a strain element. The strain element is disposed on the top cover plate. The sampling circuit is used to acquire the deformation value of the strain element.

7. The battery cell according to any one of claims 1-6, characterized in that, The top cover assembly also includes a pressure relief mechanism disposed on the substrate, and the insulating layer is provided with a pressure relief hole, with at least a portion of the pressure relief mechanism exposed through the pressure relief hole.

8. The battery cell according to any one of claims 1-7, characterized in that, The conductive layer includes conductive lines, each conductive line comprising a first segment and a second segment connected to each other. The first segment is arranged to surround and connect to the electrode terminals, and the second segment is connected to the sampling component.

9. The battery cell according to any one of claims 1-8, characterized in that, The top cover plate also includes an isolation layer that covers the conductive layer and insulates the conductive layer from the external environment through the isolation layer.

10. The battery cell according to any one of claims 1-9, characterized in that, The thermal conductivity of the substrate is greater than that of air, and the sampling component is thermally connected to the substrate.

11. A battery device, characterized in that, It includes at least one battery cell as described in any one of claims 1-10 above.

12. An electrical appliance, characterized in that, Includes the battery device as described in claim 11.

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