Battery monomer, sealing nail, battery device, energy storage device, energy storage system, power utilization device and charging network

Abstract

The embodiment of the utility model provides a battery monomer, a sealing nail, a battery device, an energy storage device, an energy storage system, a power utilization device and a charging network, and belongs to the technical field of batteries. The battery monomer comprises a shell, a top cover and a sealing nail, the top cover covers an opening of the shell and is provided with a liquid injection hole, and the sealing nail is mounted on the top cover and is used for sealing the liquid injection hole; the sealing nail comprises a body, a sealing part and a sealing part, and an accommodating cavity is formed in the body; and the temperature sampling structure is mounted in the accommodating cavity and is suitable for being separated from an electrode assembly of the battery monomer through the body. The temperature sampling structure is integrated in the body of the sealing nail, so that the temperature monitoring in the battery monomer is realized, the accuracy of temperature detection is improved, the integrated level and compactness of the whole battery monomer are improved, the space utilization rate of the temperature sampling structure is improved, the assembly process of the temperature sampling structure is simplified, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to a battery cell, a sealing nail, a battery device, an energy storage device, an energy storage system, an electric device and a charging network. Background Art

[0002] In existing battery devices, temperature sampling is required to monitor the tooling and thermal runaway status of battery cells. However, traditional temperature sampling structures generally have the following two disadvantages: first, the accuracy of temperature detection is low, which affects the thermal management efficiency of the battery device; second, the assembly process of the temperature sampling structure is too complicated and cumbersome, and the degree of modularization is low. Utility Model Content

[0003] The present application provides a battery cell, a sealing nail, a battery device, an energy storage device, an energy storage system, an electrical device and a charging network to improve the accuracy of temperature detection and simplify the assembly process of the temperature sampling structure.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, which is applied to a battery device, comprising: a shell, a top cover and a sealing nail, wherein the top cover is arranged at the opening of the shell and has a liquid injection hole, and the sealing nail is installed on the top cover to seal the liquid injection hole; wherein the sealing nail comprises:

[0005] A body, wherein the body forms a receiving cavity;

[0006] A temperature sampling structure is installed in the accommodating cavity and is suitable for being separated from the electrode assembly of the battery cell by the body.

[0007] In the above technical solution, by integrating the temperature sampling structure into the body of the sealing nail, on the one hand, the temperature monitoring inside the battery cell is realized, which greatly improves the accuracy of temperature detection, thereby effectively improving the thermal management efficiency of the battery device; on the other hand, a high degree of modularization of the body and the temperature sampling structure is achieved, which increases the overall integration and compactness of the battery cell, thereby improving the space utilization of the temperature sampling structure while simplifying the assembly process of the temperature sampling structure, which helps to reduce production costs.

[0008] In some embodiments, the accommodating cavity includes a first accommodating groove and a second accommodating groove that are connected; the body includes:

[0009] A nail body, the nail body is used to be inserted into the injection hole and form a first receiving groove;

[0010] A nail cap is connected to the nail body and the top cover to form a second receiving groove.

[0011] In some embodiments, the temperature sampling structure includes:

[0012] A temperature sensor, the temperature sensor is installed in the first containing groove and is arranged close to the bottom wall of the first containing groove;

[0013] A transfer member, at least a portion of which is mounted in the second receiving groove;

[0014] A lead wire is installed in the first receiving groove and connected between the temperature sensor and the adapter.

[0015] In some embodiments, a thickness of a portion of the adapter located in the second receiving groove is smaller than a depth of the second receiving groove.

[0016] In some embodiments, the adapter comprises:

[0017] substrate;

[0018] A first welding portion, the first welding portion is connected to the first surface of the substrate, is protruded relative to the first surface in a direction close to the temperature sensor, and is used for welding and connecting with the lead wire;

[0019] A second welding portion, the second welding portion is connected to the second surface of the substrate, protrudes relative to the second surface in a direction away from the temperature sensor, and is used for welding and connecting to the sampling circuit board of the battery device, the first welding portion is electrically connected to the second welding portion, wherein the first surface and the second surface are arranged on opposite sides of the substrate.

[0020] In some embodiments, the substrate includes a first transition section and a second transition section connected to each other, the first welding portion is provided on the first transition section, the second welding portion is provided on the second transition section, the first transition section is installed on the first accommodating groove, and the second transition section is installed on the second accommodating groove; wherein, the width of the first transition section is smaller than the width of the second transition section, and the width of the first accommodating groove is smaller than the width of the second accommodating groove.

[0021] In some embodiments, the sealing nail further comprises:

[0022] A sealant is provided, wherein the sealant at least wraps the first welding portion, the lead wire and the temperature sensor.

[0023] In some embodiments, the accommodating cavity further includes a third accommodating groove connected to a side of the second accommodating groove away from the first accommodating groove, and the nail cap forms the third accommodating groove; the sealing nail further includes:

[0024] A magnetic member is installed in the third receiving groove and is used for attracting the sampling circuit board of the battery device.

[0025] In some embodiments, the thickness of the magnetic member is smaller than the depth of the third receiving groove.

[0026] In some embodiments, the magnetic member is protruding inwardly and disposed on a side wall of the third receiving groove, and an orthographic projection of the magnetic member along the axial direction of the sealing pin does not overlap with an orthographic projection of the second receiving groove along the axial direction of the sealing pin.

[0027] In some embodiments, the sealing nail has a threaded connection structure for connecting with the top cover, and is provided with a sealing member for sealingly cooperating with the injection hole.

[0028] In a second aspect, an embodiment of the present application provides a sealing nail, which is applied to a battery cell, comprising:

[0029] A body, the body being used to be mounted on the top cover of the battery cell and to seal the injection hole of the top cover, the body forming a receiving cavity;

[0030] A temperature sampling structure is installed in the accommodating cavity and is suitable for being separated from the electrode assembly of the battery cell by the body.

[0031] In a third aspect, an embodiment of the present application provides a battery device, including:

[0032] A battery management system and a sampling circuit board, wherein the sampling circuit board is electrically connected to the battery management system;

[0033] In the battery cell as described in any one of the above, the temperature sampling structure of the battery cell is electrically connected to the sampling circuit board.

[0034] In a fourth aspect, an embodiment of the present application provides an energy storage device, comprising: a plurality of battery cells as described in any one of the above or a plurality of battery devices as described in the above, wherein the battery cells or the battery devices are used to store or provide electrical energy.

[0035] In a fifth aspect, an embodiment of the present application provides an energy storage system, comprising: a power conversion device and an energy storage device as described above, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0036] In a sixth aspect, an embodiment of the present application provides an electrical device, comprising: a battery cell as described in any one of the above, a battery device as described in the above, an energy storage device as described in the above, or an energy storage system as described in the above, wherein the battery cell or the battery device is used to store or provide electrical energy.

[0037] In a seventh aspect, an embodiment of the present application provides a charging network, characterized in that it includes: a charging pile and an energy storage device as described above or the energy storage system as described above, wherein the energy storage device is used to provide electrical energy for the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 A schematic diagram of the structure of an energy storage system provided in some embodiments of the present application;

[0040] Figure 2 A schematic diagram of the structure of a charging network provided in some embodiments of the present application;

[0041] Figure 3 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0042] Figure 4 An exploded view of the structure of a battery device provided in some embodiments of the present application;

[0043] Figure 5 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0044] Figure 6 A top view of a battery cell provided for some embodiments of the present application;

[0045] Figure 7 A schematic diagram of the structure of a sealing pin provided in some embodiments of the present application;

[0046] Figure 8 An exploded view of the structure of a sealing pin provided in some embodiments of the present application;

[0047] Fig. 9 A top view of a sealing pin provided in some embodiments of the present application;

[0048] Fig.10 A cross-sectional view of a sealing pin provided in some embodiments of the present application;

[0049] Fig.11 A cross-sectional view of a body and a magnetic member provided for some embodiments of the present application;

[0050] Fig.12 A schematic diagram of a temperature sampling structure provided in some embodiments of the present application;

[0051] Fig.13 One of the structural schematic diagrams of the adapter provided in some embodiments of the present application;

[0052] Fig.14 The second structural schematic diagram of the adapter provided in some embodiments of the present application.

[0053] Reference numerals:

[0054] Energy storage device 1, power conversion device 2, power generation equipment 3, charging pile 4, connector 5;

[0055] Vehicles 1000;

[0056] Battery device 100;

[0057] Box body 10, first box body 11, second box body 12;

[0058] Battery cell 20, housing 21, top cover 22;

[0059] Sealing nail 23,

[0060] Main body 231, nail body 2311, nail cap 2312, accommodating cavity 2313, first accommodating groove 23131, second accommodating groove 23132, third accommodating groove 23133;

[0061] Temperature sampling structure 232, temperature sensor 2321, adapter 2322, first adapter section 23221, first welding portion 23222, second adapter section 23223, second welding portion 23224, lead wire 2323;

[0062] Sealant 233, magnetic member 234, sealing member 235;

[0063] Controller 200; Motor 300. DETAILED DESCRIPTION

[0064] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0065] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0066] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0067] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0068] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0069] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0070] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0071] The battery cell 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., which is not limited in the embodiments of the present application.

[0072] The battery cell can be cylindrical, flat, rectangular or other shapes, and the present application embodiment does not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the present application embodiment does not limit this.

[0073] The battery cell includes a shell, an electrode assembly and an electrolyte, and the shell is used to contain the electrode assembly and the electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell 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 collector and a positive electrode active material layer. The positive electrode collector includes a positive electrode collector body and a positive electrode ear. The positive electrode active material layer is coated on the surface of the positive electrode collector body. The positive electrode ear is not coated with the positive electrode active material layer and protrudes from the positive electrode collector body. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode collector includes a negative electrode collector body and a negative electrode ear. The negative electrode active material layer is coated on the surface of the negative electrode collector body. The negative electrode ear is not coated with the negative electrode active material layer and protrudes from the negative electrode collector body. The negative electrode current collector may be made of copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current is passed without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.

[0074] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0075] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Battery cells are used to store or provide electrical energy.

[0076] The inventors found that in order to ensure the stability and safety of the battery cell during operation, it is necessary to monitor the temperature inside the battery in real time. In the related art, the sampling interface of the temperature sampling structure is concentrated on the bus or the outer surface of the shell of the battery cell. However, in actual applications, on the one hand, because the bus undertakes the function of overcurrent, the temperature of the bus is usually higher than the actual temperature of the internal battery cell during high current; on the other hand, the shell itself has the thickness and thermal resistance of the shell material, so there is still a non-negligible difference between the temperature on the shell and the temperature of the internal battery cell. Therefore, whether it is collecting the temperature of the bus or the temperature of the outer surface of the shell, the accuracy of the temperature detection is difficult to achieve high precision requirements. In addition, the current temperature sampling structure usually achieves fixed installation between the temperature sampling component and the corresponding measurement position through the matching of glue or compression structure, which makes the assembly process of the temperature sampling structure too complicated and cumbersome, and the degree of modularization is low, which not only affects the overall space utilization, but also is not conducive to cost control.

[0077] Based on the above considerations, in order to solve the problem of low accuracy and poor overall integration of the temperature sampling structure, the inventor has designed a battery cell after in-depth research. The battery cell includes: a shell, a top cover and a sealing nail. The top cover is arranged at the opening of the shell, and the top cover is provided with a liquid injection hole. The sealing nail is installed on the top cover to seal the liquid injection hole; wherein the sealing nail includes: a body and a temperature sampling structure. The body forms a receiving cavity; the temperature sampling structure is installed in the receiving cavity, and the temperature sampling structure is suitable for being separated from the electrode assembly of the battery cell by the body.

[0078] In a battery cell of this structure, by integrating the temperature sampling structure into the body of the sealing nail, this structure, on the one hand, realizes temperature monitoring inside the battery cell compared to the traditional method of only testing the bus or shell surface temperature, effectively avoids the temperature conversion error caused by the shell and bus, and greatly improves the accuracy of temperature detection. On the other hand, the sealing nail integrates the temperature sampling function while taking into account the original function. The temperature sampling structure occupies the volume of the effective pole area inside the battery cell, increases the overall integration and compactness of the battery cell, improves space utilization, and achieves cost control.

[0079] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0080] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0081] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0082] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0083] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0084] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0085] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0086] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0087] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0088] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery devices, such as mobile phones, portable devices, laptop computers, battery vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Battery devices are used to store or provide electrical energy.

[0089] The embodiment of the present application provides an energy storage device, including one or more battery clusters (Battery Cluster) to increase the voltage and capacity of the energy storage device. The battery cluster may include multiple battery devices, and the multiple battery devices are connected in series through a busbar component to increase the voltage of the energy storage device. When the energy storage device includes multiple battery clusters, the multiple battery clusters are connected in parallel to increase the capacity of the energy storage device.

[0090] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low electricity consumption and provide electrical energy to relevant users or electrical devices during peak electricity consumption. The energy storage system provided in the embodiment of the present application can be any power system that requires the use of an energy storage device.

[0091] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0092] In some embodiments, the energy storage device may include a cabinet and one or more battery clusters, wherein the battery clusters are housed in the cabinet.

[0093] In some embodiments, the energy storage device may include modules such as a thermal management module, a main control module, a master control module, a power distribution module, and a fire protection module.

[0094] As an example, the thermal management module may include a liquid cooling unit that provides cooling liquid for regulating the temperature of the battery cells to each battery device through a pipeline.

[0095] As an example, the main control module can be used as a battery management unit of a battery cluster to monitor and manage the battery cluster. The main control module can monitor information such as the current, voltage, power or temperature of the battery cluster. For example, the charging and discharging current and voltage of the battery cluster can be controlled. The main control module includes a slave battery management unit SBMU (SBMU), a fusion switch and other modules.

[0096] As an example, the master control module can be used as a battery management unit of an energy storage device to monitor and manage the energy storage device. The master control module can monitor information such as the current, voltage, power, state of charge or temperature of the energy storage device. For example, the charging and discharging current, voltage, etc. of the energy storage device can be controlled. As an example, the master control module includes an insulation monitoring module IMM (Insulation Monitoring Module, abbreviated as IMM), a master battery management unit MBMU (Master Battery Management Unit, MBMU), Ethernet ETH (EtherNet, ETH) and a fiber optic conversion module and other modules.

[0097] As an example, the fire protection system includes a control panel, detectors, alarm devices, etc., which are used to detect, alarm or extinguish fire in the energy storage system.

[0098] As an example, the power distribution device may be used to distribute power to the power modules of the energy storage device.

[0099] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using energy storage devices, such as mobile phones, portable devices, laptop computers, battery vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Energy storage devices are used to store or provide electrical energy.

[0100] In some embodiments, Figure 1 As shown, the energy storage system may include one or more energy storage devices 1 and a power converter 2 (Power Converter System, PCS for short), and the power converter 2 is used to be connected between the power generation device 3 and the energy storage device 1. The power generation device 3 is used to generate electric energy, and the electric energy generated by the power generation device 3 can be stored in the energy storage device 1 through the power converter 2. As an example, the power generation device 3 may specifically be a solar panel, a hydroelectric power generation device, a thermal power generation device, a wind power generation device, etc. Among them, the specific type of the power generation device 3 is not limited in this application.

[0101] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using energy storage systems, such as mobile phones, portable devices, laptop computers, battery vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Energy storage devices are used to store or provide electrical energy.

[0102] Please refer to Figure 2 The embodiment of the present application provides a charging network, including a charging pile 4 and an energy storage device 1, wherein the charging pile 4 is electrically connected to the energy storage device 1, and the energy storage device 1 is used to provide electric energy to the charging pile 4. The charging pile 4 is electrically connected to the battery device in the energy storage device 1 through a cable, and the battery device can provide its stored electric energy to the charging pile 4. The charging pile 4 has one or more connectors 5, which are used to connect to an electric device (such as a vehicle) so as to replenish energy to the electric device.

[0103] The energy storage device can be located inside the charging pile (such as an integrated storage and charging machine) or outside the charging pile.

[0104] The embodiment of the present application provides an electric device using a battery cell or a battery device or an energy storage device or an energy storage system as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, and a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0105] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0106] Please refer to Figure 3 , Figure 3 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle, and the battery device 100 may be provided at the bottom, head or tail of the vehicle. The battery device 100 may be used to power the vehicle, for example, the battery device 100 may be used as an operating power source for the vehicle. The vehicle may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle during driving.

[0107] In some embodiments of the present application, the battery device 100 can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0108] Please refer to Figure 4 , Figure 4 The structural exploded diagram of the battery device 100 provided in some embodiments of the present application. The battery device 100 includes a box body 10 and a plurality of battery cells 20, and the battery cells 20 are used to be accommodated in the box body 10. Among them, the box body 10 is used to provide an assembly space for the battery cells 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20. The second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12. Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0109] In the battery device 100, multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that multiple battery cells 20 are connected in series and in parallel. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by multiple battery cells 20 is accommodated in the box 10; of course, the battery device 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery device 100 may also include other structures, for example, the battery device 100 may also include a busbar component for realizing electrical connection between multiple battery cells 20.

[0110] Please refer to Figure 4 , Figure 4 A partial structural diagram of a battery device 100 provided in some embodiments of the present application. The battery device 100 includes multiple rows of battery cells 20, and the multiple rows of battery cells 20 are arranged along a first direction, and each row of battery cells 20 includes multiple battery cells 20 arranged along a second direction. The first direction and the second direction are respectively the length direction of the box body 10 and the width direction of the box body 10, and the first direction and the second direction are perpendicular to each other.

[0111] According to some embodiments of the present application, referring to Figure 5 , and please refer to Figure 6 The present application provides a battery cell 20, which is applied to a battery device 100. The battery cell 20 includes: a shell 21, a top cover 22 and a sealing nail 23. The top cover 22 is covered at the opening of the shell 21, and the top cover 22 is provided with a liquid injection hole. The sealing nail 23 is installed on the top cover 22, and the sealing nail 23 is used to seal the liquid injection hole.

[0112] Among them, Figure 7-10 As shown, the sealing nail 23 includes: a body 231 and a temperature sampling structure 232 , the body 231 forms a receiving cavity 2313 ; the temperature sampling structure 232 is installed in the receiving cavity 2313 , and the temperature sampling structure 232 is suitable for being separated from the electrode assembly of the battery cell 20 by the body 231 .

[0113] like Figure 7-10 As shown, the body 231 is a sealing nail structure commonly used in the battery field, which is used to seal the injection hole after the electrolyte is injected. The body 231 can be made of non-metallic material or non-magnetic metal material, such as plastic, aluminum, etc.

[0114] The body 231 can be fixed to the top cover 22 by threaded connection, welding or other methods, which are not limited here.

[0115] For example, in some embodiments, the body 231 may be fixed to the top cover 22 by welding.

[0116] For example, in other embodiments, the body 231 may be fixed to the top cover 22 by threaded connection.

[0117] like Figure 8 , Fig.10 and Fig.11 As shown, the accommodating cavity 2313 can be designed as a semi-open space to facilitate the installation of the temperature sampling structure 232 while not interfering with the connection between the temperature sampling structure 232 and an external sampling circuit board.

[0118] The temperature sampling structure 232 is a device for monitoring the internal temperature of the battery cell 20 . The temperature sampling structure 232 can transmit the temperature signal to a battery management system (BMS) or other monitoring devices through a wire or wirelessly.

[0119] The temperature sampling structure 232 is placed in the body 231 . The body 231 having a certain strength can fully help the temperature sampling structure 232 avoid direct external force and play a better physical protection role.

[0120] The temperature sampling structure 232 can be fixed in the accommodating cavity 2313 by welding, bonding, transition fit, interference fit or other methods, which are not limited here.

[0121] For example, in some embodiments, the body 231 may be fixed to the top cover 22 by bonding and transition fit.

[0122] For example, in some other embodiments, the body 231 may be fixed to the top cover 22 by welding.

[0123] For example, in some other embodiments, the body 231 may be fixed to the top cover 22 by welding or bonding.

[0124] It is understandable that if Figure 7-10As shown, based on the temperature sampling structure 232 being installed in the accommodating cavity 2313, on the one hand, by integrating the temperature sampling structure 232 into the body 231 of the sealing nail 23, the temperature monitoring inside the battery cell 20 is realized. Compared with the traditional indirect testing method of the bus or shell surface temperature, this design effectively avoids the temperature conversion error caused by the shell and the bus, thereby greatly improving the accuracy of temperature detection; on the other hand, the temperature sampling structure 232 can be directly installed into the sealing nail 23. While maintaining the original sealing function, the sealing nail 23 integrates the temperature sampling function, solving the redundancy problem caused by the independent setting of the temperature sampling structure 232. This design makes it unnecessary for the temperature sampling structure 232 to occupy the effective pole piece area volume inside the battery cell 20 alone, thereby improving the overall integration and compactness of the battery cell 20, thereby improving the space utilization rate, and at the same time, there is no need to add other installation components to assist in assembly, simplifying the assembly process of the temperature sampling structure 232, realizing the high modularization of the body 231 and the temperature sampling structure 232, and helping to reduce production costs.

[0125] In actual implementation, Figure 5 and Figure 6 As shown, when the temperature sampling component is not powered on, the sealing pin 23 only serves as a sealing pin 23, and serves as a sealing injection port on the top cover 22 after the electrolyte is injected. If replacement is required, the conventional replacement of the sealing pin 23 can be directly performed without causing damage to other components. When the temperature sampling component is powered on, that is, the temperature sampling component is connected to the external sampling circuit board, the temperature sampling component, the sampling circuit board and the battery management system can form a closed loop, so that the battery management system can monitor the temperature state of each battery cell 20 inside the housing 21 under working conditions.

[0126] The battery cell 20 provided in the embodiment of the present application integrates the temperature sampling structure 232 into the body 231 of the sealing nail 23 as described above. On the one hand, the temperature monitoring inside the battery cell 20 is realized, which greatly improves the accuracy of temperature detection, thereby effectively improving the thermal management efficiency of the battery device 100. On the other hand, the body 231 and the temperature sampling structure 232 are highly modularized, which increases the overall integration and compactness of the battery cell 20, thereby improving the space utilization of the temperature sampling structure 232 and simplifying the assembly process of the temperature sampling structure 232, which helps to reduce production costs.

[0127] According to some embodiments of the present application, Figure 8 , Fig.10 and Fig.11As shown, the accommodating cavity 2313 includes a first accommodating groove 23131 and a second accommodating groove 23132 which are connected; the main body 231 includes: a nail body 2311 and a nail cap 2312, the nail body 2311 is used to be inserted into the injection hole, and the nail body 2311 forms a first accommodating groove 23131; the nail cap 2312 is connected to the nail body 2311, the nail cap 2312 is connected to the top cover 22, and the nail cap 2312 forms a second accommodating groove 23132.

[0128] The shape of the first receiving groove 23131 can be designed to be circular, triangular, square, pentagonal, hexagonal or other shapes, etc., which is not limited here.

[0129] For example, in some embodiments, Figure 7 and Figure 9-11 As shown, the shape of the first receiving groove 23131 can be designed to be circular.

[0130] The shape of the second receiving groove 23132 can be designed to be circular, triangular, square, pentagonal, hexagonal or other shapes, etc., which is not limited here.

[0131] For example, in some embodiments, Figure 7 and Figure 9-11 As shown, the shape of the second receiving groove 23132 can be designed to be circular.

[0132] The nail body 2311 is the tail of the sealing nail 23, and the nail body 2311 is suitable for sealing with the injection hole. A first receiving groove 23131 can be formed inside the nail body 2311, and the first receiving groove 23131 is used to install a part of the temperature sampling structure 232. The nail cap 2312 is the head of the sealing nail 23, and the nail cap 2312 can be closely contacted and fixed with the top cover 22 by bonding, welding or threaded connection. A second receiving groove 23132 can be formed inside the nail cap 2312, and the second receiving groove 23132 is connected with the first receiving groove 23131, and the second receiving groove 23132 is used to install another part of the temperature sampling structure 232.

[0133] In actual design, the shape and size of the nail body 2311 can be determined according to the shape and size of the injection hole and the requirements of the temperature sampling structure 232, and the shape and size of the nail cap 2312 can be determined according to the connection method between it and the top cover 22 and the requirements of the temperature sampling structure 232.

[0134] The battery cell 20 provided in the embodiment of the present application realizes the connection between the temperature sampling structure 232 and the nail body 2311 and the nail cap 2312 through the structural design that the temperature sampling structure 232 is installed in the first receiving groove 23131 and the second receiving groove 23132. Since the nail body 2311 is closer to the internal center of the battery cell 20, the temperature sampling structure 232 at least partially installed on the nail body 2311 can more accurately monitor the temperature distribution inside the battery cell 20, thereby further improving the accuracy and reliability of temperature monitoring.

[0135] According to some embodiments of the present application, Figure 8 , Fig.10 and Fig.12 As shown, the temperature sampling structure 232 includes: a temperature sensor 2321, an adapter 2322 and a lead 2323. The temperature sensor 2321 is installed in the first receiving groove 23131, and the temperature sensor 2321 is arranged close to the bottom wall of the first receiving groove 23131; at least part of the adapter 2322 is installed in the second receiving groove 23132; the lead 2323 is installed in the first receiving groove 23131, and the lead 2323 is connected between the temperature sensor 2321 and the adapter 2322.

[0136] The temperature sensor 2321 is used to obtain temperature information, and the temperature sensor 2321 may include but is not limited to a thermocouple sensor, a thermistor sensor, and the like.

[0137] The adapter 2322 can serve as an intermediate medium to help the temperature sensor 2321 to be electrically connected to the sampling circuit board, so that the temperature information collected by the temperature sensor 2321 can be transmitted to the sampling circuit board through the adapter 2322, and then transmitted to the battery management system.

[0138] The lead wire 2323 is used to transmit electrical signals or electrical energy between the temperature sensor 2321 and the adapter 2322 . A plurality of lead wires 2323 may be provided, and a plurality of lead wires 2323 means two or more.

[0139] For example, in some embodiments, Fig.12 As shown, the temperature sampling structure 232 includes two leads 2323 connected between the temperature sensor 2321 and the adapter 2322 .

[0140] It is understandable that the temperature sensor 2321 is arranged close to the bottom wall of the first receiving groove 23131, that is, the temperature sensor 2321 is as close as possible to the internal center of the battery cell 20, thereby helping the temperature sensor 2321 to more accurately measure the internal temperature of the battery cell 20. And based on the temperature sensor 2321 and the lead 2323 being installed in the first receiving groove 23131 and at least part of the adapter 2322 being installed in the second receiving groove 23132, the stability of the entire temperature sampling structure 232 can be enhanced, which helps to reduce the problem of loosening or falling off that may occur during use. At the same time, the adapter 2322 can cover the notch of the first receiving groove 23131, provide additional protection and support for the lead 2323 and the temperature sensor 2321, and reduce the interference of the external environment on the measurement.

[0141] It should be noted that if Fig.10 As shown, the distance between the bottom of the temperature sensor 2321 and the bottom wall of the first receiving groove 23131 is h1, and h1 satisfies: 0.3mm≤h1≤0.5mm.

[0142] Specifically, h1 can be 0.3 mm, 0.35 mm, 0.4 mm, 0.473 mm, 0.5 mm or other values ​​between 0.3 mm and 0.5 mm, which is not limited here.

[0143] The battery cell 20 provided in the embodiment of the present application, through the arrangement design of the above-mentioned temperature sensor 2321, adapter 2322 and lead 2323, allows the temperature sensor 2321 to penetrate as deeply into the interior of the battery cell 20 as possible, thereby helping to more appropriately mark the temperature conditions inside the battery cell 20, thereby maximizing the accuracy of temperature detection, and enhancing the stability of the entire temperature sampling structure 232, helping to reduce possible looseness during use. At the same time, the adapter 2322 provides additional protection and support for the lead 2323 and the temperature sensor 2321, reducing interference from the external environment on the measurement.

[0144] According to some embodiments of the present application, Fig.13 and Fig.14As shown, the adapter 2322 includes: a substrate, a first welding portion 23222 and a second welding portion 23224. The first welding portion 23222 is connected to the first surface of the substrate, the first welding portion 23222 is protruded relative to the first surface in a direction close to the temperature sensor 2321, and the first welding portion 23222 is used to be welded to the lead 2323; the second welding portion 23224 is connected to the second surface of the substrate, the second welding portion 23224 is protruded relative to the second surface in a direction away from the temperature sensor 2321, and the second welding portion 23224 is used to be welded to the sampling circuit board of the battery device 100, and the first welding portion 23222 is electrically connected to the second welding portion 23224, wherein the first surface and the second surface are arranged on opposite sides of the substrate.

[0145] Among them, the adapter 2322 can be made of plastic material combined with metal material. Specifically, the substrate can be made of plastic material, and the first welding part 23222 and the second welding part 23224 can be made of metal material. The first welding part 23222 and the second welding part 23224 can be set on the substrate by insert injection molding or other methods.

[0146] The first welding portion 23222 may be designed as a protruding pad structure. Specifically, the shape of the first welding portion 23222 may be cylindrical, prismatic, or other shapes, which are not limited here.

[0147] For example, in some embodiments, Fig.14 As shown, the shape of the first welding portion 23222 is cylindrical.

[0148] A plurality of first welding portions 23222 may be provided, where a plurality means two or more, and the plurality of first welding portions 23222 are spaced apart and distributed to reduce the risk of interference short circuit between them.

[0149] For example, in some embodiments, Fig.12 and Fig.14 As shown, two leads 2323 and first welding portions 23222 are provided in one-to-one correspondence, and the two leads 2323 are respectively connected to the positive and negative electrodes of the temperature sensor 2321 .

[0150] The second welding portion 23224 may be designed as a protruding pad structure. Specifically, the shape of the second welding portion 23224 may be cylindrical, prismatic, or other shapes, which are not limited here.

[0151] For example, in some embodiments, Fig.13 As shown, the second welding portion 23224 is cylindrical in shape.

[0152] A plurality of second welding portions 23224 may be provided, where a plurality means two or more, and the plurality of second welding portions 23224 are spaced apart and distributed to reduce the risk of interference short circuit between them.

[0153] For example, in some embodiments, Fig.13 As shown, two second welding portions 23224 are provided, and the two second welding portions 23224 are respectively connected to the positive and negative electrodes of the sampling circuit board.

[0154] like Fig.13 and Fig.14 As shown, the first surface is the inner surface of the substrate, that is, the side surface of the substrate close to the internal cell of the battery cell 20; the second surface is the outer surface of the substrate, that is, the side surface of the substrate away from the internal cell of the battery cell 20.

[0155] To achieve electrical connection between the first welding portion 23222 and the second welding portion 23224 , at least one of the first welding portion 23222 and the second welding portion 23224 may be disposed through the substrate, and the first welding portion 23222 and the second welding portion 23224 are in contact and tightly connected.

[0156] In some embodiments, the first welding portion 23222 and the second welding portion 23224 are each disposed through the substrate.

[0157] In other embodiments, the first welding portion 23222 passes through the substrate, and the second welding portion 23224 is only attached to the second surface.

[0158] In some other embodiments, the first welding portion 23222 is only attached to the first surface, and the second welding portion 23224 passes through the substrate.

[0159] In actual implementation, the lead 2323 can be partially bent. Specifically, the lead 2323 can be L-shaped. The bent portion of the lead 2323 is matched with the first welding portion 23222 and combined together by resistance welding or soldering, thereby realizing the electrical connection between the first welding portion 23222 and the temperature sensor 2321. The second welding portion 23224 is combined with the sampling circuit board by resistance welding or soldering. Based on the electrical connection between the sampling circuit board and the battery management system, the electrical connection between the second welding portion 23224 and the battery management system is realized. Since the first welding portion 23222 and the second welding portion 23224 are connected, the temperature sampling structure 232, the sampling circuit board and the battery pipeline system form a closed loop, thereby realizing the transmission of electrical signals between the temperature sampling structure 232, the sampling circuit board and the battery pipeline system.

[0160] The battery cell 20 provided in the embodiment of the present application provides structural support for the sampling circuit board to be connected to the temperature sensor 2321 through the adapter 2322 and the lead 2323 through the design of the above-mentioned protruding first welding portion 23222 and the second welding portion 23224, so that the electrical connection between the lead 2323 and the sampling circuit board is more firm and reliable, and the failure caused by poor connection is reduced. At the same time, the overall structure of the adapter 2322 is simplified as much as possible, and the volume of the adapter 2322 is reduced, so that the adapter 2322 can be compactly installed in the second accommodating groove 23132 to make full use of the limited space.

[0161] According to some embodiments of the present application, Fig.13 and Fig.14 As shown, the substrate includes a first transition section 23221 and a second transition section 23223 connected to each other, a first welding portion 23222 is provided on the first transition section 23221, a second welding portion 23224 is provided on the second transition section 23223, the first transition section 23221 is installed on the first accommodating groove 23131, and the second transition section 23223 is installed on the second accommodating groove 23132; wherein, the width of the first transition section 23221 is smaller than the width of the second transition section 23223, and the width of the first accommodating groove 23131 is smaller than the width of the second accommodating groove 23132.

[0162] The first transition section 23221 and the second transition section 23223 can be formed into a base plate by integral injection molding or other methods.

[0163] For example, Fig.13 and Fig.14 As shown, the first transition section 23221 is designed to be cylindrical, and two cylindrical first welding parts 23222 are arranged on opposite sides of the first surface of the first transition section 23221, and the outer circumferences of the two first welding parts 23222 can be tangent to the outer circumference of the first transition section 23221; the second transition section 23223 is also designed to be cylindrical, and two cylindrical second welding parts 23224 are arranged on opposite sides of the second surface of the second transition section 23223, and the outer circumferences of the two second welding parts 23224 can be tangent to the outer circumference of the second transition section 23223.

[0164] The first transition section 23221 and the second transition section 23223 can be concentrically arranged or eccentrically arranged, which is not limited here.

[0165] For example, in some embodiments, Fig.13 and Fig.14 As shown, the first transition section 23221 and the second transition section 23223 can be concentrically arranged.

[0166] In this embodiment, if Fig.13 and Fig.14As shown, the diameter of the first transition section 23221 is smaller than the diameter of the second transition section 23223. In order to match the sizes of the first transition section 23221 and the second transition section 23223, the width of the first accommodating groove 23131 can be designed to be smaller than the width of the second accommodating groove 23132. The first transition section 23221 can transitionally fit with the side wall of the first accommodating groove 23131, and the second transition section 23223 can transitionally fit with the side wall of the second accommodating groove 23132. In this case, the first transition section 23221 and the second transition section 23223 of different sizes can form a step surface, and the width of the first accommodating groove 23131 of different sizes is smaller than that of the second accommodating groove 23132, which can also form a step surface. The two step surfaces are matched and coupled, so that the second transition section 23223 can play a radial limiting role on the first transition section 23221, thereby enhancing the firmness and reliability of the assembly of the adapter 2322.

[0167] The battery cell 20 provided in the embodiment of the present application cleverly utilizes the size difference between the nail body 2311 and the nail cap 2312 through the size design of the above-mentioned first transition section 23221, the second transition section 23223, the first accommodating groove 23131, and the second accommodating groove 23132. The size of the second transition section 23223 and the second accommodating groove 23132 is designed to be as large as possible to provide sufficient connection area and stability. At the same time, the first accommodating groove 23131 and the first transition section 23221 are designed to be smaller to form a step limiting effect, thereby reducing the shaking and falling off of the adapter 2322, thereby improving the stability and reliability of the adapter 2322 in assembly.

[0168] According to some embodiments of the present application, Fig.10 As shown, the thickness h2 of the portion of the adapter 2322 located in the second receiving groove 23132 is smaller than the depth H2 of the second receiving groove 23132 .

[0169] It is understandable that if Fig.10 As shown, the thickness h2 of the second adapter section 23223 superimposed on the second solder pad is less than the depth H2 of the second receiving groove 23132. In other words, the height of the second surface of the adapter 2322 is lower than the notch height of the second receiving groove 23132. In this case, the second receiving groove 23132 not only plays the role of limiting the load, but also uses the height difference between h2 and H2 to protect the exposed second welding part 23224, and avoids the damage of the second welding part 23224 by the collision of the outside world as much as possible.

[0170] The battery cell 20 provided in the embodiment of the present application is designed such that the thickness h2 of the portion of the adapter 2322 located in the second receiving groove 23132 is less than the depth H2 of the second receiving groove 23132. Therefore, the second receiving groove 23132 not only plays a role in limiting the load, but also plays a role in protecting the exposed second welding portion 23224, thereby avoiding damage to the second welding portion 23224 caused by collision from the outside as much as possible, thereby increasing the stability and reliability of the electrical connection between the adapter 2322 and the sampling circuit board, and further reducing the maintenance frequency and maintenance cost.

[0171] According to some embodiments of the present application, Figure 8 As shown, the sealing nail 23 also includes: a sealing glue 233 .

[0172] The sealant 233 at least wraps the first welding portion 23222 , the lead wire 2323 and the temperature sensor 2321 .

[0173] The sealant 233 may include but is not limited to silicone sealant, polyurethane sealant or epoxy resin sealant, etc., which is not limited here.

[0174] In actual implementation, Figure 8 , Fig.10 , Fig.11 , Fig.13 and Fig.14 As shown, the relevant operating personnel can pour the fluid sealant 233 into the first receiving groove 23131, and then insert the temperature sampling structure 232 that has been assembled into one piece in advance into the receiving cavity 2313, wherein the lead 2323 and the temperature sensor 2321 are inserted into the first receiving groove 23131, the first transition section 23221 and the first welding part 23222 are inserted into the first receiving groove 23131, and the second transition section 23223 and the second welding part 23224 are inserted into the second receiving groove 23132. After the components are placed in the corresponding positions, the sealant 233 may partially overflow into the second receiving groove 23132. In this way, after the fluid sealant 233 solidifies, the sealant 233 can at least wrap the first welding part 23222, the lead 2323 and the temperature sensor 2321, and may overflow between the second transition section 23223 and the side wall and the bottom wall of the second receiving groove 23132.

[0175] It should be noted that, in order to achieve the best installation effect, during production and processing, the widths of the first transition section 23221 and the first receiving groove 23131 are matched as much as possible, and the widths of the second transition section 23223 and the second receiving groove 23132 are matched, so as to achieve a transition fit effect. However, in the actual production process, there may be certain errors that cause a gap between the first transition section 23221 and the first receiving groove 23131, and / or a gap between the second transition section 23223 and the second receiving groove 23132. After the sealant 233 is cured, it can also fill these gaps caused by processing errors.

[0176] The battery cell 20 provided in the embodiment of the present application, through the setting of the above-mentioned sealant 233, the sealant 233 can not only effectively wrap the temperature sensor 2321 and the lead 2323, but also simultaneously encapsulate and bond the first welding part 23222 and the adapter 2322, so that the charged first welding part 23222, the lead 2323 and the temperature sensor 2321 can be effectively protected, reducing the risk of external water vapor intrusion, thereby reducing the risk of short circuit.

[0177] According to some embodiments of the present application, Figure 7-10 As shown, the accommodating cavity 2313 also includes a third accommodating groove 23133 connected to the second accommodating groove 23132 on the side away from the first accommodating groove 23131, and the nail cap 2312 forms the third accommodating groove 23133; the sealing nail 23 also includes: a magnetic member 234, the magnetic member 234 is installed in the third accommodating groove 23133, and the magnetic member 234 is used to attract the sampling circuit board of the battery device 100.

[0178] The shape of the third receiving groove 23133 can be designed to be circular, triangular, square, pentagonal, hexagonal or other shapes, etc., which is not limited here.

[0179] For example, in some embodiments, Figure 7-Figure 11 As shown, the shape of the third receiving groove 23133 can be designed to be a pentagon.

[0180] The shape of the magnetic member 234 can be designed to be circular, triangular, square, pentagonal, hexagonal or other shapes, which are not limited here.

[0181] For example, in some embodiments, Figure 7-Figure 9 As shown, the shape of the third receiving groove 23133 can be designed to be a triangle.

[0182] The magnetic member 234 may be a small magnet or a magnetic patch, and the magnetic member 234 may be installed at a predetermined position of the third receiving slot 23133 by pasting, embedding, or screwing. The size and strength of the magnetic member 234 may be selected according to the weight and attraction requirements of the sampling circuit board.

[0183] In actual implementation, Figure 7-10 As shown, the third accommodating groove 23133 is designed to be a polygon, and a plurality of magnetic members 234 are provided, wherein a plurality means two or more, and the plurality of magnetic members 234 are respectively embedded in a plurality of intersecting triangular areas of the polygon by insert injection molding or other methods. When the sampling circuit board is connected to the second welding portion 23224, the plurality of magnetic members 234 can position and adsorb the sampling circuit board, so that the sampling circuit board can stably and reliably maintain a connection relationship with the second welding portion 23224, thereby reducing looseness or displacement caused by vibration or impact.

[0184] The battery cell 20 provided in the embodiment of the present application can attract the sampling circuit board through the above-mentioned magnetic part 234, which can simplify the assembly process and reduce the use of screws or other fasteners, thereby improving the assembly efficiency. On the other hand, the attraction force of the magnetic part 234 can make the sampling circuit board stably and reliably maintain connection with the second welding part 23224, reducing looseness or displacement caused by vibration or impact. On the other hand, when the sampling circuit board needs to be repaired or replaced, the sampling circuit board can be easily removed by overcoming the attraction force of the magnetic part 234, without the need to use tools to remove the fasteners, thereby simplifying the maintenance process.

[0185] According to some embodiments of the present application, Fig.10 As shown, the thickness h3 of the magnetic member 234 is less than the depth H3 of the third receiving groove 23133 .

[0186] It is understandable that if Fig.10 As shown, the height of the surface of the magnetic member 234 on the side away from the adapter 2322 is lower than the slot height of the third receiving groove 23133. In this case, the third receiving groove 23133 not only plays the role of limiting the load, but also uses the height difference between h3 and H3 to protect the exposed magnetic member 234, and avoids the damage of the magnetic member 234 by collision from the outside as much as possible.

[0187] The battery cell 20 provided in the embodiment of the present application is designed so that the thickness h3 of the magnetic part 234 is smaller than the depth H3 of the third receiving groove 23133. Therefore, the third receiving groove 23133 not only plays the role of limiting the load, but also plays the role of protecting the exposed magnetic part 234, thereby avoiding external collision damage to the magnetic part 234 as much as possible, thereby increasing the stability and reliability of the electrical connection between the adapter 2322 and the sampling circuit board, and further reducing the maintenance frequency and maintenance cost.

[0188] According to some embodiments of the present application, Fig. 9 and Fig.10 As shown, the magnetic member 234 is protruded inwardly and disposed on the side wall of the third receiving groove 23133 , and the orthographic projection of the magnetic member 234 along the axial direction of the sealing pin 23 does not overlap with the orthographic projection of the second receiving groove 23132 along the axial direction of the sealing pin 23 .

[0189] In this embodiment, if Fig. 9 and Fig.10 As shown, the bottom surface of the magnetic member 234 can be attached to the bottom wall of the third receiving groove 23133 .

[0190] In other embodiments, the bottom surface of the magnetic member 234 may also be spaced apart from the bottom wall of the third receiving groove 23133 .

[0191] It is understandable that if Fig. 9 and Fig.10 As shown, based on the fact that the orthographic projection of the magnetic member 234 along the axial direction of the sealing pin 23 does not overlap with the orthographic projection of the second receiving groove 23132 along the axial direction of the sealing pin 23, the magnetic member 234 does not protrude from the side wall of the third receiving groove 23133 to the extent of covering the notch of the second receiving groove 23132. Correspondingly, the width of the third receiving groove 23133 needs to be designed to be larger than the width of the second receiving groove 23132 to leave enough space for installing the magnetic member 234. In this way, during the installation process, the magnetic member 234 will not block or interfere with the temperature sampling structure 232, thereby reducing the wear and tear between the magnetic member 234 and the temperature sampling structure 232, thereby extending the service life of the magnetic member 234 and the temperature sampling structure 232.

[0192] The battery cell 20 provided in the embodiment of the present application avoids the situation where the magnetic member 234 blocks the notch of the second receiving groove 23132 through the layout design of the above-mentioned magnetic member 234. During the installation process, the magnetic member 234 will not cause blocking interference to the temperature sampling structure 232, thereby reducing the wear and damage between the magnetic member 234 and the temperature sampling structure 232, thereby extending the service life of the magnetic member 234 and the temperature sampling structure 232.

[0193] According to some embodiments of the present application, Figure 7 , Figure 8 and Fig.10 As shown, the sealing nail 23 has a threaded connection structure for connecting with the top cover 22, and the sealing nail 23 is provided with a sealing member 235 for sealingly cooperating with the injection hole.

[0194] The sealing member 235 may include but is not limited to a sealing ring or a sealing gasket, etc., which is not limited here.

[0195] In actual implementation, Figure 7 , Figure 8 and Fig.10 As shown, the sealing nail 23 can be made of non-metallic materials, such as plastic, and the top cover 22 can be provided with a groove for installing the nail cap 2312, and the groove can be located on the outside of the injection hole. The outer peripheral wall of the nail cap 2312 can have an external thread structure, and the inner wall of the groove can have an internal thread structure. The external thread structure on the nail cap 2312 cooperates with the internal thread structure of the groove to achieve a threaded connection between the nail cap 2312 and the top cover 22. The sealing member 235 can be sleeved on the outside of the nail body 2311. When the sealing nail 23 is assembled, the sealing member 235 can be in a compressed state to seal the gap between the injection hole and the main body 231.

[0196] The battery cell 20 provided in the embodiment of the present application adopts a threaded connection and an assembly design of a seal 235 between the above-mentioned main body 231 and the top cover 22. Under the premise of not affecting the locking force and the sealing effect, it can meet the demand for separate disassembly and maintenance of the sealing nail 23, thereby greatly increasing the convenience of after-sales maintenance.

[0197] According to some embodiments of the present application, the sealing pin 23 is connected to the top cover 22 by welding.

[0198] In actual implementation, the sealing nail 23 can be made of metal, and the top cover 22 can be provided with a groove for installing the nail cap 2312. The groove can be located outside the injection hole. After the nail cap 2312 is matched with the groove, fixed sealing can be achieved by laser welding.

[0199] The battery cell 20 provided in the embodiment of the present application maximizes the reliability and stability of the assembly of the sealing nail 23 through the design of welding connection between the sealing nail 23 and the top cover 22, and greatly reduces the risk of the sealing nail 23 falling off during long-term use.

[0200] According to some embodiments of the present application, referring to Figure 7 , and further refer to Figure 8 The present application also provides a sealing nail 23, which is applied to a battery cell 20, and the sealing nail 23 includes: a body 231 and a temperature sampling structure 232. The body 231 is used to be installed on the top cover 22 of the battery cell 20 and seal the injection hole of the top cover 22, and the body 231 forms a receiving cavity 2313; the temperature sampling structure 232 is installed in the receiving cavity 2313, and the temperature sampling structure 232 is suitable for being separated from the electrode assembly of the battery cell 20 by the body 231.

[0201] The sealing nail 23 provided in the embodiment of the present application integrates the temperature sampling structure 232 into the body 231 as described above. On the one hand, it realizes the temperature monitoring inside the battery cell 20, greatly improves the accuracy of temperature detection, and thus effectively improves the thermal management efficiency of the battery device 100. On the other hand, it realizes the high modularization of the body 231 and the temperature sampling structure 232, increases the overall integration and compactness of the battery cell 20, thereby improving the space utilization of the temperature sampling structure 232 and simplifying the assembly process of the temperature sampling structure 232, which helps to reduce production costs.

[0202] According to some embodiments of the present application, referring to Figure 4 The present application also provides a battery device 100, which includes: a battery management system, a sampling circuit board and a battery cell 20 as any one of the above, the sampling circuit board is electrically connected to the battery management system; the temperature sampling structure 232 of the battery cell 20 is electrically connected to the sampling circuit board.

[0203] The battery device 100 provided in the embodiment of the present application, through the configuration of the above-mentioned battery cell 20, on the one hand, realizes temperature monitoring inside the battery cell 20, greatly improves the accuracy of temperature detection, thereby effectively improving the thermal management efficiency of the battery device 100, and on the other hand, realizes high modularization of the body 231 and the temperature sampling structure 232, increases the overall integration and compactness of the battery cell 20, thereby improving the space utilization of the temperature sampling structure 232, and simplifying the assembly process of the temperature sampling structure 232, which helps to reduce production costs.

[0204] According to some embodiments of the present application, the present application also provides an energy storage device 1, which includes: multiple battery cells 20 as any one of the above or multiple battery devices 100 as any one of the above, the battery cells 20 or the battery devices 100 are used to store or provide electrical energy.

[0205] The energy storage device 1 provided in the embodiment of the present application, through the arrangement of the above-mentioned battery cell 20 or battery device 100, on the one hand, realizes temperature monitoring inside the battery cell 20, greatly improves the accuracy of temperature detection, thereby effectively improving the thermal management efficiency of the battery device 100, and on the other hand, realizes high modularization of the body 231 and the temperature sampling structure 232, increases the overall integration and compactness of the battery cell 20, thereby improving the space utilization of the temperature sampling structure 232, and simplifying the assembly process of the temperature sampling structure 232, which helps to reduce production costs.

[0206] According to some embodiments of the present application, referring to Figure 1The present application also provides an energy storage system, which includes: a power conversion device and the energy storage device 1 as described above, wherein the power conversion device is used to electrically connect the power generation device and the energy storage device 1.

[0207] The energy storage system provided in the embodiment of the present application, through the configuration of the above-mentioned energy storage device 1, on the one hand, realizes temperature monitoring inside the battery cell 20, greatly improves the accuracy of temperature detection, thereby effectively improving the thermal management efficiency of the battery device 100, and on the other hand, realizes high modularization of the main body 231 and the temperature sampling structure 232, increases the overall integration and compactness of the battery cell 20, thereby improving the space utilization of the temperature sampling structure 232, and simplifying the assembly process of the temperature sampling structure 232, which helps to reduce production costs.

[0208] According to some embodiments of the present application, referring to Figure 3 The present application also provides an electrical device, which includes: a battery cell 20 as any one of the above, a battery device 100 as described above, an energy storage device as described above, or an energy storage system as described above, wherein the battery cell 20 or the battery device 100 is used to store or provide electrical energy.

[0209] The electrical device provided in the embodiment of the present application, through the arrangement of the above-mentioned battery cell 20, battery device 100, energy storage device or energy storage system, on the one hand, realizes temperature monitoring inside the battery cell 20, greatly improves the accuracy of temperature detection, thereby effectively improving the thermal management efficiency of the battery device 100, and on the other hand, realizes high modularization of the main body 231 and the temperature sampling structure 232, increases the overall integration and compactness of the battery cell 20, thereby improving the space utilization of the temperature sampling structure 232, and simplifying the assembly process of the temperature sampling structure 232, which helps to reduce production costs.

[0210] According to some embodiments of the present application, referring to Figure 2 The present application also provides a charging network, which includes: a charging pile and the energy storage device 1 as described above or the energy storage system as described above, wherein the energy storage device 1 is used to provide electrical energy for the charging pile.

[0211] The charging network provided in the embodiment of the present application, through the configuration of the above-mentioned energy storage device 1 or energy storage system, on the one hand, realizes temperature monitoring inside the battery cell 20, greatly improves the accuracy of temperature detection, thereby effectively improving the thermal management efficiency of the battery device 100, and on the other hand, realizes high modularization of the main body 231 and the temperature sampling structure 232, increases the overall integration and compactness of the battery cell 20, thereby improving the space utilization of the temperature sampling structure 232, and simplifying the assembly process of the temperature sampling structure 232, which helps to reduce production costs.

[0212] According to some embodiments of the present application, see Figure 5-Figure 14As shown, the present application provides a battery cell 20, comprising: a shell 21, a top cover 22 and a sealing nail 23, wherein the top cover 22 is provided at the opening of the shell 21 and has a liquid injection hole, and the sealing nail 23 is installed on the top cover 22 for sealing the liquid injection hole; wherein the sealing nail 23 comprises: a body 231 and a temperature sampling structure 232, wherein the body 231 forms a receiving cavity 2313; the temperature sampling structure 232 is installed in the receiving cavity 2313, and the temperature sampling structure 232 is suitable for being separated from the electrode assembly of the battery cell 20 by the body 231. The receiving cavity 2313 comprises a first receiving groove 23131 and a second receiving groove 23132 which are connected; the body 231 comprises: a nail body 2311 and a nail cap 2312, wherein the nail body 2311 is used to be inserted into the liquid injection hole and forms the first receiving groove 23131; the nail cap 2312 is connected to the nail body 2311, connected to the top cover 22, and forms the second receiving groove 23132. The temperature sampling structure 232 includes: a temperature sensor 2321, an adapter 2322 and a lead 2323. The temperature sensor 2321 is installed in the first receiving groove 23131 and is arranged close to the bottom wall of the first receiving groove 23131. At least part of the adapter 2322 is installed in the second receiving groove 23132. The lead 2323 is installed in the first receiving groove 23131 and connected between the temperature sensor 2321 and the adapter 2322. The thickness of the portion of the adapter 2322 located in the second receiving groove 23132 is less than the depth of the second receiving groove 23132. The adapter 2322 includes: a substrate, a first welding portion 23222 and a second welding portion 23224, wherein the first welding portion 23222 is connected to the first surface of the substrate, protrudes relative to the first surface in a direction close to the temperature sensor 2321, and is used to be welded to the lead 2323; the second welding portion 23224 is connected to the second surface of the substrate, protrudes relative to the second surface in a direction away from the temperature sensor 2321, and is used to be welded to the sampling circuit board of the battery device 100, the first welding portion 23222 is electrically connected to the second welding portion 23224, wherein the first surface and the second surface are arranged on opposite sides of the substrate. The substrate includes a first transfer section 23221 and a second transfer section 23223 connected to each other, a first welding portion 23222 is provided on the first transfer section 23221, a second welding portion 23224 is provided on the second transfer section 23223, the first transfer section 23221 is installed on the first receiving groove 23131, and the second transfer section 23223 is installed on the second receiving groove 23132; wherein the width of the first transfer section 23221 is smaller than the width of the second transfer section 23223, and the width of the first receiving groove 23131 is smaller than the width of the second receiving groove 23132. The sealing pin 23 also includes: a sealant 233, and the sealant 233 at least wraps the first welding portion 23222, the lead wire 2323 and the temperature sensor 2321.The accommodating cavity 2313 also includes a third accommodating groove 23133 connected to the side of the second accommodating groove 23132 away from the first accommodating groove 23131, and the nail cap 2312 forms the third accommodating groove 23133; the sealing nail 23 also includes: a magnetic member 234, which is installed in the third accommodating groove 23133 and is used to attract the sampling circuit board of the battery device 100. The thickness of the magnetic member 234 is less than the depth of the third accommodating groove 23133. The magnetic member 234 protrudes inwardly and is arranged on the side wall of the third accommodating groove 23133, and the orthographic projection of the magnetic member 234 along the axial direction of the sealing nail 23 does not overlap with the orthographic projection of the second accommodating groove 23132 along the axial direction of the sealing nail 23. The sealing nail 23 has a threaded connection structure for connecting with the top cover 22, and is provided with a sealing member 235 for sealing with the injection hole.

[0213] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0214] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0215] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, applied to a battery device, characterized in that: include: A shell, a top cover and a sealing pin, wherein the top cover is arranged at the opening of the shell and has a liquid injection hole, and the sealing pin is installed on the top cover to seal the liquid injection hole; wherein the sealing pin comprises: A body, wherein the body forms a receiving cavity; A temperature sampling structure is installed in the accommodating cavity and is suitable for being separated from the electrode assembly of the battery cell by the body.

2. The battery cell according to claim 1, characterized in that: The accommodating cavity comprises a first accommodating groove and a second accommodating groove which are connected; the body comprises: A nail body, the nail body is used to be inserted into the injection hole and form a first receiving groove; A nail cap is connected to the nail body and the top cover to form a second receiving groove.

3. The battery cell according to claim 2, characterized in that: The temperature sampling structure comprises: A temperature sensor, the temperature sensor is installed in the first containing groove and is arranged close to the bottom wall of the first containing groove; A transfer member, at least a portion of which is mounted in the second receiving groove; A lead wire is installed in the first receiving groove and connected between the temperature sensor and the adapter.

4. The battery cell according to claim 3, characterized in that: The thickness of the portion of the adapter located in the second accommodating groove is smaller than the depth of the second accommodating groove.

5. The battery cell according to claim 3, characterized in that: The adapter comprises: substrate; A first welding portion, the first welding portion is connected to the first surface of the substrate, is protruded relative to the first surface in a direction close to the temperature sensor, and is used for welding and connecting with the lead wire; A second welding portion, the second welding portion is connected to the second surface of the substrate, protrudes relative to the second surface in a direction away from the temperature sensor, and is used for welding and connecting to the sampling circuit board of the battery device, the first welding portion is electrically connected to the second welding portion, wherein the first surface and the second surface are arranged on opposite sides of the substrate.

6. The battery cell according to claim 5, characterized in that: The substrate includes a first transition section and a second transition section that are connected, the first welding portion is arranged on the first transition section, the second welding portion is arranged on the second transition section, the first transition section is installed on the first accommodating groove, and the second transition section is installed on the second accommodating groove; wherein, the width of the first transition section is smaller than the width of the second transition section, and the width of the first accommodating groove is smaller than the width of the second accommodating groove.

7. The battery cell according to claim 5, characterized in that: The sealing nail also includes: A sealant is provided, wherein the sealant at least wraps the first welding portion, the lead wire and the temperature sensor.

8. The battery cell according to any one of claims 2 to 7, characterized in that: The accommodating cavity further includes a third accommodating groove connected to a side of the second accommodating groove away from the first accommodating groove, and the nail cap forms the third accommodating groove; the sealing nail further includes: A magnetic member is installed in the third receiving groove and is used for attracting the sampling circuit board of the battery device.

9. The battery cell according to claim 8, characterized in that: The thickness of the magnetic member is smaller than the depth of the third receiving groove.

10. The battery cell according to claim 8, characterized in that: The magnetic member is protruding inwardly and is disposed on a side wall of the third receiving groove, and an orthographic projection of the magnetic member along the axial direction of the sealing pin does not overlap with an orthographic projection of the second receiving groove along the axial direction of the sealing pin.

11. The battery cell according to any one of claims 1 to 7, characterized in that: The sealing nail has a threaded connection structure for connecting with the top cover, and is provided with a sealing member for sealingly cooperating with the injection hole.

12. A sealing nail, used in a battery cell, characterized in that: include: A body, the body being used to be mounted on the top cover of the battery cell and to seal the injection hole of the top cover, the body forming a receiving cavity; A temperature sampling structure is installed in the accommodating cavity and is suitable for being separated from the electrode assembly of the battery cell by the body.

13. A battery device, characterized in that: include: A battery management system and a sampling circuit board, wherein the sampling circuit board is electrically connected to the battery management system; According to any one of claims 1 to 11, the temperature sampling structure of the battery cell is electrically connected to the sampling circuit board.

14. An energy storage device, characterized in that: include: A plurality of battery cells according to any one of claims 1 to 11 or a plurality of battery devices according to claim 13, wherein the battery cells or the battery devices are used to store or provide electrical energy.

15. An energy storage system, characterized in that: include: A power conversion device and an energy storage device as claimed in claim 14, wherein the power conversion device is used to electrically connect a power generation device and the energy storage device.

16. An electrical device, characterized in that: include: The battery cell according to any one of claims 1 to 11, the battery device according to claim 13, the energy storage device according to claim 14 or the energy storage system according to claim 15, wherein the battery cell or the battery device is used to store or provide electrical energy.

17. A charging network, characterized in that: include: A charging pile and an energy storage device as claimed in claim 14 or an energy storage system as claimed in claim 15, wherein the energy storage device is used to provide electrical energy to the charging pile.

Images