Battery cell, battery and electric device

Abstract

A battery cell, a battery and an electric device. The battery cell comprises: a casing which comprises a wall part, wherein a mounting hole for connecting the interior and exterior of the casing is formed in the wall part; a sampling assembly, which is accommodated in the casing; and a plurality of connecting parts, which are in insulated connection, the plurality of connecting parts being arranged in the mounting hole and blocking the mounting hole, and all being electrically connected to the sampling assembly. In this way, the number of holes in the casing of the battery cell can be reduced, thereby improving the strength of the casing, and reducing the failure risk of the structural strength of the casing; in addition, the process can be simplified, and the cost is saved on; furthermore, the space occupied by the holes can also be reduced, thereby improving the compactness of the structure.

Description

Battery cells, batteries and electrical devices

[0001] This application claims priority to Chinese patent application No. 2023217073004, filed on July 3, 2023, entitled “Battery Cell, Battery and Electrical Device,” which is incorporated herein by reference in its entirety. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to battery cells, batteries, and electrical devices. Background Art

[0003] With the advancement of battery technology, battery cells are being used in a growing number of fields and are gradually replacing traditional fossil fuels in the automotive powertrain sector. Battery cells store chemical energy and controllably convert it into electrical energy. In recyclable battery cells, after discharge, the active material can be activated by recharging for continued use.

[0004] Generally, a battery cell includes a housing and an electrode assembly, a sampling assembly, etc. housed within the housing. The electrode assembly is electrically connected to the outside world via an electrode post, and the sampling assembly is electrically connected to the outside world via a connecting post. In the structure of existing battery cells, the sampling assembly typically includes one or more connecting posts, and when there are multiple sampling assemblies, the number of connecting posts also increases accordingly. To facilitate the installation of the connecting posts, multiple mounting holes are typically provided on the housing so that the connecting posts can be electrically connected to the outside world by correspondingly installing the multiple connecting posts at the multiple mounting holes. However, this structure increases the risk of structural strength failure of the battery cell.

[0005] Summary of the Invention

[0006] In view of the above problems, the present application provides a battery cell, a battery and an electrical device, which can reduce the number of openings on the outer shell of the battery cell to improve its strength, reduce the risk of structural strength failure, and simplify the process and save costs; further, it can also reduce the space occupied by the openings and improve the compactness of the structure.

[0007] In a first aspect, the present application provides a battery cell, which includes at least: a shell, including a wall portion, the wall portion having a mounting hole connecting the interior and exterior of the shell; a sampling assembly, accommodated inside the shell; and a plurality of insulatingly connected connection portions, which are arranged in the mounting hole and seal the mounting hole, and the plurality of connection portions are electrically connected to the sampling assembly.

[0008] Through the above-described method, multiple insulating connection portions that seal the mounting holes can be installed through the same mounting hole on the housing. That is, multiple insulating connection portions can be installed through a single mounting hole, thereby reducing the number of mounting holes on the housing. On the one hand, since the strength of the housing decreases as the number of mounting holes increases, the above-described structure can increase the strength of the housing and reduce the risk of structural strength failure of the battery cell. On the other hand, since the sealing performance of the housing also decreases as the number of mounting holes increases, the above-described structure can also improve the sealing performance of the housing. On the other hand, since the connecting column corresponding to each mounting hole needs to be installed in the corresponding mounting hole, that is, it needs to be fixedly connected to the housing, the increase in the number of mounting holes also increases the complexity of the battery cell manufacturing process. For example, it is necessary to machine a stepped surface on the housing for each mounting hole, which is costly. Therefore, the above-described structure can also reduce the complexity of the battery cell manufacturing process and save costs. Furthermore, by integrating the multiple insulating connection portions into the same mounting hole, compared to providing separate mounting holes without connecting portions, the area occupied by the mounting holes on the housing can be reduced, thereby improving the compactness of the structure.

[0009] In some embodiments, the multiple connecting portions include a first connecting portion arranged along a predetermined axis and a second connecting portion circumferentially surrounding at least a portion of the first connecting portion. By arranging the first connecting portion along the predetermined axis, the area occupied by the multiple connecting portions of the insulating connection on the wall portion can be reduced, thereby reducing the opening area of ​​the mounting hole, thereby improving the strength and sealing performance of the wall portion. Furthermore, by arranging the second connecting portion around at least a portion of the periphery of the first connecting portion, the arrangement area between the second connecting portion and the first connecting portion can be reduced, thereby further reducing the opening area of ​​the mounting hole, further improving the strength and sealing performance of the wall portion, and improving the compactness of the structure.

[0010] In some embodiments, the second connection portion surrounds the outer periphery of the first connection portion. This can further reduce the area occupied by the second and first connection portions on the wall, thereby reducing the opening area of ​​the mounting hole, thereby improving the strength and sealing performance of the wall, and enhancing the compactness of the structure. Furthermore, the size of the second connection portion can be increased, thereby improving electrical performance.

[0011] In some embodiments, there are at least two second connection portions, and the at least two second connection portions are spaced apart along the circumference of the first connection portion. This arrangement allows for at least three connection portions, and the second connection portions are disposed around at least a portion of the outer circumference of the first connection portion, thereby reducing the arrangement area between the second connection portions and the first connection portion, thereby further reducing the opening area of ​​the mounting hole, thereby further improving the strength and sealing performance of the wall portion, and enhancing the compactness of the structure.

[0012] In some embodiments, the connecting portion is partially disposed around a predetermined axis, and the multiple connecting portions are spaced apart from each other along the circumference of the predetermined axis. This allows the multiple connecting portions to be located on the same outer circumference outside the predetermined axis, thereby reducing the area occupied by the multiple connecting portions on the wall, thereby reducing the opening area of ​​the mounting hole, improving the strength and sealing performance of the housing, and enhancing the compactness of the structure.

[0013] In some embodiments, the battery cell further includes an insulating member disposed between the plurality of connecting portions. The insulating member is disposed between adjacent connecting portions to reduce interference between the plurality of connecting portions, such as electrical signal interference, thereby improving the reliability of the battery cell.

[0014] In some embodiments, the battery cell further includes a fixing member, the connecting portion is fixed to the fixing member, and the fixing member is fixed to the wall portion. The fixing member connects the connecting portion to the wall portion, thereby improving the stability between the connecting portion and the wall portion and reducing the risk of damage to the connecting portion during the installation process.

[0015] In some embodiments, the fixing member is fixed to the outer periphery of the connecting portion at least partially along the circumference of the connecting portion. Disposing the fixing member on the outer periphery of the connecting portion facilitates positioning the fixing member between the inner wall of the mounting hole and the connecting portion, so that the fixing member is located within the mounting hole. This not only increases the connection stability between the inner wall of the mounting hole and the connecting portion, but also reduces interference of the fixing member with internal or external structures of the housing.

[0016] In some embodiments, the mounting hole includes a first hole segment and a second hole segment that communicate with each other, the first hole segment communicating with the exterior of the housing, and the second hole segment communicating with the interior of the housing. A stepped surface facing the exterior of the housing is formed at the junction of the first and second hole segments, and the fixing member is supported on the stepped surface. The stepped surface can limit movement of the fixing member toward the interior of the housing. The first and second hole segments can limit the range of radial movement of the fixing member along the mounting hole, facilitating installation of the fixing member and maintaining structural stability of the fixing member after installation.

[0017] In some embodiments, the fixing member includes a fixing section and an insertion section arranged along a predetermined axis. The insertion section is disposed within the second hole section, and the fixing section is disposed within the first hole section and supported on a stepped surface. The stepped surface can restrict movement of the fixing section toward the interior of the housing. The second hole section can restrict the radial movement range of the fixing section along the mounting hole, and the first hole section can restrict the radial movement range of the insertion section along the mounting hole, thereby facilitating installation of the fixing member.

[0018] In some embodiments, the battery cell further includes: a sealing ring disposed between the fixing section and the step surface to improve the sealing performance between the fixing section and the step surface, thereby improving the reliability of the battery cell.

[0019] In some embodiments, the housing includes a shell and an end cap, wherein the shell has an open end, the end cap is disposed over the open end, and the sampling assembly is housed within the shell; the end cap forms a wall portion; and the mounting hole is disposed in the end cap. Disposing the mounting hole in the end cap facilitates blocking the mounting hole.

[0020] In some embodiments, the sampling assembly includes multiple sampling modules, each sampling module is connected to at least one connection part, and the environmental information inside the shell can be obtained through the sampling modules to improve the effectiveness of managing the working status of the battery cell, thereby improving the working stability of the battery cell.

[0021] In some embodiments, the battery cell further comprises a circuit board disposed outside the housing and electrically connected to the connection portion. The circuit board disposed outside the housing and electrically connected to the connection portion processes environmental information acquired by the sampling assembly to determine gas composition and concentration, temperature, or pressure within the housing, thereby analyzing the operating status of the battery cell.

[0022] In some embodiments, the circuit board is positioned on the side of the wall facing away from the sampling assembly. This placement of the circuit board on the side of the wall facing away from the sampling assembly, i.e., on the exterior of the housing, facilitates installation and removal of the circuit board. The wall prevents the circuit board from contacting the electrode assembly and electrolyte, reducing the risk of short circuits caused by contact with the electrode assembly and the electrolyte, while also minimizing corrosion of the circuit board by the electrode assembly and electrolyte.

[0023] Secondly, the present application provides a battery comprising the aforementioned battery cell. This arrangement can reduce the number of openings in the battery cell housing, thereby improving its strength and reducing the risk of structural failure. It can also simplify the process and save costs. Furthermore, it can reduce the space occupied by the openings, improving the compactness of the structure.

[0024] In some embodiments, the battery further comprises: a battery management unit electrically connected to the connection portion, wherein the battery management unit is electrically connected to the connection portion so that the battery management unit automatically manages the battery cells according to the environmental information obtained by the sampling component.

[0025] In some embodiments, the battery further comprises: a housing in which the battery cells are disposed; and a circuit board disposed outside the housing and electrically connected to the connection portion. The circuit board disposed within the housing and electrically connected to the connection portion processes environmental information acquired by the sampling assembly to determine the gas composition and concentration, temperature, or pressure within the housing, thereby analyzing the operating status of the battery cells.

[0026] Thirdly, the present application provides an electrical device comprising the aforementioned battery. This configuration can reduce the number of openings in the battery cell housing, thereby improving its strength and reducing the risk of structural failure. It can also simplify the process and save costs. Furthermore, it can reduce the space occupied by the openings, improving the compactness of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0028] FIG1 is a schematic structural diagram of a vehicle according to one or more embodiments;

[0029] FIG2 is a schematic diagram of an exploded structure of a battery according to one or more embodiments;

[0030] FIG3 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments;

[0031] FIG4 is a schematic block diagram of the structure of a battery cell according to one or more embodiments;

[0032] FIG5 is a schematic structural diagram of the wall portion, electrode column, connection portion, and plastic part of the battery cell shown in FIG3 ;

[0033] FIG6 is a schematic diagram of a top view of the structure shown in FIG5 ;

[0034] FIG7 is a schematic diagram of a partial structure of a cross section of the structure shown in FIG6 along the AA cutting line;

[0035] FIG8 is an enlarged schematic diagram of the structure B in the structure shown in FIG7 ;

[0036] FIG9 is another schematic structural diagram of a battery cell according to one or more embodiments;

[0037] FIG10 is another schematic structural diagram of a battery cell according to one or more embodiments;

[0038] FIG. 11 is another schematic structural diagram of a battery cell according to one or more embodiments.

[0039] The accompanying drawings in the specific implementation manner are as follows:

[0040] 1000a vehicles;

[0041] 100a battery; 200a controller; 300a motor;

[0042] 10a housing; 11a first part; 12a second part;

[0043] 1 Battery cell; 100 Housing; 101 Wall; 102 Mounting hole; 142 First hole section; 122 Second hole section; 132 Step surface; 110 Housing; 111 Open end; 112 Opening; 120 End cap; 152 Sealing ring; 200 Electrode assembly; 201 Tab; 300 Circuit board; 400 Sampling assembly; 500 Fixing member; 600 Plastic member; 700 Connecting portion; 707 Insulating substrate; 710 First connecting portion; 720 Second connecting portion; 800 Insulating member; 900 Electrode column; F Preset axis. DETAILED DESCRIPTION

[0044] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0046] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly indicate the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is two or more, unless otherwise specifically defined.

[0047] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0048] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0049] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0050] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0051] With the advancement of battery technology, battery cells are being used in a growing number of fields and are gradually replacing traditional fossil fuels in the automotive powertrain sector. Battery cells store chemical energy and controllably convert it into electrical energy. In recyclable battery cells, after discharge, the active material can be activated by recharging for continued use.

[0052] Generally, a battery cell includes a shell and an electrode assembly, a sampling assembly, etc. housed in the shell. The electrode assembly is electrically connected to the outside world through an electrode column, and the sampling assembly is electrically connected to the outside world through a connecting column. In the structure of existing battery cells, the sampling assembly usually includes one or more connecting columns, and when the number of sampling assemblies is multiple, the number of connecting columns also increases. In order to facilitate the installation of the connecting columns, a plurality of mounting holes are usually provided on the shell, so that the connecting columns can be electrically connected to the outside world by correspondingly installing the plurality of connecting columns at the plurality of mounting holes. However, on the one hand, the strength of the shell will decrease as the number of mounting holes increases, and as the number of mounting holes increases, the risk of structural strength failure of the battery cell will increase; on the other hand, the sealing performance of the shell will also decrease as the number of mounting holes increases; on the other hand, because the connecting column corresponding to each mounting hole needs to be installed in the corresponding mounting hole, that is, it needs to be fixedly connected to the shell, as the number of mounting holes increases, the complexity of the battery cell process will also increase, and the cost will be higher.

[0053] Furthermore, during the use of battery cells, especially during the use of secondary batteries, they undergo multiple charge and discharge cycles, and side reactions occur. Gas will continue to be generated inside the battery cells, or the electrode assembly inside the casing will expand, causing a certain air pressure inside the casing, which will further increase the risk of structural strength failure of the battery cells.

[0054] Based on the above considerations, the present application provides a battery cell, a battery, and an electrical device. Among them, the battery cell includes a shell, including a wall portion, the wall portion is provided with a mounting hole connecting the inside and outside of the shell; a sampling assembly is accommodated inside the shell; a plurality of insulating connection parts are arranged in the mounting hole and block the mounting hole, and the plurality of connection parts are electrically connected to the sampling assembly. In this way, the plurality of insulating connection parts that block the mounting hole can be installed through the same mounting hole on the shell, that is, the installation of the plurality of insulating connection parts can be achieved through one mounting hole, which can reduce the number of mounting holes on the shell, thereby reducing the risk of structural strength failure of the battery cell, improving the sealing performance of the shell, and reducing the process complexity of the battery cell, saving costs, and also improving the compactness of the structure.

[0055] The battery cells, batteries, and electrical devices disclosed in the embodiments of the present application can be used in electrical devices that use batteries as power sources or various energy storage systems that use batteries as energy storage elements. The electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, battery-powered vehicles, electric vehicles, ships, spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like, and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, and the like.

[0056] For the convenience of description, the following embodiments are described by taking a vehicle 1000a as an example of an electrical device according to an embodiment of the present application.

[0057] Referring to Figure 1, vehicle 1000a can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100a is provided inside vehicle 1000a. Battery 100a can be provided at the bottom, head, or tail of vehicle 1000a. Battery 100a can be used to power vehicle 1000a. For example, battery 100a can serve as an operating power source for vehicle 1000a. Vehicle 1000a can also include a controller 200a and a motor 300a. Controller 200a is used to control battery 100a to power motor 300a, for example, to meet the power requirements for starting, navigating, and driving the vehicle 1000a.

[0058] In some embodiments of the present application, the battery 100a can serve not only as an operating power source for the vehicle 1000a, but also as a driving power source for the vehicle 1000a, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000a.

[0059] In some embodiments, the battery 100a may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0060] The battery 100 a mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 1 to provide higher voltage and capacity.

[0061] In the embodiment of the present application, the battery cell 1 may be a secondary battery, which refers to a battery cell 1 that can be recharged to activate the active material after discharge and continue to be used. Each battery cell 1 may also be a primary battery.

[0062] The battery cell 1 includes, but is not limited to, 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-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc. The battery cell 1 may be cylindrical, flat, rectangular, or have other shapes.

[0063] In some embodiments, the battery 100 a may be a battery module. When there are multiple battery cells 1 , the multiple battery cells 1 are arranged and fixed to form a battery module.

[0064] In some embodiments, referring to FIG. 2 , the battery 100 a may be a battery pack, which includes a housing 10 a and battery cells 1 . The battery cells 1 or battery modules are housed in the housing 10 a .

[0065] In some embodiments, the box 10a can serve as part of the chassis structure of the vehicle 1000a. For example, a portion of the box 10a can become at least a portion of the floor of the vehicle 1000a, or a portion of the box 10a can become at least a portion of the cross member and longitudinal member of the vehicle 1000a.

[0066] Referring to Figure 2, the battery 100a includes a housing 10a and a battery cell 1, and the battery cell 1 is accommodated in the housing 10a. The housing 10a is used to provide a storage space for the battery cell 1, and the housing 10a can adopt a variety of structures. In some embodiments, the housing 10a can include a first portion 11a and a second portion 12a, and the first portion 11a and the second portion 12a cover each other, and the first portion 11a and the second portion 12a jointly define a storage space for accommodating the battery cell 1. The second portion 12a can be a hollow structure with one end open, and the first portion 11a can be a plate-like structure, and the first portion 11a covers the open side of the second portion 12a, so that the first portion 11a and the second portion 12a jointly define a storage space; the first portion 11a and the second portion 12a can also be hollow structures with one side open, and the open side of the first portion 11a covers the open side of the second portion 12a. Of course, the box body 10a formed by the first part 11a and the second part 12a can be in various shapes, such as a cylinder, a cuboid, etc.

[0067] In battery 100a, there may be multiple battery cells 1, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the battery cells 1. Multiple battery cells 1 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery cell 1 may be housed within the housing 10a. Alternatively, battery 100a may comprise multiple battery cells 1 connected in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single unit housed within the housing 10a. Battery 100a may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 1.

[0068] Referring to Figure 3 , a battery cell 1 is the smallest unit of a battery. In this embodiment, a cylindrical battery cell 1 is used as an example. As shown in Figure 3 , the battery cell 1 includes a housing 100 , an electrode assembly 200 , and other functional components.

[0069] In some embodiments, the housing 100 is used to encapsulate the electrode assembly 200 and the electrolyte and other components. The housing 100 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film.

[0070] The outer shell 100 may include an end cap 120 and a shell 110. The end cap 120 refers to a component that covers the opening of the shell 110 to isolate the internal environment of the battery cell 1 from the external environment. Without limitation, the shape of the end cap 120 can be adapted to the shape of the shell 110 to match the shell 110. Optionally, the end cap 120 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 120 is not easily deformed when squeezed or collided, so that the battery cell 1 can have a higher structural strength and improved safety performance. Functional components such as electrode columns 900 can be provided on the end cap 120. The electrode column 900 can be used to electrically connect to the electrode assembly 200 for outputting or inputting electrical energy of the battery cell 1. In some embodiments, the end cap 120 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold. The end cap 120 may be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic. In some embodiments, an insulating component may be disposed inside the end cap 120 to isolate the electrical connection components within the housing 110 from the end cap 120 to reduce the risk of short circuits. Exemplary materials include plastic, rubber, and the like.

[0071] The housing 110 is a component that cooperates with the end cap 120 to form the internal environment of the battery cell 1. This internal environment can be used to accommodate the electrode assembly 200, electrolyte, and other components. The housing 110 and end cap 120 can be separate components. An opening 112 can be provided in the housing 110, and the end cap 120 is placed over the opening 112 to form the internal environment of the battery cell 1. Alternatively, the end cap 120 and housing 110 can be integrated. Specifically, the end cap 120 and housing 110 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 110 is to be enclosed, the end cap 120 is placed over the housing 110. The housing 110 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylinder, or a hexagonal prism. Specifically, the shape of the housing 110 can be determined based on the specific shape and size of the electrode assembly 200. The housing 110 can be made of a variety of materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0072] The electrode assembly 200 is a component where electrochemical reactions occur in the battery cell 1. One or more electrode assemblies 200 may be contained in the housing 110.

[0073] In some embodiments, the electrode assembly 200 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 1, active ions (e.g., lithium ions) are intercalated and released between the positive and negative electrodes. The separator is positioned between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0074] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0075] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0076] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0077] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0078] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0079] As an example, the negative electrode current collector can be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium can be used. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0080] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0081] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0082] As an example, the negative electrode active material may adopt the negative electrode active material for battery cell 1 that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0083] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0084] In some embodiments, the electrode assembly 200 further includes a separator disposed between the positive electrode and the negative electrode.

[0085] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0086] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0087] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0088] In some embodiments, the battery cell 1 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte may be selected based on needs. The electrolyte may be liquid, gel, or solid.

[0089] The liquid electrolyte includes an electrolyte salt and a solvent.

[0090] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0091] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be an ether solvent. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0092] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0093] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0094] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0095] As an example, the inorganic solid electrolyte can be an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0096] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0097] In some embodiments, the electrode assembly 200 is a wound structure in which the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0098] In some embodiments, the electrode assembly 200 is provided with tabs 201 that conduct current from the electrode assembly 200. Tabs include positive and negative tabs. The positive and negative tabs can be located together at one end of the main body or separately at opposite ends of the main body. During the charge and discharge process of the battery 100a, the positive and negative active materials react with the electrolyte, and the tabs 201 connect to the electrode column 900 to form a current loop.

[0099] According to some embodiments of the present application, as shown in Figures 3 to 8 , the battery cell 1 described in the embodiment of the present application includes a housing 100, a sampling assembly 400, and multiple insulated connection portions 700. The housing 100 includes a wall 101, which defines a mounting hole 102 that connects the interior and exterior of the housing 100. The sampling assembly 400 is housed within the housing 100. The multiple insulated connection portions 700 are disposed within the mounting hole 102 and seal the mounting hole 102. Each of the multiple connection portions 700 is electrically connected to the sampling assembly 400.

[0100] Specifically, multiple connectors 700 are integrated to seal the mounting hole 102 directly or through an insulating member. The connectors 700 extend axially along the mounting hole 102 to connect the sampling assembly 400 disposed within the housing 100 and enable electrical transmission between the sampling assembly 400 and devices outside the housing 100.

[0101] The connection portion 700 refers to a component or structural portion used to achieve electrical connection, and the connection portion 700 may include a conductive portion such as a metal portion.

[0102] The size, shape and number of the connecting portion 700 can be set according to the size, electrical parameters and other requirements of the sampling assembly 400 and the battery cell 1 .

[0103] Optionally, the outer contour shape of the multiple connecting parts 700 of the insulating connection or the outer contour shape of the insulating member outside thereof matches the shape of the mounting hole 102, so that the mounting hole 102 is used to install and position the multiple connecting parts 700 of the insulating connection.

[0104] The sampling component 400 is used to obtain environmental information inside the housing 100 and generate an electrical signal based on the environmental information. The electrical signal is transmitted to a device outside the housing 100 through the connection portion 700 .

[0105] Through the above-described method, multiple insulating connection portions 700 that block the mounting holes 102 can be installed through the same mounting hole 102 on the housing 100. That is, multiple insulating connection portions 700 can be installed through a single mounting hole 102, thereby reducing the number of mounting holes 102 on the housing. On the one hand, since the strength of the housing 100 decreases as the number of mounting holes 102 increases, the above-described structure can increase the strength of the housing 100 and reduce the risk of structural strength failure of the battery cell 1. On the other hand, since the sealing performance of the housing 100 also decreases as the number of mounting holes 102 increases, the above-described structure can also improve the sealing performance of the housing 100. On the other hand, since the connecting post corresponding to each mounting hole needs to be installed in the corresponding mounting hole, that is, it needs to be fixedly connected to the housing, the increase in the number of mounting holes 102 will also increase the complexity of the battery cell 1 manufacturing process. For example, it is necessary to process a stepped surface on the housing 100 for each mounting hole 102, which is costly. Therefore, the above-described structure can also reduce the complexity of the battery cell 1 manufacturing process and save costs. Furthermore, by integrating the multiple connecting parts 700 of the insulated connection into the same mounting hole 102, compared with providing an independent mounting hole 102 without the connecting part 700, the area occupied by the mounting hole 102 on the housing can be reduced, thereby improving the compactness of the structure.

[0106] Of course, the battery cell 1 further includes an electrode assembly 200 , which is accommodated in the housing 100 . Detailed descriptions can be found above.

[0107] In some embodiments, the plurality of connection portions 700 include a first connection portion 710 disposed along a predetermined axis F and a second connection portion 720 surrounding at least a portion of the outer periphery of the first connection portion 710 along a circumferential direction of the first connection portion 710 .

[0108] Specifically, "arranged along the preset axis F" means extending along the preset axis F, i.e., the axis of the first connecting portion 710 coincides with or is parallel to the preset axis F, and the preset axis F passes through the interior of the first connecting portion 710. The preset axis F is the axis of the connector formed by the integrated arrangement of multiple connecting portions 700, which can be arranged in a cylindrical shape or other shape. When the connecting portion 700 is arranged perpendicular to the wall portion 101, the preset axis F can also be the axis of the mounting hole 102. The circumferential direction of the preset axis F refers to the direction perpendicular to and surrounding the preset axis F.

[0109] By arranging the first connection part 710 along the preset axis F, the occupied area of ​​the multiple connection parts 700 of the insulation connection on the wall part 101 can be reduced, thereby reducing the opening area of ​​the mounting hole 102, and further improving the strength and sealing performance of the wall part 101; and by arranging the second connection part 720 around at least part of the periphery of the first connection part 710, the arrangement area between the second connection part 720 and the first connection part 710 can be reduced, thereby further reducing the opening area of ​​the mounting hole 102, and further improving the strength and sealing performance of the wall part 101; and the compactness of the structure can be improved.

[0110] The number of second connection parts can be set according to the structural requirements and performance requirements of the sampling component 400 inside the shell 100, and the specific position and size of the second connection part can be set according to the structural requirements and performance requirements of the sampling component 400, the opening area of ​​the mounting hole 102, etc.

[0111] In some embodiments, the second connection portion 720 is closed around the outer periphery of the first connection portion 710 .

[0112] By enclosing the second connecting portion 720 around the outer periphery of the first connecting portion 710 and sleeved around the outer periphery of the first connecting portion 710, the area occupied by the second connecting portion 720 and the first connecting portion 710 on the wall 101 can be further reduced, thereby reducing the opening area of ​​the mounting hole 102, thereby improving the strength and sealing performance of the wall 101 and enhancing the compactness of the structure. Furthermore, the size of the second connecting portion 720 can be increased, thereby improving electrical performance.

[0113] In some embodiments, as shown in FIG. 9 , the number of the second connection portions 720 is at least two, and the at least two second connection portions 720 are spaced apart along the circumference of the first connection portion 710 .

[0114] Through the above method, at least three connecting parts 700 can be realized, and the second connecting part 720 is arranged around at least part of the periphery of the first connecting part 710, which can reduce the arrangement area between the second connecting part 720 and the first connecting part 710, thereby further reducing the opening area of ​​the mounting hole 102, thereby further improving the strength and sealing performance of the wall part 101, and improving the compactness of the structure.

[0115] For example, the first connection portion 710 is disposed on a preset axis F, and the two second connection portions 720 are spaced apart along the circumference of the first connection portion 710 .

[0116] The embodiment of the present application does not limit the size and uniformity of the arrangement of the plurality of second connection portions 720 .

[0117] In other embodiments, the number of the second connection parts may be three or more, and they may be located on the same outer periphery of the first connection part, or on multiple different outer peripheries of the first connection part.

[0118] The plurality of second connection portions being located on the same outer circumference means that the plurality of second connection portions are at equal distances from the first connection portion.

[0119] In some embodiments, as shown in FIG. 10 , the connection portion 700 is partially disposed around the predetermined axis F, and a plurality of connection portions 700 are spaced apart from each other along the circumference of the predetermined axis F.

[0120] The connection portion 700 is partially arranged around the preset axis F, and the multiple connection portions 700 are spaced apart from each other along the circumference of the preset axis F, so that the multiple connection portions 700 are located on the same outer circumference of the preset axis F, which can reduce the occupied area of ​​the multiple connection portions 700 on the wall portion 101, thereby reducing the opening area of ​​the mounting hole 702, improving the strength and sealing performance of the housing 100, and improving the compactness of the structure.

[0121] In other embodiments, a plurality of circumferentially arranged connection portions may be located on the outer circumference of the same circle, or on the outer circumferences of different circles, or partially on the outer circumference of the same circle.

[0122] In some embodiments, as shown in FIG. 3 to FIG. 10 , the battery cell 1 further includes an insulating member 800 , which is disposed between the plurality of connecting portions 700 .

[0123] An insulating member 800 is provided between adjacent connecting portions 700 to improve interference between the connecting portions 700 , such as electrical signal interference, and thereby improve the reliability of the battery cell 1 .

[0124] The insulating member 800 may include a plastic member, etc. Plastic material facilitates the molding of the plastic member. Alternatively, the insulating member 800 may include an insulating member with better heat dissipation, such as ceramic.

[0125] In some embodiments, the connecting portion 700 and the insulating member 800 are integrally molded. This improves the connection stability between the connecting portion 700 and the insulating member 800, thereby improving the reliability of the battery cell 1 and simplifying the installation process between the connecting portion 700 and the insulating member 800, further reducing the process complexity of the battery cell 1.

[0126] In some embodiments, as shown in FIG. 3 to FIG. 8 , the battery cell 1 further includes a fixing member 500 , the connecting portion 700 is fixed to the fixing member 500 , and the fixing member 500 is fixedly connected to the wall portion 101 .

[0127] The connection between the connecting portion 700 and the wall portion 101 is achieved through the fixing member 500 , which can improve the stability between the connecting portion 700 and the wall portion 101 and reduce problems such as damage to the connecting portion 700 during the installation process.

[0128] In some embodiments, the fixing member 500 is fixed to the outer circumference of the connecting portion 700 at least partially around the circumference of the connecting portion 700 .

[0129] Setting the fixing member 500 on the periphery of the connecting portion 700 can facilitate setting the fixing member 500 between the inner wall of the mounting hole 102 and the connecting portion 700, so that the fixing member 500 is located inside the mounting hole 102. This not only increases the connection stability between the inner wall of the mounting hole 102 and the connecting portion 700, but also reduces the interference of the fixing member 500 on the internal or external structure of the housing 100.

[0130] Optionally, the fixing member 500 can be a metal bracket with a mounting hole provided on the metal bracket. The connecting part 700 is installed in the mounting hole. The metal bracket is used as the fixing member 500 of the connecting part 700 and connected to the wall portion 101. This can improve the connection stability because the metal bracket can be connected to the wall portion 101 using a connection method with better stability, such as welding or riveting, thereby improving the reliability of the battery cell 1.

[0131] Another insulating member may be provided on the inner wall of the mounting hole 102 to achieve insulation isolation between the metal bracket and the connecting portion 700 , thereby improving the reliability of the battery cell 1 .

[0132] In some embodiments, as shown in FIG9 , battery cell 1 further includes an insulating substrate 707, which covers the side of the metal bracket facing away from the interior of housing 100. Insulating substrate 707 defines another mounting hole corresponding to and connected to mounting hole 102, and connecting portion 700 is embedded in the corresponding mounting hole 102 and the mounting hole on insulating substrate 707. This not only increases the strength of the metal bracket, but also provides electrical and fluid isolation, as well as a buffering effect, for the metal bracket, thereby reducing damage or interference to the metal bracket.

[0133] The insulating substrate 707 may include a plastic substrate, etc. The plastic material facilitates the molding of the plastic substrate. Alternatively, the insulating substrate 707 may include an insulating substrate with better heat dissipation, such as a ceramic substrate.

[0134] In some embodiments, the metal bracket is welded to the wall 101. The welding process can form a melt, which can connect the metal bracket and the wall 101 after solidification, thereby improving the stability between the metal bracket and the wall 101 and further improving the reliability of the battery cell 1.

[0135] In some embodiments, as shown in Figure 9, the mounting hole 102 includes a first hole segment 142 and a second hole segment 122 that are connected to each other, the first hole segment 142 is connected to the outside of the shell 100, and the second hole segment 122 is connected to the inside of the shell 100. The first hole segment 142 and the second hole segment 122 form a step surface 132 facing the outside of the shell at the connection between the two, and the fixing member 500 is supported on the step surface 132.

[0136] The step surface 132 can limit the movement of the fixing member 500 toward the inside of the housing 100, and the first hole section 142 and the second hole section 122 can limit the radial movement range of the fixing member 500 along the mounting hole 102, which is beneficial for the installation of the fixing member 500 and also beneficial for maintaining the structural stability of the fixing member 500 after the fixing member 500 is installed.

[0137] The axial direction of the mounting hole 102 refers to the spacing direction between one end of the mounting hole 102 facing the interior of the housing 100 and the other end away from the interior of the housing 100 . The radial direction of the mounting hole 102 is perpendicular to the axial direction of the mounting hole 102 .

[0138] In some embodiments, the fixing member 500 includes: a fixing section and an insertion section arranged along the preset axis F, the insertion section is arranged in the second hole section 122 , and the fixing section is arranged in the first hole section 142 and supported on the step surface 132 .

[0139] The step surface 132 can limit the movement of the fixed section toward the inside of the housing 100, the second hole section 122 can limit the radial movement range of the fixed section along the mounting hole 102, and the first hole section 142 can limit the radial movement range of the insertion section along the mounting hole 102, thereby facilitating the installation of the fixing member 500.

[0140] Optionally, the fixing section and the wall portion 101 may be connected by welding.

[0141] In some embodiments, the battery cell 1 further includes a sealing ring 152 disposed between the fixing section and the step surface 132 to improve the sealing performance between the fixing section and the step surface 132 , thereby improving the reliability of the battery cell 1 .

[0142] In some embodiments, the connection portion 700 may include a plurality of signal portions, and the signal portions are electrically connected to the sampling component 400 .

[0143] In some embodiments, the connecting portion 700 may also include two power supply portions and at least one signal portion. The battery cell 1 includes two electrode columns 900 . The two electrode columns 900 are arranged on the wall portion 101 and extend to the outside of the shell 100 . The two power supply portions are electrically connected to the two electrode columns 900 correspondingly outside the shell 100 to provide power to the sampling component 400 .

[0144] The connection part 700 is connected to the electrode column 900 outside the shell 100 and supplies power to the sampling assembly 400 inside the shell 100 through the connection part, which can reduce the power supply circuit structure inside the shell 100, facilitate maintenance and improve the safety of the battery cell 1.

[0145] In some embodiments, as shown in FIG3 , the housing 100 includes a shell 110 and an end cap 120 . The shell 110 has an open end 111 , and the end cap 120 covers the open end 111 . The sampling assembly 400 and the electrode assembly 200 are housed within the shell 110 . The end cap 120 forms a wall 101 . The mounting hole 102 is defined in the end cap 120 .

[0146] The opening 112 may be formed at the open end 111. The mounting hole 102 is formed on the end cover 120, which facilitates sealing the mounting hole 102.

[0147] Optionally, the sampling assembly 400 may be disposed on the inner side of the end cover 120 to facilitate installation of the sampling assembly 400 and collection of the environment inside the housing 100 .

[0148] Optionally, the sampling assembly 400 may be disposed on the inner side of the end cover 120 and connected thereto, or connected to other components in the housing 100 by injection molding or gluing, so as to facilitate routing of the sampling assembly 400 .

[0149] The end cap 120 can play a role in positioning the two electrode columns 900. The electrode columns 900 can be fixed relative to the end cap 120.

[0150] Specifically, one end of the electrode column 900 is set toward the interior of the outer shell 100 and can be used to electrically connect the electrode assembly 200 set inside the outer shell 100. The other end of the electrode column 900 is set toward the outside of the outer shell 100 and can be connected to the outside world and the circuit board 300, so that the electrode assembly 200 can supply power to the outside world and the circuit board 300 respectively through the electrode column 900.

[0151] Furthermore, the electrode assembly 200 can be charged through the electrode column 900 .

[0152] In other embodiments, the housing 110 may form a wall portion 101. The mounting hole 102 may be defined in the housing 110, for example, in the bottom wall of the housing 110, with the bottom wall of the housing 110 being disposed opposite the open end 111. This configuration increases the area available for mounting the connecting portion 700.

[0153] In some embodiments, the sampling assembly 400 includes a plurality of sampling modules, each of which is connected to at least one connecting portion 700 .

[0154] The sampling module is used to sample the environment inside the housing 100. During the use of the battery cell 1, the interior of the housing 100 is often in a dynamic state of change. For example, the electrode assembly 200 may expand in volume, the temperature and pressure inside the housing 100 may change, or gas may be generated inside the housing 100. The sampling module can be used to obtain environmental information inside the housing 100, such as sampling the gas, temperature, or pressure inside the housing 100, to improve the effectiveness of managing the operating status of the battery cell 1, thereby improving the operational stability of the battery cell 1.

[0155] The number of connection parts 700 connected to the sampling modules can be set according to the type and structural requirements of the sampling modules.

[0156] In some embodiments, the sampling component 400 may include a sampling module having multiple signal terminals, which may be electrically connected to multiple connection parts 700 respectively; or the sampling component 400 may include multiple sampling modules, each of which may be provided with a single or multiple signal terminals to connect to a single or multiple connection parts 700.

[0157] In some embodiments, the sampling assembly 400 may include one or more of a pressure sampling module, a gas sampling module, or a temperature sampling module.

[0158] The air pressure sampling module can be used to detect the air pressure within the housing 100. During the operation of the battery cell 1, air pressure changes may occur, for example, due to the generation of gas inside the housing 100 or a temperature increase, causing a rapid increase in air pressure. Using the air pressure sampling module to monitor the air pressure inside the housing 100 facilitates management of the operating status of the battery cell 1.

[0159] The temperature sampling module can be used to detect the temperature inside the housing 100. During the operation of the battery cell 1, temperature changes, such as temperature increases, may occur. Using the temperature sampling module to detect the temperature inside the housing 100 is helpful for managing the operating status of the battery cell 1.

[0160] The gas sampling module can be used to detect the type of gas in the housing 100 , which is beneficial for managing the working status of the battery cell 1 .

[0161] Optionally, the sampling module may be disposed in a packaging shell, and the packaging shell is connected to the end cover 120 to improve the reliability of the sampling module.

[0162] The encapsulation shell protects the sampling module. On the one hand, it reduces damage to the sampling module from factors outside the housing 100. On the other hand, it acts as a barrier between the sampling module, the electrode assembly 200, and the electrolyte, thereby reducing corrosion of the sampling module by the electrolyte inside the housing 100 and the electrode assembly 200, and reducing the risk of short circuits caused by direct contact between the sampling module and the electrode assembly 200.

[0163] Optionally, the packaging shell can be fixed to the end cover 120 by welding.

[0164] In some embodiments, as shown in FIG. 3 and FIG. 5 , the battery cell 1 further includes a plastic part 600 located between the electrode assembly 200 and the wall portion 101 .

[0165] The plastic part 600 is made of plastic material, which facilitates the molding of the plastic part 600 .

[0166] Furthermore, the plastic part 600 is made of insulating material and can form insulation between the electrode assembly 200 and the wall portion 101 , thereby limiting the current from flowing directly from the electrode assembly 200 to the wall portion 101 or directly from the wall portion 101 to the electrode assembly 200 .

[0167] In some embodiments, as shown in FIG. 11 , the battery cell 1 further includes a circuit board 300 . The circuit board 300 is disposed outside the housing 100 and is electrically connected to the connection portion 700 .

[0168] The environmental information obtained by the sampling component 400 is processed by the circuit board 300 arranged outside the housing 100 and electrically connected to the connecting portion 700 to determine the gas composition and concentration, temperature or pressure inside the housing 100, thereby analyzing the working status of the battery cell 1.

[0169] In some embodiments, the circuit board 300 is disposed on a side of the wall 101 facing away from the sampling assembly 400 , that is, a side of the wall 101 facing away from the interior of the housing 100 .

[0170] By placing the circuit board 300 on the side of the wall 101 facing away from the sampling assembly 400, i.e., outside the housing 100, installation and removal of the circuit board 300 are facilitated. The wall 101 prevents the circuit board 300 from contacting the electrode assembly 200 and the electrolyte, reducing the risk of short circuits caused by contact between the circuit board 300 and the electrode assembly 200, and also reduces corrosion of the circuit board 300 by the electrode assembly 200 and the electrolyte.

[0171] In some embodiments, the battery cell 1 further includes a processor, which is disposed on the circuit board 300 and electrically connected to the connecting portion 700 .

[0172] The processor can process the environmental information sampled by the sampling assembly 400, enabling intelligent operation of the battery cell 1. For example, the processor can determine the gas composition and concentration, temperature, or pressure inside the housing 100 based on the environmental information acquired by the sampling assembly 400, thereby analyzing the operating status of the battery cell 1.

[0173] A processor may be an integrated circuit chip with signal processing capabilities. A processor may also be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. A general-purpose processor may be a microprocessor or any conventional processor.

[0174] For example, the processor is an MCU. By arranging the processor on the circuit board 300 , the connection stability between the processor and the circuit board 300 can be improved, thereby improving the connection stability between the processor and the sampling component 400 .

[0175] The space on the side of the circuit board 300 facing away from the interior of the housing 100 is relatively spacious, and the processor can be arranged on the side of the circuit board 300 facing away from the interior of the housing 100, which is beneficial to heat dissipation of the processor.

[0176] In some embodiments, as shown in Figures 3 to 8 , a battery cell 1 includes a housing 100, a sampling assembly 400, and multiple insulated connectors 700. The housing 100 includes an end cap 120, which defines a mounting hole 102 that connects the interior and exterior of the housing 100. The sampling assembly 400 is housed within the housing 100. Multiple insulated connectors 700 are disposed within and seal the mounting hole 102, and are electrically connected to the sampling assembly 400.

[0177] Among them, the multiple connection parts 700 include a first connection part 710 arranged along a preset axis F and a second connection part 720 surrounding at least part of the outer periphery of the first connection part 710 along the circumference of the first connection part 710, and the second connection part 720 is closed and surrounds the outer periphery of the first connection part 710.

[0178] Furthermore, the battery cell 1 also includes: an insulating member 800, a fixing member 500, an insulating substrate 707, and a sealing ring 152; wherein the insulating member 800 is arranged between multiple connecting parts 700. The connecting part 700 is fixed to the fixing member 500, and the fixing member 500 is fixedly connected to the end cover 120. The insulating substrate 707 is covered on the side of the fixing member 500 facing away from the interior of the housing 100. The insulating substrate 707 is provided with another mounting hole corresponding to and connected to the mounting hole 102. The connecting part 700 is embedded in the corresponding mounting hole 102 and the mounting hole on the insulating substrate 707. The sealing ring 152 is arranged between the fixing section and the stepped surface 132. The battery cell 1 also includes a plastic part 600 located between the electrode assembly 200 and the wall portion 101.

[0179] The mounting hole 102 includes a first hole section 142 and a second hole section 122 that communicate with each other. The first hole section 142 communicates with the exterior of the housing 100, while the second hole section 122 communicates with the interior of the housing 100. A stepped surface 132 facing the exterior of the housing is formed at the junction of the first hole section 142 and the second hole section 122. The fixing member 500 is supported on the stepped surface 132. The fixing member 500 includes a fixed section and an insertion section arranged along the predetermined axis F. The insertion section is disposed within the second hole section 122, while the fixed section is disposed within the first hole section 142 and supported on the stepped surface 132.

[0180] In other embodiments, multiple connecting parts can also be arranged in a manner of extending and splicing circumferentially around a preset axis F; or one connecting part is arranged along the preset axis F, and the other connecting parts are extended and spliced ​​around the outer circumference of the connecting part; multiple connecting parts can be arranged in a circle of the outer circumference or in multiple circles of the outer circumference stacked radially.

[0181] In some embodiments, as shown in FIG2 , a battery 100a includes the aforementioned battery cell 1. This configuration can reduce the number of openings in the battery cell housing, thereby improving its strength and reducing the risk of structural failure. It can also simplify the process and save costs. Furthermore, it can reduce the space occupied by the openings, improving the compactness of the structure.

[0182] In some embodiments, the battery 100a further includes a battery management unit electrically connected to the connection portion 700. The battery management unit is electrically connected to the connection portion 700 so that the battery management unit automatically manages the battery cell 1 based on the environmental information obtained by the sampling component 400. For example, the battery management unit processes the environmental information obtained by the sampling component 400 to determine the gas composition and concentration, temperature, or pressure inside the housing 100, thereby analyzing the operating status of the battery cell 1.

[0183] In some embodiments, the battery 100 a further includes a housing 10 a and a circuit board 300 . The battery cell 1 is disposed in the housing 10 a . The circuit board 300 is disposed outside the housing 10 a and is electrically connected to the connection portion 700 .

[0184] The circuit board 300 disposed in the housing 10a and electrically connected to the connection portion 700 processes the environmental information acquired by the sampling component 400 to determine the gas composition and concentration, temperature or pressure inside the housing 100 , thereby analyzing the working status of the battery cell 1 .

[0185] By placing the circuit board 300 on the side of the housing 10a facing away from the interior of the outer shell 100, installation and removal of the circuit board 300 are facilitated. The housing 10a prevents the circuit board 300 from coming into contact with the electrode assembly 200 and the electrolyte, reducing the risk of the circuit board 300 short-circuiting due to contact with the battery cell 1 and also reducing interference from the battery cell 1 on the circuit board 300.

[0186] In some embodiments, as shown in FIG1 , an electrical device includes the aforementioned battery 100a. This configuration can reduce the number of openings in the battery cell housing, thereby improving its strength and reducing the risk of structural failure. It can also simplify the process and save costs. Furthermore, it can reduce the space occupied by the openings, improving the compactness of the structure.

[0187] In summary, the embodiments of the present application enable multiple insulating connection portions that seal the mounting holes to be installed through the same mounting hole on the housing. This allows multiple insulating connection portions to be installed through a single mounting hole, thereby reducing the number of mounting holes on the housing. On the one hand, because the strength of the housing decreases as the number of mounting holes increases, the above-described structure can increase the strength of the housing and reduce the risk of structural strength failure of the battery cells. On the other hand, because the sealing performance of the housing also decreases as the number of mounting holes increases, the above-described structure can also improve the sealing performance of the housing. Furthermore, because the connecting post corresponding to each mounting hole needs to be installed in the corresponding mounting hole, i.e., it needs to be fixedly connected to the housing, the increasing number of mounting holes increases the complexity of the battery cell manufacturing process. For example, a stepped surface needs to be machined on the housing for each mounting hole, which is costly. Therefore, the above-described structure can also reduce the complexity of the battery cell manufacturing process and save costs. Furthermore, by integrating the multiple insulating connection portions into the same mounting hole, compared to providing separate mounting holes without connecting portions, the area occupied by the mounting holes on the housing can be reduced, thereby improving the compactness of the structure.

[0188] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: At least: The housing comprises a wall portion, wherein the wall portion is provided with a mounting hole communicating with the interior and the exterior of the housing; A sampling assembly, contained in the housing; A plurality of connection parts connected in an insulated manner are arranged in the mounting hole and block the mounting hole. The plurality of connection parts are all electrically connected to the sampling component.

2. The battery cell according to claim 1, characterized in that: The plurality of connection parts include a first connection part arranged along a preset axis and a second connection part surrounding at least a portion of the outer circumference of the first connection part along a circumferential direction of the first connection part.

3. The battery cell according to claim 2, characterized in that: The second connection portion is closed and surrounds the outer periphery of the first connection portion.

4. The battery cell according to claim 2, characterized in that: The number of the second connection parts is at least two, and the at least two second connection parts are arranged at intervals along the circumference of the first connection part.

5. The battery cell according to claim 1, characterized in that: The connection portion is partially arranged around a preset axis, and the plurality of connection portions are spaced apart from each other along a circumferential direction of the preset axis.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The battery cell further comprises: An insulating member is disposed between the plurality of connecting portions.

7. The battery cell according to any one of claims 1 to 5, characterized in that: The battery cell further includes a fixing member, the connecting portion is fixed to the fixing member, and the fixing member is fixedly connected to the wall portion.

8. The battery cell according to claim 7, characterized in that: The fixing member is fixed to the outer circumference of the connecting portion at least partially around the connecting portion along the circumferential direction of the connecting portion.

9. The battery cell according to claim 7, characterized in that: The mounting hole includes a first hole segment and a second hole segment connected to each other, the first hole segment is connected to the outside of the shell, and the second hole segment is connected to the inside of the shell, and the first hole segment and the second hole segment form a step surface facing the outside of the shell at the connection between the two, and the fixing member is supported on the step surface.

10. The battery cell according to claim 9, characterized in that: The fixing member comprises: a fixing section and an insertion section which are arranged along a preset axis direction, the insertion section is arranged in the second hole section, and the fixing section is arranged in the first hole section and supported on the step surface.

11. The battery cell according to claim 10, characterized in that: The battery cell further comprises: A sealing ring is arranged between the fixing section and the step surface.

12. The battery cell according to claim 1, characterized in that: The shell includes a shell and an end cover, the shell is provided with an open end, the end cover is covered on the open end, the sampling assembly is accommodated inside the shell; the end cover forms the wall portion; the mounting hole is opened on the end cover.

13. The battery cell according to claim 1, characterized in that: The sampling component includes a plurality of sampling modules, and each of the sampling modules is connected to at least one of the connecting parts.

14. The battery cell according to claim 1, characterized in that: The battery cell further comprises: A circuit board is arranged outside the housing and is electrically connected to the connecting portion.

15. The battery cell according to claim 14, characterized in that: The circuit board is arranged on a side of the wall portion facing away from the sampling component.

16. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 15.

17. The battery according to claim 16, characterized in that The battery also includes: A battery management unit is electrically connected to the connecting portion.

18. The battery according to claim 16, characterized in that The battery also includes: A box body, wherein the battery cell is arranged in the box body; The circuit board is arranged outside the box and is electrically connected to the connecting part.

19. An electrical device, characterized in that: A battery comprising any one of claims 16 to 18.

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