Battery cell, battery device, and electric device

Abstract

Provided in the present application are a battery cell, a battery device, and an electric device. The battery cell comprises a housing, an electrode assembly, a blocking member, and a temperature measurement unit. The housing has an accommodating space, the housing comprising a first wall portion, the first wall portion having a through hole, and the through hole being in communication with the accommodating space. The electrode assembly is accommodated in the accommodating space. The blocking member blocks the through hole, and the blocking member comprises an extension portion extending into the accommodating space. The temperature measurement unit is disposed on the extension portion. The blocking member blocks the through hole, so that the accommodating space can be sealed. By arranging the temperature measurement unit on the extension portion of the blocking member extending into the accommodating space, the temperature measurement unit can be closer to the electrode assembly located in the accommodating space, thereby reducing the lag time for the temperature measurement unit to measure the internal temperature of the battery cell, enabling the temperature measurement unit to more quickly reflect the internal temperature of the battery cell, facilitating temperature monitoring of the battery cell, reducing the risk of thermal runaway of the battery cell due to temperature imbalance, and improving the reliability of the battery cell.

Description

Battery cells, battery packs and electrical devices Cross-reference to related applications

[0001] This application claims priority to Chinese patent application 202411205077.2, filed on August 29, 2024, entitled “Battery cell, battery device and power consumption device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and power supply device. Background Technology

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0004] Battery devices are widely used in portable electronic devices, electric vehicles, power tools, drones, energy storage devices, and other fields. A battery device consists of individual battery cells. In the use of these cells, in addition to considering their performance, their reliability is also a crucial issue. Therefore, improving the reliability of individual battery cells is a pressing problem that needs to be addressed in battery technology. Summary of the Invention

[0005] This application provides a battery cell, a battery device, and an electrical device, which can improve the reliability of the battery cell.

[0006] In a first aspect, embodiments of this application provide a battery cell, including a casing, an electrode assembly, a sealing member, and a temperature measuring unit. The casing has a receiving space and includes a first wall portion with a through hole communicating with the receiving space. The electrode assembly is received within the receiving space. The sealing member blocks the through hole and includes an extension portion extending into the receiving space. The temperature measuring unit is disposed on the extension portion.

[0007] In the above technical solution, the sealing component blocks the through hole, thus achieving a seal in the accommodating space. By placing the temperature measuring unit in the extension of the sealing component that extends into the accommodating space, the temperature measuring unit can be closer to the electrode assembly located within the accommodating space. This reduces the lag time in the temperature measuring unit's measurement of the battery cell's internal temperature, allowing the unit to respond to the battery cell's internal temperature more quickly. This facilitates temperature monitoring of the battery cell, reduces the risk of thermal runaway due to temperature imbalance, and improves the reliability of the battery cell.

[0008] In some embodiments, the sealing member has a receiving cavity that is not in communication with the receiving space, at least a portion of which is located within the extension, and the temperature measuring unit is housed within the receiving cavity. By placing the temperature measuring unit within the portion of the receiving cavity located within the extension, the temperature measuring unit is positioned close to the electrode assembly, facilitating temperature monitoring of the electrode assembly. The separation of the receiving space from the receiving cavity isolates the temperature measuring unit from the electrode assembly, reducing the risk of interference between them. The sealing member seals the receiving space, reducing the risk of leakage from the battery cell, thereby extending the battery cell's lifespan.

[0009] In some embodiments, the sealing member has a first opening in a receiving cavity for the temperature measuring unit to enter. By providing the first opening, the first opening facilitates the installation and removal of the temperature measuring unit, and the wires connecting the temperature measuring unit can also be led out to the outside of the battery cell through the first opening, making the temperature monitoring of the battery cell more convenient.

[0010] In some embodiments, the first opening is located at the end of the sealing member opposite to the electrode assembly. This makes it easier for the temperature measuring unit to enter the receiving cavity through the first opening, and also makes it easier to lead out the wires connecting the temperature measuring unit.

[0011] In some embodiments, the receiving cavity is a channel extending along a first direction, which is parallel to the thickness direction of the first wall. By providing a channel extending along the first direction, the installation of the temperature measuring unit is more convenient, and the processing of the channel is more efficient.

[0012] In some embodiments, the aperture of the channel is 0.5mm-2.5mm. When the aperture is greater than or equal to 0.5mm, the temperature measuring unit can enter the channel through the first opening, reducing the installation difficulty of the temperature measuring unit and facilitating its installation. It also makes it easier for the wires connecting the temperature measuring unit to be led out through the first opening. When the aperture is less than or equal to 2.5mm, the space occupied by the channel can be reduced, thereby reducing the size of the sealing component and the space occupied by the sealing component. This also reduces the risk of increased lag time in the temperature measurement of the electrode assembly due to an excessively large aperture. Therefore, when the aperture is 0.5mm-2.5mm, both the installation difficulty of the temperature measuring unit and the space occupied by the sealing component can be reduced, thus improving the performance of the battery cell.

[0013] In some embodiments, the aperture of the channel is 0.8mm-1.2mm. When the aperture of the channel is greater than or equal to 0.8mm, the installation difficulty of the temperature measuring unit can be further reduced, and the assembly of the temperature measuring unit can be realized; when the aperture of the channel is less than or equal to 1.2mm, the space occupied by the sealing component can be further reduced. Therefore, when the aperture of the channel is 0.8mm-1.2mm, the installation difficulty of the temperature measuring unit and the space occupied by the sealing component can be further reduced, thereby improving the performance of the battery cell.

[0014] In some embodiments, the thickness of the cavity wall in the portion of the receiving cavity located within the extension is 0.2 mm to 1.2 mm. When the cavity wall thickness is greater than or equal to 0.2 mm, the cavity wall has sufficient strength, reducing the risk of the cavity wall being damaged by pressure. When the cavity wall thickness is less than or equal to 1.2 mm, the temperature measuring unit within the receiving cavity can effectively measure the internal temperature of the battery cell, reducing the risk of excessively long temperature measurement lag time due to excessively thick cavity walls. Therefore, when the cavity wall thickness is 0.2 mm to 1.2 mm, both the strength of the cavity wall and the risk of long temperature measurement lag time can be balanced, improving the performance of the battery cell.

[0015] In some embodiments, the thickness of the cavity wall is 0.4mm-0.6mm. When the cavity wall thickness is greater than or equal to 0.4mm, the strength of the cavity wall can be further improved, reducing the risk of the cavity wall being damaged by pressure; when the cavity wall thickness is less than or equal to 0.6mm, the risk of excessive temperature measurement lag time due to excessive cavity wall thickness can be further reduced; therefore, when the cavity wall thickness is 0.4mm-0.6mm, both the strength of the cavity wall and the risk of long temperature measurement lag time can be further balanced, improving the performance of the battery cell.

[0016] In some embodiments, the temperature measuring unit is connected to the cavity wall of the portion of the receiving cavity located within the extension. By connecting the temperature measuring unit to the cavity wall, the position of the temperature measuring unit can be fixed, and heat conduction between the temperature measuring unit and the cavity wall is also facilitated, improving the heat conduction efficiency between the temperature measuring unit and the cavity wall and reducing the lag time of temperature measurement by the temperature measuring unit.

[0017] In some embodiments, the battery cell further includes a thermally conductive layer that connects the cavity wall and the temperature sensing unit. By connecting the cavity wall and the temperature sensing unit with the thermally conductive layer, the thermally conductive layer can restrict the position of the temperature sensing unit and reduce the risk of the temperature sensing unit detaching from the housing cavity. The thermally conductive layer can transfer heat from the cavity wall to the temperature sensing unit, reducing the lag time of temperature measurement by the temperature sensing unit.

[0018] In some embodiments, the temperature sensing unit is located outside the sealing element. This exposes the temperature sensing unit within the containment space, allowing it to directly detect the internal temperature of the battery cell, reducing the lag time in temperature measurement and making temperature measurement more convenient and efficient.

[0019] In some embodiments, the sealing member is provided with a channel that communicates with the outside of the housing. The channel forms a second opening at its extension, and the temperature measuring unit seals the second opening. By providing the channel, the wires connecting the temperature measuring unit can pass through the channel and connect to devices outside the housing to achieve the transmission of temperature measurement data. Sealing the second opening by the temperature measuring unit reduces the risk of leakage of battery cells through the channel.

[0020] In some embodiments, the sealing member includes a head and a rod. Along the thickness direction of the first wall, the head is connected to the end of the rod facing away from the electrode assembly. A portion of the rod passes through a through hole, and the portion of the rod extending into the receiving space is an extension. The head is configured to restrict movement of the rod along the direction of the first wall facing the electrode assembly. By providing the rod, it can extend into the receiving space, facilitating the placement of the temperature measuring unit within the space and reducing the lag time of temperature measurement. By providing the head, the movement of the rod is restricted, reducing the risk of the rod slipping into the receiving space and making the installation of the sealing member more stable.

[0021] In some embodiments, the rod portion includes a threaded portion located between the head and the extension portion along the thickness direction of the first wall portion, and the through hole includes a threaded segment, with the threaded portion and the threaded segment threadedly engaged. The threaded engagement of the threaded portion and the threaded segment can improve the connection stability between the sealing element and the first wall portion, and can also provide initial sealing for the through hole.

[0022] In some embodiments, the head and the first wall are sealed together. This sealed connection reduces the risk of leakage from individual battery cells through the through-hole.

[0023] In some embodiments, the head and the first wall are welded together. Welding the head and the first wall together improves the connection stability between them.

[0024] In some embodiments, the head is welded to the first wall to form a connection portion, the connection portion being disposed around the head about the axis of the rod portion, and the connection portion being configured to seal the head and the first wall portion. By distributing the connection portion around the head, the connection portion can seal the receiving space, reducing the risk of leakage of the battery cell through the through hole.

[0025] In some embodiments, along the thickness direction of the first wall portion, the first wall portion has a first surface facing away from the electrode assembly, the first surface is provided with a groove, a through hole connects the groove and a receiving space, and at least a portion of the head is received in the groove. By receiving at least a portion of the head in the groove, the risk of external components contacting the head and damaging the sealing member can be reduced.

[0026] In some embodiments, the housing includes a shell and an end cap, the shell having an opening, the end cap closing onto the opening, and the end cap being a first wall portion. By setting the end cap as the first wall portion, it facilitates the machining of the through hole, making the installation of the sealing element more convenient.

[0027] Secondly, embodiments of this application provide a battery device, including the battery cell provided in any one of the embodiments of the first aspect.

[0028] Thirdly, embodiments of this application provide an electrical device, including a battery cell provided in any one of the embodiments of the first aspect or a battery device provided in any one of the embodiments of the second aspect, wherein the battery cell is used to provide electrical energy to the electrical device.

[0029] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0031] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0032] Figure 2 is an exploded view of a battery provided in some embodiments of this application;

[0033] Figure 3 is an exploded view of a single battery cell provided in some embodiments of this application;

[0034] Figure 4 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0035] Figure 5 is a cross-sectional view AA of Figure 4;

[0036] Figure 6 is a magnified view of a portion of region A in Figure 5;

[0037] Figure 7 is a schematic diagram of the structure of the sealing component provided in some embodiments of this application;

[0038] Figure 8 is a BB cross-sectional view of Figure 7;

[0039] Figure 9 is a partial schematic diagram of a sealing member provided in some other embodiments of this application disposed on the first wall.

[0040] Marking Explanation: 1000 - Vehicle; 100 - Battery Unit; 10 - Battery Cell; 1 - Sealing Component; 11 - Receiving Cavity; 11a - Channel; 111 - First Opening; 112 - Second Opening; 12 - Extension; 13 - Head; 131 - Locking Part; 132 - Sealing Part; 14 - Rod Part; 141 - Threaded Part; 15 - Connecting Part; 2 - Electrode Assembly; 21 - Tab; 22 - Main Body; 2a - Current Collector; 3 - Electrode Terminal; 4-Outer shell; 41-Housing shell; 42-End cap; 43-First wall portion; 431-Through hole; 4311-Threaded section; 432-First surface; 4321-Sink; 433-Second surface; 434-First interface; 435-Protrusion; 4a-Accommodation space; 5-Temperature measuring unit; 6-Heat-conducting layer; 20-Box body; 201-First box body portion; 202-Second box body portion; 200-Controller; 300-Motor; Z-First direction. Detailed Implementation

[0041] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0043] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary and secondary relationship of the indicated technical features.

[0044] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces), unless otherwise explicitly specified.

[0046] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0047] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0048] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0049] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0050] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0051] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0052] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0053] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0054] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, at least one of lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co0.25Mn0.25O2 (also abbreviated as NCM211), LiNi0.6Co0.2Mn0.2O2 (also abbreviated as NCM622), LiNi0.8Co0.1Mn0.1O2 (also abbreviated as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.85Co0.15Al0.05O2) and their modified compounds.

[0055] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, or foam alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0056] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0057] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (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.).

[0058] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0059] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0060] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0061] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0062] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0063] In some implementations, the electrode assembly is a stacked structure.

[0064] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0065] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0066] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0067] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0068] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0069] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0070] In some embodiments, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0071] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0072] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0073] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0074] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0075] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0076] During the use of individual battery cells, it is necessary to monitor their temperature to allow for timely adjustments when abnormal internal temperatures occur. For example, in the event of an external short circuit, the internal temperature of the battery cell rises sharply. By monitoring temperature changes in a timely manner and quickly disconnecting the external circuitry, the risk of thermal runaway can be reduced, thus improving the reliability of the battery cell.

[0077] Temperature sensing units are typically installed on the outer surface of the battery cell's casing. The temperature data measured by these units is used to adjust the battery cell's operating conditions. However, the temperature measured by the sensing unit lags behind the real-time temperature inside the battery cell. This significant lag increases the risk of thermal runaway and reduces the battery cell's reliability.

[0078] Therefore, to reduce the risk of thermal runaway in a single battery cell, this application provides a battery cell including a casing, an electrode assembly, a sealing member, and a temperature measuring unit. The casing has a receiving space and includes a first wall portion with a through hole communicating with the receiving space. The electrode assembly is received within the receiving space. The sealing member seals the through hole and includes an extension extending into the receiving space. The temperature measuring unit is disposed on the extension portion.

[0079] By extending the extension into the housing space and placing the temperature measuring unit in the extension, the temperature measuring unit can be positioned close to the electrode assembly within the housing space. This reduces the lag time in which the temperature measuring unit measures the internal temperature of the battery cell, allowing the temperature measuring unit to react to the internal temperature of the battery cell more quickly. This facilitates temperature monitoring of the battery cell, reduces the risk of thermal runaway due to temperature imbalance, and improves the reliability of the battery cell.

[0080] The technical solutions described in the embodiments of this application are applicable to batteries and electrical devices that use batteries.

[0081] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0082] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0083] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0084] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0085] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0086] Please refer to Figure 2, which is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 20 and a battery cell 10. The housing 20 is used to house the battery cell 10.

[0087] The housing 20 is a component that houses the battery cell 10, providing a storage space for the battery cell 10. The housing 20 can adopt various structures. In some embodiments, the housing 20 may include a first housing portion 201 and a second housing portion 202, which overlap each other to define a storage space for accommodating the battery cell 10. The first housing portion 201 and the second housing portion 202 can be various shapes, such as cuboids, cylinders, etc. The first housing portion 201 can be a hollow structure open on one side, and the second housing portion 202 can also be a hollow structure open on one side. When the open side of the second housing portion 202 overlaps the open side of the first housing portion 201, a housing 20 with a storage space is formed. Alternatively, the first housing portion 201 can be a hollow structure with one side open, and the second housing portion 202 can be a plate-like structure, with the second housing portion 202 covering the open side of the first housing portion 201, thus forming a housing 20 with accommodating space. The first housing portion 201 and the second housing portion 202 can be sealed by a sealing element, such as a sealing ring or sealant.

[0088] In the battery device 100, there can be one or more battery cells 10. If there are multiple battery cells 10, they can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel. Alternatively, multiple battery cells 10 can be first connected in series, parallel, or in a mixed manner to form a battery device 100 module, and then the multiple battery device 100 modules can be connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the housing 20. Another option is that all battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the whole consisting of all battery cells 10 is housed within the housing 20.

[0089] In some embodiments, the battery device 100 may further include a busbar component, through which multiple battery cells 10 can be electrically connected to each other to achieve series, parallel, or mixed connection of multiple battery cells 10. The busbar component may be a metallic conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0090] Please refer to Figure 3, which is an exploded view of a battery cell 10 provided in some embodiments of this application. The battery cell 10 includes a housing 4 and an electrode assembly 2.

[0091] The housing 4 may include a housing 41 and an end cap 42, the housing 41 having an opening and the end cap 42 sealing the opening of the housing 41.

[0092] The housing 41 is a component used to house the electrode assembly 2. The housing 41 can be a hollow structure with an opening at one end, or it can be a hollow structure with openings at both opposite ends. The housing 41 can be in various shapes, such as cylindrical or cuboid. The housing 41 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0093] End cap 42 is a component that seals the opening of housing 41 to isolate the internal environment of battery cell 10 from the external environment. End cap 42 and housing 41 together define a receiving space for accommodating electrode assembly 2, electrolyte, and other components. End cap 42 can be connected to housing 41 by welding or roll sealing to close the opening of housing 41. The shape of end cap 42 can be adapted to the shape of housing 41. For example, if housing 41 is rectangular, end cap 42 can be a rectangular plate-like structure adapted to housing 41; or if housing 41 is cylindrical, end cap 42 can be a circular plate-like structure adapted to housing 41. The material of end cap 42 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, plastic, etc. The materials of end cap 42 and housing 41 can be the same or different.

[0094] In an embodiment where the housing 41 has an opening at one end, one end cap 42 may be provided accordingly. In an embodiment where the housing 41 has openings at opposite ends, two end caps 42 may be provided accordingly, with the two end caps 42 respectively closing the two openings of the housing 41, and the two end caps 42 and the housing 41 together defining the receiving space.

[0095] The electrode assembly 2 includes a main body 22 and electrode tabs 21. Electrode tabs 21 are provided at both ends of the main body 22. The electrode tabs 21 at both ends of the main body 22 are positive electrode tabs and negative electrode tabs, respectively.

[0096] The battery cell 10 may also include an electrode terminal 3, which is disposed on the housing 4. The electrode terminal 3 is used to electrically connect with the tab 21 of the electrode assembly 2 to input or output electrical energy of the battery cell 10. The electrode terminal 3 may be electrically connected to the positive tab of the electrode assembly 2 or the negative tab of the electrode assembly 2. The electrode terminal 3 may be disposed on the housing 41 of the housing 4 or on the end cap 42 of the housing 4. The electrode terminal 3 and the tab 21 can be directly connected, for example, by welding. The electrode terminal 3 and the tab 21 can also be indirectly connected, for example, through a current collector 2a. The current collector 2a can be a metallic conductor, such as copper, iron, aluminum, steel, or aluminum alloy.

[0097] As an example, as shown in Figure 3, one end of the housing 41 forms an opening, and the end cap 42 closes the opening of the housing 41. An electrode terminal 3 is provided on the end cap 42, and an electrode assembly 2 is disposed inside the housing 41. A current collector 2a is electrically connected to the electrode terminal 3 and the tab 21 of the electrode assembly 2, and the current collector 2a is located between the electrode terminal 3 and the electrode assembly 2.

[0098] Please refer to Figures 4-6. Figure 4 is a structural schematic diagram of a battery cell 10 provided in some embodiments of this application; Figure 5 is a cross-sectional view AA of Figure 4; Figure 6 is a partial enlarged view of region A in Figure 5. This application provides a battery cell 10, including a housing 4, an electrode assembly 2, a sealing member 1, and a temperature measuring unit 5. The housing 4 has a receiving space 4a and includes a first wall portion 43. The first wall portion 43 has a through hole 431 communicating with the receiving space 4a. The electrode assembly 2 is received in the receiving space 4a. The sealing member 1 seals the through hole 431 and includes an extension portion 12 extending into the receiving space 4a. The temperature measuring unit 5 is disposed in the extension portion 12.

[0099] The outer shell 4 is a hollow structure, and the shell 41 and the end cap 42 together enclose the receiving space 4a.

[0100] The first wall portion 43 may be an end cap 42. The first wall portion 43 may also be a wall portion on the housing 41; in an embodiment where the housing 41 has an opening at one end, the first wall portion 43 may be a wall portion disposed opposite to the end cap 42, or it may be a wall portion adjacent to the end cap 42.

[0101] The through hole 431 can penetrate the first wall portion 43 along the thickness direction, so that the receiving space 4a communicates with the outside. In some embodiments, the through hole 431 is a liquid injection hole, through which electrolyte can be injected into the receiving space 4a.

[0102] There can be one through hole 431, which is sealed by the sealing element 1. There can also be multiple through holes 431, with one sealing element 1 for each through hole 431.

[0103] The sealing element 1 can be press-fitted with the through hole 431 to achieve a seal for the through hole 431; alternatively, the sealing element 1 can be bonded, welded, or threaded to the first wall portion 43 to seal the through hole 431. In some embodiments, the sealing element 1 can be a sealing nail.

[0104] The portion of the sealing member 1 that extends into the receiving space 4a is the extension 12. The first wall portion 43 has a first interface 434 facing the receiving space 4a, and a through hole 431 extends to the first interface 434, communicating with the receiving space 4a at the position of the first interface 434. The portion of the sealing member 1 that protrudes from the first interface 434 along the direction of the first wall portion 43 toward the electrode assembly 2 is the extension 12. As an example, as shown in FIG6, along the thickness direction of the first wall portion 43, the first wall portion 43 has a first surface 432 and a second surface 433 disposed opposite to each other. The first surface 432 faces the outside of the housing 4, and the second surface 433 faces the electrode assembly 2. The first wall portion 43 includes a protrusion 435, at least a portion of which protrudes from the second surface 433 along the direction of the first wall portion 43 toward the electrode assembly 2. The end face of the protrusion 435 near the electrode assembly 2 is the first interface 434.

[0105] The temperature measuring unit 5 can be disposed on the outer surface of the extension 12; or the extension 12 can cover the temperature measuring unit 5. The temperature measuring unit 5 can be a thermistor temperature sensor, a thermocouple temperature sensor, etc.

[0106] As an example, as shown in Figures 4-6, a through hole 431 is opened in the end cap 42, the sealing member 1 blocks the through hole 431 and partially protrudes from the side of the end cap 42 facing the receiving space 4a, the part of the sealing member 1 that extends into the receiving space 4a is the extension 12, and the temperature measuring unit 5 is disposed in the extension 12.

[0107] In this embodiment, the sealing member 1 seals the through hole 431, thereby sealing the accommodating space 4a. By placing the temperature measuring unit 5 within the extension 12 of the sealing member 1 that extends into the accommodating space 4a, the temperature measuring unit 5 can be positioned closer to the electrode assembly 2 located within the accommodating space 4a. This reduces the lag time in the temperature measuring unit 5's measurement of the internal temperature of the battery cell 10, allowing the temperature measuring unit 5 to react to the internal temperature of the battery cell 10 more quickly. This facilitates temperature monitoring of the battery cell 10, reduces the risk of thermal runaway due to temperature imbalance, and improves the reliability of the battery cell 10. Furthermore, the battery cell 10 provided in this embodiment not only reduces the lag time in the temperature measuring unit 5's measurement of the internal temperature of the battery cell 10 but also achieves sealing of the battery cell 10, facilitating monitoring of the internal temperature of the battery cell 10 during normal use. By placing the temperature measuring unit 5 within the sealing member 1, the installation of the temperature measuring unit 5 can be achieved during the installation of the sealing member 1, making the installation of the temperature measuring unit 5 more convenient.

[0108] In some embodiments, please continue to refer to FIG6. The sealing member 1 is provided with a receiving cavity 11 that is not in communication with the receiving space 4a, at least a portion of the receiving cavity 11 is located within the extension 12, and the temperature measuring unit 5 is received in the receiving cavity 11.

[0109] The receiving cavity 11 can be a sealed cavity within the sealing member 1, with the temperature measuring unit 5 disposed within this sealed cavity; alternatively, the receiving cavity 11 can be a cavity on the sealing member 1 that communicates with the external environment. The entire receiving cavity 11 can be located within the extension 12; alternatively, a portion of the receiving cavity 11 can be located within the extension 12, with another portion extending into the through hole 431, or extending to the side of the first wall 43 opposite to the electrode assembly 2. The temperature measuring unit 5 is housed in the portion of the receiving cavity 11 located within the extension 12.

[0110] By placing the temperature measuring unit 5 within the extension 12 of the receiving cavity 11, the temperature measuring unit 5 is positioned close to the electrode assembly 2, facilitating temperature monitoring of the electrode assembly 2. The receiving space 4a is not connected to the receiving cavity 11, achieving isolation between the temperature measuring unit 5 and the electrode assembly 2, reducing the risk of interference between them. The sealing member 1 seals the receiving space 4a, reducing the risk of leakage from the battery cell 10, thereby extending the service life of the battery cell 10.

[0111] In some embodiments, the sealing member 1 has a first opening 111 of a receiving cavity 11 into which the temperature measuring unit 5 enters.

[0112] The first opening 111 is located on the portion of the sealing member 1 that protrudes from the outside of the battery cell 10. The first opening 111 can be located at the end of the sealing member 1 facing away from the electrode assembly 2, or it can be located on the side of the portion of the sealing member 1 that protrudes from the outside of the battery cell 10. The first opening 111 can be the opening of the receiving cavity 11, which communicates with the outside of the battery cell 10 through the first opening 111. In embodiments where the temperature measuring unit 5 is connected to a wire, the temperature measuring unit 5 is electrically connected to an external component via the wire. The wire can be connected to the external component through the first opening 111. The external component can be a controller 200, an alarm, etc.

[0113] By setting the first port 111, the first port 111 facilitates the installation and removal of the temperature measuring unit 5. The wires connecting the temperature measuring unit 5 can also be led out to the outside of the battery cell 10 through the first port 111, making the temperature monitoring of the battery cell 10 more convenient.

[0114] In some embodiments, the first opening 111 is disposed at one end of the sealing member 1 away from the electrode assembly 2.

[0115] As an example, as shown in Figure 6, the first opening 111 is the opening of the receiving cavity 11, and the first opening 111 is located at the end of the sealing member 1 away from the electrode assembly 2.

[0116] In this way, it is more convenient for the temperature measuring unit 5 to enter the receiving cavity 11 through the first opening 111, and it is also more convenient to lead out the wires connecting the temperature measuring unit 5.

[0117] In some embodiments, please continue to refer to FIG6. The receiving cavity 11 is a channel 11a extending along a first direction Z, which is parallel to the thickness direction of the first wall portion 43.

[0118] The channel 11a extends along the first direction Z to the outside of the battery cell 10, and the channel 11a is not connected to the receiving space 4a through the cavity wall of the receiving cavity 11.

[0119] By setting a channel 11a extending along the first direction Z, the installation of the temperature measuring unit 5 becomes more convenient, and the processing of the channel 11a becomes more convenient.

[0120] In some embodiments, please refer to Figure 7, which is a schematic diagram of the structure of the sealing member 1 provided in some embodiments of this application. The diameter of the channel 11a is 0.5mm-2.5mm.

[0121] The channel 11a can be a circular hole, a polygonal hole, etc. In an embodiment where the channel 11a is a circular hole, the diameter of the channel 11a is the diameter of the circular hole. When the channel 11a is a polygonal hole, the diameter of the channel 11a is the diameter of the inscribed circle of the projection of the channel 11a in a projection plane perpendicular to the first direction Z.

[0122] The aperture of channel 11a can be any one of the following, or any combination of two: 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, and 2.5mm.

[0123] When the aperture of the channel 11a is greater than or equal to 0.5 mm, the temperature measuring unit 5 can enter the channel 11a through the first opening 111, reducing the installation difficulty of the temperature measuring unit 5 and facilitating its installation. It also makes it easier for the wires connecting the temperature measuring unit 5 to be led out through the first opening 111. When the aperture of the channel 11a is less than or equal to 2.5 mm, the space occupied by the channel 11a can be reduced, thereby reducing the size of the sealing component 1 and the space occupied by the sealing component 1. This also reduces the risk of increased lag time in the temperature measurement of the electrode assembly 2 due to the excessively large aperture of the channel 11a. Therefore, when the aperture of the channel 11a is between 0.5 mm and 2.5 mm, it is possible to balance reducing the installation difficulty of the temperature measuring unit 5 and reducing the space occupied by the sealing component 1, thereby improving the performance of the battery cell 10.

[0124] In some embodiments, the aperture of the channel 11a is 0.8 mm to 1.2 mm.

[0125] The space of the channel 11a can be any one of 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm or any value between two of them.

[0126] As an example, as shown in Figure 7, the channel 11a is a circular hole with a diameter of L1, where L1 = 1 mm.

[0127] When the aperture of channel 11a is greater than or equal to 0.8mm, the installation difficulty of temperature measuring unit 5 can be further reduced, and the assembly of temperature measuring unit 5 can be realized; when the aperture of channel 11a is less than or equal to 1.2mm, the space occupied by sealing component 1 can be further reduced; therefore, when the aperture of channel 11a is 0.8mm-1.2mm, the installation difficulty of temperature measuring unit 5 and the space occupied by sealing component 1 can be further reduced, thereby improving the performance of battery cell 10.

[0128] In some embodiments, please refer to FIG8, which is a BB cross-sectional view of FIG7. The thickness of the cavity wall of the portion of the receiving cavity 11 located within the extension 12 is 0.2mm-1.2mm.

[0129] The surface of the cavity wall of the receiving cavity 11 located within the extension 12 facing away from the receiving cavity 11 is exposed within the receiving space 4a. The thickness of the cavity wall refers to the minimum thickness of the cavity wall of the portion of the receiving cavity 11 located within the extension 12, that is, the thickness of the thinnest part of the cavity wall.

[0130] The thickness of the cavity wall can be any one of the following values, or any value between two of them: 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, and 1.2mm.

[0131] When the thickness of the cavity wall is greater than or equal to 0.2 mm, the cavity wall has sufficient strength, reducing the risk of the cavity wall being damaged by pressure. When the thickness of the cavity wall is less than or equal to 1.2 mm, the temperature measuring unit 5 inside the cavity 11 can effectively measure the temperature inside the battery cell 10, reducing the risk of excessive temperature measurement lag due to excessively thick cavity walls. Therefore, when the thickness of the cavity wall is 0.2 mm to 1.2 mm, both the strength of the cavity wall and the risk of long temperature measurement lag can be balanced, improving the performance of the battery cell 10.

[0132] In some embodiments, the thickness of the cavity wall of the portion of the receiving cavity 11 located within the extension 12 is 0.4 mm to 0.6 mm.

[0133] The thickness of the cavity wall can be any one of the following values, or any value between two of them: 0.4mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm, 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.5mm, 0.51mm, 0.52mm, 0.53mm, 0.54mm, 0.55mm, 0.56mm, 0.57mm, 0.58mm, 0.59mm, and 0.6mm.

[0134] As an example, as shown in Figure 8, the thickness of the cavity wall is L2, where L2 = 0.5 mm.

[0135] When the thickness of the cavity wall is greater than or equal to 0.4 mm, the strength of the cavity wall can be further improved, reducing the risk of the cavity wall being damaged by pressure. When the thickness of the cavity wall is less than or equal to 0.6 mm, the risk of excessive temperature measurement lag time due to excessive cavity wall thickness can be further reduced. Therefore, when the thickness of the cavity wall is 0.4 mm to 0.6 mm, the strength of the cavity wall and the risk of long temperature measurement lag time can be further balanced, improving the performance of the battery cell 10.

[0136] In some embodiments, the temperature measuring unit 5 is connected to the cavity wall of the portion of the receiving cavity 11 located within the extension 12.

[0137] The temperature measuring unit 5 can be snapped, glued, or connected to the cavity wall by fasteners, such as bolts.

[0138] By connecting the temperature measuring unit 5 to the cavity wall, the position of the temperature measuring unit 5 can be fixed, which is also beneficial to the heat conduction between the temperature measuring unit 5 and the cavity wall, improving the heat conduction efficiency between the temperature measuring unit 5 and the cavity wall, and reducing the lag time of temperature measurement by the temperature measuring unit 5.

[0139] In some embodiments, the battery cell 10 further includes a thermally conductive layer 6, which connects the cavity wall of the portion of the receiving cavity 11 located within the extension 12 and the temperature measuring unit 5.

[0140] Alternatively, the temperature measuring unit 5 can rest against the cavity wall, and the thermally conductive layer 6 can connect the cavity wall and the temperature measuring unit 5 to stabilize the temperature measuring unit 5 against the cavity wall; or the temperature measuring unit 5 can be connected to the cavity wall through the thermally conductive layer 6. The thermally conductive layer 6 can be a thermally conductive adhesive.

[0141] The cavity wall and the temperature measuring unit 5 are connected by a heat-conducting layer 6. The heat-conducting layer 6 can restrict the position of the temperature measuring unit 5 and reduce the risk of the temperature measuring unit 5 falling out of the receiving cavity 11. The heat-conducting layer 6 can transfer the heat of the cavity wall to the temperature measuring unit 5, reducing the lag time of temperature measurement by the temperature measuring unit 5.

[0142] In some embodiments, please refer to Figure 9, which is a partial schematic diagram of the sealing member 1 disposed on the first wall according to other embodiments of this application. The temperature measuring unit 5 is located outside the sealing member 1.

[0143] The temperature measuring unit 5 is disposed on the extension 12 and located outside the sealing member 1, so that the temperature measuring unit 5 is directly within the receiving space 4a. The temperature measuring unit 5 can be directly connected to the extension 12, for example, the temperature measuring unit 5 has a shell portion, and the shell portion of the temperature measuring unit 5 is connected to the extension 12; or the temperature measuring unit 5 can be indirectly connected to the extension 12, for example, the temperature measuring unit 5 is bonded to the extension 12.

[0144] In this way, the temperature measuring unit 5 is exposed in the accommodating space 4a, and the temperature measuring unit 5 can directly detect the temperature inside the battery cell 10, reducing the lag time of temperature measurement by the temperature measuring unit 5, making temperature measurement more convenient and efficient.

[0145] In some embodiments, please continue to refer to Figure 9. The sealing member 1 is provided with a channel 11a, which communicates with the outside of the housing 4. The channel 11a forms a second opening 112 in the extension 12, and the temperature measuring unit 5 seals the second opening 112.

[0146] In an embodiment where the temperature measuring unit 5 is electrically connected to an external component via a wire, the wire can pass through the channel 11a to connect to the outside of the battery cell, enabling data transmission of the temperature measuring unit 5. The temperature measuring unit 5 can be bonded to the extension 12.

[0147] By setting the channel 11a, the wires connecting the temperature measuring unit 5 can pass through the channel 11a and be led out from the first opening 111 to realize the transmission of temperature measurement data.

[0148] In some embodiments, please continue to refer to Figures 4-8. The sealing member 1 includes a head 13 and a rod 14. Along the thickness direction of the first wall 43, the head 13 is connected to one end of the rod 14 away from the electrode assembly 2. A portion of the rod 14 passes through the through hole 431. The portion of the rod 14 that extends into the receiving space 4a is an extension 12. The head 13 is configured to restrict the movement of the rod 14 along the direction of the first wall 43 facing the electrode assembly 2.

[0149] The head 13 and the rod 14 can be separately configured and connected; alternatively, they can be integrally formed. Along the thickness direction of the first wall 43, the projection of the rod 14 is located within the head 13, so that when the rod 14 moves towards the electrode assembly 2, the head 13 can abut against the first wall 43 to restrict the movement of the rod 14. A portion of the rod 14 passes through the through hole 431 and protrudes from the side of the first wall 43 facing the receiving space 4a; the portion protruding from the first wall 43 facing the receiving space 4a is the extension 12.

[0150] As an example, as shown in Figures 7 and 8, the head 13 includes a locking part 131 and a sealing part 132. The sealing part 132 is disposed around the locking part 131. The locking part 131 is hexagonal prism-shaped to facilitate screwing the sealing member 1 into or out of the through hole 431. The sealing part 132 is used to fit against the first wall part 43 to seal the sealing member 1 and the first wall part 43.

[0151] By providing the rod 14, which can extend into the receiving space 4a, the temperature measuring unit 5 can be placed within the receiving space 4a, reducing the lag time of temperature measurement by the temperature measuring unit 5. By providing the head 13, the movement of the rod 14 can be restricted, reducing the risk of the rod 14 sliding into the receiving space 4a, thus making the installation of the sealing component 1 more stable.

[0152] In some embodiments, the rod portion 14 includes a threaded portion 141 located between the head 13 and the extension 12 along the thickness direction of the first wall portion 43, and the through hole 431 includes a threaded segment 4311, with the threaded portion 141 and the threaded segment 4311 threadedly engaged.

[0153] The through hole 431 may be provided with threaded sections 4311 along the thickness direction of the first wall portion 43; or the through hole 431 may be provided with threaded sections 4311 on a portion along the thickness direction of the first wall portion 43.

[0154] As an example, as shown in Figure 6, the threaded section 4311 extends from the end of the through hole 431 away from the receiving space 4a toward the receiving space 4a. The threaded section 4311 and the threaded portion 141 cooperate to lock the sealing member 1 and the first wall portion 43.

[0155] The threaded engagement of the threaded portion 141 and the threaded section 4311 can improve the connection stability between the sealing component 1 and the first wall portion 43, and can also provide initial sealing for the through hole 431.

[0156] In some embodiments, the head 13 and the first wall portion 43 are sealed together. This sealing connection can be achieved by an interference fit between the head 13 and the first wall portion 43; alternatively, it can be achieved by filling the space between the head 13 and the first wall portion 43 with sealant.

[0157] The sealed connection between the head 13 and the first wall 43 reduces the risk of leakage of the battery cell 10 through the through hole 431.

[0158] In some embodiments, the head 13 and the first wall portion 43 are welded together.

[0159] The head 13 and the first wall 43 may have only one solder joint, which connects the head 13 and the first wall 43; or the head 13 and the first wall 43 may have multiple solder joints, which are spaced apart, and each solder joint connects the head 13 and the first wall 43.

[0160] The connection stability between the head 13 and the first wall 43 is improved by welding the head 13 and the first wall 43 together.

[0161] In some embodiments, the head 13 is welded to the first wall portion 43 to form a connecting portion 15, the connecting portion 15 is disposed around the head 13 about the axis of the rod portion 14, and the connecting portion 15 is configured to seal the head 13 and the first wall portion 43.

[0162] As an example, as shown in FIG6, the sealing portion 132 of the head 13 and the first wall portion 43 are welded to form a weld mark, which is a connecting portion 15. The connecting portion 15 is arranged around the sealing portion 132 to seal the head 13 and the first wall portion 43.

[0163] By providing a connecting portion 15 around the head 13, the connecting portion 15 can seal the receiving space 4a, reducing the risk of leakage of the battery cell 10 through the through hole 431.

[0164] In some embodiments, please continue to refer to FIG6. Along the thickness direction of the first wall portion 43, the first wall portion 43 has a first surface 432 facing away from the electrode assembly 2. The first surface 432 is provided with a groove 4321. A through hole 431 connects the groove 4321 and the receiving space 4a. At least a portion of the head 13 is received in the groove 4321.

[0165] The entire head 13 can be contained within the settling tank 4321, with the end face of the head 13 facing away from the settling space 4a closer to the settling space 4a than the first surface 432. Alternatively, a portion of the head 13 can be contained within the settling tank 4321, while another portion protrudes from the first surface 432.

[0166] By accommodating at least a portion of the head 13 in the settling tank 4321, the risk of external components contacting the head 13 and damaging the sealing element 1 can be reduced.

[0167] In some embodiments, the housing 4 includes a housing 41 and an end cap 42. The housing 41 has an opening, and the end cap 42 closes to the opening. The end cap 42 is a first wall portion 43. By setting the end cap 42 as the first wall portion 43, it is beneficial to process the through hole 431, making the installation of the sealing member 1 more convenient.

[0168] This application provides a battery device 100, which includes a battery cell 10 provided in any of the above embodiments.

[0169] This application provides an electrical device, including a battery cell 10 or a battery device 100 provided in any of the above embodiments, wherein the battery cell 10 is used to provide electrical energy to the electrical device.

[0170] Please refer to Figures 4-8. This application provides a battery cell 10, which includes a housing 4, an electrode assembly 2, a sealing member 1, and a temperature measuring unit 5. The housing 4 has a receiving space 4a and includes a first wall portion 43. The first wall portion 43 has a through hole 431 communicating with the receiving space 4a. The electrode assembly 2 is received in the receiving space 4a. The sealing member 1 seals the through hole 431 and includes an extension portion 12 extending into the receiving space 4a. The sealing member 1 has a channel 11a extending from one end of the sealing member 1 away from the receiving space 4a to the extension portion 12. The temperature measuring unit 5 is disposed in the portion of the channel 11a located in the extension portion 12. The cavity wall of the portion of the channel 11a located in the extension portion 12 is connected and fixed to the temperature measuring unit 5 through a heat-conducting layer 6. The sealing member 1 also includes a head 13, which is welded to the first wall portion 43.

[0171] The sealing component 1 seals the through hole 431, thereby sealing the accommodating space 4a and reducing the risk of leakage from the battery cell 10. By placing the temperature measuring unit 5 on the extension 12 of the sealing component 1 and extending the extension 12 into the accommodating space 4a, the temperature measuring unit 5 can be positioned close to the electrode assembly 2 within the accommodating space 4a. This reduces the lag time in the temperature measuring unit 5 when measuring the internal temperature of the battery cell 10, allowing the temperature measuring unit 5 to react to the internal temperature of the battery cell 10 more quickly. This facilitates temperature monitoring of the battery cell 10, reduces the risk of thermal runaway due to temperature imbalance in the battery cell 10, and improves the reliability of the battery cell 10.

[0172] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A single battery cell, comprising: The outer shell has a receiving space, and the outer shell includes a first wall portion, the first wall portion having a through hole, the through hole communicating with the receiving space; Electrode assembly, housed in the housing space; A sealing element for sealing the through hole, the sealing element including an extension extending into the receiving space; A temperature measuring unit is disposed in the extension.

2. The battery cell as described in claim 1, wherein, The sealing member is provided with a receiving cavity that is not in communication with the receiving space, at least a portion of which is located within the extension, and the temperature measuring unit is housed within the receiving cavity.

3. The battery cell as described in claim 2, wherein, The sealing element has a first opening in the receiving cavity for the temperature measuring unit to enter.

4. The battery cell as described in claim 3, wherein, The first opening is located at the end of the sealing member opposite to the electrode assembly.

5. The battery cell as described in claim 4, wherein, The receiving cavity is a channel extending along a first direction, which is parallel to the thickness direction of the first wall portion.

6. The battery cell as described in claim 5, wherein, The diameter of the channel is 0.5mm-2.5mm.

7. The battery cell as described in claim 6, wherein, The diameter of the channel is 0.8mm-1.2mm.

8. The battery cell according to any one of claims 2-7, wherein, The thickness of the cavity wall of the portion of the receiving cavity located within the extension is 0.2mm-1.2mm.

9. The battery cell as described in claim 8, wherein, The thickness of the cavity wall is 0.4mm-0.6mm.

10. The battery cell according to any one of claims 2-9, wherein, The temperature measuring unit is connected to the cavity wall of the portion of the receiving cavity located within the extension.

11. The battery cell as claimed in claim 10, wherein, The battery cell also includes a thermally conductive layer, which connects the cavity wall and the temperature measuring unit.

12. The battery cell according to any one of claims 2-9, wherein, The temperature measuring unit is located outside the sealing component.

13. The battery cell as described in claim 12, wherein, The sealing component is provided with a channel that communicates with the outside of the housing. The channel forms a second opening in the extension, and the temperature measuring unit seals the second opening.

14. The battery cell according to any one of claims 1-13, wherein, The sealing member includes a head and a rod. Along the thickness direction of the first wall, the head is connected to one end of the rod away from the electrode assembly. A portion of the rod passes through the through hole, and the portion of the rod extending into the receiving space is an extension. The head is configured to restrict the movement of the rod along the direction of the first wall facing the electrode assembly.

15. The battery cell as described in claim 14, wherein, The rod portion includes a threaded portion, which is located between the head and the extension portion along the thickness direction of the first wall portion. The through hole includes a threaded segment, and the threaded portion and the threaded segment are threadedly engaged.

16. The battery cell as described in claim 14 or 15, wherein, The head and the first wall are sealed together.

17. The battery cell according to any one of claims 14-16, wherein, The head and the first wall are welded together.

18. The battery cell as claimed in claim 17, wherein, The head is welded to the first wall portion to form a connection portion, the connection portion is disposed around the head portion about the axis of the rod portion, and the connection portion is configured to seal the head portion and the first wall portion.

19. The battery cell according to any one of claims 14-18, wherein, Along the thickness direction of the first wall portion, the first wall portion has a first surface facing away from the electrode assembly, the first surface is provided with a groove, the through hole connects the groove and the receiving space, and at least a portion of the head is received in the groove.

20. The battery cell according to any one of claims 1-19, wherein, The housing includes a shell and an end cap, the shell having an opening, the end cap closing onto the opening, and the end cap being the first wall portion.

21. A battery device comprising a battery cell as claimed in any one of claims 1-20.

22. An electrical device comprising a battery cell as claimed in any one of claims 1-20 or a battery device as claimed in claim 21, wherein the battery cell is used to provide electrical energy to the electrical device.

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