Battery monomer, battery device and electric device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and a power utilization device. Each battery monomer comprises a shell, an electrode terminal and a connecting piece; the shell comprises a first wall; the electrode terminal is arranged on the first wall and comprises a terminal body, and the terminal body comprises a main body part and a flange part protruding out of the peripheral side of the main body part; the connecting piece is at least partially arranged on the periphery of the electrode terminal, the connecting piece is connected to the first wall, at least part of the flange part is arranged between the first wall and the connecting piece in the thickness direction of the first wall, and the connecting piece is used for fixing the electrode terminal to the first wall. The electrode terminal further comprises a reinforcing part, the reinforcing part is connected to the flange part, the material of the reinforcing part is different from that of the terminal body, and the hardness of the reinforcing part is larger than that of the terminal body. According to the technical scheme, the reliability of the battery device can be improved.

Description

Technical Field

[0001] This application relates to the field of battery device technology, and more specifically, to a battery cell, a battery device, and an electrical device. Background Technology

[0002] 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.

[0003] In the manufacturing process of battery devices, the reliability of the battery device is a crucial issue. Therefore, improving the reliability of battery devices is a pressing technical problem that needs to be solved. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device that can improve the reliability of the battery device.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, embodiments of this application provide a battery cell, which includes a casing, electrode terminals, and a connector. The casing includes a first wall; the electrode terminals are disposed on the first wall, and each electrode terminal includes a terminal body, which includes a main body portion and a flange portion protruding from the periphery of the main body portion; the connector is at least partially disposed on the outer periphery of the electrode terminal, and the connector is connected to the first wall. Along the thickness direction of the first wall, at least a portion of the flange portion is disposed between the first wall and the connector, and the connector is used to fix the electrode terminal to the first wall. The electrode terminal also includes a reinforcing member connected to the flange portion. The material of the reinforcing member is different from the material of the terminal body, and the hardness of the reinforcing member is greater than the hardness of the terminal body.

[0007] According to the embodiments of this application, at least a portion of the flange portion of the battery cell is disposed between the first wall and the connector. The connector and the first wall cooperate to clamp the flange portion to fix the electrode terminal. The hardness of the reinforcing member is greater than that of the terminal body. The reinforcing member has a higher resistance to deformation. The reinforcing member is connected to the flange portion, which can enhance the overall strength of the structure after the reinforcing member and the flange portion are connected. This makes the structure after the reinforcing member and the flange portion have a higher resistance to deformation, reduces the risk of deformation of the flange portion under stress, and facilitates the improvement of the reliability of the battery device composed of the battery cell.

[0008] According to some embodiments of this application, on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the reinforcing member and the orthographic projection of the connecting member at least partially overlap.

[0009] In the above scheme, by making the orthographic projection of the reinforcing member at least partially overlap with the orthographic projection of the connecting member, when the connecting member and the first wall cooperate to clamp the electrode terminal, the reinforcing member can absorb part of the force exerted on the electrode terminal by the connecting member and the first wall, further reducing the risk of deformation of the flange portion under stress.

[0010] According to some embodiments of this application, the hardness of the reinforcing member is greater than or equal to 100 kgf / mm². 2 And less than or equal to 500 kgf / mm 2 .

[0011] In the above scheme, the hardness of the reinforcing member satisfies the above relationship, the reinforcing member has good resistance to deformation, and the overall resistance to deformation of the structure after the reinforcing member is connected to the flange is high, so as to constrain the deformation of the flange under stress.

[0012] According to some embodiments of this application, the battery cell further includes an electrode assembly disposed within the housing, the electrode assembly having tabs; the terminal body includes a first conductive element and a second conductive element connected to each other, the first conductive element and the second conductive element being stacked along the thickness direction of the first wall, the first conductive element being used to connect with a busbar, and the second conductive element being used to connect with a tab; the hardness of the reinforcing member is greater than the hardness of the first conductive element and the hardness of the second conductive element.

[0013] In the above scheme, the first conductive element and the second conductive element are separately arranged. The first conductive element is used to connect with the busbar component, and the second conductive element is used to connect with the electrode tab. The materials of the first conductive element and the second conductive element can be different. The material of the first conductive element can be the same as the material of the busbar component, and the material of the second conductive element can be the same as the material of the electrode tab, so as to facilitate the connection of the first conductive element with the busbar component and the connection of the second conductive element with the electrode tab. The hardness of the reinforcing member is greater than the hardness of the first conductive element and the hardness of the second conductive element, which can enhance the deformation resistance of the terminal body.

[0014] According to some embodiments of this application, the first conductive member includes a first main body portion and a first flange portion, the first flange portion protruding from the periphery of the first main body portion; the second conductive member includes a second main body portion and a second flange portion, the second flange portion protruding from the periphery of the second main body portion; the second main body portion and the first main body portion constitute the main body portion, and the second flange portion and the first flange portion constitute the flange portion; on the same projection plane perpendicular to the thickness direction of the first wall, the projection of the first flange portion and the projection of the second flange portion at least partially overlap.

[0015] In the above scheme, the first main body and the second main body constitute the main body. The first main body is used to connect with the busbar component, and the second main body is used to connect with the electrode tab. The second flange and the first flange constitute the flange. The connector and the first wall clamp the first flange and the second flange so as to fix the electrode terminal to the first wall.

[0016] According to some embodiments of this application, the materials of the first conductive element and the second conductive element are different.

[0017] In the above scheme, the materials of the first conductive element and the second conductive element are different. On the one hand, the material of the first conductive element can be the same as the material of the busbar component, and the material of the second conductive element can be the same as the material of the electrode tab, so as to realize the connection between the first conductive element and the busbar component and the connection between the second conductive element and the electrode tab; on the other hand, it can also reduce the cost of the electrode terminals.

[0018] According to some embodiments of this application, the first conductive element is made of aluminum, and the second conductive element is made of copper.

[0019] In the above scheme, the first conductive component is made of aluminum, which is easy to weld with the busbar component, and the second conductive component is made of copper, which is easy to weld with the electrode tab, thus meeting the assembly requirements of the electrode terminal with the busbar component and the electrode tab.

[0020] According to some embodiments of this application, a reinforcing member is disposed between the first conductive member and the second conductive member.

[0021] In the above scheme, the reinforcing member is disposed between the first conductive member and the second conductive member. The first conductive member and the second conductive member can be electrically connected through the reinforcing member. The reinforcing member can improve the overall strength of the terminal body, so as to improve the deformation resistance of the electrode terminal and reduce the risk of deformation of the electrode terminal under stress.

[0022] According to some embodiments of this application, along the thickness direction of the first wall, the reinforcing member is located on the side of the flange portion away from the first wall; or, along the thickness direction of the first wall, the reinforcing member is located between the flange portion and the first wall.

[0023] In the above scheme, the reinforcing member is located on the side of the flange portion away from the first wall, or the reinforcing member is located on the side of the flange portion facing the first wall, which facilitates the assembly of the reinforcing member and the terminal body.

[0024] According to some embodiments of this application, the reinforcing member is disposed at least partially around the main body.

[0025] In the above scheme, the reinforcing member is at least partially arranged around the main body and can be connected to the flange at multiple positions in the circumferential direction of the main body, so as to improve the deformation resistance of the flange at multiple positions in the circumferential direction of the main body and further reduce the risk of deformation of the flange under stress.

[0026] According to some embodiments of this application, the reinforcing member is made of steel, titanium alloy, or carbon fiber resin composite material.

[0027] In the above scheme, the reinforcing member is made of steel, titanium alloy or carbon fiber resin composite material, which has high hardness and good resistance to deformation.

[0028] According to some embodiments of this application, the battery cell further includes a seal, at least a portion of which is disposed between the flange and the first wall along the thickness direction of the first wall, and the seal at least partially overlaps with the reinforcement.

[0029] In the above solution, at least a portion of the seal is disposed between the flange and the first wall to form a sealing structure between the flange and the first wall, thereby reducing the risk of electrode liquid flowing out from the electrode outlet hole; at the same time, the seal has the ability to elastically deform, and the seal and the reinforcing member overlap at least partially, and the reinforcing member can resist a portion of the force applied to the flange by the seal, thereby reducing the risk of deformation of the flange under stress.

[0030] According to some embodiments of this application, the battery cell further includes a first insulating member, which is at least partially disposed between the electrode terminal and the connector, and at least partially surrounds the electrode terminal.

[0031] In the above scheme, the first insulating member is disposed between the electrode terminal and the connector. The first insulating member is disposed at least partially around the electrode terminal, which can separate the electrode terminal and the connector and reduce the risk of short circuit between positive and negative electrodes.

[0032] According to some embodiments of this application, both the connector and the first insulating member are arranged around the electrode terminal.

[0033] In the above scheme, the connector is arranged around the electrode terminal, which can constrain the electrode terminal at any position in the circumferential direction of the electrode terminal; the first insulating member is arranged around the electrode terminal, which can separate the electrode terminal and the connector at any position in the circumferential direction of the electrode terminal, thereby improving the insulation effect.

[0034] Secondly, embodiments of this application provide a battery device that includes a battery cell provided according to any of the above embodiments.

[0035] Thirdly, embodiments of this application provide an electrical device that includes a battery device according to any of the above embodiments.

[0036] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0039] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0040] Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0041] Figure 4 Cross-sectional views of a portion of the structure of a battery cell provided in some embodiments of this application;

[0042] Figure 5 Cross-sectional views of a portion of the structure of a battery cell provided in other embodiments of this application;

[0043] Figure 6 Schematic diagrams of the structure of the first and second conductive elements provided in some embodiments of this application;

[0044] Figure 7 Schematic diagrams of the structure of the first and second conductive elements provided in other embodiments of this application;

[0045] Figure 8 An assembly diagram of the first conductive element and the second conductive element provided in some embodiments of this application;

[0046] Figure 9 Assembly diagram of the first and second conductive elements provided for other embodiments of this application;

[0047] Figure 10 A cross-sectional view of a partial structure of a battery cell provided in some embodiments of this application.

[0048] Icons: 100 - Battery assembly; 10 - Housing; 11 - First sub-housing; 12 - Second sub-housing; 20 - Battery cell; 21 - Housing; 211 - Shell; 212 - End cap; 21a - First wall; 21b - Electrode lead-out hole; 22 - Electrode assembly; 22a - Tab; 23 - Electrode terminal; 231 - Terminal body; 231a - First conductive element; 231b - Second conductive element; 2311 - Main body; 2311a - First main body; 2311 b - Second main body; 2312 - Flange; 2312a - First flange; 2312b - Second flange; 2313 - First end face; 2314 - Second end face; 232 - Reinforcing member; 24 - Connecting member; 241 - Through hole; 25 - Sealing member; 26 - First insulating member; 27 - Second insulating member; 28 - First solder mark; 200 - Controller; 300 - Motor; 1000 - Vehicle; P - Central axis of the main body; Z - Thickness direction of the first wall. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0051] In this application, the reference to "embodiment" means that a specific 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0053] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0054] 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).

[0055] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0056] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0057] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0058] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be housed in the housing by fixing the battery module in the housing.

[0059] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0060] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first sub-enclosure may be a top cover or a bottom plate.

[0061] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0062] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0063] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0064] 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.

[0065] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0066] 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, prevents short circuits while allowing active ions to pass through.

[0067] 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.

[0068] 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.

[0069] 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 made of stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium with a silver-plated surface. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector 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.).

[0070] 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.

[0071] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0072] As an example, the negative 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, or made of carbon, nickel, or titanium, etc.

[0073] In some embodiments, 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.

[0074] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in batteries. 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 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.

[0075] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0076] As an example, the main 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 located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0077] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0078] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0079] In some implementations, the electrode assembly is a stacked structure.

[0080] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be a steel housing, an aluminum housing, or a composite metal housing (such as a copper-aluminum composite housing).

[0081] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0082] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal can be located on the end cap or on the housing.

[0083] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0084] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0085] As an example, a 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.

[0086] The development of battery device technology must take into account multiple design factors, such as performance parameters like energy density, discharge capacity, and charge / discharge rate. In addition, the reliability of the battery device also needs to be considered.

[0087] In some embodiments, a battery cell includes a housing, electrode terminals, and a connector. The housing includes a first wall, the electrode terminals are disposed on the first wall, and the connector is used to fix the electrode terminals to the first wall. Typically, the electrode assembly includes a body portion and a flange portion. The flange portion protrudes from the periphery of the body portion, and a portion of the flange portion is disposed between the first wall and the connector. The flange portion is clamped by the connector and the first wall to fix the electrode terminals. The electrode terminals connect to tabs and a busbar to realize the output or input of electrical energy of the battery cell. During use or transportation, the battery cell is subjected to external forces. Because the electrode terminals connect to the tabs and the busbar, the connection between the flange portion of the electrode terminals and the body portion is prone to stress concentration, causing the flange portion to deform under stress. This can lead to connection failure between the electrode terminals and the connected components, resulting in low reliability of the battery cell and, consequently, low reliability of the battery device constructed from the battery cell.

[0088] In view of this, in order to solve the problem of low reliability of battery devices caused by deformation of electrode terminals under stress, this application provides a battery cell, which includes a shell, electrode terminals, and a connector; the shell includes a first wall; the electrode terminals are disposed on the first wall, and the electrode terminals include a terminal body, which includes a main body portion and a flange portion protruding from the periphery of the main body portion; the connector is at least partially disposed on the outer periphery of the electrode terminals, and the connector is connected to the first wall. Along the thickness direction of the first wall, at least a portion of the flange portion is disposed between the first wall and the connector, and the connector is used to fix the electrode terminals to the first wall. The electrode terminals also include a reinforcing member, which is connected to the flange portion. The material of the reinforcing member is different from the material of the terminal body, and the hardness of the reinforcing member is greater than the hardness of the terminal body.

[0089] In such a battery cell, at least a portion of the flange is disposed between the first wall and the connector. The connector and the first wall cooperate to clamp the flange to fix the electrode terminal. The hardness of the reinforcing member is greater than that of the terminal body. The reinforcing member has a high resistance to deformation. The reinforcing member is connected to the flange, which can enhance the overall strength of the structure after the reinforcing member and the flange are connected. This makes the structure after the reinforcing member and the flange are connected have a high resistance to deformation, reduces the risk of deformation of the flange under stress, and facilitates the improvement of the reliability of the battery device composed of the battery cell.

[0090] The battery device disclosed in this application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. A power system for such electrical equipment can be constructed using the battery device disclosed in this application.

[0091] The technical solutions described in the embodiments of this application are applicable to various power devices that use battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft.

[0092] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device according to an embodiment of this application.

[0093] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can 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's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 1000.

[0094] 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.

[0095] 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.

[0096] Please refer to Figure 2 , Figure 2This is an exploded view of the structure of a battery device provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a space for the battery cell 20 and can have various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, jointly defining a space for accommodating the battery cell 20. The second sub-housing 12 may be a hollow structure with one open end, while the first sub-housing 11 may be a plate-like structure, covering the open side of the second sub-housing 12 so that the first sub-housing 11 and the second sub-housing 12 jointly define the space. Alternatively, both the first sub-housing 11 and the second sub-housing 12 may be hollow structures with one open side, with the open side of the first sub-housing 11 covering the open side of the second sub-housing 12.

[0097] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.

[0098] Please refer to Figure 3 , Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application. The battery cell 20 includes a housing 21, an electrode assembly 22, and other functional components. The housing 21 includes a casing 211 and an end cap 212. The casing 211 has an opening, and the end cap 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0099] The housing 211 is a component used to cooperate with the end cap 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can accommodate the electrode assembly 22, electrolyte, and other components. The housing 211 and the end cap 212 can be independent components. The housing 211 can have various shapes and sizes. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 22. The housing 211 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0100] End cap 212 refers to a component that covers the opening of housing 211 to isolate the internal environment of battery cell 20 from the external environment. The shape of end cap 212 can be adapted to the shape of housing 211 to fit it. Optionally, end cap 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 212 is not easily deformed under pressure and impact, giving battery cell 20 higher structural strength and improved reliability. Functional components such as electrode terminals 23 and pressure relief mechanisms can be provided on end cap 212. Electrode terminals 23 can be used for electrical connection with electrode assembly 22 to output or input electrical energy to battery cell 20. The material of end cap 212 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 212. The insulating structure can be used to isolate the electrical connection components within the housing 211 from the end cap 212 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0101] Electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction occurs. The housing 211 may contain one or more electrode assemblies 22. The electrode assembly 22 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets to separate them and prevent internal short circuits. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 22, while the portions without active material each constitute a tab. The positive and negative tabs may be located together at one end of the main body or separately at both ends.

[0102] Please refer to Figure 3 and further refer to Figure 4 and Figure 5 , Figure 4 This is a cross-sectional view of a partial structure of a battery cell provided in some embodiments of this application. Figure 5This is a cross-sectional view of a partial structure of a battery cell provided in some other embodiments of this application. Embodiments of this application provide a battery cell 20, which includes a housing 21, electrode terminals 23, and a connector 24. The housing 21 includes a first wall 21a. The electrode terminals 23 are disposed on the first wall 21a and include a terminal body 231. The terminal body 231 includes a main body portion 2311 and a flange portion 2312 protruding from the periphery of the main body portion 2311. The connector 24 is at least partially disposed on the outer periphery of the electrode terminals 23 and connected to the first wall 21a. Along the thickness direction Z of the first wall, at least a portion of the flange portion 2312 is disposed between the first wall 21a and the connector 24. The connector 24 is used to fix the electrode terminals 23 to the first wall 21a. The electrode terminals 23 also include a reinforcing member 232 connected to the flange portion 2312. The material of the reinforcing member 232 is different from the material of the terminal body 231, and the hardness of the reinforcing member 232 is greater than that of the terminal body 231.

[0103] In some embodiments, please refer to Figure 3 The outer casing 21 can be rectangular, and the battery cell 20 can be a rigid square battery cell.

[0104] In some embodiments, the first wall 21a may be an end cap 212, or the first wall 21a may be a wall portion of the housing 211.

[0105] Optionally, the first wall 21a is an end cap 212, which facilitates the assembly and positioning of the electrode terminal 23.

[0106] In some embodiments, the first wall 21a is provided with an electrode lead-out hole 21b, which is a through hole provided in the first wall 21a. A portion of the electrode terminal 23 is correspondingly disposed in the through hole so that the electrode terminal 23 can be electrically connected to the tab 22a of the electrode assembly 22 through the through hole. For example, a portion of the main body 2311 of the electrode terminal 23 extends into the through hole and is welded to the tab 22a, or the portion is electrically connected to the tab 22a through an adapter.

[0107] In some embodiments, there are two electrode lead-out holes 21b, one for a positive electrode and one for a negative electrode; there are two electrode terminals 23, one for a positive electrode and one for a negative electrode, with the positive electrode terminal corresponding to the positive electrode lead-out hole and the negative electrode terminal corresponding to the negative electrode lead-out hole; the electrode assembly 22 has a positive electrode tab and a negative electrode tab, with the positive electrode tab connected to the positive electrode terminal and the negative electrode tab connected to the negative electrode terminal. In this application, the electrode terminal 23, whose polarity is not limited, can be either a positive electrode terminal or a negative electrode terminal; correspondingly, the electrode terminal 23 is connected to the tab 22a of the same polarity.

[0108] Terminal body 231 and reinforcing member 232 are two components constituting electrode terminal 23. Terminal body 231 is used to connect busbar and electrode tab 22a; reinforcing member 232 is used to strengthen terminal body 231.

[0109] The main body 2311 is internally used for electrical connection with the tab 22a, and externally used for electrical connection with the busbar component.

[0110] The flange portion 2312 protrudes from the periphery of the main body portion 2311, and the flange portion 2312 cooperates with the main body portion 2311 to cover the electrode lead-out hole 21b. The periphery of the main body portion 2311 can be referred to as the outer peripheral surface of the main body portion 2311. The main body portion 2311 has a first end face 2313 and a second end face 2314 disposed opposite to each other along the thickness direction Z of the first wall. The first end face 2313 is away from the interior of the battery cell 20 relative to the second end face 2314. The first end face 2313 is used for electrical connection with the busbar component, and the second end face 2314 is used for electrical connection with the tab 22a. The outer peripheral surface of the main body portion 2311 connects the first end face 2313 and the second end face 2314.

[0111] In some embodiments, the main body 2311 may be cylindrical, and the flange 2312 protrudes from the outer periphery of the main body 2311 along the radial direction of the main body 2311.

[0112] In some embodiments, the flange portion 2312 may be circumferentially disposed around the main body portion 2311, for example, the flange portion 2312 may be disposed around the central axis P of the main body portion. Optionally, the extending direction of the central axis P of the main body portion is parallel to the thickness direction Z of the first wall.

[0113] The connector 24 is a component used to fix the electrode terminal 23 to the first wall 21a. The connector 24 can be welded to the first wall 21a, or the connector 24 can be integrally formed with the first wall 21a so that the connector 24 is firmly connected to the first wall 21a.

[0114] The connector 24 is at least partially disposed on the outer periphery of the electrode terminal 23, meaning that the connector 24 is at least partially disposed around the circumference of the electrode terminal 23, so that the connector 24 can fix the electrode terminal 23 at different positions in the circumference of the electrode terminal 23.

[0115] Viewed along the thickness direction Z of the first wall, at least a portion of the flange 2312 is disposed between the first wall 21a and the connector 24. When the electrode terminal 23 is assembled with the first wall 21a, the flange 2312 can be disposed on the outer side of the first wall 21a, and the connector 24 can cooperate with the first wall 21a to clamp the flange 2312; or, the flange 2312 can be disposed on the inner side of the first wall 21a, and the connector 24 can cooperate with the first wall 21a to clamp the flange 2312. It should be noted that the outer side of the first wall 21a refers to the side of the first wall 21a that faces away from the interior of the battery cell 20, and the inner side of the first wall 21a refers to the side of the first wall 21a that faces the interior of the battery cell 20.

[0116] In some embodiments, the flange portion 2312 may be disposed on the outer side of the first wall 21a.

[0117] The connection between the reinforcing member 232 and the flange portion 2312 can be in various ways. For example, the reinforcing member 232 can be cold-pressed, welded, bonded, or snap-fitted to the flange portion 2312.

[0118] In some embodiments, the terminal body 231 may be made of copper or aluminum.

[0119] In some embodiments, the reinforcing member 232 may be a metal part, and the material of the reinforcing member 232 may be steel, titanium alloy or other metal alloy; or, the reinforcing member 232 may be an insulating part, and the material of the reinforcing member 232 may be carbon fiber resin composite material.

[0120] The hardness of the reinforcing member 232 mentioned in the embodiments of this application can be Vickers hardness. The Vickers hardness measurement method is as follows: a diamond square pyramid indenter with a 136° apex angle is pressed into the material surface with a load of up to 120 kg. The Vickers hardness value (HV) is obtained by dividing the surface area of ​​the indentation by the load value. The standard test holding time is 10-15 seconds.

[0121] According to the battery cell 20 of this application embodiment, at least a portion of the flange portion 2312 is disposed between the first wall 21a and the connector 24. The connector 24 and the first wall 21a cooperate to clamp the flange portion 2312 to fix the electrode terminal 23. The hardness of the reinforcing member 232 is greater than that of the terminal body 231. The reinforcing member 232 has a higher resistance to deformation. The reinforcing member 232 is connected to the flange portion 2312, which can enhance the overall strength of the structure after the reinforcing member 232 and the flange portion 2312 are connected. This makes the structure after the reinforcing member 232 and the flange portion 2312 have a higher resistance to deformation, reduces the risk of deformation of the flange portion 2312 under stress, and facilitates the improvement of the reliability of the battery device 100 composed of the battery cell 20.

[0122] Please refer to Figure 4 and Figure 5 According to some embodiments of this application, on the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the reinforcing member 232 and the orthographic projection of the connecting member 24 at least partially overlap.

[0123] With the thickness direction Z of the first wall as the projection direction, the orthographic projection of the reinforcing member 232 at least partially overlaps with the orthographic projection of the connecting member 24. A portion of the reinforcing member 232 may be located between the connecting member 24 and the first wall 21a, or the entire reinforcing member 232 may be located between the connecting member 24 and the first wall 21a. For example, along the radial direction of the main body portion 2311, the length of the reinforcing member 232 is less than the length of the flange portion 2312, or the length of the reinforcing member 232 is equal to the length of the flange portion 2312. It should be noted that when the main body portion 2311 is non-cylindrical, the radial direction of the main body portion 2311 is the radial direction of the circumcircle of the main body portion 2311.

[0124] In the above scheme, by making the orthographic projection of the reinforcing member 232 at least partially overlap with the orthographic projection of the connecting member 24, when the connecting member 24 and the first wall 21a cooperate to clamp the electrode terminal 23, the reinforcing member 232 can absorb part of the force exerted on the electrode terminal 23 by the connecting member 24 and the first wall 21a, further reducing the risk of deformation of the flange portion 2312 under stress.

[0125] According to some embodiments of this application, the hardness of the reinforcing member 232 is greater than or equal to 100 kgf / mm². 2 And less than or equal to 500 kgf / mm 2 .

[0126] Optionally, the hardness of the reinforcing member 232 can be 100 kgf / mm². 2 120kgf / mm 2 140kgf / mm 2 160kgf / mm 2 180kgf / mm 2 200kgf / mm 2 220kgf / mm 2 240kgf / mm 2 260kgf / mm 2 280kgf / mm 2 300kgf / mm 2 320kgf / mm 2 340kgf / mm 2 360kgf / mm 2 380kgf / mm 2 400kgf / mm 2 420kgf / mm2 440kgf / mm 2 460kgf / mm 2 480kgf / mm 2 500kgf / mm 2 The range between any one of them or any two of them.

[0127] In the above scheme, the hardness of the reinforcing member 232 satisfies the above relationship, the reinforcing member 232 has good resistance to deformation, and the overall resistance to deformation of the structure after the reinforcing member 232 and the flange 2312 are connected is high, so as to constrain the deformation of the flange 2312 under stress.

[0128] Please refer to Figure 3 and Figure 5 and further refer to Figure 6 , Figure 6 The diagram illustrates the structure of the first and second conductive elements provided in some embodiments of this application. According to some embodiments of this application, the battery cell 20 further includes an electrode assembly 22 disposed within the housing 21, and the electrode assembly 22 has a tab 22a; the terminal body 231 includes a first conductive element 231a and a second conductive element 231b interconnected, the first conductive element 231a and the second conductive element 231b being stacked along the thickness direction Z of the first wall, the first conductive element 231a being used to connect with a busbar, and the second conductive element 231b being used to connect with the tab 22a; the hardness of the reinforcing member 232 is greater than the hardness of the first conductive element 231a and the hardness of the second conductive element 231b.

[0129] The first conductive element 231a and the second conductive element 231b are two components constituting the terminal body 231. The first conductive element 231a and the second conductive element 231b are electrically connected so that electrical energy can flow between the first conductive element 231a and the second conductive element 231b.

[0130] The first conductive element 231a and the second conductive element 231b are stacked along the thickness direction Z of the first wall. On the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the first conductive element 231a and the orthographic projection of the second conductive element 231b at least partially overlap.

[0131] In some embodiments, the hardness of the first conductive element 231a may be equal to the hardness of the second conductive element 231b, or the hardness of the first conductive element 231a may be less than or greater than the hardness of the second conductive element 231b.

[0132] In some embodiments, the material of the first conductive element 231a may be the same as the material of the second conductive element 231b, or the material of the first conductive element 231a may be the same as the material of the second conductive element 231b.

[0133] Compared to the hardness of the first conductive element 231a and the hardness of the second conductive element 231b, the hardness of the reinforcing element 232 is higher.

[0134] In the above scheme, the first conductive element 231a and the second conductive element 231b are separately arranged. The first conductive element 231a is used to connect with the busbar component, and the second conductive element 231b is used to connect with the tab 22a. The materials of the first conductive element 231a and the second conductive element 231b can be different. The material of the first conductive element 231a can be the same as the material of the busbar component, and the material of the second conductive element 231b can be the same as the material of the tab 22a, so as to facilitate the connection of the first conductive element 231a with the busbar component and the connection of the second conductive element 231b with the tab 22a. The hardness of the reinforcing member 232 is greater than the hardness of the first conductive element 231a and the second conductive element 231b, which can enhance the deformation resistance of the terminal body 231.

[0135] Please refer to Figure 5 and Figure 6 According to some embodiments of this application, the first conductive member 231a includes a first main body portion 2311a and a first flange portion 2312a, the first flange portion 2312a protruding from the periphery of the first main body portion 2311a; the second conductive member 231b includes a second main body portion 2311b and a second flange portion 2312b, the second flange portion 2312b protruding from the periphery of the second main body portion 2311b; the second main body portion 2311b and the first main body portion 2311a constitute the main body portion 2311, and the second flange portion 2312b and the first flange portion 2312a constitute the flange portion 2312. On the same projection plane perpendicular to the thickness direction Z of the first wall, the projection of the first flange portion 2312a and the projection of the second flange portion 2312b at least partially overlap.

[0136] The first main body portion 2311a is used for electrical connection with the busbar component. For example, the first main body portion 2311a can be welded to the busbar component. The first flange portion 2312a protrudes from the outer peripheral surface of the first main body portion 2311a. Along the thickness direction Z of the first wall, the first flange portion 2312a can be located at one end of the first main body portion 2311a near the second conductive member 231b.

[0137] The second main body portion 2311b is used for electrical connection with the electrode tab 22a. For example, the second main body portion 2311b can be directly welded to the electrode tab 22a, or the second main body portion 2311b can be welded with an adapter, which can then be welded to the electrode tab 22a. The second flange portion 2312b protrudes from the outer peripheral surface of the second main body portion 2311b along the thickness direction Z of the first wall, and the second flange portion 2312b can be located at one end of the second main body portion 2311b near the first conductive member 231a.

[0138] Along the thickness direction Z of the first wall, the first main body portion 2311a and the second main body portion 2311b overlap.

[0139] In some embodiments, please refer to Figure 5 Along the thickness direction Z of the first wall, the first conductive element 231a and the second conductive element 231b can be arranged at intervals, and the reinforcing element 232 can be located between the first conductive element 231a and the second conductive element 231b.

[0140] In some embodiments, please refer to Figure 6 Along the thickness direction Z of the first wall, the first conductive element 231a and the second conductive element 231b can be in contact and connected. The reinforcing element 232 can be disposed on the first flange portion 2312a, or the reinforcing element 232 can be disposed on the second flange portion 2312b.

[0141] In some embodiments, please refer to Figure 7 , Figure 7 The diagram below shows the structure of the first conductive member and the second conductive member provided in some other embodiments of this application. Along the thickness direction Z of the first wall, the first main body 2311a and the second main body 2311b can be in contact and connected. The first flange 2312a and the second flange 2312b can be partially spaced apart. The reinforcing member 232 can be located between the first flange 2312a and the second flange 2312b.

[0142] In the above scheme, the first main body portion 2311a and the second main body portion 2311b constitute the main body portion 2311. The first main body portion 2311a is used to connect with the busbar component, and the second main body portion 2311b is used to connect with the electrode tab 22a. The second flange portion 2312b and the first flange portion 2312a constitute the flange portion 2312. The connector 24 and the first wall 21a clamp the first flange portion 2312a and the second flange portion 2312b so as to fix the electrode terminal 23 to the first wall 21a.

[0143] Please refer to Figure 8 , Figure 8 This is a schematic diagram illustrating the assembly of a first conductive member and a second conductive member according to some embodiments of this application. According to some embodiments of this application, the first conductive member 231a may include a first main body portion 2311a and a first flange portion 2312a, with the first flange portion 2312a protruding from the periphery of the first main body portion 2311a; the second conductive member 231b may include a second main body portion 2311b, the second main body portion 2311b and the first main body portion 2311a constituting a main body portion 2311, and the first flange portion 2312a constituting a flange portion 2312. Along the thickness direction Z of the first wall, a reinforcing member 232 may be located on the side of the first flange portion 2312a facing away from the first wall 21a, or the reinforcing member 232 may be located between the first flange portion 2312a and the first wall 21a.

[0144] The first main body portion 2311a and the second main body portion 2311b constitute the main body portion 2311, which facilitates the connection between the electrode terminal 23 and the busbar and the tab 22a; the flange portion 2312 is located on the first conductive member 231a, which facilitates processing and manufacturing, and the flange portion 2312 is firmly connected to the first main body portion 2311a.

[0145] Please refer to Figure 9 , Figure 9 The diagram illustrates the assembly of the first and second conductive elements according to other embodiments of this application. According to some embodiments of this application, the first conductive element 231a may include a first main body portion 2311a, and the second conductive element 231b may include a second main body portion 2311b and a second flange portion 2312b, the second flange portion 2312b protruding from the periphery of the second main body portion 2311b; the second main body portion 2311b and the first main body portion 2311a constitute the main body portion 2311, and the second flange portion 2312b constitutes the flange portion 2312. Along the thickness direction Z of the first wall, a reinforcing portion may be located on the side of the second flange portion 2312b facing away from the first wall 21a, or the reinforcing member 232 may be located between the second flange portion 2312b and the first wall 21a.

[0146] The first main body portion 2311a and the second main body portion 2311b constitute the main body portion 2311, which facilitates the connection between the electrode terminal 23 and the busbar and the tab 22a; the flange portion 2312 is located on the second conductive member 231b, which facilitates processing and manufacturing, and the flange portion 2312 is firmly connected to the second main body portion 2311b.

[0147] According to some embodiments of this application, the materials of the first conductive element 231a and the second conductive element 231b are different.

[0148] In the above scheme, the materials of the first conductive element 231a and the second conductive element 231b are different. On the one hand, the material of the first conductive element 231a can be the same as the material of the busbar component, and the material of the second conductive element 231b can be the same as the material of the tab 22a, so as to realize the connection between the first conductive element 231a and the busbar component and the connection between the second conductive element 231b and the tab 22a; on the other hand, it can also reduce the cost of the electrode terminal 23.

[0149] According to some embodiments of this application, the first conductive element 231a is made of aluminum, and the second conductive element 231b is made of copper.

[0150] In the above scheme, the first conductive component 231a is made of aluminum, which reduces costs and facilitates welding with the busbar component; the second conductive component 231b is made of copper, which facilitates welding with the tab 22a and meets the assembly requirements of the electrode terminal 23 with the busbar component and the tab 22a.

[0151] Please refer to Figure 5 According to some embodiments of this application, the reinforcing member 232 is disposed between the first conductive member 231a and the second conductive member 231b.

[0152] Along the thickness direction Z of the first wall, the first conductive element 231a and the second conductive element 231b are spaced apart, and the reinforcing element 232 is disposed between the first conductive element 231a and the second conductive element 231b. The reinforcing element 232 is a conductive element, and the first conductive element 231a and the second conductive element 231b are electrically connected through the reinforcing element 232.

[0153] In the above scheme, the reinforcing member 232 is disposed between the first conductive member 231a and the second conductive member 231b. The first conductive member 231a and the second conductive member 231b can be electrically connected through the reinforcing member 232. The reinforcing member 232 can improve the overall strength of the terminal body 231, so as to improve the deformation resistance of the electrode terminal 23 and reduce the risk of deformation of the electrode terminal 23 under force.

[0154] Please refer to Figure 4 and further refer to Figure 10 , Figure 10 This is a cross-sectional view of a partial structure of a battery cell provided in some embodiments of this application. According to some embodiments of this application, along the thickness direction Z of the first wall, the reinforcing member 232 is located on the side of the flange portion 2312 opposite to the first wall 21a; or, along the thickness direction Z of the first wall, the reinforcing member 232 is located between the flange portion 2312 and the first wall 21a.

[0155] In an embodiment where the reinforcing member 232 is located away from the first wall 21a on the flange portion 2312, the reinforcing member 232 can be disposed on the flange portion 2312 from the outside to the inside of the first wall 21a.

[0156] In an embodiment where the reinforcing member 232 is located on the flange portion 2312 facing the first wall 21a, the reinforcing member 232 can be disposed on the flange portion 2312 from the inside to the outside of the first wall 21a, so that the reinforcing member 232 is located between the flange portion 2312 and the first wall 21a.

[0157] In the above scheme, the reinforcing member 232 is located on the side of the flange portion 2312 away from the first wall 21a, or the reinforcing member 232 is located on the side of the flange portion 2312 facing the first wall 21a, which facilitates the assembly of the reinforcing member 232 and the terminal body 231.

[0158] According to some embodiments of this application, a groove may be provided on the side of the flange portion 2312 facing away from the first wall 21a, and at least a portion of the reinforcing member 232 may be disposed in the groove; or, a groove may be provided on the side of the flange portion 2312 facing the first wall 21a, and at least a portion of the reinforcing member 232 may be disposed in the groove.

[0159] The groove facilitates the assembly and positioning of the reinforcing member 232 and the flange 2312.

[0160] According to some embodiments of this application, the reinforcement 232 is disposed at least partially around the main body 2311.

[0161] In some embodiments, the reinforcing member 232 may be arc-shaped and disposed around the central axis P of the main body. There may be one or more reinforcing members 232, and multiple reinforcing members 232 may be disposed at intervals around the central axis P of the main body.

[0162] In some embodiments, the reinforcing member 232 may be ring-shaped and sleeved on the outside of the main body portion 2311.

[0163] In the above scheme, the reinforcing member 232 is at least partially arranged around the main body 2311 and can be connected to the flange 2312 at multiple positions in the circumferential direction of the main body 2311, so as to improve the deformation resistance of the flange 2312 at multiple positions in the circumferential direction of the main body 2311 and further reduce the risk of deformation of the flange 2312 under stress.

[0164] According to some embodiments of this application, the material of the reinforcing member 232 is steel, titanium alloy or carbon fiber resin composite material.

[0165] In the above scheme, the material of the reinforcing member 232 is steel, titanium alloy or carbon fiber resin composite material, which has high hardness and good resistance to deformation.

[0166] Please refer to Figures 4 to 10 According to some embodiments of this application, the battery cell 20 further includes a seal 25. Along the thickness direction Z of the first wall, at least a portion of the seal 25 is disposed between the flange 2312 and the first wall 21a, and the seal 25 and the reinforcement 232 at least partially overlap.

[0167] The first wall 21a is provided with an electrode lead-out hole 21b. The main body 2311 and the flange 2312 cooperate to cover the electrode lead-out hole 21b. The sealing member 25 is provided along the circumference of the electrode lead-out hole 21b. The sealing member 25 can be a sealing ring. The sealing member 25 can be elastically deformed so that after the electrode terminal 23 is assembled with the first wall 21a, the sealing member 25 forms a seal between the flange 2312 and the first wall 21a.

[0168] In some embodiments, a portion of the seal 25 may be disposed between the flange 2312 and the first wall 21a, and a portion of the seal 25 may extend into the electrode lead-out hole 21b; or, the entire seal 25 may be disposed between the flange 2312 and the first wall 21a.

[0169] With the thickness direction Z of the first wall as the projection direction, the orthographic projection of the seal 25 and the orthographic projection of the reinforcement 232 at least partially overlap. When the seal 25 applies a force to the flange 2312, the reinforcement 232 can absorb part of the force applied by the seal 25 to the flange 2312, and can play a better constraining role on the flange 2312, so as to reduce the ability of the flange 2312 to deform under stress.

[0170] In the above scheme, at least a portion of the sealing member 25 is disposed between the flange portion 2312 and the first wall 21a to form a sealing structure between the flange portion 2312 and the first wall 21a, thereby reducing the risk of electrode liquid flowing out from the electrode outlet hole 21b; at the same time, the sealing member 25 has the ability to elastically deform, and the sealing member 25 and the reinforcing member 232 at least partially overlap, and the reinforcing member 232 can resist a portion of the force applied by the sealing member 25 to the flange portion 2312, thereby reducing the risk of deformation of the flange portion 2312 under stress.

[0171] Please refer to Figures 4 to 10 According to some embodiments of this application, the battery cell 20 further includes a first insulating member 26, which is at least partially disposed between the electrode terminal 23 and the connector 24, and at least partially surrounds the electrode terminal 23.

[0172] In some embodiments, the connector 24 has a through hole 241, a portion of the first insulating member 26 and a portion of the electrode terminal 23 are accommodated in the through hole 241, and the first insulating member 26 is located between the electrode terminal 23 and the connector 24 along the radial direction of the body portion 2311.

[0173] The first insulating component 26 is an electrical insulating component. The material of the first insulating component 26 can be plastic, rubber, etc., so as to insulate and isolate the electrode terminal 23 and the connector 24.

[0174] The first insulating member 26 is at least partially disposed between the electrode terminal 23 and the connector 24. The first insulating member 26 connects the electrode terminal 23 and the connector 24 to separate the electrode terminal 23 and the connector 24. For example, the first insulating member 26 can be injection molded between the electrode terminal 23 and the connector 24 for easy processing and manufacturing.

[0175] In the above scheme, the first insulating member 26 is disposed between the electrode terminal 23 and the connector 24. The first insulating member 26 is disposed at least partially around the electrode terminal 23, which can separate the electrode terminal 23 and the connector 24 and reduce the risk of short circuit between positive and negative electrodes.

[0176] According to some embodiments of this application, the terminal body 231 further includes a protrusion that protrudes from the periphery of the main body 2311; the first insulating member 26 includes a recess corresponding to the protrusion, and at least a portion of the protrusion is disposed in the recess.

[0177] In some embodiments, there are multiple protrusions, which are spaced apart around the central axis P of the main body; correspondingly, there are multiple recesses, with one protrusion and one recess corresponding to each other.

[0178] According to some embodiments of this application, both the connector 24 and the first insulating member 26 are disposed around the electrode terminal 23.

[0179] The connector 24 is annular, and the inner circumferential surface of the connector 24 forms a through hole 241. The connector 24 is disposed around the main body 2311 so that a portion of the electrode terminal 23 is accommodated in the through hole 241.

[0180] The first insulating member 26 is annular and is arranged around the central axis P of the main body to insulate and isolate the terminal and the connector 24 at any position in the circumferential direction of the electrode terminal 23.

[0181] In the above scheme, the connector 24 is arranged around the electrode terminal 23, which can constrain the electrode terminal 23 at any position in the circumferential direction of the electrode terminal 23; the first insulating member 26 is arranged around the electrode terminal 23, which can separate the electrode terminal 23 and the connector 24 at any position in the circumferential direction of the electrode terminal 23, thereby improving the insulation effect.

[0182] According to some embodiments of this application, the battery cell 20 further includes a second insulating member 27, which is disposed on the side of the first wall 21a facing the electrode assembly 22, so as to isolate the first wall 21a and the conductive components located inside the battery cell 20, thereby reducing the risk of short circuit between the positive and negative electrodes.

[0183] In some embodiments, the connector 24 is welded to the first wall 21a to form a first weld mark 28, and the first weld mark 28 is disposed around the electrode terminal 23.

[0184] The first weld mark 28 is a structure formed after the connector 24 is welded to the first wall 21a. The first weld mark 28 is arranged around the electrode terminal 23. When the connector 24 is welded to the first wall 21a, it can be welded around the electrode terminal 23 to form a ring-shaped first weld mark 28. Welding the connector 24 to the first wall 21a can improve the connection reliability between the connector 24 and the first wall 21a.

[0185] According to some embodiments of this application, this application provides a battery device 100, which includes a battery cell 20 provided according to any of the above embodiments.

[0186] According to some embodiments of this application, this application provides an electrical device that includes a battery device 100 provided according to any of the above embodiments.

[0187] According to some embodiments of this application, please refer to Figures 4 to 10 This application provides a battery cell 20, which includes a housing 21, electrode terminals 23, connectors 24, and a first insulating member 26.

[0188] The housing 21 includes a housing 211 and an end cap 212. The housing 211 has an opening, and the end cap 212 covers the opening. The housing 21 includes a first wall 21a, and the first wall 21a is provided with an electrode lead-out hole 21b.

[0189] Electrode terminal 23 is disposed on the first wall 21a. Electrode terminal 23 includes terminal body 231 and reinforcing member 232. Terminal body 231 includes main body portion 2311 and flange portion 2312 protruding from the periphery of main body portion 2311. Main body portion 2311 and flange portion 2312 cooperate to cover electrode lead hole 21b. A part of main body portion 2311 is disposed in electrode lead hole 21b, and flange portion 2312 is located on the outer side of first wall 21a, which facilitates the assembly and positioning of electrode terminal 23 with first wall 21a.

[0190] The connector 24 is arranged circumferentially around the electrode terminal 23 and is connected to the first wall 21a. At least a portion of the flange portion 2312 is disposed between the first wall 21a and the connector 24 along the thickness direction Z of the first wall. The connector 24 is annular to facilitate fixing the electrode terminal 23 to the first wall 21a.

[0191] A first insulating member 26 is disposed circumferentially around the electrode terminal 23, and at least a portion of the first insulating member 26 is disposed between the electrode terminal 23 and the connector 24. The first insulating member 26 is capable of insulating and isolating the electrode terminal 23 and the connector 24.

[0192] The reinforcing member 232 is connected to the flange portion 2312. The material of the reinforcing member 232 is different from that of the terminal body 231, and the hardness of the reinforcing member 232 is greater than that of the terminal body 231. The reinforcing member 232 has a high resistance to deformation. The connection between the reinforcing member 232 and the flange portion 2312 enhances the overall strength of the structure after the connection between the reinforcing member 232 and the flange portion 2312, thereby giving the structure a high resistance to deformation, reducing the risk of deformation of the flange portion 2312 under stress, and improving the reliability of the battery device 100 composed of the battery cell 20.

[0193] 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 battery cell, characterized in that, include: The outer shell, including the first wall; An electrode terminal is disposed on the first wall. The electrode terminal includes a terminal body, which includes a main body and a flange protruding from the periphery of the main body. A connector is at least partially disposed on the outer periphery of the electrode terminal, the connector is connected to the first wall, and along the thickness direction of the first wall, at least a portion of the flange is disposed between the first wall and the connector, the connector being used to fix the electrode terminal to the first wall; The electrode terminal further includes a reinforcing member connected to the flange portion. The material of the reinforcing member is different from that of the terminal body, and the hardness of the reinforcing member is greater than that of the terminal body.

2. The battery cell according to claim 1, characterized in that, On the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the reinforcing member at least partially overlaps with the orthographic projection of the connecting member.

3. The battery cell according to claim 1, characterized in that, The hardness of the reinforcing member is greater than or equal to 100 kgf / mm². 2 And less than or equal to 500 kgf / mm 2 .

4. The battery cell according to claim 1, characterized in that, The battery cell also includes an electrode assembly disposed within the housing, the electrode assembly having tabs; The terminal body includes a first conductive element and a second conductive element that are connected to each other. The first conductive element and the second conductive element are stacked along the thickness direction of the first wall. The first conductive element is used to connect with the busbar component, and the second conductive element is used to connect with the electrode tab. The hardness of the reinforcing member is greater than the hardness of the first conductive member and the hardness of the second conductive member.

5. The battery cell according to claim 4, characterized in that, The first conductive element includes a first body portion and a first flange portion, the first flange portion protruding from the periphery of the first body portion; the second conductive element includes a second body portion and a second flange portion, the second flange portion protruding from the periphery of the second body portion. The second main body portion and the first main body portion constitute the main body portion, and the second flange portion and the first flange portion constitute the flange portion. On the same projection plane perpendicular to the thickness direction of the first wall, the projection of the first flange portion and the projection of the second flange portion at least partially overlap.

6. The battery cell according to claim 4, characterized in that, The materials of the first conductive element and the second conductive element are different.

7. The battery cell according to claim 6, characterized in that, The first conductive element is made of aluminum, and the second conductive element is made of copper.

8. The battery cell according to any one of claims 4-7, characterized in that, The reinforcing member is disposed between the first conductive member and the second conductive member.

9. The battery cell according to claim 1, characterized in that, Along the thickness direction of the first wall, the reinforcing member is located on the side of the flange portion opposite to the first wall; or, Along the thickness direction of the first wall, the reinforcing member is located between the flange and the first wall.

10. The battery cell according to claim 9, characterized in that, The reinforcing member is disposed at least partially around the main body.

11. The battery cell according to claim 1, characterized in that, The reinforcing member is made of steel, titanium alloy, or carbon fiber resin composite material.

12. The battery cell according to claim 1, characterized in that, The battery cell also includes: A seal, along the thickness direction of the first wall, at least a portion of which is disposed between the flange and the first wall, and the seal at least partially overlaps with the reinforcement.

13. The battery cell according to claim 1, characterized in that, The battery cell also includes: A first insulating member is at least partially disposed between the electrode terminal and the connector, and the first insulating member is at least partially disposed around the electrode terminal.

14. The battery cell according to claim 13, characterized in that, Both the connector and the first insulating member are arranged around the electrode terminal.

15. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-14.

16. An electrical appliance, characterized in that, Includes the battery device as described in claim 15.

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