Battery monomer, battery device, power utilization device and energy storage device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device, a power utilization device and an energy storage device. The battery monomer comprises a shell, an electrode terminal and a first insulating part. The shell comprises a first wall; the electrode terminal is arranged on the first wall and comprises a main body part and a protruding part, and the protruding part protrudes out of the peripheral side of the main body part; the first insulating part is at least partially arranged between the electrode terminal and the first wall, the first insulating part at least partially surrounds the electrode terminal, the first insulating part is provided with a concave part corresponding to the protruding part, and the concave part is matched with the protruding part; and along the thickness direction of the first wall, the protruding part is provided with a first end surface deviating from the interior of the battery monomer, and the first end surface is exposed to the external environment of the battery monomer. According to the technical scheme, the service life of the battery device can be prolonged.

Description

Technical Field

[0001] This application relates to the field of battery device technology, and more specifically, to a battery cell, a battery device, an electrical device, and an energy storage 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 lifespan of the battery is a crucial factor. Therefore, extending the lifespan 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, an electrical device, and an energy storage device, which can extend the service life 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 housing, electrode terminals, and a first insulating member. The housing includes a first wall; the electrode terminals are disposed on the first wall, and each electrode terminal includes a main body portion and a protrusion portion, the protrusion portion protruding from the periphery of the main body portion; the first insulating member is at least partially disposed between the electrode terminals and the first wall, and the first insulating member is at least partially disposed around the electrode terminals, the first insulating member having a recess portion corresponding to the protrusion portion, the recess portion cooperating with the protrusion portion; wherein, along the thickness direction of the first wall, the protrusion portion has a first end face facing away from the interior of the battery cell, the first end face being exposed to the external environment of the battery cell.

[0007] According to the embodiments of this application, the battery cell has a protrusion on the periphery of the main body of the electrode terminal. On the one hand, this enhances the overall strength of the electrode terminal, and on the other hand, it facilitates cooperation with the first insulating member to prevent the electrode terminal from rotating relative to the first wall. Furthermore, the first insulating member does not block the first end face of the protrusion, allowing the first end face of the protrusion to be exposed to the external environment of the battery cell. The electrode terminal can exchange heat with the external environment through the first end face, which increases the heat dissipation area of ​​the electrode terminal, facilitates the reduction of the temperature of the electrode terminal, reduces the influence of the electrode terminal on the internal chemical activity of the battery cell, thereby extending the service life of the battery cell and the service life of the battery device composed of the battery cell.

[0008] According to some embodiments of this application, there are multiple protrusions, which are spaced apart around the central axis of the main body.

[0009] In the above scheme, there are multiple protrusions and correspondingly, there are also multiple recesses. The electrode terminals can cooperate with the first insulating member at multiple positions in the circumferential direction of the main body, which facilitates the improvement of the anti-rotation effect of the first insulating member on the electrode terminals. Furthermore, it can increase the heat dissipation area between the electrode terminals and the external environment, so as to facilitate heat dissipation of the electrode terminals.

[0010] According to some embodiments of this application, the number of protrusions is N, which satisfies 6≤N≤20.

[0011] In the above scheme, the number of protrusions satisfies the above relationship. On the one hand, the electrode terminal and the first insulating member have multiple mating positions, and the first insulating member has a good anti-rotation effect on the electrode terminal. On the other hand, the processing and manufacturing difficulty is low and it is easy to process and manufacture.

[0012] According to some embodiments of this application, the main body includes a first part and a second part distributed sequentially along the thickness direction of the first wall. The first part is farther away from the interior of the battery cell than the second part. The first part is used to connect the current-collecting member. The diameter of the second part is larger than the diameter of the first part. A first stepped surface is formed between the periphery of the second part and the periphery of the first part. A protrusion is disposed on the periphery of the second part.

[0013] In the above scheme, the diameter of the first part is smaller than the diameter of the second part so as to facilitate the connection between the first part and the busbar component; the protrusion is provided on the periphery of the second part so as to facilitate the cooperation between the protrusion and the first insulating component, and at the same time, it can reduce the risk of interference between the protrusion and the assembly of the first part and the busbar component.

[0014] According to some embodiments of this application, the first end face is flush with the first step surface.

[0015] In the above scheme, the first end face is flush with the first step surface, and the first end face can be close to the busbar component so that the heat of the electrode terminal can be transferred to the busbar component.

[0016] According to some embodiments of this application, the electrode terminal further includes a flange portion that protrudes from the periphery of the main body portion and is disposed around the main body portion; along the thickness direction of the first wall, one end of the protrusion portion near the interior of the battery cell is connected to the flange portion.

[0017] In the above scheme, the flange portion facilitates the assembly of the electrode terminal with the first wall. For example, the flange portion can cooperate with the main body portion to cover the electrode lead-out hole on the first wall. The end of the protrusion portion near the inside of the battery cell is connected to the flange portion, which can enhance the overall strength of the electrode terminal and facilitate the improvement of the heat dissipation effect of the electrode terminal.

[0018] According to some embodiments of this application, the first wall includes a wall portion and a connecting portion that are connected to each other. The connecting portion is at least partially disposed around the electrode terminal and is used to fix the electrode terminal to the wall portion. At least a portion of the first insulating member is disposed between the connecting portion and the electrode terminal. Along the thickness direction of the wall portion, at least a portion of the flange portion is located between the wall portion and the connecting portion.

[0019] In the above scheme, the connecting part is at least partially arranged around the electrode terminal, and has a large mating area with the electrode terminal in the circumferential direction of the electrode terminal, so as to fix the electrode terminal to the wall; along the thickness direction of the wall, at least a portion of the flange is arranged between the wall and the connecting part, and the wall and the connecting part cooperate to clamp the flange, which has a good constraint effect on the flange and can restrict the movement of the electrode terminal along the thickness direction of the first wall.

[0020] According to some embodiments of this application, the connecting portion and the wall portion are integrally formed.

[0021] In the above scheme, the connecting part and the wall part are integrally formed, which is convenient for processing and manufacturing, and the connection between the connecting part and the wall part has high stability.

[0022] According to some embodiments of this application, the connecting portion is welded to the wall portion to form a first solder mark, and the first solder mark is disposed around the electrode terminal.

[0023] In the above scheme, welding the connecting part to the wall part can improve the connection stability between the connecting part and the wall part, and the first solder mark is arranged around the electrode terminal to improve the connection reliability between the connecting part and the wall part.

[0024] According to some embodiments of this application, both the connecting portion and the first insulating member are arranged around the electrode terminal.

[0025] In the above scheme, the connecting part 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 connecting part at any position in the circumferential direction of the electrode terminal, thereby improving the insulation effect.

[0026] According to some embodiments of this application, the first insulating member has a second end face that is away from the inner side of the first wall and points outward along the inner side of the first wall, and the second end face is not higher than the first end face.

[0027] In the above scheme, the second end face is not higher than the first end face. On the one hand, this facilitates heat exchange between the protrusion and the external environment, which helps to improve the heat dissipation effect of the electrode terminal. On the other hand, it can reduce the risk of interference between the first insulating component and the busbar component.

[0028] According to some embodiments of this application, the protrusion has a first end and a second end disposed opposite to each other along the circumference of the main body, and the protrusion protrudes from the circumference of the main body by an equal dimension from the first end to the second end.

[0029] In the above scheme, the protrusions protrude from the periphery of the main body with the same size, which facilitates processing and manufacturing. At the same time, the protrusions have a large heat dissipation area, which helps to improve the heat dissipation effect of the electrode terminals.

[0030] According to some embodiments of this application, the protrusion protrudes beyond the periphery of the main body by a dimension M, satisfying 0.3mm≤M≤2mm.

[0031] In the above scheme, the size of the protrusion protruding from the periphery of the main body meets the above range. On the one hand, the protrusion has a certain protrusion size, and the first insulating member has a good anti-rotation effect on the electrode terminal. On the other hand, the protrusion occupies a small assembly space.

[0032] Secondly, embodiments of this application also provide a battery device, which includes a battery cell provided according to any of the above embodiments.

[0033] Thirdly, embodiments of this application also provide an electrical device, which includes a battery device provided according to any of the above embodiments.

[0034] Fourthly, embodiments of this application also provide an energy storage device, which includes a battery device provided according to any of the above embodiments.

[0035] 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

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0038] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0039] Figure 3This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application;

[0040] Figure 4 This is a schematic diagram illustrating the assembly of the electrode terminals with the first wall according to some embodiments of this application;

[0041] Figure 5 for Figure 4 Enlarged view of a portion at point A;

[0042] Figure 6 A perspective view of the electrode terminals provided in some embodiments of this application;

[0043] Figure 7 A perspective view of a first insulating element provided for some embodiments of this application;

[0044] Figure 8 This is a schematic diagram of the structure of the electrode terminals provided in some embodiments of this application.

[0045] Icons: 100 - Battery assembly; 10 - Housing; 11 - First sub-housing; 12 - Second sub-housing; 20 - Battery cell; 21 - Housing; 211 - Shell; 212 - End cap; 213 - First wall; 2131 - Electrode lead-out hole; 213a - Wall portion; 213b - Connecting portion; 214 - First solder mark; 22 - Electrode assembly; 221 - Tab; 23 - Electrode terminal; 231 - Main body portion; 2311 - First part; 2312 - Second part; 2313 - First step surface; 232 - Protrusion; 232a - First end face; 232b - First end; 232c - Second end; 233 - Flange; 24 - First insulating element; 241 - Recess; 242 - Second end face; 25 - Seal; 26 - Adapter; 200 - Controller; 300 - Motor; 1000 - Vehicle; X - Central axis of the main body; Z - Thickness direction of the first wall. Detailed Implementation

[0046] 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.

[0047] 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 foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0048] The terms "first," "second," etc., in the specification, claims, or the accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order or primary / secondary relationship.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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).

[0053] 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.

[0054] 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.

[0055] 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.

[0056] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0057] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] In some embodiments, the energy storage device includes an energy storage enclosure and multiple battery units, with a door on at least one side of the energy storage enclosure. The energy storage device can be an energy storage container, an energy storage cabinet, etc.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.).

[0068] 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.

[0069] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0077] In some implementations, the electrode assembly is a stacked structure.

[0078] 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 made of steel, aluminum, plastic (such as polypropylene), or composite metal (such as a copper-aluminum composite housing).

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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 lifespan of the battery device also needs to be considered.

[0085] In some embodiments, the battery device includes at least one battery cell assembly, which includes multiple battery cells electrically connected to each other via a busbar. During operation, as charging and discharging proceed, the temperature of the electrode terminals tends to rise. This heat can affect the internal chemical activity of the battery cell, potentially disrupting its chemical balance (e.g., electrolyte deterioration and decomposition), leading to a decrease in battery cell capacity and a shortened battery cell lifespan, thereby resulting in a shorter lifespan for the battery device.

[0086] In view of this, to solve the problem of high electrode terminal temperature leading to a short lifespan of the battery cell, this application provides a battery cell including a housing, electrode terminals, and a first insulating member. The housing includes a first wall; the electrode terminals are disposed on the first wall, and each electrode terminal includes a main body portion and a protrusion portion, the protrusion portion protruding from the periphery of the main body portion; the first insulating member is at least partially disposed between the electrode terminals and the first wall, and at least partially surrounds the electrode terminals, the first insulating member having a recess portion corresponding to the protrusion portion, the recess portion cooperating with the protrusion portion; wherein, along the thickness direction of the first wall, the protrusion portion has a first end face facing away from the interior of the battery cell, the first end face being exposed to the external environment of the battery cell. The electrode terminals have good heat dissipation effect, which can extend the lifespan of the battery cell, thereby extending the lifespan of the battery device composed of the battery cell.

[0087] In such a battery cell, a protrusion is provided on the periphery of the main body of the electrode terminal. On the one hand, this enhances the overall strength of the electrode terminal, and on the other hand, it facilitates cooperation with the first insulating member to prevent the electrode terminal from rotating relative to the first wall. Furthermore, the first insulating member does not cover the first end face of the protrusion, allowing the first end face of the protrusion to be exposed to the external environment of the battery cell. The electrode terminal can exchange heat with the external environment through the first end face, which increases the heat dissipation area of ​​the electrode terminal, facilitates the reduction of the temperature of the electrode terminal, reduces the impact of the electrode terminal on the internal chemical activity of the battery cell, thereby extending the service life of the battery cell and the battery device composed of the battery cell.

[0088] The battery device disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using the battery device disclosed in this application.

[0089] 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.

[0090] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel connections. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, 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 configuration to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed configuration 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.

[0096] Please refer to Figure 3 , Figure 3 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. For example... Figure 3 As shown, 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.

[0097] 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.

[0098] 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 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 embodiment does not impose any 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.

[0099] Electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction takes place. 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 plates, and usually a separator is provided between the positive and negative electrode plates to separate the positive and negative electrode plates and prevent internal short circuits between them.

[0100] Please refer to Figure 3 and further refer to Figures 4 to 6 , Figure 4 This is a schematic diagram illustrating the assembly of the electrode terminals with the first wall according to some embodiments of this application. Figure 5 for Figure 4 A magnified view of part A. Figure 6 This is a perspective view of the electrode terminals provided in some embodiments of this application. Figure 7This is a perspective view of a first insulating member provided in some embodiments of this application. Embodiments of this application provide a battery cell 20, which includes a housing 21, electrode terminals 23, and a first insulating member 24. The housing 21 includes a first wall 213; the electrode terminals 23 are disposed on the first wall 213, and each electrode terminal 23 includes a main body portion 231 and a protrusion 232, the protrusion 232 protruding from the periphery of the main body portion 231; the first insulating member 24 is at least partially disposed between the electrode terminals 23 and the first wall 213, and at least partially surrounds the electrode terminals 23. The first insulating member 24 has a recessed portion 241 corresponding to the protrusion 232, the recessed portion 241 engaging with the protrusion 232. Along the thickness direction Z of the first wall, the protrusion 232 has a first end face 232a facing away from the interior of the battery cell 20, the first end face 232a being exposed to the external environment of the battery cell 20.

[0101] In the diagram, the direction indicated by the letter Z is the thickness direction of the first wall.

[0102] The first wall 213 can be an end cap 212, or the first wall 213 can be a wall portion of the housing 211. Optionally, the first wall 213 can be an end cap 212.

[0103] The main body 231 is the part of the electrode terminal 23 used to connect the bus member and the tab 221 so that current can flow between the tab 221 and the bus member.

[0104] In some embodiments, the first wall 213 may be provided with an electrode lead-out hole 2131, which penetrates the first wall 213 along the thickness direction Z. The electrode terminal 23 is electrically connected to the tab 221 of the electrode assembly 22 through the electrode lead-out hole 2131. For example, a portion of the electrode terminal 23 extends into the electrode lead-out hole 2131 to be directly connected to the tab 221, or it is connected to the tab 221 through an adapter 26. For another example, the electrode terminal 23 is located on the outside of the first wall 213, a portion of the adapter 26 extends into the electrode lead-out hole 2131 and is connected to the electrode terminal 23, and the tab 221 is connected to the adapter 26, thereby connecting the electrode terminal 23 and the tab 221 through the adapter 26.

[0105] Electrode terminal 23 includes a positive electrode terminal and a negative electrode terminal. The first wall 213 may be provided with two electrode lead-out holes 2131, with the positive electrode terminal and the negative electrode terminal each corresponding to one electrode lead-out hole 2131. Electrode assembly 22 includes a positive electrode tab and a negative electrode tab. The positive electrode terminal and the positive electrode tab are electrically connected, and the negative electrode terminal and the negative electrode tab are electrically connected.

[0106] In some embodiments, the main body 231 may be cylindrical to facilitate manufacturing.

[0107] The periphery of the main body 231 can be the outer peripheral surface of the main body 231. The main body 231 can include an outer end face and an inner end face. The outer end face is the end face of the main body 231 that is away from the inside of the battery cell 20, and the inner end face is the end face of the main body 231 that is close to the inside of the battery cell 20. The periphery of the main body 231 connects the outer end face and the inner end face.

[0108] "The protrusion 232 protrudes from the periphery of the main body 231" means that the protrusion 232 protrudes from the outer periphery of the main body 231 in a direction away from the central axis X of the main body.

[0109] The first insulating component 24 is a component used to insulate and isolate the electrode terminal 23 and the first wall 213. The material of the first insulating component 24 can be plastic or rubber.

[0110] In some embodiments, a portion of the first insulating member 24 may be located between the electrode terminal 23 and the first wall 213, or all of the first insulating member 24 may be located between the electrode terminal 23 and the first wall 213, so as to separate the electrode terminal 23 and the first wall 213 and reduce the risk of short circuit between the electrode terminal 23 and the first wall 213.

[0111] The first insulating member 24 is at least partially disposed along the circumference of the electrode terminal 23. For example, the first insulating member 24 is at least partially disposed around the central axis X of the main body portion, so as to separate the electrode terminal 23 from the first wall 213 in the circumferential direction of the electrode terminal 23. It should be noted that the central axis X of the main body portion can be the central axis of the electrode terminal 23.

[0112] The recess 241 can be a groove provided in the first insulating member 24, or the recess 241 can be provided on the inner peripheral surface of the first insulating member 24 to facilitate the engagement of the first insulating member 24 with the protrusion 232. The contour of the recess 241 matches the contour of the protrusion 232, and at least a portion of the protrusion 232 extends into the recess 241 to achieve the engagement of the protrusion 232 and the recess 241. The first insulating member 24 can restrict the electrode terminal 23 from rotating relative to the first wall 213 about the central axis X of the main body.

[0113] The first end face 232a is the end face of the protrusion 232 that is away from the interior of the battery cell 20.

[0114] When the first insulating member 24 is assembled with the electrode terminal 23, the recessed portion 241 and the protruding portion 232 cooperate, and the first end face 232a is not blocked by the first insulating member 24, so that the first end face 232a is exposed to the external environment of the battery cell 20. When the battery cell 20 is working, since the first end face 232a is exposed to the external environment of the battery cell 20, the first end face 232a serves as the heat dissipation surface of the electrode terminal 23, and some of the heat from the electrode terminal 23 can be dissipated to the external environment through the first end face 232a.

[0115] According to the battery cell 20 of this application embodiment, a protrusion 232 is provided on the periphery of the main body portion 231 of the electrode terminal 23. On the one hand, this enhances the overall strength of the electrode terminal 23, and on the other hand, it facilitates cooperation with the first insulating member 24 to prevent the electrode terminal 23 from rotating relative to the first wall 213. In addition, the first insulating member 24 does not block the first end face 232a of the protrusion 232, so that the first end face 232a of the protrusion 232 is exposed to the external environment of the battery cell 20. The electrode terminal 23 can exchange heat with the external environment through the first end face 232a, which can increase the heat dissipation area of ​​the electrode terminal 23, facilitate the reduction of the temperature of the electrode terminal 23, reduce the influence of the electrode terminal 23 on the internal chemical activity of the battery cell 20, thereby extending the service life of the battery cell 20 and the service life of the battery device 100 composed of the battery cell 20.

[0116] Please refer to Figure 5 and Figure 6 According to some embodiments of this application, there are multiple protrusions 232, and the multiple protrusions 232 are arranged at intervals around the central axis X of the main body.

[0117] Multiple protrusions 232 are spaced apart around the central axis X of the main body, and the multiple protrusions 232 can be spaced apart circumferentially along the electrode terminal 23.

[0118] Please refer to Figures 5 to 7 There are multiple recesses 241, and each recess 241 is correspondingly provided with a protrusion 232, with one recess 241 cooperating with one protrusion 232.

[0119] In some embodiments, a plurality of protrusions 232 are arranged at equal intervals around the central axis X of the main body to facilitate manufacturing. Meanwhile, the first insulating member 24 has a good anti-rotation restriction effect on the electrode terminal 23.

[0120] In the above scheme, there are multiple protrusions 232, and correspondingly, there are also multiple recesses 241. The electrode terminal 23 can cooperate with the first insulating member 24 at multiple positions in the circumferential direction of the main body 231, which facilitates the improvement of the anti-rotation effect of the first insulating member 24 on the electrode terminal 23. Furthermore, it can increase the heat dissipation area between the electrode terminal 23 and the external environment, so as to facilitate heat dissipation of the electrode terminal 23.

[0121] According to some embodiments of this application, the number of protrusions 232 is N, satisfying 6≤N≤20.

[0122] In some embodiments, the number N of protrusions 232 can be 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20.

[0123] In the above scheme, the number of protrusions 232 satisfies the above relationship. On the one hand, when the number N of protrusions 232 is greater than or equal to 6, the electrode terminal 23 and the first insulating member 24 have multiple mating positions, and the first insulating member 24 has a good anti-rotation effect on the electrode terminal 23. On the other hand, when the number N of protrusions 232 is less than or equal to 20, the processing and manufacturing difficulty is lower and it is easier to process and manufacture.

[0124] Please refer to Figure 5 and Figure 6 According to some embodiments of this application, the main body 231 includes a first part 2311 and a second part 2312 distributed sequentially along the thickness direction Z of the first wall. The first part 2311 is farther away from the interior of the battery cell 20 relative to the second part 2312. The first part 2311 is used to connect the current-collecting member. The diameter of the second part 2312 is larger than the diameter of the first part 2311. A first stepped surface 2313 is formed between the periphery of the second part 2312 and the periphery of the first part 2311. A protrusion 232 is disposed on the periphery of the second part 2312.

[0125] The first part 2311 and the second part 2312 are both distributed on the outside of the first wall 213. The principle of the first part 2311 is that the surface of the second part 2312 is used to connect with the busbar to output or input electrical energy.

[0126] The diameter of the second part 2312 is larger than the diameter of the first part 2311. The outer peripheral surface of the second part 2312 is farther away from the central axis X of the main body relative to the outer peripheral surface of the first part 2311, so that a first stepped surface 2313 is formed between the peripheral side of the second part 2312 and the peripheral side of the first part 2311. The first stepped surface 2313 connects the outer peripheral surfaces of the first part 2311 and the second part 2312. After the first part 2311 is assembled with the busbar component, there can be a gap between the first stepped surface 2313 and the busbar component.

[0127] The protrusion 232 is provided on the outer peripheral surface of the second part 2312. The protrusion 232 is away from the central axis X of the main body to facilitate the engagement of the protrusion 232 with the first insulating member 24. At the same time, when the first part 2311 is assembled with the busbar component, the risk of interference of the protrusion 232 with the busbar component can be reduced.

[0128] In the above scheme, the diameter of the first part 2311 is smaller than the diameter of the second part 2312, so as to facilitate the connection between the first part 2311 and the busbar component; the protrusion 232 is provided on the periphery of the second part 2312, so as to facilitate the cooperation between the protrusion 232 and the first insulating member 24, and at the same time, it can reduce the risk of interference between the protrusion 232 and the assembly of the first part 2311 and the busbar component.

[0129] In some embodiments, the first portion 2311 and the second portion 2312 may both be cylindrical, with the diameter of the second portion 2312 being larger than the diameter of the first portion 2311. In other embodiments, the first portion 2311 and the second portion 2312 may both be prisms, with the diameter of the circumcircle of the second portion 2312 being larger than the diameter of the circumcircle of the first portion 2311.

[0130] Please refer to Figure 5 and Figure 6 According to some embodiments of this application, the first end face 232a is flush with the first step face 2313.

[0131] Along the inner side of the first wall 213 pointing outward, the first end face 232a is flush with the first step surface 2313. It should be noted that the first end face 232a is flush with the first step surface 2313, but not absolutely flush; a certain amount of machining error is permissible.

[0132] In the above scheme, the first end face 232a is flush with the first step surface 2313, and the first end face 232a can be close to the busbar component so that the heat of the electrode terminal 23 can be transferred to the busbar component.

[0133] Please refer to Figure 5 and Figure 6 According to some embodiments of this application, the electrode terminal 23 further includes a flange portion 233, which protrudes from the periphery of the main body portion 231 and is disposed around the main body portion 231; along the thickness direction Z of the first wall, one end of the protrusion 232 near the interior of the battery cell 20 is connected to the flange portion 233.

[0134] The flange portion 233 protrudes from the outer peripheral surface of the main body portion 231. The flange portion 233 is disposed around the central axis X of the main body portion, and the flange portion 233 is disposed around the circumference of the main body portion 231. The flange portion 233 cooperates with the main body portion 231 to cover the electrode lead-out hole 2131 disposed on the first wall 213, so as to facilitate the assembly of the electrode terminal 23 with the first wall 213.

[0135] The flange portion 233 and the protrusion portion 232 are arranged sequentially in the thickness direction Z of the first wall, and the protrusion portion 232 is farther away from the interior of the battery cell 20 relative to the flange portion 233.

[0136] In the above scheme, the flange portion 233 facilitates the assembly of the electrode terminal 23 with the first wall 213. For example, the flange portion 233 can cooperate with the main body portion 231 to cover the electrode lead-out hole 2131 on the first wall 213. The end of the protrusion portion 232 near the inside of the battery cell 20 is connected to the flange portion 233, which can enhance the overall strength of the electrode terminal 23 and facilitate the improvement of the heat dissipation effect of the electrode terminal 23.

[0137] In some other embodiments, the protrusion 232 may be spaced apart from the flange 233 in the thickness direction Z of the first wall.

[0138] Please refer to Figure 5 According to some embodiments of this application, the first wall 213 includes a wall portion 213a and a connecting portion 213b connected to each other. The connecting portion 213b is at least partially disposed around the electrode terminal 23 and is used to fix the electrode terminal 23 to the wall portion 213a. At least a portion of the first insulating member 24 is disposed between the connecting portion 213b and the electrode terminal 23. Along the thickness direction of the wall portion 213a, at least a portion of the flange portion 233 is located between the wall portion 213a and the connecting portion 213b.

[0139] The wall portion 213a and the connecting portion 213b are two parts of the first wall 213. The wall portion 213a can be the base of the first wall 213, and the connecting portion 213b can be a component for fixing the electrode terminal 23 to the wall portion 213a. The thickness direction of the wall portion is parallel to the thickness direction Z of the first wall.

[0140] The connecting part 213b can be integrally formed with the wall part 213a, or the connecting part 213b can be welded to the wall part 213a.

[0141] The wall portion 213a is provided with an electrode lead-out hole 2131. When the electrode terminal 23 is assembled with the first wall 213, the electrode terminal 23 is positioned through the electrode lead-out hole 2131, and the connecting portion 213b fixes the electrode terminal 23 to the wall portion 213a.

[0142] The connecting portion 213b may be in the form of a ring arranged around the circumference of the electrode terminal 23, or the connecting portion 213b may have an arc surface extending along the circumference of the electrode terminal 23, so that the connecting portion 213b can have a large mating area with the electrode terminal 23 in the circumference of the electrode terminal 23.

[0143] The thickness direction of the wall portion 213a is parallel to the thickness direction Z of the first wall.

[0144] Along the thickness direction of the wall portion 213a, a portion of the flange portion 233 may be disposed between the wall portion 213a and the connecting portion 213b, or the entire flange portion 233 may be disposed between the wall portion 213a and the connecting portion 213b. The connecting portion 213b can cooperate with the wall portion 213a to clamp the flange portion 233, so that the connecting portion 213b can fix the flange portion 233 to the wall portion 213a.

[0145] In the above scheme, the connecting portion 213b is at least partially arranged around the electrode terminal 23, and has a large mating area with the electrode terminal 23 in the circumferential direction, so as to fix the electrode terminal 23 to the wall portion 213a; along the thickness direction of the wall portion 213a, at least a portion of the flange portion 233 is disposed between the wall portion 213a and the connecting portion 213b, and the wall portion 213a and the connecting portion 213b cooperate to clamp the flange portion 233, which has a good constraint effect on the flange portion 233 and can restrict the electrode terminal 23 from moving along the thickness direction Z of the first wall.

[0146] In some embodiments, the battery cell 20 further includes a seal 25 disposed around the electrode lead-out hole 2131. Along the thickness direction of the wall portion 213a, at least a portion of the seal 25 is located between the flange portion 233 and the wall portion 213a to achieve a sealing fit between the flange portion 233 and the wall portion 213a.

[0147] According to some embodiments of this application, the connecting portion 213b and the wall portion 213a are integrally formed.

[0148] The connecting portion 213b can be a component formed on the side of the wall portion 213a away from the inside of the battery cell 20. The connecting portion 213b and the wall portion 213a can be integrally formed by casting, stamping or milling.

[0149] When the electrode terminal 23 is assembled with the first wall 213, after the electrode terminal 23 engages with the electrode lead-out hole 2131 provided in the wall portion 213a, the connecting portion 213b is bent and engages with the wall portion 213a to clamp the flange portion 233, so as to fix the electrode terminal 23 to the wall portion 213a.

[0150] In the above scheme, the connecting part 213b and the wall part 213a are integrally formed, which is convenient for processing and manufacturing, and the connection stability between the connecting part 213b and the wall part 213a is high.

[0151] Please refer to Figure 5 According to some embodiments of this application, the connecting portion 213b is welded to the wall portion 213a to form a first solder mark 214, and the first solder mark 214 is disposed around the electrode terminal 23.

[0152] The connecting part 213b and the wall part 213a are separately provided. The connecting part 213b can be annular. Along the radial direction of the connecting part 213b, one end of the connecting part 213b is welded to the wall part 213a, and the other end of the connecting part 213b is used to cooperate with the wall part 213a to clamp the flange part 233.

[0153] The first solder mark 214 is a structure formed by welding the connecting part 213b and the wall part 213a. When welding the connecting part 213b and the wall part 213a, the connecting part 213b and the wall part 213a are welded around the circumference of the electrode terminal 23 to form a ring-shaped first solder mark 214.

[0154] In the above scheme, welding the connecting part 213b to the wall part 213a can improve the connection stability between the connecting part 213b and the wall part 213a, and the first solder mark 214 is arranged around the electrode terminal 23, which can improve the connection reliability between the connecting part 213b and the wall part 213a.

[0155] Please refer to Figure 5 According to some embodiments of this application, the connecting portion 213b and the first insulating member 24 are both disposed around the electrode terminal 23.

[0156] The connecting portion 213b can be a ring-shaped structure around the central axis of the electrode terminal 23, and the first insulating member 24 can be a ring-shaped structure around the central axis of the electrode terminal 23. Furthermore, the first insulating member 24 is located between the connecting portion 213b and the electrode terminal 23 to facilitate the insulation separation of the connecting portion 213b and the electrode terminal 23.

[0157] In some embodiments, the first insulating member 24 may be injection molded between the connecting portion 213b and the electrode terminal 23.

[0158] In the above scheme, the connecting part 213b 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 24 is arranged around the electrode terminal 23, which can separate the electrode terminal 23 and the connecting part 213b at any position in the circumferential direction of the electrode terminal 23, thereby improving the insulation effect.

[0159] Please refer to Figure 5 and Figure 7 According to some embodiments of this application, the first insulating member 24 has a second end face 242 located away from the inner side of the first wall 213, pointing outward along the inner side of the first wall 213, and the second end face 242 is not higher than the first end face 232a.

[0160] The inner side of the first wall 213 refers to the side of the first wall 213 facing the inside of the battery cell 20, and the outer side of the first wall 213 refers to the side of the first wall 213 away from the inside of the battery cell 20.

[0161] Along the direction from the inside to the outside of the first wall 213, the second end face 242 is the end face of the first insulating member 24 that is away from the inside of the first wall 213. The second end face 242 is further away from the inside of the battery cell 20 than other positions of the first insulating member 24.

[0162] Along the inner side of the first wall 213 pointing outwards, the second end face 242 can be flush with the first end face 232a, or the second end face 242 can be lower than the first end face 232a. When the second end face 242 is flush with the first end face 232a, the first insulating member 24 has a better insulation effect on the protrusion 232, reducing the risk of short circuit due to contact between the protrusion 232 and other components. When the second end face 242 is lower than the first end face 232a, the protrusion 232 has a larger exposed area and a larger contact area with the external environment, which facilitates heat dissipation of the electrode unit.

[0163] In the above scheme, the second end face 242 is not higher than the first end face 232a. On the one hand, it facilitates heat exchange between the protrusion 232 and the external environment, and improves the heat dissipation effect of the electrode terminal 23. On the other hand, it can reduce the risk of interference between the first insulating member 24 and the busbar component.

[0164] Please refer to Figure 8 , Figure 8 This is a schematic diagram of the structure of an electrode terminal provided in some embodiments of this application. According to some embodiments of this application, the protrusion 232 has a first end 232b and a second end 232c disposed opposite to each other in the circumferential direction along the main body 231. From the first end 232b to the second end 232c, the protrusion 232 protrudes from the circumferential side of the main body 231 by equal dimensions.

[0165] The first end 232b and the second end 232c are two ends of the main body 231 that are arranged opposite each other along the circumference of the main body 231.

[0166] The protrusion height of the protrusion 232 is defined as the dimension by which the protrusion 232 extends beyond the periphery of the main body 231. Along the circumference of the main body 231, the protrusion height of the protrusion 232 is equal at any position from the first end 232b to the second end 232c. For example, the main body 231 may be cylindrical, and the outer peripheral surface of the protrusion 232 may be an arc surface, parallel to the outer peripheral surface of the main body 231. Alternatively, the main body 231 may be cuboid, and the protrusion 232 may also be cuboid, with its outer peripheral surface being a plane, parallel to the outer peripheral surface of the main body 231.

[0167] In the above scheme, the protrusion 232 protrudes from the periphery of the main body 231 by the same size, which is convenient for processing and manufacturing. At the same time, the protrusion 232 has a large heat dissipation area, which can improve the heat dissipation effect of the electrode terminal 23.

[0168] According to some embodiments of this application, the protrusion 232 protrudes from the periphery of the main body 231 by a dimension M, satisfying 0.3mm≤M≤2mm.

[0169] In some embodiments, the dimension M of the protrusion 232 protruding from the periphery of the main body 231 can be any one of 0.3mm, 0.4mm, 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, or 2mm, or a range between any two.

[0170] In the above scheme, the size of the protrusion 232 protruding from the periphery of the main body 231 meets the above range. On the one hand, when the size M of the protrusion 232 protruding from the periphery of the main body 231 is greater than or equal to 0.3 mm, the protrusion 232 has a certain protrusion size, and the first insulating member 24 has a good anti-rotation effect on the electrode terminal 23. On the other hand, when the size M of the protrusion 232 protruding from the periphery of the main body 231 is less than or equal to 2 mm, the protrusion 232 occupies a smaller assembly space.

[0171] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 provided according to any of the above embodiments.

[0172] According to some embodiments of this application, this application also provides an electrical device that includes a battery device 100 provided according to any of the above embodiments.

[0173] According to some embodiments of this application, this application also provides an energy storage device, which includes a battery device 100 provided according to any of the above embodiments.

[0174] According to some embodiments of this application, please refer to the figures. This application provides a battery cell 20, which includes a housing 21, electrode terminals 23 and a first insulating member 24.

[0175] The outer casing 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 end cap 212 is a first wall 213. The first wall 213 includes a wall portion 213a and a connecting portion 213b. The wall portion 213a is provided with an electrode lead-out hole 2131, and the connecting portion 213b is connected to the wall portion 213a.

[0176] Electrode terminals 23 are disposed on the first wall 213. Each electrode terminal 23 includes a main body 231, a protrusion 232, and a flange 233. The main body 231 corresponds to the electrode lead-out hole 2131. Both the protrusion 232 and the flange 233 protrude from the periphery of the main body 231 and are located on the outer side of the wall 213a. The protrusion 232 is farther from the interior of the battery cell 20 relative to the flange 233. Along the thickness direction Z of the first wall, the protrusion 232 connects to the flange 233. The main body 231 and the flange 233 cooperate to cover the electrode lead-out hole 2131. Multiple protrusions 232 are provided at intervals around the central axis X of the main body. The provision of the protrusions 232 enhances the overall strength of the electrode terminal 23.

[0177] The first insulating member 24 is at least partially disposed between the electrode terminal 23 and the first wall 213, and the first insulating member 24 is disposed around the electrode terminal 23. The first insulating member 24 has a recessed portion 241 corresponding to the protrusion 232, a portion of the protrusion 232 extending into the recessed portion 241, and the recessed portion 241 cooperates with the protrusion 232 to restrict the rotation of the electrode terminal 23 relative to the first wall 213.

[0178] Along the thickness direction Z of the first wall, the protrusion 232 has a first end face 232a facing away from the interior of the battery cell 20, and the first end face 232a is exposed to the external environment of the battery cell 20. The first insulating member 24 does not block the first end face 232a of the protrusion 232, so that the first end face 232a of the protrusion 232 is exposed to the external environment of the battery cell 20. The electrode terminal 23 can exchange heat with the external environment through the first end face 232a, which can increase the heat dissipation area of ​​the electrode terminal 23, facilitate the reduction of the temperature of the electrode terminal 23, reduce the influence of the electrode terminal 23 on the chemical activity inside the battery cell 20, thereby extending the service life of the battery cell 20 and the battery device 100 composed of the battery cell 20.

[0179] 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 main body and a protrusion, the protrusion protruding from the periphery of the main body. A first insulating member is at least partially disposed between the electrode terminal and the first wall, and the first insulating member is at least partially disposed around the electrode terminal. The first insulating member has a recessed portion corresponding to the protrusion, and the recessed portion cooperates with the protrusion. Wherein, along the thickness direction of the first wall, the protrusion has a first end face facing away from the interior of the battery cell, and the first end face is exposed to the external environment of the battery cell.

2. The battery cell according to claim 1, characterized in that, The number of protrusions is multiple, and the multiple protrusions are spaced apart around the central axis of the main body.

3. The battery cell according to claim 2, characterized in that, The number of protrusions is N, which satisfies 6≤N≤20.

4. The battery cell according to claim 1, characterized in that, The main body includes a first part and a second part distributed sequentially along the thickness direction of the first wall. The first part is farther away from the interior of the battery cell relative to the second part. The first part is used to connect a current-collecting component. The diameter of the second part is larger than the diameter of the first part. A first stepped surface is formed between the periphery of the second part and the periphery of the first part. The protrusion is disposed on the periphery of the second part.

5. The battery cell according to claim 4, characterized in that, The first end face is flush with the first step surface.

6. The battery cell according to claim 1, characterized in that, The electrode terminal further includes a flange portion that protrudes from the periphery of the main body portion and is disposed around the main body portion; Along the thickness direction of the first wall, one end of the protrusion near the interior of the battery cell is connected to the flange.

7. The battery cell according to claim 6, characterized in that The first wall includes a wall portion and a connecting portion that are connected to each other. The connecting portion is at least partially disposed around the electrode terminal and is used to fix the electrode terminal to the wall portion. At least a portion of the first insulating member is disposed between the connecting portion and the electrode terminal. Along the thickness direction of the wall portion, at least a portion of the flange portion is located between the wall portion and the connecting portion.

8. The battery cell according to claim 7, characterized in that, The connecting part is integrally formed with the wall part.

9. The battery cell according to claim 7, characterized in that, The connecting portion is welded to the wall portion to form a first weld mark, and the first weld mark is disposed around the electrode terminal.

10. The battery cell according to claim 7, characterized in that, Both the connecting portion and the first insulating member are arranged around the electrode terminal.

11. The battery cell according to claim 1, characterized in that, The first insulating member has a second end face away from the inner side of the first wall, pointing outward along the inner side of the first wall, and the second end face is not higher than the first end face.

12. The battery cell according to claim 1, characterized in that, The protrusion has a first end and a second end that are arranged opposite each other along the circumference of the main body, and the protrusion protrudes from the circumference of the main body by an equal dimension from the first end to the second end.

13. The battery cell according to claim 1, characterized in that, The protrusion protrudes beyond the periphery of the main body by a dimension M, satisfying 0.3mm≤M≤2mm.

14. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-13.

15. An electrical appliance, characterized in that, Includes the battery device as described in claim 14.

16. An energy storage device, characterized in that, Includes the battery device as described in claim 14.

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