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. The battery cell includes a housing and an electrode terminal. The shell comprises a first wall; the electrode terminal is arranged on the first wall and comprises a main body part and a flange part protruding out of the peripheral side of the main body part; the electrode terminal further comprises a protruding part, the protruding part protrudes out of the peripheral side of the main body part, the protruding part is connected with the flange part in the thickness direction of the first wall, and a first reinforcing part is arranged at the joint of the protruding part and the flange part. According to the technical scheme, the reliability of the battery monomer can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery devices, and in particular to a battery cell, a battery device, and an electrical device. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0003] During the manufacturing process of battery devices, the reliability of the battery device is an issue that cannot be ignored. Therefore, how to improve the reliability of the battery device is a technical problem that needs to be solved urgently in battery technology. Utility Model Content

[0004] The present application provides a battery cell, a battery device, and an electrical device, which can improve the reliability of the battery cell.

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

[0006] In a first aspect, embodiments of the present application provide a battery cell comprising a housing and an electrode terminal. The housing comprises a first wall; the electrode terminal is disposed on the first wall and comprises a main body and a flange protruding from a peripheral side of the main body; the electrode terminal further comprises a protrusion protruding from a peripheral side of the main body and connected to the flange along the thickness direction of the first wall. A first reinforcement portion is disposed at the connection between the protrusion and the flange.

[0007] According to the battery cell of the embodiment of the present application, the protrusion protrudes from the peripheral side of the main body to facilitate the cooperation of the electrode terminal with other components; a first reinforcing portion is provided at the connection between the protrusion and the flange portion, which can improve the strength of the connection between the protrusion and the flange portion. When the electrode assembly is subjected to external force, the stress at the connection between the protrusion and the flange portion can be dispersed, the stress concentration at the connection between the protrusion and the flange portion can be reduced, the risk of bending of the flange portion and the risk of cracking at the connection between the protrusion and the flange portion can be reduced, the reliability of the battery cell is improved, and thus the reliability of the battery device is improved.

[0008] According to some embodiments of the present application, the battery cell further includes a sealing member, and at least a portion of the sealing member is disposed between the flange portion and the first wall along a thickness direction of the first wall.

[0009] In the above solution, the provision of the sealing member can improve the sealing effect between the flange portion and the first wall, and reduce the risk of substances (such as electrolyte) flowing between the flange portion and the first wall.

[0010] According to some embodiments of the present application, on the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first reinforcement portion and the orthographic projection of the sealing member at least partially overlap.

[0011] In the above scheme, the orthographic projection of the first reinforcement portion at least partially overlaps with the orthographic projection of the seal, and the first reinforcement portion can absorb the force of the seal on the electrode terminal to disperse the stress at the connection between the protrusion and the flange portion, reduce the risk of bending of the flange portion, and reduce the risk of cracking at the connection between the protrusion and the flange portion.

[0012] According to some embodiments of the present application, the battery cell also includes a first insulating member, at least a portion of which is arranged between the electrode terminal and the first wall, and the first insulating member is at least partially arranged around the electrode terminal, and the first insulating member includes a recessed portion corresponding to the protrusion, and the recessed portion cooperates with the protrusion.

[0013] In the above solution, the provision of the first insulating member can separate the electrode terminal from the first wall, and the recessed portion cooperates with the protruding portion to limit the rotation of the electrode terminal relative to the first wall, thereby facilitating assembly of the electrode terminal and the first wall.

[0014] According to some embodiments of the present application, the first wall includes a wall portion and a connecting portion that are interconnected, the connecting portion is at least partially arranged around the electrode terminal, the connecting portion is used to fix the electrode terminal to the wall portion, and at least a portion of the first insulating member is arranged 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 arranged between the wall portion and the connecting portion.

[0015] In the above scheme, the connecting portion is at least partially arranged around the electrode terminal, and has a larger matching area with the electrode terminal in the circumferential direction of the electrode terminal, so as to facilitate fixing the electrode terminal to the wall portion; along the thickness direction of the wall portion, at least a portion of the flange portion is arranged between the wall portion and the connecting portion, and the wall portion and the connecting portion cooperate to clamp the flange portion, which has a better restraining effect on the flange portion.

[0016] According to some embodiments of the present application, the minimum distance between the first reinforcement portion and the connecting portion is W, satisfying 0.2 mm ≤ W ≤ 5 mm.

[0017] In the above solution, the minimum distance between the first reinforcement portion and the connecting portion satisfies the above relationship. While satisfying the insulation separation requirement of the first insulating member for the connecting portion and the first reinforcement portion, the assembled structure of the connecting portion and the electrode terminal occupies a smaller assembly space.

[0018] According to some embodiments of the present application, on the same projection plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the connecting portion and the orthographic projection of the sealing member at least partially overlap.

[0019] In the above scheme, the orthographic projection of the connecting portion at least partially overlaps with the orthographic projection of the sealing member. The connecting portion cooperates with the wall portion to absorb the force of the sealing member acting on the electrode terminal in the thickness direction of the wall portion and disperse the stress at the connection between the protrusion and the flange portion.

[0020] According to some embodiments of the present application, the connecting portion includes a first section, the first section is located on the outside of the wall portion, and the flange portion is located between the first section and the wall portion along the thickness direction of the wall portion.

[0021] In the above solution, the first section is located outside the wall portion, and the flange portion is located between the first section and the wall portion, which facilitates assembly of the electrode terminal with the first wall.

[0022] According to some embodiments of the present application, on the same projection plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the first segment and the orthographic projection of the sealing member at least partially overlap.

[0023] In the above solution, the orthographic projection of the first section at least partially overlaps with the orthographic projection of the seal, and the first section has a good restraining effect on the flange portion, so as to absorb the force of the seal acting on the electrode terminal in the thickness direction of the wall portion.

[0024] According to some embodiments of the present application, the first section has a first surface facing the flange portion and a second surface facing the main body portion, and the first surface and the second surface are connected by a first chamfered surface.

[0025] In the above scheme, the protrusion protrudes from the outside of the main body, the first section is closer to the protrusion than other parts of the connecting part, the connection between the first surface and the second surface is the area of ​​the connecting part closest to the protrusion, and the setting of the first chamfered surface, while meeting the requirement of the first insulating part for insulating and separating the protrusion and the connecting part, the first section can be set toward the main body, thereby reducing the space occupied after the connecting part and the electrode terminal are assembled.

[0026] According to some embodiments of the present application, the connecting portion and the wall portion are integrally formed.

[0027] In the above solution, the connecting portion and the wall portion are integrally formed, which is convenient for processing and manufacturing, and the connection stability between the connecting portion and the wall portion is high.

[0028] According to some embodiments of the present application, the connecting portion and the wall portion are welded to form a first weld mark, and the first weld mark is arranged around the electrode terminal.

[0029] In the above solution, the connecting portion is welded to the wall portion to improve the connection stability between the connecting portion and the wall portion, and the first weld mark is arranged around the electrode terminal to improve the connection reliability between the connecting portion and the wall portion.

[0030] According to some embodiments of the present application, the connecting portion and the first insulating member are both arranged around the electrode terminal.

[0031] In the above scheme, the connecting portion is arranged around the electrode terminal, and 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, and can separate the electrode terminal and the connecting portion at any position in the circumferential direction of the electrode terminal, thereby improving the insulation effect.

[0032] According to some embodiments of the present application, the flange portion has a third surface facing away from the wall portion, and a fourth surface facing away from the main body portion, and the third surface and the fourth surface are connected by a second chamfered surface.

[0033] In the above solution, while the connection portion remains unchanged and the insulation requirements of the first insulating member are met, the flange portion can be increased in protrusion from the main portion, shortening the distance between the electrode terminal and the connection portion. This can increase the flow area of ​​the electrode terminal and improve the flow capacity of the electrode terminal. While the flange portion remains unchanged in protrusion from the main portion and the insulation requirements of the first insulating member are met, the distance between the connection portion and the electrode terminal can be shortened, reducing the space occupied by the assembled structure of the connection portion and the electrode terminal.

[0034] According to some embodiments of the present application, there are multiple protrusions, and the multiple protrusions are arranged at intervals around the central axis of the main body.

[0035] In the above solution, there are multiple protrusions to facilitate assembly with other components at multiple positions in the circumferential direction of the electrode terminal, thereby improving the assembly stability of the electrode terminal and the first wall.

[0036] According to some embodiments of the present application, a second reinforcement portion is provided at the connection between the main body portion and the flange portion.

[0037] In the above solution, the provision of the second reinforcement portion can disperse the stress on the electrode terminal, reduce the risk of bending of the flange portion, and reduce the risk of cracking at the connection between the main body portion and the flange portion.

[0038] In a second aspect, an embodiment of the present application further provides a battery device, which includes a battery cell provided according to any of the above embodiments.

[0039] In a third aspect, an embodiment of the present application further provides an electrical device, which includes a battery cell or a battery device provided according to any of the above embodiments, and the battery cell or the battery device is used to provide electrical energy.

[0040] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] 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 creative work.

[0042] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0043] Figure 2 A schematic diagram of the structural decomposition of a battery device provided in some embodiments of the present application;

[0044] Figure 3 A schematic diagram of the structural decomposition of a battery cell provided in some embodiments of the present application;

[0045] Figure 4 A cross-sectional view of a portion of the structure of a battery cell provided in some embodiments of the present application;

[0046] Figure 5 for Figure 4 A local enlarged view of point A;

[0047] Figure 6 for Figure 5 A partial enlarged view of point B;

[0048] Figure 7 A schematic diagram of the structure of electrode terminals provided in some embodiments of the present application;

[0049] Figure 8 A schematic structural diagram of a first insulating member provided in some embodiments of the present application;

[0050] Figure 9 Cross-sectional views of partial structures of battery cells provided in some other embodiments of the present application;

[0051] Figure 10 A cross-sectional view of a portion of the structure of a battery cell provided in some embodiments of the present application.

[0052] Icons: 100 - battery device; 10 - battery cell; 11 - housing; 111 - housing; 112 - end cap; 113 - first wall; 114 - electrode lead-out hole; 115 - wall portion; 116 - connection portion; 1161 - first section; 1161a - first surface; 1161b - second surface; 1162 - second section; 1163 - third section; 1164 - first chamfered surface; 117 - first weld mark; 118 - groove; 12 - electrode assembly; 121 - tab; 13 - electrode terminal; 131 - main body; 131 a-first end face; 131b-second end face; 132-flange portion; 1321-third surface; 1322-fourth surface; 1323-second chamfered surface; 133-projection; 134-first reinforcement portion; 135-second reinforcement portion; 14-adapter; 15-sealing member; 16-first insulating member; 161-recessed portion; 20-box; 21-first sub-box; 22-second sub-box; 200-controller; 300-motor; 1000-vehicle; Q-central axis of the main body; Z-thickness direction of the first wall. DETAILED DESCRIPTION

[0053] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0055] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0056] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0057] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0058] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0059] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0060] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0061] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0062] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0063] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0064] As an example, the housing may include a first sub-housing and a second sub-housing. The first and second sub-housings snap together to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first sub-housing may be a top cover or a bottom plate.

[0065] As an example, the box may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the box to accommodate the battery cell assembly.

[0066] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0067] In some embodiments, the battery device refers to an energy storage device, which includes a box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0068] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0069] The battery cells may be, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, and the like.

[0070] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0071] 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.

[0072] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0073] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium with a silver-plated surface may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0074] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0075] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0076] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be silver-plated aluminum, silver-plated stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium.

[0077] In some embodiments, the negative electrode current collector has two opposite surfaces in its 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.

[0078] As an example, the negative electrode active material may be a negative electrode active material for a battery that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0079] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0080] As an example, the primary material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0081] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0082] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0083] In some embodiments, the electrode assembly is a laminate structure.

[0084] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0085] In some embodiments, the housing includes an end cap and a shell. The shell has an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly, electrolyte, and other substances. The shell may have one or more openings. One or more end caps may also be provided.

[0086] In some embodiments, the housing is provided with at least one electrode terminal, which is electrically connected to a tab of the electrode assembly. The electrode terminal may be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal may be provided on an end cap or on the housing.

[0087] In some embodiments, the housing is provided with an explosion-proof valve for releasing the internal pressure of the battery cell.

[0088] In some embodiments, the housing can be a sealed structure or a non-sealed structure. For example, when the housing is a sealed structure, the housing can protect the electrode assembly and prevent leakage of electrolyte. When the housing is a non-sealed structure, the housing can also protect the electrode assembly. A sealing bag can 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 member or an aluminum-plastic film.

[0089] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. Prismatic battery cells include square-shell battery cells, blade-shaped battery cells, and polygonal prismatic batteries. Polygonal prismatic batteries are, for example, hexagonal prismatic batteries.

[0090] The development of battery technology must consider multiple design factors simultaneously, such as performance parameters such as energy density, discharge capacity, charge and discharge rate, and the reliability of the battery device must also be considered.

[0091] In some embodiments, the battery includes a shell and an electrode terminal, and the electrode terminal is arranged in the shell, for example, the electrode terminal is arranged in the end cover of the shell. The electrode terminal includes a main body and a flange portion protruding from the circumference of the main body, the main body is used to electrically connect to the busbar externally, the main body is used to electrically connect to the tab internally, and the flange portion is used to assemble with the shell (such as the end cover, etc.). In order to facilitate the assembly of the electrode terminal with other components (such as insulating parts, etc.), for example, the anti-rotation fit of the electrode terminal and the insulating part, the electrode terminal also includes a protrusion, which protrudes from the circumference of the main body. When the electrode terminal is subjected to external force (such as the tension of the busbar, the force of the sealing part, etc.), stress concentration is likely to occur at the connection between the protrusion and the flange, causing the flange to bend. In severe cases, the connection between the protrusion and the flange is cracked, which makes the reliability of the battery cell low.

[0092] In view of this, in order to solve the problem of low reliability of the battery cell caused by stress concentration at the connection between the protrusion and the flange, resulting in bending of the flange and cracking at the connection between the protrusion and the flange, the embodiments of the present application provide a battery cell comprising a housing and an electrode terminal, wherein the housing comprises a first wall; the electrode terminal is disposed on the first wall, and the electrode terminal comprises a main body and a flange protruding from the circumference of the main body; wherein the electrode terminal further comprises a protrusion, which protrudes from the circumference of the main body and is connected to the flange along the thickness direction of the first wall, and a first reinforcement portion is provided at the connection between the protrusion and the flange. The first reinforcement portion strengthens the connection between the protrusion and the flange, thereby ensuring high reliability of the battery cell and improving the reliability of the battery device.

[0093] In such a battery cell, the protrusion protrudes from the periphery of the main body to facilitate the mating of the electrode terminal with other components. A first reinforcement portion is provided at the junction of the protrusion and the flange, thereby increasing the strength of the connection between the protrusion and the flange, and providing a high degree of deformation resistance. When the electrode assembly is subjected to external forces, the stress at the connection between the protrusion and the flange is dispersed, reducing stress concentration at the connection, lowering the risk of flange bending, and lowering the risk of cracking at the connection between the protrusion and the flange, thereby improving the reliability of the battery cell and, consequently, the reliability of the battery device.

[0094] The battery cells and battery devices disclosed in the embodiments of the present application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. The battery cells and battery devices disclosed in the present application can be used to form a power supply system for the electrical device.

[0095] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0096] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0097] Please refer to Figure 1 , Figure 1 Schematic diagram of the structure of the vehicle provided for some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can be used as an operating power source for the vehicle 1000 and for the circuit system of the vehicle 1000, such as for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0098] The vehicle 1000 may further 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, to meet the power requirements of the vehicle 1000 during startup, navigation, and driving.

[0099] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0100] Please refer to Figure 2 , Figure 2Schematic diagram of the structural decomposition of a battery device provided in some embodiments of the present application. The battery device 100 includes a battery cell 10 and a case 20, wherein the battery cell 10 is accommodated in the case 20. The case 20 is used to provide a storage space for the battery cell 10, and the case 20 can adopt a variety of structures. In some embodiments, the case 20 can include a first sub-case 21 and a second sub-case 22, the first sub-case 21 and the second sub-case 22 covering each other, and the first sub-case 21 and the second sub-case 22 jointly define a storage space for accommodating the battery cell 10. The second sub-case 22 can be a hollow structure with one end open, and the first sub-case 21 can be a plate-shaped structure, and the first sub-case 21 covers the open side of the second sub-case 22, so that the first sub-case 21 and the second sub-case 22 jointly define a storage space; the first sub-case 21 and the second sub-case 22 can also be hollow structures with one side open, and the open side of the first sub-case 21 covers the open side of the second sub-case 22.

[0101] In the battery device 100, there may be multiple battery cells 10, and the multiple battery cells 10 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 10. The multiple battery cells 10 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit 10 may be housed within the housing 20. Of course, the battery device 100 may also be a battery module formed by first connecting multiple battery cells 10 in series, in parallel, or in a hybrid connection, and then the multiple battery modules are further connected in series, in parallel, or in a hybrid connection to form an entire battery unit, which is then housed within the housing 20. The battery device 100 may also include other structures, for example, the battery device 100 may further include a busbar component for electrically connecting the multiple battery cells 10.

[0102] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application. Figure 3 As shown, the battery cell 10 includes a housing 11, an electrode assembly 12, electrode terminals 13, and other functional components. The housing 11 includes a shell 111 and an end cap 112. The shell 111 has an opening, and the end cap 112 closes the opening to isolate the internal environment of the battery cell 10 from the external environment.

[0103] The housing 111 is a component used to cooperate with the end cap 112 to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly 12, electrolyte, and other components. The housing 111 and the end cap 112 can be independent components. The housing 111 can be of various shapes and sizes. Specifically, the shape of the housing 111 can be determined according to the specific shape and size of the electrode assembly 12. The material of the housing 111 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0104] The end cap 112 refers to a component that covers the opening of the shell 111 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cap 112 can be adapted to the shape of the shell 111 to match the shell 111. Optionally, the end cap 112 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 112 is not easily deformed when squeezed or collided, so that the battery cell 10 can have a higher structural strength and the reliability can also be improved. Functional components such as electrode terminals 13 and pressure relief mechanisms can be provided on the end cap 112. The electrode terminal 13 can be used to electrically connect to the electrode assembly 12 for outputting or inputting electrical energy of the battery cell 10. The material of the end cap 112 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 112 to isolate the electrical connection components in the housing 111 from the end cap 112 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, or the like.

[0105] The electrode assembly 12 is a component in the battery cell 10 where electrochemical reactions occur. One or more electrode assemblies 12 may be contained in the housing 111. The electrode assembly 12 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The separator is used to separate the positive and negative electrode sheets to avoid internal short circuits between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 12, and the parts of the positive and negative electrode sheets without active materials each constitute a tab. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body.

[0106] Please refer to Figure 3 , and further reference Figures 4 to 7 , Figure 4 A cross-sectional view of a portion of the structure of a battery cell provided in some embodiments of the present application, Figure 5 for Figure 4 A partial enlarged view of point A, Figure 6 for Figure 5 A partial enlarged view of point B, Figure 7Schematic diagram of the structure of the electrode terminal provided for some embodiments of the present application. The embodiment of the present application provides a battery cell 10, which includes a shell 11 and an electrode terminal 13. The shell 11 includes a first wall 113, and the electrode terminal 13 is arranged on the first wall 113. The electrode terminal 13 includes a main body 131 and a flange portion 132 protruding from the circumference of the main body 131. Among them, the electrode terminal 13 also includes a protrusion 133, the protrusion 133 protrudes from the circumference of the main body 131, and along the thickness direction Z of the first wall, the protrusion 133 is connected to the flange portion 132, and a first reinforcement portion 134 is provided at the connection between the protrusion 133 and the flange portion 132.

[0107] The first wall 113 may be a wall of the housing 111 or the end cover 112 . According to different design requirements, the first wall 113 may be a different part of the housing 11 .

[0108] Optionally, the first wall 113 is an end cover 112 , which facilitates assembly of the electrode terminal 13 and the first wall 113 .

[0109] In some embodiments, the battery cell 10 further includes an electrode assembly 12, which is disposed in the housing 11. The electrode assembly 12 may be a wound structure or a laminated structure.

[0110] In some embodiments, the battery cell 10 may be a square battery cell 10 . For example, the electrode assembly 12 may be flat, and the thickness direction of the electrode assembly 12 may be perpendicular to the thickness direction Z of the first wall.

[0111] The electrode terminal 13 is used to output or input electrical energy of the battery cell 10 , wherein the protrusion 133 is electrically connected to an external conductive member (such as a busbar component) externally and is electrically connected to the tab 121 of the electrode assembly 12 internally.

[0112] The flange portion 132 protrudes from the peripheral surface of the main body portion 131 (i.e., the peripheral surface of the main body portion 131). The main body portion 131 includes a first end surface 131a and a second end surface 131b. The first end surface 131a is the end surface of the main body portion 131 facing away from the interior of the battery cell 10, and the second end surface 131b is the end surface of the main body portion 131 facing the interior of the battery cell 10. The peripheral surface of the main body portion 131 connects the first end surface 131a and the second end surface 131b. Along the thickness direction Z of the first wall, the flange portion 132 is located between the first end surface 131a and the second end surface 131b. The flange portion 132 can extend in a direction away from the central axis Q of the main body portion, and the central axis Q of the main body portion can be parallel to the thickness direction Z of the first wall.

[0113] In some embodiments, the first wall 113 may be provided with an electrode lead-out hole 114. The electrode lead-out hole 114 may penetrate the first wall 113 along the thickness direction Z of the first wall. The main body 131 and the flange 132 cooperate to cover the electrode lead-out hole 114. The main body 131 is electrically connected to the tab 121 through the electrode lead-out hole 114. For example, a portion of the main body 131 may extend into the electrode lead-out hole 114 to connect directly to the tab 121 or to connect through the adapter 14. Alternatively, a portion of the adapter 14 may extend into the electrode lead-out hole 114 and electrically connect to the main body 131, thereby achieving electrical connection between the electrode terminal 13 and the tab 121 through the adapter 14.

[0114] The protrusion 133 can be a limiting structure arranged on the peripheral side of the main body 131 to facilitate assembly with other components. For example, the protrusion 133 can cooperate with the insulating member to limit the electrode terminal 13 from rotating around the central axis Q of the main body relative to the first wall 113.

[0115] The phrase "the protrusion 133 is connected to the flange portion 132 along the thickness direction Z of the first wall" means that the protrusion 133 extends toward the flange portion 132 and is connected to the flange portion 132 along the thickness direction Z of the first wall. Alternatively, it can be understood that the protrusion 133 extends from the flange portion 132 along the thickness direction Z of the first wall, so that the structure formed by the protrusion 133 and the flange portion 132 has a high overall strength.

[0116] In some embodiments, the main body 131 , the flange 132 , the protruding portion 133 , and the first reinforcing portion 134 are integrally formed, so that the electrode terminal 13 has a high overall strength and is easy to process and manufacture.

[0117] The first reinforcement portion 134 is arranged at the connection between the protrusion 133 and the flange portion 132. The first reinforcement portion 134 connects the protrusion 133 and the flange portion 132, further improving the overall strength of the structure formed by the protrusion 133 and the flange portion 132, that is, strengthening the strength of the connection between the protrusion 133 and the flange portion 132.

[0118] According to the battery cell 10 of the embodiment of the present application, the protrusion 133 protrudes from the circumferential side of the main body 131 to facilitate the cooperation of the electrode terminal 13 with other components; a first reinforcement portion 134 is provided at the connection between the protrusion 133 and the flange portion 132, which can improve the strength of the connection between the protrusion 133 and the flange portion 132. When the electrode assembly 12 is subjected to external force, the stress at the connection between the protrusion 133 and the flange portion 132 can be dispersed, the stress concentration at the connection between the protrusion 133 and the flange portion 132 can be reduced, the risk of bending of the flange portion 132 and the risk of cracking at the connection between the protrusion 133 and the flange portion 132 can be reduced, and the reliability of the battery cell 10 can be improved.

[0119] According to some embodiments of the present application, when viewed along the thickness direction Z of the first wall, the orthographic projection of the protrusion 133 falls within the orthographic projection of the flange portion 132 .

[0120] For example, the dimension between the surface of the protrusion 133 away from the main body 131 and the central axis Q of the main body is smaller than the dimension between the outer peripheral surface of the flange 132 and the central axis Q of the main body.

[0121] In the above solution, the protrusion 133 occupies a smaller space in a plane perpendicular to the central axis Q of the main body, so that the protrusion 133 occupies a smaller space after being assembled with other components.

[0122] Please refer to Figure 6 and Figure 7 According to some embodiments of the present application, the battery cell 10 further includes a seal 15 , and along the thickness direction Z of the first wall, at least a portion of the seal 15 is disposed between the flange portion 132 and the first wall 113 .

[0123] In some embodiments, along the thickness direction Z of the first wall, a portion of the seal 15 is disposed between the flange portion 132 and the first wall 113 , or the entire seal 15 is disposed between the flange portion 132 and the first wall 113 .

[0124] In an embodiment where the first wall 113 is provided with an electrode lead-out hole 114 , the seal 15 is provided around the electrode lead-out hole 114 , and the flange portion 132 is sealed with the first wall 113 through the seal 15 to achieve sealing of the electrode lead-out hole 114 .

[0125] In the above scheme, the setting of the seal 15 can improve the sealing effect between the flange portion 132 and the first wall 113, reduce the risk of substances (such as electrolyte) flowing between the flange portion 132 and the first wall 113, for example, reduce the risk of electrolyte flowing out of the electrode lead-out hole 114 leaking between the flange portion 132 and the first wall 113.

[0126] Please refer to Figure 5 and Figure 6 According to some embodiments of the present application, on the same projection plane perpendicular to the thickness direction Z of the first wall, the orthographic projection of the first reinforcement portion 134 and the orthographic projection of the sealing member 15 at least partially overlap.

[0127] When viewed along the thickness direction Z of the first wall, the orthographic projection of the first reinforcement portion 134 may partially overlap with the orthographic projection of the sealing member 15 , or the orthographic projection of the first reinforcement portion 134 may completely overlap with the orthographic projection of the sealing member 15 .

[0128] After the battery cell 10 is assembled, the seal 15 is compressed and deformed to form a sealing surface between the flange portion 132 and the first wall 113. The seal 15 exerts a reaction force on the flange portion 132. In other words, the connection between the protrusion 133 and the flange portion 132 is subjected to the force from the seal 15. The provision of the first reinforcing portion 134 can enhance the overall strength of the connection between the protrusion 133 and the flange portion 132, thereby enhancing the ability of the connection between the protrusion 133 and the flange portion 132 to resist the force applied by the seal 15.

[0129] In the above scheme, the orthographic projection of the first reinforcement portion 134 at least partially overlaps with the orthographic projection of the seal 15. The first reinforcement portion 134 can absorb the force of the seal 15 on the electrode terminal 13 to disperse the stress at the connection between the protrusion 133 and the flange portion 132, reduce the risk of bending of the flange portion 132, and reduce the risk of cracking at the connection between the protrusion 133 and the flange portion 132.

[0130] Please refer to Figure 5 and Figure 6 , and further reference Figure 8 , Figure 8 Schematic diagram of the structure of a first insulating member provided in some embodiments of the present application. According to some embodiments of the present application, the battery cell 10 further includes a first insulating member 16. At least a portion of the first insulating member 16 is disposed between the electrode terminal 13 and the first wall 113. The first insulating member 16 at least partially surrounds the electrode terminal 13. The first insulating member 16 includes a recessed portion 161 corresponding to the protrusion 133, and the recessed portion 161 cooperates with the protrusion 133.

[0131] The first insulating member 16 is a component used to insulate and isolate the electrode terminal 13 from the first wall 113 . The first insulating member 16 may be made of plastic or rubber.

[0132] The first insulating member 16 is at least partially disposed between the electrode terminal 13 and the first wall 113, and the first insulating member 16 at least partially surrounds the electrode terminal 13 to separate the electrode terminal 13 from the first wall 113. For example, a portion of the first insulating member 16 is disposed between the electrode terminal 13 and the first wall 113, and the first insulating member 16 is disposed in a circle or a portion around the central axis Q of the main body; for another example, the entire first insulating member 16 is disposed between the electrode terminal 13 and the first wall 113, and the first insulating member 16 is disposed in a circle or a portion around the central axis Q of the main body.

[0133] The recess 161 may be a groove formed on the surface of the first insulating member 16 facing the main body 131 . The profile of the recess 161 matches the profile of the protrusion 133 so that at least a portion of the protrusion 133 can be embedded in the recess 161 .

[0134] When the first insulating member 16 is assembled with the electrode terminal 13 , a portion of the protrusion 133 may be embedded in the recess 161 , or the entire protrusion 133 may be embedded in the recess 161 .

[0135] In the above solution, the provision of the first insulating member 16 can separate the electrode terminal 13 from the first wall 113 , and the recessed portion 161 cooperates with the protruding portion 133 to limit the rotation of the electrode terminal 13 relative to the first wall 113 , thereby facilitating the assembly of the electrode terminal 13 and the first wall 113 .

[0136] In some embodiments, the first insulating member 16 may be connected to the electrode terminal 13 by heat-fusion, so as to improve the connection stability between the first insulating member 16 and the electrode terminal 13 .

[0137] Please refer to Figure 5 and Figure 6 According to some embodiments of the present application, the first wall 113 includes a wall portion 115 and a connecting portion 116 that are interconnected. The connecting portion 116 is at least partially arranged around the electrode terminal 13. The connecting portion 116 is used to fix the electrode terminal 13 to the wall portion 115. At least a portion of the first insulating member 16 is arranged between the connecting portion 116 and the electrode terminal 13; along the thickness direction of the wall portion 115, at least a portion of the flange portion 132 is arranged between the wall portion 115 and the connecting portion 116.

[0138] The wall portion 115 and the connecting portion 116 are two parts that constitute the first wall 113. The wall portion 115 can be the base of the first wall 113, and the connecting portion 116 can be a component used to fix the electrode terminal 13 to the wall portion 115. The connecting portion 116 can be integrally formed with the wall portion 115, or the connecting portion 116 can be welded to the wall portion 115.

[0139] The connecting portion 116 may be annular and disposed around the circumference of the electrode terminal 13, or may have an arcuate surface disposed around the circumference of the electrode terminal 13, so that the connecting portion 116 can have a larger mating area with the electrode terminal 13 in the circumferential direction of the electrode terminal 13. The circumferential direction of the electrode terminal 13 may be a direction around the central axis of the electrode terminal 13, and the central axis Q of the main body is the central axis of the electrode terminal 13.

[0140] The thickness direction of the wall portion 115 is parallel to the thickness direction Z of the first wall.

[0141] Along the thickness direction of the wall portion 115 , at least a portion of the flange portion 132 is arranged between the wall portion 115 and the connecting portion 116 . The connecting portion 116 can cooperate with the wall portion 115 to clamp the flange portion 132 , so that the connecting portion 116 fixes the flange portion 132 to the wall portion 115 .

[0142] In the above scheme, the connecting portion 116 is arranged at least partially around the electrode terminal 13, and has a large matching area with the electrode terminal 13 in the circumferential direction of the electrode terminal 13, so as to facilitate fixing the electrode terminal 13 to the wall portion 115; along the thickness direction of the wall portion 115, at least a portion of the flange portion 132 is arranged between the wall portion 115 and the connecting portion 116, and the wall portion 115 and the connecting portion 116 cooperate to clamp the flange portion 132, which has a better restraining effect on the flange portion 132.

[0143] Please refer to Figure 5 and Figure 6 According to some embodiments of the present application, the minimum distance between the first reinforcement portion 134 and the connecting portion 116 is W, satisfying 0.2 mm ≤ W ≤ 5 mm.

[0144] The minimum distance between the first reinforcement portion 134 and the connecting portion 116 refers to the minimum value of the distances between the first reinforcement portion 134 and the connecting portion 116 in any direction. For example, when the first reinforcement portion 134 has a chamfered structure, the first reinforcement portion 134 has an outer peripheral surface facing away from the main body portion 131. In a cross section parallel to and passing through the central axis Q of the main body portion, the minimum distance between the outer peripheral surface and the connecting portion 116 in a direction perpendicular to the outer peripheral surface can be the minimum distance between the first reinforcement portion 134 and the connecting portion 116.

[0145] For example, the minimum distance W between the first reinforcement portion 134 and the connecting portion 116 can be any point value among 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.4mm, 3.6mm, 3.8mm, 4mm, 4.2mm, 4.4mm, 4.6mm, 4.8mm, 5mm, or the range between any two point values.

[0146] In some embodiments, the space between the first reinforcing portion 134 and the connecting portion 116 may be filled with the first insulating member 16 to facilitate separation of the first reinforcing portion 134 and the connecting portion 116 .

[0147] In the above embodiment, when W ≥ 0.2 mm, the first insulating member 16 has a certain thickness to meet the insulation and separation requirements of the first insulating member 16 between the connecting portion 116 and the first reinforcing portion 134. When W ≤ 5 mm, the assembled structure of the connecting portion 116 and the electrode terminal 13 occupies a small assembly space. Therefore, the minimum distance between the first reinforcing portion 134 and the connecting portion 116 satisfies the above relationship. While the insulation and separation requirements of the first insulating member 16 between the connecting portion 116 and the first reinforcing portion 134 are met, the assembled structure of the connecting portion 116 and the electrode terminal 13 occupies a small assembly space.

[0148] Please refer to Figure 6 According to some embodiments of the present application, on the same projection plane perpendicular to the thickness direction of the wall portion 115 , the orthographic projection of the connecting portion 116 and the orthographic projection of the sealing member 15 at least partially overlap.

[0149] When observed along the thickness direction of the wall portion 115, the orthographic projection of the connecting portion 116 partially overlaps with the orthographic projection of the seal 15, or the orthographic projection of the connecting portion 116 completely overlaps with the orthographic projection of the seal 15, so that the connecting portion 116 and the wall portion 115 cooperate to clamp the flange portion 132 and the seal 15, so as to absorb the force acting on the flange portion 132 by the seal 15 through the connecting portion 116 and the wall portion 115.

[0150] In the above scheme, the orthographic projection of the connecting portion 116 at least partially overlaps with the orthographic projection of the sealing member 15. The connecting portion 116 cooperates with the wall portion 115 to absorb the force of the sealing member 15 acting on the electrode terminal 13 in the thickness direction of the wall portion 115, disperse the stress at the connection between the protrusion 133 and the flange portion 132, reduce the risk of deformation of the flange portion 132, and reduce the risk of cracking at the connection between the protrusion 133 and the flange portion 132.

[0151] In some embodiments, the flange portion 132 may be located on the inner side of the wall portion 115 or on the outer side of the wall portion 115 .

[0152] Optionally, the flange portion 132 is located outside the wall portion 115 to facilitate assembly of the electrode terminal 13 with the first wall 113 .

[0153] Please refer to Figure 6 According to some embodiments of the present application, the connecting portion 116 includes a first section 1161 , which is located on the outside of the wall portion 115 , and the flange portion 132 is located between the first section 1161 and the wall portion 115 along the thickness direction of the wall portion 115 .

[0154] The flange portion 132 is located outside the wall portion 115 , and the first section 1161 is located outside the wall portion 115 , so that the first section 1161 cooperates with the wall portion 115 to clamp the first insulating member 16 , the flange portion 132 and the sealing member 15 .

[0155] The first section 1161 is a portion of the connecting portion 116 facing away from the wall portion 115 . The first section 1161 may be parallel to the wall portion 115 , or an extension plane of the first section 1161 may intersect with the wall portion 115 .

[0156] In some embodiments, the connecting portion 116 also includes a second section 1162 and a third section 1163, the second section 1162 is connected to the wall portion 115, and the third section 1163 connects the first section 1161 and the second section 1162, so that the connecting portion 116 forms a step on the outside of the wall portion 115, and the connecting portion 116 and the wall portion 115 form a space to accommodate the flange portion 132, so that a portion of the flange portion 132 can be located in the space.

[0157] In the above solution, the first section 1161 is located outside the wall portion 115 , and the flange portion 132 is located between the first section 1161 and the wall portion 115 , which facilitates assembly of the electrode terminal 13 with the first wall 113 .

[0158] Please refer to Figure 6 According to some embodiments of the present application, on the same projection plane perpendicular to the thickness direction of the wall portion 115 , the orthographic projection of the first segment 1161 and the orthographic projection of the sealing member 15 at least partially overlap.

[0159] Along the thickness direction of the wall portion 115 , the orthographic projection of the first segment 1161 partially overlaps with the orthographic projection of the sealing member 15 , or the orthographic projection of the first segment 1161 partially overlaps with the orthographic projection of the sealing member 15 .

[0160] In some embodiments, the thickness of the first section 1161 may be smaller than the thickness of other parts of the connecting portion 116 , so that after the connecting portion 116 is assembled with the electrode terminal 13 , the connecting portion 116 occupies a smaller assembly space in the thickness direction of the wall portion 115 .

[0161] In the above scheme, the orthographic projection of the first section 1161 at least partially overlaps with the orthographic projection of the seal 15, and the first section 1161 has a good restraining effect on the flange portion 132, so as to absorb the force of the seal 15 acting on the electrode terminal 13 in the thickness direction of the wall portion 115.

[0162] Please refer to Figure 9 , Figure 9Cross-sectional views of a portion of a battery cell according to some other embodiments of the present application. According to some embodiments of the present application, the first segment 1161 has a first surface 1161a facing the flange portion 132 and a second surface 1161b facing the main body portion 131 , with the first surface 1161a and the second surface 1161b connected by a first chamfered surface 1164 .

[0163] The first chamfered surface 1164 is a surface formed after the first surface 1161a and the second surface 1161b are chamfered. For example, the intersection of the first surface 1161a and the second surface 1161b is chamfered at 45°, or the first surface 1161a and the second surface 1161b are transitioned into an arc.

[0164] In the above scheme, the protrusion 133 protrudes from the outside of the main body 131, and the first section 1161 is closer to the protrusion 133 than other parts of the connecting portion 116. The connection between the first surface 1161a and the second surface 1161b is the area of ​​the connecting portion 116 closest to the protrusion 133. The setting of the first chamfered surface 1164, on the one hand, can reduce the distance between the first section 1161 and the first reinforcement 134 while satisfying the insulating function of the first insulating member 16, and can reduce the space occupied by the structure after the connecting portion 116 and the electrode terminal 13 are assembled; on the other hand, when the assembly structure of the connecting portion 116 and the electrode terminal 13 remains unchanged, the distance between the connecting portion 116 and the electrode terminal 13 is larger, and the thickness of the first insulating member 16 can be thicker, which can improve the insulating effect of the first insulating member 16 on the connecting portion 116 and the electrode terminal 13.

[0165] According to some embodiments of the present application, the connecting portion 116 and the wall portion 115 are integrally formed.

[0166] The connecting portion 116 and the wall portion 115 may be structures manufactured through an integral molding process, such as casting, stamping, or milling.

[0167] In the above solution, the connection portion 116 and the wall portion 115 are integrally formed, which is convenient for processing and manufacturing. The connection stability between the connection portion 116 and the wall portion 115 is high, which can improve the assembly stability of the connection portion 116 and the electrode terminal 13.

[0168] Please refer to Figure 5 and Figure 6 According to some embodiments of the present application, the connection portion 116 is welded to the wall portion 115 to form a first weld mark 117 , and the first weld mark 117 is arranged around the electrode terminal 13 .

[0169] In some embodiments, the first weld mark 117 can be referred to as a weld formed by welding the connection portion 116 to the wall portion 115. The connection portion 116 and the wall portion 115 are connected by welding so that the connection portion 116 and the wall portion 115 are firmly connected. For example, the connection portion 116 and the wall portion 115 can be connected by laser welding.

[0170] When the connection portion 116 is assembled with the wall portion 115 , a circle of welding may be performed around the circumference of the electrode terminal 13 , so that the first weld mark 117 is disposed around the electrode terminal 13 .

[0171] In the above solution, the connection portion 116 is welded to the wall portion 115 to improve the connection stability between the connection portion 116 and the wall portion 115 . The first weld mark 117 is arranged around the electrode terminal 13 to improve the connection reliability between the connection portion 116 and the wall portion 115 .

[0172] Please refer to Figure 5 and Figure 8 According to some embodiments of the present application, the connecting portion 116 and the first insulating member 16 are both disposed around the electrode terminal 13 .

[0173] The connecting portion 116 may be an annular structure surrounding the central axis of the electrode terminal 13 . The connecting portion 116 may have a through hole, and a portion of the electrode terminal 13 may be disposed in the through hole.

[0174] The first insulating member 16 may be an annular structure surrounding the central axis of the electrode terminal 13 , and the first insulating member 16 is located between the connecting portion 116 and the electrode terminal 13 to separate the connecting portion 116 and the electrode terminal 13 .

[0175] In the above scheme, the connecting portion 116 is arranged around the electrode terminal 13, and can constrain the electrode terminal 13 at any position in the circumferential direction of the electrode terminal 13; the first insulating member 16 is arranged around the electrode terminal 13, and can separate the electrode terminal 13 and the connecting portion 116 at any position in the circumferential direction of the electrode terminal 13, thereby improving the insulation effect.

[0176] Please refer to Figure 10 , Figure 10 A cross-sectional view of a portion of a battery cell according to some embodiments of the present application. According to some embodiments of the present application, the flange portion 132 has a third surface 1321 facing away from the wall portion 115 and a fourth surface 1322 facing away from the main body portion 131 . The third surface 1321 and the fourth surface 1322 are connected by a second chamfered surface 1323 .

[0177] In some embodiments, on the same projection plane perpendicular to the thickness direction of the wall portion 115 , the orthographic projection of the first reinforcing portion 134 falls within the orthographic projection of the flange portion 132 .

[0178] The third surface 1321 is the surface of the flange portion 132 away from the wall portion 115 in the thickness direction of the wall portion 115. The fourth surface 1322 is the surface of the flange portion 132 away from the central axis Q of the main body portion (see Figure 5 ) surface.

[0179] The second chamfered surface 1323 is a surface formed after the third surface 1321 and the fourth surface 1322 are chamfered. For example, the intersection of the third surface 1321 and the fourth surface 1322 is chamfered at 45°, or the third surface 1321 and the fourth surface 1322 are transitioned into an arc.

[0180] In the above solution, while the connection portion 116 remains unchanged and the insulation requirements of the first insulating member 16 are met, the protrusion of the flange portion 132 from the main portion 131 can be increased, shortening the distance between the electrode terminal 13 and the connection portion 116. This can increase the flow area of ​​the electrode terminal 13 and improve the flow capacity of the electrode terminal 13. While the protrusion of the flange portion 132 from the main portion 131 remains unchanged and the insulation requirements of the first insulating member 16 are met, the distance between the connection portion 116 and the electrode terminal 13 can be shortened, reducing the space occupied by the assembled structure of the connection portion 116 and the electrode terminal 13.

[0181] According to some embodiments of the present application, the flange portion 132 and the connecting portion 116 are both located on the outside of the wall portion 115. While meeting the insulation requirements of the first insulating member 16, the surface of the connecting portion 116 facing away from the wall portion 115 in the direction pointing outward along the inner side of the wall portion 115 may not exceed the surface of the protrusion 133 facing away from the flange portion 132, so that the structure after the connecting portion 116 and the electrode terminal 13 are assembled occupies a smaller space.

[0182] Please refer to Figure 5 、 Figure 7 and Figure 8 According to some embodiments of the present application, there are multiple protrusions 133, and the multiple protrusions 133 are arranged at intervals around the central axis Q of the main body.

[0183] The plurality of protrusions 133 are spaced apart around the central axis Q of the main body 131 . For example, in the circumferential direction of the electrode terminal 13 , the angles between any two adjacent protrusions 133 are equal.

[0184] When there are multiple protrusions 133 , the first insulating member 16 is provided with multiple recesses 161 . The multiple recesses 161 are spaced apart around the central axis Q of the main body, and each recess 161 corresponds to one protrusion 133 .

[0185] In the above solution, there are multiple protrusions 133 to facilitate assembly with other components at multiple positions in the circumferential direction of the electrode terminal 13 , thereby improving the assembly stability of the electrode terminal 13 and the first wall 113 .

[0186] Please refer to Figure 7 According to some embodiments of the present application, a second reinforcement portion 135 is provided at the connection between the main body portion 131 and the flange portion 132 .

[0187] The second reinforcement portion 135 is provided at the connection between the main body portion 131 and the flange portion 132 . The second reinforcement portion 135 connects the main body portion 131 and the flange portion 132 to improve the overall strength of the structure formed by the main body portion 131 and the flange portion 132 .

[0188] In some embodiments, the second reinforcement portion 135 is connected to the first reinforcement portion 134 .

[0189] In the above solution, the provision of the second reinforcing portion 135 can disperse the stress on the electrode terminal 13 , reduce the risk of bending of the flange portion 132 , and reduce the risk of cracking at the connection between the main body portion 131 and the flange portion 132 .

[0190] Please refer to Figure 5 According to some embodiments of the present application, the wall portion 115 is provided with a groove 118, the electrode lead-out hole 114 passes through the bottom wall of the groove 118, and a portion of the connecting portion 116 is provided in the groove 118, so as to reduce the space occupied by the structure after the connecting portion 116 and the electrode terminal 13 are assembled in the thickness direction of the wall portion.

[0191] In some embodiments, a surface of the second section 1162 of the connecting portion 116 facing away from the interior of the battery cell 10 may be flush with a surface of the wall portion 115 facing away from the interior of the battery cell 10 .

[0192] According to some embodiments of the present application, an embodiment of the present application further provides a battery device 100 , which includes a battery cell 10 provided according to any of the above embodiments.

[0193] According to some embodiments of the present application, an electrical device is further provided, which includes a battery cell 10 or a battery device 100 provided according to any of the above embodiments, and the battery cell 10 or the battery device 100 is used to provide electrical energy.

[0194] The power-consuming device may be any of the aforementioned devices or systems that use the battery cell 10 or the battery device 100 as a power source.

[0195] According to some embodiments of this application, please refer to Figures 3 to 10The embodiment of the present application provides a battery cell 10 , which includes a housing 11 , an electrode terminal 13 , a first insulating member 16 , an electrode assembly 12 , a sealing member 15 and a transition member 14 .

[0196] The housing 11 includes a shell 111 and an end cap 112. The shell 111 has an opening, and the end cap 112 covers the opening. The end cap 112 is a first wall 113. The first wall 113 includes a wall portion 115 and a connecting portion 116. The wall portion 115 is a rectangular parallelepiped and defines an electrode lead-out hole 114. The connecting portion 116 is annular and surrounds the electrode lead-out hole 114. One end of the connecting portion 116 is connected to the wall portion 115.

[0197] The electrode assembly 12 is disposed in the housing 11 , and the electrode assembly 12 has a tab 121 .

[0198] The electrode terminal 13 includes a main body 131 and a flange 132. The main body 131 is electrically connected to external conductive components and internally to the tab 121 of the electrode assembly 12. The flange 132 protrudes from the periphery of the main body 131 and, together with the main body 131, covers the electrode lead-out hole 114. A portion of the main body 131 is disposed within the electrode lead-out hole 114, while the flange 132 is located outside the wall 115. Along the thickness of the wall 115, at least a portion of the flange 132 is disposed between the wall 115 and the connecting portion 116.

[0199] The seal 15 is annular and circumferentially disposed around the main body 131. Along the thickness of the wall 115, a portion of the seal 15 is located between the flange 132 and the wall 115. A portion of the seal 15 is located within the electrode lead-out hole 114 and between the main body 131 and the wall of the electrode lead-out hole 114. The seal 15 is an insulating structure that provides a sealed fit between the electrode terminal 13 and the first wall 113 while also providing insulation between the electrode terminal 13 and the first wall 113.

[0200] The adapter 14 is connected to the electrode terminal 13 and the tab 121 to facilitate electrical connection between the electrode terminal 13 and the tab 121. For example, the adapter 14 is welded to the main body of the electrode terminal 13, and the tab 121 is welded to the adapter 14.

[0201] Electrode terminal 13 also includes a protrusion 133, which is provided on the circumference of main body 131. Protrusion 133 is located outside wall 115 and extends inward from the outside of wall 115. Protrusion 133 connects to flange 132. A first reinforcement 134 is provided at the junction of protrusion 133 and flange 132, while a second reinforcement 135 is provided at the junction of main body 131 and flange 132. On the same projection plane perpendicular to the thickness direction of wall 115, the orthographic projection of first reinforcement 134 at least partially overlaps with the orthographic projection of seal 15.

[0202] The first insulating member 16 is annular. At least a portion of the first insulating member 16 is disposed between the electrode terminal 13 and the first wall 113. The first insulating member 16 surrounds the electrode terminal 13 and serves to separate the electrode terminal 13 from the first wall 113. The first insulating member 16 includes a recessed portion 161 corresponding to the protrusion 133. There are a plurality of protrusions 133 and a plurality of recessed portions 161. The plurality of protrusions 133 are spaced apart around the central axis Q of the main body. Each protrusion 133 corresponds to a recessed portion 161. At least a portion of the protrusion 133 is disposed within the recessed portion 161. The protrusions 133 cooperate with the recessed portions 161 to restrict rotation of the electrode terminal 13 relative to the first wall 113.

[0203] According to the battery cell 10 of the embodiment of the present application, the first insulating member 16 is disposed between the electrode terminal 13 and the first wall 113, which can separate the electrode terminal 13 from the first wall 113 and reduce the risk of short circuit between the positive and negative electrodes; at least a portion of the protrusion 133 is disposed in the recessed portion 161, and the protrusion 133 cooperates with the recessed portion 161 to limit the rotation of the electrode terminal 13 relative to the first wall 113; the provision of the first reinforcing portion 134 can enhance the strength of the connection between the protrusion 133 and the flange portion 132, disperse the stress at the connection between the protrusion 133 and the flange portion 132, and reduce the contact between the protrusion 133 and the flange portion 132. 2, thereby reducing the risk of bending of the flange portion 132 and the risk of cracking at the connection between the protrusion 133 and the flange portion 132, thereby improving the reliability of the battery cell 10; the provision of the second reinforcing portion 135 can enhance the strength of the connection between the main body portion 131 and the flange portion 132, further reducing the risk of bending of the flange portion 132, thereby improving the reliability of the battery cell 10; a portion of the sealing member 15 is provided between the flange portion 132 and the wall portion 115 to form a sealed fit between the flange portion 132 and the wall portion 115, thereby reducing the risk of leakage of electrolyte from between the flange portion 132 and the wall portion 115.

[0204] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing comprising a first wall; an electrode terminal disposed on the first wall, the electrode terminal comprising a main body and a flange protruding from a peripheral side of the main body; The electrode terminal further includes a protruding portion, which protrudes from the peripheral side of the main body portion and is connected to the flange portion along the thickness direction of the first wall. A first reinforcement portion is provided at the connection between the protruding portion and the flange portion.

2. The battery cell according to claim 1, wherein: The battery cell further comprises: A sealing member is provided along a thickness direction of the first wall, wherein at least a portion of the sealing member is provided between the flange portion and the first wall.

3. The battery cell according to claim 2, characterized in that: On the same projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first reinforcement portion at least partially overlaps with the orthographic projection of the sealing member.

4. The battery cell according to claim 2, characterized in that The battery cell further comprises: The first insulating member is at least partially disposed between the electrode terminal and the first wall, and is at least partially disposed around the electrode terminal. The first insulating member includes a recessed portion corresponding to the protruding portion, and the recessed portion cooperates with the protruding portion.

5. The battery cell according to claim 4, characterized in that The first wall includes a wall portion and a connecting portion connected to each other, the connecting portion at least partially surrounding the electrode terminal, the connecting portion being used to fix the electrode terminal to the wall portion, and at least a portion of the first insulating member being disposed between the connecting portion and the electrode terminal; At least a portion of the flange portion is provided between the wall portion and the connecting portion along a thickness direction of the wall portion.

6. The battery cell according to claim 5, characterized in that The minimum distance between the first reinforcement portion and the connection portion is W, which satisfies 0.2 mm ≤ W ≤ 5 mm.

7. The battery cell according to claim 5, characterized in that On the same projection plane perpendicular to the thickness direction of the wall portion, an orthographic projection of the connecting portion and an orthographic projection of the sealing member at least partially overlap.

8. The battery cell according to claim 5, characterized in that The connecting portion includes a first section, the first section is located outside the wall portion, and along a thickness direction of the wall portion, the flange portion is located between the first section and the wall portion.

9. The battery cell according to claim 8, characterized in that On the same projection plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the first segment and the orthographic projection of the sealing member at least partially overlap.

10. The battery cell according to claim 8, characterized in that The first section has a first surface facing the flange portion and a second surface facing the main body portion, and the first surface and the second surface are connected by a first chamfered surface.

11. The battery cell according to claim 5, characterized in that The connecting portion and the wall portion are integrally formed.

12. The battery cell according to claim 5, characterized in that The connecting portion and the wall portion are welded to form a first weld mark, and the first weld mark is arranged around the electrode terminal.

13. The battery cell according to claim 5, characterized in that The connecting portion and the first insulating member are both disposed around the electrode terminal.

14. The battery cell according to claim 5, characterized in that The flange portion has a third surface facing away from the wall portion and a fourth surface facing away from the main body portion, and the third surface and the fourth surface are connected by a second chamfered surface.

15. The battery cell according to claim 1, characterized in that There are multiple protrusions, and the multiple protrusions are arranged at intervals around the central axis of the main body.

16. The battery cell according to claim 1, characterized in that A second reinforcement portion is provided at a connection between the main body portion and the flange portion.

17. A battery device, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 16.

18. An electrical device, characterized in that: The battery cell according to any one of claims 1 to 16 or the battery device according to claim 17 is used to provide electrical energy.

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