Battery cell, battery device, and electric device

Abstract

Embodiments of the present application provide a battery monomer, a battery device and a power consumption device. The battery monomer comprises a shell and an electrode terminal. The shell comprises a first wall; the electrode terminal is arranged on the first wall, and the electrode terminal comprises a main body part and a flange part protruding from the periphery of the main body part; wherein the electrode terminal further comprises a protruding part protruding from the periphery of the main body part, the protruding part is connected with the flange part along the thickness direction of the first wall, and a first reinforcing part is arranged at the connection position of the protruding part and the flange part. The technical scheme of the present application can improve the reliability of the battery monomer.

Description

Battery cell, battery device and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery device, in particular to a battery cell, a battery device and an electric device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the manufacturing process of the battery device, the reliability of the battery device is a problem that cannot be ignored. Therefore, how to improve the reliability of the battery device is a technical problem that needs to be solved in the battery technology.

[0004] SUMMARY

[0005] The present application provides a battery cell, a battery device and an electric device, which can improve the reliability of the battery cell.

[0006] The present application is realized by the following technical solutions:

[0007] In a first aspect, the present application provides a battery cell, which comprises a shell and an electrode terminal. The shell comprises a first wall; the electrode terminal is arranged on the first wall, and the electrode terminal comprises a main body portion and a flange portion protruding from the periphery of the main body portion; wherein the electrode terminal further comprises a protruding portion protruding from the periphery of the main body portion, the protruding portion is connected with the flange portion along the thickness direction of the first wall, and a first reinforcing portion is arranged at the connection between the protruding portion and the flange portion.

[0008] According to the battery cell of the present application, the protruding portion protrudes from the periphery of the main body portion, so as to facilitate the cooperation of the electrode terminal with other components; the first reinforcing portion is arranged at the connection between the protruding portion and the flange portion, which can improve the strength of the connection between the protruding portion and the flange portion, disperse the stress at the connection between the protruding portion and the flange portion when the electrode assembly is subjected to external force, reduce the stress concentration at the connection between the protruding portion and the flange portion, reduce the risk of bending of the flange portion and the risk of cracking at the connection between the protruding portion and the flange portion, and improve the reliability of the battery cell, thereby improving the reliability of the battery device.

[0009] According to some embodiments of the present application, the battery cell further comprises a sealing member, at least a portion of the sealing member is arranged between the flange portion and the first wall along the thickness direction of the first wall.

[0010] In the above scheme, the arrangement of the sealing member can improve the sealing effect between the flange portion and the first wall, and reduce the risk of the flow of substances (such as electrolyte) between the flange portion and the first wall.

[0011] According to some embodiments of the present application, the first reinforcing part and the sealing part at least partially overlap in the same projection plane perpendicular to the thickness direction of the first wall.

[0012] In the above scheme, the first reinforcing part and the sealing part at least partially overlap, the first reinforcing part can absorb the force of the sealing part on the electrode terminal, so as to disperse the stress at the connection between the protruding part and the flange part, reduce the risk of bending of the flange part, and reduce the risk of cracking at the connection between the protruding part and the flange part.

[0013] According to some embodiments of the present application, the battery cell further comprises a first insulating part, at least part of the first insulating part is arranged between the electrode terminal and the first wall, and the first insulating part at least partially surrounds the electrode terminal, the first insulating part comprises a recess part corresponding to the protruding part, and the recess part cooperates with the protruding part.

[0014] In the above scheme, the arrangement of the first insulating part can separate the electrode terminal and the first wall, and the cooperation of the recess part and the protruding part can limit the rotation of the electrode terminal relative to the first wall, facilitating the assembly of the electrode terminal and the first wall.

[0015] According to some embodiments of the present application, the first wall comprises a wall part and a connecting part connected to each other, the connecting part at least partially surrounds the electrode terminal and is used to fix the electrode terminal to the wall part, and at least part of the first insulating part is arranged between the connecting part and the electrode terminal; along the thickness direction of the wall part, at least part of the flange part is arranged between the wall part and the connecting part.

[0016] In the above scheme, the connecting part at least partially surrounds the electrode terminal and has a large cooperation area with the electrode terminal in the circumferential direction of the electrode terminal, so as to facilitate the fixation of the electrode terminal to the wall part; along the thickness direction of the wall part, at least part of the flange part is arranged between the wall part and the connecting part, and the wall part and the connecting part cooperatively clamp the flange part, having a good constraint effect on the flange part.

[0017] According to some embodiments of the present application, the minimum distance between the first reinforcing part and the connecting part is W, satisfying 0.2mm≤W≤5mm.

[0018] In the above scheme, the minimum distance between the first reinforcing part and the connecting part satisfies the above relationship, which meets the requirement of the first insulating part for insulating separation of the connecting part and the first reinforcing part, and the structure after assembly of the connecting part and the electrode terminal occupies a small assembly space.

[0019] According to some embodiments of the present application, the connecting part and the sealing part at least partially overlap in the same projection plane perpendicular to the thickness direction of the wall part.

[0020] In the above scheme, the connection portion is matched with the wall portion, can 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 protruding portion and the flange portion.

[0021] According to some embodiments of the present application, the connection portion comprises a first segment, the first segment is located outside the wall portion and between the wall portion and the flange portion in the thickness direction of the wall portion.

[0022] In the above scheme, the first segment is located outside the wall portion and between the wall portion and the flange portion, facilitating the assembly of the electrode terminal and the first wall.

[0023] According to some embodiments of the present application, the first segment 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 chamfer surface.

[0024] In the above scheme, the first segment 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 chamfer surface.

[0025] According to some embodiments of the present application, the first segment 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 chamfer surface.

[0026] In the above scheme, the first segment is located outside the wall portion and between the wall portion and the flange portion, facilitating the assembly of the electrode terminal and the first wall.

[0027] According to some embodiments of the present application, the connection portion and the wall portion are integrally formed.

[0028] In the above scheme, the connection portion and the wall portion are integrally formed, facilitating processing and manufacturing, and the connection stability of the connection portion and the wall portion is high.

[0029] According to some embodiments of the present application, the connection portion and the wall portion are welded to form a first welding mark, and the first welding mark is arranged around the electrode terminal.

[0030] In the above scheme, the connection portion and the wall portion are welded, improving the connection stability of the connection portion and the wall portion, and the first welding mark is arranged around the electrode terminal, improving the connection reliability of the connection portion and the wall portion.

[0031] According to some embodiments of the present application, the connection portion and the first insulation member are both arranged around the electrode terminal.

[0032] 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.

[0033] 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.

[0034] In the above scheme, in the case where the connecting portion is unchanged and the insulation requirement of the first insulating member is met, the size of the flange portion protruding from the main body portion can be increased, and the distance between the electrode terminal and the connecting portion can be shortened, so that the flow area of the electrode terminal can be increased, and the flow capacity of the electrode terminal can be improved. In the case where the size of the flange portion protruding from the main body portion is unchanged and the insulation requirement of the first insulating member is met, the distance between the connecting portion and the electrode terminal can be shortened, so that the space occupation of the structure after assembly of the connecting portion and the electrode terminal can be reduced.

[0035] According to some embodiments of the present application, the number of the protruding portions is multiple, and the multiple protruding portions are arranged at intervals around the central axis of the main body portion.

[0036] In the above scheme, the number of the protruding portions is multiple, so as to facilitate assembly of the electrode terminal with other components at multiple positions in the circumferential direction of the electrode terminal, and improve the assembly stability of the electrode terminal and the first wall.

[0037] According to some embodiments of the present application, a second reinforcing portion is arranged at the connection between the main body portion and the flange portion.

[0038] In the above scheme, the arrangement of the second reinforcing portion can disperse the stress received by the electrode terminal, and reduce the risk of bending of the flange portion and the risk of cracking at the connection between the main body portion and the flange portion.

[0039] In a second aspect, the embodiments of the present application further provide a battery device, which comprises the battery cell according to any of the above embodiments.

[0040] In a third aspect, the embodiments of the present application further provide a power consumption device, which comprises the battery cell or the battery device according to any of the above embodiments, and the battery cell or the battery device is used to provide electric energy.

[0041] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as a limitation to the scope. For those of ordinary skill in the art, other related drawings can also be obtained from these drawings without any creative effort.

[0043] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0044] FIG. 2 is a structural exploded schematic diagram of a battery device according to some embodiments of the present application;

[0045] FIG. 3 is a structural exploded schematic diagram of a battery cell according to some embodiments of the present application;

[0046] FIG. 4 is a sectional view of a partial structure of a battery cell according to some embodiments of the present application;

[0047] FIG. 5 is an enlarged view of a portion of FIG. 4;

[0048] FIG. 6 is an enlarged view of a portion of FIG. 5;

[0049] FIG. 7 is a structural schematic diagram of an electrode terminal according to some embodiments of the present application;

[0050] FIG. 8 is a structural schematic diagram of a first insulating member according to some embodiments of the present application;

[0051] FIG. 9 is a sectional view of a partial structure of a battery cell according to other embodiments of the present application;

[0052] FIG. 10 is a sectional view of a partial structure of a battery cell according to still other embodiments of the present application.

[0053] In the drawings, the drawings are not drawn according to the actual scale.

[0054] Legend: 100 - battery device; 10 - battery cell; 11 - outer case; 111 - case body; 112 - end cap; 113 - first wall; 114 - electrode lead-out hole; 115 - wall portion; 116 - connecting portion; 1161 - first section; 1161a - first surface; 1161b - second surface; 1162 - second section; 1163 - third section; 1164 - first chamfered surface; 117 - first weld; 118 - groove; 12 - electrode assembly; 121 - tab; 13 - electrode terminal; 131 - main body portion; 131a - first end surface; 131b - second end surface; 132 - flange portion; 1321 - third surface; 1322 - fourth surface; 1323 - second chamfered surface; 133 - protrusion; 134 - first reinforcing portion; 135 - second reinforcing portion; 14 - adapter; 15 - sealing member; 16 - first insulating member; 161 - recessed portion; 20 - box body; 21 - first sub-box body; 22 - second sub-box body; 200 - controller; 300 - motor; 1000 - vehicle; Q - central axis of main body portion; Z - thickness direction of first wall. DETAILED DESCRIPTION

[0055] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of the present application.

[0056] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the use of the terms "including," "comprising," or "having" and variations thereof in the specification herein is meant to encompass the inclusion of one or more integers, features, elements, components, or steps without limitation; the use of the terms "first," "second," or "third" and variations thereof in the specification herein is meant to denote different features, elements, components, or steps, and does not imply a particular order or sequence.

[0057] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase that the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of other embodiments. It is explicitly contemplated that embodiments described herein can be combined with each other.

[0058] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0059] The term "and / or" in this application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0060] "Multiple" appearing in this application refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0061] The battery device mentioned in the embodiments of the application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel, or mixed connection through a busbar component.

[0062] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0063] In some embodiments, the battery device can be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0064] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0065] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0066] As an example, the box body can include a first sub-box body and a second sub-box body. The first sub-box body and the second sub-box body are buckled to form a closed space inside the box body to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first sub-box body can be a top cover or a bottom plate.

[0067] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0068] As an example, the box can be part of a chassis structure of a vehicle. For example, the top cover of the box can be at least part of a floor of the vehicle, or the frame of the box can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0069] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0070] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0071] The battery cell can be, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0072] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive electrode and the negative electrode from short-circuiting, and at the same time allow the active ions to pass through.

[0073] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0074] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction thereof, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0075] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. with silver plating treatment on the surface can be used. The composite current collector can include a high 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 high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0076] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used.

[0077] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0078] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, aluminum with a silver plating surface treatment, stainless steel with a silver plating surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, and the like with carbon, nickel, or titanium can be employed.

[0079] In some embodiments, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two surfaces of the negative electrode current collector.

[0080] As an example, the negative electrode active material can employ a negative electrode active material for a battery known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, lithium titanate, and the like. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative electrode active material can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0081] In some embodiments, the separator is a separator film. The present application does not particularly limit the type of the separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0082] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate member located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0083] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0084] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound to form the wound structure.

[0085] In some embodiments, the electrode assembly is a stacked structure.

[0086] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (e.g., polypropylene), a composite metal shell (e.g., a copper-aluminum composite shell), an aluminum-plastic film, or the like.

[0087] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a sealed space for containing the electrode assembly and the electrolyte and the like. The shell can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0088] 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 through an adapter. The electrode terminal can be provided on the end cap or on the shell.

[0089] In some embodiments, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cell.

[0090] 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, the housing can protect the electrode assembly and prevent electrolyte leakage and the like. When the housing is a non-sealed structure, the housing can protect the electrode assembly, and a sealing bag can be further included between the housing and the electrode assembly, the sealing bag is used to encapsulate the electrode assembly and the electrolyte and the like. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film.

[0091] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes, the prismatic battery cell includes a square battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, and the like.

[0092] The development of battery technology needs to consider various design factors, such as performance parameters such as energy density, discharge capacity, charge-discharge rate, and the like, in addition to the reliability of the battery device.

[0093] In some embodiments, the battery includes a shell and an electrode terminal, the electrode terminal is arranged on the shell, for example, the electrode terminal is arranged on an end cover of the shell. The electrode terminal includes a main body part and a flange part protruding from the periphery of the main body part, the main body part is externally connected to the busbar and internally connected to the tab, and the flange part is used to assemble with the shell (such as the end cover). In order to facilitate the assembly of the electrode terminal and other components (such as the insulating part), for example, the anti-rotation assembly of the electrode terminal and the insulating part, the electrode terminal further includes a protruding part protruding from the periphery of the main body part. When the electrode terminal is subjected to external force (such as the pulling force of the busbar, the force of the sealing part, etc.), stress concentration is prone to occur at the connection between the protruding part and the flange part, which causes the flange part to bend, and in severe cases, the connection between the protruding part and the flange part cracks, resulting in low reliability of the battery monomer.

[0094] In view of this, in order to solve the problem of low reliability of the battery monomer caused by stress concentration at the connection between the protruding part and the flange part, which causes the flange part to bend and the connection between the protruding part and the flange part to crack, the embodiments of the present application provide a battery monomer, which includes a shell and an electrode terminal, the shell includes a first wall; the electrode terminal is arranged on the first wall, and the electrode terminal includes a main body part and a flange part protruding from the periphery of the main body part; wherein the electrode terminal further includes a protruding part protruding from the periphery of the main body part, the protruding part is connected to the flange part along the thickness direction of the first wall, and a first reinforcing part is arranged at the connection between the protruding part and the flange part. The first reinforcing part enhances the strength of the connection between the protruding part and the flange part, so that the battery monomer has high reliability, thereby improving the reliability of the battery device.

[0095] In such a battery monomer, the protruding part protrudes from the periphery of the main body part to facilitate the assembly of the electrode terminal and other components; the first reinforcing part is arranged at the connection between the protruding part and the flange part, which can improve the strength of the connection between the protruding part and the flange part, and the connection between the protruding part and the flange part has high anti-deformation ability. When the electrode assembly is subjected to external force, the stress at the connection between the protruding part and the flange part can be dispersed, the stress concentration at the connection between the protruding part and the flange part can be reduced, the risk of bending of the flange part and the risk of cracking of the connection between the protruding part and the flange part can be reduced, and the reliability of the battery monomer can be improved, thereby improving the reliability of the battery device.

[0096] The battery monomer and the battery device disclosed in the embodiments of the present application can be used in, but not limited to, an electric device such as a vehicle, a ship or an aircraft. The power supply system of the electric device can be composed of the battery monomer and the battery device disclosed in the present application.

[0097] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery monomers and battery devices, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft including airplanes, rockets, space shuttles and spacecraft, etc.

[0098] The following embodiments are described for the convenience of illustration, taking a vehicle as an example of an electric device of an embodiment of the present application.

[0099] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000, for example, for the working power demand of the circuit system of the vehicle 1000, for example, for the working power demand of the vehicle 1000 during starting, navigation and running.

[0100] The vehicle 1000 can also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation and running.

[0101] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0102] Please refer to FIG. 2, which is a structural exploded schematic diagram of a battery device provided by some embodiments of the present application. The battery device 100 includes a battery monomer 10 and a box 20, and the battery monomer 10 is contained in the box 20. Among them, the box 20 is used to provide a containing space for the battery monomer 10, and the box 20 can adopt various structures. In some embodiments, the box 20 can include a first sub-box 21 and a second sub-box 22, the first sub-box 21 and the second sub-box 22 are mutually covered, and the first sub-box 21 and the second sub-box 22 jointly define a containing space for containing the battery monomer 10. The second sub-box 22 can be a hollow structure with one end open, and the first sub-box 21 can be a plate-shaped structure, which is covered on the open side of the second sub-box 22 to jointly define the containing space with the second sub-box 22; the first sub-box 21 and the second sub-box 22 can also be hollow structures with one side open, and the open side of the first sub-box 21 is covered on the open side of the second sub-box 22.

[0103] In the battery device 100, the battery cell 10 can be multiple, and the multiple battery cells 10 can be connected in series or in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 10 are connected in both series and parallel. The multiple battery cells 10 can be directly connected in series or in parallel or in a mixed manner, and then the multiple battery cells 10 are accommodated in the case 20. Of course, the battery device 100 can also be that the multiple battery cells 10 are connected in series or in parallel or in a mixed manner to form a battery module, and then the multiple battery modules are connected in series or in parallel or in a mixed manner to form a whole and are accommodated in the case 20. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 10.

[0104] Please refer to FIG. 3, which is a structural exploded view of a battery cell provided by some embodiments of the present application. As shown in FIG. 3, the battery cell 10 includes a housing 11, an electrode assembly 12, an electrode terminal 13 and other functional components. The housing 11 includes a shell 111 and an end cover 112, the shell 111 has an opening, and the end cover 112 closes the opening to isolate the internal environment of the battery cell 10 from the external environment.

[0105] The shell 111 is a component for cooperating with the end cover 112 to form the internal environment of the battery cell 10, and the formed internal environment can be used to accommodate the electrode assembly 12, the electrolyte and other components. The shell 111 and the end cover 112 can be independent components. The shell 111 can be of various shapes and sizes. Specifically, the shape of the shell 111 can be determined according to the specific shape and size of the electrode assembly 12. The material of the shell 111 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0106] The end cover 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 cover 112 can be adapted to the shape of the shell 111 to fit the shell 111. Optionally, the end cover 112 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 112 is less likely to deform when subjected to extrusion collision, allowing the battery cell 10 to have higher structural strength and reliability. The end cover 112 can be provided with functional components such as electrode terminals 13, pressure relief mechanisms, etc. The electrode terminals 13 can be used to electrically connect with the electrode assembly 12 for outputting or inputting the electrical energy of the battery cell 10. The material of the end cover 112 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the present application does not make special limitations thereon. In some embodiments, an insulating structure can also be provided on the inner side of the end cover 112, which can be used to isolate the electrical connection components in the shell 111 from the end cover 112 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0107] The electrode assembly 12 is a component in which electrochemical reactions occur in the battery cell 10. One or more electrode assemblies 12 can be contained in the shell 111. The electrode assembly 12 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and generally has a separator film between the positive electrode sheet and the negative electrode sheet, which is used to separate the positive electrode sheet and the negative electrode sheet to avoid internal short circuit of the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion with active material constituting the main body of the electrode assembly 12, and a portion without active material constituting the tab of the positive electrode sheet and the negative electrode sheet, respectively. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at two ends of the main body, respectively.

[0108] Please refer to FIG. 3, and further refer to FIG. 4 to FIG. 7, FIG. 4 is a cross-sectional view of a partial structure of a battery cell provided by some embodiments of the present application, FIG. 5 is a partial enlarged view of A in FIG. 4, FIG. 6 is a partial enlarged view of B in FIG. 5, and FIG. 7 is a structural schematic view of an electrode terminal provided by some embodiments of the present application. 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 periphery of the main body 131. The electrode terminal 13 further includes a protruding portion 133 protruding from the periphery of the main body 131, and the protruding portion 133 is connected with the flange portion 132 along the thickness direction Z of the first wall. The connection between the protruding portion 133 and the flange portion 132 is provided with a first reinforcing portion 134.

[0109] The first wall 113 can be a wall of the shell 111 or an end cover 112, and the first wall 113 can be located at different positions of the shell 111 according to different design requirements.

[0110] Optionally, the first wall 113 is the end cover 112, which facilitates assembly of the electrode terminal 13 and the first wall 113.

[0111] In some embodiments, the battery cell 10 further includes an electrode assembly 12 disposed in the shell 111. The electrode assembly 12 can have a jelly-roll structure or a stacked structure.

[0112] In some embodiments, the battery cell 10 can be a square battery cell 10, for example, the electrode assembly 12 can have a flat shape, and the thickness direction of the electrode assembly 12 can be perpendicular to the thickness direction Z of the first wall.

[0113] The electrode terminal 13 is used to output or input the electric energy of the battery cell 10, wherein the protruding portion 133 is electrically connected to an external conductive member (such as a busbar) on the outside and is electrically connected to the tab 121 of the electrode assembly 12 on the inside.

[0114] The flange portion 132 protrudes from the surface of the peripheral side 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 an end surface of the main body portion 131 away from the inside of the battery cell 10, the second end surface 131b is an end surface of the main body portion 131 facing the inside of the battery cell 10, and 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.

[0115] In some embodiments, the first wall 113 can be provided with an electrode lead-out hole 114, the electrode lead-out hole 114 can penetrate the first wall 113 along the thickness direction Z of the first wall, the main body portion 131 and the flange portion 132 cooperate to cover the electrode lead-out hole 114, and the main body portion 131 is electrically connected to the tab 121 through the electrode lead-out hole 114. For example, a part of the main body portion 131 can extend into the electrode lead-out hole 114 to be directly connected to the tab 121 or connected through the adapter 14; or a part of the adapter 14 extends into the electrode lead-out hole 114 and is electrically connected to the main body portion 131, so that the electrode terminal 13 is electrically connected to the tab 121 through the adapter 14.

[0116] The protruding portion 133 can be a limiting structure arranged on the circumferential side of the main body portion 131, so as to facilitate assembly with other components. For example, the protruding portion 133 can cooperate with an insulating member to limit rotation of the electrode terminal 13 relative to the first wall 113 about the central axis Q of the main body portion.

[0117] The protruding portion 133 can be connected to the flange portion 132 in the thickness direction Z of the first wall. In other words, the protruding portion 133 extends toward the flange portion 132 in the thickness direction Z of the first wall and is connected to the flange portion 132. It can also be understood that the protruding portion 133 extends from the flange portion 132 in the thickness direction Z of the first wall, so that the structure formed by the protruding portion 133 and the flange portion 132 has higher overall strength.

[0118] In some embodiments, the main body portion 131, the flange portion 132, the protruding portion 133, and the first reinforcing portion 134 are integrally formed, so that the electrode terminal 13 has higher overall strength and is convenient for processing and manufacturing.

[0119] The first reinforcing portion 134 is arranged at the connection between the protruding portion 133 and the flange portion 132, and the first reinforcing portion 134 connects the protruding portion 133 and the flange portion 132, further improving the overall strength of the structure formed by the protruding portion 133 and the flange portion 132, i.e., strengthening the strength of the connection between the protruding portion 133 and the flange portion 132.

[0120] According to the battery monomer 10 of the embodiments of the present application, the protruding portion 133 protrudes from the circumferential side of the main body portion 131 to facilitate assembly of the electrode terminal 13 with other components; the first reinforcing portion 134 is arranged at the connection between the protruding portion 133 and the flange portion 132, which can improve the strength of the connection between the protruding portion 133 and the flange portion 132, disperse stress at the connection between the protruding portion 133 and the flange portion 132 when the electrode assembly 12 is subjected to external force, reduce stress concentration at the connection between the protruding portion 133 and the flange portion 132, reduce the risk of bending of the flange portion 132 and the risk of cracking at the connection between the protruding portion 133 and the flange portion 132, and improve the reliability of the battery monomer 10.

[0121] According to some embodiments of the present application, the orthogonal projection of the protruding portion 133 falls within the orthogonal projection of the flange portion 132 when viewed in the thickness direction Z of the first wall.

[0122] For example, the size between the surface of the protruding portion 133 away from the main body portion 131 and the central axis Q of the main body portion is smaller than the size between the outer circumferential surface of the flange portion 132 and the central axis Q of the main body portion.

[0123] In the above scheme, the protruding portion 133 occupies less space in a plane perpendicular to the central axis Q of the main body portion, so that the protruding portion 133 occupies less space after assembly with other components.

[0124] Please refer to FIG. 6 and FIG. 7, according to some embodiments of the present application, the battery cell 10 further comprises a seal 15, at least a part of the seal 15 is arranged between the flange portion 132 and the first wall 113 along the thickness direction Z of the first wall.

[0125] In some embodiments, a part of the seal 15 is arranged between the flange portion 132 and the first wall 113 along the thickness direction Z of the first wall, or the whole of the seal 15 is arranged between the flange portion 132 and the first wall 113.

[0126] In the embodiments in which the first wall 113 is provided with the electrode lead-out hole 114, the seal 15 is arranged around the electrode lead-out hole 114, and the flange portion 132 is sealed with the first wall 113 by the seal 15 to achieve the sealing of the electrode lead-out hole 114.

[0127] In the above scheme, the arrangement of the seal 15 can improve the sealing effect between the flange portion 132 and the first wall 113, and reduce the risk of the flow of substances (such as electrolyte) between the flange portion 132 and the first wall 113, for example, reduce the risk of leakage of electrolyte flowing out of the electrode lead-out hole 114 between the flange portion 132 and the first wall 113.

[0128] Please refer to FIG. 5 and FIG. 6, according to some embodiments of the present application, the first reinforcing portion 134 and the seal 15 at least partially overlap in the same projection plane perpendicular to the thickness direction Z of the first wall.

[0129] The first reinforcing portion 134 and the seal 15 can partially overlap or fully overlap in the projection along the thickness direction Z of the first wall.

[0130] After the assembly of the battery cell 10, the seal 15 is compressed and deformed to form a sealing surface between the flange portion 132 and the first wall 113, and the seal 15 exerts a counterforce on the flange portion 132, that is, the connecting portion of the protruding portion 133 and the flange portion 132 is subjected to the force from the seal 15. The arrangement of the first reinforcing portion 134 can enhance the overall strength of the connecting portion of the protruding portion 133 and the flange portion 132, and further enhance the ability of the connecting portion of the protruding portion 133 and the flange portion 132 to resist the force of the seal 15.

[0131] In the above scheme, the first reinforcing portion 134 and the seal 15 at least partially overlap, and the first reinforcing portion 134 can absorb the force of the seal 15 on the electrode terminal 13 to disperse the stress at the connecting portion of the protruding portion 133 and the flange portion 132, and reduce the risk of bending of the flange portion 132 and the risk of cracking at the connecting portion of the protruding portion 133 and the flange portion 132.

[0132] Please refer to FIG. 5 and FIG. 6, and further refer to FIG. 8, which is a structural schematic diagram of the first insulating member according to some embodiments of the present application. According to some embodiments of the present application, the battery cell 10 further comprises a first insulating member 16, at least part of the first insulating member 16 is arranged between the electrode terminal 13 and the first wall 113, and the first insulating member 16 is arranged at least partially around the electrode terminal 13, the first insulating member 16 comprises a recessed portion 161 corresponding to the protruding portion 133, and the recessed portion 161 cooperates with the protruding portion 133.

[0133] The first insulating member 16 is a component for insulating and separating the electrode terminal 13 and the first wall 113, and the material of the first insulating member 16 can be plastic or rubber.

[0134] The first insulating member 16 is arranged at least partially between the electrode terminal 13 and the first wall 113, and the first insulating member 16 is arranged at least partially around the electrode terminal 13, so as to separate the electrode terminal 13 and the first wall 113. For example, part of the first insulating member 16 is arranged between the electrode terminal 13 and the first wall 113, and the first insulating member 16 is arranged around the central axis Q of the main body portion by one turn or part of a turn; for another example, the entire first insulating member 16 is arranged between the electrode terminal 13 and the first wall 113, and the first insulating member 16 is arranged around the central axis Q of the main body portion by one turn or part of a turn.

[0135] The recessed portion 161 can be a groove formed on the surface of the first insulating member 16 facing the main body portion 131, and the profile of the recessed portion 161 matches the profile of the protruding portion 133, so that at least part of the protruding portion 133 can be embedded in the recessed portion 161.

[0136] When the first insulating member 16 and the electrode terminal 13 are assembled, part of the protruding portion 133 can be embedded in the recessed portion 161, or the entire protruding portion 133 can be embedded in the recessed portion 161.

[0137] In the above scheme, the arrangement of the first insulating member 16 can separate the electrode terminal 13 and the first wall 113, and the cooperation of the recessed portion 161 and the protruding portion 133 can limit the rotation of the electrode terminal 13 relative to the first wall 113, so as to facilitate the assembly of the electrode terminal 13 and the first wall 113.

[0138] In some embodiments, the first insulating member 16 can be heat-welded with the electrode terminal 13, so as to improve the connection stability of the first insulating member 16 and the electrode terminal 13.

[0139] Please refer to FIG. 5 and FIG. 6, according to some embodiments of the present application, the first wall 113 comprises a wall portion 115 and a connecting portion 116 connected to each other, the connecting portion 116 is arranged at least partially around the electrode terminal 13, the connecting portion 116 is used to fix the electrode terminal 13 to the wall portion 115, at least part of the first insulating member 16 is arranged between the connecting portion 116 and the electrode terminal 13; at least part of the flange portion 132 is arranged between the wall portion 115 and the connecting portion 116 along the thickness direction of the wall portion 115.

[0140] The wall portion 115 and the connecting portion 116 are two parts constituting the first wall 113, the wall portion 115 can be the base body 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 fixedly welded to the wall portion 115.

[0141] The connecting portion 116 can be annular and arranged around the circumference of the electrode terminal 13, or the connecting portion 116 can have an arc surface arranged around the circumference of the electrode terminal 13, so that the connecting portion 116 can have a larger contact area with the electrode terminal 13 in the circumferential direction of the electrode terminal 13. The circumferential direction of the electrode terminal 13 can be the direction around the central axis of the electrode terminal 13, and the central axis Q of the main body portion is the central axis of the electrode terminal 13.

[0142] The thickness direction of the wall portion 115 is parallel to the thickness direction Z of the first wall.

[0143] At least part of the flange portion 132 is arranged between the wall portion 115 and the connecting portion 116 along the thickness direction of the wall portion 115, and the connecting portion 116 can clamp the flange portion 132 in cooperation with the wall portion 115, so as to fix the flange portion 132 to the wall portion 115.

[0144] In the above scheme, the connecting portion 116 is arranged at least partially around the electrode terminal 13, and has a larger contact area with the electrode terminal 13 in the circumferential direction of the electrode terminal 13, so as to fix the electrode terminal 13 to the wall portion 115; at least part of the flange portion 132 is arranged between the wall portion 115 and the connecting portion 116 along the thickness direction of the wall portion 115, and the wall portion 115 and the connecting portion 116 clamp the flange portion 132, so as to have a better constraint effect on the flange portion 132.

[0145] Please refer to FIG. 5 and FIG. 6, according to some embodiments of the present application, the minimum distance between the first reinforcing portion 134 and the connecting portion 116 is W, which satisfies 0.2mm≤W≤5mm.

[0146] The minimum distance between the first reinforcing portion 134 and the connecting portion 116 refers to the minimum value of the distance between the first reinforcing portion 134 and the connecting portion 116 in any direction. For example, when the first reinforcing portion 134 is a chamfered structure, the first reinforcing portion 134 has an outer circumferential surface facing away from the main body portion 131, and in a cross section parallel to the central axis Q of the main body portion and passing through the central axis Q of the main body portion, the minimum distance between the outer circumferential surface and the connecting portion 116 in a direction perpendicular to the outer circumferential surface can be the minimum distance between the first reinforcing portion 134 and the connecting portion 116.

[0147] For example, the minimum distance W between the first reinforcing portion 134 and the connecting portion 116 can be any one value or a range between any two values selected from 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.6 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.6 mm, 4.8 mm, 5 mm.

[0148] In some embodiments, the space between the first reinforcing portion 134 and the connecting portion 116 can be filled with the first insulating member 16 to separate the first reinforcing portion 134 and the connecting portion 116.

[0149] In the above scheme, when W≥0.2 mm, the first insulating member 16 has a certain thickness to meet the requirement of insulating separation of the connecting portion 116 and the first reinforcing portion 134 by the first insulating member 16; and when W≤5 mm, the structure after assembly of the connecting portion 116 and the electrode terminal 13 occupies a smaller assembly space. Therefore, the minimum distance between the first reinforcing portion 134 and the connecting portion 116 meets the above relationship, and under the condition of meeting the requirement of insulating separation of the connecting portion 116 and the first reinforcing portion 134 by the first insulating member 16, the structure after assembly of the connecting portion 116 and the electrode terminal 13 occupies a smaller assembly space.

[0150] Please refer to FIG. 6, according to some embodiments of the present application, the orthographic projection of the connecting portion 116 and the orthographic projection of the sealing member 15 at least partially overlap on the same projection plane perpendicular to the thickness direction of the wall portion 115.

[0151] When viewed along 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 partially overlap, or the orthographic projection of the connecting portion 116 and the orthographic projection of the sealing member 15 completely overlap, so that the connecting portion 116 and the wall portion 115 cooperatively clamp the flange portion 132 and the sealing member 15, so as to absorb the force of the sealing member 15 acting on the flange portion 132 through the connecting portion 116 and the wall portion 115.

[0152] In the above scheme, the connection portion 116 is provided with a first section 1161 located on the outer side of the wall portion 115, and the flange portion 132 is located between the first section 1161 and the wall portion 115, so as to facilitate the assembly of the electrode terminal 13 and the first wall 113.

[0153] In some embodiments, the flange portion 132 can be located on the inner side of the wall portion 115.

[0154] Optionally, the flange portion 132 is located on the outer side of the wall portion 115, so as to facilitate the assembly of the electrode terminal 13 and the first wall 113.

[0155] Referring to FIG. 6, according to some embodiments of the present application, the connection portion 116 includes a first section 1161 located on the outer side of the wall portion 115, and the flange portion 132 is located between the first section 1161 and the wall portion 115.

[0156] The flange portion 132 is located on the outer side of the wall portion 115, and the first section 1161 is located on the outer side of the wall portion 115, so as to facilitate the assembly of the electrode terminal 13 and the first wall 113.

[0157] The first section 1161 is a portion of the connection portion 116 facing away from the wall portion 115, and the first section 1161 can be parallel to the wall portion 115, or the extension plane of the first section 1161 intersects the wall portion 115.

[0158] In some embodiments, the connection portion 116 further includes a second section 1162 connected to the wall portion 115 and a third section 1163 connecting the first section 1161 and the second section 1162, so that the connection portion 116 forms a step on the outer side of the wall portion 115, and the connection portion 116 and the wall portion 115 enclose a space for accommodating the flange portion 132, so that a portion of the flange portion 132 can be located in the space.

[0159] In the above scheme, the first section 1161 is located on the outer side of the wall portion 115, and the flange portion 132 is located between the first section 1161 and the wall portion 115, so as to facilitate the assembly of the electrode terminal 13 and the first wall 113.

[0160] Referring to FIG. 6, according to some embodiments of the present application, the first section 1161 and the sealing member 15 at least partially overlap in the same projection plane perpendicular to the thickness direction of the wall portion 115.

[0161] The first section 1161 is partially overlapped with the sealing member 15 in the thickness direction of the wall portion 115.

[0162] In some embodiments, the first section 1161 has a thickness smaller than that of the other sections of the connecting portion 116, so as to occupy a smaller assembly space in the thickness direction of the wall portion 115 after the connecting portion 116 is assembled with the electrode terminal 13.

[0163] In the above scheme, the first section 1161 is partially overlapped with the sealing member 15 in the thickness direction of the wall portion 115, and the first section 1161 has a better constraint effect on the flange portion 132, so as to absorb the force of the sealing member 15 acting on the electrode terminal 13 in the thickness direction of the wall portion 115.

[0164] Please refer to FIG. 9, which is a sectional view of a partial structure of a battery cell according to some embodiments of the present application. According to some embodiments of the present application, the first section 1161 has a first surface 1161a facing the flange portion 132 and a second surface 1161b facing the main body portion 131, and the first surface 1161a and the second surface 1161b are connected by a first chamfered surface 1164.

[0165] 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 circularly arc transitioned.

[0166] In the above scheme, the protruding portion 133 protrudes outward from the main body portion 131, the first section 1161 is closer to the protruding portion 133 than the other sections of the connecting portion 116, and the connection between the first surface 1161a and the second surface 1161b is the area of the connecting portion 116 closest to the protruding portion 133. The first chamfered surface 1164 is provided, on the one hand, to reduce the distance between the first section 1161 and the first reinforcing portion 134 while meeting the insulation effect of the first insulating member 16, and on the other hand, to reduce the space occupation of the structure after the connecting portion 116 is assembled with the electrode terminal 13 while the assembly structure of the connecting portion 116 and the electrode terminal 13 remains unchanged. In this way, 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, thereby improving the insulation effect of the first insulating member 16 on the connecting portion 116 and the electrode terminal 13.

[0167] According to some embodiments of the present application, the connecting portion 116 is integrally formed with the wall portion 115.

[0168] The connecting portion 116 and the wall portion 115 can be structures made by an integral molding process, such as casting, stamping, or milling, etc.

[0169] In the above scheme, the connecting portion 116 and the wall portion 115 are integrally molded, facilitating processing and manufacturing, the connecting stability of the connecting portion 116 and the wall portion 115 is higher, and the assembly stability of the connecting portion 116 and the electrode terminal 13 can be improved.

[0170] Please refer to FIGS. 5 and 6, according to some embodiments of the present application, the connecting portion 116 and the wall portion 115 are welded to form a first welding mark 117, and the first welding mark 117 is arranged around the electrode terminal 13.

[0171] In some embodiments, the first welding mark 117 can be referred to as a welding seam formed after the connecting portion 116 and the wall portion 115 are welded. The connecting portion 116 and the wall portion 115 are connected by welding, so that the connecting portion 116 and the wall portion 115 are firmly connected, for example, the connecting portion 116 and the wall portion 115 can be connected by laser welding.

[0172] When the connecting portion 116 and the wall portion 115 are assembled, a circle of welding can be performed around the circumference of the electrode terminal 13, so that the first welding mark 117 is arranged around the electrode terminal 13.

[0173] In the above scheme, the connecting portion 116 and the wall portion 115 are welded, improving the connecting stability of the connecting portion 116 and the wall portion 115, and the first welding mark 117 is arranged around the electrode terminal 13, improving the connecting reliability of the connecting portion 116 and the wall portion 115.

[0174] Please refer to FIGS. 5 and 8, according to some embodiments of the present application, the connecting portion 116 and the first insulating member 16 are both arranged around the electrode terminal 13.

[0175] The connecting portion 116 can have a ring structure around the central axis of the electrode terminal 13, and the connecting portion 116 has a through hole, and a part of the electrode terminal 13 is arranged in the through hole.

[0176] The first insulating member 16 can have a ring structure around 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, so as to separate the connecting portion 116 and the electrode terminal 13.

[0177] In the above scheme, the connecting portion 116 is arranged around the electrode terminal 13, which can constrain the electrode terminal 13 at any position on the circumference of the electrode terminal 13; the first insulating member 16 is arranged around the electrode terminal 13, which can separate the electrode terminal 13 and the connecting portion 116 at any position on the circumference of the electrode terminal 13, improving the insulation effect.

[0178] Please refer to FIG. 10, which is a sectional view of a partial structure 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, and the third surface 1321 and the fourth surface 1322 are connected by a second chamfer surface 1323.

[0179] In some embodiments, the first reinforcing portion 134 is arranged on the same projection plane as the flange portion 132.

[0180] The third surface 1321 is a surface of the flange portion 132 that is away from the wall portion 115 in the thickness direction of the wall portion 115. The fourth surface 1322 is a surface of the flange portion 132 that is away from the central axis Q (see FIG. 5) of the main body portion.

[0181] The second chamfer 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 circularly arc transitioned.

[0182] In the above scheme, when the connecting portion 116 remains unchanged and meets the insulation requirements of the first insulating member 16, the size of the flange portion 132 protruding from the main body portion 131 can be increased, the distance between the electrode terminal 13 and the connecting portion 116 can be shortened, the overcurrent area of the electrode terminal 13 can be increased, and the overcurrent capacity of the electrode terminal 13 can be improved. When the size of the flange portion 132 protruding from the main body portion 131 remains unchanged and meets the insulation requirements of the first insulating member 16, the distance between the connecting portion 116 and the electrode terminal 13 can be shortened, and the space occupied by the structure after the connecting portion 116 and the electrode terminal 13 are assembled can be reduced.

[0183] According to some embodiments of the present application, the flange portion 132 and the connecting portion 116 are both located on the outer side of the wall portion 115. When the insulation requirements of the first insulating member 16 are met, the surface of the connecting portion 116 facing away from the wall portion 115 can not exceed the surface of the protruding portion 133 facing away from the flange portion 132 in the direction of the inner side of the wall portion 115 to the outer side, so that the structure after the connecting portion 116 and the electrode terminal 13 are assembled occupies a smaller space.

[0184] Please refer to FIG. 5, FIG. 7 and FIG. 8. According to some embodiments of the present application, the number of protruding portions 133 is multiple, and the multiple protruding portions 133 are arranged at intervals around the central axis Q of the main body portion.

[0185] The plurality of protrusions 133 are arranged at intervals around the central axis Q of the body portion 131 on the periphery of the electrode terminal 13, for example, the angle between any two adjacent protrusions 133 is equal.

[0186] When the number of protrusions 133 is multiple, the first insulating member 16 is provided with a plurality of recesses 161 arranged at intervals around the central axis Q of the body portion, each recess 161 corresponding to one protrusion 133.

[0187] In the above scheme, the number of protrusions 133 is multiple, so as to be assembled with other components at multiple positions on the periphery of the electrode terminal 13, and improve the assembly stability of the electrode terminal 13 and the first wall 113.

[0188] Please refer to FIG. 7, according to some embodiments of the present application, the connection between the body portion 131 and the flange portion 132 is provided with a second reinforcing portion 135.

[0189] The second reinforcing portion 135 is arranged at the connection between the body portion 131 and the flange portion 132, and the second reinforcing portion 135 connects the body portion 131 and the flange portion 132, and improves the overall strength of the structure formed by the body portion 131 and the flange portion 132.

[0190] In some embodiments, the second reinforcing portion 135 is connected with the first reinforcing portion 134.

[0191] In the above scheme, the arrangement of the second reinforcing portion 135 can disperse the stress received by the electrode terminal 13, and reduce the risk of bending of the flange portion 132 and the risk of cracking at the connection between the body portion 131 and the flange portion 132.

[0192] Please refer to FIG. 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 penetrates the groove bottom wall of the groove 118, and a part of the connecting portion 116 is arranged in the groove 118, so as to reduce the space occupation of the structure after the assembly of the connecting portion 116 and the electrode terminal 13 in the thickness direction of the wall portion.

[0193] In some embodiments, the surface of the second section 1162 of the connecting portion 116 facing away from the inside of the battery monomer 10 can be flush with the surface of the wall portion 115 facing away from the inside of the battery monomer 10.

[0194] According to some embodiments of the present application, the embodiments of the present application also provide a battery device 100, which comprises the battery monomer 10 provided according to any of the above embodiments.

[0195] According to some embodiments of the present application, the present application further provides a power consuming device comprising the battery cell 10 or the battery device 100 according to any of the above embodiments, the battery cell 10 or the battery device 100 being configured to provide electric energy.

[0196] The power consuming device can be a device or a system using the battery cell 10 or the battery device 100 as a power source.

[0197] According to some embodiments of the present application, referring to FIGS. 3-10, the present application provides a battery cell 10 comprising a housing 11, an electrode terminal 13, a first insulation member 16, an electrode assembly 12, a sealing member 15, and a switching member 14.

[0198] The housing 11 comprises a shell 111 and an end cover 112, the shell 111 having an opening, and the end cover 112 covering the opening and being a first wall 113. The first wall 113 comprises a wall portion 115 and a connecting portion 116, the wall portion 115 being a cuboid and having an electrode lead-out hole 114, and the connecting portion 116 being annular and arranged around the electrode lead-out hole 114, and one end of the connecting portion 116 being connected to the wall portion 115.

[0199] The electrode assembly 12 is arranged in the housing 11, and the electrode assembly 12 has a tab 121.

[0200] The electrode terminal 13 comprises a main body portion 131 and a flange portion 132, the main body portion 131 being electrically connected to an external conductive member externally and being electrically connected to the tab 121 of the electrode assembly 12 internally, and the flange portion 132 being protruded on the circumferential side of the main body portion 131 and covering the electrode lead-out hole 114 together with the main body portion 131. A part of the main body portion 131 is arranged in the electrode lead-out hole 114, and the flange portion 132 is located outside the wall portion 115. At least a part of the flange portion 132 is arranged between the wall portion 115 and the connecting portion 116 along the thickness direction of the wall portion 115.

[0201] The sealing member 15 is annular and arranged around the circumference of the main body portion 131, and a part of the sealing member 15 is located between the flange portion 132 and the wall portion 115 along the thickness direction of the wall portion 115. A part of the sealing member 15 is located in the electrode lead-out hole 114 and between the main body portion 131 and the hole wall of the electrode lead-out hole 114. The sealing member 15 is an insulating structure, which realizes the sealing cooperation and the insulation isolation between the electrode terminal 13 and the first wall 113.

[0202] The switching member 14 is connected to the electrode terminal 13 and the tab 121, so as to realize the electrical connection between the electrode terminal 13 and the tab 121. For example, the switching member 14 is welded to the main body portion of the electrode terminal 13, and the tab 121 is welded to the switching member 14.

[0203] The electrode terminal 13 further comprises a protruding portion 133 protruding from a side of the main body portion 131, the protruding portion 133 being located outside the wall portion 115 and pointing from outside to inside of the wall portion 115, the protruding portion 133 being connected with the flange portion 132. A first reinforcing portion 134 is arranged at the connection between the protruding portion 133 and the flange portion 132, and a second reinforcing portion 135 is arranged at the connection between the main body portion 131 and the flange portion 132. The orthogonal projection of the first reinforcing portion 134 at least partially overlaps the orthogonal projection of the sealing member 15 on the same projection plane perpendicular to the thickness direction of the wall portion 115.

[0204] The first insulating member 16 is annular, at least a portion of the first insulating member 16 is arranged between the electrode terminal 13 and the first wall 113, and the first insulating member 16 is arranged around the electrode terminal 13, the first insulating member 16 is used to separate the electrode terminal 13 and the first wall 113. The first insulating member 16 comprises a plurality of recessed portions 161 corresponding to the protruding portions 133, the plurality of protruding portions 133 are arranged at intervals around the central axis Q of the main body portion, each protruding portion 133 is arranged corresponding to one recessed portion 161, at least a portion of the protruding portion 133 is arranged in the recessed portion 161, and the protruding portion 133 cooperates with the recessed portion 161 to limit the rotation of the electrode terminal 13 relative to the first wall 113.

[0205] According to the battery cell 10 of the embodiments of the present application, the first insulating member 16 is arranged between the electrode terminal 13 and the first wall 113, which can separate the electrode terminal 13 and the first wall 113, and reduce the risk of positive and negative contact short circuit; at least a portion of the protruding portion 133 is arranged in the recessed portion 161, and the protruding portion 133 cooperates with the recessed portion 161 to limit the rotation of the electrode terminal 13 relative to the first wall 113; the first reinforcing portion 134 is arranged to enhance the strength of the connection between the protruding portion 133 and the flange portion 132, disperse the stress at the connection between the protruding portion 133 and the flange portion 132, reduce the stress concentration at the connection between the protruding portion 133 and the flange portion 132, reduce the risk of bending of the flange portion 132 and the risk of cracking at the connection between the protruding portion 133 and the flange portion 132, and improve the reliability of the battery cell 10; the second reinforcing portion 135 is arranged to enhance the strength of the connection between the main body portion 131 and the flange portion 132, further reduce the risk of bending of the flange portion 132, and facilitate to improve the reliability of the battery cell 10; a portion of the sealing member 15 is arranged between the flange portion 132 and the wall portion 115 to form a sealing cooperation between the flange portion 132 and the wall portion 115, and reduce the risk of leakage of electrolyte from between the flange portion 132 and the wall portion 115.

[0206] Although the present application has been described with reference to preferred embodiments, various modifications can be made to the application without departing from the scope of the application. In particular, the technical features mentioned in the various embodiments can be combined in any way, provided that there is no structural conflict. The present 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 by, The battery monomer comprises: a housing comprising a first wall; an electrode terminal disposed on the first wall, the electrode terminal comprising a main body portion and a flange portion protruding from a peripheral side of the main body portion; wherein the electrode terminal further comprises a protruding portion protruding from a peripheral side of the main body portion along a thickness direction of the first wall, the protruding portion being connected with the flange portion, and a first reinforcing portion being disposed at a connection between the protruding portion and the flange portion.

2. The battery cell of claim 1, wherein, The battery monomer further comprises: a seal, at least a portion of the seal being disposed between the flange portion and the first wall along the thickness direction of the first wall.

3. The battery cell of claim 2, wherein, A normal projection of the first reinforcing portion and a normal projection of the seal at least partially overlap on a same projection plane perpendicular to the thickness direction of the first wall.

4. The battery cell according to claim 2 or 3, characterized in that, The battery monomer further comprises: a first insulating member, at least a portion of the first insulating member being disposed between the electrode terminal and the first wall, and the first insulating member at least partially surrounding the electrode terminal, the first insulating member comprising a recess portion corresponding to the protruding portion, the recess portion being matched with the protruding portion.

5. The battery cell of claim 4, wherein, The first wall comprises a wall portion and a connecting portion connected with each other, the connecting portion at least partially surrounding the electrode terminal, the connecting portion being used for fixing 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 disposed between the wall portion and the connecting portion along a thickness direction of the wall portion.

6. The battery cell of claim 5, wherein, A minimum distance between the first reinforcing portion and the connecting portion is W, and 0.2mm≤W≤5mm is satisfied.

7. The battery cell according to claim 5 or 6, characterized in that A normal projection of the connecting portion and a normal projection of the seal at least partially overlap on a same projection plane perpendicular to the thickness direction of the wall portion.

8. The battery cell of any one of claims 5-7, wherein, The connecting portion comprises a first segment, the first segment being located outside the wall portion, and the flange portion being located between the first segment and the wall portion along the thickness direction of the wall portion.

9. The battery cell of claim 8, wherein, A normal projection of the first segment and a normal projection of the seal at least partially overlap on a same projection plane perpendicular to the thickness direction of the wall portion.

10. The battery cell according to claim 8 or 9, characterized in that The first segment 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 chamfer surface.

11. The battery cell of any one of claims 5-10, wherein, The connecting portion is integrally formed with the wall portion.

12. The battery cell of any one of claims 5-10, wherein, The connecting portion and the wall portion are welded to form a first welding mark, and the first welding mark surrounds the electrode terminal.

13. The battery cell of any one of claims 5-12, wherein, The connecting portion and the first insulating member both surround the electrode terminal.

14. The battery cell of any one of claims 5-13, wherein, 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 chamfer surface.

15. The battery cell of any one of claims 1-14, wherein, The number of the protruding portions is plural, and the plural protruding portions are spaced apart around a central axis of the main body portion.

16. The battery cell of any one of claims 1-15, wherein, A second reinforcing portion is disposed at a connection between the main body portion and the flange portion.

17. A battery device characterized by comprising: The battery device comprises the battery monomer as claimed in any one of claims 1-16.

18. An electrical device, comprising: The battery monomer or the battery device as claimed in any one of claims 1-16 or 17 is used for providing electric energy.

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