Battery cell, battery and electrical apparatus

Abstract

A battery cell, a battery and an electrical apparatus, relating to the technical field of batteries. The battery cell comprises a first housing wall, terminals and first insulating parts. The terminals are arranged on the first housing wall in a penetrating mode and each terminal comprises a first fixing part and a second fixing part which are arranged on the two sides of the first housing wall. Each first fixing part comprises a first surface away from the first housing wall. A first insulating part is arranged on the side of the first housing wall facing each first fixing part, and comprises a first part located between each first fixing part and the first housing wall and a second part located in the peripheral area of each first fixing part. Each second part comprises a clearance surface arranged around each first fixing part. Each clearance surface is arranged closer to the first housing wall than to each first surface.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202420166067.1 and application date 2024-01-23, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] In recent years, new energy vehicles have experienced rapid development. In the electric vehicle sector, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. Power batteries consist of several battery cells, but the reliability of these cells needs to be improved.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can improve the reliability of the battery cell.

[0007] In the first aspect, an embodiment of the present application provides a battery cell, comprising: a shell, a pole and a first insulating member, the shell comprising a first shell wall, the pole comprising a penetration portion penetrating the first shell wall, and a first fixing portion and a second fixing portion connected to the penetration portion and respectively arranged on both sides of the first shell wall in the wall thickness direction, the first fixing portion comprising a first surface facing away from the first shell wall, the first insulating member being arranged on a side of the first shell wall facing the first fixing portion, and comprising a first portion located between the first fixing portion and the first shell wall, and a second portion located in the peripheral area of ​​the first fixing portion; wherein the second portion comprises an air avoidance surface arranged around the first fixing portion, and the air avoidance surface is arranged closer to the first shell wall relative to the first surface.

[0008] In the above technical solution, the surface of the first insulating member surrounding the first fixing portion, away from the first housing wall, is designed as a clearance surface. This creates a first clearance space on the side of the clearance surface away from the first housing wall. This space allows the rivet pin to completely cover the first fixing portion while preventing it from protruding beyond the first fixing portion. This mitigates the risk of the rivet pin causing cracking or imprinting on the first insulating member, protecting the first insulating member and improving the reliability of the insulation seal between the housing and the terminal, thereby enhancing the reliability of the battery cell. Furthermore, because the rivet pin can completely cover the first fixing portion, this mitigates the risk of imprinting or failing to meet flatness standards due to the rivet pin's inability to fully press the first fixing portion.

[0009] In some embodiments, the second portion includes a protruding portion protruding relative to the air-avoiding surface toward a direction away from the first shell wall, and the air-avoiding surface is disposed between the protruding portion and the first fixing portion.

[0010] In the above technical solution, by providing a clearance surface on the side of the protruding portion close to the first fixing portion, the first clearance space formed at the clearance surface can be used to separate the first fixing portion and the protruding portion, thereby improving the problem of the protruding portion being squeezed by the riveting pin while meeting the protruding requirements of the protruding portion.

[0011] In some embodiments, the battery cell includes an active material coating portion located on the inner side of a first shell wall, a first insulating member is disposed on the inner side of the first shell wall, the protrusion includes a first protrusion, the first protrusion includes a second surface disposed away from the first shell wall, and the second surface is further away from the first shell wall relative to the first surface so as to abut against the active material coating portion.

[0012] In the above technical solution, the first insulating member can improve the installation stability of the active material coating part in the shell by setting the first protrusion to abut the active material coating part, and reduce the risk of short circuit between the active material coating part and the pole, thereby improving the reliability of the battery cell.

[0013] In some embodiments, there are multiple first protrusions that are spaced apart.

[0014] In the above technical solution, the first insulating part can achieve abutment against the active material coating part from multiple positions by setting multiple first protrusions to abut the active material coating part, further improving the installation stability of the active material coating part in the shell, further reducing the risk of short circuit between the active material coating part and the pole, and improving the reliability of the battery cell.

[0015] In some embodiments, a pressure relief structure is provided on the first shell wall, and the protrusion includes a second protrusion, and the second protrusion is located at a position corresponding to the pressure relief structure to form a concave cavity open toward the pressure relief structure.

[0016] In the above technical solution, the first insulating member defines a concave cavity by setting a second convex portion, so that there can be a certain space between the first insulating member and the pressure relief structure, improving the close contact of the first insulating member with the pressure relief structure, thereby improving the reliability of the pressure relief structure in opening the valve to relieve pressure and improving the working reliability of the battery cell.

[0017] In some embodiments, the second protrusion includes a third surface disposed away from the first shell wall, and the third surface is disposed farther away from the first shell wall than the first surface or is flush with the first surface.

[0018] In the above technical solution, by setting the side surface of the second protrusion away from the first shell wall to be farther away from the first shell wall relative to the first surface or to be flush with the first surface, the second protrusion can protrude a greater distance in the direction away from the first shell wall. In this way, a relatively deep cavity can be formed while ensuring that the wall thickness at the second protrusion is not too thin, so as to better balance the structural reliability of the first insulating component and the reliability of the pressure relief structure in opening the valve and relieving pressure.

[0019] In some embodiments, the clearance surface ensures that the spacing distance between the first fixing portion and the protruding portion is greater than or equal to 1 mm.

[0020] In the above technical solution, by providing an air-avoiding surface, the spacing distance between the first fixing portion and the protruding portion is greater than or equal to 1 mm, thereby reserving a larger space so that the coverage range of the riveting ejector can be more substantially larger than the range of the first fixing portion. This satisfies the requirements of the tooling positioning tolerance, and the requirement that the riveting ejector completely covers the first fixing portion is met, while the spacing distance between the first fixing portion and the protruding portion is sufficient to avoid air, thereby improving the squeezing of the protruding portion by the riveting ejector during riveting, thereby improving problems such as cracking or stamping of the first insulating member.

[0021] In some embodiments, a height difference between the air-avoiding surface and the first surface is greater than or equal to 0.5 mm.

[0022] In the above technical solution, during the riveting process, the riveting pin needs to move a certain distance toward the air avoidance surface. By setting the height difference between the air avoidance surface and the first surface to be greater than or equal to 0.5 mm, there is sufficient height space to avoid the riveting pin, so as to meet the pole riveting requirements while achieving air avoidance of the riveting pin, thereby protecting the first insulating member.

[0023] In some embodiments, the height difference between the air-avoiding surface and the first surface is less than or equal to 1 mm.

[0024] In the above technical solution, by limiting the height difference between the air-avoidance surface and the first surface to 0.5mm-1mm, it is possible to meet the pole riveting requirements while more effectively improving the thin wall thickness of the first insulating part at the step surface, which is beneficial to improving the structural reliability of the first insulating part.

[0025] In some embodiments, the battery cell also includes a second insulating member and an insulating seal. The second insulating member is arranged on the side of the first shell wall facing the second fixed portion, and is at least partially clamped between the second fixed portion and the first shell wall; the insulating seal is arranged between the first shell wall and the pole, and is located on the side of the second insulating member close to the first fixed portion, and on the side of the first insulating member close to the penetrating portion. The insulating seal is an elastic member and is elastically compressed to seal between the first fixed portion and the first shell wall.

[0026] In the above technical solution, after the pole and the first shell wall are assembled in place, the insulating seal is squeezed by the first fixing portion and the first shell wall into a compressed state, so that the sealing portion can be tightly attached to the first fixing portion and the first shell wall under the action of its own elastic force, thereby achieving a seal between the shell and the pole, thereby achieving an insulating seal between the first shell wall and the pole.

[0027] In some embodiments, the first insulating member is located on the inner side of the first shell wall, and a first air avoidance space is formed on the side of the air avoidance surface away from the first shell wall. A first channel connected to the first air avoidance space is formed between the first insulating member and the first fixed part, and a second channel connected to the outside of the shell is formed between the second insulating member and the second fixed part or the first shell wall. The connection position between the second channel and the first channel is blocked by an insulating seal.

[0028] In the above technical solution, by providing the first channel and the second channel, it can be found whether the insulating seal in a relatively hidden position is missing, so that the pole and the first shell wall can be reliably sealed.

[0029] In some embodiments, the first insulating member has a first groove open toward the first fixing portion, the first groove defines at least a portion of the first channel, and the second insulating member has a second groove open toward the first shell wall, the second groove defines at least a portion of the second channel.

[0030] In the above technical solution, by machining the first groove on the first insulating member and machining the second groove on the second insulating member, the first channel and the second channel can be simply and conveniently constructed, thereby reducing the difficulty of machining and assembly and improving production efficiency.

[0031] In some embodiments, the depths of the first groove and the second groove are both in the range of 0.2 mm to 0.35 mm, and the widths of the first groove and the second groove are both in the range of 0.2 mm to 0.5 mm.

[0032] In the above technical solution, by defining the groove depth and groove width of the first groove and the second groove as above, both the processing requirements and the detection requirements can be met.

[0033] In some embodiments, a plurality of first channels and a plurality of second channels are arranged at intervals around the pole, and positions of the plurality of first channels correspond to positions of the plurality of second channels.

[0034] In the above technical solution, by providing a plurality of first channels and a plurality of second channels in one-to-one correspondence, the risk of a single channel being blocked by foreign matter and failing to perform normal detection can be reduced, so that the missing installation detection of the insulating seal can be carried out smoothly and reliably.

[0035] In some embodiments, first channels are respectively provided on two opposite sides of the pole, and the number of second channels is the same as that of the first channels and their positions correspond to each other.

[0036] In the above technical solution, it is conducive to achieving non-directional installation of the first insulating member and the second insulating member, and can realize fool-proof operation, thereby reducing assembly difficulty and improving assembly efficiency.

[0037] In some embodiments, the insulating seal includes a sealing portion arranged between the first fixed portion and the first shell wall, and an insulating portion arranged between the penetrating portion and the first shell wall. The sealing portion is arranged close to the penetrating portion relative to the first portion, and is elastically compressed to seal between the first fixed portion and the first shell wall. The end of the insulating portion away from the first fixed portion abuts against the second insulating member.

[0038] In the above technical solution, by providing the insulating seal structure as described above, the insulation between the first shell wall and the pole can be improved, thereby alleviating the short circuit problem.

[0039] In some embodiments, the first part includes a first section and a second section, the first section is clamped between the first fixed part and the first shell wall, the second section is connected to the side of the first section close to the penetrating part, and the second section is spaced apart from the first fixed part to form a second air avoidance space between the second section and the first fixed part, and the insulating seal partially extends into the second air avoidance space.

[0040] In the above technical solution, by providing the second air-avoiding space, the insulating seal can be fully compressed to reliably seal the gap between the first fixing portion and the first shell wall, thereby improving the sealing performance between the shell and the pole.

[0041] In some embodiments, a accommodating cavity is formed in the shell, and a accommodating groove is formed on the pole, which is open in a direction away from the accommodating cavity. The pole has a connecting hole, which passes through the groove wall on one side of the accommodating groove close to the accommodating cavity and connects the accommodating cavity and the accommodating groove.

[0042] In the above technical solution, when injecting electrolyte into the battery cell, the electrolyte can be injected into the receiving tank and then flow toward the receiving cavity through the connecting hole. The receiving tank can serve as a buffer for the electrolyte to improve the problem of electrolyte splashing and overflow. In addition, the side walls of the receiving tank can block electrolyte splashing to a certain extent, reducing external contamination caused by the electrolyte and facilitating rapid injection. Moreover, since there is no need to open a separate injection channel on the shell, there is no need for special processing of the shell, which helps to reduce the structural complexity and processing difficulty of the shell.

[0043] In some embodiments, the battery cell includes a cell assembly, which includes an active material coating portion received in a receiving cavity, and a conductive portion connected to the active material coating portion, wherein the conductive portion is passed through a connecting hole to be at least partially received in the receiving groove.

[0044] In the above technical solution, by accommodating at least part of the conductive part in the receiving groove, at least part of the conductive part occupies the space in the receiving groove, thereby reducing the space occupied by the conductive part in the receiving cavity, saving space in the receiving cavity to accommodate a larger volume of active material coating part, which is beneficial to improving the energy density of the battery cell, or when the energy density of the battery cell remains unchanged, it is beneficial to reduce the size of the battery cell.

[0045] In some embodiments, the battery cell includes a pole cover plate covering the receiving groove, a liquid injection hole communicating with the receiving groove is formed on the pole cover plate, and the battery cell further includes a sealing structure for sealing the liquid injection hole.

[0046] In the above technical solution, by processing the injection hole on the pole cover, the opening is relatively small and located outside, so that the injection inlet can be reliably sealed more easily through the sealing structure, thereby improving the working reliability of the battery cell and realizing flexible and diversified design of the sealing structure.

[0047] In some embodiments, a plurality of poles are provided on the first shell wall, and the second portion includes a clearance surface respectively provided around each first fixing portion.

[0048] In the above technical solution, the plurality of poles on the first shell wall are not likely to cause cracking or stamping problems of the first insulating member during riveting installation, thereby further improving the reliability of the first insulating member.

[0049] In some embodiments, the number of poles on the first housing wall is two and the poles have opposite polarities.

[0050] In the above technical solution, both the positive electrode column and the negative electrode column are mounted on the first shell wall, which is beneficial to improving the production efficiency of the battery cell.

[0051] In some embodiments, the shell includes a shell body and an end cover, the shell body defines a accommodating cavity open toward the end cover, the end cover seals the opening of the accommodating cavity, and the first shell wall is a wall portion of the shell body arranged opposite to the end cover.

[0052] In the above technical solution, by arranging the pole on the side of the shell body opposite to the end cover, the connection position between the shell body and the end cover can be far away from the pole.

[0053] In some embodiments, the first fixing portion is located on a side of the first shell wall facing the accommodating cavity, and the second fixing portion is fixed to the first shell wall by riveting.

[0054] In the above technical solution, riveting can be performed from the outside of the shell, which facilitates the riveting operation.

[0055] In a second aspect, an embodiment of the present application further provides a battery comprising a battery cell according to any of the above solutions.

[0056] In the above technical solution, since the reliability of the battery cell according to the embodiment of the present application is improved, it is beneficial to improve the performance of the battery.

[0057] In a third aspect, an embodiment of the present application further provides an electrical device comprising a battery according to any of the above solutions.

[0058] In the above technical solution, since the performance of the battery is improved, it is beneficial to improve the working power performance of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] 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.

[0060] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0061] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0062] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0063] FIG4 is an exploded view of the structure of the battery cell shown in FIG3 ;

[0064] FIG5 is a schematic orthographic projection diagram of a battery cell provided in some embodiments of the present application;

[0065] FIG6 is a cross-sectional view along line AA in FIG5;

[0066] FIG7 is a partial enlarged view of the circled portion B in FIG6 ;

[0067] FIG8 is a partial enlarged view of the circled portion C in FIG7 ;

[0068] FIG9 is a schematic diagram of pole riveting provided by some embodiments of the present application;

[0069] FIG10 is a cross-sectional view along line EE in FIG5 ;

[0070] FIG11 is a partial enlarged view of the circled portion D in FIG6 .

[0071] : Reference numerals: vehicle 1000; first direction X; second direction Y; third direction Z; battery 100; controller 200; motor 300; housing 101; first housing body 1011; second housing body 1012; battery cell 102; housing 1; housing body 1a; end cover 1b; accommodating chamber 10; first housing wall 11; mounting hole 12; central axis L; second housing wall 13; pole 2; penetration portion 21; first fixing portion 22; first surface 221; second fixing portion 23; accommodating groove 25; communicating hole 26; supporting portion 27; sealing insulating assembly 3; first air-avoiding space 30; first insulating member 31; first portion 311; first segment 3111; second segment 31 12; second portion 312; air-avoiding surface 3121; protrusion 3122; first protrusion 3123; second surface 31231; second protrusion 3124; cavity 31241; third surface 31242; first groove 315; second air-avoiding space 316; second insulating member 32; first portion 321; second groove 325; insulating seal 33; sealing portion 331; local portion 3311; insulating portion 332; first channel S1; second channel S2; battery cell assembly 4; active material coating portion 41; conductive portion 42; pole cover 5; liquid injection hole 51; sealing structure 6; first seal 61; second seal 62; pressure relief structure 7; riveted ejector pin 2000. DETAILED DESCRIPTION

[0072] 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 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.

[0073] 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 for the purpose of describing specific embodiments only 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0078] The term "plurality" used in this application refers to two or more (including two).

[0079] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0080] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery module generally includes multiple battery cells. A battery pack generally includes a casing for enclosing one or more battery cells or one or more battery modules. The casing can reduce the impact of liquids or other foreign matter on the charging or discharging of the battery cells.

[0081] A battery cell consists of a housing, a cell assembly, and an electrolyte. The housing holds the cell assembly and electrolyte. The cell assembly includes at least one electrode assembly, which consists of a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly can be a wound or stacked structure. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets.

[0082] A positive electrode sheet generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The uncoated positive current collector protrudes from the coated positive current collector, serving as the positive tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide.

[0083] A negative electrode sheet generally includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is directly or indirectly coated on the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon, silicon, or other materials.

[0084] To ensure that high currents can pass without melting, the positive electrode tabs are multiple and stacked together to form the positive electrode tab portion, and the negative electrode tabs are multiple and stacked together to form the negative electrode tab portion. The housing is provided with a pole post, and the positive electrode tab portion is electrically connected to the positive electrode post, and the negative electrode tab portion is electrically connected to the negative electrode post. For example, the tab portion can be connected to the pole post to form a direct electrical connection between the tab portion and the pole post. For another example, the battery cell assembly can include an adapter plate, the tab portion is connected to the adapter plate, and the adapter plate is connected to the pole post to form an indirect electrical connection between the tab portion and the pole post.

[0085] The material of the isolation film is not limited, and can be, for example, polypropylene or polyethylene.

[0086] In the related art, in order to achieve insulation sealing between the shell and the pole, the battery cell usually has an insulating sealing assembly between the pole and the shell. The pole usually includes a penetration portion that penetrates the shell, and an inner fixing portion and an outer fixing portion that are locked and limited on both sides of the shell. The insulating sealing assembly includes an inner insulating member located on the inner side of the shell and sandwiched between the inner fixing portion and the shell, and an outer insulating member located on the outer side of the shell and sandwiched between the outer fixing portion and the shell. To facilitate the installation of the pole, during assembly, the inner and outer insulating members can be installed in place first, and then the pole can be penetrated into the shell. A riveting pin is used to support the inner fixing portion from the inside of the shell, and then a riveting device is used to rivet the pole from the outside of the shell to form an outer fixing portion that is locked and limited on the outside of the shell.

[0087] However, affected by factors such as assembly tolerance and processing tolerance, it is difficult for the rivet pin to cover the inner fixing part exactly. If the coverage area of ​​the rivet pin is smaller than the area of ​​the inner fixing part, the rivet pin cannot completely press the inner fixing part, which will cause the inner fixing part to be uneven, resulting in unqualified flatness of the pole. If the coverage area of ​​the rivet pin is equal to or slightly larger than the area of ​​the inner fixing part, although the rivet pin can completely press the inner fixing part, due to assembly tolerance, the rivet pin may also press the inner insulating part around the inner fixing part (that is, the part of the inner insulating part located around the inner fixing part). In this way, during the riveting process, the rivet pin may cause the inner insulating part to crack or form imprints, affecting the reliability of the insulation seal between the shell and the pole, resulting in a decrease in the reliability of the battery cell.

[0088] To this end, an embodiment of the present application proposes a battery cell that achieves air avoidance by designing an air avoidance surface around the portion of the terminal that needs to cooperate with the insulating part on the side of the riveted ejector pin. This allows the riveted ejector pin to completely cover the non-riveted surface of the terminal. This allows the riveted ejector pin to be used to avoid the riveted ejector pin, thereby alleviating the risk of the riveted ejector pin causing cracking or imprinting on the insulating part on that side, thereby protecting the insulating part on that side, thereby improving the reliability of the insulation seal between the housing and the terminal, and thus improving the reliability of the battery cell. Furthermore, because the riveted ejector pin can completely cover the non-riveted surface of the terminal, this can alleviate the problem of imprinting on the non-riveted surface of the terminal and causing unqualified flatness due to the riveted ejector pin's inability to press the entire non-riveted surface of the terminal.

[0089] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0090] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0091] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The 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 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0092] In some embodiments of the present application, the battery 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.

[0093] Please refer to Figure 2, which is an exploded view of the structure of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 101 and a plurality of battery cells 102, and the battery cells 102 are accommodated in the box body 101. The box body 101 is used to provide an assembly space for the battery cells 102, and the box body 101 can adopt a variety of structures. In some embodiments, the box body 101 may include a first box body 1011 and a second box body 1012, and the first box body 1011 and the second box body 1012 cover each other, and the first box body 1011 and the second box body 1012 jointly define an assembly space for accommodating the battery cells 102. The second box body 1012 can be a hollow structure with one end open, and the first box body 1011 can be a plate-like structure. The first box body 1011 covers the open side of the second box body 1012, so that the first box body 1011 and the second box body 1012 jointly define an assembly space. The first box body 1011 and the second box body 1012 can also be hollow structures with one side open, and the open side of the first box body 1011 covers the open side of the second box body 1012. Of course, the box body 101 formed by the first box body 1011 and the second box body 1012 can be of various shapes, such as a cylinder, a cuboid, etc.

[0094] In the battery 100, multiple battery cells 102 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to multiple battery cells 102 being connected both in series and in parallel. Multiple battery cells 102 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 102 is housed within the housing 101. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 102 in series, in parallel, or in a hybrid configuration to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 101. The battery 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 102.

[0095] Each battery cell 102 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 102 can be cylindrical, flat, or rectangular. For example, FIG3 is a schematic diagram of the structure of a battery cell provided in some embodiments of the present application. Referring to the embodiment shown in FIG3 , the length direction of the battery cell 102 is a first direction X, the width direction of the battery cell 102 is a second direction Y, and the height direction of the battery cell 102 is a third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0096] FIG4 is an exploded view of the structure of the battery cell 102 shown in FIG3 , FIG5 is an orthographic schematic diagram of the battery cell 102 provided in some embodiments of the present application, FIG6 is a cross-sectional view along line AA in FIG5 , and FIG7 is a partial enlarged view of the circled portion B in FIG6 . In some embodiments of the present application, in conjunction with FIG3 , FIG4 and FIG7 , the battery cell 102 includes: a shell 1 and a pole 2, the pole 2 is provided in the shell 1, and a receiving cavity 10 is formed inside the shell 1. Exemplarily, the battery cell 102 includes a cell assembly 4, the cell assembly 4 may include an active material coating portion 41 and a conductive portion 42 connected to the active material coating portion 41, the active material coating portion 41 is received in the receiving cavity 10, and the conductive portion 42 is welded to the pole 2 so that the conductive portion 42 is electrically connected between the active material coating portion 41 and the pole 2. It is understandable that the active material coating portion 41 may include a current collector coated with an active material layer, and the conductive portion 42 may include only the pole ear portion, or may include the pole ear portion and a transition piece electrically connected to the pole ear portion, etc., which is not limited here.

[0097] FIG8 is a partial enlarged view of the circled portion C in FIG7 . In conjunction with FIG4 and FIG8 , the housing 1 includes a first housing wall 11 having a mounting hole 12, and the pole 2 is passed through the mounting hole 12 to be mounted on the first housing wall 11. The pole 2 includes a penetration portion 21, which is passed through the mounting hole 12, i.e., at least a portion of the penetration portion 21 is located within the mounting hole 12, and the projection direction is the axial direction of the mounting hole 12 (i.e., the extension direction of the central axis L of the mounting hole 12 shown in FIG7 ), and the projection plane is the plane perpendicular to the axial direction of the mounting hole 12. The projection of the penetration portion 21 on the projection plane falls within the projection range of the mounting hole 12 on the projection plane, thereby enabling the penetration portion 21 to be passed through the mounting hole 12.

[0098] Please refer to Figures 7 and 8 again. The pole 2 also includes a first fixing portion 22 and a second fixing portion 23 connected to the penetration portion 21 and respectively arranged on both sides of the first shell wall 11 in the wall thickness direction. For example, the two side surfaces of the first shell wall 11 in the wall thickness direction are respectively an outer surface and an inner surface. The inner surface is the side surface of the first shell wall 11 facing the accommodating cavity 10, and the outer surface is the side surface of the first shell wall 11 away from the accommodating cavity 10. The side of the outer surface away from the accommodating cavity 10 is the outer side of the outer surface, and the side of the inner surface facing the accommodating cavity 10 is the inner side of the inner surface. The first fixing portion 22 is connected to the penetration portion 21 and extends relative to the penetration portion 21 in a direction away from the central axis L of the mounting hole 12. The second fixing portion 23 is connected to the penetration portion 21 and extends relative to the penetration portion 21 in a direction away from the central axis L of the mounting hole 12. The first fixing portion 22 extends to the inner side of the inner surface of the first shell wall 11, and the second fixing portion 23 extends to the outer side of the outer surface of the first shell wall 11, or the first fixing portion 22 extends to the outer side of the outer surface of the first shell wall 11, and the second fixing portion 23 extends to the inner side of the inner surface of the first shell wall 11.

[0099] In the present application, the pole 2 is provided with a first fixing portion 22 and a second fixing portion 23 to achieve fixed position between the pole 2 and the first housing wall 11 in the inward and outward directions. Specifically, the first fixing portion 22 and the second fixing portion 23 are respectively abutted and fixed with the first housing wall 11. The abutment does not require direct contact and can be indirect contact, as long as it has a stop and limit function. Therefore, at least a portion of the first fixing portion 22 is directly opposite the first housing wall 11 to prevent the pole 2 from moving relative to the first housing wall 11 toward the second fixing portion 23. At least a portion of the second fixing portion 23 is directly opposite the first housing wall 11 to prevent the pole 2 from moving relative to the first housing wall 11 toward the first fixing portion 22. It can be understood that, with the axial direction of the mounting hole 12 as the projection direction and the plane perpendicular to the axial direction of the mounting hole 12 as the projection plane, the projection of the first fixing portion 22 on the projection plane and the projection of the first shell wall 11 on the projection plane have an intersection area, and the part of the first fixing portion 22 corresponding to the intersection area is opposite to the first shell wall 11, and the projection of the second fixing portion 23 on the projection plane and the projection of the first shell wall 11 on the projection plane have an intersection area, and the part of the second fixing portion 23 corresponding to the intersection area is opposite to the first shell wall 11.

[0100] Exemplarily, the second fixing portion 23 abuts the first housing wall 11 by riveting. Exemplarily, the shape of the first fixing portion 22 remains consistent before and after the pole 2 is assembled with the first housing wall 11, but the shape of the second fixing portion 23 changes before and after the pole 2 is assembled with the first housing wall 11. After the pole 2 is assembled to the mounting hole 12 through the penetration portion 21, the first fixing portion 22 abuts the first housing wall 11. The second fixing portion 23 is produced using a flanging riveting process to achieve abutment between the second fixing portion 23 and the first housing wall 11. This facilitates assembly of the pole 2 and the first housing wall 11, and ensures reliable abutment.

[0101] Referring again to Figures 4, 7, and 8, the battery cell 102 further includes a sealing insulating assembly 3, which is insulated and fitted between the terminal post 2 and the first housing wall 11. That is, at least a portion of the sealing insulating assembly 3 is sandwiched between the first housing wall 11 and the terminal post 2, so that the terminal post 2 and the first housing wall 11 are indirectly fitted together via the sealing insulating assembly 3, thereby achieving insulation and sealing between the first housing wall 11 and the terminal post 2. The sealing insulating assembly 3 includes a first insulating member 31 and a second insulating member 32. The first insulating member 31 is disposed on a side of the first housing wall 11 facing the first fixing portion 22, with at least a portion of the first insulating member 31 disposed between the first fixing portion 22 and the first housing wall 11 to provide insulation between the first fixing portion 22 and the first housing wall 11. The second insulating member 32 is disposed on a side of the first housing wall 11 facing the second fixing portion 23, with at least a portion of the second insulating member 32 disposed between the second fixing portion 23 and the first housing wall 11 to provide insulation between the second fixing portion 23 and the first housing wall 11.

[0102] Referring again to Figures 7 and 8 , in the embodiment of the present application, the first fixing portion 22 includes a first surface 221 facing away from the first housing wall 11, and the first insulating member 31 includes a first portion 311 located between the first fixing portion 22 and the first housing wall 11, and a second portion 312 located in the outer peripheral region of the first fixing portion 22. The second portion 312 includes a clearance surface 3121 disposed around the first fixing portion 22, with the clearance surface 3121 being located closer to the first housing wall 11 than the first surface 221. That is, the side of the second portion 312 surrounding the first fixing portion 22, which is located away from the first housing wall 11, is the clearance surface 3121. The clearance surface 3121 is recessed relative to the first surface 221 toward the first housing wall 11, such that the side of the clearance surface 3121 away from the first housing wall 11 forms a first clearance space 30.

[0103] For example, referring to the orientation shown in Figures 7 and 8, the first fixing portion 22 is located below the first shell wall 11, the second fixing portion 23 is located above the first shell wall 11, the lower surface of the first fixing portion 22 is the first surface 221, the first insulating member 31 is located below the first shell wall 11, and the first part 311 of the first insulating member 31 is located above the first fixing portion 22, so as to be located between the first fixing portion 22 and the first shell wall 11, the second part 312 of the first insulating member 31 is located in the outer peripheral area of ​​the first fixing portion 22, and the lower surface of the second part 312 surrounding the first fixing portion 22 is the air avoidance surface 3121, and the air avoidance surface 3121 is higher than the lower surface of the first fixing portion 22 to meet the requirement that the air avoidance surface 3121 is set close to the first shell wall 11 relative to the first surface 221, so that a first air avoidance space 30 can be formed below the air avoidance surface 3121.

[0104] For example, referring to Figures 7-9 , when the pole 2 is mounted to the first housing wall 11 by riveting, a riveting pin 2000 can be used to push up against the first fixing portion 22 from the bottom of the first housing wall 11, and then the second fixing portion 23 can be riveted from the top of the first housing wall 11 so that the second fixing portion 23 abuts against the second insulating member 32. The coverage area of ​​the riveting pin 2000 can be larger than that of the first fixing portion 22 to ensure that the riveting pin 2000 completely covers the first fixing portion 22, thereby ensuring uniform force across the first fixing portion 22 and improving unevenness of the first fixing portion 22 after riveting due to uneven force. Moreover, since the coverage area of ​​the riveting pin 2000 is larger than that of the first fixing portion 22, the portion of the riveting pin 2000 that extends beyond the first fixing portion 22 can correspond to the air avoidance surface 3121 surrounding the first fixing portion 22. In this way, when the riveting pin 2000 moves upward during the riveting process, the portion of the riveting pin 2000 that extends beyond the first fixing portion 22 can enter the first air avoidance space 30 without squeezing the first insulating member 31, thereby improving the problem of cracking or imprinting of the first insulating member 31, thereby protecting the first insulating member 31.

[0105] In short, according to the battery cell 102 of the embodiment of the present application, the surface of the first insulating member 31 surrounding the first fixing portion 22, which is away from the first housing wall 11, is designed as a clearance surface 3121. This creates a first clearance space 30 on the side of the clearance surface 3121 away from the first housing wall 11. This allows the rivet pin 2000 to completely cover the first fixing portion 22. The first clearance space 30 prevents the rivet pin 2000 from protruding beyond the first fixing portion 22, thereby mitigating issues such as cracking or imprinting of the first insulating member 31 by the rivet pin 2000. This protects the first insulating member 31, thereby improving the reliability of the insulation seal between the housing 1 and the terminal 2, and thus the reliability of the battery cell 102. Furthermore, because the rivet pin 2000 can completely cover the first fixing portion 22, it can mitigate issues such as imprinting of the first fixing portion 22 and unsatisfactory flatness caused by the rivet pin 2000 not being able to fully press the first fixing portion 22.

[0106] In other words, by setting the area around the pole of the insulating part on the side of the riveted ejector pin 2000 as an air-avoidance step, the air-avoidance of the part of the riveted ejector pin 2000 that extends beyond the pole 2 is achieved, thereby improving the problem that the riveted ejector pin 2000 squeezes the insulating part on this side when the pole 2 is riveted, causing cracking and imprinting of the insulating part on this side. Thus, under the premise of protecting the first insulating part 31, the pole 2 according to the embodiment of the present application can be installed on the shell 1 by riveting, thereby improving the installation convenience and stability of the pole 2. However, it is worth noting that the pole 2 in the battery cell 102 of the embodiment of the present application is not limited to being installed by riveting. When the pole 2 is not installed by riveting, the first insulating part 31 with the air-avoidance surface 3121 of the embodiment of the present application can also be used.

[0107] In some embodiments, as shown in Figure 8 , the second portion 312 includes a protrusion 3122 that projects relative to the clearance surface 3121, away from the first housing wall 11. The clearance surface 3121 is disposed between the protrusion 3122 and the first fixing portion 22. Thus, the first fixing portion 22 and the protrusion 3122 are separated by a first clearance space 30 formed by the clearance surface 3121. While maintaining the protrusion requirements of the protrusion 3122, the problem of the protrusion 3122 being squeezed by the riveting pin 2000 is alleviated. It is worth noting that the function of the protrusion 3122 is not limited, and it can be used, for example, for reinforcement, avoidance, or resistance.

[0108] For example, in the orientation shown in Figures 7 and 8, the first fixing portion 22 is located below the first shell wall 11, the second fixing portion 23 is located above the first shell wall 11, the first insulating member 31 is located below the first shell wall 11, the first part 311 of the first insulating member 31 is located between the first fixing portion 22 and the first shell wall 11, the second part 312 of the first insulating member 31 is located in the outer peripheral area of ​​the first fixing portion 22, the second part 312 includes a clearance surface 3121 and a protrusion 3122, the protrusion 3122 protrudes downward relative to the clearance surface 3121, that is, the lower surface of the protrusion 3122 is lower than the clearance surface 3121, the clearance surface 3121 is located between the protrusion 3122 and the first fixing portion 22, so that the first clearance space 30 formed below the clearance surface 3121 can play a role in separating the protrusion 3122 and the first fixing portion 22, thereby improving the riveting ejector 2000 from squeezing the protrusion 3122 upward.

[0109] In some embodiments, referring to Figures 6 and 7 , the active material coating portion 41 is located on the inner side of the first shell wall 11, the first insulating member 31 is disposed on the inner side of the first shell wall 11, the protrusion 3122 includes a first protrusion 3123, the first protrusion 3123 includes a second surface 31231 disposed away from the first shell wall 11, the second surface 31231 is further away from the first shell wall 11 than the first surface 221, and the second surface 31231 abuts the active material coating portion 41. Thus, by providing the first protrusion 3123 abutting the active material coating portion 41, the first insulating member 31 can improve the installation stability of the active material coating portion 41 within the shell 1 and reduce the risk of shorting between the active material coating portion 41 and the terminal 2, thereby improving the reliability of the battery cell 102.

[0110] For example, in the orientation shown in Figures 6 and 7, the active material coating portion 41, the first fixing portion 22 and the first insulating member 31 are all located below the first shell wall 11, the first portion 311 of the first insulating member 31 is located between the first fixing portion 22 and the first shell wall 11, and the second portion 312 of the first insulating member 31 is located in the outer peripheral area of ​​the first fixing portion 22. The second portion 312 includes a clearance surface 3121 and a first convex portion 3123. The first convex portion 3123 protrudes downward relative to the clearance surface 3121, and the lower surface of the first convex portion 3123 is the second surface 312. 31. The lower surface of the first fixing portion 22 is the first surface 221. The air-avoiding surface 3121 is higher than the lower surface of the first fixing portion 22. The second surface 31231 is lower than the lower surface of the first fixing portion 22 (that is, the second surface 31231 is farther away from the first shell wall 11 relative to the first surface 221). The lower surface of the first fixing portion 22 abuts the upper surface of the active material coating portion 41. The lower surface of the first fixing portion 22 is higher than the upper surface of the active material coating portion 41 to improve the short circuit between the electrode 2 and the active material coating portion 41 and improve the reliability of the battery cell 102.

[0111] It is worth noting that the number and distribution positions of the first protrusions 3123 are not limited. For example, in some embodiments, there are multiple first protrusions 3123 and they are arranged at intervals, so that the abutment against the active material coating part 41 can be achieved from multiple positions, further improving the installation stability of the active material coating part 41 in the shell 1, further reducing the risk of short circuit between the active material coating part 41 and the pole 2, and improving the reliability of the battery cell 102.

[0112] Exemplarily, the surface of the active material coating portion 41 facing the first shell wall 11 is the abutment surface of the active material coating portion 41, and the plurality of first protrusions 3123 can be distributed at intervals along the contour line of the abutment surface of the active material coating portion 41, thereby achieving a more reliable abutment and limiting effect.

[0113] Of course, the present application is not limited thereto. For example, in other embodiments of the present application, the first protrusion 3123 may be processed into a ring shape and abut against the active material coating portion 41 .

[0114] In some embodiments, referring to Figures 6 and 7 , a pressure relief structure 7 is provided on the first shell wall 11, and the protrusion 3122 includes a second protrusion 3124. The second protrusion 3124 is located at a position corresponding to the pressure relief structure 7, forming a concave cavity 31241 that is open toward the pressure relief structure 7. Thus, the first insulating member 31 defines the concave cavity 31241 by providing the second protrusion 3124, so that the first insulating member 31 does not cling to the pressure relief structure 7. Instead, a certain space is provided between the first insulating member 31 and the pressure relief structure 7, allowing generated gas to enter the concave cavity 31241, thereby improving the reliability of the pressure relief structure 7 opening valve to relieve pressure and improving the operating reliability of the battery cell 102.

[0115] For example, referring to the orientation shown in Figures 6 and 7 , the first fixing portion 22 and the first insulating member 31 are both located below the first shell wall 11. The first portion 311 of the first insulating member 31 is located between the first fixing portion 22 and the first shell wall 11. The second portion 312 of the first insulating member 31 is located in the outer peripheral area of ​​the first fixing portion 22. The second portion 312 includes a clearance surface 3121 and a second protrusion 3124. The second protrusion 3124 protrudes downward relative to the clearance surface 3121. The second protrusion 3124 forms an upwardly open concave cavity 31241 at a position corresponding to the pressure relief structure 7. As a result, a certain space can be provided between the upper surface of the first insulating member 31 and the lower surface of the pressure relief structure 7, thereby improving the close contact between the first insulating member 31 and the pressure relief structure 7, thereby improving the reliability of the pressure relief structure 7 in opening the valve to relieve pressure, and improving the operating reliability of the battery cell 102.

[0116] It is worth noting that the specific form of the pressure relief structure 7 is not limited. For example, it can be an explosion-proof valve mounted on the first housing wall 11, or a structure in which a portion of the first housing wall 11 is machined into a notched structure. Furthermore, the term "the position of the second protrusion 3124 corresponding to the pressure relief structure 7" should be understood broadly, and can include at least a portion of the area covered by the orthographic projection of the pressure relief structure 7 on the first insulating member 31.

[0117] 6 and 7 , the second protrusion 3124 includes a third surface 31242 disposed away from the first shell wall 11. The third surface 31242 is disposed further away from the first shell wall 11 relative to the first surface 221, or is flush with the first surface 221. Thus, by disposing the side surface of the second protrusion 3124 away from the first shell wall 11 further away from the first shell wall 11 relative to the first surface 221, or being flush with the first surface 221, the second protrusion 3124 can protrude a greater distance away from the first shell wall 11. This allows the formation of a relatively deep cavity 31241 while ensuring that the wall thickness of the second protrusion 3124 is not too thin, thereby better balancing the structural reliability of the first insulating member 31 and the reliability of the pressure relief structure 7 when the valve is opened and the pressure is relieved.

[0118] For example, in the orientation shown in Figures 6 and 7, the first fixing portion 22 and the first insulating member 31 are both located below the first shell wall 11, the first portion 311 of the first insulating member 31 is located between the first fixing portion 22 and the first shell wall 11, the second portion 312 of the first insulating member 31 is located in the outer peripheral area of ​​the first fixing portion 22, the second portion 312 includes a clearance surface 3121 and a second convex portion 3124, the second convex portion 3124 protrudes downward relative to the clearance surface 3121, the lower surface of the second convex portion 3124 is the third surface 31242, the lower surface of the first fixing portion 22 is the first surface 221, and the third surface 3124 is the lower surface of the first fixing portion 22. 2 is lower than the first surface 221 (that is, the third surface 31242 is arranged farther away from the first shell wall 11 than the first surface 221), or the third surface 31242 is flush with the first surface 221. In this way, while ensuring that the wall thickness of the second protrusion 3124 in the vertical direction is not too small, the depth of the concave cavity 31241 formed above the second protrusion 3124 in the vertical direction can be relatively large, thereby improving the reliability of the pressure relief structure 7 in opening the valve to relieve pressure. Moreover, since the wall thickness of the first insulating member 31 at the second protrusion 3124 is not too small, the reliability of the overall structure of the first insulating member 31 can be improved.

[0119] In some embodiments of the present application, the protrusion 3122 may include the first protrusion 3123 of any of the above embodiments and the second protrusion 3124 of any of the above embodiments, which will not be described in detail here.

[0120] In some embodiments, referring to Figures 7 and 8 , the clearance surface 3121 ensures that the spacing W between the first fixing portion 22 and the protrusion 3122 is greater than or equal to 1 mm. That is, the dimension of the first clearance space 30 in the spacing direction between the first fixing portion 22 and the protrusion 3122 is greater than or equal to 1 mm. Thus, by providing the clearance surface 3121 to ensure that the spacing between the first fixing portion 22 and the protrusion 3122 is greater than or equal to 1 mm, more space is reserved, allowing the coverage area of ​​the rivet pin 2000 to be substantially larger than the coverage area of ​​the first fixing portion 22. This ensures that the rivet pin 2000 fully covers the first fixing portion 22 while meeting the tooling positioning tolerance requirements, while ensuring that the spacing between the first fixing portion 22 and the protrusion 3122 is sufficiently clear. This reduces the pressure of the rivet pin 2000 on the protrusion 3122 during riveting, thereby reducing problems such as cracking or coining of the first insulating member 31.

[0121] 9 , considering the tooling positioning tolerance during the riveting process, and to address the problem of the rivet pin 2000 not being able to fully cover the first fixing portion 22 due to the positioning tolerance, the coverage range of the rivet pin 2000 can be set to extend beyond the first fixing portion 22. For example, the rivet pin 2000 can be set to extend beyond the first fixing portion 22 by a dimension S greater than or equal to 0.5 mm, thereby better meeting the requirement that the rivet pin 2000 fully covers the first fixing portion 22, i.e., enabling the rivet pin 2000 to more reliably press the entire first fixing portion 22. Based on this design, by setting the size of the clearance surface 3121 so that the spacing W between the first fixing portion 22 and the protrusion 3122 is greater than or equal to 1 mm, the portion of the rivet pin 2000 that extends beyond the first fixing portion 22 can correspond to the first clearance space 30, effectively alleviating the problem of the rivet pin 2000 squeezing the protrusion 3122. In addition, it is worth mentioning that since the protrusions included in the protrusion 3122 may have various forms, the upper limit of the distance between the first fixing portion 22 and the protrusion 3122 can be set according to actual conditions, which will not be elaborated here.

[0122] In some embodiments, referring to FIG7 , the height difference H between the air-avoiding surface 3121 and the first surface 221 is greater than or equal to 0.5 mm. It is understood that the height difference H refers to the dimension in the direction parallel to the axial direction of the pole 2. It is understood that during the riveting process, the riveting ejector pin 2000 needs to move a certain distance toward the air-avoiding surface 3121. By setting the height difference H between the air-avoiding surface 3121 and the first surface 221 to be greater than or equal to 0.5 mm, there is sufficient height space to avoid the riveting ejector pin 2000. This can achieve air-avoidance for the riveting ejector pin 2000 while meeting the riveting requirements of the pole 2, thereby protecting the first insulating member 31.

[0123] In addition, the upper limit of the height difference H between the air avoidance surface 3121 and the first surface 221 can be limited according to the wall thickness of the first insulating part 31. For example, in some embodiments, the height difference H between the air avoidance surface 3121 and the first surface 221 can also be less than or equal to 1 mm. Therefore, under the premise that the wall thickness of the first insulating part 31 is relatively conventional, the wall thickness of the first insulating part 31 at the step surface can be more effectively improved, thereby helping to improve the structural reliability of the first insulating part 31.

[0124] In some embodiments of the present application, referring to Figure 8, the battery cell 102 also includes: a second insulating member 32 and an insulating seal 33. The second insulating member 32 is arranged on the side of the first shell wall 11 facing the second fixed portion 23, and is at least partially sandwiched between the second fixed portion 23 and the first shell wall 11. The insulating seal 33 is arranged between the first shell wall 11 and the pole 2, and is located on the side of the second insulating member 32 close to the first fixed portion 22, and on the side of the first insulating member 31 close to the penetration portion 21. The insulating seal 33 is an elastic member and is elastically compressed to seal between the first fixed portion 22 and the first shell wall 11.

[0125] In the above technical solution, when the pole 2 and the first housing wall 11 are assembled, the insulating seal 33 is squeezed by the first fixing portion 22 and the first housing wall 11, presenting a compressed state. As a result, the sealing portion 331 can, under the action of its own elastic force, cling tightly to the first fixing portion 22 and the first housing wall 11, thereby achieving a seal between the housing 1 and the pole 2, and thus an insulating seal between the first housing wall 11 and the pole 2. Furthermore, because the insulating seal 33 is also made of an insulating material, the first fixing portion 22 and the first housing wall 11 can be insulated by the first insulating member 31, and the second fixing portion 23 and the first housing wall 11 can be insulated by the second insulating member 32 and the insulating seal 33, thereby improving the insulating seal between the housing 1 and the pole 2.

[0126] In some embodiments of the present application, referring to Figure 8, the first insulating member 31 is located on the inner side of the first shell wall 11, and the side of the air avoidance surface 3121 away from the first shell wall 11 forms a first air avoidance space 30, and a first channel S1 connected to the first air avoidance space 30 is formed between the first insulating member 31 and the first fixed portion 22, and a second channel S2 connected to the outside of the shell 1 is formed between the second insulating member 32 and the second fixed portion 23 or the first shell wall 11, and the connection position between the second channel S2 and the first channel S1 is blocked by the insulating seal 33.

[0127] Specifically, since the insulating seal 33 is provided between the first shell wall 11 and the pole 2, and is located on the side of the second insulating member 32 close to the first fixing portion 22, and on the side of the first insulating member 31 close to the penetration portion 21, the position of the insulating seal 33 is relatively hidden, and it is difficult to directly detect whether the insulating seal 33 is missing by observation. However, in this embodiment, by providing the second channel S2 and the first channel S1, it is possible to detect whether the insulating seal 33 is missing by ventilation detection of whether the second channel S2 and the first channel S1 are connected, thereby ensuring that the pole 2 and the first shell wall 11 can be reliably sealed.

[0128] For example, during detection, a detection gas, such as helium, can be introduced from the inside of the shell 1, and then the change in the concentration of helium in the air can be detected from the outside of the shell 1 to determine whether the second channel S2 and the first channel S1 are connected. If the concentration is almost unchanged, it means that the connection position between the second channel S2 and the first channel S1 is blocked by the insulating seal 33, the insulating seal 33 has been installed in place, and the second channel S2 and the first channel S1 are not connected. Therefore, the helium introduced into the interior of the shell 1 will not leak along the first channel S1 and the second channel S2 to the outside of the shell 1; if the concentration changes significantly, it means that the connection position between the second channel S2 and the first channel S1 is not blocked by the insulating seal 33, the insulating seal 33 is not installed, and the second channel S2 and the first channel S1 are in a connected state. Therefore, the helium introduced into the interior of the shell 1 will leak along the first channel S1 and the second channel S2 to the outside of the shell 1.

[0129] In some embodiments of the present application, referring to FIG8 , the first insulating member 31 includes a first groove 315 that opens toward the first fixing portion 22 , and the first groove 315 defines at least a portion of the first channel S1 . The second insulating member 32 includes a second groove 325 that opens toward the first housing wall 11 , and the second groove 325 defines at least a portion of the second channel S2 . Thus, by machining the first groove 315 on the first insulating member 31 and the second groove 325 on the second insulating member 32 , the first channel S1 and the second channel S2 can be constructed simply and conveniently, thereby reducing machining and assembly difficulty and improving production efficiency. Of course, the present application is not limited to this. For example, in other embodiments of the present application, the first channel S1 or the second channel S2 can also be obtained by machining grooves on the pole 2 or the first housing wall 11 .

[0130] In some embodiments of the present application, the depth of the first groove 315 and the second groove 325 are both in the range of 0.2 mm to 0.35 mm, for example, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, etc., and the width of the first groove 315 and the second groove 325 are both in the range of 0.2 mm to 0.5 mm, for example, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, etc. It can be understood that the direction of airflow through the first channel S1 is the direction of the groove length of the first groove 315, and the direction of airflow through the second channel S2 is the direction of the groove length of the second groove 325. By defining the groove depth and groove width of the first groove 315 and the second groove 325 as above, both processing requirements and testing requirements can be met.

[0131] In some embodiments of the present application, referring to FIG8 , a plurality of first channels S1 and a plurality of second channels S2 are spaced apart around the pole 2, and the positions of the plurality of first channels S1 and the plurality of second channels S2 correspond one-to-one. This reduces the risk of a single channel being blocked by foreign matter and unable to be properly detected, allowing for smooth and reliable detection of missing insulation seals. Of course, the present application is not limited thereto. For example, in other embodiments of the present application, at least one of the first channel S1 and the second channel S2 can be processed into an annular channel arranged around the entire circumference of the pole 2.

[0132] In some embodiments of the present application, referring to FIG8 , first channels S1 are provided on opposite sides of the pole 2, and the number of second channels S2 is the same as and the positions of the first channels S1 are corresponding. For example, the first channels S1 may be provided on opposite sides in the length direction of the cross section of the pole 2, or on opposite sides in the width direction of the cross section of the pole 2.

[0133] This facilitates the non-directional installation of the first insulating member 31 and the first insulating member 32, thereby achieving foolproof operation, reducing assembly difficulty, and improving assembly efficiency. It is worth noting that if only one first channel S1 is provided (for example, the first insulating member 31 is provided with the first groove 315 on only one side of the cross-section of the pole 2 in the longitudinal direction) and only one second channel S2 is provided (for example, the second insulating member 32 is provided with the second groove 325 on only one side of the cross-section of the pole 2 in the longitudinal direction), if one of the first insulating member 31 and the first insulating member 32 is installed upside down (resulting in the first groove 315 and the second groove 325 being located on opposite sides of the cross-section of the pole 2 in the longitudinal direction), the positions of the first channel S1 and the second channel S2 will not correspond, making it impossible to detect missing installation.

[0134] In some embodiments of the present application, referring to FIG8 , the insulating seal 33 includes a sealing portion 331 disposed between the first fixing portion 22 and the first housing wall 11. The sealing portion 331 is positioned closer to the penetration portion 21 relative to the first portion 311 and is elastically compressed to provide a sealing fit between the first fixing portion 22 and the first housing wall 11. The insulating seal 33 also includes an insulating portion 332 disposed between the penetration portion 21 and the first housing wall 11. The end of the insulating portion 332, distal from the first fixing portion 22, abuts against the second insulating member 32. This improves the insulation between the first housing wall 11 and the pole 2, alleviating the short circuit problem.

[0135] In some embodiments of the present application, referring to Figure 8, the first part 311 includes a first section 3111 and a second section 3112, the first section 3111 is clamped between the first fixing portion 22 and the first shell wall 11, the second section 3112 is connected to the side of the first section 3111 close to the penetrating portion 21, and the second section 3112 is spaced apart from the first fixing portion 22 to form a second air avoidance space 316 between the second section 3112 and the first fixing portion 22, and a part 3311 of the insulating seal 33 (for example, the sealing portion 331) extends into the second air avoidance space 316.

[0136] Therefore, by providing the second air-avoiding space 316 , the insulating seal 33 can be fully compressed to reliably seal the gap between the first fixing portion 22 and the first shell wall 11 , thereby improving the sealing performance between the shell 1 and the pole 2 .

[0137] In some embodiments of the present application, as shown in FIG10 , a battery cell 102 has a receiving cavity 10 formed on the inner side of the first shell wall 11, and a receiving groove 25 is formed on the terminal 2, which is open in a direction away from the receiving cavity 10. The terminal 2 has a connecting hole 26, which passes through the groove wall of the receiving groove 25 on the side adjacent to the receiving cavity 10 and connects the receiving cavity 10 with the receiving groove 25. For example, when the penetration portion 21 is annular, the receiving groove 25 is located in the inner ring region of the penetration portion 21. For example, the receiving groove 25 can be jointly defined by the penetration portion 21 and a support portion 27 located in the inner ring region of the penetration portion 21.

[0138] Thus, when the electrolyte is injected into the battery cell 102, the electrolyte can be injected into the receiving groove 25 and then flow toward the receiving cavity 10 through the connecting hole 26, wherein the receiving groove 25 can play the role of buffering the electrolyte to improve the problems of electrolyte splashing, overflowing, etc. Moreover, the side wall of the receiving groove 25 (that is, the groove wall extending from the notch of the receiving groove 25 toward the receiving cavity 10) can block the electrolyte from splashing to a certain extent, reduce the pollution caused by the electrolyte to the outside, and facilitate rapid injection. Moreover, since there is no need to open a separate injection channel on the shell 1, there is no need to perform special processing on the shell 1, which is conducive to reducing the structural complexity and processing difficulty of the shell 1.

[0139] In some embodiments of the present application, as shown in Figure 10, the battery cell 102 includes a cell assembly 4, the cell assembly 4 includes an active material coating portion 41 received in the accommodating cavity 10, and a conductive portion 42 connected to the active material coating portion 41, and the conductive portion 42 is passed through the connecting hole 26 to be at least partially received in the accommodating groove 25.

[0140] It is worth noting that there may be one or more communicating holes 26, and the conductive portion 42 may be provided through at least one of the communicating holes 26. For example, at least one communicating hole 26 is capable of passing electrolyte. For example, at least one communicating hole 26 is left vacant (i.e., not provided with the conductive portion 42), thereby enabling electrolyte to pass through without being obstructed by the conductive portion 42. For another example, at least one communicating hole 26 is still capable of passing electrolyte after being provided with the conductive portion 42.

[0141] Therefore, by accommodating at least a portion of the conductive part 42 in the receiving groove 25, at least a portion of the conductive part 42 occupies the space in the receiving groove 25, thereby reducing the space occupied by the conductive part 42 in the receiving cavity 10, saving space in the receiving cavity 10 to accommodate a larger volume of the active material coating part 41, thereby facilitating the improvement of the energy density of the battery cell 102, or reducing the size of the battery cell 102 when the energy density of the battery cell 102 remains unchanged.

[0142] In some embodiments, the conductive portion 42 is welded to the pole 2 to form an electrical connection, thereby enabling the battery cell assembly 4 to output from the electrode at the pole 2. For example, as shown in FIG10 , the conductive portion 42 is welded to the side wall of the accommodating groove 25 close to the accommodating cavity 10, thereby improving the compactness of the fit and facilitating the welding operation of the two. Of course, the present application is not limited to this. In other embodiments, the conductive portion 42 can also be configured to be welded to the pole cover plate 5 mentioned later to form an electrical connection, which is not limited here.

[0143] In some embodiments, as shown in Figures 10 and 11, a battery cell 102 includes a terminal cover plate 5 that covers the receiving slot 25. The terminal cover plate 5 is formed with an injection hole 51 that communicates with the receiving slot 25. The battery cell 102 also includes a sealing structure 6 for sealing the injection hole 51. Thus, when electrolyte needs to be injected into the battery cell 102, the sealing structure 6 is not installed at the injection hole 51, or the sealing structure 6 is in a state of opening the injection hole 51. In this case, the electrolyte can be injected into the receiving slot 25 through the injection hole 51. After the electrolyte is injected, the sealing structure 6 can be installed at the injection hole 51, or the sealing structure 6 can be switched to a state of closing the injection hole 51, thereby sealing and closing the injection hole 51 to prevent electrolyte overflow and prevent foreign matter from entering the receiving chamber 10 through the injection hole 51, thereby improving the reliability of the battery cell 102.

[0144] Therefore, by processing the injection hole 51 on the pole cover 5, the opening is relatively small and located outside, and the injection inlet can be reliably sealed more easily through the sealing structure 6, thereby improving the working reliability of the battery cell 102 and realizing a flexible and diversified design of the sealing structure 6.

[0145] In some embodiments, as shown in FIG11 , the pole cover 5 does not have a portion that stops at the outside of the sealing structure 6 (i.e., the side away from the accommodating cavity 10 ), so that the sealing structure 6 is suitable for being installed to the pole cover 5 from the outside of the pole cover 5 (i.e., the side away from the accommodating cavity 10 ). In this way, by setting the sealing structure 6 to be installed to the pole cover 5 from the outside to seal the liquid injection hole 51, the sealing structure 6 can be installed after liquid injection, which can ensure the sealing of the liquid injection hole 51. The installation position is close to the outside, which facilitates the rapid assembly of the sealing structure 6. Moreover, the installation of the sealing structure 6 will not adversely affect the connection between the pole 2 and the pole cover 5, thereby ensuring the reliability of the connection between the pole cover 5 and the pole 2.

[0146] The sealing structure 6 can be detachable or fixed. For example, when the sealing structure 6 is detachable, it is convenient for maintaining the injection hole 51. For example, when the electrolyte needs to be replenished, the sealing structure 6 can be removed, the injection hole 51 can be opened, and the electrolyte can be replenished into the accommodating cavity 10 through the injection hole 51. Then, the sealing structure 6 can be reinstalled. For example, the sealing structure 6 can be detachably connected to the pole cover 5 by means of threads or screws, thereby facilitating disassembly and assembly.

[0147] For example, when the sealing structure 6 is in a non-detachable fixed form, the sealing structure 6 can be fixed to the pole cover 5 by welding, riveting, or the like, thereby improving the sealing reliability of the sealing structure 6 with respect to the liquid injection hole 51. For example, the liquid injection hole 51 can be in a multi-segment form, and the sealing structure 6 can include a first sealing member 61 that has an interference fit with the liquid injection hole 51, and a second sealing member 62 that covers the first sealing member 61 and is welded to the pole cover 5. Alternatively, in some embodiments, the second sealing member 62 can be configured to be detachably connected to the pole cover 5 by means of a screw-on fastener, so as to restrict the first sealing member 61 to a position that has an interference fit with the liquid injection hole 51.

[0148] In some embodiments of the present application, as shown in FIG11 , at least a portion of the sealing structure 6 is embedded in the liquid injection hole 51. That is, the sealing structure 6 can be entirely embedded in the liquid injection hole 51, or only a portion of the sealing structure 6 can be embedded in the liquid injection hole 51. Thus, on the one hand, the space within the liquid injection hole 51 can be fully utilized, thereby improving the sealing reliability of the sealing structure 6 on the liquid injection hole 51. On the other hand, the height of the sealing structure 6 protruding from the liquid injection hole 51 can be reduced, thereby reducing the space occupied by the sealing structure 6 outside the pole cover 5, thereby reducing the interference effect on the current collecting component, increasing the connection area between the current collecting component and the pole cover 5, and improving the flow efficiency.

[0149] In some embodiments of the present application, as shown in Figures 5 and 6 , a plurality of poles 2 are provided on the first housing wall 11, and the second portion 312 includes a clearance surface 3121 respectively provided around each first fixing portion 22. Thus, the plurality of poles 2 on the first housing wall 11 can be installed by riveting, and each pole 2 is less likely to cause cracking or stamping of the first insulating member 31 during installation, further improving the reliability of the first insulating member 31.

[0150] Exemplarily, the number of poles 2 on the first shell wall 11 is two, and they are a first pole and a second pole with opposite polarities, that is, one of the first pole and the second pole is a positive pole and the other is a negative pole, and both poles are installed on the first shell wall 11, which is beneficial to improving the production efficiency of the battery cell 102.

[0151] In some embodiments of the present application, as shown in FIG4 , the housing 1 includes a body 1a and an end cap 1b. The body 1a defines a housing cavity 10 that opens toward the end cap 1b. The end cap 1b seals the opening of the housing cavity 10. The first housing wall 11 is a wall portion of the body 1a disposed opposite the end cap 1b. For example, the body 1a further includes a second housing wall 13 that extends relative to the first housing wall 11 toward the end cap 1b to define the housing cavity 10 between the first and second housing walls 11 and 13. The first and second housing walls 11 and 13 are integrally formed. Thus, the structure of the housing 1 is simple and easy to process. Furthermore, by arranging the pole 2 on the side of the body 1a opposite the end cap 1b, the connection between the body 1a and the end cap 1b can be kept away from the pole 2. Of course, the present application is not limited thereto. For example, in other embodiments of the present application, the end cap 1b can serve as the first housing wall 11, and the pole 2 can be mounted on the end cap 1b.

[0152] In some embodiments of the present application, as shown in Figures 4, 6, and 7, a housing 1 is formed with a receiving cavity 10, the first fixing portion 22 is located on a side of the first housing wall 11 facing the receiving cavity 10, and the second fixing portion 23 is riveted to the first housing wall 11. Thus, riveting can be performed from the outside of the housing 1a, facilitating the riveting operation.

[0153] Exemplarily, since the first insulating part 31 can be an insulating part placed on the inner side of the first shell wall 11, the insulating part on this side can be provided with a protrusion 3122 to play a role in abutting against the active material coating part 41 or avoiding the pressure relief structure 7, etc. At this time, by providing an air avoidance surface 3121 surrounding the first fixing part 22 on the first insulating part 31, the protrusion 3122 can be protected.

[0154] According to the second embodiment of the present application, the present embodiment further provides a battery 100, comprising a battery cell 102 according to any of the above-described solutions. It is worth noting that the battery 100 according to the embodiment of the present application may or may not include a housing 101. Therefore, since the reliability of the battery cell 102 according to the embodiment of the present application is improved, the performance of the battery 100 is thereby improved.

[0155] For example, the battery 100 may further include a busbar component, and there are multiple battery cells 102, with at least two of them being electrically connected via the busbar component. This allows for the series and / or parallel connection of multiple battery cells 102. For example, when multiple battery cells 102 are connected in series, the anode terminal cover 5 of one battery cell 102 is connected to the cathode terminal cover 5 of the next battery cell 102 via one busbar component, while the cathode terminal cover 5 of the battery cell 102 is connected to the anode terminal cover 5 of the previous battery cell 102 via another busbar component.

[0156] According to a third embodiment of the present application, an electrical device is provided, comprising a battery 100 according to any of the aforementioned solutions, wherein the battery 100 is configured to provide electrical energy to the electrical device. The electrical device may be any of the aforementioned devices or systems employing the battery 100. The improved performance of the battery 100 facilitates improved operating performance of the electrical device.

[0157] Next, a battery cell 102 according to a specific embodiment of the present application is described.

[0158] The battery cell 102 includes a housing 1, a terminal 2, and a sealed insulating assembly 3. The housing 1 includes a body 1a and an end cap 1b. The body 1a defines a receiving cavity 10 that opens toward the end cap 1b. The end cap 1b seals the opening of the receiving cavity 10. The wall of the body 1a opposite the end cap 1b is a first wall 11. Two terminals 2, one positive and one negative, are provided on the first wall 11. The terminal 2 includes a penetration portion 21 extending through the first wall 11, and a first fixing portion 22 and a second fixing portion 23 connected to the penetration portion 21 and disposed on the inner and outer sides of the first wall 11, respectively. The sealed insulating assembly 3 includes a first insulating member 31, a second insulating member 32, and an insulating seal 33. The first insulating member 31 is disposed on the inner side of the first wall 11, the second insulating member 32 is disposed on the outer side of the first wall 11, and the insulating seal 33 is disposed on the side of the first insulating member 31 near the penetration portion 21. The first insulating member 31 includes a first portion 311 located between the first fixing portion 22 and the first housing wall 11 , and a second portion 312 located in an outer peripheral area of ​​the first fixing portion 22 .

[0159] The second portion 312 includes a clearance surface 3121 arranged around the first fixing portion 22. When the first shell wall 11 serves as the top wall of the shell 1, the lower surface of the first fixing portion 22 is the first surface 221, and the clearance surface 3121 is higher than the first surface 221. The second portion 312 also includes a protrusion 3122 that protrudes downward relative to the clearance surface 3121. The clearance surface 3121 is arranged between the protrusion 3122 and the first fixing portion 22. The protrusion 3122 includes a first protrusion 3123, and the lower surface of the first protrusion 3123 abuts the active material coating portion 41. A pressure relief structure 7 is provided on the first shell wall 11. The protrusion 3122 also includes a second protrusion 3124. The second protrusion 3124 forms an upwardly open concave cavity 31241 at a position corresponding to the pressure relief structure 7.

[0160] Thus, by designing the surface of the first insulating member 31, which surrounds the first fixing portion 22 and is away from the first housing wall 11, as a clearance surface 3121, a first clearance space 30 is formed on the side of the clearance surface 3121 away from the first housing wall 11. This allows the rivet pin 2000 to completely cover the first fixing portion 22, while utilizing the first clearance space 30 to prevent the rivet pin 2000 from protruding beyond the first fixing portion 22. This mitigates issues such as cracking or coining caused by the rivet pin 2000 on the protruding portion 3122, thereby protecting the first insulating member 31 and improving the reliability of the insulation seal between the housing 1 and the terminal 2, thereby enhancing the reliability of the battery cell 102. Furthermore, since the rivet pin 2000 can completely cover the first fixing portion 22, issues such as coining or failing to meet flatness standards caused by the rivet pin 2000 not fully pressing the first fixing portion 22 can be mitigated.

[0161] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0162] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, wherein, Comprising: A housing, including a first housing wall; A terminal post, including a penetrating portion penetrating through the first housing wall, and a first fixing portion and a second fixing portion connected to the penetrating portion and respectively disposed on two sides in the wall thickness direction of the first housing wall, the first fixing portion including a first surface facing away from the first housing wall; A first insulating member, disposed on a side of the first housing wall facing the first fixing portion, and including a first portion located between the first fixing portion and the first housing wall, and a second portion located in an outer peripheral region of the first fixing portion; Wherein, the second portion includes a clearance surface disposed around the first fixing portion, and the clearance surface is disposed closer to the first housing wall than the first surface.

2. The battery cell according to claim 1, wherein, The second portion includes a protruding portion protruding in a direction away from the first housing wall relative to the clearance surface, and the clearance surface is disposed between the protruding portion and the first fixing portion.

3. The battery cell according to claim 2, wherein, The battery cell includes an active material coating portion located inside the first housing wall, the first insulating member is disposed inside the first housing wall, the protruding portion includes a first convex portion, the first convex portion includes a second surface facing away from the first housing wall, and the second surface is farther away from the first housing wall than the first surface to abut against the active material coating portion.

4. The battery cell according to claim 3, wherein, The first convex portions are multiple and spaced apart.

5. The battery cell according to any one of claims 2-4, wherein, A pressure relief structure is provided on the first housing wall, the protruding portion includes a second convex portion, and the second convex portion forms a concave cavity opening in a direction towards the pressure relief structure at a position corresponding to the pressure relief structure.

6. The battery cell according to claim 5, wherein The second convex portion includes a third surface facing away from the first housing wall, and the third surface is farther away from the first housing wall than the first surface, or is flush with the first surface.

7. The battery cell according to any one of claims 2-6, wherein, The clearance surface makes the distance between the first fixing portion and the protruding portion greater than or equal to 1 mm.

8. The battery cell according to any one of claims 1-7, wherein, The height difference between the clearance surface and the first surface is greater than or equal to 0.5 mm.

9. The battery cell according to claim 8, wherein, The height difference between the clearance surface and the first surface is also less than or equal to 1 mm.

10. The battery cell according to any one of claims 1-9, wherein, Further comprising: A second insulating member, disposed on a side of the first housing wall facing the second fixing portion, and at least partially clamped between the second fixing portion and the first housing wall; and An insulating seal, disposed between the first housing wall and the terminal post, and located on a side of the second insulating member close to the first fixing portion and a side of the first insulating member close to the penetrating portion, the insulating seal being an elastic member and elastically compressed to be sealed between the first fixing portion and the first housing wall.

11. The battery cell according to claim 10, wherein, The first insulating member is located inside the first housing wall, a first clearance space is formed on a side of the clearance surface away from the first housing wall, a first channel communicating with the first clearance space is formed between the first insulating member and the first fixing portion, a second channel communicating with the outside of the housing is formed between the second insulating member and the second fixing portion or the first housing wall, and the communication position between the second channel and the first channel is blocked by the insulating seal.

12. The battery cell according to claim 11, wherein, The first insulating member has a first groove opening towards the first fixing portion, and the first groove defines at least a part of the first channel. The second insulating member has a second groove opening towards the first housing wall, and the second groove defines at least a part of the second channel.

13. The battery cell according to claim 12, wherein, The depth of the first groove and the second groove ranges from 0.2 mm to 0.35 mm, and the width of the first groove and the second groove ranges from 0.2 mm to 0.5 mm.

14. The battery cell according to any one of claims 11-13, wherein, A plurality of the first channels are arranged at intervals around the pole column, and a plurality of the second channels are arranged at intervals. The positions of the plurality of first channels and the plurality of second channels correspond to each other one by one.

15. The battery cell according to claim 14, wherein, The first channels are respectively provided on opposite sides of the pole column. The number of the second channels is the same as that of the first channels and their positions correspond.

16. The battery cell according to any one of claims 10-15, wherein, The insulating seal includes a sealing portion provided between the first fixing portion and the first housing wall, and an insulating portion provided between the penetrating portion and the first housing wall. The sealing portion is arranged closer to the penetrating portion than the first portion and is elastically compressed to be sealingly fitted between the first fixing portion and the first housing wall. One end of the insulating portion away from the first fixing portion abuts against the second insulating member.

17. The battery cell according to any one of claims 10-16, wherein, The first portion includes a first section and a second section. The first section is clamped between the first fixing portion and the first housing wall. The second section is connected to the side of the first section close to the penetrating portion, and the second section is spaced from the first fixing portion to form a second clearance space between the second section and the first fixing portion. A part of the insulating seal extends into the second clearance space.

18. The battery cell according to any one of claims 1-17, wherein, An accommodation cavity is formed in the housing. An accommodation groove is formed on the pole column and opens in a direction away from the accommodation cavity. The pole column has a communication hole that penetrates the groove wall of the accommodation groove close to the accommodation cavity and communicates the accommodation cavity with the accommodation groove.

19. The battery cell according to claim 18, wherein, The battery cell includes a battery cell component. The battery cell component includes an active material coating portion received in the accommodation cavity and a conductive portion connected to the active material coating portion. The conductive portion penetrates through the communication hole and is at least partially received in the accommodation groove.

20. The battery cell according to claim 18 or 19, wherein, The battery cell includes a pole column cover plate covering the accommodation groove. A liquid injection hole communicating with the accommodation groove is formed on the pole column cover plate. The battery cell further includes a sealing structure for sealing the liquid injection hole.

21. The battery cell according to any one of claims 1-20, wherein, A plurality of the pole columns are provided on the first housing wall. The second portion includes clearance surfaces respectively arranged around each of the first fixing portions.

22. The battery cell according to claim 21, wherein, The number of the pole columns on the first housing wall is two and their polarities are opposite.

23. The battery cell according to any one of claims 1-22, wherein, The housing includes a housing body and an end cover. The housing body defines an accommodation cavity opening towards the end cover. The end cover seals the opening of the accommodation cavity. The first housing wall is a wall portion of the housing body opposite to the end cover.

24. The battery cell according to claim 23, wherein, The first fixing portion is located on the side of the first housing wall towards the accommodation cavity, and the second fixing portion is riveted to the first housing wall.

25. A battery, wherein, Comprising a battery cell according to any one of claims 1-24.

26. An electrical device, wherein, Comprising a battery according to claim 25.

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