Battery cell, battery, and electrical apparatus

Abstract

A battery cell (102), a battery (100), and an electrical apparatus, belonging to the technical field of batteries. The battery cell (102) comprises: a first housing wall (11), electrode columns (2), and sealing insulation assemblies (3). The first housing wall (11) is provided with mounting holes (12). The electrode columns (2) comprise penetrating portions (21) arranged in the mounting holes (12) in a penetrating manner, and first abutting portions (22) and second abutting portions (23) connected to the penetrating portions (21) and abutting against two sides of the first housing wall (11). The first abutting portions (22) abut against the first housing wall (11) by means of riveting. The sealing insulation assemblies (3) are insulated and fitted between the electrode columns (2) and the first housing wall (11), and comprise first insulating pieces (31) at least partially arranged between the first abutting portions (22) and the first housing wall (11), and second insulating pieces (32) at least partially arranged between the second abutting portions (23) and the first housing wall (11). The elastic modulus of the first insulating pieces (31) is less than or equal to the elastic modulus of the second insulating pieces (32).

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 202420031881.2 and application date 2024-01-05, 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 first shell wall, a pole and a sealed insulating assembly, the first shell wall having a mounting hole, the pole comprising a penetration portion passing through the mounting hole, and a first abutting portion and a second abutting portion connected to the penetration portion and abutting against both sides of the first shell wall, the first abutting portion abutting against the first shell wall by riveting, the sealed insulating assembly is insulated and fitted between the pole and the first shell wall, and comprises a first insulating member at least partially disposed between the first abutting portion and the first shell wall, and a second insulating member at least partially disposed between the second abutting portion and the first shell wall, the elastic modulus of the first insulating member is less than or equal to the elastic modulus of the second insulating member, and the first insulating member is elastically compressed between the first abutting portion and the first shell wall to seal the first abutting portion and the first shell wall.

[0008] In the above technical solution, when the pole is riveted to the first shell wall, the deformed first abutment portion will apply a force to the first insulating member. Since the elastic modulus of the first insulating member is less than or equal to the elastic modulus of the second insulating member, the deformation ability of the first insulating member is relatively strong relative to the second insulating member, or the stiffness is relatively small. Therefore, the first insulating member can absorb the force applied by the riveted deformed first abutment portion by deformation, thereby reducing the risk of cracking of the first insulating member, which is beneficial to improving the reliability of the seal between the first shell wall and the pole, and improving the reliability of the battery cell.

[0009] In some embodiments, the first insulating member includes a first main body portion and a first extension portion, the first main body portion is located on the side of the first abutting portion facing the first shell wall, the first extension portion is connected to the first main body portion, and protrudes relative to the first main body portion in a direction away from the first shell wall, and stops on the side of the first abutting portion away from the center axis of the mounting hole.

[0010] In the above technical solution, when metal wires are formed during the riveting process, if they overflow from the edge of the first abutting portion and contact the first shell wall, a short circuit problem is likely to occur. By providing a first extension portion on the overflow path for blocking, the risk of short circuit caused by metal wire overflow can be reduced, thereby further improving the reliability of the battery cell.

[0011] In some embodiments, the first insulating member includes a first main body portion and a second extending portion, the first main body portion is located on a side of the first abutting portion facing the first shell wall, and the second extending portion is connected to the first main body portion and extends into the mounting hole.

[0012] In the above technical solution, because the first insulating member includes a second extension extending into the mounting hole, the second extension can be used to insulate and isolate the penetration portion from the wall of the mounting hole, further reducing the risk of short circuits between the pole and the housing. Furthermore, the difficulty of insulating the penetration portion from the housing is reduced, and the number of insulating members required is reduced. Furthermore, because the first insulating member includes a second extension extending into the mounting hole, the second extension can be used to position the first insulating member when it is assembled to the first housing wall, improving the assembly efficiency and stability of the first insulating member and facilitating the assembly of the pole.

[0013] In some embodiments, a first corner disposed toward the first shell wall is formed at a connection between the second extension portion and the first main body portion, and the first corner is formed as a chamfer.

[0014] In the above technical solution, when the pole is assembled to the first shell wall, the second corner easily squeezes the first corner, causing the first insulating member to crack from the position of the first corner. By setting the first corner as a chamfer, when the second corner applies force to the first corner, the force area of ​​the first corner can be increased, so that the force at the position of the first corner is dispersed, thereby reducing the risk of the first insulating member cracking from the position of the first corner.

[0015] In some embodiments, a first corner disposed toward the first shell wall is formed at a connection between the second extension portion and the first body portion, and the first shell wall includes a second corner disposed corresponding to the first corner, and the second corner is formed as a chamfer.

[0016] In the above technical solution, when the pole is assembled to the first shell wall, the second corner is likely to squeeze the first corner, causing the first insulating member to crack from the position of the first corner. By setting the second corner to be chamfered, the area of ​​the second corner applying force to the first corner can be increased, so that the force application position is dispersed, thereby reducing the force concentration squeezing the position of the first corner, thereby reducing the risk of the first insulating member cracking from the position of the first corner.

[0017] In some embodiments, the second insulating member includes: a second body portion and a third extension portion, the second body portion is located on a side of the second abutting portion facing the first shell wall, and the third extension portion is connected to the second body portion and extends into the mounting hole.

[0018] In the above technical solution, because the second insulating member includes a third extension extending into the mounting hole, the third extension can be used to insulate and isolate the penetration portion from the wall of the mounting hole, further reducing the risk of short circuits between the pole and the housing. Furthermore, the difficulty of insulating the penetration portion from the housing is reduced, and the number of insulating members required is reduced. Furthermore, because the second insulating member includes a third extension extending into the mounting hole, the third extension can be used to position the second insulating member when it is assembled onto the first housing wall, improving the assembly efficiency and stability of the second insulating member and facilitating the assembly of the pole.

[0019] In some embodiments, the second abutment portion is arranged on the inner side of the first shell wall, and the second insulating member includes: a second main body portion and a fourth extension portion, the second main body portion is located on the side of the second abutment portion facing the first shell wall; the fourth extension portion is connected to the side of the second main body portion away from the pole, and is spaced between the first shell wall and the active material coating portion located on the inner side of the first shell wall.

[0020] In the above technical solution, the second insulating member has a larger scope, which can not only play the role of insulation between the second abutting portion and the first shell, but also play the role of insulation between the first shell wall and the active material coating portion, thereby simplifying the structure of the battery cell, reducing production costs and improving production efficiency.

[0021] In some embodiments, the second insulating member is elastically compressed between the second abutting portion and the first shell wall to seal the second abutting portion and the first shell wall.

[0022] In the above technical solution, the second insulating member also has the ability of elastic deformation, and can achieve sealing between the second abutting portion and the first shell wall through elastic compression. In this way, not only the sealing between the first abutting portion and the first shell wall is achieved by the elastic compression of the first insulating member, but also the sealing between the second abutting portion and the first shell wall is achieved by the elastic compression of the second insulating member, thereby further improving the sealing effect of the sealed insulating assembly between the first shell wall and the pole.

[0023] In some embodiments, the elastic modulus of the first insulating member is less than or equal to 6 MPa, and the compression amount of the first insulating member is 10% to 50%.

[0024] In the above technical solution, by setting the elastic modulus of the first insulating member to be less than or equal to 6 MPa and the compression amount of the first insulating member to be 10% to 50%, the cracking problem of the first insulating member can be more effectively avoided.

[0025] In some embodiments, the compression amount of the first insulating member is 32% to 38%.

[0026] In the above technical solution, by setting the elastic modulus of the first insulating member to be less than or equal to 6 MPa and the compression amount of the first insulating member to be 32% to 38%, not only the requirement of no cracking can be met, but also a better sealing effect can be achieved.

[0027] In some embodiments, the material of the first insulating member includes one of fluororubber, perfluoroalkyl compound, polypropylene, and EPDM rubber.

[0028] In the above technical solution, the material of the first insulating member is simple and common, and can be easily mass-produced.

[0029] In some embodiments, in the radial direction of the mounting hole, an extension dimension of the second abutting portion is greater than or equal to an extension dimension of the first abutting portion.

[0030] In the above technical solution, when the pole is riveted to the first shell wall and the first abutting portion is processed by the riveting process, since the radial extension dimension of the second abutting portion is greater than or equal to the radial extension dimension of the first abutting portion, the second abutting portion can reliably abut against the first shell wall and is not easily dislodged from the mounting hole, so that the riveting can be carried out smoothly, and the first abutting portion can be riveted in place, thereby improving the matching stability of the pole with the first shell after riveting.

[0031] In some embodiments, the first abutting portion abuts against the outer side of the first shell wall, and the second abutting portion abuts against the inner side of the first shell wall.

[0032] In the above technical solution, since the first abutting portion abuts against the outer side of the first shell wall, the first insulating member can be installed from the outer side of the first shell wall, and at least a portion of it can be exposed from the outer side of the first shell wall. It is possible to directly observe from the outer side of the first shell wall whether the first insulating member is installed, thereby eliminating the need for a gas leakage check process to detect whether the first insulating member is missing, which is beneficial to improving the production efficiency of battery cells.

[0033] In some embodiments, the battery cell has a receiving cavity formed on the inner side of the first shell wall, and a receiving groove open in a direction away from the receiving cavity is formed on the pole. The pole has a connecting hole, which passes through the groove wall on one side of the receiving groove close to the receiving cavity and connects the receiving cavities.

[0034] 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, wherein the receiving tank can play the role of buffering the electrolyte to improve the problems of electrolyte splashing, overflowing, etc. Moreover, the side wall of the receiving tank (i.e., the tank wall extending from the notch of the receiving tank toward the receiving cavity) 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, there is no need to perform special processing on the shell, which is conducive to reducing the structural complexity and processing difficulty of the shell.

[0035] 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 the connecting hole to be at least partially received in the receiving groove.

[0036] 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.

[0037] In some embodiments, the battery cell includes a cover plate covering the receiving groove, a liquid injection hole that can communicate with the receiving groove is formed on the cover plate, and the battery cell also includes a sealing structure for sealing the liquid injection hole.

[0038] In the above technical solution, by processing the injection hole on the cover plate, 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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

[0043] 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.

[0044] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0045] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0046] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0047] FIG4 is an exploded view of the structure of the battery cell shown in FIG3 ;

[0048] FIG5 is a schematic orthographic projection diagram of a battery cell provided in some embodiments of the present application;

[0049] FIG6 is a cross-sectional view along line AA in FIG5;

[0050] FIG7 is a partial enlarged view of the circled portion B in FIG6 ;

[0051] FIG8 is a partial enlarged view of the circled portion C in FIG7 ;

[0052] FIG9 is a schematic diagram of the pole and the sealed insulation assembly shown in FIG4 ;

[0053] FIG10 is a partial cross-sectional view of a battery cell according to some embodiments of the present application;

[0054] FIG11 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0055] FIG12 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application.

[0056] 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; accommodating chamber 10; first housing wall 11; second corner 111; mounting hole 12; central axis L; second housing wall 13; pole 2; penetration portion 21; first abutting portion 22; second abutting portion 23; accommodating groove 24; Communication hole 25; support portion 26; sealed insulating assembly 3; first insulating member 31; first body portion 311; first extension portion 312; second extension portion 313; first corner 314; second insulating member 32; second body portion 321; third extension portion 322; fourth extension portion 323; insulating bracket 33; battery cell assembly 4; active material coating portion 41; conductive portion 42; cover plate 5; injection hole 51; sealing structure 6; first sealing member 61; second sealing member 62; DETAILED DESCRIPTION

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] The term "plurality" used in this application refers to two or more (including two).

[0064] 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.

[0065] 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 prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] The material of the isolation film is not limited, and can be, for example, polypropylene or polyethylene.

[0071] In some battery cells in the related art, the poles are installed on the shell by riveting. In order to achieve insulation sealing between the shell and the poles, insulating plastic is usually provided between the poles and the shell before riveting the poles. However, when the poles are riveted, the poles will be deformed by force and squeeze the insulating plastic. The weak parts of the insulating plastic are easily cracked by force. Once the insulating plastic cracks, it will affect the reliability of the insulation seal between the shell and the poles, resulting in a decrease in the reliability of the battery cell.

[0072] To this end, an embodiment of the present application proposes a battery cell, comprising: a shell, a pole and a sealed insulating assembly, the shell comprising a first shell wall having a mounting hole, the pole comprising a penetration portion passing through the mounting hole, and a first abutting portion and a second abutting portion connected to the penetration portion and abutting against both sides of the first shell wall, the first abutting portion abutting against the first shell wall by riveting, the sealed insulating assembly, insulated and fitted between the pole and the first shell wall, and comprising a first insulating member at least partially disposed between the first abutting portion and the first shell wall, and a second insulating member at least partially disposed between the second abutting portion and the first shell wall, the elastic modulus of the first insulating member being less than or equal to the elastic modulus of the second insulating member, the first insulating member being elastically compressed between the first abutting portion and the first shell wall to seal between the first abutting portion and the first shell wall.

[0073] Therefore, when the pole is riveted to the first shell wall, since the first abutting portion is formed by riveting, during the riveting process, the deformed first abutting portion will apply a force to the first insulating member, making the first insulating member easy to crack. By setting the elastic modulus of the first insulating member to be less than or equal to the elastic film of the second insulating member, the deformation ability of the first insulating member relative to the second insulating member is relatively strong, or the stiffness is relatively small. Therefore, the first insulating member can absorb the force applied by the riveted deformed first abutting portion through deformation, thereby reducing the risk of cracking of the first insulating member, which is beneficial to improving the reliability of the insulating seal between the first shell wall and the pole, and improving the reliability of the battery cell.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] FIG8 is a partial enlarged view of the circled portion C in FIG7 , and FIG9 is a schematic diagram of the pole 2 and the sealed insulating assembly 3 shown in FIG4 . In conjunction with FIG4 , FIG8 and FIG9 , the housing 1 includes a first housing wall 11 , which has 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 , that is, 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 , and the projection of the penetration portion 21 on the projection surface falls within the projection range of the mounting hole 12 on the projection surface , 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. This allows the penetration portion 21 to be passed through the mounting hole 12 .

[0083] Referring again to Figures 8 and 9 , the pole 2 further includes a first abutting portion 22 and a second abutting portion 23 connected to the penetration portion 21 and abutting against both sides of the first shell wall 11. Specifically, the first abutting portion 22 and the second abutting portion 23 are both connected to the penetration portion 21, and the first abutting portion 22 and the second abutting portion 23 respectively abut against 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 being the side surface of the first shell wall 11 facing the accommodating cavity 10, the outer surface being 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 being the outer side of the outer surface, and the side of the inner surface facing the accommodating cavity 10 being the inner side of the inner surface. The first abutment 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, and the second abutment 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 abutment portion 22 extends to the outside of the outer surface of the first shell wall 11, and the second abutment portion 23 extends to the inside of the inner surface of the first shell wall 11, or the first abutment portion 22 extends to the inside of the inner surface of the first shell wall 11, and the second abutment portion 23 extends to the outside of the outer surface of the first shell wall 11.

[0084] Since the first abutting portion 22 and the second abutting portion 23 respectively abut against 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 abutting portion 22 directly faces the first housing wall 11 to prevent the pole 2 from moving relative to the first housing wall 11 toward the second abutting portion 23, and at least a portion of the second abutting portion 23 directly faces the first housing wall 11 to prevent the pole 2 from moving relative to the first housing wall 11 toward the first abutting 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 abutting 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 abutting portion 22 corresponding to the intersection area is opposite to the first shell wall 11, and the projection of the second abutting 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 abutting portion 23 corresponding to the intersection area is opposite to the first shell wall 11.

[0085] In the embodiment of the present application, the first abutting portion 22 abuts the wall of the first shell 11 by riveting. For example, the morphology of the penetration portion 21 and the second abutting portion 23 of the pole 2 remains consistent before and after assembly with the first shell wall 11, but the morphology of the first abutting portion 22 changes before and after assembly. After the pole 2 is assembled to the mounting hole 12 through the penetration portion 21, the second abutting portion 23 abuts the first shell wall 11. The first abutting portion 22 is produced using a flanging riveting process to achieve abutment between the first abutting portion 22 and the first shell wall 11. This facilitates assembly of the pole 2 and the first shell wall 11, and ensures reliable abutment.

[0086] Referring again to Figures 7-9, the battery cell 102 further includes a sealing insulating assembly 3, which is insulated and fitted between the electrode 2 and the first shell wall 11. That is, at least a portion of the sealing insulating assembly 3 is sandwiched between the first shell wall 11 and the electrode 2, so that the electrode 2 and the first shell wall 11 are indirectly fitted together through the sealing insulating assembly 3, thereby achieving insulation and sealing between the first shell wall 11 and the electrode 2. The sealing insulating assembly 3 includes a first insulating member 31 and a second insulating member 32. At least a portion of the first insulating member 31 is disposed between the first abutting portion 22 and the first shell wall 11 to achieve insulation between the first abutting portion 22 and the first shell wall 11. At least a portion of the second insulating member 32 is disposed between the second abutting portion 23 and the first shell wall 11 to achieve insulation between the second abutting portion 23 and the first shell wall 11.

[0087] In the embodiment of the present application, the elastic modulus of the first insulating member 31 is less than or equal to the elastic modulus of the second insulating member 32. The first insulating member 31 is elastically compressed between the first abutting portion 22 and the first housing wall 11, thereby achieving a seal between the first abutting portion 22 and the first housing wall 11. It will be understood that, because the first abutting portion 22 and the first housing wall 11 are sealed, the requirement that the pole 2 and the first housing wall 11 be sealed by the sealing insulating assembly 3 can be met regardless of whether the second abutting portion 23 and the first housing wall 11 are sealed.

[0088] It can be understood that the first insulating member 31 can be made of a material that is resistant to electrolyte. When the first insulating member 31 is elastically compressed between the first abutting portion 22 and the first shell wall 11 to seal the first abutting portion 22 and the first shell wall 11, a sealing surface is formed, thereby effectively improving the problem of electrolyte leakage from the connection in the shell 1.

[0089] In an embodiment of the present application, when the pole 2 is riveted to the first shell wall 11, the deformed first abutment portion 22 will apply a force to the first insulating member 31. Since the elastic modulus of the first insulating member 31 is less than or equal to the elastic modulus of the second insulating member 32, the deformation ability of the first insulating member 31 is relatively strong relative to the second insulating member 32, or the stiffness is relatively small. Therefore, the first insulating member 31 can absorb the force applied by the riveted deformed first abutment portion 22 by deformation, thereby reducing the risk of cracking of the first insulating member 31, which is beneficial to improving the reliability of the seal between the first shell wall 11 and the pole 2, and improving the reliability of the battery cell 102.

[0090] In addition, when the elastic modulus of the second insulating member 32 is greater than the elastic membrane of the second insulating member 32, the second insulating member 32 has a greater rigidity relative to the first insulating member 31, and can play a supporting role to a certain extent, so that the overall compression amount of the sealed insulating assembly 3 is easy to control. On the premise of ensuring the sealing requirements between the pole 2 and the first shell wall 11, the difficulty of processing and production can be reduced and the production efficiency can be improved.

[0091] In some embodiments of the present application, please refer to Figures 7 and 8 again. The first insulating member 31 includes a first main body portion 311 and a first extension portion 312. The first main body portion 311 is located on the side of the first abutting portion 22 facing the first shell wall 11. The first extension portion 312 is connected to the first main body portion 311, and the first extension portion 312 protrudes relative to the first main body portion 311 in a direction away from the first shell wall 11, and stops on the side of the first abutting portion 22 away from the center axis L of the mounting hole 12.

[0092] In the above technical solution, when metal wires are formed during the riveting process, if they overflow from the edge of the first abutting portion 22 and contact the first shell wall 11, a short circuit problem is likely to occur. By providing a first extension portion 312 on the overflow path to block it, the risk of short circuit caused by metal wire overflow can be reduced, thereby further improving the reliability of the battery cell 102.

[0093] In some embodiments of the present application, please refer to Figures 7 and 8 again. The first insulating member 31 includes a first main body portion 311 and a second extension portion 313. The first main body portion 311 is located on the side of the first abutting portion 22 facing the first shell wall 11. The second extension portion 313 is connected to the first main body portion 311, and the second extension portion 313 extends into the mounting hole 12.

[0094] In the above technical solution, because the first insulating member 31 includes a second extension 313 extending into the mounting hole 12, the second extension 313 can be used to insulate and block the penetration portion 21 from the wall of the mounting hole 12, further reducing the risk of short circuits between the pole 2 and the housing 1. Furthermore, the difficulty of insulating the penetration portion 21 from the housing 1 is reduced, and the number of insulating members required is reduced. Furthermore, because the first insulating member 31 includes the second extension 313 extending into the mounting hole 12, the second extension 313 can be used to position the first insulating member 31 when it is assembled to the first housing wall 11, thereby improving the assembly efficiency and stability of the first insulating member 31 and facilitating the assembly of the pole 2.

[0095] For example, during the production process, the first insulating member 31 and the second insulating member 32 can be respectively installed to the first shell wall 11, and then the pole 2 can be inserted into the mounting hole 12, and then the pole 2 can be riveted. Since the first insulating member 31 and the first shell wall 11 cooperate with the mounting hole 12 through the second extension portion 313, the stability of the relative position of the first insulating member 31 and the first shell wall 11 can be improved. In this way, when the pole 2 is subsequently inserted into the mounting hole 12, the probability of the first insulating member 31 leaving the installation position can be reduced, thereby improving the success rate of assembly.

[0096] In some embodiments of the present application, please refer to Figure 8 again. A first corner 314 is formed at the connection between the second extension portion 313 and the first main body portion 311, which is set toward the first shell wall 11. The first shell wall 11 includes a second corner 111 set corresponding to the first corner 314. The first corner 314 is formed as a chamfer, wherein the chamfer can be a rounded corner or a chamfered corner.

[0097] In the above technical solution, when the pole 2 is assembled to the first shell wall 11, the second corner 111 easily squeezes the first corner 314, causing the first insulating member 31 to crack at the position of the first corner 314. By setting the first corner 314 to be chamfered, when the second corner 111 applies force to the first corner 314, the force-bearing area of ​​the first corner 314 can be increased, so that the force at the position of the first corner 314 is dispersed, thereby reducing the risk of the first insulating member 31 cracking at the position of the first corner 314.

[0098] In some embodiments of the present application, please refer to Figure 8 again. A first corner 314 is formed at the connection between the second extension portion 313 and the first main body portion 311, which is set toward the first shell wall 11. The first shell wall 11 includes a second corner 111 set corresponding to the first corner 314. The second corner 111 is formed as a chamfer, wherein the chamfer can be a rounded corner or a chamfered corner.

[0099] In the above technical solution, when the pole 2 is assembled to the first shell wall 11, the second corner 111 easily squeezes the first corner 314, causing the first insulating member 31 to crack from the position of the first corner 314. By setting the second corner 111 to be chamfered, the area where the second corner 111 applies force to the first corner 314 can be increased, so that the force application position is dispersed, thereby reducing the force concentration squeezing the position of the first corner 314, thereby reducing the risk of the first insulating member 31 cracking from the position of the first corner 314.

[0100] In some embodiments of the present application, please refer to Figure 8 again. A first corner 314 is formed at the connection between the second extension portion 313 and the first main body portion 311, and is set toward the first shell wall 11. The first shell wall 11 includes a second corner 111 set corresponding to the first corner 314. The first corner 314 is formed as a chamfered corner or a chamfered corner, and the second corner 111 is formed as a chamfered corner or a chamfered corner.

[0101] In the above technical solution, when the pole 2 is assembled to the first shell wall 11, the second corner 111 easily squeezes the first corner 314, causing the first insulating member 31 to crack from the position of the first corner 314. By setting both the first corner 314 and the second corner 111 to be chamfered, the area where the second corner 111 applies force to the first corner 314 can be increased, so that the force application position is dispersed, thereby reducing the force concentration on the position of squeezing the first corner 314. When the second corner 111 applies force to the first corner 314, the force area of ​​the first corner 314 can be increased, so that the force at the position of the first corner 314 is dispersed, thereby reducing the risk of the first insulating member 31 cracking from the position of the first corner 314 from two aspects.

[0102] In some embodiments of the present application, please refer to Figure 8 again. Regardless of whether at least one of the second corner 111 and the first corner 314 is processed into a chamfered form, the second corner 111 and the first corner 314 can be set to have a fitting gap. In this way, the extrusion of the second corner 111 on the first corner 314 can be reduced to a certain extent, thereby reducing the risk of the first insulating member 31 cracking from the position of the first corner 314.

[0103] In some embodiments of the present application, please refer to Figure 8 again. The second insulating member 32 includes: a second main body portion 321 and a third extension portion 322. The second main body portion 321 is located on the side of the second abutting portion 23 facing the first shell wall 11, and the third extension portion 322 is connected to the second main body portion 321 and extends into the mounting hole 12.

[0104] In the above technical solution, because the second insulating member 32 includes a third extension 322 extending into the mounting hole 12, the third extension 322 can be used to insulate and isolate the penetration portion 21 from the wall of the mounting hole 12, further reducing the risk of short circuits between the pole 2 and the housing 1. Furthermore, the difficulty of insulating the penetration portion 21 from the housing 1 is reduced, and the number of insulating members required is reduced. Furthermore, because the second insulating member 32 includes the third extension 322 extending into the mounting hole 12, the third extension 322 can be used to position the second insulating member 32 when it is assembled onto the first housing wall 11, thereby improving the assembly efficiency and stability of the second insulating member 32 and facilitating assembly of the pole 2.

[0105] For example, during the production process, the first insulating member 31 and the second insulating member 32 can be respectively installed to the first shell wall 11, and then the pole 2 can be inserted into the mounting hole 12, and then the pole 2 can be riveted. Since the second insulating member 32 cooperates with the first shell wall 11 and the mounting hole 12 through the third extension portion 322, the stability of the relative position of the second insulating member 32 and the first shell wall 11 can be improved. In this way, when the pole 2 is subsequently inserted into the mounting hole 12, the probability of the second insulating member 32 leaving the installation position can be reduced, thereby improving the success rate of assembly.

[0106] Figure 10 is a partial cross-sectional view of a battery cell 102 in some embodiments of the present application. In some embodiments of the present application, please refer to Figure 10. The second abutting portion 23 is arranged on the inner side of the first shell wall 11, and the second insulating member 32 includes: a second main body portion 321 and a fourth extension portion 323. The second main body portion 321 is located on the side of the second abutting portion 23 facing the first shell wall 11, and the fourth extension portion 323 is connected to the side of the second main body portion 321 away from the pole 2, and is spaced between the first shell wall 11 and the active material coating portion 41 located on the inner side of the first shell wall 11.

[0107] In the above technical solution, the second insulating member 32 has a larger range, which can not only play the role of insulation between the second abutting portion 23 and the first shell 1, but also play the role of insulation between the first shell wall 11 and the active material coating portion 41, thereby simplifying the structure of the battery cell 102, reducing production costs and improving production efficiency.

[0108] In related art, an insulating bracket is required between the active material coating and the first shell wall. In the above-described technical solution, the second insulating member and the insulating bracket are integrated into one piece, thereby saving parts, improving assembly efficiency, and reducing production costs. Furthermore, the radial extension dimension W2 of the second abutting portion 23 in the mounting hole 12 can be reduced, thereby lowering the cost of the terminal 2, reducing the surface area of ​​the terminal 2, and improving the compressive strength of the terminal 2.

[0109] Of course, the present application is not limited to this. For example, in other embodiments of the present application, please refer to Figure 8 again, the second insulating member 32 may also not include the fourth extension portion 323. In this case, the insulating bracket 33 separately provided from the second insulating member 32 can play an insulating role between the first shell wall 11 and the active material coating portion 41.

[0110] In some embodiments of the present application, the second insulating member 32 is elastically compressed between the second abutting portion 23 and the first shell wall 11 to seal the second abutting portion 23 and the first shell wall 11 .

[0111] In the above technical solution, the second insulating member 32 also has the ability of elastic deformation, and can achieve sealing between the second abutting portion 23 and the first shell wall 11 through elastic compression. In this way, not only is the sealing between the first abutting portion 22 and the first shell wall 11 achieved by the elastic compression of the first insulating member 31, but the sealing between the second abutting portion 23 and the first shell wall 11 is also achieved by the elastic compression of the second insulating member 32, thereby further improving the sealing effect of the sealed insulating assembly 3 between the first shell wall 11 and the pole 2.

[0112] It is worth noting that, regardless of whether the second insulating member 32 includes the fourth extending portion 323 , the second insulating member 32 can be configured to have elastic deformation capability and be elastically compressed between the second abutting portion 23 and the first shell wall 11 .

[0113] In some embodiments of the present application, when the second insulating member 32 is elastically compressed between the second abutting portion 23 and the first shell wall 11 to seal the second abutting portion 23 and the first shell wall 11, if the elastic modulus of the second insulating member 32 is equal to the elastic modulus of the first insulating member 31, the second insulating member 32 and the first insulating member 31 can be made of the same material, thereby reducing production difficulties. If the elastic modulus of the second insulating member 32 is greater than the elastic modulus of the first insulating member 31, the cracking problem of the first insulating member 31 can be effectively alleviated, and the difficulty of controlling the compression of the sealed insulating assembly 3 can be reduced.

[0114] In some embodiments of the present application, the elastic modulus of the first insulating member 31 is less than or equal to 6 MPa, and the compression of the first insulating member 31 is 10% to 50%. For example, the elastic modulus of the first insulating member 31 is 4 MPa, 5 MPa, 6 MPa, etc., and the compression of the first insulating member 31 is 10%, 20%, 30%, 40%, 50%, etc. Experimental verification shows that by setting the elastic modulus of the first insulating member 31 to be less than or equal to 6 MPa and the compression of the first insulating member 31 to be 10% to 50%, cracking will not occur when riveting the pole 2. However, when the elastic modulus of the first insulating member 31 is set to greater than 6 MPa and the compression of the first insulating member 31 is less than 10%, the first insulating member 31 is prone to cracking when riveting the pole 2.

[0115] For example, when the elastic modulus of the first insulating part 31 is less than or equal to 6 MPa, the compression amount of the first insulating part 31 can also be set to 32% to 38%, such as 32%, 35%, 38%, etc., so as to not only meet the requirement of no cracking, but also achieve a better sealing effect.

[0116] It's worth noting that for a material, the elastic modulus refers to the ratio between the deformation and stress produced when a force is applied to the material, describing the degree of elastic deformation of the material. For example, for rubber materials, the elastic modulus indicates the degree of deformation of the material when subjected to force. The smaller the elastic modulus, the greater the material's elasticity and deformation capacity. Conversely, the larger the elastic modulus, the smaller the deformation capacity. Rubber materials deform to a certain extent when subjected to force. Compression refers to the amount of deformation that occurs when the material is under pressure. Due to the unique structure and properties of rubber materials, the compression amount varies widely. Generally speaking, the larger the elastic modulus, the smaller the compression amount. Therefore, in the production and application of rubber products, the elastic modulus and compression amount of the rubber material can be controlled to achieve the required performance according to different needs.

[0117] In some embodiments of the present application, the material of the first insulating part 31 is not limited. For example, soft rubber can be used. The material of soft rubber is relatively soft, which is conducive to improving the cracking problem during the riveting process. For example, the material of the first insulating part 31 may include one of fluororubber, perfluoroalkyl compound, polypropylene (PP), and ethylene propylene diene monomer (EPDM). As a result, the material of the first insulating part is simple, common, and easy to mass-produce. In the related art, PPS (polyphenylene sulfide, a new type of high-performance thermoplastic resin) is often used in the position of the first insulating part. Its elastic modulus is about 20Gpa, and its stiffness is much greater than the stiffness of the first insulating part 31 in this embodiment whose elastic modulus is less than or equal to 6mpa, and there is a risk of cracking.

[0118] For example, the first insulating member 31 is made of FKM (fluororubber) or PFA (perfluoroalkyl compound). These two materials are not only resistant to electrolyte, but also have a corresponding compression capacity of 10% to 50%, and an elastic modulus of about 6 MPa. Experimental verification shows that no cracking problem occurs when riveting the pole 2.

[0119] It is understood that the riveting stroke of the first abutting portion 22 of the terminal 2 can be controlled to ensure that the compression of the first insulating member 31 meets the requirements, thereby satisfying the need for reliable sealing. It is understood that the wall thickness of the first body portion 311 of the first insulating member 31 is X, and after riveting, the thickness becomes Y. In this case, the compression is (XY) / Y. For example, if X is 1.1 mm and Y is 0.7 mm, the compression is (1.1-0.7) / 1.1≈36%.

[0120] Furthermore, when the elastic modulus of the second insulating member 32 is consistent with that of the first insulating member 31, the two may be made of the same material or different materials. When the elastic modulus of the second insulating member 32 is greater than that of the first insulating member 31, the second insulating member 32 may be made of PPS (polyphenylene sulfide, a new high-performance thermoplastic resin) or LCP (liquid crystal polymer), etc., thereby providing the second insulating member 32 with greater rigidity and providing support, thereby better controlling the compression of the sealed insulating assembly 3 and improving the sealing performance.

[0121] In some embodiments of the present application, referring to Figure 8, in the radial direction of the mounting hole 12, the line connecting the center of the mounting hole 12 and any point on the edge of the mounting hole 12 is radial, and the extension dimension W2 of the second abutting portion 23 is greater than or equal to the extension dimension W1 of the first abutting portion 22, that is, W2≥W1.

[0122] In the above technical solution, when the first abutting portion 22 is processed by the riveting process, since the extension dimension W2 of the second abutting portion 23 is greater than or equal to the extension dimension W1 of the first abutting portion 22, the second abutting portion 23 can reliably abut against the first shell wall 11 and is not easy to fall out of the mounting hole 12, thereby facilitating smooth riveting, so that the first abutting portion 22 can be riveted in place, thereby improving the matching stability of the pole 2 with the first shell 1 after riveting.

[0123] In some embodiments of the present application, referring to FIG8 , the first abutting portion 22 abuts against the outer side of the first shell wall 11, and the second abutting portion 23 abuts against the inner side of the first shell wall 11. The "inner side" refers to the side of the first shell wall 11 facing the accommodating cavity 10, and the opposite side is the "outer side," i.e., the side away from the accommodating cavity 10.

[0124] In the above technical solution, since the first abutting portion 22 abuts against the outer side of the first shell wall 11, the first insulating member 31 can be installed from the outer side of the first shell wall 11, and at least a portion of it can be exposed from the outer side of the first shell wall 11. It is possible to directly observe from the outer side of the first shell wall 11 whether the first insulating member 31 is installed, thereby eliminating the need for a gas leakage inspection process to detect whether the first insulating member 31 is missing, which is beneficial to improving the production efficiency of the battery cell 102.

[0125] In some embodiments of the present application, as shown in FIG11 , a battery cell 102 has a receiving cavity 10 formed on the inner side of the first shell wall 11, and a receiving groove 24 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 25, which passes through the groove wall of the receiving groove 24 on the side adjacent to the receiving cavity 10 and connects the receiving cavity 10 with the receiving groove 24. For example, when the penetration portion 21 is annular, the receiving groove 24 is located in the inner ring region of the penetration portion 21. For example, the receiving groove 24 can be jointly defined by the penetration portion 21 and the support portion 26 located in the inner ring region of the penetration portion 21.

[0126] Thus, when the electrolyte is injected into the battery cell 102, the electrolyte can be injected into the receiving groove 24 and then flow toward the receiving cavity 10 through the connecting hole 25, wherein the receiving groove 24 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 24 (that is, the groove wall extending from the notch of the receiving groove 24 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.

[0127] In some embodiments of the present application, as shown in Figure 11, 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 25 to be at least partially received in the accommodating groove 24.

[0128] It is worth noting that there may be one or more communicating holes 25, and the conductive portion 42 may be provided through at least one of the communicating holes 25. For example, at least one communicating hole 25 is capable of passing electrolyte. For example, at least one communicating hole 25 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 25 is capable of still allowing electrolyte to pass through after the conductive portion 42 is provided.

[0129] Therefore, by accommodating at least a portion of the conductive part 42 in the receiving groove 24, at least a portion of the conductive part 42 occupies the space in the receiving groove 24, 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.

[0130] 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 FIG11 , the conductive portion 42 is welded to the side wall of the accommodating groove 24 close to the accommodating cavity 10, thereby improving the compactness of the fit and facilitating the welding operation between the two. Of course, the present application is not limited to this. In other embodiments, the conductive portion 42 can also be set to be welded to the cover plate 5 to form an electrical connection, which is not limited here.

[0131] In some embodiments, as shown in FIG12 , the battery cell 102 includes a cover plate 5 that covers the receiving tank 24 . The cover plate 5 is formed with an injection hole 51 that communicates with the receiving tank 24 . 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 . At this time, the electrolyte can be injected into the receiving tank 24 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 the electrolyte from overflowing and to prevent foreign matter from entering the receiving cavity 10 through the injection hole 51 , thereby improving the reliability of the battery cell 102 .

[0132] Therefore, by processing the injection hole 51 on the cover plate 5, the opening is relatively small and located outside, and the injection inlet can be more easily and reliably sealed 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.

[0133] In some embodiments, as shown in FIG12 , the cover plate 5 does not have a portion that stops on 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 on the cover plate 5 from the outside of the cover plate 5 (i.e., the side away from the accommodating cavity 10 ). In this way, by setting the sealing structure 6 to be installed on the cover plate 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 cover plate 5, thereby ensuring the reliability of the connection between the cover plate 5 and the pole 2.

[0134] 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 cover plate 5 by means of threads or screws, thereby facilitating disassembly and assembly.

[0135] For example, when the sealing structure 6 is in a non-detachable fixed form, the sealing structure 6 can be fixed to the cover plate 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 is interference-fitted with the liquid injection hole 51, and a second sealing member 62 that covers the first sealing member 61 and is welded to the cover plate 5. Alternatively, in some embodiments, the second sealing member 62 can be configured to be detachably connected to the cover plate 5 by means of a screw-on fastener, so as to restrict the first sealing member 61 to a position that is interference-fitted with the liquid injection hole 51.

[0136] In some embodiments of the present application, as shown in FIG12 , at least a portion of the sealing structure 6 is embedded in the liquid injection hole 51. That is, the sealing structure 6 may be entirely embedded in the liquid injection hole 51, or only a portion of the sealing structure 6 may 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, reducing the space occupied by the sealing structure 6 outside the cover plate 5, thereby reducing the interference with the flow collection component, increasing the connection area between the flow collection component and the cover plate 5, and improving the flow efficiency.

[0137] In some embodiments of the present application, the first shell wall 11 is an integrally formed cover plate 5, or the housing 1 further includes a second shell wall 13, the first shell wall 11 and at least one second shell wall 13 are integrally formed, and the second shell wall 13 extends toward one side in the thickness direction of the first shell wall 11. In this way, the structural position of the terminal 2 can be flexibly designed, thereby increasing the applicability of the battery cell 102 of the embodiments of the present application.

[0138] It is worth noting that the second shell wall 13 can extend from an edge of the first shell wall 11. When the first shell wall 11 is rectangular, at least one of the four edges of the first shell wall 11 can extend into the second shell wall 13. For example, only one edge of the first shell wall 11 can extend into the second shell wall 13. Alternatively, only two edges of the first shell wall 11 can each extend into the second shell wall 13. Alternatively, three edges of the first shell wall 11 can each extend into the second shell wall 13. Alternatively, all four edges of the first shell wall 11 can extend into the second shell wall 13. For example, when the housing 1 is a rectangular shell, any wall surface of the rectangular shell can serve as the first shell wall 11.

[0139] For example, the shell 1 may include a shell body and a cover plate 5, the shell body defines a space with one side open, and the cover plate 5 is arranged on the open side of the shell body to form a accommodating cavity 10 between the shell body and the cover plate 5. At this time, the side surface of the shell body opposite to the cover plate 5 is the first shell wall 11, and the wall surface of the shell body connected between the first shell wall 11 and the cover plate 5 is the second shell wall 13, or, the side surface of the shell body opposite to the cover plate 5 is the second shell wall 13, and the wall surface of the shell body connected between the second shell wall 13 and the cover plate 5 is the first shell wall 11, or, the cover plate 5 is the first shell wall 11, either way.

[0140] 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.

[0141] For example, the battery 100 may further include a busbar component, and at least two of the battery cells 102 are 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 cover 5 of one battery cell 102 is connected to the cathode cover 5 of the next battery cell 102 via one busbar component, while the cathode cover 5 of the battery cell 102 is connected to the anode cover 5 of the previous battery cell 102 via another busbar component.

[0142] 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.

[0143] Next, a battery cell 102 according to a specific embodiment of the present application is described.

[0144] The battery cell 102 includes a housing 1, a terminal 2, and a sealed insulating assembly 3. The housing 1 has a mounting hole 12 on its first wall 11. The terminal 2 includes a penetration portion 21 that penetrates the mounting hole 12, and a first abutting portion 22 and a second abutting portion 23 connected to the penetration portion 21 and abutting against the first wall 11 on both sides. The first abutting portion 22 abuts against the outside of the first wall 11, while the second abutting portion 23 abuts against the inside of the first wall 11. The first abutting portion 22 abuts against the first wall 11 by riveting. The sealed insulating assembly 3 is insulated and fitted between the terminal 2 and the first wall 11, and includes a first insulating member 31 at least partially disposed between the first abutting portion 22 and the first wall 11, and a second insulating member 32 at least partially disposed between the second abutting portion 23 and the first wall 11.

[0145] The first insulating member 31 includes a first main portion 311, a first extension portion 312, and a second extension portion 313. The first main portion 311 is located on the side of the first abutting portion 22 facing the first housing wall 11. The first extension portion 312 is connected to the first main portion 311 and protrudes relative to the first main portion 311 in a direction away from the first housing wall 11, and stops on the side of the first abutting portion 22 away from the central axis L of the mounting hole 12. The second extension portion 313 is connected to the first main portion 311 and extends into the mounting hole 12. The second insulating member 32 includes a second main portion 321 and a third extension portion 322. The second main portion 321 is located on the side of the second abutting portion 23 facing the first housing wall 11. The third extension portion 322 is connected to the second main portion 321 and extends into the mounting hole 12.

[0146] The elastic modulus of the first insulating member 31 is less than the elastic modulus of the second insulating member 32. The first insulating member 31 is elastically compressed between the first abutting portion 22 and the first shell wall 11 to achieve a seal between the first abutting portion 22 and the first shell wall 11. In the above technical solution, when the pole 2 is riveted to the first shell wall 11, the deformed first abutting portion 22 applies a force to the first insulating member 31. Since the elastic modulus of the first insulating member 31 is less than or equal to the elastic modulus of the second insulating member 32, the first insulating member 31 has a relatively stronger deformation capability, or relatively lower rigidity, than the second insulating member 32. Therefore, the first insulating member 31 can absorb the force applied by the riveted deformed first abutting portion 22 through deformation, thereby reducing the risk of cracking of the first insulating member 31, which is beneficial to improving the reliability of the seal between the first shell wall 11 and the pole 2, and improving the reliability of the battery cell 102.

[0147] 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.

[0148] 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 first shell wall having a mounting hole; A pole post including a penetrating portion penetrating through the mounting hole, and a first abutting portion and a second abutting portion connected to the penetrating portion and abutting against both sides of the first shell wall, wherein the first abutting portion abuts against the first shell wall by riveting; A sealing and insulating assembly, insulatingly fitted between the pole post and the first shell wall, and including a first insulating member at least partially disposed between the first abutting portion and the first shell wall, and a second insulating member at least partially disposed between the second abutting portion and the first shell wall; Wherein, the elastic modulus of the first insulating member is less than or equal to the elastic modulus of the second insulating member, and the first insulating member is elastically compressed between the first abutting portion and the first shell wall to seal between the first abutting portion and the first shell wall.

2. The battery cell according to claim 1, wherein, The first insulating member includes a first body portion and a first extending portion, the first body portion is located on a side of the first abutting portion facing the first shell wall, the first extending portion is connected to the first body portion, and protrudes away from the first shell wall relative to the first body portion, and abuts against a side of the first abutting portion away from the central axis of the mounting hole.

3. The battery cell according to claim 1 or 2, wherein The first insulating member includes a first body portion and a second extending portion, the first body portion is located on a side of the first abutting portion facing the first shell wall, the second extending portion is connected to the first body portion, and extends into the mounting hole.

4. The battery cell according to claim 3, wherein, A first corner formed at a connection portion between the second extending portion and the first body portion is disposed facing the first shell wall, and the first corner is formed as a chamfer.

5. The battery cell according to claim 3 or 4, wherein A first corner formed at a connection portion between the second extending portion and the first body portion is disposed facing the first shell wall, the first shell wall includes a second corner corresponding to the first corner, and the second corner is formed as a chamfer.

6. The battery cell according to any one of claims 1-5, wherein, The second insulating member includes: A second body portion, the second body portion is located on a side of the second abutting portion facing the first shell wall; A third extending portion, the third extending portion is connected to the second body portion, and extends into the mounting hole.

7. The battery cell according to any one of claims 1-6, wherein, The second abutting portion is disposed inside the first shell wall, and the second insulating member includes: A second body portion, the second body portion is located on a side of the second abutting portion facing the first shell wall; A fourth extending portion, the fourth extending portion is connected to a side of the second body portion away from the pole post, and is spaced between the first shell wall and an active material coating portion located inside the first shell wall.

8. The battery cell according to any one of claims 1-7, wherein, The second insulating member is elastically compressed between the second abutting portion and the first shell wall to seal between the second abutting portion and the first shell wall.

9. The battery cell according to any one of claims 1-8, wherein The elastic modulus of the first insulating member is less than or equal to 6 mpa, and the compression amount of the first insulating member is 10% - 50%.

10. The battery cell according to claim 9, wherein, The compression amount of the first insulating member is 32% - 38%.

11. The battery cell according to any one of claims 1-10, wherein, The material of the first insulating member includes one of fluororubber, perfluoroalkylated compound, polypropylene, and ethylene propylene diene monomer.

12. The battery cell according to any one of claims 1-11, wherein, In the radial direction of the mounting hole, the extending dimension of the second abutting portion is greater than or equal to the extending dimension of the first abutting portion.

13. The battery cell according to any one of claims 1-12, wherein, The first abutting portion abuts against the outer side of the first housing wall, and the second abutting portion abuts against the inner side of the first housing wall.

14. The battery cell according to any one of claims 1-13, wherein, The battery cell forms a receiving cavity inside the first housing wall. A receiving groove is formed on the pole column and opens in a direction away from the receiving cavity. The pole column has a communication hole that penetrates the groove wall of the receiving groove close to the receiving cavity and communicates the receiving cavity with the receiving groove.

15. The battery cell according to claim 14, wherein, The battery cell includes a battery core assembly. The battery core assembly includes an active material coating portion received in the receiving cavity and a conductive portion connected to the active material coating portion. The conductive portion passes through the communication hole and is at least partially received in the receiving groove.

16. The battery cell according to any one of claims 14 or 15, wherein, The battery cell includes a cover plate covering the receiving groove. A liquid injection hole that can communicate with the receiving groove is formed on the cover plate. The battery cell further includes a sealing structure for sealing the liquid injection hole.

17. A battery, wherein, It includes the battery cell according to any one of claims 1-16.

18. An electrical device, wherein, It includes the battery according to claim 17.

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