Battery monomer, battery and electric device

Abstract

The utility model provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. Wherein the single battery comprises a first shell wall, a pole and a sealing insulation assembly, the first shell wall is provided with a mounting hole, the pole comprises a penetrating part penetrating through the mounting hole, and a first abutting part and a second abutting part which are connected with the penetrating part and abut against the two sides of the first shell wall, the first abutting part abuts against the first shell wall through riveting, and the second abutting part abuts against the second shell wall through riveting. The sealing insulation assembly is matched between the pole and the first shell wall in an insulation mode and comprises a first insulation part at least partially arranged between the first abutting part and the first shell wall and a second insulation part at least partially arranged between the second abutting part and the first shell wall, and the elastic modulus of the first insulation part is smaller than or equal to the elastic film amount of the second insulation part. According to the battery monomer, the cracking risk of the first insulating part is reduced, the sealing reliability between the first shell wall and the pole is improved, and the reliability of the battery monomer is improved.

Description

Technical Field

[0001] 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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. Among them, power batteries include several battery cells, however, the reliability of battery cells needs to be improved. Summary of the invention

[0003] 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.

[0004] In a 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 penetrating the mounting hole, and a first abutting portion and a second abutting portion connected to the penetration portion and abutting against two 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.

[0005] 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 relative to the second insulating member is relatively strong, or the rigidity 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.

[0006] 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.

[0007] 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.

[0008] 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.

[0009] In the above technical solution, since the first insulating member includes a second extension portion extending into the mounting hole, the second extension portion can be used to insulate and block the penetration portion and the hole wall of the mounting hole, further reducing the risk of short circuit between the pole and the shell, and reducing the difficulty of insulating the penetration portion from the shell, thereby reducing the use of insulating members. Furthermore, since the first insulating member includes a second extension portion extending into the mounting hole, when the first insulating member is assembled to the first shell wall, the second extension portion can be used to play the role of assembly positioning, thereby improving the assembly efficiency of the first insulating member, and also improving the assembly stability of the first insulating member, which is beneficial to the assembly of the pole.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] In the above technical solution, when the pole is assembled to the first shell wall, the second corner is easy to squeeze the first corner, so that the first insulating member cracks from the position of the first corner. By setting the second corner as a chamfer, the area where the second corner applies force to the first corner can be increased, so that the force application position is dispersed, thereby reducing the position where the force is concentrated and squeezed on the first corner, thereby reducing the risk of the first insulating member cracking from the position of the first corner.

[0014] 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.

[0015] In the above technical solution, since the second insulating member includes a third extension portion extending into the mounting hole, the third extension portion can be used to insulate and block the penetration portion and the hole wall of the mounting hole, further reducing the risk of short circuit between the pole and the shell, and reducing the difficulty of insulating the penetration portion from the shell, thereby reducing the use of insulating members. Furthermore, since the second insulating member includes a third extension portion extending into the mounting hole, when the second insulating member is assembled to the first shell wall, the third extension portion can be used to play the role of assembly positioning, thereby improving the assembly efficiency of the second insulating member, and also improving the assembly stability of the second insulating member, which is beneficial to the assembly of the pole.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] In the above technical solution, the second insulating part also has the ability of elastic deformation, and can achieve sealing between the second abutting part and the first shell wall through elastic compression. In this way, not only the sealing between the first abutting part and the first shell wall is achieved by the elastic compression of the first insulating part, but also the sealing between the second abutting part and the first shell wall is achieved by the elastic compression of the second insulating part, thereby further improving the sealing effect of the sealed insulating assembly between the first shell wall and the pole.

[0020] 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%.

[0021] 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 avoided more effectively.

[0022] In some embodiments, the compression amount of the first insulating member is 32% to 38%.

[0023] 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.

[0024] In some embodiments, the material of the first insulating member includes one of fluororubber, perfluoroalkyl compound, polypropylene, and EPDM rubber.

[0025] In the above technical solution, the material of the first insulating member is simple and common, and can be easily mass-produced.

[0026] 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.

[0027] In the above technical solution, when the pole is riveted to the first shell wall and the first abutment portion is processed by the riveting process, since the radial extension dimension of the second abutment portion is greater than or equal to the radial extension dimension of the first abutment portion, the second abutment portion can reliably abut against the first shell wall and is not easy to fall out of the mounting hole, so that the riveting can be carried out smoothly, and the first abutment portion can be riveted in place, thereby improving the matching stability between the pole and the first shell after riveting.

[0028] 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.

[0029] In the above technical solution, since the first abutting portion abuts against the outer side of the first shell wall, the first insulating component can be installed from the outer side of the first shell wall, and at least a part 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 component is installed, thereby eliminating the need for a leakage check process to find out whether the first insulating component is missing, which is beneficial to improving the production efficiency of the battery cell.

[0030] In some embodiments, the battery cell forms a accommodating cavity on the inner side of the first shell wall, and a accommodating groove open toward a direction away from the accommodating cavity is formed on the pole. 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 cavities.

[0031] In the above technical solution, when injecting electrolyte into the battery cell, the electrolyte can be injected into the receiving groove and then flow toward the receiving cavity through the connecting hole, wherein the receiving groove can play the role of buffering the electrolyte to improve the problems of electrolyte splashing and overflowing. Moreover, the side wall of the receiving groove (i.e., the groove wall extending from the notch of the receiving groove toward the receiving cavity) can block the electrolyte from splashing to a certain extent, reduce the pollution of 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] In a second aspect, an embodiment of the present application further provides a battery, comprising a battery cell of any of the above-mentioned solutions.

[0037] 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.

[0038] 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.

[0039] 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

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0042] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0043] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0044] Figure 4 for Figure 3 The structural explosion diagram of the battery cell shown in;

[0045] Figure 5 A schematic diagram of an orthographic projection of a battery cell provided in some embodiments of the present application;

[0046] Figure 6 For along Figure 5 Sectional view along line AA;

[0047] Figure 7 for Figure 6 A partial enlarged view of the B part circled in the middle;

[0048] Figure 8 for Figure 7 A partial enlarged view of the C section circled in the middle;

[0049] Fig. 9 for Figure 4 Schematic diagram of the pole and sealed insulation assembly shown in;

[0050] Fig.10 A partial cross-sectional view of a battery cell according to some embodiments of the present application;

[0051] Fig.11 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0052] Fig.12 A partial cross-sectional view of a battery cell provided for some embodiments of the present application.

[0053] Reference numerals: vehicle 1000; first direction X; second direction Y; third direction Z; battery 100; controller 200; motor 300; box 101; first box body 1011; second box body 1012; battery cell 102; shell 1; accommodating chamber 10; first shell wall 11; second corner 111; mounting hole 12; central axis L; second shell wall 13; pole 2; penetration portion 21; first abutting portion 22; second abutting portion 23; accommodating groove 24; The connecting hole 25; the supporting part 26; the sealing insulating assembly 3; the first insulating member 31; the first main body 311; the first extension part 312; the second extension part 313; the first corner 314; the second insulating member 32; the second main body 321; the third extension part 322; the fourth extension part 323; the insulating bracket 33; the battery cell assembly 4; the active material coating part 41; the conductive part 42; the cover plate 5; the injection hole 51; the sealing structure 6; the first sealing member 61; the second sealing member 62; DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0056] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0057] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0058] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0059] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0060] The term "plurality" used in the present application refers to two or more (including two).

[0061] In the present 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 the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0062] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. A battery module generally includes a plurality of battery cells. A battery pack generally includes a box for encapsulating one or more battery cells or one or more battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0063] The battery cell includes a shell, a battery cell assembly and an electrolyte. The shell is used to contain the battery cell assembly and the electrolyte. The battery cell assembly includes at least one electrode assembly, which is composed of a positive electrode sheet, a negative electrode sheet and a separator. The electrode assembly can be a wound structure or a stacked structure. The battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet.

[0064] The positive electrode sheet can generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the material of the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0065] The negative electrode sheet may generally include a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is directly or indirectly coated on the negative electrode current collector, and 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 a negative electrode tab. The material of the negative electrode current collector may be copper, and the material of the negative electrode active material layer may be carbon or silicon, etc.

[0066] In order to ensure that a large current can pass without melting, the number of positive pole ears is multiple and stacked together to form the positive pole ear portion, and the number of negative pole ears is multiple and stacked together to form the negative pole ear portion. A pole column is provided on the shell, and the positive pole ear portion is electrically connected to the positive pole column, and the negative pole ear portion is electrically connected to the negative pole column. For example, the pole ear portion can be connected to the pole column to form a direct electrical connection between the pole ear portion and the pole column. For another example, the battery cell assembly may include a transfer plate, the pole ear portion is connected to the transfer plate, and the transfer plate is connected to the pole column to form an indirect electrical connection between the pole ear portion and the pole column.

[0067] The material of the isolation film is not limited, for example, it can be polypropylene or polyethylene.

[0068] In some battery cells in the related art, the pole is installed on the shell by riveting. In order to achieve insulation sealing between the shell and the pole, insulating plastic is usually arranged between the pole and the shell before riveting the pole. However, when riveting the pole, the pole will be deformed by force and squeeze the insulating plastic. The weak parts of the insulating plastic are prone to cracking due to force. Once the insulating plastic cracks, it will affect the reliability of the insulation sealing between the shell and the pole, resulting in a decrease in the reliability of the battery cell.

[0069] 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, the first shell wall having a mounting hole, the pole comprising a penetration portion penetrating the mounting hole, and a first abutment portion and a second abutment portion connected to the penetration portion and abutting on both sides of the first shell wall, the first abutment portion abutting 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 abutment portion and the first shell wall, and a second insulating member at least partially disposed between the second abutment 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, and the first insulating member being elastically compressed between the first abutment portion and the first shell wall to seal the first abutment portion and the first shell wall.

[0070] 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 modulus of the second insulating member, the deformation ability of the first insulating member relative to the second insulating member is relatively strong, or the rigidity 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.

[0071] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, 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., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0072] 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.

[0073] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may 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 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and 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.

[0074] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0075] Please refer to Figure 2 , Figure 2 An exploded view of the structure of a battery 100 provided for some embodiments of the present application. The battery 100 includes a case 101 and a plurality of battery cells 102, and the battery cells 102 are accommodated in the case 101. Among them, the case 101 is used to provide an assembly space for the battery cells 102, and the case 101 can adopt a variety of structures. In some embodiments, the case 101 may include a first case body 1011 and a second case body 1012, and the first case body 1011 and the second case body 1012 cover each other, and the first case body 1011 and the second case body 1012 jointly define an assembly space for accommodating the battery cells 102. The second box body 1012 may be a hollow structure with one end open, the first box body 1011 may be a plate-like structure, and 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 may 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 may be in various shapes, such as a cylinder, a cuboid, etc.

[0076] In the battery 100, multiple battery cells 102 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that multiple battery cells 102 are connected in series and in parallel. Multiple battery cells 102 can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by multiple battery cells 102 is accommodated in the box 101; of course, the battery 100 can also be a battery module formed by multiple battery cells 102 connected in series, in parallel, or in a hybrid connection, and then multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole, and accommodated in the box 101. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between multiple battery cells 102.

[0077] Each battery cell 102 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 102 may be cylindrical, flat, or rectangular. For example, Figure 3 The schematic diagram of the structure of the battery cell provided in some embodiments of the present application is shown in FIG. Figure 3 In the illustrated embodiment, the length direction of the battery cell 102 is the first direction X, the width direction of the battery cell 102 is the second direction Y, and the height direction of the battery cell 102 is the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0078] Figure 4 for Figure 3 The structural explosion diagram of the battery cell 102 shown in FIG. Figure 5 This is a schematic diagram of an orthographic projection of a battery cell 102 provided in some embodiments of the present application. Figure 6 For along Figure 5 The cross-sectional view along the AA line. Figure 7 for Figure 6 The enlarged view of the part B shown in the circle. In some embodiments of the present application, Figure 3 and Figure 4 and Figure 7 The battery cell 102 includes: a shell 1 and a pole 2, the pole 2 is arranged in the shell 1, and a receiving cavity 10 is formed inside the shell 1. Exemplarily, the battery cell 102 includes a battery cell assembly 4, the battery cell assembly 4 may include an active material coating part 41 and a conductive part 42 connected to the active material coating part 41, the active material coating part 41 is received in the receiving cavity 10, and the conductive part 42 is welded to the pole 2, so that the conductive part 42 is electrically connected between the active material coating part 41 and the pole 2. It can be understood that the active material coating part 41 may include a current collector coated with an active material layer, and the conductive part 42 may include only a pole ear part, or may also include a pole ear part and a transition piece electrically connected to the pole ear part, etc., which is not limited here.

[0079] Figure 8 for Figure 7 The enlarged view of the part C shown in the middle circle. Fig. 9 for Figure 4 Schematic diagram of the pole 2 and the sealed insulation assembly 3 shown in FIG. Figure 4 , Figure 8 and Fig. 9 The housing 1 includes a first housing wall 11, and a mounting hole 12 is formed on the first housing wall 11. The pole 2 is penetrated through the mounting hole 12 to be mounted on the first housing wall 11. The pole 2 includes a penetration portion 21, and the penetration portion 21 is penetrated through the mounting hole 12, that is, at least a part of the penetration portion 21 is located in the mounting hole 12, and the axial direction of the mounting hole 12 is taken as the projection direction, and the surface perpendicular to the axial direction of the mounting hole 12 is taken as the projection surface, 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, so that the penetration portion 21 can be penetrated through the mounting hole 12.

[0080] Please combine again Figure 8 and Fig. 9 The pole 2 also 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 is a side surface of the first shell wall 11 facing the accommodating cavity 10, the outer surface is a 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 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, 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, 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.

[0081] Among them, since the first abutting portion 22 and the second abutting portion 23 are respectively abutted against the first shell wall 11, wherein the abutment does not require direct contact, and can be indirect contact, as long as it has the function of stopping and limiting. Therefore, at least a portion of the first abutting portion 22 is directly opposite to the first shell wall 11 to prevent the pole 2 from moving relative to the first shell wall 11 toward the direction of the second abutting portion 23, and at least a portion of the second abutting portion 23 is directly opposite to the first shell wall 11 to prevent the pole 2 from moving relative to the first shell wall 11 toward the direction of 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 abutment 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 abutment portion 22 corresponding to the intersection area is opposite to the first shell wall 11, and the projection of the second abutment 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 abutment portion 23 corresponding to the intersection area is opposite to the first shell wall 11.

[0082] In the embodiment of the present application, the first abutting portion 22 abuts against the wall of the first shell 11 by riveting. Exemplarily, the shapes of the penetration portion 21 and the second abutting portion 23 of the pole 2 are consistent before and after assembly with the first shell wall 11, but the shape 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 against the first shell wall 11, and the first abutting portion 22 is manufactured by the process of flanging riveting to achieve the abutment of the first abutting portion 22 with the first shell wall 11. As a result, the pole 2 is easy to assemble with the first shell wall 11, and the abutment is reliable.

[0083] Please refer again Figure 7-Figure 9 The battery cell 102 further includes a sealing insulating component 3, which is insulated and matched between the pole 2 and the first shell wall 11, that is, at least a portion of the sealing insulating component 3 is sandwiched between the first shell wall 11 and the pole 2, so that the pole 2 and the first shell wall 11 are indirectly matched through the sealing insulating component 3, thereby achieving insulation and sealing between the first shell wall 11 and the pole 2. The sealing insulating component 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, so as to achieve insulation between the first abutting portion 22 and the first shell wall 11, and at least a portion of the second insulating member 32 is disposed between the second abutting portion 23 and the first shell wall 11, so as to achieve insulation between the second abutting portion 23 and the first shell wall 11.

[0084] 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, and 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. It can be understood that, since the first abutting portion 22 and the first shell wall 11 are sealed, regardless of whether the second abutting portion 23 and the first shell wall 11 are sealed, the requirement that the pole 2 and the first shell wall 11 are sealed by the sealing insulating assembly 3 can be met.

[0085] It can be understood that the first insulating member 31 can be made of a material 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.

[0086] 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.

[0087] 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 than 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.

[0088] In some embodiments of this application, please refer to Figure 7 and Figure 8 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 central axis L of the mounting hole 12.

[0089] In the above technical solution, when metal wires are formed during the riveting process, if they overflow from the edge of the first abutment portion 22 and contact the first shell wall 11, a short circuit problem is likely to occur. By setting a first extension portion 312 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 102.

[0090] In some embodiments of this application, please refer to Figure 7 and Figure 8 The first insulating member 31 includes a first main body portion 311 and a second extending portion 313 . The first main body portion 311 is located on a side of the first abutting portion 22 facing the first shell wall 11 . The second extending portion 313 is connected to the first main body portion 311 and extends into the mounting hole 12 .

[0091] In the above technical solution, since the first insulating member 31 includes the second extension portion 313 extending into the mounting hole 12, the second extension portion 313 can be used to insulate and block the penetration portion 21 from the hole wall of the mounting hole 12, further reducing the risk of short circuit between the pole 2 and the shell 1, and reducing the difficulty of insulating the penetration portion 21 from the shell 1, thereby reducing the use of insulating members. In addition, since the first insulating member 31 includes the second extension portion 313 extending into the mounting hole 12, when the first insulating member 31 is assembled to the first shell wall 11, the second extension portion 313 can be used to play the role of assembly positioning, thereby improving the assembly efficiency of the first insulating member 31, and also improving the assembly stability of the first insulating member 31, which is beneficial to the assembly of the pole 2.

[0092] Illustratively, 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 is inserted into the mounting hole 12, and then the pole 2 is riveted. Since the first insulating member 31 cooperates with the first shell wall 11 through the second extension portion 313 and the mounting hole 12, 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.

[0093] In some embodiments of this application, please refer to Figure 8 A first corner 314 disposed toward the first shell wall 11 is formed at the connection between the second extension portion 313 and the first main body portion 311. The first shell wall 11 includes a second corner 111 disposed corresponding to the first corner 314. The first corner 314 is formed as a chamfer, wherein the chamfer may be a rounded corner or a chamfered corner.

[0094] 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, so that the first insulating member 31 cracks from the position of the first corner 314. By setting the first corner 314 to a chamfered form, 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.

[0095] In some embodiments of this application, please refer to Figure 8 A first corner 314 disposed toward the first shell wall 11 is formed at the connection between the second extension portion 313 and the first main body portion 311. The first shell wall 11 includes a second corner 111 disposed corresponding to the first corner 314. The second corner 111 is formed as a chamfer, wherein the chamfer may be a rounded corner or a chamfered corner.

[0096] In the above technical solution, when the pole 2 is assembled to the first shell wall 11, the second corner 111 is easy to squeeze the first corner 314, so that the first insulating member 31 is cracked from the position of the first corner 314. By setting the second corner 111 as a chamfer, 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 and 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.

[0097] In some embodiments of this application, please refer to Figure 8 A first corner 314 is formed at the connection between the second extension portion 313 and the first main body portion 311 and is arranged toward the first shell wall 11. The first shell wall 11 includes a second corner 111 arranged corresponding to the first corner 314. The first corner 314 is formed as a chamfered corner or a beveled corner, and the second corner 111 is formed as a chamfered corner or a beveled corner.

[0098] 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, so that the first insulating member 31 cracks 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.

[0099] In some embodiments of this application, please refer to Figure 8Regardless of whether at least one of the second corner 111 and the first corner 314 is processed into a chamfered form, a fitting gap can be set between the second corner 111 and the first corner 314. 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.

[0100] In some embodiments of this application, please refer to Figure 8 The second insulating member 32 includes: a second body portion 321 and a third extension portion 322 . The second body portion 321 is located on a side of the second abutting portion 23 facing the first shell wall 11 . The third extension portion 322 is connected to the second body portion 321 and extends into the mounting hole 12 .

[0101] In the above technical solution, since the second insulating member 32 includes the third extension portion 322 extending into the mounting hole 12, the third extension portion 322 can be used to insulate and block the penetration portion 21 from the hole wall of the mounting hole 12, further reducing the risk of short circuit between the pole 2 and the shell 1, and reducing the difficulty of insulating the penetration portion 21 from the shell 1, thereby reducing the use of insulating members. In addition, since the second insulating member 32 includes the third extension portion 322 extending into the mounting hole 12, when the second insulating member 32 is assembled to the first shell wall 11, the third extension portion 322 can be used to play the role of assembly positioning, thereby improving the assembly efficiency of the second insulating member 32, and also improving the assembly stability of the second insulating member 32, which is beneficial to the assembly of the pole 2.

[0102] Exemplarily, 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 is inserted into the mounting hole 12, and then the pole 2 is riveted. Since the second insulating member 32 cooperates with the first shell wall 11 through the third extension portion 322 and the mounting hole 12, 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.

[0103] Fig.10 This 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 Fig.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 extending 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 extending 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.

[0104] 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.

[0105] In the related art, an insulating bracket needs to be arranged between the active material coating portion and the first shell wall. In the above technical solution, the second insulating member and the insulating bracket are integrated into one, thereby saving parts, improving assembly efficiency, and reducing production costs. In addition, the radial extension dimension W2 of the second abutting portion 23 in the mounting hole 12 can be reduced, reducing the cost of the pole 2, while reducing the surface area of ​​the pole 2 and improving the compressive strength of the pole 2.

[0106] Of course, the present application is not limited thereto. For example, in other embodiments of the present application, please refer to Figure 8 The second insulating member 32 may also not include the fourth extension portion 323 . In this case, the insulating bracket 33 , which is separately provided from the second insulating member 32 , may play an insulating role between the first shell wall 11 and the active material coating portion 41 .

[0107] 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 .

[0108] 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 the sealing between the first abutting portion 22 and the first shell wall 11 is achieved through the elastic compression of the first insulating member 31, but also the sealing between the second abutting portion 23 and the first shell wall 11 is achieved through 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.

[0109] It is worth noting that, no matter 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 .

[0110] 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 the difficulty of production. 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 improved, and it is helpful to reduce the difficulty of controlling the compression amount of the sealed insulating assembly 3.

[0111] 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 amount 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 amount of the first insulating member 31 is 10%, 20%, 30%, 40%, 50%, etc. It has been verified by experiments that by setting the elastic modulus of the first insulating member 31 to be less than or equal to 6 MPa, and the compression amount 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 be greater than 6 MPa, and the compression amount of the first insulating member 31 is less than 10%, the first insulating member 31 is prone to cracking when riveting the pole 2.

[0112] Exemplarily, when the elastic modulus of the first insulating member 31 is less than or equal to 6 MPa, the compression amount of the first insulating member 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.

[0113] It is worth noting that for materials, the elastic modulus refers to the ratio between the deformation and stress of the material when a force is applied, which describes the degree of elastic deformation of the material. For example, for rubber materials, the elastic modulus characterizes the degree of deformation of the material when it is subjected to force. The smaller the elastic modulus, the greater the elasticity of the material and the better the deformation ability. Conversely, the larger the elastic modulus, the smaller the deformation ability. Rubber materials will deform to a certain extent after being subjected to force. Compression refers to the amount of deformation that occurs when the material is compressed. For rubber materials, due to the particularity of their structure and properties, the range of their compression varies greatly. Generally, the larger the elastic modulus, the smaller the compression. Therefore, in the process of rubber product production and application, the required performance can be obtained by controlling the elastic modulus and compression of rubber materials according to different needs.

[0114] In some embodiments of the present application, the material of the first insulating member 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 member 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 member 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 member. Its elastic modulus is about 20Gpa, and its stiffness is much greater than the stiffness of the first insulating member 31 with an elastic modulus less than or equal to 6mpa in this embodiment, and there is a risk of cracking.

[0115] Exemplarily, 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 amount of 10% to 50%, and an elastic modulus of about 6 MPa. Experimental verification shows that no cracking problem occurs when the pole 2 is riveted.

[0116] It is understood that the riveting stroke of the first abutting portion 22 of the pole 2 can be controlled so that the compression amount of the first insulating member 31 meets the requirements, thereby meeting the requirements of reliable sealing. It is understood that the wall thickness of the first body portion 311 of the first insulating member 31 is X, and the thickness becomes Y after riveting. At this time, the compression amount is (XY) / Y. For example, X is 1.1mm, Y is 0.7mm, and the compression amount is (1.1-0.7) / 1.1≈36%.

[0117] In addition, 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 type of high-performance thermoplastic resin) or LCP (liquid crystal polymer), etc., so that the second insulating member 32 has greater rigidity and plays a supporting role, so that the compression amount of the sealed insulating assembly 3 can be better controlled, thereby improving the sealing performance.

[0118] In some embodiments of the present application, reference 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 the radial direction, 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.

[0119] 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 escape from the mounting hole 12, thereby facilitating the smooth riveting, so that the first abutting portion 22 can be riveted in place, thereby improving the matching stability between the pole 2 and the first shell 1 after riveting.

[0120] In some embodiments of the present application, reference Figure 8 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" is the side of the first shell wall 11 facing the accommodating cavity 10, and the opposite side is the "outer side", that is, the side away from the accommodating cavity 10.

[0121] 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 part of it can be exposed from the outer side of the first shell wall 11. Whether the first insulating member 31 is installed can be directly observed from the outer side of the first shell wall 11, so that it is not necessary to perform a leakage inspection process to find out whether the first insulating member 31 is missing, which is beneficial to improve the production efficiency of the battery cell 102.

[0122] In some embodiments of the present application, Fig.11 As shown, the battery cell 102 is formed with a receiving cavity 10 on the inner side of the first shell wall 11, and the pole 2 is formed with a receiving groove 24 that is open in a direction away from the receiving cavity 10. The pole 2 has a connecting hole 25, which penetrates the groove wall of the receiving groove 24 on one side close 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 area of ​​the penetration portion 21, and the receiving groove 24 can be defined by the penetration portion 21 and the support portion 26 located in the inner ring area of ​​the penetration portion 21.

[0123] Thus, when injecting electrolyte 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 and overflow. Moreover, the side wall of the receiving groove 24 (i.e., 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.

[0124] In some embodiments of the present application, Fig.11As shown, the battery cell 102 includes a cell assembly 4, which includes an active material coating portion 41 received in the receiving cavity 10, and a conductive portion 42 connected to the active material coating portion 41, and the conductive portion 42 is penetrated through the connecting hole 25 to be at least partially received in the receiving groove 24.

[0125] It is worth noting that there may be one or more communicating holes 25, and the conductive part 42 may be provided through at least one of the communicating holes 25. Exemplarily, at least one communicating hole 25 can pass electrolyte, for example, at least one communicating hole 25 is vacant (i.e., the conductive part 42 is not provided), so that the electrolyte can pass through without being hindered by the conductive part 42, and for another example, at least one communicating hole 25 can still pass electrolyte after the conductive part 42 is provided.

[0126] 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, which is beneficial to improving the energy density of the battery cell 102, or when the energy density of the battery cell 102 remains unchanged, it is beneficial to reduce the size of the battery cell 102.

[0127] In some embodiments, the conductive portion 42 is welded to the pole 2 to form an electrical connection, thereby realizing the output of the battery cell assembly 4 from the electrode at the pole 2. Fig.11 As shown, the conductive part 42 is welded to the side wall of the receiving groove 24 close to the receiving cavity 10, so as to improve the compactness of the fit and facilitate the welding operation of the two. Of course, the present application is not limited to this. In other embodiments, the conductive part 42 can also be set to be welded to the cover plate 5 to form an electrical connection, which is not limited here.

[0128] In some embodiments, Fig.12 As shown, the battery cell 102 includes a cover plate 5 covering the receiving groove 24, and a liquid injection hole 51 that can be communicated with the receiving groove 24 is formed on the cover plate 5. The battery cell 102 also includes a sealing structure 6 for sealing the liquid injection hole 51. In this way, when it is necessary to inject electrolyte into the battery cell 102, the sealing structure 6 is not installed at the liquid injection hole 51 first, or the sealing structure 6 is in a state of opening the liquid injection hole 51, and the electrolyte can be injected into the receiving groove 24 through the liquid injection hole 51. And after the injection, the sealing structure 6 can be installed at the liquid injection hole 51, or the sealing structure 6 can be switched to a state of closing the liquid injection hole 51, so as to seal and close the liquid injection hole 51 to prevent the electrolyte from overflowing and prevent external foreign matter from entering the receiving cavity 10 from the liquid injection hole 51, thereby improving the reliability of the battery cell 102.

[0129] 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 reliably sealed more easily through the sealing structure 6, thereby improving the working reliability of the battery cell 102 and realizing flexible and diversified design of the sealing structure 6.

[0130] In some embodiments, Fig.12 As shown, the cover plate 5 does not have a portion that stops at the outside of the sealing structure 6 (i.e., the side away from the accommodating chamber 10), so that the sealing structure 6 is suitable for being installed to the cover plate 5 from the outside of the cover plate 5 (i.e., the side away from the accommodating chamber 10). In this way, by setting the sealing structure 6 to be installed to the cover plate 5 from the outside of the cover plate 5 to seal the injection hole 51, the sealing structure 6 is installed after the injection, which can ensure the sealing of the injection hole 51, and the installation position is close to the outside, which is convenient for the rapid assembly of the sealing structure 6. Moreover, the installation of the sealing structure 6 will not have an adverse effect on the connection between the pole 2 and the cover plate 5, ensuring the reliability of the connection between the cover plate 5 and the pole 2.

[0131] The sealing structure 6 can be in a detachable form or in a non-detachable fixed form. For example, when the sealing structure 6 is in a detachable form, 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 and injected 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, so as to facilitate disassembly and assembly.

[0132] 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, etc., so as to improve the sealing reliability of the sealing structure 6 to the injection hole 51. For example, the 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 injection hole 51, and a second sealing member 62 that covers the outside of the first sealing member 61 and is welded to the cover plate 5. Alternatively, in some embodiments, the second sealing member 62 can be set to be detachably connected to the cover plate 5 by means of a screw buckle, so as to limit the first sealing member 61 to a position that is interference-fitted with the injection hole 51.

[0133] In some embodiments of the present application, Fig.12As shown, at least part of the sealing structure 6 is embedded in the injection hole 51. That is, the sealing structure 6 can be fully embedded in the injection hole 51, or only part of the sealing structure 6 can be embedded in the injection hole 51. Thus, on the one hand, the space in the injection hole 51 can be fully utilized to improve the sealing reliability of the sealing structure 6 to the injection hole 51, and on the other hand, the height of the sealing structure 6 protruding outside the injection hole 51 can be reduced, and the space occupied by the sealing structure 6 outside the cover plate 5 can be reduced, which is conducive to reducing the interference effect on the confluence component, increasing the connection area between the confluence component and the cover plate 5, and improving the flow efficiency.

[0134] In some embodiments of the present application, the first shell wall 11 is an integrally formed cover plate 5, or the shell 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. Thus, the flexible design of the structural position of the pole 2 can be achieved, thereby increasing the applicable range of the battery cell 102 of the embodiment of the present application.

[0135] It is worth noting that the second shell wall 13 can extend from the 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 the second shell wall 13. For example, only one edge of the first shell wall 11 extends from the second shell wall 13. The first shell wall 11 can also have only two edges that extend from the second shell wall 13 respectively. The first shell wall 11 can also have three edges that extend from the second shell wall 13 respectively. The first shell wall 11 can also have four edges that extend from the second shell wall 13. Exemplarily, when the shell 1 is a rectangular shell, any wall surface of the rectangular shell can serve as the first shell wall 11.

[0136] 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.

[0137] According to the second aspect of the present application, the present application also provides a battery 100, including a battery cell 102 of any of the above solutions. It is worth noting that the battery 100 according to the embodiment of the present application may include a box body 101, or may not include a box body 101. Therefore, since the reliability of the battery cell 102 according to the embodiment of the present application is improved, it is beneficial to improve the performance of the battery 100.

[0138] Exemplarily, the battery 100 may further include a busbar component, and the battery cells 102 are multiple and at least two are electrically connected through the busbar component. Thus, multiple battery cells 102 can be connected in series and / or in parallel. For example, when multiple battery cells 102 are connected in series, the cover plate 5 of the anode of one battery cell 102 is connected to the cover plate 5 of the cathode of the next battery cell 102 through a busbar component, and the cover plate 5 of the cathode of the battery cell 102 is connected to the cover plate 5 of the anode of the previous battery cell 102 through another busbar component.

[0139] According to the third aspect of the present application, the present application also provides an electric device, including the battery 100 of any of the above solutions, and the battery 100 is used to provide power to the electric device. The electric device can be any of the above-mentioned devices or systems using the battery 100. Since the performance of the battery 100 is improved, it is beneficial to improve the working power performance of the electric device.

[0140] Next, a battery cell 102 according to a specific embodiment of the present application is described.

[0141] The battery cell 102 includes: a shell 1, a pole 2 and a sealing insulation assembly 3. The first shell wall 11 of the shell 1 has a mounting hole 12. The pole 2 includes a penetration portion 21 that penetrates the mounting hole 12, and a first abutting portion 22 and a second abutting portion 23 that are connected to the penetration portion 21 and abut against both sides of the first shell wall 11. 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 first abutting portion 22 abuts against the first shell wall by riveting. The sealing insulation assembly 3 is insulated and fitted between the pole 2 and the first shell wall 11, and includes a first insulating member 31 that is at least partially disposed between the first abutting portion 22 and the first shell wall 11, and a second insulating member 32 that is at least partially disposed between the second abutting portion 23 and the first shell wall 11.

[0142] The first insulating member 31 includes a first body portion 311, a first extension portion 312, and a second extension portion 313. The first 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 body portion 311 and protrudes relative to the first 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 central axis L of the mounting hole 12. The second extension portion 313 is connected to the first body portion 311 and extends into the mounting hole 12. The second insulating member 32 includes a second body portion 321 and a third extension portion 322. The second body portion 321 is located on the side of the second abutting portion 23 facing the first shell wall 11. The third extension portion 322 is connected to the second body portion 321 and extends into the mounting hole 12.

[0143] The elastic modulus of the first insulating member 31 is smaller than the elastic film of the second insulating member 32, and 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. In the above technical solution, when the pole 2 is riveted to the first shell wall 11, the deformed first abutting portion 22 will apply a force to the first insulating member 31. Since the elastic modulus of the first insulating member 31 is smaller than or equal to the elastic film 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 rigidity is relatively small. Therefore, the first insulating member 31 can absorb the force applied by the first abutting portion 22 deformed by riveting 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.

[0144] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0145] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A first shell wall having a mounting hole; A pole, comprising a penetration portion penetrated through the mounting hole, and a first abutting portion and a second abutting portion connected to the penetration portion and abutting against two sides of the first shell wall, wherein the first abutting portion abuts against the first shell wall by riveting; A sealed insulating assembly, insulatively 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 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.

2. The battery cell according to claim 1, characterized in that: 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 central axis of the mounting hole.

3. The battery cell according to claim 1, characterized in that: 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. The second extending portion is connected to the first main body portion and extends into the mounting hole.

4. The battery cell according to claim 3, characterized in that: 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.

5. The battery cell according to claim 3, characterized in that: 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. The first shell wall includes a second corner disposed corresponding to the first corner. The second corner is formed as a chamfer.

6. The battery cell according to claim 1, characterized in that: The second insulating member comprises: a second body portion, the second body portion being located on a side of the second abutting portion facing the first shell wall; A third extension portion is connected to the second main body portion and extends into the mounting hole.

7. The battery cell according to claim 1, characterized in that: The second abutting portion is disposed on the inner side of the first shell wall, and the second insulating member includes: a second body portion, the second body portion being located on a side of the second abutting portion facing the first shell wall; A fourth extension portion is connected to a side of the second body portion away from the pole and is spaced between the first shell wall and the active material coating portion located inside the first shell wall.

8. The battery cell according to claim 1, characterized in that: 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.

9. The battery cell according to claim 1, characterized in that: 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%.

10. The battery cell according to claim 9, characterized in that: The compression amount of the first insulating member is 32% to 38%.

11. The battery cell according to claim 1, characterized in that: The material of the first insulating member includes one of fluororubber, perfluoroalkyl compound, polypropylene, and EPDM rubber.

12. The battery cell according to claim 1, characterized in that: 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.

13. The battery cell according to claim 1, characterized in that: 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.

14. The battery cell according to any one of claims 1 to 13, characterized in that: The battery cell is formed with a receiving cavity on the inner side of the first shell wall, and the pole is formed with a receiving groove which is open in a direction away from the receiving cavity. The pole is provided with a connecting hole which penetrates the groove wall on one side of the receiving groove close to the receiving cavity and connects the receiving cavity with the receiving groove.

15. The battery cell according to claim 14, characterized in that: The battery cell comprises a cell assembly, the cell assembly comprises an active material coating portion received in the receiving cavity, and a conductive portion connected to the active material coating portion, the conductive portion is passed through the connecting hole to be at least partially received in the receiving groove.

16. The battery cell according to claim 14, characterized in that: 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.

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

18. An electrical device, characterized in that: Comprising a battery according to claim 17.

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