Battery cells, batteries and electrical devices

Abstract

The present invention relates to a battery cell, a battery, and an electric device, which belong to the technical field of batteries. The battery cell includes a first casing wall, a pole, a first insulating seal, and a pad member. The pole includes a hole and a first extension, the first extension extending to the outside of the outer surface or the inside of the inner surface of the first casing wall, the hole and the first extension member constituting the first pole portion. The first insulating seal member is fitted between the first pole portion and the first casing wall. The pad member is provided between the first pole portion and the first casing wall and is used to buffer the force applied to the first insulating seal member by at least one of the first pole portion and the first casing wall.

Description

[Technical Field]

[0001] This application is filed based on a Chinese patent application bearing application number 202311203218.2 and filed on September 18, 2023, and claims priority from the above Chinese patent application, the entire contents of which are incorporated herein by reference.

[0002] This application relates to the field of battery technology, and more particularly to battery cells, batteries, and electrical devices. [Background technology]

[0003] In recent years, new energy vehicles have made great strides in development, and in the field of electric vehicles, power batteries play an irreplaceable and important role as the power source for electric vehicles. Among them, power battery packs contain a number of battery cells, and the reliability of the battery cells needs to be improved. Summary of the Invention

[0004] The embodiments of the present application provide a battery cell, a battery, and an electric device that can improve the reliability of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell including a first casing wall, a pole, a first insulating seal member, and a pad member, wherein the first casing wall has a mounting hole, and the pole includes a perforation portion that is drilled into the mounting hole, and a first extension portion that is connected to the perforation portion and extends in a direction away from the central axis of the mounting hole relative to the perforation portion, the first extension portion extending to the outside of the outer surface or the inside of the inner surface of the first casing wall, the perforation portion and the first extension portion constituting a first pole portion, the first insulating seal member being fitted between the first pole portion and the first casing wall, and a pad member being provided between the first pole portion and the first casing wall, and at least one of the first pole portion and the first casing wall being used to buffer the acting force applied to the first insulating seal member.

[0006] In the above technical solution, when the pole is attached to the first casing wall, the first pole portion applies an acting force to the first insulating seal member, causing the first insulating seal member to press against the first casing wall, which causes the first casing wall to apply a counteracting force to the first insulating seal member, causing the first insulating seal member to be pressed by the first pole portion and the first casing wall, making the first insulating seal member more susceptible to cracking. By installing a pad member between the first pole portion and the first casing wall, the acting force applied by the first pole portion to the first insulating seal member and / or the counteracting force applied by the first casing wall to the first insulating seal member can be buffered, thereby reducing the risk of the first insulating seal member cracking and improving the reliability of the insulating seal fit between the first casing wall and the first pole portion, which is advantageous to improving the reliability of the battery cell.

[0007] In some embodiments, a padding member is provided between the first casing wall and the first insulating seal member and / or between the first pole portion and the first insulating seal member.

[0008] The above technical solution can facilitate the assembly of the pad member, reduce production difficulty, and simplify the structure and processing of the first insulating seal member, for example, the first insulating seal member can be manufactured as an integrated member, thereby facilitating the processing and assembly of the first insulating seal member.

[0009] In some embodiments, the pad member includes a first gasket, the first gasket being disposed between the first extension and the first insulating seal member.

[0010] In the above technical proposal, when the pole is attached to the first casing wall and the first extension portion presses the first insulating seal member toward the first casing wall, the first gasket is provided between the first insulating seal member and the first extension portion, so that the first gasket can reduce part of the acting force, thereby reducing the acting force transmitted to the first insulating seal member and ultimately reducing damage to the first insulating seal member and achieving the effect of protecting the first insulating seal member.

[0011] In some embodiments, the hardness of the material of the first gasket is greater than the hardness of the material of the first insulating seal member.

[0012] In the above technical solution, the first gasket can relatively effectively attenuate the pressure force transmitted to the first insulating seal, and can more effectively alleviate the cracking problem of the first insulating seal.

[0013] In some embodiments, the first gasket protrudes or is flush with the surface of the first insulating seal member adjacent to the perforation in a direction adjacent to the perforation.

[0014] In the above technical proposal, when the pole is attached to the first casing wall and the perforation portion presses the first insulating seal member toward the first casing wall, the first gasket protrudes or is flush with the surface of the first insulating seal member that is closest to the central axis of the mounting hole in the direction approaching the central axis of the mounting hole, so that the first gasket can reduce part of the acting force, thereby reducing the acting force transmitted to the first insulating seal member, thereby reducing damage to the first insulating seal member and achieving the effect of protecting the first insulating seal member.

[0015] In some embodiments, the pad member includes a second gasket, the second gasket being disposed between the first insulating seal member and a surface of the first casing wall facing the first extension portion, and the hardness of the material of the second gasket being less than the hardness of the material of the first insulating seal member.

[0016] In the above technical solution, when the pole is attached to the first casing wall and presses the first insulating seal member toward the first casing wall, the first insulating seal member can transmit the acting force to the second gasket, and the second gasket, because of its relatively low hardness of material, can absorb the acting force by compressive deformation, thereby reducing the reaction force fed back to the first insulating seal member and reducing damage to the first insulating seal member, thereby achieving the effect of protecting the first insulating seal member.

[0017] In some embodiments, the pad member includes a third gasket, the third gasket being disposed between the perforation and the first insulating seal member.

[0018] In the above technical solution, when the pole is attached to the first casing wall and the perforation portion presses the first insulating seal member toward the first casing wall, the third gasket is provided between the first insulating seal member and the perforation portion, so that the third gasket can reduce part of the acting force, thereby reducing the acting force transmitted to the first insulating seal member, thereby reducing damage to the first insulating seal member and achieving the effect of protecting the first insulating seal member.

[0019] In some embodiments, the pad member further includes a third gasket, the third gasket being disposed between the perforation and the first insulating seal member, and the first gasket and the third gasket being an integral member.

[0020] The above technical solution is advantageous in reducing the difficulty of installing and fixing the third gasket, and also in realizing that the first gasket and the third gasket can be installed together, which is advantageous in improving the overall assembly efficiency.

[0021] In some embodiments, the pad member is formed in an annular structure that extends completely around the circumference of the mounting hole.

[0022] In the above technical solution, the pad member is easily processed and assembled.

[0023] In some embodiments, there is a fit gap between the perforation and the first insulating seal member.

[0024] In the above technical proposal, when the pole is attached to the first casing wall and the perforation portion presses the first insulating seal member toward the first casing wall, an engagement gap is provided between the first insulating seal member and the perforation portion, making it difficult for the perforation portion to apply direct pressure to the first insulating seal member, thereby reducing the force transmitted to the first insulating seal member, reducing damage to the first insulating seal member, and achieving the effect of protecting the first insulating seal member.

[0025] In some embodiments, the connection point between the first extension portion and the perforation portion has a first corner facing the first casing wall, the first casing wall includes a second corner corresponding to the first corner, and the first insulating sealing member includes a fourth corner corresponding to the second corner, wherein the first insulating sealing member includes a second sub-portion and a second portion, the hardness of the material of the second sub-portion is less than the hardness of the material of the second portion, and the second sub-portion defines the fourth corner.

[0026] In the above technical proposal, by installing a second sub-part made of a material that is softer in hardness than the second part, the second sub-part is more likely to be compressed and deformed when subjected to force, and absorbs the force, thereby reducing the risk of the first insulating sealing member cracking from the fourth corner.

[0027] In some embodiments, the connection point between the first extension portion and the perforation portion has a first corner facing the first casing wall, the first casing wall includes a second corner corresponding to the first corner, and the first insulating seal member includes a fourth corner corresponding to the second corner, wherein at least one of the second corner and the fourth corner is formed as a chamfer.

[0028] In the above technical solution, when the pole is assembled and fixed to the first casing wall, the second corner is likely to press the fourth corner, causing the first insulating seal to crack at the position of the fourth corner; if the second corner is chamfered, the area over which the second corner applies force to the fourth corner can be increased, dispersing the force applied to reduce the concentration of the force at the fourth corner and thereby reducing the risk of the first insulating seal cracking at the position of the fourth corner; if the fourth corner is chamfered, the area over which the second corner applies force to the fourth corner can be increased, dispersing the force at the fourth corner and thereby reducing the risk of the first insulating seal cracking at the position of the fourth corner. Thus, by chamfering at least one of the second and fourth corners, the risk of the first insulating seal cracking at the position of the fourth corner can be reduced.

[0029] In some embodiments, the connection point between the first extension portion and the perforation portion has a first corner positioned toward the first casing wall, and the first insulating seal member includes a third corner positioned corresponding to the first corner, wherein the first insulating seal member includes a first sub-portion and a second portion, the hardness of the material of the first sub-portion is less than the hardness of the material of the second portion, and the first sub-portion defines the third corner.

[0030] In the above technical proposal, by installing a first sub-part made of a material that is softer in hardness than the second part, the first sub-part is more likely to be compressed and deformed when subjected to force, and absorbs the force, thereby reducing the risk of the first insulating sealing member cracking from the third corner.

[0031] In some embodiments, the connection point between the first extension portion and the perforation portion has a first corner facing the first casing wall, and the first insulating seal member includes a third corner corresponding to the first corner, wherein at least one of the first corner and the third corner is chamfered.

[0032] In the above technical solution, when the pole is assembled and fixed to the first casing wall, the first corner is likely to press the third corner, causing the first insulating seal to crack at the third corner; if the first corner is chamfered, the area over which the first corner applies force to the third corner can be increased, dispersing the force applied thereto to reduce the concentration of the applied force at the third corner and reducing the risk of the first insulating seal cracking at the third corner; if the third corner is chamfered, the area over which the third corner receives force when the first corner applies force to the third corner can be increased, dispersing the force at the third corner and thereby reducing the risk of the first insulating seal cracking at the third corner. Thus, by chamfering at least one of the first and third corners, the risk of the first insulating seal cracking at the third corner can be reduced.

[0033] In some embodiments, the pole post is flanged and riveted to form the first extension.

[0034] In the above technical solution, the terminal post can be easily processed, and the connection reliability between the first extending portion and the hole portion can be improved, which is advantageous in improving the assembly reliability between the terminal post and the first casing wall.

[0035] In some embodiments, the pole further includes a second extension portion connected to the perforation portion and extending in a direction away from the central axis of the mounting hole relative to the perforation portion, the second extension portion and the first extension portion extending to both the inner and outer sides of the first casing wall, respectively, the perforation portion and the second extension portion constituting a second pole portion, and the battery cell further includes a second insulating seal member fitted between the second pole portion and the first casing wall and installed separately from the first insulating seal member.

[0036] In the above technical solution, the pole includes a first extension portion and a second extension portion respectively arranged on the inner and outer sides of the first casing wall, making the fit between the pole and the first casing wall more stable and reliable; and the insulating seal structure includes a first insulating seal member and a second insulating seal member which are installed separately, so the first insulating seal member and the second insulating seal member can be installed separately, reducing the difficulty of assembly and ensuring the insulating seal fit effect between the pole and each location on the first casing wall.

[0037] In some embodiments, the pole includes a pole body and a pole cover plate, the pole body includes a first pole portion and a second pole portion, the first extension portion extends to the outside of the outer surface of the first casing wall, the pole cover plate is provided on a side of the first pole portion away from the second pole portion, and the pole body is welded to the pole cover plate, and the hardness of the material of the second insulating seal member is smaller than the hardness of the material of the first insulating seal member.

[0038] In the above technical solution, the hardness of the material of the first insulating seal member is greater than the hardness of the material of the second insulating seal member, and the second insulating seal member is more easily compressed and deformed than the first insulating seal member, resulting in better sealing effect, but the heat resistance of the first insulating seal member is stronger than that of the second insulating seal member, for example, the first insulating seal member is a plastic member and the second insulating seal member is a rubber member, thereby minimizing the thermal impact on the second insulating seal member when welding the pole body and the pole cover plate, and thereby improving the sealing reliability between the first casing wall and the pole.

[0039] In some embodiments, the first extension protrudes from the perforation toward the outside of the first casing wall so as to define a sunken groove between the first extension and the perforation, the edge of the pole post cover plate is installed in the sunken groove and is through-welded to the perforation, and the welded structure formed by the welding is separated from the first extension.

[0040]

[0009] In the above technical solution, the shrinkage stress caused by solidification of the molten pool formed by welding can be blocked by the above gap and is hardly or only little conducted to the first extension, thereby improving the warpage problem of the first extension and allowing the first extension to press the first insulating seal and the second insulating seal to improve the insulating sealing effect. In addition, since the edge of the electrode post cover plate is not butt-welded to the first extension but is installed in the sink groove and penetrated-welded to the drilled portion, it is not necessary to ensure a relatively small assembly gap between the edge of the electrode post cover plate and the first extension to meet the needs of butt welding, and the gap between the edge of the electrode post cover plate and the first extension can be relatively large, which improves the compatibility of the electrode post body and is advantageous to reducing the reduction in the processing precision of the electrode post cover plate and the electrode post body.

[0041] In some embodiments, the battery cell has an accommodating cavity formed inside the first casing wall, the pole includes a pole body, and the pole body has an accommodating groove formed therein that opens in a direction away from the accommodating cavity, and the pole body has a communicating hole that penetrates the groove wall on the side of the accommodating groove that is close to the accommodating cavity and communicates between the accommodating cavity and the accommodating groove.

[0042] In the above technical solution, when electrolyte is injected into the battery cell, the electrolyte is injected into the receiving groove and then flows toward the receiving cavity through the communication hole, and the receiving groove serves to buffer and store the electrolyte to prevent problems such as electrolyte splashing and overflow. Furthermore, the side walls of the receiving groove can block electrolyte splashing to some extent, reducing external contamination caused by the electrolyte and facilitating rapid electrolyte injection. Furthermore, since a separate injection passage is not required in the casing, special processing is not required for the casing, which is advantageous in reducing the complexity of the casing structure and the difficulty of processing it.

[0043] In some embodiments, the battery cell includes a battery core assembly, the battery core assembly including an active material application portion housed in the housing cavity and a conductive portion connected to the active material application portion, the conductive portion being drilled through the communication hole and at least partially housed in the housing groove.

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

[0045] In some embodiments, the pole includes a pole cover plate that is attached to the pole body, and the pole cover plate has a liquid filling hole that can communicate with the accommodating groove, and the battery cell further includes a sealing structure for sealing the liquid filling hole.

[0046] In the above technical solution, by processing the injection hole into the pole cover plate, the opening is relatively small and located toward the outside, making it relatively easy to achieve a reliable seal for the injection inlet using the sealing structure, improving the operational reliability of the battery cell and enabling flexible and diverse design of the sealing structure.

[0047] In a second aspect, embodiments of the present application further provide a battery including the battery cell of any of the above aspects.

[0048] In the above technical solutions, the reliability of the battery cell according to the embodiment of the present application is improved, which is advantageous to improving the performance of the battery.

[0049] In a third aspect, embodiments of the present application further provide an electrical device comprising the battery of any of the above aspects.

[0050] In the above technical solution, the performance of the battery is improved, which is advantageous for improving the operating power consumption performance of the electrical device. [Brief explanation of the drawings]

[0051] In order to more clearly explain the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope. Those skilled in the art can obtain other related drawings based on these drawings without any creative work. [Figure 1] 1 is a structural schematic diagram of a vehicle provided in accordance with some embodiments of the present application. [Figure 2] 1 is an exploded view of a battery structure provided in accordance with some embodiments of the present application. [Figure 3] 1 is a structural schematic diagram of a battery cell provided by some embodiments of the present application; [Figure 4] 1 is an orthographic schematic diagram of a battery cell provided in accordance with some embodiments of the present application. FIG. [Figure 5] FIG. 5 is a cross-sectional view taken along line A-A in FIG. [Figure 6] FIG. 6 is an enlarged view of a portion B circled in FIG. 5. [Figure 7] 1 is a partial cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 8] 1 is a partial cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 9] 1 is an exploded schematic view of an insulating seal structure and pad member provided by some embodiments of the present application. [Figure 10] 1 is a partial cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 11] 1 is a partial cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 12] 1 is a partial cross-sectional view of a battery cell provided in accordance with some embodiments of the present application. [Figure 13]1 is a schematic diagram of a battery cell and a bus member mated together according to some embodiments of the present application. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0052] In order to clarify the objectives, technical solutions and advantages of the embodiments of the present application, the technical solutions of the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application, but it is obvious that the described embodiments are only some of the embodiments of the present application, and do not represent all of the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without any creative work also fall within the scope of the claims of the present application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art, and the terms used in the specification of the present application are only for describing specific embodiments and are not intended to limit the present application. The terms "comprise" and "have" and any variations thereof in the specification, claims, and brief description of the drawings of the present application are intended to cover a non-exclusive inclusion. Terms such as "first," "second," etc. in the specification, claims, or drawings of the present application are used to distinguish between different objects and are not used to describe a particular order or priority.

[0054] In this application, a reference to an "embodiment" means 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 appearances of the phrase in various places in the specification do not necessarily refer to the same embodiment, nor do they refer to separate or alternative embodiments mutually exclusive of other embodiments.

[0055] In the description of this application, it should be explained that unless otherwise clearly specified or limited, the terms "mounted," "coupled," "connected," and "attached" should be broadly understood to mean, for example, a fixed connection, a detachable connection, an integral connection, a direct connection, an indirect connection via an intermediate medium, or internal communication between two elements. Those skilled in the art may understand the specific meanings of the above terms in this application depending on the specific circumstances.

[0056] The term "and / or" in this application is simply a relational relationship that describes related objects, and indicates that three types of relationships can exist. For example, A and / or B can represent three situations: the presence of only A, the simultaneous presence of A and B, and the presence of only B. In addition, the symbol " / " in this application generally indicates that the related objects before and after it are in an "or" relationship.

[0057] In the embodiments of the present application, the same drawing symbols represent the same components, and for the sake of brevity, detailed descriptions of the same components will be omitted in different embodiments. It should be understood that the dimensions such as thickness, length, width, etc. of various components in the embodiments of the present application shown in the accompanying drawings, and the overall thickness, length, width, etc. of the integrated device, are merely exemplary and should not be construed as limitations of the present application.

[0058] The term "plurality" as used herein refers to two or more (including two).

[0059] In this application, the battery cell may include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, flat, rectangular, or have other shapes, and the embodiments of this application are not limited thereto. Battery cells are generally classified into three types depending on the encapsulation method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application are not limited thereto.

[0060] The battery referred to in the embodiments of this application refers to a single physical module containing 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 case for enclosing one or more battery cells or one or more battery modules. The case can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0061] The battery cell includes a casing, a battery core assembly, and an electrolyte, and the casing is used to house the battery core assembly and the electrolyte. The battery core assembly includes at least one electrode assembly, which consists of a positive electrode piece, a negative electrode piece, and a separator film. The electrode assembly may have a wound structure, a laminated structure, or the like. The battery cell functions primarily by relying on the movement of metal ions between the positive and negative electrode pieces.

[0062] The positive electrode piece generally includes a positive electrode current collector and a positive electrode active material layer directly or indirectly coated on the positive electrode current collector, and the positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer coated thereon, and the positive electrode current collector without the positive electrode active material layer is called a positive electrode tab. For example, in a lithium-ion battery, the material of the positive electrode current collector may be aluminum, and the material of the positive electrode active material layer may be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.

[0063] The negative electrode piece generally includes a negative electrode current collector and a negative electrode active material layer applied directly or indirectly to the negative electrode current collector, and the negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer applied thereto, and the negative electrode current collector without the negative electrode active material layer is called 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.

[0064] To ensure that a large current can flow without fusing, the positive electrode tabs are stacked in multiple numbers to form a positive electrode tab portion, and the negative electrode tabs are stacked in multiple numbers to form a negative electrode tab portion. The casing is provided with poles, and the positive electrode tab portions are electrically connected to the positive electrode poles, and the negative electrode tab portions are electrically connected to the negative electrode poles. For example, the tab portions may be connected to the poles to form a direct electrical connection between the tab portions and the poles. Alternatively, for example, the battery core assembly may include adapter sheets, and the tab portions may be connected to the adapter sheets, and the adapter sheets may be connected to the poles to form an indirect electrical connection between the tab portions and the poles.

[0065] The material of the separator film is not particularly limited, and may be, for example, polypropylene or polyethylene.

[0066] In some battery cells in the related art, the poles are attached to the casing by riveting. To ensure an insulating seal between the casing and the poles, insulating plastic is usually placed between the poles and the casing before the poles are riveted. However, when the poles are riveted, the poles are subjected to force and deformed, pressing against the insulating plastic, making weak sections of the insulating plastic susceptible to cracking. Cracks in the insulating plastic affect the reliability of the insulating seal between the casing and the poles, reducing the reliability of the battery cell.

[0067] To this end, an embodiment of the present application provides a battery cell including a casing, a pole, and an insulating seal structure, wherein the casing includes a first casing wall, the first casing wall having a mounting hole, the pole including a perforation portion drilled into the mounting hole, and a first extension portion connected to the perforation portion and extending in a direction away from the central axis of the mounting hole relative to the perforation portion, the first extension portion extending to the outside of the outer surface or the inside of the inner surface of the first casing wall, the perforation portion and the first extension portion constituting a first pole portion, the insulating seal structure including a first insulating seal member fitted between the first pole portion and the first casing wall, and a pad member provided between the first pole portion and the first casing wall, the pad member being used to buffer the force applied to the first insulating seal member by at least one of the first pole portion and the first casing wall.

[0068] As a result, when the pole is attached to the first casing wall, the first pole portion applies an acting force to the first insulating seal member, and the first casing wall applies a reactive force to the first insulating seal member, so that the first insulating seal member is pressed by the first pole portion and the first casing wall, making the weak portion of the first insulating seal member more susceptible to cracking. By installing a pad member between the first pole portion and the first casing wall, the acting force applied by the first pole portion to the first insulating seal member and / or the reactive force applied by the first casing wall to the first insulating seal member is buffered, thereby reducing the risk of the first insulating seal member cracking at the weak portion, improving the reliability of the insulating seal fit between the first casing wall and the first pole portion, and being advantageous for improving the reliability of the battery cell.

[0069] An embodiment of the present application provides an electric device that uses 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, an electric scooter, an electric vehicle, a boat, a spacecraft, etc. Among them, the electric toy may include a stationary or mobile electric toy, such as a game console, an electric toy vehicle, an electric toy boat, and an electric toy airplane, and the spacecraft may include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0070] In the following embodiment, for convenience of explanation, an electric device according to an embodiment of the present invention will be described as a vehicle 1000 as an example.

[0071] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 may be a fuel-powered vehicle, a gas-powered vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, a range-extended vehicle, etc. A battery 100 is installed inside the vehicle 1000, and the battery 100 may be installed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to supply power to the vehicle 1000, for example, the battery 100 may function as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300, and the controller 200 controls the battery 100 to supply power to the motor 300, for example, to meet the operating power needs of the vehicle 1000 during starting, navigation, and driving.

[0072] In some embodiments of the present application, the battery 100 is not only used as an operating power source for the vehicle 1000, but can also provide driving power to the vehicle 1000 as a power source for the vehicle 1000, replacing or partially replacing fuel or natural gas.

[0073] Referring to FIG. 2, FIG. 2 is an exploded view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 101 and a plurality of battery cells 102, which are housed in the case 101. The case 101 is used to provide an assembly space for the battery cells 102, and the case 101 may have various structures. In some embodiments, the case 101 may include a first case body 1011 and a second case body 1012, which are covered by each other and which jointly define an assembly space for housing the battery cells 102. The second case body 1012 may have a hollow structure with one end open, and the first case body 1011 may have a plate-like structure, with the first case body 1011 covering the open side of the second case body 1012 so that the first case body 1011 and the second case body 1012 jointly define the assembly space, and both the first case body 1011 and the second case body 1012 may have a hollow structure with one end open, with the open side of the first case body 1011 covering the open side of the second case body 1012. Of course, the shape of the case 101 formed by the first case body 1011 and the second case body 1012 may be various shapes such as a cylinder or a rectangular parallelepiped.

[0074] In the battery 100, the battery cells 102 may be connected in series, parallel, or series-parallel, where series-parallel connection refers to the battery cells 102 being connected in both series and parallel. The battery cells 102 may be directly connected in series, parallel, or series-parallel, and then the entire battery cell set may be housed in the case 101. Of course, the battery 100 may also be formed by first connecting the battery cells 102 in series, parallel, or series-parallel to form a battery module, and then connecting the battery modules in series, parallel, or series-parallel to form the entire battery module and housed in the case 101. The battery 100 may further include other structures, for example, the battery 100 may further include bus members for achieving electrical welding between the battery cells 102.

[0075] Each battery cell 102 may be a secondary battery or a primary battery, and may be, but is not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cells 102 may be cylindrical, flat, rectangular, etc. For example, referring to the embodiment shown in FIG. 3 , 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, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other two by two.

[0076] 3 to 6 , in some embodiments of the present application, a battery cell 102 includes a casing 1 and a pole 2 provided in the casing 1, and an accommodating cavity 11 is formed inside the casing 1. Illustratively, the battery cell 102 includes a battery core assembly 7, which includes an active material-applied portion 71 and a conductive portion 72 connected to the active material-applied portion 71, the active material-applied portion 71 being accommodated in the accommodating cavity 11, and the conductive portion 72 being welded to the pole 2 such that the conductive portion 72 is electrically connected between the active material-applied portion 71 and the pole 2.

[0077] 5 and 6, the casing 1 includes a first casing wall 13, which has a mounting hole 12. The pole 2 is drilled into the mounting hole 12 so as to be attached to the first casing wall 13. The pole 2 includes a drilling portion 33 and a first extending portion 32, which drills into the mounting hole 12. That is, at least a portion of the drilling portion 33 is located within the mounting hole 12, and the axial direction of the mounting hole 12 is the projection direction, and a plane perpendicular to the axial direction of the mounting hole 12 is the projection plane. The projection of the drilling portion 33 on the projection plane is within the range of the projection of the mounting hole 12 on the projection plane, thereby realizing the drilling portion 33 being drilled into the mounting hole 12.

[0078] 5 and 6, the first extending portion 32 is connected to the bore portion 33 and extends relative to the bore portion 33 in a direction away from the central axis L of the mounting hole 12, and the first extending portion 32 extends to the outside of the outer surface or the inside of the inner surface of the first casing wall 13. Of these, both surfaces in the thickness direction of the first casing wall 13 are the outer surface and the inner surface, respectively, the inner surface is the surface of the first casing wall 13 facing the accommodating cavity 11, the outer surface is the surface of the first casing wall 13 facing away from the accommodating cavity 11, the side of the outer surface facing away from the accommodating cavity 11 is the outside of the outer surface, and the side of the inner surface facing the accommodating cavity 11 is the inside of the inner surface. "The first extension portion 32 extends to the outside of the outer surface or the inside of the inner surface of the first casing wall 13" means that at least a portion of the first extension portion 32 faces the first casing wall 13, the axial direction of the mounting hole 12 is the projection direction, a plane perpendicular to the axial direction of the mounting hole 12 is the projection plane, there is an area where the projection of the first extension portion 32 on the projection plane and the projection of the first casing wall 13 on the projection plane intersect, and the part of the first extension portion 32 corresponding to the intersecting area faces the first casing wall 13.

[0079] 5 and 6, the perforated portion 33 and the first extension portion 32 form the first electrode pillar portion 35, and the battery cell 102 includes a first insulating seal member 85 fitted between the first electrode pillar portion 35 and the first casing wall 13. That is, at least a portion of the first insulating seal member 85 is sandwiched between the first electrode pillar portion 35 and the first casing wall 13, and the first electrode pillar portion 35 and the first casing wall 13 are indirectly fitted together via the first insulating seal member 85, thereby achieving insulation and sealing between the first electrode pillar portion 35 and the first casing wall 13.

[0080] 5 and 6, the battery cell 102 further includes a pad member 9, which is provided between the first electrode post portion 35 and the first casing wall 13 and is used to buffer the force applied by at least one of the first electrode post portion 35 and the first casing wall 13 to the first insulating seal member 85. In this way, when the electrode post 2 is attached to the first casing wall 13, the first electrode post portion 35 applies an acting force to the first insulating seal member 85, and the first casing wall 13 applies a counteracting force to the first insulating seal member 85 (i.e., the acting force applied by the first casing wall 13 to the first insulating seal member 85 may be a counteracting force), causing the first insulating seal member 85 to be pressed by the first electrode post portion 35 and the first casing wall 13, making the weak portion of the first insulating seal member 85 prone to cracking. By installing the pad member 9 between the first pole portion 35 and the first casing wall 13, the acting force that the first pole portion 35 applies to the first insulating seal member 85 and / or the reaction force that the first casing wall 13 applies to the first insulating seal member 85 are buffered, thereby reducing the risk of the first insulating seal member 85 cracking at a weak portion, improving the reliability of the insulating seal fit between the first casing wall 13 and the first pole portion 35, and is advantageous in improving the reliability of the battery cell 102.

[0081] In short, by installing the pad member 9, the acting force applied by the first pole portion 35 to the first insulating seal member 85 can be reduced, and / or the reaction force applied by the first casing wall 13 to the first insulating seal member 85 can be reduced, thereby reducing damage to the first insulating seal member 85, thereby protecting the first insulating seal member 85 and improving the cracking problem of the first insulating seal member 85.

[0082] It should be noted that the installation position and buffering method of the pad member 9 are not limited as long as they can reduce damage to the first insulating seal member 85 during the assembly process of the terminal post 2 to the first casing wall 13. For example, in some embodiments, as shown in FIGS. 6 and 7 , the pad member 9 may be provided between the first casing wall 13 and the first insulating seal member 85 and / or between the first terminal post portion 35 and the first insulating seal member 85. That is, the pad member 9 may be provided in at least one of the locations between the first casing wall 13 and the first insulating seal member 85 and the location between the first terminal post portion 35 and the first insulating seal member 85. This facilitates assembly of the pad member 9, reduces production difficulty, and simplifies the structure and processing of the first insulating seal member 85. For example, the first insulating seal member 85 can be manufactured as an integral member, thereby facilitating processing and assembly of the first insulating seal member 85.

[0083] Of course, the present application is not limited thereto, and for example, in other embodiments of the present application, the pad member 9 may be installed at another position. For example, the first insulating seal member 85 may be installed in an assembled form, in which the pad member 9 is installed between multiple components of the first insulating seal member 85, and the hardness of the material of the pad member 9 may be set to be smaller than the hardness of the material of the first insulating seal member 85. When a force generated by assembling the electrode post 2 and the first casing wall 13 is applied to the first insulating seal member 85, the multiple components of the first insulating seal member 85 can move relative to each other, causing the pad member 9 to compress and deform to absorb the force, thereby reducing damage to the first insulating seal member 85 and protecting the first insulating seal member 85.

[0084] 6 and 7 , in some embodiments, the pad member 9 may include a first gasket 91, which is provided between the first extension portion 32 and the first insulating seal member 85. As a result, when the first extension portion 32 presses the first insulating seal member 85 toward the first casing wall 13 (e.g., presses the first insulating seal member 85 along the axial direction of the mounting hole 12) during installation of the terminal post 2 to the first casing wall 13, the first gasket 91 provided between the first insulating seal member 85 and the first extension portion 32 can reduce a portion of the acting force, thereby reducing the acting force conducted to the first insulating seal member 85 and ultimately reducing damage to the first insulating seal member 85 and providing an effect of protecting the first insulating seal member 85.

[0085] It should be noted that the hardness of the material of the first gasket 91 and the hardness of the material of the first insulating seal member 85 are not limited. For example, the hardness of the material of the first gasket 91 may be greater than the hardness of the material of the first insulating seal member 85, thereby allowing the first gasket 91 to relatively effectively attenuate the pressing force transmitted to the first insulating seal member 85 and more effectively alleviate the cracking problem of the first insulating seal member 85. For example, the first insulating seal member 85 may be a plastic member, and the first gasket 91 may be a metal member, thereby realizing that the hardness of the material of the first gasket 91 is greater than the hardness of the material of the first insulating seal member 85. For example, the first gasket 91 may be made of a steel material such as SUS304, SUS316, or SPCC, or an aluminum material such as Al 1060.

[0086] For example, as shown in FIG. 6, the thickness D of the first gasket 91 in the axial direction of the mounting hole 12 may be 0.05 mm to 2 mm, so that the thickness of the first gasket 91 is not too thin, the strength is relatively good, and the supporting function can be performed relatively effectively, thereby protecting the first insulating seal member 85 relatively well, and the thickness of the first gasket 91 is not too thick, so that the space occupied by the first gasket 91 can be reduced.

[0087] 6 , the axial direction of the mounting hole 12 is the projection direction, and the plane perpendicular to the axial direction of the mounting hole 12 is the projection plane. The overlapping area between the projection of the first gasket 91 on the projection plane and the projection of the first extension 32 on the projection plane is W1 along the radial direction of the mounting hole 12 (i.e., W1 is the projected width of the overlap between the first extension 32 and the first gasket 91). The projection of the first extension 32 on the projection plane is B along the radial direction of the mounting hole 12 (i.e., B is the width of the riveted flange of the terminal post 2). W1≧0.5 mm and / or 0.05B≦W1≦0.95B ensures that the first extension 32 and the first gasket 91 have a sufficient overlapping width, allowing the first gasket 91 to provide effective support and force-bearing properties and better protect the first insulating seal member 85.

[0088] For example, as shown in FIG. 6, the width dimension along the radial direction of the mounting hole 12 of the overlapping area between the projection of the surface of the first insulating seal member 85 facing the first extension portion 32 on the projection plane and the projection of the first extension portion 32 on the projection plane is W2 (i.e., W2 is the projection width of the overlap between the first extension portion 32 and the first insulating seal member 85), and is 0.05B≦W2≦0.95B. This allows the first extension portion 32 and the first insulating seal member 85 to have a relatively sufficient overlap width, and the first extension portion 32 can perform a relatively effective pressing action against the first insulating seal member 85, allowing the first insulating seal member 85 to provide a relatively effective insulating sealing effect.

[0089] 6 , the first gasket 91 protrudes from or is flush with the surface of the first insulating seal member 85 on the side adjacent to the perforated portion 33 in a direction approaching the perforated portion 33. As a result, when the perforated portion 33 presses the first insulating seal member 85 toward the first casing wall 13 (for example, pressing the first insulating seal member 85 radially of the mounting hole 12) during mounting of the terminal post 2 to the first casing wall 13, the first gasket 91 protrudes from or is flush with the surface of the first insulating seal member 85 on the side adjacent to the central axis L of the mounting hole 12 in a direction approaching the central axis L of the mounting hole 12. This allows the first gasket 91 to reduce a portion of the acting force, thereby reducing the acting force conducted to the first insulating seal member 85 and thereby reducing damage to the first insulating seal member 85 and providing an effect of protecting the first insulating seal member 85.

[0090] In some embodiments, the gap T between the first gasket 91 and the perforation 33 may be 0.05 mm or more, which is advantageous for assembling the first gasket 91 and the terminal post 2 and satisfies the assembly gap requirement. Furthermore, when the first gasket 91 protrudes or is flush with the surface of the first insulating seal member 85 on the side adjacent to the perforation 33 in the direction approaching the perforation 33, the gap T between the first gasket 91 and the perforation 33 may be 0.05 mm or more, which is advantageous for assembling the first gasket 91 and the terminal post 2 and satisfies the assembly gap requirement.

[0091] In some embodiments, the battery cell 102 includes an insulating seal structure 8 fitted between the first casing wall 13 and the pole 2, i.e., at least a portion of the insulating seal structure 8 is sandwiched between the first casing wall 13 and the pole 2, and the pole 2 and the first casing wall 13 are indirectly fitted together via the insulating seal structure 8, thereby realizing insulation and sealing between the first casing wall 13 and the pole 2. Among them, the pole 2 further includes a second extending portion 38 connected to the perforated portion 33 and extending in a direction away from the central axis L of the mounting hole 12 relative to the perforated portion 33, the second extending portion 38 and the first extending portion 32 extend to both the inner and outer sides of the first casing wall 13, respectively, the perforated portion 33 and the second extending portion 38 form a second pole portion 39, and the insulating seal structure 8 includes a first insulating seal member 85 fitted between the first pole portion 35 and the first casing wall 13, and a second insulating seal member 86 fitted between the second pole portion 39 and the first casing wall 13. As can be seen, the first pole portion 35 and the second pole portion 39 share the perforated portion 33.

[0092] The second insulating seal 86 and the first insulating seal 85 are generally disposed on the inner and outer sides of the first casing wall 13, respectively. The second insulating seal 86 is made of a material with a lower hardness than the first insulating seal 85, for example, a rubber material, so as to have better sealing performance when compressed. Therefore, when the hardness of the material of the first gasket 91 is greater than that of the first insulating seal 85, the first gasket 91 can provide more effective support, and the compression amount of the second insulating seal 86 can be more precisely controlled to achieve a more effective sealing effect, thereby improving the sealing performance between the terminal post 2 and the first casing wall 13.

[0093] In some embodiments, referring to FIG. 8 , the pad member 9 may include a second gasket 92, which is arranged between the first insulating seal member 85 and the surface of the first casing wall 13 facing the first extension portion 32; for example, when the first extension portion 32 extends to the outside of the outer surface of the first casing wall 13, the second gasket 92 is installed between the first extension portion 32 and the outer surface of the first casing wall 13; and, for example, when the first extension portion 32 extends to the inside of the inner surface of the first casing wall 13, the second gasket 92 is installed between the first extension portion 32 and the inner surface of the first casing wall 13, and the hardness of the material of the second gasket 92 is less than the hardness of the material of the first insulating seal member 85.

[0094] As a result, when the pole 2 is attached to the first casing wall 13 and the pole 2 presses the first insulating seal member 85 toward the first casing wall 13 (for example, pressing the first insulating seal member 85 along the axial direction of the mounting hole 12), the first insulating seal member 85 can transmit the acting force to the second gasket 92, and since the second gasket 92 has a relatively low hardness of material, it can compressively deform and absorb the acting force, thereby reducing the reaction force fed back to the first insulating seal member 85 and reducing damage to the first insulating seal member 85, thereby providing the effect of protecting the first insulating seal member 85.

[0095] 7 and 8 , in some embodiments, the pad member 9 may include a third gasket 93, which is provided between the perforated portion 33 and the first insulating seal member 85. As a result, when the perforated portion 33 presses the first insulating seal member 85 toward the first casing wall 13 (for example, pressing the first insulating seal member 85 radially of the mounting hole 12) during installation of the terminal post 2 in the first casing wall 13, the third gasket 93 provided between the first insulating seal member 85 and the perforated portion 33 can reduce part of the acting force, thereby reducing the acting force transmitted to the first insulating seal member 85, thereby reducing damage to the first insulating seal member 85 and providing an effect of protecting the first insulating seal member 85.

[0096] It should be noted that the hardness of the material of the third gasket 93 and the hardness of the material of the first insulating seal member 85 are not limited. For example, the hardness of the material of the third gasket 93 may be greater than the hardness of the material of the first insulating seal member 85, thereby allowing the third gasket 93 to relatively effectively attenuate the pressing force transmitted to the first insulating seal member 85. Alternatively, for example, the hardness of the material of the third gasket 93 may be less than the hardness of the material of the first insulating seal member 85, thereby allowing the third gasket 93 to deform and absorb the pressing force from the first pole portion 35, thereby reducing the pressing force transmitted to the first insulating seal member 85.

[0097] In some embodiments, the pad member 9 may include at least two of the first gasket 91, the third gasket 93, and the second gasket 92, i.e., the pad member 9 may include any two of the first gasket 91, the third gasket 93, and the second gasket 92, or may further include all three of the first gasket 91, the third gasket 93, and the second gasket 92 at the same time, thereby protecting the first insulating seal member 85 from multiple angles and better reducing damage caused by the first insulating seal member 85.

[0098] In some embodiments, when the pad member 9 includes the first gasket 91 and the third gasket 93 at the same time, the first gasket 91 and the third gasket 93 can be manufactured as an integral member, which is advantageous in reducing the difficulty of installing and fixing the third gasket 93, and also makes it possible to install the first gasket 91 and the third gasket 93 together, which is advantageous in improving the overall assembly efficiency.

[0099] In some embodiments, a fitting gap is provided between the first insulating seal member 85 and the perforated portion 33. When the perforated portion 33 presses the first insulating seal member 85 toward the first casing wall 13 (for example, pressing the first insulating seal member 85 radially through the mounting hole 12) during installation of the terminal post 2 in the first casing wall 13, the provision of a fitting gap between the first insulating seal member 85 and the perforated portion 33 makes it difficult for the perforated portion 33 to be directly pressed against the first insulating seal member 85. This reduces the force transmitted to the first insulating seal member 85, reduces damage to the first insulating seal member 85, and protects the first insulating seal member 85. Furthermore, providing a fitting gap between the first insulating seal member 85 and the perforated portion 33 makes it possible to omit the third gasket 93, thereby reducing costs. Of course, the present invention is not limited to this. For example, a third gasket 93 may be installed as needed, and a fitting gap is provided between the third gasket 93 and the perforated portion 33 .

[0100] In some embodiments, referring to FIG. 9 , the pad member 9 is formed in an annular structure extending completely around the mounting hole 12. For example, at least one of the first gasket 91, the second gasket 92, and the third gasket 93 is formed in an annular structure extending completely around the mounting hole 12. This facilitates processing and assembly of the pad member 9. For example, the first gasket 91 may be formed in an annular structure extending completely around the mounting hole 12, thereby facilitating processing and assembly of the first gasket 91. For example, the second gasket 92 may be formed in an annular structure extending completely around the mounting hole 12, thereby facilitating processing and assembly of the second gasket 92. For example, the third gasket 93 may be formed in an annular structure extending completely around the mounting hole 12, thereby facilitating processing and assembly of the third gasket 93.

[0101] Of course, the present application is not limited to this, and for example, in other embodiments of the present application, at least one of the pad members 9, for example the first gasket 91, the second gasket 92, and the third gasket 93, may be processed into an intermittent structure that is installed at intervals along the circumferential direction of the mounting hole 12, which is advantageous in saving material.

[0102] 7 and 8, the terminal post 2 is flanged and riveted to form the first extension 32. That is, after the terminal post 2 is assembled into the mounting hole 12 via the drilled portion 33, the first extension 32 is fabricated by employing a process of flanging and riveting. This facilitates processing of the terminal post 2 and is advantageous in improving the connection reliability between the first extension 32 and the drilled portion 33 and the assembly reliability between the terminal post 2 and the first casing wall 13.

[0103] Specifically, when the pole post 2 is flanged and riveted, it is subjected to an outward force, which makes it easier for the first extension portion 32 to apply an extrusion force along the axial direction of the mounting hole 12 to the first insulating seal member 85, and the perforation portion 33 makes it easier for the first insulating seal member 85 to apply a pressing force along the radial direction of the mounting hole 12 to the first insulating seal member 85, making the first insulating seal member 85 more susceptible to cracking due to pressure along the axial and / or radial directions of the mounting hole 12.By installing a pad member 9 to buffer the force applied to the first insulating seal member 85, the cracking problem of the first insulating seal member 85 can be improved.

[0104] For example, a first gasket 91 may be installed between the first insulating seal member 85 and the first extension portion 32. In this way, when the first extension portion 32 is formed by the flanging and riveting process, the first gasket 91 can play a supporting role, and improve the problem that the first extension portion 32 directly presses against the first insulating seal member 85, causing the first insulating seal member 85 to crack.

[0105] In some embodiments of the present application, as shown in FIG. 10 , the connection point between the first extension portion 32 and the perforation portion 33 has a first corner 34 that is located toward the first casing wall 13, i.e., the side of the connection point between the first extension portion 32 and the perforation portion 33 that is close to the first casing wall 13 is formed with the first corner 34, and the first casing wall 13 includes a second corner 131 that is located corresponding to the first corner 34, i.e., the first casing wall 13 The corner of the casing wall 13 adjacent to the first corner 34 is a second corner 131, and the first insulating seal member 85 includes a fourth corner 82 located corresponding to the second corner 131, wherein the first insulating seal member 85 includes a second sub-portion 832 and a second portion 84, the hardness of the material of the first sub-portion 831 is less than the hardness of the material of the second portion 84, and the second sub-portion 832 defines the fourth corner 82.

[0106] Since the first insulating seal member 85 includes a fourth corner 82 that is located corresponding to the second corner 131, when the pole 2 is assembled and fixed to the first casing wall 13, the pole 2 presses the first insulating seal member 85, which in turn presses the first casing wall 13, which applies a reaction force to the first insulating seal member 85. Furthermore, the reaction force applied to the first insulating seal member 85 from the second corner 131 of the first casing wall 13 at the fourth corner 82 is relatively large, making the first insulating seal member 85 prone to cracking. By installing the second sub-part 832, whose material is softer in hardness than the second part 84, the second sub-part 832 is more likely to be compressed and deformed when subjected to force and absorb the applied force, thereby reducing the risk of the first insulating seal member 85 cracking at the fourth corner 82.

[0107] In some embodiments of the present application, as shown in FIG. 11 , the connection point between the first extension portion 32 and the perforation portion 33 has a first corner 34 facing the first casing wall 13, the first casing wall 13 includes a second corner 131 corresponding to the first corner 34, and the first insulating sealing member 85 includes a third corner 81 corresponding to the first corner 34, wherein the first insulating sealing member 85 includes a first sub-portion 831 and a second portion 84, the hardness of the material of the first sub-portion 831 is less than the hardness of the material of the second portion 84, and the first sub-portion 831 defines the third corner 81.

[0108] Since the first insulating seal member 85 includes a third corner 81 that is installed in correspondence with the first corner 34, when the pole 2 is assembled and fixed to the first casing wall 13, the pole 2 presses the first insulating seal member 85, and the first insulating seal member 85 receives a relatively large force at the position of the third corner 81, making it prone to cracking. By installing the first sub-part 831, which is made of a material that is softer in hardness than the second part 84, the first sub-part 831 is prone to compressive deformation when subjected to force and absorbs the force, thereby reducing the risk of the first insulating seal member 85 cracking at the third corner 81.

[0109] It should be noted that the materials of the first portion 83 and the second portion 84 are not limited and can be specifically selected according to actual requirements. For example, the material of the first portion 83 can be a compressible rubber or plastic material, such as PFA (i.e., perfluoroalkoxyalkane), PP (i.e., polypropylene), FKM (i.e., fluororubber), or EPDM (i.e., ethylene propylene diene rubber), so that the first portion 83 has relatively good compressive deformation performance to relatively effectively improve the cracking problem. For example, the material of the second portion 84 can be selected to be an insulating material with relatively high hardness, such as PPS (i.e., polyphenylene sulfide, a new high-performance thermoplastic resin) or LCP (i.e., liquid crystal polymer), so that the second portion 84 has relatively good hardness and can play a supporting role, relatively well control the compression amount of the first insulating seal member 85, and improve sealing performance.

[0110] It should be noted that the first part 83 may further include a first sub-part 831 and a second sub-part 832, which can more comprehensively reduce the risk of the first insulating sealing member 85 cracking at the weak part and improve the structural reliability of the first insulating sealing member 85. It should be noted that the materials of the first sub-part 831 and the second sub-part 832 may be the same or different, and can be specifically set according to actual circumstances.

[0111] In some embodiments of the present application, as shown in FIG. 10 , the connection point between the first extension portion 32 and the perforation portion 33 has a first corner 34 that is positioned toward the first casing wall 13, the first casing wall 13 includes a second corner 131 that is positioned corresponding to the first corner 34, and the first insulating seal member 85 includes a fourth corner 82 that is positioned corresponding to the second corner 131, and at least one of the second corner 131 and the fourth corner 82 is formed as a chamfer (for example, an R-chamfer or a C-chamfer). That is, only the second corner 131 may be chamfered, and the fourth corner 82 may be formed into an unchamfered shape such as a right angle, acute angle, or obtuse angle, or only the fourth corner 82 may be chamfered, and the second corner 131 may be formed into an unchamfered shape such as a right angle, acute angle, or obtuse angle, or alternatively, both the second corner 131 and the fourth corner 82 may be chamfered.

[0112] When assembling and fixing the pole post 2 to the first casing wall 13, the second corner 131 is likely to press against the fourth corner 82, causing the first insulating seal member 85 to crack at the position of the fourth corner 82. If the second corner 131 is chamfered, the area over which the second corner 131 applies force to the fourth corner 82 can be increased. By dispersing the positions at which the force is applied, the applied force is less likely to be concentrated at the position of the fourth corner 82, thereby reducing the risk of the first insulating seal member 85 cracking at the position of the fourth corner 82. If the fourth corner 82 is chamfered, when the second corner 131 applies force to the fourth corner 82, the area over which the fourth corner 82 receives the force can be increased. This distributes the force at the position of the fourth corner 82, thereby reducing the risk of the first insulating seal member 85 cracking at the position of the fourth corner 82. Thus, by forming at least one of the second corner 131 and the fourth corner 82 into a chamfer, the risk of the first insulating seal member 85 cracking at the position of the fourth corner 82 can be reduced.

[0113] In some embodiments of the present application, regardless of whether at least one of the second corner 131 and the fourth corner 82 is chamfered or not, the second corner 131 and the fourth corner 82 can be installed so that there is a fitting gap between them, and in this way, the pressing force of the second corner 131 against the fourth corner 82 can be reduced to a certain extent, thereby reducing the risk of the first insulating seal member 85 cracking at the position of the fourth corner 82.

[0114] In some embodiments of the present application, as shown in FIG. 11 , the connection point between the first extension portion 32 and the perforation portion 33 has a first corner 34 that is positioned toward the first casing wall 13, the first casing wall 13 includes a second corner 131 that is positioned corresponding to the first corner 34, and the first insulating seal member 85 includes a third corner 81 that is positioned corresponding to the first corner 34, and at least one of the first corner 34 and the third corner 81 is formed as a chamfer (for example, an R-chamfer or a C-chamfer). That is, only the first corner 34 may be chamfered, and the third corner 81 may be formed in an unchamfered shape such as a right angle, acute angle, or obtuse angle, or only the third corner 81 may be chamfered, and the first corner 34 may be formed in an unchamfered shape such as a right angle, acute angle, or obtuse angle, or alternatively, both the first corner 34 and the third corner 81 may be chamfered.

[0115] When assembling and fixing the pole post 2 to the first casing wall 13, the first corner 34 is likely to press against the third corner 81, causing the first insulating seal member 85 to crack at the position of the third corner 81. If the first corner 34 is chamfered, the area over which the first corner 34 applies force to the third corner 81 can be increased. By dispersing the positions at which the force is applied, the applied force is less likely to be concentrated at the position of the third corner 81, reducing the risk of the first insulating seal member 85 cracking at the position of the third corner 81. If the third corner 81 is chamfered, when the first corner 34 applies force to the third corner 81, the area over which the third corner 81 receives the force can be increased, dispersing the force at the position of the third corner 81, thereby reducing the risk of the first insulating seal member 85 cracking at the position of the third corner 81. Thus, by forming at least one of the first corner 34 and the third corner 81 into a chamfer, the risk of the first insulating seal member 85 cracking at the position of the third corner 81 can be reduced.

[0116] In some embodiments of the present application, regardless of whether at least one of the first corner 34 and the third corner 81 is chamfered, the first corner 34 and the third corner 81 can be installed so that there is a fitting gap between them, and in this way, the pressing force of the first corner 34 against the third corner 81 can be reduced to a certain extent, thereby reducing the risk of the first insulating seal member 85 cracking at the position of the third corner 81.

[0117] It should be noted that the third corner 81 can be machined in a chamfered form regardless of whether the first sub-portion 831 is provided at the third corner 81, and the fourth corner 82 can be machined in a chamfered form regardless of whether the second sub-portion 832 is provided at the fourth corner 82.

[0118] It should be noted that when the battery cell 102 includes a first gasket 91 disposed between the first extension portion 32 and the first insulating seal member 85, as shown in Fig. 10, if the radial dimension of the first gasket 91 is sufficient, it can separate the third corner 81 from the electrode post 2 to some extent, thereby providing the effect of protecting the third corner 81. At the same time, by providing a chamfer or a second sub-portion 832 at the fourth corner 82, it is possible to provide the effect of protecting the fourth corner 82. Of course, at the same time as providing the first gasket 91, a chamfer or a first sub-portion 831 may be provided at the third corner 81 to further improve the problem of cracking at the third corner 81.

[0119] It should be noted that when the battery cell 102 includes a second gasket 92 disposed between the first insulating seal member 85 and the surface of the first casing wall 13 facing the first extension portion 32, as shown in FIG. 11 , if the radial dimension of the second gasket 92 is sufficient, it can provide a certain degree of separation between the fourth corner 82 and the first casing 1, thereby protecting the fourth corner 82. At the same time, by providing a chamfer or a first sub-portion 831 at the third corner 81, it is possible to provide a protection for the third corner 81. Of course, at the same time as providing the second gasket 92, a chamfer or a second sub-portion 832 may be provided at the fourth corner 82 to further improve the problem of cracking at the fourth corner 82.

[0120] In some embodiments of the present application, as shown in FIG. 8 , the pole 2 further includes a second extension portion 38 that is connected to the perforated portion 33 and extends away from the central axis L of the mounting hole 12 relative to the perforated portion 33, the second extension portion 38 and the first extension portion 32 extend to both the inner and outer sides of the first casing wall 13, and the perforated portion 33 and the second extension portion 38 form a second pole portion 39, and the battery cell 102 further includes a second insulating seal member 86 that is fitted between the second pole portion 39 and the first casing wall 13 and is installed separately from the first insulating seal member 85.

[0121] As a result, since the pole 2 includes a first extension portion 32 and a second extension portion 38 arranged on both the inner and outer sides of the first casing wall 13, respectively, the fit between the pole 2 and the first casing wall 13 becomes more stable and reliable, and since the insulating seal structure 8 includes a first insulating seal member 85 and a second insulating seal member 86 that are installed separately, the first insulating seal member 85 and the second insulating seal member 86 can be installed separately, reducing the difficulty of assembly and ensuring the insulating seal fit effect between the pole 2 and each location of the first casing wall 13.

[0122] Also, in some embodiments, referring to FIG. 8 , the battery cell 102 may further include a third insulating seal member 87, which may be disposed between the second extension portion 38 and the casing 1 and abut against the active material application portion 71 of the battery core assembly 7, thereby not only improving the insulation between the battery core assembly 7 and the casing 1, but also improving the stability of the fit between the battery core assembly 7 and the casing 1, and ultimately improving the reliability of the battery cell 102. Alternatively, the third insulating seal member 87 may be removed and an insulating support (not shown) may be fitted onto the end of the active material application portion 71. The insulating support abuts against the inner surface of the casing 1, thereby protecting the battery core assembly 7 when the battery core assembly 7 is attached to the casing 1 and advantageously preventing friction between the casing 1 and the battery core assembly 7. Furthermore, the insulation between the battery core assembly 7 and the casing 1 can be improved, and at the same time, the stability of the fit between the battery core assembly 7 and the casing 1 can be improved, which in turn can improve the reliability of the battery cell 102.

[0123] In some embodiments of the present application, as shown in FIG. 7 , the pole 2 includes a pole body 3 and a pole cover plate 4, the pole body 3 includes a first pole portion 35 and a second pole portion 39, the first extension portion 32 extends to the outside of the outer surface of the first casing wall 13, the pole cover plate 4 is provided to cover the side of the first pole portion 35 away from the second pole portion 39, and the pole body 3 is welded to the pole cover plate 4, and the hardness of the material of the second insulating seal member 86 is smaller than the hardness of the material of the first insulating seal member 85.

[0124] As a result, the hardness of the material of the first insulating seal member 85 is greater than the hardness of the material of the second insulating seal member 86, and the second insulating seal member 86 is more easily compressed and deformed than the first insulating seal member 85, resulting in better sealing effect, but the heat resistance of the first insulating seal member 85 is stronger than that of the second insulating seal member 86; for example, the first insulating seal member 85 is a plastic member and the second insulating seal member 86 is a rubber member.This makes it possible to minimize the thermal impact on the second insulating seal member 86 when welding the pole body 3 and the pole cover plate 4, thereby improving the sealing reliability between the first casing wall 13 and the pole 2.

[0125] In some embodiments of the present application, as shown in FIG. 7 , the first extension portion 32 protrudes from the perforation portion 33 toward the outside of the first casing wall 13 so as to define a sunken groove 31 between the first extension portion 32 and the perforation portion 33, and the edge portion of the pole post cover plate 4 is installed in the sunken groove 31 and is fully welded to the perforation portion 33, and the welded structure formed by welding is separated from the first extension portion 32.

[0126]

[0023] As a result, the shrinkage stress caused by solidification of the molten pool formed by welding can be blocked by the above-mentioned gap and is hardly or only little conducted to the first extension 32, thereby improving the warpage problem of the first extension 32 and allowing the first extension 32 to press the first insulating seal member 85 and the second insulating seal member 86 together, improving the insulating and sealing effect. In addition, since the edge of the electrode post cover plate 4 is not butt-welded to the first extension 32 but is installed in the sink groove 31 and penetrated-welded to the drilled portion 33, it is not necessary to ensure that the assembly gap between the edge of the electrode post cover plate 4 and the first extension 32 is relatively small to meet the needs of butt welding. The gap between the edge of the electrode post cover plate 4 and the first extension 32 can be relatively large, which improves the compatibility of the electrode post body 3 and is advantageous in reducing the machining precision of the electrode post cover plate 4 and the electrode post body 3.

[0127] 7 , in some embodiments of the present application, the battery cell 102 has an accommodating cavity 11 formed inside the first casing wall 13, the pole 2 includes a pole body 3, and the pole body 3 has an accommodating groove 36 formed therein that opens in a direction away from the accommodating cavity 11, and the pole body 3 has a communication hole 37 that penetrates the groove wall of the accommodating groove 36 on the side closest to the accommodating cavity 11 and communicates between the accommodating cavity 11 and the accommodating groove 36. For example, when the perforated portion 33 is annular, the accommodating groove 36 is located in the inner annular region of the perforated portion 33. For example, the accommodating groove 36 may be defined by both the perforated portion 33 and a support portion located in the inner annular region of the perforated portion 33, and the communication hole 37 penetrates the support portion.

[0128] As a result, when electrolyte is injected into the battery cell 102, the electrolyte is injected into the accommodating groove 36 and then flows toward the accommodating cavity 11 through the communication hole 37. The accommodating groove 36 serves to buffer and store the electrolyte, thereby preventing problems such as electrolyte splashing and overflow. The side walls of the accommodating groove 36 (i.e., the groove walls extending from the groove opening of the accommodating groove 36 toward the accommodating cavity 11) can block electrolyte splashing to some extent, reducing external contamination caused by the electrolyte and facilitating rapid electrolyte injection. Furthermore, because there is no need to provide a separate electrolyte injection passage in the casing 1, there is no need to perform special processing on the casing 1, which is advantageous in reducing the structural complexity of the casing 1 and the difficulty of processing it.

[0129] 12, for example, the side of the recessed groove 31 facing the central axis L of the mounting hole 12 is open so as to communicate with the accommodation groove 36. This improves the compactness of the fit between the pole body 3 and the pole cover plate 4, and simplifies the structure and processing of the pole cover plate 4.

[0130] In some embodiments of the present application, as shown in FIG. 7 , the battery cell 102 includes a battery core assembly 7, which includes an active material application portion 71 housed in the housing cavity 11 and a conductive portion 72 connected to the active material application portion 71, and the conductive portion 72 is drilled in the communication hole 37 and at least partially housed in the housing groove 36.

[0131] It should be noted that the number of communication holes 37 may be one or more, and the conductive portion 72 may be drilled in at least one of the communication holes 37. Exemplarily, at least one communication hole 37 can allow the electrolyte to pass through, for example, at least one communication hole 37 is open (i.e., no conductive portion 72 is drilled therein), thereby allowing the electrolyte to pass through without being hindered by the conductive portion 72, or, for example, at least one communication hole 37 can still allow the electrolyte to pass through after the conductive portion 72 is drilled therein.

[0132] As a result, by storing at least a portion of the conductive portion 72 in the storage groove 36, at least a portion of the conductive portion 72 occupies the space in the storage groove 36, thereby reducing the space occupied by the conductive portion 72 in the storage cavity 11 and saving space in the storage cavity 11 so that a larger volume of active material coating portion 71 can be stored, which is advantageous for improving the energy density of the battery cell 102, or for reducing the dimensions of the battery cell 102 if the energy density of the battery cell 102 remains unchanged.

[0133] As can be understood, the active material application portion 71 may include a current collector on which an active material layer is applied, and the conductive portion 72 may include only a tab portion, or may include a tab portion and an adapter sheet electrically connected to the tab portion, etc., and is not limited thereto.

[0134] In some embodiments, the conductive portion 72 is welded to the pole body 3 to form an electrical connection, thereby realizing output from the electrodes in the pole body 3 of the battery core assembly 7. For example, as shown in FIG. 7 , the conductive portion 72 is welded to the groove wall of the receiving groove 36 on the side closest to the receiving cavity 11, thereby improving the compactness of the fit and facilitating the welding operation between the two. Of course, the present application is not limited thereto, and in other embodiments, the conductive portion 72 may be welded to the pole cover plate 4 to form an electrical connection, and this is not a limitation hereof.

[0135] In some embodiments of the present application, as shown in FIG. 12 , the pole 2 includes a pole cover plate 4 that is attached to the pole body 3 as a cover, and the pole cover plate 4 is formed with a liquid filling hole 43 that can communicate with the accommodating groove 36, and the battery cell 102 further includes a sealing structure 6 for sealing the liquid filling hole 43.

[0136] In this way, when it is necessary to inject electrolyte into the battery cell 102, the sealing structure 6 is not attached to the liquid inlet 43, or the sealing structure 6 is in a state in which the liquid inlet 43 is open, and at this time, the electrolyte can be injected into the accommodating groove 36 through the liquid inlet 43. After the liquid is injected, the sealing structure 6 can be attached to the liquid inlet 43, or the sealing structure 6 can be switched to a state in which the liquid inlet 43 is closed, thereby sealing and closing the liquid inlet 43 to prevent the electrolyte from spilling and to prevent external foreign matter from entering the accommodating cavity 11 through the liquid inlet 43, thereby improving the reliability of the battery cell 102.

[0137] As a result, by processing the liquid injection hole 43 into the pole cover plate 4, the opening is relatively small and located toward the outside, making it relatively easy to achieve a reliable seal for the liquid injection inlet using the sealing structure 6, improving the operational reliability of the battery cell 102 and enabling flexible and diverse design of the sealing structure 6.

[0138] 12, the electrode post cover plate 4 does not have a portion that can be fastened to the outside of the sealing structure 6 (i.e., the side away from the receiving cavity 11), so that the sealing structure 6 can be attached to the electrode post cover plate 4 from the outside of the electrode post cover plate 4 (i.e., the side away from the receiving cavity 11). In this way, by installing the sealing structure 6 so that it can be attached to the electrode post cover plate 4 from the outside, the filling hole 43 is sealed. This makes it possible to install the sealing structure 6 after filling, ensuring the tightness of the filling hole 43, and the installation position is close to the outside, facilitating quick assembly of the sealing structure 6. In addition, the installation of the sealing structure 6 does not adversely affect the connection between the electrode post body 3 and the electrode post cover plate 4, ensuring the reliability of the connection between the electrode post cover plate 4 and the electrode post body 3.

[0139] Wherein, the sealing structure 6 may be of a removable type or a non-removable fixed type. For example, when the sealing structure 6 is of a removable type, it is convenient for maintenance of the liquid inlet 43. For example, when it is necessary to add electrolyte, the sealing structure 6 is removed, the liquid inlet 43 is opened, and the electrolyte is added and injected into the receiving cavity 11 through the liquid inlet 43. Then, the sealing structure 6 is attached, and the sealing structure 6 may be detachably connected to the pole cover plate 4 by, for example, a screw or a turnbuckle, which facilitates attachment and detachment.

[0140] For example, when the sealing structure 6 is of a non-removable fixed type, the sealing structure 6 may be fixed to the pole cover plate 4 by welding, riveting or the like, thereby improving the reliability of the sealing of the inlet hole 43 by the sealing structure 6. For example, the inlet hole 43 may be of a multi-stage type, and the sealing structure 6 may include a first sealing member 61 that is press-fitted into the inlet hole 43, and a second sealing member 62 that covers the outside of the first sealing member 61 and is welded to the pole cover plate 4.

[0141] Alternatively, in some embodiments, the second sealing member 62 may be configured to be removably connected to the pole cover plate 4 in the manner of a turnbuckle so as to restrict the first sealing member 61 to a position where it is tightly fitted with the liquid inlet hole 43.

[0142] 12 , at least a portion of the seal structure 6 is fitted within the liquid inlet 43. That is, the entire seal structure 6 may be fitted within the liquid inlet 43, or only a portion of the seal structure 6 may be fitted within the liquid inlet 43. This, on the one hand, makes full use of the space within the liquid inlet 43, improving the reliability of the seal of the liquid inlet 43 by the seal structure 6, and, on the other hand, reduces the height of the seal structure 6 protruding from the outside of the liquid inlet 43, reducing the space occupied by the seal structure 6 outside the electrode post cover plate 4. This is advantageous for reducing interference with the bus member 103, increasing the connection area between the bus member 103 and the electrode post cover plate 4, and improving the efficiency of current passage.

[0143] In some embodiments of the present application, as shown in Fig. 12, the first casing wall 13 is an integrally molded cover plate, or as shown in Fig. 7, the casing 1 further includes a second casing wall 14, where the first casing wall 13 is integrally molded with at least one second casing wall 14, and the second casing wall 14 extends toward one side in the thickness direction of the first casing wall 13. This allows for flexible design of the structural position of the pole 2, thereby increasing the application range of the battery cell 102 according to the embodiments of the present application.

[0144] It should be noted that the second casing wall 14 may extend from an edge of the first casing wall 13, and when the first casing wall 13 is rectangular, at least one of the four edges of the first casing wall 13 may extend from the second casing wall 14. For example, only one edge of the first casing wall 13 may extend from the second casing wall 14, only two edges of the first casing wall 13 may extend from the second casing wall 14, three edges of the first casing wall 13 may extend from the second casing wall 14, or all four edges of the first casing wall 13 may extend from the second casing wall 14. For example, when the casing 1 is a rectangular casing, any wall surface of the rectangular casing may be the first casing wall 13.

[0145] For example, the casing 1 may include a casing body and a cover plate, the casing body defining an open space on one side, and the cover plate being provided on the open side of the casing so as to form an accommodating cavity 11 between the casing and the cover plate; in this case, the surface of the casing body facing the cover plate is the first casing wall 13, and the wall surface of the casing body connected between the first casing wall 13 and the cover plate is the second casing wall 14; alternatively, the surface of the casing body facing the cover plate is the second casing wall 14, and the wall surface of the casing body connected between the second casing wall 14 and the cover plate is the first casing wall 13; and alternatively, the cover plate is the first casing wall 13; either is possible.

[0146] According to an embodiment of the second aspect of the present application, the embodiment of the present application further provides a battery 100 including the battery cell 102 of any of the above aspects. It should be noted that the battery 100 according to the embodiment of the present application may or may not include a case. This is advantageous in improving the reliability of the battery cell 102 according to the embodiment of the present application and therefore improving the performance of the battery 100.

[0147] 13 , the battery 100 may further include a bus member 103, and the battery cells 102 may be multiple, with at least two of the cells being electrically connected via the bus member 103. This allows the multiple battery cells 102 to be connected in series and / or in parallel. For example, when multiple battery cells 102 are connected in series, the anode pole cover plate 4 of one battery cell 102 is connected to the cathode pole cover plate 4 of the next battery cell 102 via one bus member 103, and simultaneously the cathode pole cover plate 4 of the current battery cell 102 is connected to the anode pole cover plate 4 of the previous battery cell 102 via another bus member 103.

[0148] According to an embodiment of a third aspect of the present application, an embodiment of the present application further provides an electric device including the battery 100 of any of the above aspects, wherein the battery 100 is used to supply electric energy to the electric device. The electric device may be any of the above-mentioned facilities or systems to which the battery 100 is applied. The improved performance of the battery 100 is advantageous in improving the operating power consumption performance of the electric device.

[0149] The battery cell 102 according to one specific embodiment of the present application will now be described.

[0150] The battery cell 102 includes a casing 1, a pole 2, and an insulating seal structure 8. The casing 1 includes a first casing wall 13 having a mounting hole 12, and the pole 2 includes a perforated portion 33 drilled in the mounting hole 12, a first extending portion 32 connected to the perforated portion 33 and extending in a direction away from the central axis L of the mounting hole 12 with respect to the perforated portion 33, and a second extending portion 38 connected to the perforated portion 33 and extending in a direction away from the central axis L of the mounting hole 12 with respect to the perforated portion 33, the first extending portion 32 extending to the outside of the outer surface of the first casing wall 13, and the second extending portion 38 extending to the inside of the inner surface of the first casing wall 13, and the pole 2 forming the first extending portion 32 by being flanged and riveted.

[0151] The perforated portion 33 and the first extending portion 32 constitute a first pole portion 35, the insulating seal structure 8 includes a first insulating seal member 85 fitted between the first pole portion 35 and the first casing wall 13, the perforated portion 33 and the second extending portion 38 constitute a second pole portion 39, the insulating seal structure 8 includes a second insulating seal member 86 fitted between the second pole portion 39 and the first casing wall 13 and installed separately from the first insulating seal member 85, the first insulating seal member 85 is formed as an inseparable integral member from a first portion 83 and a second portion 84, the hardness of the material of the first portion 83 is lower than the hardness of the material of the second portion 84, and the first portion 83 is provided at a corner position of the first insulating seal member 85.

[0152] The battery cell 102 includes a pad member 9 that is provided between the first pole portion 35 and the first casing wall 13 and is used to cushion the force applied to the first insulating seal member 85 by at least one of the first pole portion 35 and the first casing wall 13, and the pad member 9 includes a first gasket 91 and a second gasket 92, the first gasket 91 is provided between the first extension portion 32 and the first insulating seal member 85 and the hardness of the material of the first gasket 91 is greater than the hardness of the material of the first insulating seal member 85, and the second gasket 92 is provided between the first insulating seal member 85 and the surface of the first casing wall 13 facing the first extension portion 32 and the hardness of the material of the second gasket 92 is less than the hardness of the material of the first insulating seal member 85.

[0153] During assembly, the first insulating sealing member 85, the second insulating sealing member 86, and the electrode post 2 are first attached to the mounting hole 12 in the first casing wall 13, and then the first extension portion 32 can be processed using a riveting process. At this time, the electrode post 2 applies an acting force to the first insulating sealing member 85, and the first casing wall 13 applies a counteracting force to the first insulating sealing member 85, causing the weak points of the first insulating sealing member 85 to crack and be damaged. By installing the first gasket 91 and the second gasket 92 to buffer the acting force, this is advantageous to alleviate the problem of the weak points of the first insulating sealing member 85 cracking and improve the reliability of the battery cell 102.

[0154] It should be noted that, unless there is a contradiction, the embodiments and features of the embodiments of the present application can be combined with each other.

[0155] The above is merely a preferred embodiment of the present application, and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the scope of the present application without departing from the spirit and principles of the present application should be included in the scope of the claims of the present application. [Explanation of symbols]

[0156] Vehicle 1000, first direction X, second direction Y, third direction Z, battery 100, controller 200, motor 300, case 101, first case body 1011, second case body 1012, battery cell 102, bus member 103, casing 1, accommodating cavity 11, mounting hole 12, central axis L, first casing wall 13, second corner 131, second casing wall 14, pole 2, pole body 3, sinking groove 31, first extension portion 32, perforated portion 33, first corner 34, first pole portion 35, accommodating groove 36, communication hole 37 , second extension portion 38, second pole portion 39, pole cover plate 4, liquid filling hole 43, sealing structure 6, first sealing member 61, second sealing member 62, battery core assembly 7, active material application portion 71, conductive portion 72, insulating sealing structure 8, third corner 81, fourth corner 82, first sub-portion 831, second sub-portion 832, second portion 84, first insulating sealing member 85, second insulating sealing member 86, third insulating sealing member 87, pad member 9, first gasket 91, third gasket 93, second gasket 92.

Claims

1. A battery cell, a first casing wall having a mounting hole; a terminal post including a bore portion bored in the mounting hole and a first extending portion connected to the bore portion and extending in a direction away from the central axis of the mounting hole with respect to the bore portion, wherein the first extending portion extends to the outside of the outer surface or the inside of the inner surface of the first casing wall, and the bore portion and the first extending portion constitute a first terminal post portion; a first insulating seal member fitted between the first pole portion and the first casing wall; a pad member provided between the first pole portion and the first casing wall, and used to buffer an acting force applied to the first insulating seal member by at least one of the first pole portion and the first casing wall; Including, Battery cell.

2. the pad member is provided between the first casing wall and the first insulating seal member and / or between the first pole portion and the first insulating seal member; The battery cell according to claim 1 .

3. the pad member includes a first gasket, and the first gasket is provided between the first extension portion and the first insulating seal member; The battery cell according to claim 2 .

4. the hardness of the material of the first gasket is greater than the hardness of the material of the first insulating seal member; The battery cell according to claim 3 .

5. the first gasket protrudes from or is flush with the surface of the first insulating seal member on the side adjacent to the perforation in a direction adjacent to the perforation; The battery cell according to claim 3 or 4.

6. the pad member includes a second gasket, the second gasket being provided between the first insulating seal member and a surface of the first casing wall facing the first extension portion, and the hardness of the material of the second gasket being lower than the hardness of the material of the first insulating seal member; The battery cell according to any one of claims 2 to 5.

7. the pad member includes a third gasket, and the third gasket is provided between the perforation and the first insulating seal member. The battery cell according to any one of claims 2 to 6.

8. the pad member further includes a third gasket, the third gasket being provided between the perforated portion and the first insulating seal member, and the first gasket and the third gasket being an integral member; The battery cell according to any one of claims 3 to 5.

9. The pad member is formed in an annular structure extending around the entire circumference of the mounting hole in the circumferential direction. The battery cell according to any one of claims 1 to 8.

10. a fitting gap is provided between the perforation and the first insulating seal member; The battery cell according to any one of claims 1 to 9.

11. A connection point between the first extension portion and the perforation portion has a first corner facing the first casing wall, the first casing wall includes a second corner corresponding to the first corner, and the first insulating seal member includes a fourth corner corresponding to the second corner, wherein the first insulating seal member includes a second sub-portion and a second portion, the hardness of the material of the second sub-portion is lower than the hardness of the material of the second portion, and the second sub-portion defines the fourth corner. The battery cell according to any one of claims 3 to 5.

12. A connection point between the first extension portion and the perforation portion has a first corner that is set toward the first casing wall, the first casing wall includes a second corner that is set corresponding to the first corner, and the first insulating seal member includes a fourth corner that is set corresponding to the second corner, and at least one of the second corner and the fourth corner is formed as a chamfer. The battery cell according to any one of claims 3 to 5 and 11.

13. a connecting portion between the first extending portion and the perforated portion has a first corner facing the first casing wall, and the first insulating seal member has a third corner corresponding to the first corner, wherein the first insulating seal member includes a first sub-portion and a second portion, the hardness of the material of the first sub-portion is lower than the hardness of the material of the second portion, and the first sub-portion defines the third corner; The battery cell according to claim 6 .

14. a first corner disposed facing the first casing wall at a connection point between the first extension portion and the perforation portion, and the first insulating seal member includes a third corner disposed corresponding to the first corner, and at least one of the first corner and the third corner is chamfered; The battery cell according to claim 6 or 13.

15. The pole post is flanged and riveted to form the first extension portion. The battery cell according to any one of claims 1 to 14.

16. the electrode post further includes a second extending portion connected to the perforated portion and extending in a direction away from the central axis of the mounting hole relative to the perforated portion, the second extending portion and the first extending portion extending to both the inner and outer sides of the first casing wall, the perforated portion and the second extending portion constituting a second electrode post portion, and the battery cell further includes a second insulating seal member fitted between the second electrode post portion and the first casing wall and installed separately from the first insulating seal member. The battery cell according to any one of claims 1 to 15.

17. the pole includes a pole body and a pole cover plate, the pole body includes the first pole portion and the second pole portion, the first extension portion extends to the outside of the outer surface of the first casing wall, the pole cover plate is provided to cover the side of the first pole portion away from the second pole portion, and the pole body is welded to the pole cover plate, and the hardness of the material of the second insulating seal member is lower than the hardness of the material of the first insulating seal member. The battery cell of claim 16.

18. The first extension portion protrudes from the bore portion toward the outside of the first casing wall so as to define a sunken groove between the first extension portion and the bore portion, and an edge portion of the pole post cover plate is installed in the sunken groove and is welded to the bore portion through penetration, and a welded structure formed by welding is separated from the first extension portion. The battery cell of claim 17.

19. The battery cell has an accommodating cavity formed inside the first casing wall, the pole includes an pole body, the pole body has an accommodating groove formed therein that opens in a direction away from the accommodating cavity, and the pole body has a communication hole that penetrates a groove wall on the side of the accommodating groove that is close to the accommodating cavity and communicates the accommodating cavity with the accommodating groove. The battery cell according to any one of claims 1 to 18.

20. the battery cell includes a battery core assembly, the battery core assembly includes an active material application portion housed in the housing cavity, and a conductive portion connected to the active material application portion, the conductive portion being drilled in the communication hole and at least partially housed in the housing groove; 20. The battery cell of claim 19.

21. The pole includes a pole cover plate that is attached to the pole body as a cover, the pole cover plate has a liquid filling hole that can communicate with the accommodating groove, and the battery cell further includes a seal structure for sealing the liquid filling hole. The battery cell according to any one of claims 19 to 20.

22. A battery cell according to any one of claims 1 to 21. battery.

23. 23. The battery of claim 22, Electrical equipment.

Images