Battery cell, battery, and electric device

Abstract

The application provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a first shell wall, a pole and an insulating sealing structure. The pole comprises a penetrating part and a first extension part. The first extension part extends to the outside of the outer surface of the first shell wall or the inside of the inner surface of the first shell wall. The connection part of the first extension part and the penetrating part is provided with a first corner towards the first shell wall. The first shell wall comprises a second corner corresponding to the first corner. The insulating sealing structure is matched between the first shell wall and the pole and comprises a first part and a second part. The material hardness of the first part is less than that of the second part. The first part is arranged close to at least one of the first corner and the second corner relative to the second part. The battery monomer is beneficial to reducing the risk of cracking of the insulating sealing structure, improving the reliability of the insulating sealing cooperation between the first shell wall and the pole, and improving the reliability of the battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery, as the power source, plays an irreplaceable and crucial role. The power battery comprises several individual battery cells; however, the reliability of these individual cells needs improvement. Summary of the Invention

[0003] This application provides a battery cell, a battery, and an electrical device that can improve the reliability of the battery cell.

[0004] In a first aspect, embodiments of this application provide a battery cell including a first shell wall, a terminal post, and an insulating sealing structure. The first shell wall has a mounting hole. The terminal post includes a through portion passing through the mounting hole and a first extension portion connected to the through portion and extending in a direction away from the central axis of the mounting hole relative to the through portion. The first extension portion extends to the outer side of the outer surface or the inner side of the inner surface of the first shell wall. The connection between the first extension portion and the through portion has a first corner facing the first shell wall. The first shell wall includes a second corner corresponding to the first corner. The insulating sealing structure is fitted between the first shell wall and the terminal post and includes a first part and a second part. The material hardness of the first part is less than that of the second part. The first part is disposed relatively close to at least one of the first corner and the second corner relative to the second part.

[0005] In the above technical solution, when the terminal post is installed on the first shell wall, the terminal post exerts a force on the insulating sealing structure mating between the terminal post and the first shell wall. This causes the insulating sealing structure to compress the first shell wall, and the first shell wall then exerts a reaction force on the insulating sealing structure. The insulating sealing structure experiences relatively concentrated force at the first corner and / or the second corner, making these weak points prone to cracking. By configuring the insulating sealing structure to include a first part and a second part, where the material hardness of the first part is less than that of the second part, and the first part is positioned closer to at least one of the first and second corners relative to the second part, the insulating sealing structure uses the relatively softer first part at the weak point. The first part is more easily compressed and deformed under force than the second part, absorbing the force and reducing the risk of cracking at the weak point. This improves the reliability of the insulating sealing fit between the first shell wall and the terminal post, thus enhancing the reliability of the battery cell. Furthermore, by providing a second part with a harder material than the first part, the second part can act as a support, allowing for better control of the compression of the insulating sealing structure and achieving a more effective sealing effect, thereby improving the sealing performance between the terminal post and the first shell wall.

[0006] In some embodiments, the insulating sealing structure comprises a third corner corresponding to the first corner, and the first portion comprises a first sub-portion disposed close to the third corner relative to the second portion.

[0007] In the above technical solution, since the insulating sealing structure comprises a third corner corresponding to the first corner, when the pole is assembled and fixed to the first shell wall, the pole will extrude the insulating sealing structure, and the third corner of the insulating sealing structure is relatively large in stress and is prone to cracking. By disposing the first sub-portion with a material hardness relatively softer than the second portion, the first sub-portion is prone to compression deformation under stress, thereby reducing the risk of cracking of the insulating sealing structure from the third corner.

[0008] In some embodiments, the first sub-portion defines a partial outer surface of the third corner.

[0009] In the above technical solution, the first sub-portion is exposed to the outer surface of the insulating sealing structure at a position close to the first corner, thereby better compression deformation under stress, which is more beneficial to improve the cracking problem of the action force. Moreover, such a configuration can also reduce the processing difficulty of combining the first sub-portion and the second portion together.

[0010] In some embodiments, the side surface of the insulating sealing structure facing the first extension portion comprises a first surface portion defined by the first sub-portion, and the side surface of the insulating sealing structure facing the first extension portion further comprises a second surface portion defined by the second portion, and the first surface portion protrudes from or is flush with the second surface portion.

[0011] In the above technical solution, since the side surface of the insulating sealing structure facing the first extension portion comprises a first surface portion defined by the first sub-portion, the extrusion force from the first extension portion can be better buffered, and the cracking problem of the third corner caused by the extrusion force from the first extension portion can be more effectively improved. Moreover, since the side surface of the insulating sealing structure facing the first extension portion comprises a second surface portion defined by the second portion, the second portion can be used to support in the axial direction of the mounting hole, so that the compression amount of the insulating sealing structure can be better controlled to achieve a more effective sealing effect, thereby improving the sealing performance between the pole and the first shell wall. Moreover, since the first surface portion is not recessed below the second surface portion, the first surface portion can not be affected by the second surface portion when the pole extrudes the third corner of the insulating sealing structure, and timely buffers the action, protects the third corner of the insulating sealing structure, and improves the cracking problem at this position. Moreover, since the first surface portion protrudes from or is flush with the second surface portion, the flexibility of processing and design of the insulating sealing structure can be improved.

[0012] In some embodiments, the side surface of the insulation sealing structure facing the penetrating part includes a third surface portion defined by the first sub-portion, and the side surface of the insulation sealing structure facing the penetrating part further includes a fourth surface portion defined by the second portion, and the third surface portion is higher than or flush with the fourth surface portion.

[0013] In the above technical solution, the first sub-portion defines the third surface portion in the side surface of the insulation sealing structure facing the penetrating part, so that the extrusion force from the penetrating part can be better buffered, and the cracking problem of the third corner caused by the extrusion force from the penetrating part can be more effectively improved. Moreover, the third surface portion is not recessed lower than the fourth surface portion, so that when the pole extrudes the third corner position of the insulation sealing structure, the third surface portion can not be affected by the fourth surface portion and timely play a buffering role to protect the third corner position of the insulation sealing structure and improve the cracking problem at this position. Furthermore, the third surface portion is higher than or flush with the fourth surface portion, so that the flexibility of processing and design of the insulation sealing structure can be improved.

[0014] In some embodiments, the insulation sealing structure includes a fourth corner corresponding to the second corner, and the first portion includes a second sub-portion arranged close to the fourth corner relative to the second portion.

[0015] In the above technical solution, the insulation sealing structure includes the fourth corner corresponding to the second corner. When the pole is assembled and fixed to the first shell wall, the pole will extrude the insulation sealing structure, the insulation sealing structure will extrude the first shell wall, the first shell wall will apply a counterforce to the insulation sealing structure, and the counterforce applied to the fourth corner of the insulation sealing structure by the second corner of the first shell wall is relatively large, which is prone to cracking. By arranging the second sub-portion with a material hardness relatively softer than the second portion, the second sub-portion is prone to compression deformation under stress, thereby absorbing the stress, so that the risk of cracking of the insulation sealing structure at the fourth corner can be reduced.

[0016] In some embodiments, the second sub-portion defines a partial outer surface of the fourth corner.

[0017] In the above technical solution, the second sub-portion is exposed to the outer surface of the insulation sealing structure at a position close to the second corner, so that the compression deformation under stress can occur better, which is more beneficial to buffering the force and improving the cracking problem at this position. Furthermore, such arrangement can also reduce the processing difficulty of combining the first sub-portion and the second portion together.

[0018] In some embodiments, the penetrating part and the insulation sealing structure have a fitting gap therebetween.

[0019] In the above technical solution, the penetrating part is not easy to directly extrude the insulation sealing structure, thereby the force transmitted to the insulation sealing structure can be reduced, the damage to the insulation sealing structure can be reduced, and the insulation sealing structure can be protected.

[0020] In some embodiments, the second portion and the first portion are each an annular structure extending entirely around the circumference of the mounting hole.

[0021] In the above technical solution, the processing and assembly are facilitated, and the cracking problem is improved.

[0022] In some embodiments, the insulating sealing structure comprises a third corner corresponding to the first corner, at least one of the first corner and the third corner is formed as a chamfer, and / or the first corner and the third corner have a fit gap therebetween.

[0023] In the above technical solution, the extrusion of the first corner on the third corner can be reduced to some extent, thereby reducing the risk of cracking of the insulating sealing structure from the position of the third corner.

[0024] In some embodiments, the insulating sealing structure comprises a fourth corner corresponding to the second corner, at least one of the second corner and the fourth corner is formed as a chamfer, and / or the second corner and the fourth corner have a fit gap therebetween.

[0025] In the above technical solution, the extrusion of the second corner on the fourth corner can be reduced to some extent, thereby reducing the risk of cracking of the insulating sealing structure from the position of the fourth corner.

[0026] In some embodiments, the battery monomer comprises a first gasket, which is arranged between the first extension and the insulating sealing structure.

[0027] In the above technical solution, when the pole is installed to the first shell wall, the first extension extrudes the insulating sealing structure in the direction towards the first shell wall. Since the first gasket is arranged between the insulating sealing structure and the first extension, the first gasket can reduce a part of the force, thereby reducing the force conducted to the insulating sealing structure, and further reducing the damage to the insulating sealing structure, thereby achieving the effect of protecting the insulating sealing structure.

[0028] In some embodiments, the battery monomer comprises a second gasket, which is arranged between the insulating sealing structure and the side surface of the first shell wall facing the first extension, and the material hardness of the second gasket is less than that of the second portion.

[0029] In the above technical solution, when the pole extrudes the insulating sealing structure in the direction towards the first shell wall during the installation of the pole to the first shell wall, the insulating sealing structure can conduct the force to the second gasket. Since the material hardness of the second gasket is relatively small, the second gasket can be compressed and deformed to absorb the force, thereby reducing the reaction force fed back to the insulating sealing structure, and reducing the damage to the insulating sealing structure, thereby achieving the effect of protecting the insulating sealing structure.

[0030] In some embodiments, the pole post forms the first extension portion by a flange riveting.

[0031] In the above technical solution, the pole post is convenient to process, and the connection reliability of the first extension portion and the penetrating portion is improved, and the assembly reliability of the pole post and the first shell wall is improved.

[0032] In some embodiments, the penetrating portion and the first extension portion form a first pole post portion, and the insulation sealing structure comprises a first insulation sealing member fitted between the first pole post portion and the first shell wall, the first insulation sealing member being composed of a first portion and a second portion.

[0033] In the above technical solution, the first insulation sealing member can be simplified in structure, and the processing of the first insulation sealing member is facilitated.

[0034] In some embodiments, the pole post further comprises a second extension portion connected to the penetrating portion and extending in a direction away from the central axis of the mounting hole, the second extension portion and the first extension portion extending to the inner and outer sides of the first shell wall respectively, the penetrating portion and the second extension portion form a second pole post portion, and the insulation sealing structure comprises a second insulation sealing member fitted between the second pole post portion and the first shell wall and arranged separately from the first insulation sealing member.

[0035] In the above technical solution, since the pole post comprises the first extension portion and the second extension portion arranged on the inner and outer sides of the first shell wall, the cooperation between the pole post and the first shell wall is more stable and reliable, and since the insulation sealing structure comprises the first insulation sealing member and the second insulation sealing member arranged separately, the first insulation sealing member and the second insulation sealing member can be installed separately, the assembly difficulty is reduced, and the insulation sealing cooperation effect of the pole post and the first shell wall can be ensured.

[0036] In some embodiments, the pole post comprises a pole post body and a pole post cover plate, the pole post body comprises the first pole post portion and the second pole post portion, the first extension portion extends to the outside of the outer surface of the first shell wall, the pole post cover plate is arranged on the side of the first pole post portion away from the second pole post portion, and the pole post body and the pole post cover plate are welded and connected, and the material hardness of the second insulation sealing member is less than the material hardness of the second portion.

[0037] In the above technical solution, the material hardness of the second portion is greater than the material hardness of the second insulation sealing member, the second insulation sealing member is more easily compressed and deformed and has a better sealing effect, but the heat resistance of the second portion is stronger than the heat resistance of the second insulation sealing member, so that when the pole post body and the pole post cover plate are welded, the heat influence on the second insulation sealing member can be reduced as much as possible, and the sealing reliability between the first shell wall and the pole post is improved.

[0038] In some embodiments, the first extension portion protrudes from the penetrating portion towards the outside of the first shell wall to define a recess between the first extension portion and the penetrating portion, the edge of the pole cover plate is arranged in the recess, and the edge of the pole cover plate is penetration-welded with the penetrating portion, and the welding structure formed by the welding is spaced apart from the first extension portion.

[0039] In the above technical solution, the shrinkage stress generated by the solidification of the molten pool formed by the welding can be blocked by the spacing, and it is difficult or less to be conducted to the first extension portion, so that the warping problem of the first extension portion can be improved, and the first extension portion can press the insulation sealing structure to improve the insulation sealing effect. Moreover, since the edge of the pole cover plate is arranged in the recess and penetration-welded with the penetrating portion instead of being butt-welded with the first extension portion, it is not necessary to ensure that the assembly gap between the edge of the pole cover plate and the first extension portion is small in order to meet the butt-welding requirement, so that the spacing between the edge of the pole cover plate and the first extension portion can be larger, thereby improving the compatibility of the pole body and facilitating the reduction of the machining precision of the pole cover plate and the pole body.

[0040] In some embodiments, the battery monomer is formed with a receiving cavity on the inside of the first shell wall, the pole includes a pole body, the pole body is formed with a receiving slot open in a direction away from the receiving cavity, the pole body has a communication hole penetrating through a side wall of the receiving slot close to the receiving cavity, and the communication hole communicates the receiving cavity and the receiving slot.

[0041] In the above technical solution, when the electrolyte is injected into the battery monomer, the electrolyte can be injected into the receiving slot and then flow towards the receiving cavity through the communication hole. The receiving slot can function as a buffer for the electrolyte to improve the problems of spattering and overflowing of the electrolyte. Moreover, the side wall of the receiving slot can block the spattering of the electrolyte to some extent, reduce the pollution caused by the electrolyte to the outside, and facilitate the quick injection of the electrolyte. Moreover, since it is not necessary to separately open an injection passage on the shell, the shell does not need to be specially processed, which is conducive to reducing the structural complexity and processing difficulty of the shell.

[0042] In some embodiments, the battery monomer includes an electrode assembly, the electrode assembly includes an active material coated portion received in the receiving cavity, and a conductive portion connected with the active material coated portion, the conductive portion is penetrated through the communication hole to be at least partially received in the receiving slot.

[0043] In the above technical solution, by at least partially receiving the conductive portion in the receiving slot, the conductive portion occupies at least part of the space in the receiving slot, so that the space in the receiving cavity can be saved to receive a larger volume of active material coated portion, thereby facilitating the improvement of the energy density of the battery monomer, or in the case where the energy density of the battery monomer is unchanged, the size of the battery monomer can be reduced.

[0044] In some embodiments, the terminal post includes a terminal post cover plate covering the terminal post body, the terminal post cover plate having an injection hole that can communicate with a receiving groove, and the battery cell also includes a sealing structure for sealing the injection hole.

[0045] In the above technical solution, by machining the liquid injection hole on the electrode cover plate, the opening is relatively small and located on the outside, so that the liquid injection inlet can be reliably sealed through the sealing structure, thereby improving the working reliability of the battery cell and enabling flexible and diversified design of the sealing structure.

[0046] Secondly, embodiments of this application also provide a battery, including a battery cell of any of the above-described solutions.

[0047] In the above technical solution, the reliability of the battery cell according to the embodiment of this application is improved, which is beneficial to improving the performance of the battery.

[0048] Thirdly, embodiments of this application also provide an electrical device including a battery from any of the above-described solutions.

[0049] In the above technical solution, the improved battery performance is beneficial to enhancing the power consumption performance of the electrical device. Attached Figure Description

[0050] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0051] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0052] Figure 2 Exploded views of the battery structure provided in some embodiments of this application;

[0053] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0054] Figure 4 A schematic diagram of the orthographic projection of a single battery cell provided in some embodiments of this application;

[0055] Figure 5 For along Figure 4 Sectional view of line AA in the middle;

[0056] Figure 6 for Figure 5 A magnified view of part B, shown in the center circle;

[0057] Figure 7 Fig. 2 is a partial enlarged view of the C part shown in Fig. 1; Figure 6 Fig. 3 is a partial enlarged view of the C part shown in Fig. 1;

[0058] Figure 8 Fig. 4 is a partial sectional view of a battery cell provided for some embodiments of the present application;

[0059] Figure 9 Fig. 5 is a sectional view of an insulation sealing structure provided for some embodiments of the present application;

[0060] Figure 10 Fig. 6 is a partial sectional view of a battery cell provided for some embodiments of the present application;

[0061] Figure 11 Fig. 7 is a partial sectional view of a battery cell provided for some embodiments of the present application;

[0062] Figure 12 Fig. 8 is a partial sectional view of a battery cell provided for some embodiments of the present application;

[0063] Figure 13 Fig. 9 is a partial sectional view of a battery cell provided for some embodiments of the present application;

[0064] Figure 14 Fig. 10 is a schematic view of a battery cell cooperating with a busbar component provided for some embodiments of the present application.

[0065] The reference signs: vehicle 1000; first direction X; second direction Y; third direction Z; battery 100; controller 200; motor 300; box body 101; first box body 1011; second box body 1012; battery cell 102; busbar component 103; housing 1; accommodating cavity 11; mounting hole 12; central axis L; first housing wall 13; second corner 131; second housing wall 14; pole 2; pole body 3; sink 31; first extension 32; through part 33; first corner 34; first pole part 35; accommodating groove 36; communication hole 37; second extension 38; second pole part 39; pole cover plate 4; liquid injection hole 43; sealing structure 6; first sealing member 61; second sealing member 62; electrode group 7; active material coating part 71; conductive part 72; insulation sealing structure 8; third corner 81; fourth corner 82; first part 83; first subpart 831; first face part 8311; third face part 8312; second subpart 832; second part 84; second face part 841; fourth face part 842; first insulation sealing member 85; second insulation sealing member 86; third insulation sealing member 87; first gasket 91; second gasket 92. DETAILED DESCRIPTION

[0066] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0067] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0068] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments.

[0069] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0070] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0071] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, the detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0072] In this application, "multiple" means two or more (including two).

[0073] In this application, the battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0074] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned 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 housing for encapsulating one or more battery cells or one or more battery modules. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0075] A battery cell includes a casing, a cell assembly, and an electrolyte. The casing houses the cell assembly and the electrolyte. The cell assembly includes at least one electrode assembly, which consists of a positive electrode, a negative electrode, and a separator. The electrode assembly can be a wound structure or a stacked structure, etc. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates.

[0076] A positive electrode typically includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated onto the positive current collector. The positive current collector without a positive active material layer protrudes from the one with a positive active material layer, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the material of the positive active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0077] A negative electrode typically includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated onto the negative current collector. The negative current collector without a negative active material layer protrudes from the negative current collector with a negative active material layer, and the negative current collector without a negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the material of the negative active material layer can be carbon or silicon, etc.

[0078] To ensure that no fusing occurs when passing a large current, the number of positive electrode tabs is multiple and the positive electrode tabs are stacked together to form a tab portion of the positive electrode, and the number of negative electrode tabs is multiple and the negative electrode tabs are stacked together to form a tab portion of the negative electrode. The housing is provided with a post, and the tab portion of the positive electrode is electrically connected to the post of the positive electrode, and the tab portion of the negative electrode is electrically connected to the post of the negative electrode. For example, the tab portion can be connected to the post to form a direct electrical connection between the tab portion and the post. For another example, the battery cell assembly can include a jumper, the tab portion is connected to the jumper, and the jumper is connected to the post to form an indirect electrical connection between the tab portion and the post.

[0079] The material of the isolation film is not limited, for example, it can be polypropylene or polyethylene, etc.

[0080] Some battery cells in the related art install the post on the housing by riveting. In order to realize the insulation and sealing between the housing and the post, an insulating plastic is usually arranged between the post and the housing before riveting the post. However, when the post is riveted, the post will be deformed under force and will extrude the insulating plastic. The weak part of the insulating plastic is easy to crack under force. Once the insulating plastic cracks, the reliability of the insulation and sealing between the housing and the post will be affected, and the reliability of the battery cell will be reduced.

[0081] Therefore, an embodiment of the present application provides a battery cell, which comprises a housing, a post and an insulation and sealing structure. The housing comprises a first shell wall, and the first shell wall is provided with a mounting hole. The post comprises a penetrating portion penetrating the mounting hole, and a first extension portion connected with the penetrating portion and extending away from the center axis of the mounting hole. The first extension portion extends to the outside of the outer surface of the first shell wall or the inside of the inner surface of the first shell wall. The connection between the first extension portion and the penetrating portion is provided with a first corner facing the first shell wall. The first shell wall comprises a second corner corresponding to the first corner. The insulation and sealing structure is arranged between the first shell wall and the post, and comprises a first part and a second part. The material hardness of the first part is less than that of the second part. The first part is arranged close to at least one of the first corner and the second corner relative to the second part.

[0082] Therefore, when the pole is installed on the first shell wall, the pole will apply a force to the insulation sealing structure, the first shell wall will apply a counterforce to the insulation sealing structure, and the position corresponding to the first corner and / or the second corner of the insulation sealing structure is relatively large under stress, which is a weak position prone to cracking. By providing the insulation sealing structure to include a first part and a second part, the material hardness of the first part is less than that of the second part, and the first part is arranged closer to at least one of the first corner and the second corner relative to the second part, so that the insulation sealing structure adopts the first part with relatively soft material hardness at the weak position, the first part is relatively easy to compress and deform under stress relative to the second part, and absorbs the force, thereby reducing the risk of cracking of the insulation sealing structure at the weak position, and improving the reliability of the insulation sealing cooperation between the first shell wall and the pole, and improving the reliability of the battery monomer.

[0083] The embodiments of the present application provide a power consumption device using a battery as a power supply. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0084] The following embodiments take a power consumption device of an embodiment of the present application as an example for illustration.

[0085] Please refer to Figure 1 , Figure 1 The structure schematic diagram of the vehicle 1000 provided by some embodiments of the present application is shown. The vehicle 1000 can be a fuel car, a gas car, or a new energy car. The new energy car can be a pure electric car, a hybrid car, or a range extended car, etc. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300, the controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation and driving.

[0086] In some embodiments of the present application, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0087] Please refer to Figure 2 , Figure 2An exploded view of a battery 100 is provided for some embodiments of the present application. The battery 100 includes a box 101 and a plurality of battery cells 102, which are accommodated in the box 101. The box 101 is used to provide an assembly space for the battery cells 102, and the box 101 can adopt various structures. In some embodiments, the box 101 can include a first box body 1011 and a second box body 1012, the first box body 1011 and the second box body 1012 are mutually covered, and the first box body 1011 and the second box body 1012 jointly define an assembly space for accommodating the battery cells 102. The second box body 1012 can be a hollow structure with one end open, and the first box body 1011 can be a plate-shaped structure, which is covered on the open side of the second box body 1012 to jointly define the assembly space with the second box body 1012; the first box body 1011 and the second box body 1012 can also be hollow structures with one side open, and the open side of the first box body 1011 is covered on the open side of the second box body 1012. Of course, the box 101 formed by the first box body 1011 and the second box body 1012 can have various shapes, such as a cylinder, a cuboid, etc.

[0088] In the battery 100, the plurality of battery cells 102 can be connected in series, in parallel, or in a mixed manner, and the mixed manner means that the plurality of battery cells 102 are connected in series and in parallel. The plurality of battery cells 102 can be directly connected in series, in parallel, or in a mixed manner, and then the plurality of battery cells 102 are accommodated in the box 101 as a whole; of course, the battery 100 can also be that the plurality of battery cells 102 are connected in series, in parallel, or in a mixed manner to form a battery module, and then a plurality of battery modules are connected in series, in parallel, or in a mixed manner to form a whole, which is accommodated in the box 101. The battery 100 can also include other structures, for example, the battery 100 can also include a current collecting component for realizing the electrical connection between the plurality of battery cells 102.

[0089] Each battery cell 102 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 102 can be a cylinder, a flat body, a cuboid, etc. For example, referring to the embodiment shown in Figure 3 The length direction of the battery cell 102 is the first direction X, the width direction of the battery cell 102 is the second direction Y, and the height direction of the battery cell 102 is the third direction Z, and the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0090] In some embodiments of the present application, the battery 100 can be used in combination with Figures 3-6The battery monomer 102 comprises a shell 1 and a pole 2, the pole 2 is arranged on the shell 1, and an accommodating cavity 11 is formed in the shell 1. The battery monomer 102 comprises an electrode assembly 7, which can comprise an active material coating part 71 and a conductive part 72 connected to the active material coating part 71. The active material coating part 71 is accommodated in the accommodating cavity 11, and the conductive part 72 is welded to the pole 2, so that the conductive part 72 is electrically connected between the active material coating part 71 and the pole 2.

[0091] In combination Figure 5 and Figure 6 The shell 1 comprises a first shell wall 13, the first shell wall 13 has a mounting hole 12, and the pole 2 passes through the mounting hole 12 to be mounted on the first shell wall 13. The pole 2 comprises a passing part 33 and a first extension part 32. The passing part 33 passes through the mounting hole 12, that is, at least part of the passing part 33 is located in the mounting hole 12. The axial direction of the mounting hole 12 is taken as the projection direction, and the surface perpendicular to the axial direction of the mounting hole 12 is taken as the projection surface. The projection of the passing part 33 on the projection surface falls within the projection range of the mounting hole 12 on the projection surface, so that the passing part 33 can pass through the mounting hole 12.

[0092] In combination Figure 5 and Figure 6 The first extension part 32 is connected to the passing part 33 and extends away from the center axis L of the mounting hole 12 relative to the passing part 33. The first extension part 32 extends to the outside of the outer surface of the first shell wall 13 or the inside of the inner surface of the first shell wall 13. The two side surfaces of the first shell wall 13 in the thickness direction are respectively the outer surface and the inner surface. The inner surface is the side surface of the first shell wall 13 facing the accommodating cavity 11, and the outer surface is the side surface of the first shell wall 13 away from the accommodating cavity 11. The side of the outer surface 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 part 32 extending to the outside of the outer surface of the first shell wall 13 or the inside of the inner surface of the first shell wall 13" means that at least part of the first extension part 32 is opposite to the first shell wall 13. The axial direction of the mounting hole 12 is taken as the projection direction, and the surface perpendicular to the axial direction of the mounting hole 12 is taken as the projection surface. The projection of the first extension part 32 on the projection surface has an intersection area with the projection of the first shell wall 13 on the projection surface. The part of the first extension part 32 corresponding to the intersection area is opposite to the first shell wall 13.

[0093] In combination Figure 5 and Figure 6 The battery monomer 102 further comprises an insulating sealing structure 8 fitted between the first shell wall 13 and the pole 2. That is, at least part of the insulating sealing structure 8 is clamped between the first shell wall 13 and the pole 2, so that the pole 2 and the first shell wall 13 are indirectly fitted through the insulating sealing structure 8, thereby realizing the insulation and sealing between the first shell wall 13 and the pole 2.

[0094] As shown in Figure 6 and Figure 7 The connection between the first extension 32 and the penetrating portion 33 has a first corner 34 arranged towards the first shell wall 13, that is, the side of the connection between the first extension 32 and the penetrating portion 33 close to the first shell wall 13 is formed as the first corner 34, and the first shell wall 13 includes a second corner 131 arranged corresponding to the first corner 34, that is, the corner of the first shell wall 13 close to the first corner 34 is the second corner 131. The insulation sealing structure 8 includes a first part 83 and a second part 84, the material hardness of the first part 83 is less than that of the second part 84, and the first part 83 is arranged close to at least one of the first corner 34 and the second corner 131 relative to the second part 84. That is, the first part 83 can be arranged close to the first corner 34 relative to the second part 84, or the first part 83 can be arranged close to the second corner 131 relative to the second part 84, or part of the first part 83 is arranged close to the first corner 34 relative to the second part 84, and the other part of the first part 83 is arranged close to the second corner 131 relative to the second part 84.

[0095] In the embodiment of the present application, when the pole 2 is installed to the first shell wall 13, the pole 2 will apply a force to the insulation sealing structure 8 fitted between the pole 2 and the first shell wall 13, and the position corresponding to the first corner 34 and / or the second corner 131 of the insulation sealing structure 8 is relatively large under stress, which is a weak position prone to cracking. By arranging the insulation sealing structure 8 to include the first part 83 and the second part 84, the material hardness of the first part 83 is less than that of the second part 84, and the first part 83 is arranged close to at least one of the first corner 34 and the second corner 131 relative to the second part 84, so that the insulation sealing structure 8 adopts the first part 83 with relatively soft material hardness at the weak position, and the first part 83 is prone to compressive deformation under stress relative to the second part 84, thereby absorbing the force, reducing the risk of cracking of the insulation sealing structure 8 at the weak position, thereby facilitating to improve the reliability of the insulation sealing cooperation between the first shell wall 13 and the pole 2, and improving the reliability of the battery monomer 102. Moreover, by arranging the second part 84 with relatively hard material hardness relative to the first part 83, the second part 84 can support the compression amount of the insulation sealing structure 8 to be better controlled to achieve a relatively effective sealing effect, thereby improving the cooperation sealing between the pole 2 and the first shell wall 13.

[0096] It is worth noting that the materials of the first part 83 and the second part 84 are not limited and can be selected according to actual requirements. For example, the material of the first part 83 can be selected from compressible rubber materials or plastic materials such as PFA (perfluoroalkyl), PP (polypropylene), FKM (fluorine rubber), EPDM (ethylene propylene diene rubber), and the like, so that the first part 83 has good compression deformation performance to effectively improve the cracking problem. For example, the material of the second part 84 can be selected from high-hardness insulating materials such as PPS (polyphenylene sulfide, a new type of high-performance thermoplastic resin) and LCP (liquid crystal polymer), so that the second part 84 has good hardness and plays a supporting role, so that the compression amount of the insulating sealing structure 8 can be well controlled to improve the sealing performance.

[0097] It is worth noting that the specific structure of the insulating sealing structure 8 is not limited and can be one piece or can be combined by multiple pieces. For example, in combination with Figure 7 , the insulating sealing structure 8 can include a first insulating sealing piece 85 and a second insulating sealing piece 86. The first part 83 and the second part 84 can constitute the first insulating sealing piece 85. The second insulating sealing piece 86 is disposed on the inner and outer sides of the first shell wall 13 with the first insulating sealing piece 85. The material hardness of the second insulating sealing piece 86 is less than that of the second part 84 to have good compression deformation sealing performance. For example, the second insulating sealing piece 86 can be a rubber piece. When the second part 84 has a good supporting role, the compression amount of the second insulating sealing piece 86 in the insulating sealing structure 8 can be well controlled to improve the sealing effect.

[0098] In some embodiments of the present application, as shown in Figure 7 , the insulating sealing structure 8 includes a third corner 81 corresponding to the first corner 34. The first part 83 includes a first sub-part 831 disposed close to the third corner 81 relative to the second part 84. The material hardness of the first sub-part 831 is less than that of the second part 84. In this way, since the insulating sealing structure 8 includes the third corner 81 corresponding to the first corner 34, when the first shell wall 13 is assembled and fixed with the pole 2, the pole 2 will extrude the insulating sealing structure 8. The stress on the insulating sealing structure 8 at the position of the third corner 81 is relatively large and is prone to cracking. By arranging the first sub-part 831 with a material hardness relatively softer than that of the second part 84, the first sub-part 831 is prone to compression deformation under stress to absorb the stress, thereby reducing the risk of cracking of the insulating sealing structure 8 from the third corner 81.

[0099] In some embodiments of the present application, as shown in Figure 8As shown, the insulation sealing structure 8 includes a fourth corner 82 corresponding to the second corner 131, and the first part 83 includes a second sub-part 832 arranged close to the fourth corner 82 relative to the second part 84, and the material hardness of the second sub-part 832 is less than that of the second part 84. In this way, since the insulation sealing structure 8 includes the fourth corner 82 corresponding to the second corner 131, when the pole 2 is assembled and fixed to the first shell wall 13, the pole 2 will extrude the insulation sealing structure 8, the insulation sealing structure 8 will extrude the first shell wall 13, the first shell wall 13 will apply a counterforce to the insulation sealing structure 8, and the counterforce applied to the fourth corner 82 of the insulation sealing structure 8 by the second corner 131 of the first shell wall 13 is relatively large, and the insulation sealing structure 8 is prone to cracking at the fourth corner 82. By arranging the second sub-part 832 with a material hardness relatively soft relative to the second part 84, the second sub-part 832 is prone to compression deformation under stress, and the stress is absorbed, so as to reduce the risk of cracking of the insulation sealing structure 8 from the fourth corner 82.

[0100] It should be noted that the first part 83 can also simultaneously include the first sub-part 831 and the second sub-part 832, so as to more comprehensively reduce the cracking risk of the insulation sealing structure 8 at the weak position and improve the structural reliability of the insulation sealing structure 8. In addition, it should be noted that the material of the first sub-part 831 and the second sub-part 832 can be the same or different, and can be specifically set according to actual conditions.

[0101] In some embodiments of the present application, as shown in Figure 7 and Figure 8 The pole 2 forms the first extension 32 through flange riveting. That is, after the pole 2 is assembled to the mounting hole 12 through the penetrating part 33, the first extension 32 is made by using the flange riveting process. In this way, the pole 2 is convenient to process, and is conducive to improving the connection reliability of the first extension 32 and the penetrating part 33 and improving the assembly reliability of the pole 2 and the first shell wall 13.

[0102] As shown in Figure 7 When the pole 2 processes the first extension 32 by using the riveting process, the pole 2 will extrude the insulation sealing structure 8, so that the stress of the insulation sealing structure 8 at the third corner 81 is relatively large, and the insulation sealing structure 8 is prone to cracking at this position. When the first part 83 includes the first sub-part 831 arranged close to the third corner 81 relative to the second part 84, the risk of cracking of the insulation sealing structure 8 at the third corner 81, i.e., the position corresponding to the first corner 34, can be reduced.

[0103] As shown in Figure 8As shown, when the pole 2 is processed by riveting to form the first extension 32, the pole 2 will extrude the insulation sealing structure 8, the insulation sealing structure 8 extrudes the first shell wall 13, the first shell wall 13 will apply a counterforce to the insulation sealing structure 8, so that the force applied to the insulation sealing structure 8 at the fourth corner 82 is relatively large, which has a risk of cracking. When the first part 83 includes the second sub-part 832 arranged close to the fourth corner 82 relative to the second part 84, the risk of cracking of the insulation sealing structure 8 at the fourth corner 82, i.e., the position corresponding to the second corner 131, can be reduced.

[0104] Of course, the present application is not limited thereto, for example, in other embodiments of the present application, the pole 2 can also be formed by welding two parts together, for example, assembling the two parts to the mounting hole 12 respectively, and then welding the two parts together. It can be understood that when the pole 2 is assembled to the first shell wall 13 by other means than riveting, the phenomenon of extruding the insulation sealing structure 8 will also exist. By using the first part 83 and the second part 84 made of different materials, the first part 83 is arranged close to the position of relative weakness and easy cracking relative to the second part 84, which can improve the cracking problem of the insulation sealing structure 8 and improve the reliability of the insulation sealing structure 8.

[0105] In some embodiments, as Figure 7 As shown, when the first part 83 includes the first sub-part 831 arranged close to the third corner 81 relative to the second part 84, the first sub-part 831 can define a partial outer surface of the third corner 81. For example, the first sub-part 831 can define a part of the side surface of the insulation sealing structure 8 facing the first extension 32, and / or define a part of the side surface of the insulation sealing structure 8 facing the through part 33. In this way, the first sub-part 831 is exposed to the outer surface of the insulation sealing structure 8 at a position close to the first corner 34, so that better stress compression deformation can occur, which is beneficial to the buffering effect and improves the cracking problem at this position. Moreover, such an arrangement can also reduce the processing difficulty of combining the first sub-part 831 with the second part 84.

[0106] Exemplarily, as Figure 7 As shown, the side surface of the insulation sealing structure 8 facing the first extension 32 includes the first surface part 8311 defined by the first sub-part 831, and the side surface of the insulation sealing structure 8 facing the first extension 32 also includes the second surface part 841 defined by the second part 84, the first surface part 8311 is flush with the second surface part 841, i.e., the first surface part 8311 is adjacent to the second surface part 841 and coplanar with the second surface part 841, or in combination Figure 9The first surface portion 8311 is protruded from the second surface portion 841, i.e. the first surface portion 8311 is adjacent to the second surface portion 841 and a part of the first surface portion 8311 is protruded from a side of the second surface portion 841 close to the first extending portion 32.

[0107] Therefore, since the side surface of the insulation sealing structure 8 facing the first extending portion 32 includes the first surface portion 8311 defined by the first sub-portion 831, the compression force from the first extending portion 32 can be better buffered, and the cracking problem of the third corner 81 caused by the compression force from the first extending portion 32 can be effectively improved. Moreover, since the side surface of the insulation sealing structure 8 facing the first extending portion 32 includes the second surface portion 841 defined by the second portion 84, the second surface portion 841 can be used to support along the axial direction of the mounting hole 12, so that the compression amount of the insulation sealing structure 8 can be better controlled to achieve a more effective sealing effect, thereby improving the sealing performance between the pole 2 and the first shell wall 13. Furthermore, since the first surface portion 8311 is not recessed below the second surface portion 841, when the pole 2 presses the third corner 81 of the insulation sealing structure 8, the first surface portion 8311 can not be affected by the second surface portion 841 and timely buffer the compression force to protect the third corner 81 of the insulation sealing structure 8 and improve the cracking problem at this position. Moreover, since the first surface portion 8311 is protruded from or flush with the second surface portion 841, the flexibility of the processing and design of the insulation sealing structure 8 can be improved.

[0108] In some embodiments of the present application, as shown in Figure 7 the width W of the second surface portion 841 in the wall thickness direction of the penetrating portion 33 can be greater than or equal to 0.5 mm, so that the width dimension of the second surface portion 841 is sufficient to better support along the axial direction of the mounting hole 12, so that the compression amount of the insulation sealing structure 8 can be better controlled to achieve a more effective sealing effect.

[0109] After the insulation sealing structure 8 is assembled, the first sub-portion 831 will be deformed by compression, for example, the axial thickness Y1 of the first sub-portion 831 will become smaller, and the radial width X1 can become larger or smaller. Regardless of whether the first surface portion 8311 is protruded from the second surface portion 841 or whether the third surface portion 8312 is protruded from the fourth surface portion 842, before the insulation sealing structure 8 is assembled, the radial width X1 and the axial thickness Y1 of the first sub-portion 831 are combined Figure 9 , and after the insulation sealing structure 8 is assembled, the insulation sealing structure 8 is pressed by the pole 2 and the first shell wall 13, the radial width of the first sub-portion 831 becomes X2, and the axial thickness becomes Y2.

[0110] Exemplarily, 0.01 * X1≤ X2≤ 200% * X1, 10% * Y1≤ Y2≤ 100% * Y1. Thus, the deformation range of the first sub-portion 831 is larger, which can effectively buffer the extrusion force, so as to better protect the insulation sealing structure 8.

[0111] Exemplarily, Y1 is greater than or equal to 0.5 mm, so that the axial thickness of the first sub-portion 831 is sufficient, so as to better buffer the extrusion force from the first extending portion 32, and effectively improve the cracking problem of the third corner 81 caused by the extrusion force from the side of the first extending portion 32.

[0112] It is worth noting that when the insulation sealing structure 8 is configured such that the first face portion 8311 exceeds the second face portion 841, it can refer to the state before the insulation sealing structure 8 is assembled. After the insulation sealing structure 8 is assembled, the relationship between the first face portion 8311 and the second face portion 841 can change, for example, the first face portion 8311 can be extruded to be flush with the second face portion 841, or the first face portion 8311 still exceeds the second face portion 841, etc.

[0113] In some embodiments, in combination with Figure 9 When the first face portion 8311 exceeds the second face portion 841, the size E of the first face portion 8311 exceeding the second face portion 841 can be 0 mm-1 mm. Thus, on the one hand, the size E of the first face portion 8311 exceeding the second face portion 841 is not too small, so that the first face portion 8311 can be effectively compressed, improving the cracking problem of the third corner 81. On the other hand, the size E of the first face portion 8311 exceeding the second face portion 841 is not too large, so that after the first face portion 8311 is compressed, the second face portion 841 can effectively support in the axial direction, so that the compression amount of the insulation sealing structure 8 can be better controlled, and the sealing effect can be better.

[0114] In some embodiments, in combination with Figure 9 When the third face portion 8312 exceeds the fourth face portion 842, the size F of the third face portion 8312 exceeding the fourth face portion 842 can be 0 mm-3 mm. Thus, on the one hand, the size F of the third face portion 8312 exceeding the fourth face portion 842 is not too small, so that the third face portion 8312 can be effectively compressed, improving the cracking problem of the third corner 81. On the other hand, when the first face portion 8311 is compressed, the third face portion 8312 will be more protruding from the fourth face portion 842. By setting the size F of the third face portion 8312 exceeding the fourth face portion 842 not to be too large, the problem of stress cracking caused by excessive extrusion of the third face portion 8312 from the penetrating portion 33 can be avoided.

[0115] Of course, the present application is not limited thereto, for example, in some other embodiments of the present application, the side surface of the insulation sealing structure 8 facing the first extending portion 32 can also be defined entirely by the second portion 84, or entirely by the first sub-portion 831, etc.

[0116] Exemplarily, as shown in Figure 7 the side surface of the insulation sealing structure 8 facing the penetrating portion 33 includes a third face portion 8312 defined by the first sub-portion 831, and further includes a fourth face portion 842 defined by the fourth portion, the third face portion 8312 is flush with the fourth face portion 842, i.e., the third face portion 8312 is adjacent to the fourth face portion 842 and they are coplanar, or in combination Figure 9 , the third face portion 8312 exceeds the fourth face portion 842, i.e., the third face portion 8312 is adjacent to the fourth face portion 842 and a part of the third face portion 8312 protrudes on the side of the fourth face portion 842 close to the penetrating portion 33.

[0117] It is worth mentioning that when the insulation sealing structure 8 is configured such that the third face portion 8312 exceeds the fourth face portion 842, it can be the state before assembly, after assembly, the relationship between the third face portion 8312 and the fourth face portion 842 can change, for example, the third face portion 8312 can be pressed to be flush with the fourth face portion 842, or the third face portion 8312 still exceeds the fourth face portion 842, etc.

[0118] Therefore, since the first sub-portion 831 defines the third face portion 8312 in the side surface of the insulation sealing structure 8 facing the penetrating portion 33, the extrusion force from the penetrating portion 33 can be better buffered, and the cracking problem of the third corner 81 caused by the extrusion force from the penetrating portion 33 can be more effectively improved. Moreover, since the third face portion 8312 is not recessed below the fourth face portion 842, when the pole 2 extrudes the third corner 81 position of the insulation sealing structure 8, the third face portion 8312 can not be affected by the fourth face portion 842, and timely play a buffering role, protect the third corner 81 position of the insulation sealing structure 8, and improve the cracking problem at this position. Furthermore, since the third face portion 8312 exceeds or is flush with the fourth face portion 842, the flexibility of processing and design of the insulation sealing structure 8 can be improved.

[0119] Of course, the present application is not limited thereto, for example, in some other embodiments of the present application, the side surface of the insulation sealing structure 8 facing the penetrating portion 33 can also be defined entirely by the second portion 84, or entirely by the first sub-portion 831, etc.

[0120] In some embodiments, the first sub-portion 831 defines a first surface portion 8311 in a side surface of the insulation sealing structure 8 facing the first extending portion 32 and a third surface portion 8312 in a side surface of the insulation sealing structure 8 facing the penetrating portion 33, the first surface portion 8311 and the second surface portion 841 meet each other, for example, the second portion 84 can be provided with a first notch corresponding to a position of the first corner 34, and the first sub-portion 831 fills the first notch, thereby facilitating the processing of the insulation sealing structure 8, and facilitating the protection of the third corner 81 by the first sub-portion 831, and improving the cracking problem of the third corner 81.

[0121] In some embodiments, as shown in Figure 8 When the first portion 83 includes a second sub-portion 832 arranged close to the fourth corner 82 relative to the second portion 84, the second sub-portion 832 can define a partial outer surface of the fourth corner 82. Thus, the second sub-portion 832 is exposed to the outer surface of the insulation sealing structure 8 close to the second corner 131, thereby better facilitating the compression deformation under stress, and improving the cracking problem under the buffering effect. Moreover, such an arrangement can also reduce the processing difficulty of combining the first sub-portion 831 with the second portion 84.

[0122] In some embodiments, the penetrating portion 33 and the insulation sealing structure 8 have a fitting gap therebetween, so that the penetrating portion 33 is not easily directly pressed to the insulation sealing structure 8, thereby reducing the stress transmitted to the insulation sealing structure 8, reducing the damage to the insulation sealing structure 8, and achieving the effect of protecting the insulation sealing structure 8.

[0123] It is worth noting that when the insulation sealing structure 8 is formed as an annular structure surrounding the center axis L of the mounting hole 12, and the first sub-portion 831 can be configured as an annular structure extending along the entire circumference of the insulation sealing structure 8, thereby facilitating processing and having a comprehensive anti-cracking effect, or it can also be configured as a discontinuous structure arranged at intervals along the circumference of the insulation sealing structure 8, thereby facilitating material saving and cost reduction.

[0124] Similarly, when the insulation sealing structure 8 is formed as an annular structure surrounding the center axis L of the mounting hole 12, and the second sub-portion 832 can be configured as an annular structure extending along the entire circumference of the insulation sealing structure 8, thereby facilitating processing and having a comprehensive anti-cracking effect, or it can also be configured as a discontinuous structure arranged at intervals along the circumference of the insulation sealing structure 8, thereby facilitating material saving and cost reduction.

[0125] In some embodiments of the present application, as Figure 10As shown, the battery cell 102 comprises a first gasket 91, which is arranged between the first extension 32 and the insulating sealing structure 8. In this way, when the first extension 32 presses the insulating sealing structure 8 in the direction of the first shell wall 13 (for example, presses the insulating sealing structure 8 in the axial direction of the mounting hole 12), since the first gasket 91 is arranged between the insulating sealing structure 8 and the first extension 32, the first gasket 91 can reduce a part of the force, thereby reducing the force transmitted to the insulating sealing structure 8, and further reducing the damage to the insulating sealing structure 8, thereby achieving the effect of protecting the insulating sealing structure 8.

[0126] It should be noted that the material hardness of the first gasket 91 and the material hardness of the insulating sealing structure 8 are not limited in size. For example, the material hardness of the first gasket 91 can be greater than the material hardness of the second part 84, so that the first gasket 91 can better attenuate the pressing force transmitted to the insulating sealing structure 8, and more effectively improve the cracking problem of the insulating sealing structure 8. For example, the second part 84 can be a plastic part, and the first gasket 91 can be a metal part, so that the material hardness of the first gasket 91 can be greater than the material hardness of the second part 84. For example, the first gasket 91 can be made of steel such as SUS304, SUS316, SPCC, etc., or made of aluminum such as Al 1060, etc.

[0127] For example, when the first gasket 91 is arranged, only the second sub-portion 832 can be arranged without the first sub-portion 831, so that the cracking problem of the third corner 81 and the fourth corner 82 of the insulating sealing structure 8 can be better improved, and the structure of the insulating sealing structure 8 can be simplified. However, the present application is not limited thereto, and when the first gasket 91 is arranged, the first sub-portion 831 and the second sub-portion 832 can be arranged at the same time, so as to more fully improve the cracking problem of the third corner 81 and the fourth corner 82 of the insulating sealing structure 8.

[0128] In some embodiments of the present application, as shown in Figure 11 The battery cell 102 comprises a second gasket 92, which is arranged between the insulating sealing structure 8 and the side surface of the first shell wall 13 facing the first extension 32, and the material hardness of the second gasket 92 is less than the material hardness of the second part 84. For example, when the first extension 32 extends to the outside of the outer surface of the first shell wall 13, the second gasket 92 is arranged between the first extension 32 and the outer surface of the first shell wall 13, and for another example, when the first extension 32 extends to the inside of the inner surface of the first shell wall 13, the second gasket 92 is arranged between the first extension 32 and the inner surface of the first shell wall 13.

[0129] Thus, when the pole 2 is installed to the first shell wall 13, when the pole 2 extrudes the insulation sealing structure 8 in the direction of the first shell wall 13 (for example, extrudes the insulation sealing structure 8 along the axial direction of the installation hole 12), the insulation sealing structure 8 can conduct the force to the second gasket 92, since the material hardness of the second gasket 92 is relatively small, the second gasket 92 can be compressed and deformed to absorb the force, thereby the reaction force fed back to the insulation sealing structure 8 can be reduced, the damage to the insulation sealing structure 8 can be reduced, and the insulation sealing structure 8 can be protected.

[0130] Exemplarily, when the second gasket 92 is arranged, only the first sub-portion 831 can be arranged, and the second sub-portion 832 is not arranged, in this way, the cracking problem of the third corner 81 and the fourth corner 82 of the insulation sealing structure 8 can be better improved, and the structure of the insulation sealing structure 8 can be simplified. However, the application is not limited to this, when the second gasket 92 is arranged, the first sub-portion 831 and the second sub-portion 832 can be arranged at the same time, so as to more fully improve the cracking problem of the third corner 81 and the fourth corner 82 of the insulation sealing structure 8.

[0131] In some embodiments of the application, as shown in Figure 11 That is to say, only the second corner 131 can be formed as a chamfered corner (such as a rounded corner or a beveled corner), and the fourth corner 82 can be formed as a non-chamfered corner, such as a right angle, an acute angle or an obtuse angle; or only the fourth corner 82 can be formed as a chamfered corner, and the second corner 131 can be formed as a non-chamfered corner, such as a right angle, an acute angle or an obtuse angle; or both the second corner 131 and the fourth corner 82 can be formed as chamfered corners.

[0132] When the pole 2 is assembled and fixed to the first shell wall 13, the second corner 131 is easy to extrude the fourth corner 82, and the insulation sealing structure 8 cracks from the position of the fourth corner 82. If the second corner 131 is arranged in a chamfered form, the area of the second corner 131 exerting force to the fourth corner 82 can be increased, the force exerting position is dispersed, and thus the risk of the insulation sealing structure 8 cracking from the position of the fourth corner 82 is reduced; if the fourth corner 82 is arranged in a chamfered form, when the second corner 131 exerts force to the fourth corner 82, the force receiving area of the fourth corner 82 can be increased, the force receiving position of the fourth corner 82 is dispersed, and thus the risk of the insulation sealing structure 8 cracking from the position of the fourth corner 82 is reduced. Thus, by forming at least one of the second corner 131 and the fourth corner 82 as a chamfered corner, the risk of the insulation sealing structure 8 cracking from the position of the fourth corner 82 can be reduced.

[0133] In some embodiments of the present application, whether at least one of the second corner 131 and the fourth corner 82 is processed into a chamfered form, a fitting gap can be provided between the second corner 131 and the fourth corner 82, so that the extrusion of the second corner 131 to the fourth corner 82 can be reduced to a certain extent, thereby reducing the risk of cracking of the insulating sealing structure 8 from the position of the fourth corner 82.

[0134] In some embodiments of the present application, as shown in Figure 11 The insulating sealing structure 8 includes a third corner 81 corresponding to the first corner 34, and at least one of the first corner 34 and the third corner 81 is formed into a chamfer (such as a rounded chamfer or an inclined chamfer). That is, only the first corner 34 can be formed into a chamfer, and the third corner 81 can be formed into a non-chamfer, such as a right angle, an acute angle or an obtuse angle; or only the third corner 81 can be formed into a chamfer, and the first corner 34 can be formed into a non-chamfer, such as a right angle, an acute angle or an obtuse angle; or both the first corner 34 and the third corner 81 can be formed into a chamfer.

[0135] When the first shell wall 13 is assembled and fixed with the pole 2, the first corner 34 is easy to extrude the third corner 81, so that the insulating sealing structure 8 cracks from the position of the third corner 81. If the first corner 34 is provided in a chamfered form, the area of the first corner 34 exerting force to the third corner 81 can be increased, so that the force position is dispersed, thereby reducing the risk of cracking of the insulating sealing structure 8 from the position of the third corner 81. If the third corner 81 is provided in a chamfered form, the force area of the third corner 81 can be increased when the first corner 34 exerts force to the third corner 81, so that the force position of the third corner 81 is dispersed, thereby reducing the risk of cracking of the insulating sealing structure 8 from the position of the third corner 81. Therefore, by forming at least one of the first corner 34 and the third corner 81 into a chamfer, the risk of cracking of the insulating sealing structure 8 from the position of the third corner 81 can be reduced.

[0136] In some embodiments of the present application, whether at least one of the first corner 34 and the third corner 81 is processed into a chamfered form, a fitting gap can be provided between the first corner 34 and the third corner 81, so that the extrusion of the first corner 34 to the third corner 81 can be reduced to a certain extent, thereby reducing the risk of cracking of the insulating sealing structure 8 from the position of the third corner 81.

[0137] It is worth noting that whether the first sub-portion 831 is provided at the third corner 81 or not, the third corner 81 can be processed into a chamfered form, and whether the second sub-portion 832 is provided at the fourth corner 82 or not, the fourth corner 82 can be processed into a chamfered form. In addition, the setting of the chamfer and the setting of the gasket can be considered together or alternatively, which is not limited here.

[0138] In some embodiments of the present application, as shown in Figure 6 The first extension 32 and the through portion 33 constitute a first pole portion 35, and the insulation sealing structure 8 comprises a first insulation sealing member 85 fitted between the first pole portion 35 and the first shell wall 13, the first insulation sealing member 85 being composed of a first part 83 and a second part 84. In this way, the first insulation sealing member 85 can be simplified in structure, and the processing of the first insulation sealing member 85 is facilitated.

[0139] Further, as shown in Figure 6 The pole 2 further comprises a second extension 38 connected with the through portion 33 and extending in a direction away from the central axis L of the mounting hole 12 relative to the through portion 33, the second extension 38 and the first extension 32 extending to the inner and outer sides of the first shell wall 13 respectively, for example, the first extension 32 extends to the outer side of the first shell wall 13, and the second extension 38 extends to the inner side of the first shell wall 13, and if the first extension 32 extends to the inner side of the first shell wall 13, the second extension 38 extends to the outer side of the first shell wall 13. The through portion 33 and the second extension 38 constitute a second pole portion 39, and the insulation sealing structure 8 comprises a second insulation sealing member 86 fitted between the second pole portion 39 and the first shell wall 13, the second insulation sealing member 86 being separately provided from the first insulation sealing member 85. It can be understood that the first pole portion 35 and the second pole portion 39 share the through portion 33.

[0140] In this way, since the pole 2 comprises the first extension 32 and the second extension 38 arranged on the inner and outer sides of the first shell wall 13 respectively, the cooperation between the pole 2 and the first shell wall 13 is more stable and reliable, and since the insulation sealing structure 8 comprises the first insulation sealing member 85 and the second insulation sealing member 86 separately provided, the first insulation sealing member 85 and the second insulation sealing member 86 can be respectively and independently installed, the assembly difficulty is reduced, and the insulation sealing cooperation effect of the pole 2 and the first shell wall 13 can be ensured.

[0141] In addition, in some embodiments, in combination with Figure 6The insulating sealing structure 8 can further include a third insulating sealing member 87, which can be arranged between the second extending portion 38 and the shell 1 and abut against the active material coated portion 71 of the electrode core assembly 7, so as to not only improve the insulation between the electrode core assembly 7 and the shell 1, but also improve the stability of the cooperation between the electrode core assembly 7 and the shell 1, thereby improving the reliability of the battery monomer 102. Alternatively, the third insulating sealing member 87 can be cancelled, and an insulating support (not shown in the figure) is sleeved on the end of the active material coated portion 71, which abuts against the inner surface of the shell 1, so as to facilitate the protection of the electrode core assembly 7 during the installation of the electrode core assembly 7 to the shell 1, avoid scratching between the shell 1 and the electrode core assembly 7, and improve the insulation between the electrode core assembly 7 and the shell 1, while improving the stability of the cooperation between the electrode core assembly 7 and the shell 1, thereby improving the reliability of the battery monomer 102.

[0142] In some embodiments of the present application, as shown in Figure 6 the pole post 2 includes a pole post body 3 and a pole post cover plate 4, the pole post body 3 includes a first pole post portion 35 and a second pole post portion 39, the first extending portion 32 extends to the outside of the outer surface of the first shell wall 13, the pole post cover plate 4 is sleeved on the side of the first pole post portion 35 away from the second pole post portion 39, and the pole post body 3 and the pole post cover plate 4 are welded and connected, and the material hardness of the second insulating sealing member 86 is less than the material hardness of the second portion 84.

[0143] Therefore, the material hardness of the second portion 84 is greater than the material hardness of the second insulating sealing member 86, the second insulating sealing member 86 is more easily compressed and deformed and has better sealing effect relative to the second portion 84, but the heat resistance of the second portion 84 is stronger than the heat resistance of the second insulating sealing member 86, for example, the second portion 84 is a plastic member and the second insulating sealing member 86 is a rubber member, so that when the pole post body 3 and the pole post cover plate 4 are welded, the heat influence on the second insulating sealing member 86 can be reduced as much as possible, thereby improving the sealing reliability between the first shell wall 13 and the pole post 2.

[0144] In some embodiments of the present application, as shown in Figure 12 the first extending portion 32 protrudes from the penetrating portion 33 towards the outside of the first shell wall 13 to define a sunken groove 31 between the first extending portion 32 and the penetrating portion 33, the edge of the pole post cover plate 4 is arranged in the sunken groove 31 and is penetrated and welded with the penetrating portion 33, and the welding structure formed by welding is spaced apart from the first extending portion 32.

[0145] Therefore, the shrinkage stress generated by the solidification of the molten pool formed by the welding can be blocked by the above-mentioned gap, and it is difficult or less to be conducted to the first extension part 32, so that the warping problem of the first extension part 32 can be improved, so that the first extension part 32 can press the insulating sealing structure 8, and the insulating sealing effect is improved. Moreover, since the edge of the pole cover plate 4 is arranged in the sink groove 31 and is penetrated and welded with the penetrating part 33, instead of being butt welded with the first extension part 32, so that it is not necessary to ensure that the assembly gap between the edge of the pole cover plate 4 and the first extension part 32 is small in order to meet the butt welding requirement, so that the gap between the edge of the pole cover plate 4 and the first extension part 32 can be larger, so that the compatibility of the pole body 3 is improved, and the machining precision of the pole cover plate 4 and the pole body 3 is reduced.

[0146] In some embodiments of the present application, as shown in Figure 12 The battery cell 102 is formed with a receiving cavity 11 on the inner side of the first shell wall 13, and the pole 2 comprises a pole body 3, the pole body 3 is formed with a receiving groove 36 which is open in the direction away from the receiving cavity 11, and the pole body 3 is provided with a communication hole 37 which penetrates through the side groove wall of the receiving groove 36 close to the receiving cavity 11 and communicates the receiving cavity 11 and the receiving groove 36. For example, when the penetrating part 33 is annular, the receiving groove 36 is located in the inner annular region of the penetrating part 33, and for example, the receiving groove 36 can be jointly defined by the penetrating part 33 and the support part located in the inner annular region of the penetrating part 33, and the communication hole 37 penetrates through the support part.

[0147] Therefore, when the electrolyte is injected into the battery cell 102, the electrolyte can be injected into the receiving groove 36, and then flow towards the receiving cavity 11 through the communication hole 37, wherein the receiving groove 36 can play a role in buffering the electrolyte, so as to improve the problems such as spatter and overflow of the electrolyte. Moreover, the side wall of the receiving groove 36 (i.e. the groove wall extending from the groove opening of the receiving groove 36 towards the receiving cavity 11) can block the spatter of the electrolyte to a certain extent, reduce the pollution caused by the electrolyte to the outside, and facilitate the rapid injection. Moreover, since it is not necessary to separately open an injection channel on the shell 1, so that special processing of the shell 1 is not necessary, which is beneficial to reduce the structural complexity and processing difficulty of the shell 1.

[0148] Exemplarily, as shown in Figure 12 The sink groove 31 is open on the side towards the center axis L of the mounting hole 12 to communicate with the receiving groove 36. Therefore, the compactness of the cooperation between the pole body 3 and the pole cover plate 4 can be improved, and the structure and processing of the pole cover plate 4 are simplified.

[0149] In some embodiments of the present application, as shown in Figure 12As shown, the battery cell 102 comprises a cell assembly 7, which comprises an active material coated portion 71 received in the accommodating cavity 11, and a conductive portion 72 connected with the active material coated portion 71, the conductive portion 72 is penetrated in the communication hole 37 to be at least partially received in the accommodating groove 36.

[0150] It is worth mentioning that the communication hole 37 can be one or more, and the conductive portion 72 can be penetrated in at least one of the communication holes 37. For example, at least one of the communication holes 37 can pass through the electrolyte, for example, at least one of the communication holes 37 is empty (i.e. not penetrated by the conductive portion 72), so that the electrolyte can pass through without being hindered by the conductive portion 72, and for another example, at least one of the communication holes 37 can still pass through the electrolyte after the conductive portion 72 is penetrated.

[0151] Therefore, by receiving at least part of the conductive portion 72 in the accommodating groove 36, at least part of the conductive portion 72 occupies the space in the accommodating groove 36, so that the space occupied by the conductive portion 72 in the accommodating cavity 11 can be reduced, the space in the accommodating cavity 11 can be saved to receive a larger volume of the active material coated portion 71, so as to facilitate to improve the energy density of the battery cell 102, or in the case that the energy density of the battery cell 102 is unchanged, it is beneficial to reduce the size of the battery cell 102.

[0152] It can be understood that the active material coated portion 71 can comprise a current collector coated with an active material layer, and the conductive portion 72 can only comprise a tab portion, or can also comprise a tab portion and a transition sheet electrically connected with the tab portion, etc., which is not limited here.

[0153] In some embodiments, the conductive portion 72 is welded with the pole body 3 to form an electrical connection, so as to realize the electrode output of the cell assembly 7 from the pole body 3. For example, as shown in Figure 12 The conductive portion 72 is welded with the side groove wall of the accommodating groove 36 close to the accommodating cavity 11, so as to improve the compactness of the fit and facilitate the welding operation of the two. Of course, the present application is not limited thereto, and in other embodiments, the conductive portion 72 can also be arranged to be welded with the pole cover plate 4 to form an electrical connection, which is not limited here.

[0154] In some embodiments, as shown in Figure 13As shown, the terminal post 2 includes a terminal post cover plate 4 covering the terminal post body 3. The terminal post cover plate 4 has an injection hole 43 that communicates with the receiving cavity 36. The battery cell 102 also includes a sealing structure 6 for sealing the injection hole 43. Thus, when electrolyte needs to be injected into the battery cell 102, the sealing structure 6 is not installed at the injection hole 43, or the sealing structure 6 is in an open state, allowing electrolyte to be injected into the receiving cavity 36 through the injection hole 43. Furthermore, after injection, the sealing structure 6 can be installed at the injection hole 43, or the sealing structure 6 can be switched to a closed state, thereby sealing and closing the injection hole 43 to prevent electrolyte overflow and to prevent external foreign objects from entering the receiving cavity 11 from the injection hole 43, thereby improving the reliability of the battery cell 102.

[0155] Therefore, by machining the liquid injection hole 43 on the terminal cover plate 4, the opening is relatively small and located on the outside, and the liquid injection inlet can be reliably sealed by the sealing structure 6, thereby improving the working reliability of the battery cell 102. Moreover, the sealing structure 6 can be designed in a flexible and diverse manner.

[0156] In some embodiments, such as Figure 13 As shown, the electrode cap 4 does not have a portion that stops the sealing structure 6 on the outside (i.e., the side away from the receiving cavity 11), so that the sealing structure 6 is suitable for installation onto the electrode cap 4 from the outside (i.e., the side away from the receiving cavity 11). Thus, by configuring the sealing structure 6 to be installed onto the electrode cap 4 from the outside to seal the injection hole 43, the sealing structure 6 can be installed after injection, ensuring the sealing of the injection hole 43. Furthermore, the installation position is close to the outside, facilitating quick assembly of the sealing structure 6. Moreover, the installation of the sealing structure 6 does not adversely affect the connection between the electrode body 3 and the electrode cap 4, ensuring the reliability of the connection between the electrode cap 4 and the electrode body 3.

[0157] The sealing structure 6 can be either detachable or fixed. For example, when the sealing structure 6 is detachable, it facilitates the maintenance of the injection port 43. For instance, when electrolyte needs to be added, the sealing structure 6 can be removed, the injection port 43 can be opened, and electrolyte can be injected into the receiving cavity 11 through the injection port 43. Afterward, the sealing structure 6 can be reinstalled. For example, the sealing structure 6 can be detachably connected to the electrode cover plate 4 by means of threads or screws, thus facilitating disassembly and assembly.

[0158] Exemplarily, when the sealing structure 6 is in a non-detachable fixed form, the sealing structure 6 can be fixed to the pole cover plate 4 in a manner of welding, riveting or the like, so as to improve the sealing reliability of the sealing structure 6 to the liquid injection hole 43. For example, the liquid injection hole 43 can be in a multi-segment form, and the sealing structure 6 can include a first sealing member 61 in interference fit with the liquid injection hole 43, and a second sealing member 62 covering the first sealing member 61 and welded with the pole cover plate 4.

[0159] Alternatively, in some embodiments, the second sealing member 62 can be arranged to be detachably connected with the pole cover plate 4 in a manner of screwing, so as to limit the first sealing member 61 in the position in interference fit with the liquid injection hole 43.

[0160] In some embodiments of the present application, as shown in Figure 13 at least part of the sealing structure 6 is embedded in the liquid injection hole 43. That is, the sealing structure 6 can be entirely embedded in the liquid injection hole 43, and the sealing structure 6 can also have only part embedded in the liquid injection hole 43. In this way, on the one hand, the space in the liquid injection hole 43 can be fully utilized, and the sealing reliability of the sealing structure 6 to the liquid injection hole 43 can be improved. On the other hand, the height of the sealing structure 6 protruding out of the liquid injection hole 43 can be reduced, and the space outside the pole cover plate 4 can be occupied by the sealing structure 6, which is conducive to reducing the interference with the current collecting component 103, increasing the connection area of the current collecting component 103 with the pole cover plate 4, and improving the current passing efficiency.

[0161] In some embodiments of the present application, as shown in Figure 13 the first shell wall 13 is an integrally formed cover plate, or, as shown in Figure 12 the shell 1 further includes a second shell wall 14, and the first shell wall 13 is integrally formed with at least one second shell wall 14, and the second shell wall 14 extends towards one side of the first shell wall 13 in the thickness direction. In this way, the flexible design of the structure position of the pole 2 can be realized, thereby increasing the application range of the battery monomer 102 of the present application.

[0162] It is worth noting that the second shell wall 14 can extend from the edge of the first shell wall 13. When the first shell wall 13 is rectangular, at least one of the four edges of the first shell wall 13 can extend the second shell wall 14. For example, only one edge of the first shell wall 13 can extend the second shell wall 14, and the first shell wall 13 can also have two edges respectively extending the second shell wall 14, and the first shell wall 13 can also have three edges respectively extending the second shell wall 14, and the first shell wall 13 can also have all four edges extending the second shell wall 14. Exemplarily, when the shell 1 is a rectangular shell, any wall surface of the rectangular shell can be used as the first shell wall 13.

[0163] For example, the shell 1 can include a shell body and a cover plate, the shell body defines a space with one side open, and the cover plate is arranged at the open side of the shell body to form a containing cavity 11 between the shell body and the cover plate, at this time, the side surface opposite to the cover plate of the shell body is the first shell wall 13, the wall surface of the shell body connected between the first shell wall 13 and the cover plate is the second shell wall 14, or the side surface opposite to the cover plate of the shell body is the second shell wall 14, the wall surface of the shell body connected between the second shell wall 14 and the cover plate is the first shell wall 13, or the cover plate is the first shell wall 13.

[0164] According to the second aspect embodiment of the present application, the battery 100 according to the embodiment of the present application can include a box body or can not include a box body. Thus, since the reliability of the battery monomer 102 according to the embodiment of the present application is improved, the performance of the battery 100 is improved.

[0165] Exemplarily, as shown in Figure 14 The battery 100 can further include a busbar component 103, and the battery monomers 102 are multiple and at least two of which are electrically connected through the busbar component 103. Thus, the series connection and / or parallel connection of multiple battery monomers 102 can be realized. For example, when multiple battery monomers 102 are connected in series, the pole cover plate 4 of the anode of one battery monomer 102 and the pole cover plate 4 of the cathode of the next battery monomer 102 are connected through one busbar component 103, and the pole cover plate 4 of the cathode of the battery monomer 102 and the pole cover plate 4 of the anode of the previous battery monomer 102 are connected through another busbar component 103.

[0166] According to the third aspect embodiment of the present application, the battery 100 according to the embodiment of the present application can be used to provide power for the power utilization device. The power utilization device can be any of the devices or systems described above. Since the performance of the battery 100 is improved, the working power performance of the power utilization device is improved.

[0167] Next, the battery monomer 102 according to one specific embodiment of the present application is described.

[0168] The battery cell 102 comprises a housing 1, a pole 2 and an insulation sealing structure 8. The housing 1 comprises a first shell wall 13, the first shell wall 13 having a mounting hole 12 formed thereon, the pole 2 comprises a penetrating portion 33 penetrating the mounting hole 12, a first extension portion 32 connected with the penetrating portion 33 and extending away from the center axis L of the mounting hole 12, and a second extension portion 38 connected with the penetrating portion 33 and extending away from the center axis L of the mounting hole 12, the first extension portion 32 extending to the outside of the first shell wall 13, and the second extension portion 38 extending to the inside of the first shell wall 13, the first extension portion 32 being formed by flanging riveting.

[0169] The penetrating portion 33 and the first extension portion 32 form a first pole portion 35, the insulation sealing structure 8 comprises a first insulation sealing member 85 fitted between the first pole portion 35 and the first shell wall 13, the penetrating portion 33 and the second extension portion 38 form a second pole portion 39, and the insulation sealing structure 8 comprises a second insulation sealing member 86 fitted between the second pole portion 39 and the first shell wall 13 and separate from the first insulation sealing member 85.

[0170] The connection between the first extension portion 32 and the penetrating portion 33 has a first corner 34 arranged towards the first shell wall 13, the first shell wall 13 comprises a second corner 131 corresponding to the first corner 34, the first insulation sealing member 85 comprises a third corner 81 corresponding to the first corner 34 and a fourth corner 82 corresponding to the second corner 131.

[0171] The first insulation sealing member 85 is formed as an integral piece and comprises a first portion 83 and a second portion 84, the first portion 83 comprises a first sub-portion 831 arranged close to the third corner 81 relative to the second portion 84 and / or a second sub-portion 832 arranged close to the fourth corner 82 relative to the second portion 84, and the material hardness of the first portion 83 is less than that of the second portion 84.

[0172] In the assembling process, the first insulation sealing member 85, the second insulation sealing member 86 and the pole 2 can be installed at the installation hole 12 of the first shell wall 13 first, and then the first extension 32 is processed by riveting. At this time, the pole 2 will apply a force to the first insulation sealing member 85, and the first shell wall 13 will apply a counterforce to the first insulation sealing member 85. The positions of the first insulation sealing member 85 corresponding to the first corner 34 and / or the second corner 131 are relatively concentrated in stress, which are weak positions prone to cracking. By using a material with relatively soft hardness at the third corner 81 and / or the fourth corner 82 of the first insulation sealing member 85, the material is prone to compression deformation under stress, thereby absorbing the force, reducing the risk of cracking of the first insulation sealing member 85 at the weak position, thereby facilitating to improve the reliability of the insulation sealing cooperation between the first shell wall 13 and the pole 2, and improving the reliability of the battery monomer 102. Moreover, by using a material with relatively hard hardness at the positions of the third corner 81 and the fourth corner 82 of the first insulation sealing structure 8, the material can support the compression amount of the second insulation sealing member 86 to be better controlled, so as to achieve a relatively effective sealing effect, thereby improving the cooperation sealing performance between the pole 2 and the first shell wall 13.

[0173] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0174] The above is only the preferred embodiment of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that, include: A first shell wall, having mounting holes; The pole post includes a through portion passing through the mounting hole, and a first extension portion connected to the through portion and extending relative to the through portion in a direction away from the central axis of the mounting hole. The first extension portion extends to the outer side of the outer surface or the inner side of the inner surface of the first shell wall. The connection between the first extension portion and the through portion has a first corner facing the first shell wall. The first shell wall includes a second corner corresponding to the first corner. An insulating and sealing structure is fitted between the first shell wall and the pole post, and includes a first part and a second part. The material hardness of the first part is less than that of the second part. The first part is positioned relative to the second part near at least one of the first corner and the second corner. The insulating sealing structure includes a third corner corresponding to the first corner, and the first part includes a first sub-part disposed relative to the second part and close to the third corner; The insulating sealing structure includes a first face defined by the first sub-part on one side surface facing the first extension, and the insulating sealing structure also includes a second face defined by the second part, wherein the first face extends beyond or is flush with the second face. The insulating sealing structure includes a third face defined by the first sub-part on one side surface facing the through portion, and the insulating sealing structure also includes a fourth face defined by the second portion on one side surface facing the through portion, the third face extending beyond or flush with the fourth face.

2. The battery cell according to claim 1, characterized in that, The first sub-part defines a portion of the outer surface of the third corner.

3. The battery cell according to any one of claims 1-2, characterized in that, The insulating sealing structure includes a fourth corner corresponding to the second corner, and the first part includes a second sub-part located near the fourth corner relative to the second part.

4. The battery cell according to claim 3, characterized in that, The second sub-part defines a portion of the outer surface of the fourth corner.

5. The battery cell according to claim 1, characterized in that, There is a fitting gap between the through-hole and the insulating sealing structure.

6. The battery cell according to claim 1, characterized in that, Both the second part and the first part are annular structures that extend around the entire circumference of the mounting hole.

7. The battery cell according to claim 1, characterized in that, The insulating sealing structure includes a third corner corresponding to the first corner, at least one of the first corner and the third corner being formed as a chamfer, and / or there is a fitting gap between the first corner and the third corner.

8. The battery cell according to claim 1, characterized in that, The insulating sealing structure includes a fourth corner corresponding to the second corner, at least one of the second corner and the fourth corner being formed as a chamfer, and / or there is a fitting gap between the second corner and the fourth corner.

9. The battery cell according to claim 1, characterized in that, The battery cell includes a first gasket, which is disposed between the first extension and the insulating sealing structure.

10. The battery cell according to claim 1, characterized in that, The battery cell includes a second gasket, which is disposed between the insulating sealing structure and the surface of the first shell wall facing the first extension, and the material hardness of the second gasket is less than that of the second portion.

11. The battery cell according to claim 1, characterized in that, The pole post is formed into the first extension by flanging and riveting.

12. The battery cell according to claim 1, characterized in that, The through portion and the first extension portion form a first pole portion, and the insulating sealing structure includes a first insulating sealing member that fits between the first pole portion and the first shell wall. The first insulating sealing member is composed of a first part and a second part.

13. The battery cell according to claim 12, characterized in that, The pole post further includes a second extension that is connected to the through portion and extends in a direction away from the central axis of the mounting hole relative to the through portion. The second extension and the first extension extend to the inner and outer sides of the first shell wall, respectively. The through portion and the second extension form a second pole post portion. The insulating sealing structure includes a second insulating sealing element that is fitted between the second pole post portion and the first shell wall and is separately disposed from the first insulating sealing element.

14. The battery cell according to claim 13, characterized in that, 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 outer side of the outer surface of the first shell wall. The pole cover plate covers the side of the first pole portion away from the second pole portion. The pole body and the pole cover plate are welded together. The material hardness of the second insulating seal is less than the material hardness of the second portion.

15. The battery cell according to claim 14, characterized in that, The first extension protrudes outward from the through portion toward the outside of the first shell wall to define a groove between the first extension and the through portion. The edge of the pole cover plate is disposed in the groove and is welded through to the through portion. The welded structure formed by the welding is spaced apart from the first extension.

16. The battery cell according to claim 1, characterized in that, The battery cell has a receiving cavity formed on the inner side of the first shell wall. The terminal post includes a terminal post body, and a receiving groove is formed on the terminal post body in a direction that opens away from the receiving cavity. The terminal post body has a connecting hole, which penetrates the groove wall of the receiving groove near the receiving cavity and connects the receiving cavity and the receiving groove.

17. The battery cell according to claim 16, characterized in that, The battery cell includes a cell assembly, which includes an active material coating portion housed in the receiving cavity and a conductive portion connected to the active material coating portion. The conductive portion passes through the connecting hole to be at least partially housed in the receiving groove.

18. The battery cell according to any one of claims 16-17, characterized in that, The terminal post includes a terminal post cover plate covering the terminal post body, and an injection hole is formed on the terminal post cover plate that can communicate with the receiving groove. The battery cell also includes a sealing structure for sealing the injection hole.

19. A battery, characterized in that, Includes the battery cell according to any one of claims 1-18.

20. An electrical appliance, characterized in that, Includes the battery according to claim 19.

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