Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and a power utilization device, and relates to the technical field of batteries. The battery monomer comprises a shell and a pole part, the shell comprises a shell body and a shell cover, at least one end of the shell body in a first direction is an open end, the shell cover is arranged on the open end, the shell cover is provided with a mounting hole, the pole part is arranged at the mounting hole and comprises a pole body and a switching structure, the pole body is electrically connected with an electrode assembly accommodated in the shell, and the switching structure surrounds the pole body and is insulatedly connected with the pole body; the switching structure and the shell cover are connected to form a first welding mark, the shell cover and the shell body are connected to form a second welding mark, and the shell cover comprises a solid part which is spaced between the first welding mark and the second welding mark. In the technical scheme, since the shell cover comprises the solid part which is spaced between the first welding mark and the second welding mark, the mutual thermal influence between the first welding mark and the second welding mark can be reduced, the connection strength of the switching structure and the shell cover and the connection strength of the shell cover and the shell body are improved, and the reliability of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and power supply 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. Utility Model Content

[0003] This application provides a battery cell, a battery device, and an electrical device, which helps to improve the reliability of the battery cell.

[0004] In a first aspect, embodiments of this application provide a battery cell, which includes a housing and a terminal component. The housing includes a body and a cover. At least one end of the body in a first direction is an open end, and the cover is disposed on the open end. The cover has a mounting hole. The terminal component is disposed at the mounting hole and includes a terminal body and a connecting structure. The terminal body is electrically connected to an electrode assembly housed in the housing. The connecting structure surrounds the terminal body and is insulated from the terminal body. The connecting structure is connected to the cover to form a first solder mark, and the cover is connected to the body to form a second solder mark. The cover includes a solid portion spaced between the first solder mark and the second solder mark.

[0005] In the above technical solution, since the cover includes a solid portion spaced between the first solder mark and the second solder mark, the mutual thermal influence between the first solder mark and the second solder mark can be reduced, the connection strength between the adapter structure and the cover and the connection strength between the cover and the body can be improved, and the reliability of the battery cell can be increased.

[0006] In some embodiments, the spacing W1 between the first solder mark and the second solder mark is greater than or equal to 3 mm.

[0007] In the above technical solution, the spacing between the first solder mark and the second solder mark will not be too small, thereby further reducing the mutual thermal influence between the first solder mark and the second solder mark, further improving the connection strength between the adapter structure and the cover, as well as the connection strength between the cover and the body, and further improving the reliability of the battery cell.

[0008] In some embodiments, the cover is a rectangular cover, the pole piece is formed as a long strip structure consistent with the length direction of the cover, and the distance W11 between the first solder mark and the second solder mark in the width direction of the cover is less than or equal to 1 / 8 of the width W of the cover.

[0009] In the above technical solution, the gap between the first solder mark and the second solder mark will not be too large, which means that the size of the pole component in the width direction of the shell is relatively large. This is beneficial to increasing the conductive area of ​​the pole body in the pole component, thereby increasing the conductive area between the pole body and the electrode assembly, as well as the conductive area between the pole body and the plate. On the other hand, it is beneficial to increase the size of the connection and mating position between the pole body and the adapter structure, thereby increasing the connection reliability between the pole body and the adapter structure.

[0010] In some embodiments, the cover is a rectangular cover, and the pole member is formed as an elongated strip structure aligned with the length direction of the cover, wherein the width W0 of the pole member is greater than or equal to 3 / 4 of the width W of the cover.

[0011] In the above technical solution, the electrode component has a relatively large dimension in the width direction of the shell cover. This is beneficial in two ways: firstly, it allows for a larger conductive area of ​​the electrode body in the electrode component, thereby increasing the conductive area between the electrode body and the electrode assembly, as well as the conductive area between the electrode body and the electrode plate; secondly, it allows for a larger dimension of the connection and mating position between the electrode body and the adapter structure, thereby increasing the reliability of the connection between the electrode body and the adapter structure.

[0012] In some embodiments, the cover includes a body portion and a stepped portion, the stepped portion protruding from the body portion toward a direction close to the pole member, and the edge of the transition structure having a first overlapping portion protruding toward the cover, the first overlapping portion overlapping the side of the stepped portion away from the interior of the housing, and the transition structure participating in the formation of a first solder mark at least through the first overlapping portion.

[0013] In the above technical solution, by setting the first overlapping part to overlap on the side of the step portion away from the inside of the shell, that is, the first overlapping part overlaps on the outside of the step portion, the pole post component can be covered on the shell cover along the direction from the outside to the inside, which facilitates the assembly of the pole post component to the shell cover. Moreover, when welding the transition structure and the shell cover, due to the overlapping and cooperation of the first overlapping part and the step portion, the pole post component and the shell cover can be reliably positioned, and the cooperation between the two is more stable during the welding process, thereby improving the welding quality of the two.

[0014] In some embodiments, the cover extends into the body to space between the transition structure and the body, and the distance W2 between the first overlap and the body is greater than or equal to 4 mm.

[0015] In the above technical solution, there is sufficient space between the first overlapping part and the shell body to set the shell cover, so that the size of the shell cover between the first overlapping part and the shell body is sufficient, so that the gap between the first solder mark and the second solder mark is not too small, thereby further reducing the mutual thermal influence between the first solder mark and the second solder mark, further improving the connection strength between the adapter structure and the shell cover, as well as the connection strength between the shell cover and the shell body, and further improving the reliability of the battery cell.

[0016] In some embodiments, a first chamfer is formed at the intersection of the outer peripheral surface of the cover facing the body and the inner end surface of the cover, and a second chamfer is formed at the intersection of the inner peripheral surface of the cover facing the first overlapping portion and the outer end surface of the cover. The minimum distance W3 between the first chamfer and the second chamfer in a direction perpendicular to the wall thickness direction of the cover is greater than or equal to 4 mm.

[0017] In the above technical solution, the cover has sufficient dimensions between the first overlapping portion and the body to ensure that the gap between the first and second solder marks is not too small. This further reduces the mutual thermal influence between the first and second solder marks, improves the connection strength between the adapter structure and the cover, and the connection strength between the cover and the body, and further enhances the reliability of the battery cell. Furthermore, the first chamfer facilitates the cover's insertion into the body, and the second chamfer facilitates accurate positioning during welding of the adapter structure and the cover, improving the welding quality between the adapter structure and the cover.

[0018] In some embodiments, the overlap dimension W4 of the first overlap portion extending onto the step portion in the direction from the transition structure to the cover is greater than or equal to 0.3 mm.

[0019] In the above technical solution, the first overlapping part and the step part have a certain overlapping width, which improves the reliability of overlapping positioning and avoids the problem that the first overlapping part will detach from the support of the step part due to shaking or insufficient processing accuracy.

[0020] In some embodiments, the first solder mark extends along the direction from the first overlap to the step.

[0021] In the above technical solution, since the molten pool of the solder mark extends from the outside to the inside, it facilitates the welding operation and simplifies the production of battery cells.

[0022] In some embodiments, the thickness H3 of the first overlap in the first direction is greater than or equal to 0.3 mm.

[0023] In the above technical solution, the thickness of the first overlapping part in the first direction is not too small, which can avoid the first overlapping part being too thin and deformed, affecting the reliability and stability of the overlapping. It can also avoid the problem of poor welding between the transition structure and the shell due to insufficient welding penetration caused by the first overlapping part being too thin, thereby improving the connection reliability between the pole component and the shell.

[0024] In some embodiments, the cover includes a second overlap portion that protrudes from the body portion toward a direction away from the pole member. The second overlap portion overlaps the axial side of the open end of the body, and the cover participates in forming the second solder mark at least through the second overlap portion.

[0025] In the above technical solution, by setting a second overlapping part to overlap the shaft end of the shell body, it is convenient to position the shell cover and the shell body during assembly. When welding the shell cover and the shell body, due to the overlapping fit of the second overlapping part and the shell body, the fit between the shell cover and the shell body is more stable during the welding process, thereby improving the welding quality of the two.

[0026] In some embodiments, the second solder mark extends along the direction from the housing to the pole member.

[0027] In the above technical solution, the shell cover and the shell body are connected by side welding, which can increase the distance between the first weld mark and the second weld mark to a certain extent, thereby reducing the heat impact.

[0028] In some embodiments, the side surface of the adapter structure away from the interior of the housing in the first direction is a first end face, the side surface of the adapter structure near the interior of the housing in the first direction is a second end face, the side surface of the cover away from the interior of the housing in the first direction is the outer end face of the cover, the first solder mark extends from the first end face to the second end face, and the first end face is located in the first direction on the side near the interior of the housing of the plane containing the outer end face of the cover.

[0029] In the above technical solution, since the first end face is located on the side of the plane where the outer end face of the cover is located in the first direction, which is closer to the inside of the cover, it means that the first end face does not protrude or warp relative to the outer end face of the cover towards the outside of the cover. There is no warping step caused by spot welding, which avoids welding defects caused by full welding at the warping step. This can improve the welding quality between the transition structure and the cover, thereby improving the connection reliability between the pole component and the cover.

[0030] In some embodiments, the ratio of the height difference H1 between the first end face and the outer end face of the cover in the first direction to the thickness H2 of the cover in the first direction is 1 / 26-1 / 13; and / or, the height difference H1 between the first end face and the outer end face of the cover in the first direction is 0.05mm-0.15mm.

[0031] In the above technical solution, the height difference between the first end face and the outer end face of the shell in the first direction is not too small, which allows for a larger space for the transition structure to be raised, thereby better avoiding the raised step caused by spot welding, improving the welding quality between the transition structure and the shell, and thus improving the connection reliability between the pole component and the shell. Moreover, the height difference between the first end face and the outer end face of the shell in the first direction is not too large, so the transition structure does not need to be thinned too much, and the shell does not need to be thickened too much, which helps to ensure the penetration depth and low cost.

[0032] In some embodiments, the thickness H2 of the cover in the first direction is 1.5mm-3mm.

[0033] In the above technical solution, the shell cover is not too thin, which can better ensure the rigidity of the shell cover, improve the load-bearing capacity of the pole component, and help ensure the welding penetration depth. In addition, the shell cover is not too thick, which helps to reduce costs.

[0034] In some embodiments, the cover is a rectangular cover, the ratio of the length L1 to the width W of the cover is greater than or equal to 10, and the thickness H2 of the cover in the first direction is 3 mm.

[0035] In the above technical solution, when the cover is relatively slender, the thickness of the cover is set to be relatively large to improve the rigidity of the cover and avoid deformation problems caused by excessive deflection of the cover.

[0036] In some embodiments, the cover is a rectangular cover, the ratio of the length L1 to the width W of the cover is less than 10, and the thickness H2 of the cover in the first direction is 2 mm.

[0037] In the above technical solution, when the cover is not so slender, the cover deflection is relatively small, and the cover thickness does not need to be set too thick to avoid the problem of cover deformation, thereby helping to reduce the cost of the cover.

[0038] In some embodiments, the pole component includes a seal that is sealed between the pole body and the adapter structure.

[0039] In the above technical solution, by setting a sealing element, the pole component itself has sealing capability. When connecting the pole component and the housing cover, there is no need to consider the sealing problem, which can reduce the sealing pressure that the housing bears when connecting with the pole component, thereby helping to protect the housing.

[0040] In some embodiments, the electrode post body passes through the adapter structure and includes an inner clamping portion and an outer clamping portion. The outer clamping portion is clamped on the side of the adapter structure away from the inside of the housing, and the inner clamping portion is clamped on the side of the adapter structure closer to the inside of the housing. A seal is clamped between the inner clamping portion and the adapter structure. The electrode post component also includes a first insulating member, which is clamped between the outer clamping portion and the adapter structure.

[0041] In the above technical solution, by clamping the adapter structure with the electrode body, the seal can be sealed from the side close to the inside of the housing, which can more effectively prevent electrolyte leakage from the mating position between the electrode body and the adapter structure and improve reliability.

[0042] In some embodiments, the adapter structure defines a through hole, and the pole body includes a first part and a second part. The first part is an integral piece and includes a through portion and an inner clamping portion. The second part is an integral piece and includes an outer clamping portion. The through portion passes through the through hole. One end of the through portion near the inside of the housing is connected to the inner clamping portion, and the other end of the through portion away from the inside of the housing is connected to the outer clamping portion to form a third weld mark. A seal is disposed at the through hole and surrounds the through portion to clamp between the edge of the adapter structure near the through hole and the inner clamping portion. The third weld mark is disposed relative to the central axis of the seal near the through portion.

[0043] In the above technical solution, by setting the pole body as described above and arranging the relative positions of the third weld and the sealing element, the sealing element can be reliably clamped after the first and second parts are welded. The rebound force of the sealing element is unlikely to cause the welded positions of the first and second parts to separate or loosen, thus improving the sealing reliability. Furthermore, the welded positions of the first and second parts are on the outer side, facilitating welding operations and ensuring welding quality.

[0044] In some embodiments, the side surface of the adapter structure away from the interior of the housing in the first direction is a first end face, and the side surface of the adapter structure near the interior of the housing in the first direction is a second end face. The first solder mark extends from the first end face to the second end face. The first insulating member includes a first spacer portion clamped between the outer clamping portion and the adapter structure, and an outer covering portion covering the outer peripheral surface of the outer clamping portion. The distance W5 between the outer covering portion and the edge of the first end face is greater than or equal to 2 mm.

[0045] In the above technical solution, the insulation protection range of the first insulating component is large, which is conducive to improving the reliability of the battery cell. Furthermore, by leaving some distance between the outer casing and the edge of the first end face, a protective cover can be set to protect the outer casing. This reduces the risk of damage to the first insulating component caused by welding heat when welding the transition structure and the shell cover, thus protecting the first insulating component.

[0046] In some embodiments, a groove is formed on the first end face, and a first insulating member is embedded in the groove. The distance W6 between the edge of the groove and the edge of the first end face is greater than or equal to 2 mm.

[0047] In the above technical solution, the fit stability of the first insulating component can be improved by setting a groove, and by setting the distance between the edge of the groove and the edge of the first end face to be greater than or equal to, it indicates that there is sufficient space outside the groove at the edge position of the transition structure to set a protective cover to protect the outer casing, thereby facilitating the protection of the first insulating component.

[0048] In some embodiments, the distance W5 between the outer portion and the edge of the first end face is less than or equal to 1 / 8 of the width W of the cover.

[0049] In the above technical solution, the outer part can be closer to the edge of the first end face to reserve a larger space so that the outer clamping part can have a larger size, which is conducive to increasing the connection area between the outer clamping part and the plate and improving the conductivity efficiency.

[0050] In some embodiments, the pole member further includes a second insulating member mounted on the adapter structure and located on the side of the adapter structure near the interior of the housing and surrounding the seal. The second insulating member includes a second spacer and an extension. The second spacer is spaced between the inner clamping portion and the adapter structure. The extension extends from the second spacer toward the housing and is located outside the coverage area of ​​the inner clamping portion but within the coverage area of ​​the adapter structure.

[0051] In the above technical solution, the inner side of the electrode component has a larger insulation area, which can eliminate or reduce the insulation support as needed, simplifying the structure of the battery cell.

[0052] In some embodiments, the side surface of the adapter structure near the inside of the housing in the first direction is the second end face, and the distance W7 between the extension and the edge of the second end face is greater than or equal to 2 mm.

[0053] In the above technical solution, at the edge of the adapter structure, there can be sufficient space outside the extension to install the helium detection rubber nozzle, so that the helium detection rubber nozzle can be installed stably and reliably, thereby improving the reliability of helium detection.

[0054] Secondly, embodiments of this application also provide a battery device, including a battery cell of any of the above-described solutions.

[0055] 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 device.

[0056] Thirdly, embodiments of this application also provide an electrical device, including a battery device according to any of the above-described solutions.

[0057] In the above technical solution, the improved performance of the battery device is beneficial to improving the power consumption performance of the electrical device. Attached Figure Description

[0058] 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.

[0059] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0060] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0061] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0062] Figure 4 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0063] Figure 5 Partial cross-sectional views of a battery cell provided for other embodiments of this application;

[0064] Figure 6 for Figure 5 The enlarged view of point A shown in the image.

[0065] Figure label:

[0066] 1000 vehicles;

[0067] Battery device 100; controller 200; motor 300;

[0068] Box body 101; First box section 1011; Second box section 1012; Box bottom plate 1013;

[0069] Battery cell 102; First direction F1; Second direction F2; Third direction F3;

[0070] Casing 1;

[0071] Shell 11; Open end 111;

[0072] Shell cover 12; outer peripheral surface 12a; inner end surface 12b; first chamfer 12c;

[0073] Inner circumferential surface 12d; outer end surface 12e; second chamfer 12f;

[0074] Mounting hole 121; Solid part 122;

[0075] Body part 123; Stepped part 124; Second overlapping part 125;

[0076] pole piece 2;

[0077] pole body 21; first part 21a; second part 21b;

[0078] Inner clamping part 211; outer clamping part 212; through part 213; central axis L;

[0079] Adapter structure 22; First overlapping part 221; Perforation 222; Countersunk groove 223;

[0080] First end face 22a; Second end face 22b;

[0081] Seal 23;

[0082] Insulating component 24; First insulating component 241; First spacer portion 2411; Outer casing portion 2412;

[0083] Second insulating member 242; Second spacer 2421; Extension 2422;

[0084] Electrode assembly 3; tab portion 31; active material coating portion 32;

[0085] First weld mark 4; second weld mark 5; third weld mark 6. Detailed Implementation

[0086] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0087] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0088] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0089] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to direct connection or indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0090] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0091] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0092] In this application, "multiple" means two or more, including two.

[0093] 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, magnesium-ion batteries, or solid-state batteries, etc., and the embodiments of this application are not limited thereto. The battery cell may be cylindrical, cuboid, or other shapes, etc., and the embodiments of this application are not limited thereto.

[0094] The battery device 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. Exemplarily, the battery device may include a housing for encapsulating one or more battery cells, or one or more battery modules, the housing preventing liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0095] A single battery cell includes a casing, electrode components, and an electrolyte (which may be a solid electrolyte layer located between the positive and negative electrodes in a solid-state battery). The electrode components include at least one electrode assembly, and both the electrode assembly and the electrolyte are housed within the casing. The electrode assembly includes a positive electrode, a negative electrode, and a separator (this structure can be omitted in solid-state batteries). The battery cell primarily functions by the movement of metal ions between the positive and negative electrodes.

[0096] The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the positive current collector without the positive active material layer protrudes from the positive current collector with the positive active material layer. The positive current collector without the positive active material layer serves 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 positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0097] The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the negative current collector without the negative active material layer protrudes from the negative current collector with the negative active material layer. The negative current collector without the negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc.

[0098] The separator can be made of PP, polypropylene, PE, polyethylene, etc. The electrode assembly mentioned in the embodiments of this application has a wound or stacked structure.

[0099] The materials of the casing include, but are not limited to, aluminum, steel, plastic, or other materials resistant to electrolyte corrosion.

[0100] In some battery cells in related technologies, the casing includes a body and a cover. The cover is located at the open end of the body, and the edge of the cover is welded to the body to form a weld. An electrode component is set on the cover, which includes an electrode body and a connecting structure. The connecting structure is welded to the cover to form a second weld. When the size of the electrode component needs to be increased, these two welds will be close together, interfering with each other and affecting the connection strength between the body and the cover, as well as the connection strength between the electrode component and the cover.

[0101] In view of this, this application proposes a battery cell, comprising: a housing and terminal post components. The housing includes a body and a cover, at least one end of the body in a first direction is an open end, the cover is disposed at the open end, and the cover has a mounting hole. The terminal post components are disposed at the mounting hole and include a terminal post body and a connecting structure. The terminal post body is electrically connected to an electrode assembly housed within the housing, and the connecting structure surrounds the terminal post body and is insulated from it. The connecting structure is connected to the cover to form a first solder mark, and the cover is connected to the body to form a second solder mark. The cover includes a solid portion spaced between the first solder mark and the second solder mark. In the above technical solution, while increasing the size of the terminal post components, the size of the cover needs to be considered so that the cover can have a solid portion spaced between the first solder mark and the second solder mark. This reduces the mutual thermal influence between the first solder mark and the second solder mark, improves the connection strength between the connecting structure and the cover, and the connection strength between the cover and the body, thereby improving the reliability of the battery cell.

[0102] The technical solutions described in the embodiments of this application are applicable to battery cells, battery devices containing battery cells, and electrical devices using battery devices.

[0103] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0104] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0105] Please refer to Figure 1 , Figure 1 The diagram below illustrates the structure of a vehicle according to some embodiments of this application. The vehicle 1000 is equipped with a battery device 100, which may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000.

[0106] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0107] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0108] Please refer to Figure 2 , Figure 2 The image shows an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a battery cell 102 and a housing 101 for housing the battery cell 102. The housing 101 can have various structural forms.

[0109] In some embodiments, the housing 101 may include a first housing portion 1011 and a second housing portion 1012, which overlap each other, and together define a receiving space for accommodating the battery cell 102. A sealing material may also be provided at the connection point between the first housing portion 1011 and the second housing portion 1012 to achieve a sealed connection between them.

[0110] For example, refer to Figure 2 The first box section 1011 and the second box section 1012 can both be hollow structures with an opening on one side. The opening side of the first box section 1011 covers the opening side of the second box section 1012, thus forming a box 101 with a storage space. Alternatively, the second box section 1012 can be a hollow structure with an opening on one side, and the first box section 1011 can be a lid that covers the opening side of the second box section 1012. The box 101 can have various shapes, such as a cylindrical box or a cuboid box.

[0111] In the battery device 100, there can be one or more battery cells 102. If there are multiple battery cells 102, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 102 are connected in both series and parallel configurations. Multiple battery cells 102 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 102 is housed in the housing 101. Alternatively, multiple battery cells 102 can first be connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed configuration to form an entire assembly, which is then housed in the housing 101. In some embodiments, multiple battery cells 102 can be electrically connected through a busbar component to achieve parallel, series, or mixed configurations of the multiple battery cells 102.

[0112] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the structure of a battery cell 102 provided in some embodiments of this application. The battery cell 102 is in the form of a cuboid. However, it is not limited to this; the battery cell 102 in the embodiments of this application may also be cylindrical or other shapes.

[0113] Reference Figure 3 and Figure 4 , Figure 4 This is a partial cross-sectional view of a battery cell provided in some embodiments of this application; the battery cell 102 includes a housing 1 and a terminal post 2. The housing 1 includes a body 11 and a cover 12. At least one end of the body 11 in a first direction F1 is an open end 111. The cover 12 is disposed on the open end 111 and has a mounting hole 121. The terminal post 2 is disposed at the mounting hole 121. The open end 111 refers to the solid portion at the end of the body 11, which defines an opening area.

[0114] For example, when the battery cell 102 is in the form of a cuboid, the height direction of the battery cell 102 is the first direction F1, the thickness direction of the battery cell 102 is the second direction F2, and the width direction of the battery cell 102 is the third direction F3. The first direction F1, the second direction F2, and the third direction F3 are all perpendicular to each other.

[0115] For example, one end of the shell 11 in the first direction F1 is an open end 111 and the other end is a closed end, and the shell cover 12 is one and covers the open end 111 of the shell 11; as another example, both ends of the shell 1 in the first direction F1 are open ends 111, and the shell cover 12 is two and covers the two open ends 111 of the shell 11 respectively.

[0116] The electrode component 2 includes an electrode body 21 and a connecting structure 22. The electrode body 21 is electrically connected to the electrode assembly 3 housed within the housing 1. For example, the electrode assembly 3 may include a tab portion 31 and an active material coating portion 32. The active material coating portion 32 is connected to the electrode body 21 via the tab portion 31. The connection between the tab portion 31 and the electrode body 21 can be direct or indirect. The electrode assembly 3 can be in a wound or stacked form. The portion of the current collector in the electrode assembly 3 coated with an active material layer constitutes the active material coating portion 32, and the portion without an active material layer constitutes the tab portion 31. The tab portion 31 includes multiple layers of tab sheets.

[0117] The adapter structure 22 surrounds the electrode body 21 and is insulated from it. That is, the electrode body 21 and the adapter structure 22 are connected, and the electrode body 21 and the adapter structure 22 are separated by an insulating material, so the electrode bodies 21 do not conduct electricity to each other. The adapter structure 22 is connected to the cover 12 to form a first solder mark 4, and the cover 12 is connected to the body 11 to form a second solder mark 5. The cover 12 includes a solid portion 122 spaced between the first solder mark 4 and the second solder mark 5.

[0118] In the above technical solution, while increasing the size of the terminal component 2, the size of the cover 12 needs to be considered so that the cover 12 can have a solid portion 122 spaced between the first solder mark 4 and the second solder mark 5, so that the first solder mark 4 and the second solder mark 5 are spaced apart, that is, the two solder marks do not contact each other and have a certain distance. In this way, the solid portion 122 of the cover 12 itself can be used to block the mutual thermal influence between the first solder mark 4 and the second solder mark 5, thereby improving the connection strength between the adapter structure 22 and the cover 12, as well as the connection strength between the cover 12 and the shell 11, thereby improving the reliability of the battery cell 102.

[0119] Furthermore, by providing the cover 12 to support the terminal post component 2, the battery cell 102 can be flexibly manufactured and processed. For example, exemplarily, during the production process of the battery cell 102, the electrode tabs of the electrode assembly 3 can be pre-welded into plate-shaped tab portions 31. Then, the electrode assembly 3 can be installed onto the cover 12, so that the tab portions 31 pass through the mounting holes 121 from the inside out. After that, the housing body 11 is fitted onto the electrode assembly 3 and welded to the cover 12. Then, the terminal post component 2 is placed on the cover 12 and welded to the tab portion 31. After that, the terminal post component 2 is rotated 90° and placed on the cover 12. The adapter structure 22 is then welded to the cover 12, and a sealing test is performed. However, this application is not limited to this. For example, in other embodiments of this application, the adapter structure 22 can be welded to the cover 12 first, and then the housing body 11 can be fitted onto the electrode assembly 3, and then the housing body 11 can be welded to the cover 12.

[0120] Therefore, when the cover 12 and the body 11 are welded together to obtain the second weld mark 5, and then the cover 12 and the adapter structure 22 are welded together, if there is no solid part 122, the heat from welding the adapter structure 22 and the cover 12 will affect the shape of the second weld mark 5, affect the connection reliability between the cover 12 and the body 11, thus affecting the sealing and stress, and affecting the reliability of the battery cell 102. On the other hand, if the cover 12 and the adapter structure 22 are welded together to obtain the first weld mark 4, and then the cover 12 and the body 11 are welded together, if there is no solid part 122, the heat from welding the cover 12 and the body 11 will affect the first weld mark 4, affect the connection reliability between the cover 12 and the adapter structure 22, thus affecting the sealing and stress, and affecting the reliability of the battery cell 102.

[0121] For example, both the adapter structure 22 and the cover 12 can be metal parts and are formed by stamping, which can reduce production costs. Furthermore, the strength of the two parts after welding together is good, which is beneficial to improving the sealing effect and stress resistance.

[0122] In the embodiments of this application, the polarity of the electrode component 2 is not limited; it can be a cathode electrode or an anode electrode.

[0123] In some embodiments, the distance W1 between the first solder mark 4 and the second solder mark 5 is not less than 3 mm, that is, the distance between the first solder mark 4 and the second solder mark 5 is greater than or equal to 3 mm, for example, it can be 3 mm, 4 mm, 6 mm, 8 mm, or 10 mm, etc. Therefore, the distance between the first solder mark 4 and the second solder mark 5 will not be too small, thereby further reducing the mutual thermal influence between the first solder mark 4 and the second solder mark 5, further improving the connection strength between the adapter structure 22 and the cover 12, and the connection strength between the cover 12 and the body 11, and further improving the reliability of the battery cell 102.

[0124] In some embodiments, the cover 12 is a rectangular cover, and the electrode post 2 is formed into a long strip structure (e.g., rectangular, oblong, or elliptical). The length directions of the electrode post 2 and the cover 12 are consistent (e.g., the third direction F3 shown in the figure). The width W0 of the electrode post 2 is greater than or equal to 3 / 4 of the width W of the cover 12, for example, it can be 75%, 80%, or 85% of the width W of the cover 12, etc. Therefore, the dimension of the electrode post 2 in the width direction of the cover 12 is relatively large. This is beneficial in two ways: firstly, it allows for a larger conductive area of ​​the electrode post body 21 in the electrode post 2, thereby increasing the conductive area between the electrode post body 21 and the electrode assembly 3, as well as the conductive area between the electrode post body 21 and the electrode plate; secondly, it allows for a larger dimension of the connection and mating position between the electrode post body 21 and the adapter structure 22, thereby increasing the connection reliability between the electrode post body 21 and the adapter structure 22.

[0125] In some embodiments, the cover 12 is a rectangular cover, and the pole piece 2 is formed into a long strip structure (e.g., rectangular, oval, or elliptical). The pole piece 2 and the cover 12 are aligned in the same length direction (e.g., the third direction F3 shown in the figure). The distance W11 between the first solder mark 4 and the second solder mark 5 in the width direction of the cover 12 (e.g., the second direction F2 shown in the figure) is less than or equal to 1 / 8 of the width W of the cover 12. For example, it can be 1 / 8, 1 / 9, or 1 / 10 of the width W of the cover 12, etc. Therefore, the gap between the first solder mark 4 and the second solder mark 5 will not be too large, indicating that the size of the pole component 2 in the width direction of the cover 12 is relatively large. This is beneficial to increasing the conductive area of ​​the pole body 21 in the pole component 2, thereby increasing the conductive area between the pole body 21 and the electrode assembly 3, as well as the conductive area between the pole body 21 and the electrode plate. On the other hand, it is beneficial to increase the size of the connection and mating position between the pole body 21 and the adapter structure 22, thereby increasing the connection reliability between the pole body 21 and the adapter structure 22.

[0126] Please combine Figure 5 and Figure 6 In some embodiments, the cover 12 includes a body portion 123 and a stepped portion 124. The stepped portion 124 protrudes from the body portion 123 toward the pole member 2. The edge of the transition structure 22 has a first overlapping portion 221 protruding toward the cover 12. The first overlapping portion 221 overlaps the side of the stepped portion 124 away from the interior of the housing 1. The transition structure 22 participates in forming the first solder mark 4 at least through the first overlapping portion 332. Herein, the two sides in the thickness direction of the cover 12 are defined as the inner side and the outer side, respectively. That is, the side of the cover 12 facing the interior of the housing 1 is the inner side of the cover 12, and the side of the cover 12 away from the interior of the housing 1 is the outer side of the cover 12.

[0127] Therefore, by setting the first overlapping part 221 to overlap the side of the stepped part 124 away from the inside of the housing 1, it can be said that the first overlapping part 221 overlaps the outside of the stepped part 124, so that the pole member 2 can be covered on the housing cover 12 in the direction from the outside to the inside, which facilitates the assembly of the pole member 2 to the housing cover 12. Moreover, when welding the transition structure 22 and the housing cover 12, due to the overlapping cooperation between the first overlapping part 221 and the stepped part 124, the pole member 2 and the housing cover 12 can be reliably positioned, and the cooperation between the two is more stable during the welding process, thereby improving the welding quality.

[0128] refer to Figure 5 and Figure 6In some embodiments, the cover 12 extends into the body 11 to space between the adapter structure 22 and the body 11, and the distance W2 between the first overlap 221 and the body 11 is greater than or equal to 4 mm. For example, it can be 4 mm, 6 mm, 8 mm, or 10 mm, etc. Thus, there is sufficient space between the first overlap 221 and the body 11 to accommodate the cover 12, so that the size of the portion of the cover 12 between the first overlap 221 and the body 11 is sufficient to ensure that the distance between the first solder mark 4 and the second solder mark 5 is not too small. This further reduces the mutual thermal influence between the first solder mark 4 and the second solder mark 5, further improves the connection strength between the adapter structure 22 and the cover 12, and the connection strength between the cover 12 and the body 11, and further improves the reliability of the battery cell 102.

[0129] refer to Figure 5 and Figure 6 In some embodiments, the intersection of the outer peripheral surface 12a of the cover 12 facing the body 11 and the inner end surface 12b of the cover 12 forms a first chamfer 12c, and the intersection of the inner peripheral surface 12d of the cover 12 facing the first overlapping portion 221 and the outer end surface 12e of the cover 12 forms a second chamfer 12f. The minimum distance W3 between the first chamfer 12c and the second chamfer 12f along the wall thickness direction of the body 11 (i.e., the direction perpendicular to the wall thickness direction of the cover 12) is greater than or equal to 4mm. For example, it can be 4mm, 6mm, 8mm, or 10mm, etc. Here, the inner end surface 12b and the outer end surface 12e of the cover 12 refer to the two side surfaces in the wall thickness direction of the cover 12, wherein the side surface facing the inside of the body 1 is the inner end surface 12b, and the side surface facing away from the inside of the body 1 is the outer end surface 12e.

[0130] Therefore, the cover 12 has sufficient dimensions between the first overlapping portion 221 and the body 11 to ensure that the gap between the first solder mark 4 and the second solder mark 5 is not too small. This further reduces the mutual thermal influence between the first solder mark 4 and the second solder mark 5, further improves the connection strength between the adapter structure 22 and the cover 12, as well as the connection strength between the cover 12 and the body 11, and further improves the reliability of the battery cell 102. In addition, by providing the first chamfer 12c, it is easier for the cover 12 to extend into the body 11. By providing the second chamfer 11, it is easier to locate the welding position when welding the adapter structure 22 and the cover 12, thus improving the welding quality of the adapter structure 22 and the cover 12.

[0131] refer to Figure 5 and Figure 6In some embodiments, the overlap dimension W4 of the first overlapping portion 221 extending onto the stepped portion 124 in the direction from the transition structure 22 to the cover 12 is greater than or equal to 0.3 mm. For example, it can be 0.3 mm, 0.5 mm, 0.7 mm, or 1 mm, etc. Thus, the first overlapping portion 221 and the stepped portion 124 have a certain overlap width, which improves the reliability of the overlap positioning and avoids the problem of the first overlapping portion 221 detaching from the support of the stepped portion 124 due to shaking or insufficient processing accuracy.

[0132] refer to Figure 5 and Figure 6 In some embodiments, the first weld mark 4 extends along the direction from the first overlap 221 to the step 124. That is, when welding the cover 12 and the transition structure 22, the extension direction of the molten pool is from the first overlap 221 to the step 124, and the width of the first weld mark 4 gradually decreases along the direction from the first overlap 221 to the step 124. In this way, during welding, the laser can be set on the outside of the cover 12, and the cover 12 and the transition structure 22 can be welded from the outside of the cover 12, thereby facilitating the welding operation and simplifying the production of the battery cell 102.

[0133] refer to Figure 5 and Figure 6 In some embodiments, the thickness H3 of the first overlapping portion 221 in the first direction F1 is greater than or equal to 0.3 mm. For example, it can be 0.3 mm, 0.5 mm, 0.7 mm, or 1 mm, etc. Therefore, the thickness H3 of the first overlapping portion 221 in the first direction F1 is not too small, which can avoid the first overlapping portion 221 being too thin and deformed, affecting the reliability and stability of the overlap, and can also avoid the problem of insufficient welding penetration due to the first overlapping portion 221 being too thin, which could lead to poor welding between the adapter structure 22 and the housing cover 12, thereby improving the connection reliability between the pole post component 2 and the housing cover 12.

[0134] refer to Figure 5 and Figure 6In some embodiments, the cover 12 includes a second overlapping portion 125, which protrudes from the body portion 123 toward the direction away from the pole member 2. The second overlapping portion 125 overlaps the axial side of the open end 111 of the body 11, and the cover 12 participates in forming the second weld mark 5 at least through the second overlapping portion 125. For example, the two ends of the body 11 in a first direction are a first end and a second end, respectively. The first end is constructed as an open end 111, and the second overlapping portion 125 overlaps the side of the first end away from the second end. Thus, by providing the second overlapping portion 125 to overlap the axial end of the body 11, the positioning of the cover 12 and the body 11 during assembly is facilitated. When welding the cover 12 and the body 11, due to the overlapping fit of the second overlapping portion 125 and the body 11, the fit between the cover 12 and the body 11 is more stable during the welding process, thereby improving the welding quality.

[0135] In some embodiments, the welding of the cover 12 to the body 11 can be either side welding or end welding. When side welding is selected, the second weld mark 5 extends along the direction from the body 11 to the pole member 2. When end welding is selected, the second weld mark 5 extends along the direction from the second overlap portion 125 to the body 11.

[0136] refer to Figure 5 and Figure 6 For example, when the second weld mark 5 extends along the direction from the housing body 11 to the pole member 2, that is, when welding the housing cover 12 to the housing body 11, it is performed from the side of the housing body 11, and the extension direction of the molten pool is from the housing body 11 to the mounting hole 121. The width of the second weld mark 5 gradually decreases along the direction from the housing body 11 to the pole member 2. In this way, during welding, the laser can be set on the side of the housing body 11 to weld the housing cover 12 to the housing body 11, thereby facilitating the welding operation and increasing the distance between the first weld mark 4 and the second weld mark 5 to a certain extent.

[0137] refer to Figure 5 and Figure 6 In some embodiments, the side surface of the adapter structure 22 away from the interior of the housing 1 in the first direction F1 is the first end face 22a, the side surface of the adapter structure 22 near the interior of the housing 1 in the first direction F1 is the second end face 22b, the side surface of the cover 12 away from the interior of the housing 1 in the first direction F1 is the outer end face 12e of the cover 12, the first solder mark 4 extends from the first end face 22a to the second end face 22b, the first end face 22a is located in the first direction F1 on the side near the interior of the housing 1 on the plane where the outer end face 12e of the cover 12 is located, that is, the height difference between the first end face 22a and the outer end face 12e of the cover 12 in the first direction F1 is H1, and the first end face 22a is closer to the interior of the housing 1 than the outer end face 12e of the cover 12.

[0138] The first weld mark connecting the pole component and the housing cover surrounds the entire circumference of the transition structure. During welding, a spot weld can be performed on a point in the circumferential direction of the transition structure first, and then full welding can be performed along the circumference. During spot welding, it is easy to cause the opposite side of the transition structure to warp up. For example, when the transition structure is long and narrow, spot welding on one side in the width direction of the transition structure can easily cause the other side in the width direction of the transition structure to warp up towards the outside of the housing cover, forming a warped step between the transition structure and the housing cover. When the full welding reaches the position of the warped step, the weld mark is prone to forming welding defects such as cracks at this point (the warped step of the transition structure and the housing cover will exert a pulling force on the weld mark in both directions, tearing the weld mark), affecting the connection reliability between the pole component and the housing cover.

[0139] In the embodiments of this application, since the first end face 22a is located on the side of the plane where the outer end face 12e of the cover 12 is located in the first direction F1, which is closer to the inside of the housing 1, it means that the first end face 22a does not protrude or warp relative to the outer end face 12e of the cover 12 toward the outside of the cover 12. It does not form a warped step caused by spot welding, thus avoiding welding defects caused by full welding at the warped step. This can improve the welding quality between the transition structure 22 and the cover 12, thereby improving the connection reliability between the pole component 2 and the cover 12.

[0140] refer to Figure 5 and Figure 6 In some embodiments, the height difference between the first end face 22a and the outer end face 12e of the cover 12 in the first direction F1 is H1, and the thickness of the cover 12 in the first direction F1 is H2. The ratio of H1 to H2 is 1 / 26-1 / 13, that is, 1 / 26≤H1 / H2≤1 / 13. For example, H1 / H2 can be 1 / 26, 1 / 20, 1 / 18, 1 / 16, 1 / 14, or 1 / 13, etc. Therefore, the height difference H1 between the first end face 22a and the outer end face 12e of the cover 12 in the first direction F1 is not too small, which can reserve a larger space for the transition structure 22, thereby better avoiding the warping step formed due to spot welding, improving the welding quality of the transition structure 22 and the cover 12, and thus improving the connection reliability of the pole component 2 and the cover 12. Furthermore, the height difference H1 between the first end face 22a and the outer end face 12e of the shell cover 12 in the first direction F1 is not too large, so the transition structure 22 does not need to be thinned too much, and the shell cover 12 does not need to be thickened too much, which is conducive to ensuring the melting depth and low cost. For example, when the transition structure 22 includes the first overlapping part 221, it means that the wall thickness of the first overlapping part 221 does not need to be too thin, which is conducive to ensuring the melting depth and improving the connection reliability between the transition structure 22 and the shell cover 12, and the wall thickness of the shell cover 12 does not need to be too thick, which is conducive to reducing costs.

[0141] refer to Figure 5 and Figure 6In some embodiments, the height difference between the first end face 22a and the outer end face 12e of the cover 12 in the first direction F1 is H1, where H1 is 0.05mm-0.15mm, that is, 0.05≤H1≤0.15mm. For example, H1 can be 0.05mm, 0.07mm, 0.09mm, 0.10mm, 0.12mm, or 0.15mm, etc. Therefore, the height difference H1 between the first end face 22a and the outer end face 12e of the cover 12 in the first direction F1 is not too small, which allows for a larger space for the transition structure 22 to be raised, thereby better avoiding the raised step caused by spot welding, improving the welding quality of the transition structure 22 and the cover 12, and thus improving the connection reliability of the pole component 2 and the cover 12. Furthermore, the height difference H1 between the first end face 22a and the outer end face 12e of the shell cover 12 in the first direction F1 is not too large, so the transition structure 22 does not need to be thinned too much, and the shell cover 12 does not need to be thickened too much, which is conducive to ensuring the melting depth and low cost. For example, when the transition structure 22 includes the first overlapping part 221, it means that the wall thickness of the first overlapping part 221 does not need to be too thin, which is conducive to ensuring the melting depth and improving the connection reliability between the transition structure 22 and the shell cover 12, and the wall thickness of the shell cover 12 does not need to be too thick, which is conducive to reducing costs.

[0142] refer to Figure 5 and Figure 6In some embodiments, the height difference between the first end face 22a and the outer end face 12e of the cover 12 in the first direction F1 is H1, and the thickness of the cover 12 in the first direction F1 is H2. The ratio of H1 to H2 is 1 / 26-1 / 13, that is, 1 / 26≤H1 / H2≤1 / 13. For example, H1 / H2 can be 1 / 26, 1 / 20, 1 / 18, 1 / 16, 1 / 14, or 1 / 13, etc. Simultaneously, the height difference between the first end face 22a and the outer end face 12e of the cover 12 in the first direction F1 is H1, and H1 is 0.05mm-0.15mm, that is, 0.05mm≤H1≤0.15mm. For example, H1 can be 0.05mm, 0.07mm, 0.09mm, 0.10mm, 0.12mm, or 0.15mm, etc. Therefore, the height difference H1 between the first end face 22a and the outer end face 12e of the shell cover 12 in the first direction F1 is not too small, which allows for a larger space for the transition structure 22 to be raised, thereby better avoiding the raised step caused by spot welding, improving the welding quality between the transition structure 22 and the shell cover 12, and thus improving the connection reliability between the pole component 2 and the shell cover 12. Moreover, the height difference H1 between the first end face 22a and the outer end face 12e of the shell cover 12 in the first direction F1 is not too large, so the transition structure 22 does not need to be thinned too much, and the shell cover 12 does not need to be thickened too much, which is conducive to ensuring the penetration depth and low cost. For example, when the transition structure 22 includes the first overlapping part 221, it means that the wall thickness of the first overlapping part 221 does not need to be too thin, which is conducive to ensuring the penetration depth and improving the connection reliability between the transition structure 22 and the shell cover 12, and the wall thickness of the shell cover 12 does not need to be too thick, which is conducive to reducing costs. Moreover, the cover 12 is not too thin, which can better ensure the welding penetration depth, and the cover 12 is not too thick, which helps to reduce costs.

[0143] refer to Figure 5 and Figure 6 In some embodiments, the thickness of the cover 12 in the first direction F1 is H2, where H2 is 1.5mm-3mm. That is, 1.5mm≤H2≤3mm. For example, H1 can be 1.5mm, 1.8mm, 2.0mm, 2.5mm, 2.8mm, or 3.0mm, etc. Therefore, the cover 12 is not too thin, which can better ensure the rigidity of the cover 12, improve the load-bearing capacity of the pole member 2, and help ensure the weld penetration depth. Furthermore, the cover 12 is not too thick, which helps reduce costs.

[0144] For example, the cover 12 is a rectangular cover. When the ratio of the length L1 to the width W of the cover 12 is greater than or equal to 10, the thickness H2 of the cover 12 in the first direction F1 is 3mm. That is, when the cover 12 is relatively slender, the thickness of the cover 12 is set to be relatively large to improve the rigidity of the cover 12 and avoid deformation problems caused by excessive deflection of the cover 12.

[0145] For example, the cover 12 is a rectangular cover. When the ratio of the length L1 to the width W of the cover 12 is less than 10, the thickness H2 of the cover 12 in the first direction F1 is 2mm. That is to say, when the cover 12 is not so slender, the deflection of the cover 12 is relatively small, and the thickness of the cover 12 does not need to be set too thick to avoid the deformation problem of the cover 12, thereby helping to reduce the cost of the cover 12.

[0146] refer to Figure 5 and Figure 6 In some embodiments, the electrode post component 2 includes a seal 23, which is sealed between the electrode post body 21 and the adapter structure 22. Therefore, the electrode post component 2 itself has sealing capabilities, eliminating the need to consider sealing issues when connecting the electrode post component 2 to the housing cover 12. This reduces the sealing pressure on the housing 1 when connected to the electrode post component 2, thus protecting the housing 1. For example, the seal 23 can be a rubber ring, etc.

[0147] In the embodiments of this application, since the "pole body 21 and the adapter structure 22 are insulatedly connected," it is explained that the pole body 21 and the adapter structure 22 are separated by an insulating material. The "insulating material" is not limited; for example, it can be solely the sealing element 23, or a combination of the sealing element 23 and the insulating element 24, or an insulating layer may also be provided. The insulating element 24 has a higher hardness than the sealing element 23, and the sealing function is mainly achieved by the elastic sealing element 23. For example, the insulating element 24 can be an insulating plastic part, which can be injection molded separately or injection molded integrally with the pole body 21.

[0148] The connection method between the pole body 21 and the adapter structure 22 is not limited. For example, the adapter structure 22 can clamp the pole body 21 (e.g. Figure 4 (as shown), or it could be the pole body 21 holding the adapter structure 22 (e.g.) Figure 5 and Figure 6 (As shown).

[0149] In some embodiments, reference Figure 5 and Figure 6The electrode post body 21 passes through the adapter structure 22 and includes an inner clamping portion 211 and an outer clamping portion 212. The outer clamping portion 212 clamps the outer side of the adapter structure 22 (i.e., the side away from the interior of the housing 1), and the inner clamping portion 211 clamps the inner side of the adapter structure 22 (i.e., the side closer to the interior of the housing 1). The sealing member 23 is clamped between the inner clamping portion 211 and the adapter structure 22. The electrode post component 2 also includes an insulating member 24, which includes a first insulating member 241. The first insulating member 241 is clamped between the outer clamping portion 212 and the adapter structure 22. Thus, by clamping the adapter structure 22 with the electrode post body 21, the sealing member 23 can seal from the side closer to the interior of the housing 1, which can more effectively prevent electrolyte leakage from the mating position of the electrode post body 21 and the adapter structure 22, improving reliability.

[0150] The pole body 21 can be a single piece or a separate piece. For example, the pole body 21 can be partially riveted and deformed to clamp the adapter structure 22. Alternatively, the pole body 21 can be assembled by welding or bonding multiple parts together to clamp the adapter structure 22. This simplifies the design of the adapter structure 22 and allows for diverse designs of the pole body 21.

[0151] In some embodiments, reference Figure 5 and Figure 6 The adapter structure 22 defines a through hole 222. The pole body 21 includes a first part 21a and a second part 21b. The first part 21a is a single piece and includes a through part 213 and an inner clamping part 211. The second part 21b is a single piece and includes an outer clamping part 212. The through part 213 passes through the through hole 222. One end of the through part 213 near the inside of the housing 1 is connected to the inner clamping part 211. The other end of the through part 213 away from the inside of the housing 1 is connected to the outer clamping part 212 to form a third weld mark 6. The sealing member 23 is provided at the through hole 222 and surrounds the through part 213 to clamp between the edge of the adapter structure 22 near the through hole 222 and the inner clamping part 211. The third weld mark 6 is provided relative to the sealing member 23 near the central axis L of the through part 213.

[0152] Therefore, by setting the pole body 21 as described above and arranging the relative positions of the third weld mark 6 and the sealing element 23, the sealing element 23 can be reliably clamped after the first part 21a and the second part 21b are welded. The rebound force of the sealing element 23 is less likely to cause the welded positions of the first part 21a and the second part 21b to separate or loosen, thus improving the sealing reliability. Furthermore, the welded positions of the first part 21a and the second part 21b are on the outer side, which facilitates the welding operation and ensures the welding quality.

[0153] In some embodiments, reference Figure 5 and Figure 6The transition structure 22 has a first end face 22a on the side of the housing 1 furthest from the interior in the first direction F1, and a second end face 22b on the side of the transition structure 22 closest to the interior in the housing 1 in the first direction F1. The first solder mark 4 extends from the first end face 22a toward the second end face 22b. The first insulating member 241 includes a first gap portion 2411 clamped between the outer clamping portion 212 and the transition structure 22, and an outer covering portion 2412 covering the outer peripheral surface of the outer clamping portion 212. The distance W5 between the outer covering portion 2412 and the edge of the first end face 22a is greater than or equal to 2 mm. For example, 2.0 mm, 2.5 mm, 2.8 mm, or 3.0 mm, etc.

[0154] Therefore, the insulation protection range of the first insulating component 241 is relatively large, which is beneficial to improving the reliability of the battery cell 102. Furthermore, by leaving some distance between the outer casing 2412 and the edge of the first end face 22a, a protective cover can be set between the laser and the outer casing 2412 to protect the outer casing 2412 when welding the transition structure 22 and the shell cover 12, thereby reducing the risk of the first insulating component 241 being burned by welding heat and protecting the first insulating component 241.

[0155] In some embodiments, reference Figure 5 and Figure 6 A groove 223 is formed on the first end face 22a, and a first insulating member 241 is embedded in the groove 223. The distance W6 between the edge of the groove 223 and the edge of the first end face 22a is greater than or equal to 2 mm. For example, 2.0 mm, 2.5 mm, 2.8 mm or 3.0 mm, etc.

[0156] In this way, by setting the groove 223, the fit stability of the first insulating member 241 can be improved. Furthermore, by setting the distance W6 between the edge of the groove 223 and the edge of the first end face 22a to be greater than or equal to 2mm, it is indicated that there is sufficient space outside the groove 223 at the edge position of the transition structure 22 to set a protective cover to protect the outer casing 2412, thereby facilitating the protection of the first insulating member 241.

[0157] In some embodiments, reference Figure 5 and Figure 6 The distance W5 between the outer casing 2412 and the edge of the first end face 22a is less than or equal to 1 / 8 of the width W of the cover. For example, it can be 1 / 8, 1 / 9, or 1 / 10 of the width W of the cover 12, etc. Therefore, the outer casing 2412 can be relatively close to the edge of the first end face 22a, so as to reserve a larger space for the outer clamping part 212 to have a larger size, which is beneficial to increasing the connection area between the outer clamping part 212 and the electrode, and improving the conductivity efficiency.

[0158] In some embodiments, reference Figure 5 and Figure 6 The terminal post component 2 also includes a second insulating member 242. The second insulating member 242 is mounted on the adapter structure 22 and located on the side of the adapter structure 22 closer to the interior of the housing 1, surrounding the seal 23. The second insulating member includes a second spacer portion 2421 and an extension portion 2422. The second spacer portion 2421 is spaced between the inner clamping portion 211 and the adapter structure 22. The extension portion 2422 extends from the second spacer portion 2421 towards the housing 11, and is located outside the coverage area of ​​the inner clamping portion 211 but within the coverage area of ​​the adapter structure 22. Therefore, the inner side of the terminal post component 2 has a larger insulating area, allowing for the omission or reduction of the insulating support, simplifying the structure of the battery cell 102. The connection method between the second insulating member 242 and the adapter structure 22 is not limited; for example, it can be snap-fitted or welded.

[0159] In some embodiments, reference Figure 5 and Figure 6 The transition structure 22 has a second end face 22b on the side surface near the interior of the housing 1 in the first direction F1. The distance W7 between the edge of the extension 2422 and the edge of the second end face 22b is greater than or equal to 2 mm. For example, 2.0 mm, 2.5 mm, 2.8 mm, or 3.0 mm. This means that at the edge of the transition structure 22, there can be sufficient space outside the extension 2422 to install the helium detection rubber nozzle, allowing the helium detection rubber nozzle to be stably and reliably pressed in, thus improving the reliability of helium detection.

[0160] According to a second aspect of the present application, the present application also provides a battery device 100, including a battery cell 102 of any of the above-described embodiments.

[0161] It is worth noting that the battery device 100 according to the embodiments of this application may include a housing 101 or may not include a housing 101. Therefore, since the reliability of the battery cell 102 according to the embodiments of this application is improved, it is beneficial to improve the performance of the battery device 100.

[0162] For example, the battery device 100 further includes a busbar, and at least two of the battery cells 102 are electrically connected through the busbar. This allows for the series and / or parallel connection of multiple battery cells 102. For instance, when multiple battery cells 102 are connected in series, the negative terminal 2 of one battery cell 102 is connected to the positive terminal 2 of the next battery cell 102 through a busbar, while the positive terminal 2 of the same battery cell 102 is connected to the negative terminal 2 of the previous battery cell 102 through another busbar.

[0163] For example, combined Figure 2The battery device 100 includes a housing 101, multiple battery cells 102 housed within the housing 101, and a bottom plate 1013 at the bottom of the housing 101. A terminal post 2 is located on the side of the housing 1 facing the bottom plate 1013, or on the side of the housing 1 away from the bottom plate 1013.

[0164] During the use of the battery device 100, such as in vehicle use, the bottom plate 1013 of the housing is located at the bottom of the housing 101 in the direction of gravity. Thus, when the terminal post 2 is located on the side of the housing 1 facing the bottom plate 1013, it means the terminal post 2 is located at the bottom of the housing 1 in the direction of gravity; and when the terminal post 2 is located on the side of the housing 1 away from the bottom plate 1013, it means the terminal post 2 is located at the top of the housing 1 in the direction of gravity. Therefore, the relative position of the terminal post 2 and the bottom plate 1013 is not limited, allowing for flexible arrangement of the battery cell 102 and the housing 101.

[0165] According to a third aspect of this application, this application also provides an electrical device including a battery device 100 of any of the above-described embodiments, the battery device 100 being used to provide electrical energy to the electrical device. The electrical device can be any of the aforementioned devices or systems using the battery device 100. Because the performance of the battery device 100 is improved, it is beneficial to improve the power consumption performance of the electrical device.

[0166] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0167] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: The housing includes a body and a cover, wherein at least one end of the body is an open end in a first direction, the cover is disposed on the open end, and the cover has mounting holes. An electrode component is provided at the mounting hole and includes an electrode body and a connecting structure. The electrode body is electrically connected to an electrode assembly housed in the housing, and the connecting structure surrounds the electrode body and is insulated from the electrode body. The adapter structure is connected to the shell cover to form a first solder mark, and the shell cover is connected to the shell body to form a second solder mark. The shell cover includes a solid portion spaced between the first solder mark and the second solder mark.

2. The battery cell according to claim 1, characterized in that, The distance W1 between the first solder mark and the second solder mark is greater than or equal to 3 mm.

3. The battery cell according to claim 1, characterized in that, The cover is a rectangular cover, and the pole component is formed into a long strip structure that is consistent with the length direction of the cover. The distance W11 between the first solder mark and the second solder mark in the width direction of the cover is less than or equal to 1 / 8 of the width W of the cover.

4. The battery cell according to claim 1, characterized in that, The cover is a rectangular cover, and the pole piece is formed into a long strip structure that is consistent with the length direction of the cover. The width W0 of the pole piece is greater than or equal to 3 / 4 of the width W of the cover.

5. The battery cell according to claim 1, characterized in that, The cover includes a body portion and a stepped portion, the stepped portion protruding from the body portion toward the pole member, and the edge of the transition structure having a first overlapping portion protruding toward the cover, the first overlapping portion overlapping the side of the stepped portion away from the interior of the housing, and the transition structure participating in the formation of the first solder mark at least through the first overlapping portion.

6. The battery cell according to claim 5, characterized in that, The cover extends into the body to be spaced between the adapter structure and the body, and the distance W2 between the first overlapping portion and the body is greater than or equal to 4 mm.

7. The battery cell according to claim 5, characterized in that, The first chamfer is formed at the intersection of the outer peripheral surface of the shell facing the shell body and the inner end surface of the shell cover, and the second chamfer is formed at the intersection of the inner peripheral surface of the shell cover facing the first overlapping part and the outer end surface of the shell cover. The minimum distance W3 between the first chamfer and the second chamfer in the direction perpendicular to the wall thickness direction of the shell cover is greater than or equal to 4 mm.

8. The battery cell according to claim 5, characterized in that, The overlap dimension W4 of the first overlap portion extending onto the stepped portion in the direction from the transition structure to the shell cover is greater than or equal to 0.3 mm.

9. The battery cell according to claim 5, characterized in that, The first solder mark extends along the direction from the first overlap to the step portion.

10. The battery cell according to claim 9, characterized in that, The thickness H3 of the first overlapping portion in the first direction is greater than or equal to 0.3 mm.

11. The battery cell according to claim 5, characterized in that, The cover includes a second overlap portion that protrudes from the body portion toward a direction away from the pole member. The second overlap portion overlaps the axial side of the open end of the body. The cover participates in forming the second solder mark at least through the second overlap portion.

12. The battery cell according to claim 11, characterized in that, The second solder mark extends along the direction from the housing to the pole member.

13. The battery cell according to claim 1, characterized in that, The adapter structure has a first end face on the side away from the interior of the housing in the first direction, and a second end face on the side of the adapter structure closer to the interior of the housing in the first direction. The cover has an outer end face on the side away from the interior of the housing in the first direction. The first solder mark extends from the first end face to the second end face. The first end face is located on the side of the plane containing the outer end face of the cover closer to the interior of the housing in the first direction.

14. The battery cell according to claim 13, characterized in that, The ratio of the height difference H1 between the first end face and the outer end face of the shell in the first direction to the thickness H2 of the shell in the first direction is 1 / 26-1 / 13; and / or, the height difference H1 between the first end face and the outer end face of the shell in the first direction is 0.05mm-0.15mm.

15. The battery cell according to claim 1, characterized in that, The thickness H2 of the shell cover in the first direction is 1.5mm-3mm.

16. The battery cell according to claim 15, characterized in that, The cover is a rectangular cover, the ratio of the length L1 to the width W of the cover is greater than or equal to 10, and the thickness H2 of the cover in the first direction is 3 mm.

17. The battery cell according to claim 15, characterized in that, The cover is a rectangular cover, the ratio of the length L1 to the width W of the cover is less than 10, and the thickness H2 of the cover in the first direction is 2 mm.

18. The battery cell according to claim 1, characterized in that, The pole component includes a seal that is sealed between the pole body and the adapter structure.

19. The battery cell according to claim 18, characterized in that, The electrode post body passes through the adapter structure and includes an inner clamping part and an outer clamping part. The outer clamping part is clamped on the side of the adapter structure away from the inside of the housing, and the inner clamping part is clamped on the side of the adapter structure close to the inside of the housing. The sealing member is clamped between the inner clamping part and the adapter structure. The electrode post component also includes a first insulating member, which is clamped between the outer clamping part and the adapter structure.

20. The battery cell according to claim 19, characterized in that, The adapter structure defines a through hole. The pole body includes a first part and a second part. The first part is a single piece and includes a through portion and the inner clamping portion. The second part is a single piece and includes the outer clamping portion. The through portion passes through the through hole. One end of the through portion near the inside of the housing is connected to the inner clamping portion. The other end of the through portion away from the inside of the housing is connected to the outer clamping portion to form a third weld mark. The sealing member is disposed at the through hole and surrounds the through portion to clamp between the edge of the adapter structure near the through hole and the inner clamping portion. The third weld mark is disposed relative to the central axis of the sealing member near the through portion.

21. The battery cell according to claim 19, characterized in that, The adapter structure has a first end face on the side away from the interior of the housing in the first direction, and a second end face on the side of the adapter structure closer to the interior of the housing in the first direction. The first solder mark extends from the first end face to the second end face. The first insulating member includes a first spacer portion clamped between the outer clamping portion and the adapter structure, and an outer covering portion covering the outer peripheral surface of the outer clamping portion. The distance W5 between the outer covering portion and the edge of the first end face is greater than or equal to 2 mm.

22. The battery cell according to claim 21, characterized in that, A groove is formed on the first end face, and the first insulating member is embedded in the groove. The distance W6 between the edge of the groove and the edge of the first end face is greater than or equal to 2 mm.

23. The battery cell according to claim 21, characterized in that, The distance W5 between the outer casing and the edge of the first end face is less than or equal to 1 / 8 of the width W of the shell cover.

24. The battery cell according to claim 19, characterized in that, The pole component further includes a second insulating member, which is mounted on the adapter structure and located on the side of the adapter structure closer to the inside of the housing and surrounding the seal. The second insulating member includes a second spacer and an extension. The second spacer is spaced between the inner clamping portion and the adapter structure. The extension extends from the second spacer toward the housing body. The extension is located outside the coverage area of ​​the inner clamping portion and within the coverage area of ​​the adapter structure.

25. The battery cell according to claim 24, characterized in that, The adapter structure has a second end face on the side of the housing near the interior in the first direction, and the distance W7 between the extension and the edge of the second end face is greater than or equal to 2 mm.

26. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-25.

27. An electrical appliance, characterized in that, Includes the battery device according to claim 26.

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