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, a pole column component and an electrode assembly. The pole column component comprises a pole column body, a switching structure and an inner insulation piece. The switching structure surrounds the pole column body and is connected with the shell. The switching structure is insulatedly connected with the pole column body. The inner insulation piece is arranged on the switching structure and is located on the side of the switching structure facing the accommodating cavity. The inner insulation piece is provided with a protruding part protruding towards the accommodating cavity. The protruding part is arranged close to the outer end of the inner insulation piece relative to the inner end of the inner insulation piece. In the technical scheme, the inner insulation piece can block the switching structure and the electrode assembly to some extent, thereby reducing the risk of short circuit connection between the electrode assembly and the switching structure. Furthermore, the protruding part arranged on the inner insulation piece can block the damaged tab piece, thereby reducing the probability of electrical conduction between the tab part and the switching structure or the shell, 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, 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, a terminal post component, and an electrode assembly. The housing defines a receiving cavity. The terminal post component is disposed on the housing and includes a terminal post body and a connecting structure. The connecting structure surrounds the terminal post body and is connected to the housing, and the connecting structure is insulated from the terminal post body. The electrode assembly includes an active material coating portion disposed within the receiving cavity and a conductive portion connected between the active material coating portion and the terminal post body. The conductive portion includes an electrode tab portion connected to the active material coating portion. The terminal post component further includes an inner insulating member, which is disposed on the connecting structure and located on the side of the connecting structure facing the receiving cavity. The inner insulating member has a protrusion protruding in the direction of the receiving cavity. The end of the inner insulating member closer to the terminal post body is the inner end of the inner insulating member, and the end of the inner insulating member away from the terminal post body is the outer end of the inner insulating member. The protrusion is disposed relative to the inner end of the inner insulating member and closer to the outer end of the inner insulating member.

[0005] In the above technical solution, by setting an inner insulating component, the connection between the transfer structure and the electrode assembly can be isolated to a certain extent, thereby reducing the risk of short circuit between the electrode assembly and the transfer structure. Furthermore, by setting a protrusion at or near the edge of the inner insulating component, when some electrode tabs in the tab part are damaged and extend towards the edge of the transfer structure or the housing, the protrusion can be used to block these electrode tabs, reducing the probability of electrical conduction between the electrode tab part and the transfer structure or the housing, thereby improving the reliability of the battery cell.

[0006] In some embodiments, the protrusion is provided at the outer end of the inner insulating member and protrudes from the outer end of the inner insulating member toward the receiving cavity.

[0007] In the above technical solution, by placing the protrusion at the outer end of the inner insulating part, a larger blocking range can be achieved, further reducing the probability of electrical conduction between the tab and the adapter structure or the casing, thereby improving the reliability of the battery cell.

[0008] In some embodiments, the housing includes a shell body, one end of which is an open end in a first direction, an active material coating portion is disposed inside the shell body, an electrode post is disposed on the side of the active material coating portion near the open end in the first direction, and a first gap is formed between the protrusion and the shell body.

[0009] In the above technical solution, by setting a first gap between the protrusion and the shell, during the processing of the battery cell, when installing the terminal post component into the shell, the problem of assembly interference between the protrusion of the inner insulation component and the shell can be avoided. Furthermore, the setting of the protrusion can reduce the risk of damaged electrode tabs being inserted into the first gap and electrically connected to the adapter structure or the shell, thereby improving the reliability of the battery cell.

[0010] In some embodiments, the battery cell further includes an insulating support, which is disposed in the housing and located within the receiving cavity. The insulating support includes a first support portion disposed within a first gap, and the first support portion is spaced apart from the inner insulating member to form a second gap between the first support portion and the inner insulating member.

[0011] In the above technical solution, by setting an insulating support and using the first support portion to fill a portion of the first gap, the risk of damaged tabs entering the first gap and making electrical connections with the transition structure or the casing can be further avoided, thereby improving the reliability of the battery cell. Furthermore, by setting a second gap between the first support portion and the inner insulating component, the problem of assembly interference between the inner insulating component and the insulating support can be avoided when installing the terminal post component into the casing. The protrusion reduces the risk of damaged tabs being inserted backwards into the second gap and making electrical connections with the transition structure or the casing, thereby improving the reliability of the battery cell.

[0012] In some embodiments, the distance W0 between the first support portion and the inner insulating member is 0.1mm-0.5mm.

[0013] In the above technical solution, the second gap is not too large, which can better reduce the risk of the damaged tab being inserted into the second gap and making electrical contact with the transition structure or the housing. Moreover, the second gap is not too small, which can better avoid the problem of assembly interference between the inner insulating component and the insulating support.

[0014] In some embodiments, the adapter structure has a connection portion extending beyond the coverage of the inner insulation member in a direction away from the pole body, the adapter structure being connected to the housing via the connection portion, and at least a portion of the first support portion being located on the side of the connection portion closer to the receiving cavity.

[0015] In the above technical solution, since the adapter structure has a connecting portion extending beyond the coverage area of ​​the inner insulation member in a direction away from the electrode body, it indicates that the inner insulation member does not extend beyond the coverage area of ​​the adapter structure. This allows the electrode component to be installed into the housing along a direction from the outside to the inside of the housing, facilitating the installation of the electrode component. Furthermore, since at least a portion of the first support portion is located on the side of the connecting portion closer to the receiving cavity, it indicates that the connecting portion covers at least a portion of the first support portion. This allows the first support portion to, to a certain extent, prevent the risk of electrical conduction caused by contact between a damaged electrode tab and the adapter structure, thereby improving the reliability of the battery cell.

[0016] In some embodiments, the housing further includes a cover, which is disposed at the open end and has mounting holes. The pole member is disposed at the mounting holes, the connecting part is welded to the cover, and the insulating bracket is mounted on the cover.

[0017] In the above technical solution, the overall size of the pole post component is relatively smaller than that of the housing cover, which helps to shorten the length of the pole lug, reduce the space occupied by the pole lug in the receiving cavity, and reduce problems such as damage and inversion caused by the redundancy of the pole lug. Moreover, by installing the insulating bracket on the housing cover, it is convenient to install the insulating bracket. For example, the insulating bracket can be fixed on the housing cover first, and then the housing cover and housing body can be assembled together.

[0018] In some embodiments, the end of the connector near the cover has a first overlapping portion, and the end of the cover near the pole member has a stepped portion, with the first overlapping portion overlapping the side of the stepped portion away from the receiving cavity.

[0019] In the above technical solution, by setting the first overlapping part to overlap on the side of the step portion away from the receiving cavity, that is, the first overlapping part overlaps on the outer side of the step portion, the pole member can be covered on the shell cover along the direction from the outer side to the inner side, thereby facilitating the assembly of the pole member to the shell cover. Moreover, through the overlapping cooperation between the first overlapping part and the step portion, the pole member and the shell cover can be reliably positioned, and the cooperation between the transition structure and the shell cover is more stable during the welding process, thereby improving the welding quality of the transition structure and the shell cover.

[0020] In some embodiments, the pole member is covered at the open end, and the connecting part is welded to the housing.

[0021] In the above technical solution, the shell cover can be omitted, and the structure of the shell can be simplified.

[0022] In some embodiments, the end of the connector near the housing has a second overlapping portion that overlaps the open end of the housing.

[0023] In the above technical solution, the overlapping joint is used to achieve the matching and positioning, which improves the assembly efficiency and ensures the stability of the fit between the transition structure and the shell during welding, thus improving the welding quality.

[0024] In some embodiments, the housing includes two first sidewalls spaced apart along a second direction and two second sidewalls spaced apart along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The two second sidewalls are connected between the two ends of the two first sidewalls. The distance between the two first sidewalls is smaller than the distance between the two second sidewalls. The distance from the inner insulating member to the second sidewall is greater than the distance to the first sidewall. The edge of the inner insulating member near the first sidewall has a protrusion, and a first gap is formed between the protrusion and the first sidewall.

[0025] In the above technical solution, the electrode component can have a larger size in the thickness direction of the housing. This is beneficial in two ways: firstly, it can increase the 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 can increase the size of the connection and mating position between the electrode body and the adapter structure, thereby increasing the connection reliability between the electrode body and the adapter structure.

[0026] In some embodiments, the insulating support further includes a second support portion extending from the first support portion toward the active material coating portion to isolate the electrode component and the active material coating portion. A sub-cavity is formed between the second support portion and the electrode component. A through hole communicating with the sub-cavity is formed on the second support portion. A conductive portion extends into the sub-cavity through the through hole and connects to the electrode body.

[0027] In the above technical solution, the insulating support, by providing a second support portion, can block the active material coating portion and the electrode post component, thereby reducing the risk of conductive short circuit and improving the reliability of the battery cell. Furthermore, the conductive portion that partially extends into the sub-cavity can also be surrounded by the second support portion and separated from the casing, thereby reducing the risk of short circuit between the conductive portion and the casing, further improving the reliability of the battery cell.

[0028] In some embodiments, the tab portion includes tab pieces, and the minimum spacing between the protrusion and the insulating support is less than or equal to the sum of the thicknesses of 3-5 tab pieces.

[0029] In the above technical solution, while effectively preventing assembly interference between the inner insulating component and the insulating support, the protrusion can reduce the risk of damaged tabs being inserted into the second gap and making electrical contact with the transition structure or the casing, thereby improving the reliability of the battery cell.

[0030] In some embodiments, the electrode tab includes an electrode tab piece, the electrode tab being disposed through a through hole, and the through hole having a dimension W1 of 4mm-8mm in the thickness direction of the electrode tab piece.

[0031] In the above technical solution, it is possible to ensure that the tab passes through smoothly, and the second support part can isolate the electrode post component from the active material coating part to a large extent.

[0032] In some embodiments, the second support portion includes an inclined section that extends toward the active material coating portion and is also inclined toward the central axis of the pole body. The minimum distance between the inclined section and the protrusion constitutes the minimum distance between the insulating support and the protrusion.

[0033] In the above technical solution, by setting an inclined section, the distance between the insulating support and the inner insulating component can be reduced more effectively, thereby reducing the risk of damaged tabs being inserted into the second gap and making electrical contact with the transition structure or the casing, thus improving the reliability of the battery cell.

[0034] In some embodiments, the second support portion includes a support section extending from the end of the inclined section near the active material coating portion toward the central axis near the pole body, and the support section is set at an obtuse angle to the inclined section, with the conductive portion partially supported on the side of the support section away from the active material coating portion.

[0035] In the above technical solution, the support section can reduce the redundancy of conductive parts outside the sub-cavity, reduce the risk of short circuits between conductive parts and active material coating or casing, and improve the reliability of the battery cell. Moreover, since the support section and the inclined section are set at an obtuse angle, the volume of the sub-cavity can be increased, which is conducive to accommodating more conductive parts and can improve the structural strength of the second support section.

[0036] In some embodiments, the electrode assembly is covered with an insulating film, and the insulating support includes a second support extending from the first support portion toward the active material coating portion, with the end of the insulating film near the electrode post member connected to the second support portion.

[0037] In the above technical solution, the insulating support and the insulating film are both made of insulating materials and can also be used to connect the insulating film, thereby simplifying the overall structure of the battery cell. Furthermore, the connection method between the insulating film and the insulating support in this structure facilitates the rapid assembly of the battery cell and improves production efficiency.

[0038] In some embodiments, the second support portion includes a straight section extending along a first direction, the end of the insulating film wrapping around and connecting to the straight section, and the extension dimension H1 of the straight section in the first direction is not less than 1.5 mm.

[0039] In the above technical solution, the shape of the straight section facilitates the connection between the end of the insulating film and the insulating support. The size of the straight section meets the size requirements for connection with the insulating film, improving the reliability of the connection between the end of the insulating film and the insulating support. For example, it meets the requirements for spot welding, and can be reliably connected by welding.

[0040] In some embodiments, the housing further includes a cover, which is disposed on the open end and has a mounting hole. The pole piece is disposed at the mounting hole, and the distance W2 between the insulating bracket and the housing body is not less than 1.2 mm.

[0041] In the above technical solution, the distance between the shell and the insulating support is sufficient. When the shell is installed over the electrode assembly covered with the insulating film, the risk of the shell end being scratched or damaged can be reduced, the integrity of the insulating film can be improved, thereby reducing the risk of short circuit between the electrode assembly and the shell, thus improving the reliability of the battery cell. At the same time, the overall structure can be made more compact, space can be avoided, and the energy density of the battery cell can be guaranteed.

[0042] In some embodiments, the wall thickness of either the inner insulating element or the insulating support is greater than 0.6 mm at each location.

[0043] In the above technical solution, the wall thickness of either the inner insulating component or the insulating support is not too small, which can meet the manufacturing requirements.

[0044] In some embodiments, the pole component includes a seal that is sealed between the pole body and the adapter structure.

[0045] In the above technical solution, the pole component itself has sealing capability, so there is no need to consider sealing issues when connecting the pole component to the housing. This reduces the sealing pressure on the housing when connecting to the pole component, thus protecting the housing.

[0046] In some embodiments, the electrode 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 receiving cavity, and the inner clamping portion is clamped on the side of the adapter structure close to the receiving cavity. A seal is clamped between the inner clamping portion and the adapter structure. The electrode component also includes an outer insulating member, which is clamped between the outer clamping portion and the adapter structure.

[0047] 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 receiving cavity, which can more effectively prevent electrolyte leakage from the mating position of the electrode body and the adapter structure and improve reliability.

[0048] 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 receiving cavity is connected to the inner clamping portion, and the other end of the through portion away from the receiving cavity is connected to the outer clamping portion to form a 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 weld mark is disposed relative to the central axis of the seal near the through portion.

[0049] In the above technical solution, by setting the pole body as described above and arranging the relative positions of the weld and the seal, the seal can be reliably clamped after the first and second parts are welded. The rebound force of the seal 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.

[0050] Secondly, embodiments of this application also provide a battery device, including a battery cell of any of the above-described solutions.

[0051] 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.

[0052] Thirdly, embodiments of this application also provide an electrical device, including a battery device according to any of the above-described solutions.

[0053] 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

[0054] 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.

[0055] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0056] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0057] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0058] Figure 4Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0059] Figure 5 for Figure 4 Enlarged view of point A shown in the image;

[0060] Figure 6 Partial cross-sectional views of a battery cell provided for other embodiments of this application;

[0061] Figure 7 A partial cross-sectional view of a battery cell provided in some embodiments of this application.

[0062] Figure label:

[0063] 1000 vehicles;

[0064] Battery device 100; controller 200; motor 300;

[0065] Box body 101; First box section 1011; Second box section 1012; Box bottom plate 1013;

[0066] Battery cell 102; First direction F1; Second direction F2; Third direction F3;

[0067] Casing 1;

[0068] Shell body 11; open end 111; closed end 112; first side wall 113; second side wall 114;

[0069] 12; 121; 122;

[0070] Receiving cavity 13;

[0071] pole piece 2;

[0072] The pole body 21; the central axis L of the pole body; the first part 21a; the second part 21b;

[0073] Inner clamping part 211; outer clamping part 212; through part 213; central axis L1 of through part;

[0074] Adapter structure 22; Connecting part 221; First overlapping part 2211; Second overlapping part 2212; Perforation 222;

[0075] Seal 23;

[0076] Inner insulating component 24; protrusion 241; inner end 24a; outer end 24b; outer insulating component 25;

[0077] Electrode assembly 3; conductive part 31; tab part 311; active material coating part 32;

[0078] Insulating bracket 4; First bracket part 41; Second bracket part 42; Through hole 43;

[0079] Inclined section 421; Support section 422; Straight section 423;

[0080] 5. Insulating film; 6. Solder mark;

[0081] First gap G1; second gap G2; sub-cavity G3. Detailed Implementation

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] In this application, "multiple" means two or more, including two.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] The materials of the casing include, but are not limited to, aluminum, steel, plastic, or other materials resistant to electrolyte corrosion.

[0096] In some battery cells of related technologies, terminals are set on the casing, and electrode assemblies inside the casing extend with tabs. The tabs are welded to the terminals to achieve electrode output. The tabs are typically composed of many stacked and welded tab sheets. To facilitate the installation of the terminals and the welding between the terminals and the tabs, the length of the tabs cannot be too short. After assembly, the tabs often form redundant bends between the terminals and the electrode assemblies. Due to the thinness of the tab sheets, there is a possibility of breakage in the bend area of ​​the tabs. Damaged tab sheets may extend to short-circuit with the casing, affecting the reliability of the battery cell.

[0097] In view of this, this application proposes a battery cell, which includes: a housing, a terminal post component, and an electrode assembly. The housing defines a receiving cavity. The terminal post component is disposed on the housing and includes a terminal post body and a connecting structure. The connecting structure surrounds the terminal post body and is connected to the housing, and the connecting structure is insulated from the terminal post body. The electrode assembly includes an active material coating portion disposed in the receiving cavity and a conductive portion connected between the active material coating portion and the terminal post body. The conductive portion includes an electrode tab portion connected to the active material coating portion. The terminal post component further includes an inner insulating member, which is disposed on the connecting structure and located on the side of the connecting structure facing the receiving cavity. The inner insulating member has a protrusion protruding in the direction of the receiving cavity. The end of the inner insulating member closer to the terminal post body is the inner end of the inner insulating member, and the end of the inner insulating member away from the terminal post body is the outer end of the inner insulating member. The protrusion is disposed relative to the inner end of the inner insulating member and closer to the outer end of the inner insulating member. In the above technical solution, by setting an inner insulating component, the connection between the transfer structure and the electrode assembly can be isolated to a certain extent, thereby reducing the risk of short circuit between the electrode assembly and the transfer structure. Furthermore, by setting a protrusion at or near the edge of the inner insulating component, when some electrode tabs in the tab part are damaged and extend towards the edge of the transfer structure or the housing, the protrusion can be used to block these electrode tabs, reducing the probability of electrical conduction between the electrode tab part and the transfer structure or the housing, thereby improving the reliability of the battery cell.

[0098] 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.

[0099] 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.

[0100] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] Reference Figure 3 and Figure 4 , Figure 4This 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 an electrode post 2. The electrode post 2 is disposed on the housing 1 and includes an electrode post body 21 and a connecting structure 22. The connecting structure 22 surrounds the electrode post body 21 and is connected to the housing 1. The connecting structure 22 is insulated from the electrode post body 21. "The connecting structure 22 is insulated from the electrode post body 21" means that the electrode post body 21 and the connecting structure 22 are connected, and the electrode post body 21 and the connecting structure 22 are separated by an insulating material, and the electrode post body 21 and the electrode post body 22 do not conduct electricity to each other.

[0110] The structure of the housing 1 is not limited, and the manner in which the "pole post component 2 is disposed on the housing 1 and the adapter structure 22 is connected to the housing 1" is diverse. In the embodiments of this application, the polarity of the pole post component 2 is not limited, and it can be a cathode pole or an anode pole.

[0111] For example, combining Figure 3 and Figure 4 The housing 1 includes a body 11 and a cover 12. One end of the body 11 in the first direction F1 is an open end 111, and the other end is a closed end 112. The cover 12 is placed over the open end 111 and has mounting holes. The terminal post 2 is located at the mounting holes, and the adapter structure 22 is connected to the cover 12. The open end 111 refers to the solid portion at the end of the body 11, defining an opening area. 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.

[0112] For example, the housing 1 includes a body 11, one end of which is an open end 111 in the first direction F1. The pole piece 2 is placed on the open end 111, and the adapter structure 22 is connected to the open end 111 of the body 11. Another example is that the housing 1 includes a body 11 and a cover 12, one end of which is an open end 111 in the first direction F1, and the other end is a closed end 112. The cover 12 is placed on the open end 111, and the closed end 112 has a mounting hole. The pole piece 2 is located at the mounting hole, and the adapter structure 22 is connected to the closed end 112 of the body 11. For example, the housing 1 includes a body 11 and a cover 12. The two ends of the body 11 in the first direction F1 are open ends 111. The cover 12 is two and is respectively covered on both sides of the open ends 111. At least one cover 12 has a mounting hole. The pole post component 2 is provided at the mounting hole. The adapter structure 22 is connected to the cover 12.

[0113] Reference Figure 4 and Figure 5The housing 1 defines a receiving cavity 13. The battery cell 102 also includes an electrode assembly 3. The electrode assembly 3 includes an active material coating portion 32 disposed within the receiving cavity 13 and a conductive portion 31 connecting the active material coating portion 32 and the terminal body 21. The conductive portion 31 includes a tab portion 311 connected to the active material coating portion 32. The connection between the tab portion 311 and the terminal body 21 can be direct or indirect. When directly connected, the conductive portion 31 consists only of the tab portion 311. When indirectly connected, the conductive portion 31 can consist of the tab portion 311 and other conductive components. The electrode assembly 3 can be in a wound or stacked form. The portion of the current collector coated with the active material layer in the electrode assembly 3 forms the active material coating portion 32, and the portion not coated with the active material layer forms the tab portion 311. The tab portion 311 includes multiple tab sheets.

[0114] refer to Figure 4 and Figure 5 The pole piece 2 also includes an inner insulating member 24, which is disposed on the transition structure 22 and located on the side of the transition structure 22 facing the receiving cavity 13. The inner insulating member 24 has a protrusion 241 protruding in the direction of the receiving cavity 13. The end of the inner insulating member 24 near the pole piece body 21 is the inner end 24a of the inner insulating member 24, and the end of the inner insulating member 24 away from the pole piece body 21 is the outer end 24b of the inner insulating member 24. The protrusion 241 is relatively close to the inner end 24a of the pole piece body 21. The inner end 24a of the insulating member 24 is located close to the outer end 24b of the inner insulating member 24. That is, in the direction perpendicular to the central axis L of the pole body 21, the distance from the protrusion 241 to the inner end 24a of the inner insulating member 24 is greater than the distance from the protrusion 241 to the outer end 24b of the inner insulating member 24. In other words, the distance between the protrusion 241 and the inner end 24a of the inner insulating member 24 is relatively small.

[0115] The phrase "inner insulating component 24 is provided on the transition structure 22" means that the inner insulating component 24 is supported by the transition structure 22, but the connection method between the two is not limited. For example, the inner insulating component 24 and the transition structure 22 can be processed into a non-detachable integral structure, such as the inner insulating component 24 being injection molded onto the transition structure 22; or the inner insulating component 24 and the transition structure 22 can be processed into two separate structures and assembled and connected, such as the inner insulating component 24 being injection molded separately and snapped together with the transition structure 22. This can simplify the processing technology, reduce processing costs, and ensure that both structures have good structural strength.

[0116] Therefore, by providing the inner insulating component 24, it can effectively block the connection between the transfer structure 22 and the electrode assembly 3 to a certain extent, thereby reducing the risk of short circuit between the electrode assembly 3 and the transfer structure 22. Furthermore, by providing a protrusion 241 at or near the edge of the inner insulating component 24, when some electrode tabs in the tab portion 311 are damaged and extend towards the edge of the transfer structure 22 or the housing 1, the protrusion 241 can be used to block these electrode tabs, reducing the probability of electrical conduction between the tab portion 311 and the transfer structure 22 or the housing 1, thereby improving the reliability of the battery cell 102.

[0117] For example, the protrusion 241 may be located at the outer end 24b of the inner insulating member 24 (e.g., refer to...). Figures 4-6 That is, the protrusion 241 is located at the end of the inner insulating member 24 away from the central axis L. The protrusion 241 is provided at the outer end 24b of the inner insulating member 24 and protrudes from the outer end 24b of the inner insulating member 24 toward the receiving cavity 13. Therefore, it can have a larger blocking range, further reducing the probability of electrical conduction between the tab 311 and the adapter structure 22 or the housing 1, thereby improving the reliability of the battery cell 102. Alternatively, by way of example, a certain gap can also be left between the protrusion 241 and the outer end 24b of the inner insulating member 24 (e.g., refer to...). Figure 7 ).

[0118] In some embodiments, combined with Figure 4 and Figure 5 The shell 1 includes a shell body 11, one end of the shell body 11 in the first direction F1 is an open end 111, the active material coating part 32 is disposed inside the shell body 11, the pole member 2 is disposed on the side of the active material coating part 32 in the first direction F1 near the open end 111, and a first gap G1 is formed between the protrusion 241 and the shell body 11.

[0119] 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.

[0120] Therefore, by providing a first gap G1 between the protrusion 241 and the housing 11, during the processing of the battery cell 102, when installing the electrode post component 2 onto the housing 1, the problem of assembly interference between the inner insulating component 24 and the housing 11 can be avoided. Furthermore, the provision of the protrusion 241 can reduce the risk of damaged electrode tabs being inserted into the first gap G1 and electrically connected to the adapter structure 22 or the housing 11, thereby improving the reliability of the battery cell 102.

[0121] In some embodiments, combined with Figure 4 and Figure 5 The battery cell 102 also includes an insulating support 4, which is disposed in the housing 1 and located in the receiving cavity 13. The insulating support 4 includes a first support portion 41 disposed in a first gap G1. The first support portion 41 and the inner insulating member 24 are spaced apart to form a second gap G2 between the first support portion 41 and the inner insulating member 24.

[0122] The phrase "insulating bracket 4 is provided on housing 1" means that the insulating bracket 4 is supported by housing 1, but the connection method between the two is not limited. For example, it can be processed into a non-removable integral structure with a certain component of housing 1, such as the inner insulating component 24 being injection molded onto a certain component of housing 1; or it can be processed into two separate structures with a certain component of housing 1 and assembled and connected, such as by snap-fit.

[0123] To facilitate the installation of the terminal post component 2, the inner insulation component 24 can be machined to a smaller size. This results in a relatively larger first gap G1. In the above embodiment, by providing an insulating bracket 4 and using the first bracket portion 41 to fill a portion of the first gap G1, the risk of damaged electrode tabs entering the first gap G1 and making electrical connections with the adapter structure 22 or the housing 11 can be further avoided, thereby improving the reliability of the battery cell 102. Furthermore, by providing a second gap G2 between the first bracket portion 41 and the inner insulation component 24, assembly interference between the inner insulation component 24 and the insulating bracket 4 can be avoided when installing the terminal post component 2 into the housing 1. The protrusion 241 reduces the risk of damaged electrode tabs inserting backwards into the second gap G2 and making electrical connections with the adapter structure 22 or the housing 11, thereby improving the reliability of the battery cell 102.

[0124] In some embodiments, combined with Figure 4 and Figure 5 The distance W0 between the first support portion 41 and the inner insulating member 24 is 0.1mm-0.5mm. That is to say, the size of the second gap G2 is between 0.1mm-0.5mm, for example, it can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm, etc.

[0125] Therefore, the second gap G2 is not too large, which can better reduce the risk of the damaged tab being inserted into the second gap G2 and making electrical contact with the transition structure 22 or the housing 11. Moreover, the second gap G2 is not too small, which can better avoid the problem of assembly interference between the inner insulating component 24 and the insulating support 4.

[0126] In some embodiments, combined with Figure 4 and Figure 5The adapter structure 22 has a connecting portion 221 extending beyond the coverage area of ​​the inner insulating member 24 in a direction away from the pole body 21. The adapter structure 22 is connected to the housing 1 via the connecting portion 221. At least a portion of the first support portion 41 is located on the side of the connecting portion 221 near the receiving cavity 13. In this way, the inner insulating member 24 is relatively small in size and is recessed relative to the adapter structure 22. When the pole member 2 is installed from the outside to the inside of the housing 1, the inner insulating member 24 will not cause interference. Therefore, the pole member 2 can be installed from the outside to the inside of the housing 1.

[0127] In the above technical solution, since the adapter structure 22 has a connecting portion 221 that extends beyond the coverage area of ​​the inner insulating member 24 in a direction away from the electrode body 21, it indicates that the inner insulating member 24 does not exceed the coverage area of ​​the adapter structure 22. This allows the electrode member 2 to be installed into the housing 1 along the direction from the outside to the inside of the housing 1, thus facilitating the installation of the electrode member 2. Furthermore, since at least a portion of the first support portion 41 is located on the side of the connecting portion 221 near the receiving cavity 13, it indicates that the connecting portion 221 covers at least a portion of the first support portion 41. This allows the first support portion 41 to, to a certain extent, prevent the risk of electrical conduction caused by contact between the damaged electrode tab and the adapter structure 22, thereby improving the reliability of the battery cell 102.

[0128] In some embodiments, combined with Figure 4 and Figure 5 The housing 1 also includes a cover 12, which covers the open end 111. The cover 12 has a mounting hole 121, and the pole piece 2 is located at the mounting hole 121. The connecting part 221 is welded to the cover 12, and the insulating bracket 4 is installed on the cover 12. As a result, the overall size of the pole piece 2 is relatively smaller than that of the cover 12, which helps to shorten the length of the tab 311, reduce the space occupied by the tab 311 in the receiving cavity 13, and reduce problems such as damage and inversion caused by the redundancy of the tab 311. Moreover, by installing the insulating bracket 4 on the cover 12, it is convenient to install the insulating bracket 4. For example, the insulating bracket 4 can be fixed on the cover 12 first, and then the cover 12 and the housing 11 can be assembled together.

[0129] For example, refer to Figure 4 and Figure 5 The end of the connecting portion 221 near the cover 12 has a first overlapping portion 2211, and the end of the cover 12 near the pole member 2 has a stepped portion 122. The first overlapping portion 2211 overlaps on the side of the stepped portion 122 away from the receiving cavity 13.

[0130] Therefore, by setting the first overlapping part 2211 to overlap the side of the step part 122 away from the receiving cavity 13, it can be explained that the first overlapping part 2211 overlaps the outer side of the step part 122, so that the pole member 2 can be covered on the shell cover 12 in the direction from the outer side to the inner side, thereby facilitating the assembly of the pole member 2 to the shell cover 12. Moreover, through the overlapping cooperation between the first overlapping part 2211 and the step part 122, the pole member 2 and the shell cover 12 can be reliably positioned, and the cooperation between the transition structure 22 and the shell cover 12 is more stable during the welding process, thereby improving the welding quality of the transition structure 22 and the shell cover 12. Furthermore, since the adapter structure 22 has a connecting portion 221 that extends beyond the coverage area of ​​the inner insulating member 24 in a direction away from the pole body 21, the size of the inner insulating member 24 is relatively small and it is recessed relative to the adapter structure 22. Therefore, when the pole member 2 is covered with the cover 12 from the outside to the inside to achieve overlapping, the recessed inner insulating member 24 will not cause assembly interference, which is conducive to the smooth assembly of the pole member 2.

[0131] For example, the adapter structure 22 is welded to the cover 12 at least through the first overlap 2211, and the weld mark formed by the adapter structure 22 and the cover 12 extends along the direction from the first overlap 2211 to the step 122. That is, welding can be performed along the direction from the outside of the housing 1 to the inside of the housing 1, thereby facilitating the welding operation.

[0132] In some embodiments, combined with Figure 6 The pole piece 2 is covered by the open end 111 of the housing 11, and the connecting part 221 is welded to the housing 11. Therefore, compared with the above solution, the housing cover 12 can be omitted, and the structure of the housing 1 can be simplified. In this embodiment, the insulating support 4 can be selected as needed. That is, the insulating support 4 can be provided or not. When the insulating support 4 is provided, the insulating support 4 can be supported on the housing 11, etc.

[0133] For example, combined Figure 6The end of the connecting part 221 near the shell 11 has a second overlapping part 2212, which overlaps the open end 111 of the shell 11 (i.e. overlaps the outside of the open end 111 in the first direction F1). The transition structure 22 can overlap and cooperate with the shell 11. In this way, the transition structure 22 can be welded to the shell 11 at the second overlapping part 2212 by end welding or side welding, so that the fit and positioning can be achieved through overlapping, improving assembly efficiency, and ensuring the fit and stability of the transition structure 22 and the shell 11 during welding, which is conducive to improving welding quality. Furthermore, since the adapter structure 22 has a connecting portion 221 that extends beyond the coverage area of ​​the inner insulating member 24 in a direction away from the pole body 21, the size of the inner insulating member 24 is relatively small and it is recessed relative to the adapter structure 22. Therefore, when the pole member 2 is covered with the housing 11 from the outside to the inside to achieve overlapping, the recessed inner insulating member 24 will not cause assembly interference, which is conducive to the smooth assembly of the pole member 2.

[0134] In some embodiments, reference Figures 3-5 The casing 11 includes two first sidewalls 113 spaced apart along the second direction F2, and two second sidewalls 114 spaced apart along the third direction F3. The first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other. The two second sidewalls 114 are connected between the two ends of the two first sidewalls 113. That is, the ends of the two first sidewalls 113 that are close to each other are connected by one second sidewall 114, and the other ends of the two first sidewalls 113 that are close to each other are connected by the other second sidewall 114. The distance between the two first sidewalls 113 is smaller than the distance between the two second sidewalls 114. That is, the size of the casing 11 along the third direction F3 is larger than the size of the casing 11 along the second direction F2. 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 perpendicular to each other. The distance from the inner insulating member 24 to the second side wall 114 is greater than the distance from the inner insulating member 24 to the first side wall 113. The edge of the inner insulating member 24 near the first side wall 113 has a protrusion 241, and a first gap G1 is formed between the protrusion 241 and the first side wall 113.

[0135] Therefore, the electrode component 2 can have a larger size in the thickness direction (i.e., the second direction F2) of the housing 11. This is beneficial in two ways: firstly, it can increase the conductive area of ​​the electrode body 21 in the electrode component 2, thereby increasing the conductive area between the electrode body 21 and the electrode assembly 3, as well as the conductive area between the electrode body 21 and the electrode plate; secondly, it can increase the size of the connection and mating position between the electrode body 21 and the adapter structure 22, thereby increasing the connection reliability between the electrode body 21 and the adapter structure 22.

[0136] In some embodiments, reference Figures 3-5 The insulating support 4 also includes a second support portion 42, which extends from the first support portion 41 toward the active material coating portion 32 to isolate the active material coating portion 32 from the terminal post 2. A sub-cavity G3 is formed between the second support portion 42 and the terminal post 2. A through hole 43 communicating with the sub-cavity G3 is formed on the second support portion 42. The conductive portion 31 extends into the sub-cavity G3 through the through hole 43 and connects to the terminal post body 21. Thus, by providing the second support portion 42, the insulating support 4 can block the active material coating portion 32 and the terminal post 2, thereby reducing the risk of conductive short circuit and improving the reliability of the battery cell 102. Moreover, the conductive portion 31, which partially extends into the sub-cavity G3, can also be surrounded by the second support portion 42 and separated from the casing 11, thereby reducing the risk of short circuit between the conductive portion 31 and the casing, further improving the reliability of the battery cell 102.

[0137] In some embodiments, reference Figure 4 and Figure 5 The tab portion 311 includes tabs. The minimum distance L1 between the protrusion 241 and the insulating support 4 is less than or equal to the sum of the thicknesses of 3-5 tab layers, such as the sum of the thicknesses of three, four, or five tab layers. Therefore, while effectively preventing assembly interference between the inner insulating component 24 and the insulating support 4, the protrusion 241 reduces the risk of a damaged tab being inserted into the second gap G2 and electrically connected to the adapter structure 22 or the casing 11, thereby improving the reliability of the battery cell 102. For example, the thickness of a single tab layer can be 0.013 mm, and the sum of the thicknesses of four tab layers is approximately 0.013 mm × 4 ≈ 0.05 mm. The minimum distance L1 between the protrusion 241 and the insulating support 4 can be 0.05 mm.

[0138] In some embodiments, reference Figure 4 and Figure 5The tab portion 311 includes a tab piece, which passes through the through hole 43. The through hole 42 has a dimension W1 of 4mm-8mm in the thickness direction of the tab piece. For example, W1 can be 4mm, 5mm, 6mm, 7mm, or 8mm. This ensures that the tab portion 311 can pass through smoothly while also allowing the second support portion 42 to largely isolate the electrode post component 2 from the active material coating portion 32.

[0139] In some embodiments, reference Figure 4 and Figure 5 The second support portion 42 includes an inclined section 421. The inclined section 421 extends towards the active material coating portion 32 and also inclines towards the central axis L of the electrode body 21. The minimum distance between the inclined section 421 and the protrusion 241 constitutes the minimum distance L1 between the insulating support 4 and the protrusion 241. Therefore, by providing the inclined section 421, the distance between the insulating support 4 and the inner insulating member 24 can be reduced more effectively, thereby reducing the risk of damaged electrode tabs inserting into the second gap G2 and making electrical contact with the transition structure 22 or the casing 11, thus improving the reliability of the battery cell 102.

[0140] In some embodiments, reference Figure 4 and Figure 5 The second support portion 42 includes a support section 422, which extends from the end of the inclined section 421 near the active material coating portion 32 toward the central axis L near the electrode body 21. The support section 422 is set at an obtuse angle to the inclined section 421, and the conductive portion 31 is partially supported on the side of the support section 422 away from the active material coating portion 32. Therefore, the support section 422 can reduce the redundancy of the conductive portion 31 outside the sub-cavity G3, reduce the risk of short circuits between the conductive portion 31 and the active material coating portion 32 or the casing 1, and improve the reliability of the battery cell 102. Furthermore, since the support section 422 is set at an obtuse angle to the inclined section 421, the volume of the sub-cavity G3 can be increased, facilitating the accommodation of more conductive portions 31 and improving the structural strength of the second support portion 42.

[0141] For example, the via 43 can be defined by the portion of the support section 422 away from the inclined section 421. When the dimension W1 of the via 42 in the thickness direction of the tab is 4mm-8mm, for example, W1 can be 4mm, 5mm, 6mm, 7mm, or 8mm, the support section 422 can provide a more effective shaping effect on the conductive part 31 and reduce the redundancy of the conductive part 31 outside the sub-cavity G3.

[0142] In some embodiments, reference Figure 4 and Figure 5The electrode assembly 3 is covered with an insulating film 5. When there are multiple electrode assemblies 3, the insulating film 5 can simultaneously cover the active material coating portions 32 of multiple electrode assemblies 3. The insulating support 4 includes a second support portion 42 extending from the first support portion 41 toward the active material coating portion 32. The end of the insulating film 5 near the electrode post 2 is connected to the second support portion 42. For example, the insulating support 4 and the insulating film 5 can be bonded, welded, etc. Thus, the insulating support 4 and the insulating film 5 are both insulating materials and can also be used to connect the insulating film 5, thereby simplifying the overall structure of the battery cell 102. Moreover, the connection method of the insulating film 5 and the insulating support 4 in the above structure facilitates the rapid assembly of the battery cell 102 and improves production efficiency.

[0143] For example, during the production process of the battery cell 102, the insulating support 4 can be installed on the shell cover 12 to obtain the shell cover assembly. Then, the electrode tabs of the electrode assembly 3 are pre-welded into the tab portion 311 in the form of a plate. The electrode assembly 3 is installed onto the shell cover assembly so that the tab portion 311 passes through the through hole 42. Then, the insulating film 5 is wrapped around the active material coating portion 32 of the electrode assembly 3, and the end of the insulating film 5 is connected to the insulating support 4. After that, the shell body 11 is fitted onto the electrode assembly 3, and the shell body 11 is welded to the shell cover 12. Then, the terminal post 2 is placed outside the shell cover 12 and welded to the tab portion 311. After that, the terminal post 2 is rotated 90° and placed on the shell cover 12. The adapter structure 22 is welded to the shell cover 12. After that, a sealing test is performed.

[0144] In some embodiments, reference Figure 4 and Figure 5 The second support portion 42 includes a straight section 423 extending along a first direction F1. The end of the insulating film 5 is wrapped around and connected to the straight section 423. The extension dimension H1 of the straight section 423 in the first direction F1 is not less than 1.5mm, that is, greater than or equal to 1.5mm, for example, it can be 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, etc. Therefore, the shape of the straight section 423 facilitates the connection between the end of the insulating film 5 and the insulating support 4, and the size of the straight section 423 meets the size requirements for connection with the insulating film 5, improving the reliability of the connection between the end of the insulating film 5 and the insulating support 4. For example, it meets the requirements for spot welding, and can be reliably connected by welding.

[0145] In some embodiments, reference Figure 4 and Figure 5When the housing 1 includes a cover 12, which covers the open end 111 of the housing body 11 and has a mounting hole 121, and the electrode post 2 is located at the mounting hole 121, the distance W2 between the insulating support 4 and the housing body 11 is not less than 1.2mm, that is, greater than or equal to 1.2mm, for example, it can be 1.2mm, 1.5mm, 2.8mm, 2mm, etc. Therefore, the distance between the housing body 11 and the insulating support 4 is sufficient. When the housing body 11 is fitted over the electrode assembly 3 covered with the insulating film 5, the risk of the end of the housing body 11 being scratched or damaged by the insulating film 5 can be reduced, the integrity of the insulating film 5 can be improved, thereby reducing the risk of short circuit connection between the electrode assembly 3 and the housing 1, thus improving the reliability of the battery cell 102. At the same time, it can also improve the compactness of the overall structure, avoid space waste, and ensure the energy density of the battery cell 102.

[0146] For example, when the edge of the cover 12 near the receiving cavity 12 near the body 11 has a chamfer, the difference between W2 and the chamfer can be further set to be greater than or equal to 1.2mm, which can more effectively reduce the risk of the end of the body 11 scratching or damaging the insulating film 5. For example, when the thickness of the cover 12 is 1.5mm, the chamfer can be 0.3mm, and when the thickness of the cover 12 is 2mm, the chamfer can be 0.5mm.

[0147] In some embodiments, reference Figure 4 and Figure 5 The wall thickness of either the inner insulating component 24 or the insulating support 4 is greater than 0.6 mm at all points. For example, dimensions T1, T2, T3, etc., shown in the figure are all greater than 0.6 mm. Therefore, the wall thickness of either the inner insulating component 24 or the insulating support 4 is not too small, which can meet the manufacturability requirements and avoid uneven surfaces such as pits during injection molding.

[0148] refer to Figure 4 and Figure 5 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 1. This reduces the sealing pressure on the housing 1 during connection with the electrode post component 2, thus protecting the housing 1. For example, the seal 23 can be a rubber ring, etc.

[0149] 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, or an insulating layer may also be provided. The hardness of the insulating element is greater than that of the sealing element 23, and the sealing function is mainly achieved by the elastic sealing element 23. For example, the insulating element can be an insulating plastic part, which can be injection molded separately or injection molded integrally with the pole body 21.

[0150] The connection method between the pole body 21 and the adapter structure 22 is not limited. For example, the pole body 21 can clamp the adapter structure 22 (e.g. Figure 4 and Figure 5 (as shown), or it could be a transition structure 22 that clamps the pole body 21 (e.g. Figure 7 (As shown).

[0151] In some embodiments, reference Figure 4 The electrode 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 receiving cavity 13), and the inner clamping portion 211 clamps the inner side of the adapter structure 22 (i.e., the side close to the receiving cavity 13). The sealing member 23 is clamped between the inner clamping portion 211 and the adapter structure 22. The electrode component 2 also includes an outer insulating member 25, which is clamped between the outer clamping portion 212 and the adapter structure 22. Thus, by clamping the adapter structure 22 with the electrode body 21, the sealing member 23 can seal from the side close to the receiving cavity 13, which can more effectively prevent electrolyte leakage from the mating position of the electrode body 21 and the adapter structure 22, improving reliability.

[0152] 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.

[0153] In some embodiments, reference Figure 4The 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 end of the through part 213 away from the receiving cavity 13 is connected to the outer clamping part 212 to form a 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 weld mark 6 is provided relative to the sealing member 23 near the central axis L1 of the through part 213.

[0154] Therefore, by setting the pole body 21 as described above and arranging the relative positions of the weld mark 6 and the seal 23, the seal 23 can be reliably clamped after the first part 21a and the second part 21b are welded. The rebound force of the seal 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, facilitating welding operations and ensuring welding quality.

[0155] 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.

[0156] 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.

[0157] 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.

[0158] For example, combined Figure 2 The 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.

[0159] 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. Therefore, 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. Thus, 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.

[0160] Specifically, when the terminal component 2 of the battery cell 102 is located on the side of the housing 1 facing the bottom plate 1013 of the box, the battery cell 102 is in an inverted state, and the depressurized products are ejected in the direction away from the passenger compartment, which is safer; when the terminal component 2 of the battery cell 102 is located on the side of the housing 1 away from the bottom plate 1013 of the box, the battery cell 102 is in an upright state, and the electrolyte is not easy to leak.

[0161] 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.

[0162] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0163] 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 shell defines the receiving cavity; An electrode component is disposed on the housing and includes an electrode body and a connecting structure. The connecting structure surrounds the electrode body and is connected to the housing. The connecting structure is insulated from the electrode body. An electrode assembly includes an active material coating portion disposed within the receiving cavity, and a conductive portion connecting the active material coating portion and the electrode body, the conductive portion including an electrode tab connected to the active material coating portion; The pole component further includes an inner insulating member, which is disposed on the adapter structure and located on the side of the adapter structure facing the receiving cavity. The inner insulating member has a protrusion protruding in the direction of the receiving cavity. The end of the inner insulating member closer to the pole body is the inner end of the inner insulating member, and the end of the inner insulating member away from the pole body is the outer end of the inner insulating member. The protrusion is disposed relative to the inner end of the inner insulating member and closer to the outer end of the inner insulating member.

2. The battery cell according to claim 1, characterized in that, The protrusion is located at the outer end of the inner insulating member and protrudes from the outer end of the inner insulating member toward the receiving cavity.

3. The battery cell according to claim 1, characterized in that, The housing includes a shell body, one end of which is an open end in a first direction. The active substance coating portion is disposed inside the shell body, and the pole member is disposed on the side of the active substance coating portion in the first direction near the open end. A first gap is formed between the protrusion and the shell body.

4. The battery cell according to claim 3, characterized in that, The battery cell further includes an insulating support, which is disposed in the housing and located within the receiving cavity. The insulating support includes a first support portion disposed within the first gap, and the first support portion is spaced apart from the inner insulating member to form a second gap between the first support portion and the inner insulating member.

5. The battery cell according to claim 4, characterized in that, The distance W0 between the first support portion and the inner insulating component is 0.1mm-0.5mm.

6. The battery cell according to claim 4, characterized in that, The adapter structure has a connecting portion extending beyond the coverage area of ​​the inner insulation member in a direction away from the pole body. The adapter structure is connected to the housing through the connecting portion, and at least a portion of the first support portion is located on the side of the connecting portion closer to the receiving cavity.

7. The battery cell according to claim 6, characterized in that, The housing also includes a cover, which is disposed on the open end. The cover has a mounting hole, the pole member is disposed at the mounting hole, the connecting part is welded to the cover, and the insulating bracket is installed on the cover.

8. The battery cell according to claim 7, characterized in that, The end of the connecting portion near the cover has a first overlapping portion, and the end of the cover near the pole member has a stepped portion, with the first overlapping portion overlapping the side of the stepped portion away from the receiving cavity.

9. The battery cell according to claim 6, characterized in that, The pole component is covered at the open end, and the connecting part is welded to the shell.

10. The battery cell according to claim 9, characterized in that, The end of the connecting part near the shell has a second overlapping part, which overlaps the open end of the shell.

11. The battery cell according to claim 3, characterized in that, The shell includes two first sidewalls spaced apart along a second direction and two second sidewalls spaced apart along a third direction. The first direction, the second direction, and the third direction are perpendicular to each other. The two second sidewalls are connected between the two ends of the two first sidewalls. The distance between the two first sidewalls is less than the distance between the two second sidewalls. The distance from the inner insulating member to the second sidewall is greater than the distance to the first sidewall. The edge of the inner insulating member near the first sidewall has the protrusion. The protrusion and the first sidewall form the first gap.

12. The battery cell according to claim 4, characterized in that, The insulating support further includes a second support portion, which extends from the first support portion toward the active material coating portion to isolate the electrode component and the active material coating portion. A sub-cavity is formed between the second support portion and the electrode component. A through hole communicating with the sub-cavity is formed on the second support portion. The conductive portion extends into the sub-cavity through the through hole and is connected to the electrode body.

13. The battery cell according to claim 12, characterized in that, The tab portion includes tab pieces, and the minimum distance L1 between the protrusion and the insulating support is less than or equal to the sum of the thicknesses of 3-5 layers of tab pieces.

14. The battery cell according to claim 12, characterized in that, The electrode portion includes an electrode tab, which is inserted through the through hole. The through hole has a dimension W1 of 4mm-8mm in the thickness direction of the electrode tab.

15. The battery cell according to claim 12, characterized in that, The second support portion includes an inclined section that extends toward the active material coating portion and also tilts toward the central axis of the pole body. The minimum distance between the inclined section and the protrusion constitutes the minimum distance L1 between the insulating support and the protrusion.

16. The battery cell according to claim 15, characterized in that, The second support portion includes a support section that extends from the end of the inclined section near the active material coating portion toward the central axis of the electrode body, and the support section is set at an obtuse angle to the inclined section. The conductive portion is partially supported on the side of the support section away from the active material coating portion.

17. The battery cell according to claim 4, characterized in that, The electrode assembly is covered with an insulating film, and the insulating support includes a second support extending from the first support portion toward the active material coating portion. The end of the insulating film near the electrode post is connected to the second support portion.

18. The battery cell according to claim 17, characterized in that, The second support portion includes a straight section that extends along the first direction. The end of the insulating film wraps around and is connected to the straight section. The extension dimension H1 of the straight section in the first direction is not less than 1.5 mm.

19. The battery cell according to claim 17, characterized in that, The housing also includes a cover, which is disposed on the open end. The cover has a mounting hole, and the pole component is disposed at the mounting hole. The distance W2 between the insulating bracket and the housing body is not less than 1.2 mm.

20. The battery cell according to claim 4, characterized in that, The wall thickness of either the inner insulating component or the insulating support is greater than 0.6 mm at each point.

21. 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.

22. The battery cell according to claim 21, 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 receiving cavity, and the inner clamping part is clamped on the side of the adapter structure close to the receiving cavity. The sealing member is clamped between the inner clamping part and the adapter structure. The electrode post component also includes an outer insulating member, which is clamped between the outer clamping part and the adapter structure.

23. The battery cell according to claim 22, 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 receiving cavity is connected to the inner clamping portion. The other end of the through portion away from the receiving cavity is connected to the outer clamping portion to form a 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 weld mark is disposed relative to the central axis of the sealing member near the through portion.

24. A battery device, characterized in that, Includes the battery cell according to any one of claims 1-23.

25. An electrical appliance, characterized in that, Includes the battery device according to claim 24.

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