A single battery, a battery pack and an electric device

Abstract

The application relates to the battery technical field and discloses a single battery, a battery pack and a power utilization device. The single battery comprises a shell, a top cover sheet, a pole, an electrode assembly and an insulation protection piece. The top cover sheet is connected with the shell, and the top cover sheet has an assembly hole. The pole is arranged in the assembly hole, and the pole has a connecting hole. The electrode assembly is arranged in the shell, and the electrode assembly comprises a battery core main body and a tab part. The tab part comprises a first folding part and a second folding part. The first folding part is connected with the battery core main body and the second folding part. The second folding part is arranged in the first direction. The insulation protection piece is arranged in the shell and connected with the second folding part. The insulation protection piece has a limiting channel. The second folding part is arranged in the limiting channel and the connecting hole. The end of the second folding part, which is away from the first folding part, is welded with the pole and seals the connecting hole. The single battery is welded and sealed by directly inserting the tab part into the connecting hole of the pole, so that the assembly yield and product reliability are improved.

Description

Technical Field

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

[0002] The tabs of a single battery cell need to be electrically connected to the terminals on the top cover. Existing technology usually uses connecting tabs to weld the bent tabs to the terminals. Since the tabs need to be bent and adapted to different terminal positions to ensure welding accuracy, they are often designed to be too long. However, excessively long tabs are prone to being inserted backwards into the electrode assembly during the casing process due to redundancy, which may cause a short circuit risk in the electrode assembly and affect the assembly yield and product reliability of the single battery cell. Utility Model Content

[0003] With the aim of at least solving one of the technical problems existing in the prior art, this application aims to provide a single cell, a battery pack, and an electrical device, wherein the single cell improves assembly yield and product reliability.

[0004] To achieve the above objectives, in a first aspect, this application provides a single-cell battery. The single-cell battery has a first orientation and includes a housing, a top cover, terminals, an electrode assembly, and an insulating protective member. The top cover is connected to the housing and has a through mounting hole. The terminals pass through the mounting hole and have a connecting hole extending along the first orientation. The electrode assembly is disposed within the housing and includes a cell body and a tab portion. The tab portion includes a first folding portion and a second folding portion. The first folding portion is connected between the cell body and the second folding portion, and the second folding portion extends along the first orientation. The insulating protective member is disposed within the housing and connected to the second folding portion. The insulating protective member has a limiting channel, and the second folding portion passes through the limiting channel and the connecting hole. One end of the second folding portion away from the first folding portion is welded to the terminal and seals the connecting hole.

[0005] In some embodiments, the single cell further has a second direction, the first direction and the second direction are perpendicular to each other, the end of the second gathering portion away from the first gathering portion is a connecting end, the connecting end and the hole wall of the connecting hole are welded to form a first weld mark; along the second direction, the size of the first weld mark is larger than the size of the second gathering portion.

[0006] In some embodiments, at least a portion of the insulating protective element is inserted into the connection hole, and the insulating protective element is connected to the pole post.

[0007] In some embodiments, the insulating protective member includes a first protective portion and a second protective portion, the first protective portion being located on one side of the second gathering portion and the second protective portion being located on the other side of the second gathering portion along the second direction, and the limiting channel is defined between the first protective portion and the second protective portion.

[0008] In some embodiments, the first protective part includes a first protective sheet, the second protective part includes a third protective sheet, and the limiting channel is defined between the first protective sheet and the third protective sheet; the first protective sheet and the third protective sheet are disposed opposite to each other along the second direction, both the first protective sheet and the third protective sheet are connected to the second gathering part, both the first protective sheet and the third protective sheet extend along the first direction, one end of the first protective sheet near the connecting hole is inserted into the connecting hole, and one end of the third protective sheet near the connecting hole is inserted into the connecting hole.

[0009] In some embodiments, the single battery cell further has a second direction, the first direction and the second direction are perpendicular to each other, the first protection part further includes a second protection sheet connected to the first protection sheet, the second protection part further includes a fourth protection sheet connected to the third protection sheet, the second protection sheet is inclined relative to the first direction, the fourth protection sheet is inclined relative to the first direction, the first gathering part has a first outer side and a second outer side facing the electrode post, the first outer side and the second outer side are respectively provided on both sides of the second gathering part along the second direction, and the first outer side and the second outer side are connected to the second gathering part and the cell body, the second protection sheet is attached to the first outer side, and the fourth protection sheet is attached to the second outer side.

[0010] In some embodiments, the connecting hole has a first hole segment and a second hole segment that are interconnected. The second hole segment is located on the side of the first hole segment closer to the main body of the battery cell, and the cross-sectional area of ​​the second hole segment is larger than that of the first hole segment. The second folding portion passes through the second hole segment and the first hole segment. The end of the first protective plate near the second hole segment is inserted into the second hole segment, and the end of the third protective plate near the second hole segment is inserted into the second hole segment.

[0011] In some embodiments, the single battery cell further includes a seal; the outer peripheral side of the electrode post has a first mating surface, the first mating surface being inclined relative to the first direction; the seal is disposed around the electrode post, the wall of the assembly hole has a second mating surface, the second mating surface being inclined relative to the first direction, the entire seal is located within the assembly hole, and the seal is sealed to the first mating surface and the second mating surface respectively.

[0012] In some embodiments, the outer peripheral side of the seal has a third mating surface that abuts against the first mating surface, and the inner peripheral side of the seal has a fourth mating surface that abuts against the second mating surface; the electrode post has a first surface disposed close to the battery cell body; Wherein, the angle between the first mating surface and the first surface is a first acute angle, the angle between the second mating surface and the first surface is a second acute angle, the angle between the third mating surface and the first surface is a third acute angle, and the angle between the fourth mating surface and the first surface is a fourth acute angle, and the first acute angle, the second acute angle, the third acute angle, and the fourth acute angle are equal.

[0013] In some embodiments, the single cell further includes an inner insulating member and an outer insulating member; the sealing member has a first end face and a second end face disposed opposite to each other in the first direction; the inner insulating member includes a first insulating portion and a second insulating portion, the first insulating portion being connected to one side of the top cover sheet and located within the housing, the second insulating portion protruding from the side of the first insulating portion away from the cell body, and at least a portion of the second insulating portion being located within the mounting hole and surrounding the electrode post, and the second insulating portion being connected to the first end face; the outer insulating member includes a third insulating portion and a fourth insulating portion, the third insulating portion being connected to the side of the top cover sheet away from the first insulating portion in the first direction, the fourth insulating portion being connected to the side of the third insulating portion near the electrode post, and the fourth insulating portion being located within the mounting hole and surrounding the electrode post, and the fourth insulating portion being connected to the second end face.

[0014] In some embodiments, the top cover sheet has a receiving groove on the side near the cell body that communicates with the mounting hole; the first insulating part includes a first insulating section and a second insulating section, the second insulating section is received in the receiving groove, the second insulating part is connected to the end of the second insulating section near the electrode post, and the first insulating section is connected to the end of the second insulating section away from the electrode post.

[0015] In some embodiments, the first insulating segment has a third end face disposed near the cell body, and along the first direction, the electrode is located on the side of the third end face away from the cell body.

[0016] In some embodiments, the top cover sheet includes a sheet body and a protrusion, the sheet body connects the housing and the protrusion, the mounting hole penetrates the sheet body and the protrusion along the first direction, and the protrusion protrudes from the sheet body on the side away from the cell body; a connecting groove is formed between the third insulating portion and the fourth insulating portion, and at least a portion of the protrusion is inserted into the connecting groove.

[0017] In some embodiments, the third insulating portion has a receiving groove on the side away from the cell body in the first direction, the receiving groove having a first groove bottom surface located on the side of the top cover plate away from the cell body, and the first groove bottom surface having a through hole; the pole includes a column portion and a flange portion, the outer peripheral side of the column portion has the first mating surface, the column portion passes through the through hole, the flange portion is connected to the column portion, at least a portion of the flange portion is accommodated in the receiving groove, and the flange portion is connected to the first groove bottom surface.

[0018] In some embodiments, the column portion includes a first column and a second column. The flange portion is connected to the first column and located on the side of the first column away from the cell body. The second column is connected to the first column and located on the side of the first column close to the cell body. The connecting hole is provided in the second column. The first column has a through hole communicating with the connecting hole. The cross-sectional area of ​​the through hole is larger than the cross-sectional area of ​​the connecting hole. The single cell also has a reference plane. The first direction is perpendicular to the reference plane. The orthographic projection of the hole wall of the connecting hole along the first direction onto the reference plane is entirely within the contour range of the orthographic projection of the hole wall of the through hole along the first direction onto the reference plane.

[0019] Secondly, this application also provides a battery pack, the battery pack comprising any of the individual batteries described above.

[0020] Thirdly, this application also provides an electrical device, which includes a single battery as described in any of the above claims, or includes a battery pack as described above.

[0021] Compared with the prior art, the advantages of the single-cell battery described in this application are as follows: (1) By setting an insulating protective component with a limiting channel and connecting the second gathering part to the insulating protective component, the insulating protective component can protect and shape the tab part to gather the tab part into a shape that fits the insertion into the connection hole, reducing the difficulty of aligning the second gathering part and the connection hole, so that the tab part of the electrode assembly can be directly inserted into the connection hole of the electrode post after being guided by the limiting channel for welding and achieving a sealed connection. The sealed connection can prevent foreign objects such as dust from entering the cell through the connection hole, and can also prevent the electrolyte in the casing from leaking from the connection hole. Since the second gathering part is set to extend along the first direction and is directly inserted into the connection hole of the electrode post for welding after being guided by the limiting channel, the tab part does not need to be set to be too long to meet the bending path and welding space, thereby shortening the length of the tab part, reducing material redundancy, reducing the risk of reverse insertion of the tab part, and improving the assembly yield and product reliability.

[0022] (2) This application eliminates the traditional connecting piece, which simplifies the connection structure between the tab and the post, reduces the welding process, and helps to reduce material costs and improve the efficiency of automated production. At the same time, the insulating protective component also has an insulating function, which can prevent the tab from short-circuiting with the surrounding components and further improve battery safety. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a single battery cell provided in an embodiment of this application; Figure 2 This is a cross-sectional view of a single battery cell provided in an embodiment of this application; Figure 3 yes Figure 2 Enlarged view of point A; Figure 4 This is a schematic diagram comparing the dimensions of the first solder mark and the electrode tab provided in the embodiments of this application; Figure 5 This is a top view of a single battery cell provided in an embodiment of this application; Figure 6 yes Figure 5 Enlarged view of point B; Figure 7 This is a schematic diagram showing the connection between the electrode assembly and the insulating protective component provided in the embodiments of this application; Figure 8 yes Figure 7 Enlarged diagram of point C.

[0024] Figure 9 This is a schematic diagram of the top cover assembly provided in an embodiment of this application; Figure 10 This is a cross-sectional view of the top cover assembly provided in an embodiment of this application; Figure 11 This is a schematic diagram showing the acute angle formed by the various mating surfaces and the first surface provided in the embodiments of this application; Figure 12 This is a schematic diagram of the structure of the top cover sheet provided in the embodiment of this application; Figure 13 This is a cross-sectional view of the top cover plate provided in the embodiment of this application; Figure 14 This is a cross-sectional view of the seal provided in the embodiment of this application; Figure 15 This is a schematic diagram of the structure of the internal insulation component provided in the embodiments of this application; Figure 16 This is a cross-sectional view of the internal insulation component provided in the embodiments of this application; Figure 17 This is a schematic diagram of the structure of the external insulation component provided in the embodiments of this application; Figure 18This is a cross-sectional view of the external insulation component provided in the embodiments of this application; Figure 19 This is a schematic diagram of the pole structure provided in the embodiments of this application; Figure 20 This is a top view of the pole provided in the embodiment of this application; In the diagram, 1 represents the shell; 2. Top cover assembly; 21. Top cover plate; 22. Seal; 23. Inner insulating component; 24. Outer insulating component; 210. Assembly hole; 211. Plate body; 212. Protrusion; 221. Third mating surface; 222. Fourth mating surface; 223. First end face; 224. Second end face; 231. First insulating part; 232. Second insulating part; 241. Third insulating part; 242. Fourth insulating part; 243. Connecting groove; 2101. Second mating surface; 2111. Receiving groove; 2311. First insulating section; 2312. Second insulating section; 2313. Clearance groove; 2411. Receiving groove; 23111. Third end face; 24111. Bottom surface of first groove; 24112. Through hole; 24113. Side surface of first groove; 3. Pole post; 31. Post body; 32. Flanged part; 301. First mating surface; 302. First surface; 311. First post; 312. Second post; 3111. Through hole; 3120. Connecting hole; 31201. First hole section; 31202. Second hole section; 4. Electrode assembly; 41. Battery cell body; 42. Electrode tab; 421. First gathering part; 422. Second gathering part; 4211. First outer surface; 4212. Second outer surface; 4221. Connecting end; 5. Insulating protective component; 50. Limiting channel; 51. First protective part; 52. Second protective part; 511. First protective plate; 512. Second protective plate; 521. Third protective plate; 522. Fourth protective plate; 1000, First solder mark; 2000, Reference Plane; Z, first direction; Y, second direction; X, third direction. Detailed Implementation

[0025] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0026] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0029] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] 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 foregoing drawings of this application are intended to cover non-exclusive inclusion.

[0031] 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.

[0032] In this application, "multiple" means two or more (including two).

[0033] In this application, a single battery cell may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application are not limited to this. A single battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to this either. Single batteries are generally classified into three types according to their packaging method: cylindrical single batteries, square single batteries, and pouch single batteries, and the embodiments of this application are not limited to this either.

[0034] For example, a single battery cell typically includes a casing, an electrode assembly, and an electrolyte. The casing houses the cell assembly and the electrolyte, and has at least one positive electrode post and at least one negative electrode post. The electrode assembly includes one or more cells, which are formed by stacking or winding positive electrode plates, negative electrode plates, and separators.

[0035] The positive electrode generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. 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 a positive electrode tab. Multiple positive electrode tabs are stacked together and form an electrical connection with the positive electrode post. For example, the multiple stacked positive electrode tabs can be directly welded to the positive electrode post to form an electrical connection; or, the electrode assembly can also include a positive electrode adapter piece. The multiple stacked positive electrode tabs are welded to one end of the positive electrode adapter piece, and the other end of the positive electrode adapter piece is welded to the positive electrode post, so that the positive electrode tabs and the positive electrode post form an electrical connection.

[0036] The negative electrode generally includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated on the negative current collector. 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 a negative electrode tab. Multiple negative electrode tabs are stacked together and form an electrical connection with the negative electrode post. For example, the stacked negative electrode tabs can be directly welded to the negative electrode post to form an electrical connection; alternatively, the electrode assembly may also include a negative electrode adapter piece. The stacked negative electrode tabs are welded to one end of the negative electrode adapter piece, and the other end of the negative electrode adapter piece is welded to the negative electrode post, so that the negative electrode tabs and the negative electrode post form an electrical connection. The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0037] Meanwhile, a single battery cell mainly relies on the movement of metal ions between the positive and negative electrode plates to function. Taking a lithium-ion battery as an example, the material of the positive electrode current collector can be aluminum, and the material of the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The material of the negative electrode current collector can be copper, and the material of the negative electrode active material layer can be carbon or silicon, etc. During charging and discharging, Li+ ions repeatedly insert and extract between the two electrodes: during charging, Li+ ions extract from the positive electrode, pass through the electrolyte, and insert into the negative electrode, which is in a lithium-rich state; the opposite occurs during discharging.

[0038] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, batteries, as the power source, play an irreplaceable and crucial role. Among these, batteries, as core components of new energy vehicles, have high requirements in terms of both energy density and reliability.

[0039] In the manufacturing process of a single-cell battery in related technologies, an active material layer is coated onto a current collector, which is then cut to obtain an electrode assembly consisting of a current collector coated with the active material layer (denoted as the active material coated portion) and a current collector without the active material layer (denoted as the tab). The positive and negative electrode assemblies and a separator are then sequentially stacked or wound to obtain an electrode assembly. Multiple tabs are stacked in the electrode assembly to form a tab portion. The casing of the single-cell battery has terminals, and the surface of the terminal facing the active material coated portion is the inner end face of the terminal. During manufacturing, the tab portion is typically directly welded to the inner end face of the terminal, or indirectly welded to the inner end face of the terminal through an adapter plate, to ensure normal charging and discharging operations.

[0040] In related technologies, a single-cell battery includes a casing, a top cover assembly, and an electrode assembly. The casing has a receiving chamber with an opening. The electrode assembly is inserted into the receiving chamber through the opening. The top cover assembly is placed over the opening and welded to the casing. The top cover assembly has terminals. The electrode assembly has tabs, which include a first converged portion formed by multiple tabs, and a second converged portion formed by convergence and connection. The second converged portion can be directly or indirectly electrically connected to the terminals. In the assembly process of this type of single-cell battery, the second converged portion is usually first directly or indirectly welded to the terminals on the top cover, then the electrode assembly is installed into the casing, and finally the top cover is welded to the casing. Because the tabs need to be directly or indirectly welded to the terminals on the top cover before being installed into the casing, and the position and size of the terminals on the top cover vary, the length of the entire tab is usually set relatively long to accommodate the terminal settings of the top cover and ensure ease of welding. However, the inventors discovered that when the tab is long, the second gathering part is prone to inverted insertion due to redundancy, which affects the reliability of the single cell.

[0041] like Figures 1 to 20 As shown, in a first aspect, some embodiments of this application provide a single-cell battery having a first direction Z. The single-cell battery includes a housing 1, a top cover assembly 2, a terminal post 3, an electrode assembly 4, and an insulating protective component 5.

[0042] The top cover assembly 2 includes a top cover plate 21. The top cover plate 21 is connected to the housing 1 and has a through mounting hole 210. The electrode post 3 passes through the mounting hole 210 and has a through connection hole 3120 along the first direction Z. The electrode assembly 4 is disposed inside the housing 1 and includes a cell body 41 and an electrode tab 42. The electrode tab 42 includes a first folding portion 421 and a second folding portion 422. The first folding portion 421 is connected between the cell body 41 and the second folding portion 422 (i.e., the first folding portion 421 is located in the cell body 41). Between the first and second gathering portions 421, and both the first gathering portion 421 and the battery cell body 41 and the second gathering portion 422 are connected, the second gathering portion 422 extends along the first direction Z; the insulating protective member 5 is disposed in the housing 1 and connected to the second gathering portion 422, the insulating protective member 5 has a limiting channel 50, the second gathering portion 422 passes through the limiting channel 50 and the connecting hole 3120, and one end of the second gathering portion 422 away from the first gathering portion 421 is welded to the pole post 3 and seals the connecting hole 3120.

[0043] Based on this technical solution, by setting an insulating protective component 5 with a limiting channel 50 and connecting the second gathering part 422 to the insulating protective component 5, the insulating protective component 5 can protect and shape the electrode tab to fit into the connection hole 3120, reducing the alignment difficulty between the second gathering part 422 and the connection hole 3120. This allows the electrode tab 42 of the electrode assembly 4 to be directly inserted into the connection hole 3120 of the electrode post 3 after being guided by the limiting channel 50 for welding and sealing connection. The sealing connection can prevent dust and other foreign objects from entering the electrode assembly 3 through the connection hole 3120. Inside the battery, it also prevents the electrolyte in the casing 1 from leaking from the connection hole 3120. Since the second gathering part 422 is extended along the first direction Z and guided by the limiting channel 50, it is directly inserted into the connection hole 3120 of the pole post 3 for welding. Therefore, the tab part 42 does not need to be set to be too long to meet the bending path and welding space. This arrangement in this application is conducive to shortening the overall length of the tab part, which not only helps to reduce the cost of the tab part, but also helps to improve the inverted insertion problem caused by the redundancy of the tab part, so as to improve the reliability of the single battery, improve the assembly yield and product reliability.

[0044] This application eliminates the traditional connecting piece, which simplifies the connection structure between the tab 42 and the terminal post 3, reduces welding processes, and helps to reduce material costs and improve automated production efficiency; at the same time, the insulating protection component 5 also has an insulating function, which can prevent short circuits between the tab and surrounding components, further improving battery safety.

[0045] It should be noted that the housing 1 is used to encapsulate the electrode assembly 4 and electrolyte components; the housing 1 can be of various shapes and sizes, such as cuboid or hexagonal prism, and the shape of the housing 1 can be determined according to the specific shape and size of the battery cell. The housing 1 can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, and aluminum alloy.

[0046] It should be noted that the top cover 21 refers to a component that covers the opening of the housing 1 to isolate the internal space of the housing 1 from the external environment. The shape of the top cover 21 can be adapted to the shape of the housing 1 to achieve isolation. The cover can be made of a material with a certain hardness and strength (such as aluminum alloy).

[0047] It should be noted that terminal 3 is the conductive component connecting the internal electrodes of the battery to the external circuitry. The material of terminal 3 typically possesses high conductivity, corrosion resistance, and mechanical strength, such as aluminum (Al) or aluminum alloys, copper (Cu) or nickel-plated copper. In some high-voltage applications, terminal 3 may also employ a copper-aluminum composite structure. Furthermore, the surface of terminal 3 may be coated with a layer such as nickel or silver to enhance corrosion resistance and weldability, ensuring long-term stable battery operation.

[0048] The cell body 41 is the part of the cell coated with active material, which can assist in the intercalation and deintercalation of metal ions during the charging and discharging process. The tab 42 is a metal structure that electrically connects the cell body 41 and the terminal 3. It is not coated with active material. The terminal 3 is electrically connected to the cell body 41 through the tab 42 so that the charging and discharging operation of the battery can be carried out.

[0049] It should be noted that, in the embodiments of this application, the battery cell body 41 includes a current collector and an active material layer disposed on the current collector, and the tab portion 42 is electrically connected to the current collector. The battery cell body 41 is divided into a positive active material coating portion and a negative active material coating portion. The positive active material coating portion includes the portion of the positive current collector coated with the positive active material layer, and the negative active material coating portion includes the portion of the negative current collector coated with the negative active material layer. The tab portion 42 is divided into a positive tab portion 42 and a negative tab portion 42. The positive tab is electrically connected to the positive current collector and the positive terminal 3, and the negative tab is electrically connected to the negative current collector and the negative terminal 3.

[0050] The tab 42 and the electrode post 3 are electrically connected by welding, and the electrical connection position is the welding position between the tab 42 and the electrode post 3. Furthermore, the welding method between the tab 42 and the electrode post 3 is not limited; for example, laser welding can be used. Depending on the position, angle, or structure of the welding area, vertical welding, inclined welding, lap welding, or edge sealing welding can be selected. For simplicity, the following description will use the example of the tab 42 and the electrode post 3 being electrically connected by welding, with the welding position being the electrical connection position between the tab 42 and the electrode post 3.

[0051] The tab portion 42 includes multiple tabs, which are electrically connected to the current collector but are not coated with active material. These tabs can be directly die-cut using a current collector. The ends of the multiple tabs closest to the active material coating portion converge (i.e., gather towards each other) to form a first convergence portion 421. The ends of the multiple tabs furthest from the active material coating portion converge and connect to form a second convergence portion 422. The first convergence portion 421 connects the second convergence portion 422 to the active material coating portion. In some optional examples, the active material coating portion and the tabs can be a single piece; for example, for the positive electrode, it can be an integrally formed aluminum foil, or for the negative electrode, it can be an integrally formed copper foil.

[0052] In the above technical solution, when multiple tabs form the first convergence portion 421, they only converge (i.e., move closer to each other) but are not connected. However, when multiple tabs form the second convergence portion 422, they not only converge but also connect into a single structure. For example, multiple tabs can be connected into a single plate structure by welding (e.g., ultrasonic welding) to form the second convergence portion 422. Alternatively, multiple tabs can be converged and connected to form the second convergence portion 422 by means of conductive adhesive bonding, etc., which will not be elaborated here.

[0053] It should be noted that, in the embodiments of this application, the electrode tabs are divided into positive electrode tabs and negative electrode tabs. The positive electrode tabs that need to be gathered together are stacked together and ultrasonically pre-welded to form the second gathered portion 422 of the positive electrode. This reduces the interlayer gaps, allowing the loosely packed multiple positive electrode tabs to form a plate structure with a certain rigidity. Similarly, the negative electrode tabs that need to be gathered together are stacked together and ultrasonically pre-welded to form the second gathered portion 422 of the negative electrode. This also reduces the interlayer gaps, allowing the loosely packed multiple negative electrode tabs to form a plate structure with a certain rigidity.

[0054] In the above technical solution, "the ends of multiple tabs near the active material coating part are gathered to form a first gathered part 421, and the ends of multiple tabs away from the active material coating part are gathered and connected to form a second gathered part 422" is intended to illustrate that: along the extension direction of the tabs, the first gathered part 421 and the second gathered part 422 are arranged sequentially in the direction away from the active material coating part, and the specific positions of the first gathered part 421 and the second gathered part 422 are not limited, that is, it is not required that the first gathered part 421 is close to the active material coating part, nor is it required that the second gathered part 422 is far from the active material coating part.

[0055] In the embodiments of this application, the first direction Z is the extension direction of the tabs after they are folded up. It mainly characterizes the direction in which the tabs are arranged relative to the active material coating after they are folded up. Specifically, the first direction Z is the axial direction of the pole post 3. For example, refer to Figures 1 to 20 When the electrode post 3 is located at the top of the casing 1, the tabs extend above the active material coating. Whether the tabs extend vertically upwards or obliquely upwards, the vertically upward direction is the first direction Z, which is also the height direction of the single cell. The thickness direction of the single cell can be the second direction Y, and the length direction of the single cell can be the third direction X. The first direction Z, the second direction Y, and the third direction X are all perpendicular to each other. Alternatively, for example, the electrode post 3 can also be located at the bottom of the casing 1, with the tabs extending downwards from the active material coating. In this case, the vertically downward direction can be the first direction Z, which will not be elaborated further here.

[0056] The insulating protective component 5 is made of a high-temperature resistant, insulating, and electrolyte-resistant material, preferably polyimide (PI), polyphenylene sulfide (PPS), polyetheretherketone (PEEK), polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), or modified materials thereof. These materials can maintain structural integrity and electrical insulation performance under high-temperature baking, long-term service, and electrolyte immersion environments, ensuring safe and reliable connections.

[0057] The top cover assembly 2 also includes a seal 22, an inner insulator 23, and an outer insulator 24.

[0058] See Figures 3 to 11 The end of the second gathering part 422 away from the first gathering part 421 is the connecting end 4221. The connecting end 4221 and the hole wall of the connecting hole 3120 are welded to form a first weld mark 1000. Along the second direction Y, the size k of the first weld mark 1000 is greater than the size d of the second gathering part 422.

[0059] This application limits the size k of the first weld mark 1000 formed by welding the connecting end 4221 to the wall of the connecting hole 3120 in the second direction Y to be greater than the size d of the second gathering portion 422. That is, the weld mark width is greater than the thickness of the second gathering portion 422. This indicates that the molten pool fully expands and fills the gap between the second gathering portion 422 and the connecting hole 3120 during the welding process, forming a reliable bond. This ensures the weld sealing between the electrode ear 42 and the electrode post 3, preventing electrolyte vapor or gas from leaking through the weld and avoiding risks such as leakage and airtightness failure due to poor sealing.

[0060] In this application, the first weld mark 1000 refers to the fusion bonding area formed by welding (such as laser welding) between the connecting end 4221 of the second gathering portion 422 and the wall of the connecting hole 3120 of the pole post 3; along the second direction Y (i.e., perpendicular to the first direction Z), the size of the first weld mark 1000 refers to the fusion width of the weld in the second direction Y after welding, also known as the "fusion width". Specifically, the fusion width refers to the lateral expansion dimension of the metal joint formed by the conductive material (tab) and the pole post 3 after local melting, fusion and solidification during welding in the second direction Y; when the fusion width dimension is greater than the thickness of the second gathering portion 422 itself (i.e., the original dimension along the second direction Y), it indicates that the weld pool has sufficiently expanded to the edge of the connecting hole 3120 and formed a covering and filling with the hole wall. Further, as Figures 3 to 6 As shown, the connecting end 4221 and the wall of the connecting hole 3120 are laser welded to form a first weld mark 1000. The dimension k (i.e. weld width) of the first weld mark 1000 along the second direction Y is greater than the thickness d of the second gathering part 422 to ensure that the welding area is fully fused and the connecting hole 3120 is sealed.

[0061] Optionally, the welding trajectory of the first weld mark 1000 can be of various shapes, including but not limited to straight lines, wavy lines, spiral lines, or combinations thereof.

[0062] Preferably, the trajectory of the first weld mark 1000 is a multi-overlapping wavy or spiral trajectory. Compared with the traditional straight welding trajectory, the wavy or spiral trajectory can increase the welding path length in the same space, expand the coverage of the molten pool, and form a wider equivalent fusion area (i.e., a larger equivalent weld width) near the connecting hole 3120, and increase the bonding area between the electrode tab and the hole wall. The multi-overlapping design further ensures that there are no omissions or weak points in the welding area, achieving full filling and continuous sealing of the connecting hole 3120.

[0063] At least a portion of the insulating protective element 5 is inserted into the connecting hole 3120, and the insulating protective element 5 is connected to the pole post 3. By inserting at least a portion of the insulating protective element 5 into the connecting hole 3120 of the pole post 3, the insulating protective element 5 can shape and rigidly support the second gathering part 422, preventing the second gathering part 422 from spreading out or deforming; the protective part inserted into the connecting hole 3120 serves as a guide structure, which can guide the second gathering part 422 and the connecting hole 3120 to be accurately aligned during the assembly process, so that the second gathering part 422 can be smoothly inserted into the connecting hole 3120 along the limiting channel 50, reducing the assembly difficulty of the pole tab 42 and the connecting hole 3120, and improving the welding yield of the pole tab 42 and the pole post 3.

[0064] The insulating protective element 5 includes a first protective part 51 and a second protective part 52. The first protective part 51 is located on one side of the second gathering part 422 along the second direction Y, and the second protective part 52 is located on the other side of the second gathering part 422 along the second direction Y. A limiting channel 50 is defined between the first protective part 51 and the second protective part 52.

[0065] By providing a first protective part 51 and a second protective part 52 on both sides of the second gathering part 422, the first protective part 51 and the second protective part 52 together define the limiting channel 50 to clamp and fix the second gathering part 422, prevent the second gathering part 422 from shifting and deforming, and improve the shape stability of the electrode tab.

[0066] Optionally, the insulating protective component 5 can adopt various structural forms to adapt to different battery designs and process requirements. Specifically, the insulating protective component 5 can be an integral structure or a split structure. When the insulating protective component 5 is an integral structure, the first protective part 51 and the second protective part 52 are integrally formed, and the limiting channel 50 is formed as a through hole 3111 penetrating the insulating protective component 5, for example, by injection molding, molding, or stamping processes to form a single component. When the insulating protective component 5 is a split structure, the first protective part 51 and the second protective part 52 are independent components, which are clamped on both sides of the second gathering part 422 by subsequent assembly methods, forming the limiting channel 50. For example, after the two independent insulating sheets are attached to the tabs from both sides, they are fixed to the tab part 42 or the housing 1 by adhesive, snap-fit, or heat fusion. This structure allows for step-by-step assembly after the tabs are pre-welded, which is suitable for space-constrained or automated line post-assembly scenarios and has higher process flexibility.

[0067] The first protective part 51 includes a first protective piece 511, and the second protective part 52 includes a third protective piece 521. A limiting channel 50 is defined between the first protective piece 511 and the third protective piece 521. The first protective piece 511 and the third protective piece 521 are arranged opposite each other along the second direction Y. Both the first protective piece 511 and the third protective piece 521 are connected to the second gathering part 422. Both the first protective piece 511 and the third protective piece 521 extend along the first direction Z. One end of the first protective piece 511 near the connecting hole 3120 is inserted into the connecting hole 3120, and one end of the third protective piece 521 near the connecting hole 3120 is inserted into the connecting hole 3120.

[0068] By clamping and connecting the second folding portion 422 along the second direction Y with the first protective plate 511 and the third protective plate 521, the second folding portion 422 can be fixed on both sides, preventing deformation or displacement. Both protective plates extend along the first direction Z, and their ends are inserted into the connecting hole 3120, forming a double-pilot guide structure. During assembly, this structure synchronously guides the second folding portion 422 and the connecting hole 3120 for accurate alignment, reducing assembly difficulty. Simultaneously, the insertion of both the first and third protective components into the connecting hole 3120 expands the insulation coverage of the insulating protective component 5, further preventing short circuits between the electrode tab 42 and surrounding components, and further improving battery safety.

[0069] The first protection part 51 further includes a second protection piece 512 connected to the first protection piece 511, and the second protection part 52 further includes a fourth protection piece 522 connected to the third protection piece 521. The second protection piece 512 is inclined relative to the first direction Z, and the fourth protection piece 522 is inclined relative to the first direction Z. The first gathering part 421 has a first outer side 4211 and a second outer side 4212 facing the pole post 3. The first outer side 4211 and the second outer side 4212 are respectively provided on both sides of the second gathering part 422 along the second direction Y, and the first outer side 4211 and the second outer side 4212 are connected to both the second gathering part 422 and the battery cell body 41. The second protective sheet 512 is attached to the first outer surface 4211, and the fourth protective sheet 522 is attached to the second outer surface 4212.

[0070] By attaching the second protective sheet 512 and the fourth protective sheet 522 to the first outer side 4211 and the second outer side 4212 of the first gathering part 421 respectively, and cooperating with the double-sided fixing of the first protective sheet 511 and the second protective sheet 512 to the second gathering part 422, the insulating protective member 5 can be adapted to the three-dimensional shape of the electrode tab 42, realizing continuous coverage and attachment fixation from the first gathering part 421 to the second gathering part 422, enhancing the structural support of the insulating protective member 5 for the electrode tab 42, and improving the overall gathering stability of the electrode tab 42; at the same time, the attachment of the second protective sheet 512 and the fourth protective sheet 522 can also expand the connection area between the insulating protective member 5 and the electrode tab 42, and improve the connection reliability between the insulating protective member 5 and the electrode tab 42.

[0071] See Figures 9 to 11 ,and Figures 19 to 20 The connecting hole 3120 has a first hole segment 31201 and a second hole segment 31202 that are interconnected. The second hole segment 31202 is located on the side of the first hole segment 31201 that is close to the cell body 41, and the cross-sectional area of ​​the second hole segment 31202 is larger than the cross-sectional area of ​​the first hole segment 31201. The second gathering part 422 passes through the second hole segment 31202 and the first hole segment 31201. The end of the first protective piece 511 that is close to the second hole segment 31202 is inserted into the second hole segment 31202. The end of the third protective piece 521 that is close to the second hole segment 31202 is inserted into the second hole segment 31202.

[0072] By setting a first hole segment 31201 and a second hole segment 31202 with different cross-sectional areas, while ensuring that the smaller first hole segment 31201 can achieve small-gap sealing welding with the second gathering part 422, the larger second hole segment 31202 can provide a larger accommodating space for the inserted insulating protective part 5, avoiding assembly difficulties caused by structural interference; the second hole segment 31202, as an inlet cavity, is conducive to the smooth introduction of the protective sheet and the electrode ear, reducing the alignment difficulty and improving the assembly efficiency.

[0073] In this application, the cross-sectional area refers to the area enclosed by a cross-section of the connecting hole 3120 on a plane perpendicular to its axial extension direction (i.e., the first direction Z). Specifically, when the connecting hole 3120 extends along the first direction Z, its cross-sectional area is the area enclosed by the hole profile measured on a cross-section perpendicular to that direction, used to characterize the size of the space at that location where the electrode lug or protective component can pass through. For example, if the connecting hole 3120 is a square hole, its cross-sectional area is the area of ​​the square or rectangular cross-section at the corresponding location, that is, the area value obtained by multiplying the length and width of the cross-section. If the connecting hole 3120 is a circular through hole 3111, then the cross-sectional area is the area of ​​the circular cross-section at the corresponding location; if it is an irregularly shaped hole, then it is the geometric area enclosed by the profile of that cross-section.

[0074] In this application, the connecting hole 3120 includes a first hole segment 31201 and a second hole segment 31202. The cross-sectional area of ​​the second hole segment 31202 is larger than that of the first hole segment 31201, meaning that at their respective corresponding positions, the orifice area of ​​the second hole segment 31202 is larger than that of the first hole segment 31201. This stepped structure forms a transitional hole body from small to large, which is beneficial for realizing the functional division of sealing at the upper section and introducing at the lower section.

[0075] See Figures 9 to 11 , Figure 14 ,and Figures 19 to 20 The outer periphery of the pole post 3 has a first mating surface 301, which is inclined relative to the first direction Z; the sealing element 22 is arranged around the pole post 3, and the wall of the assembly hole 210 has a second mating surface 2101, which is inclined relative to the first direction Z; the entire sealing element 22 is located inside the assembly hole 210, and the sealing element 22 is sealed and connected to the first mating surface 301 and the second mating surface 2101 respectively.

[0076] By inclining both the first mating surface 301 on the outer periphery of the electrode post 3 and the second mating surface 2101 on the wall of the mounting hole 210, the seal 22 is located inside the mounting hole 210 and tightly fits against the two incised mating surfaces, forming a reliable conical extrusion seal structure. This prevents electrolyte leakage and improves seal durability. This conical extrusion seal structure completely accommodates the seal 22 inside the mounting hole 210, eliminating the need to occupy space within the housing 1 and avoiding interference with the layout of the electrode assembly 4. This improves the utilization rate of the internal space of the housing 1, allowing for more active material to be accommodated within the same volume, thus contributing to increased battery energy density.

[0077] It should be noted that "the sealing element 22 is sealed and connected to the first mating surface 301 and the second mating surface 2101 respectively" can be understood as: the outer peripheral side of the sealing element 22 is connected to the first mating surface 301 and forms a seal, and the inner peripheral side of the sealing element 22 is connected to the second mating surface 2101 and forms a seal.

[0078] It should be noted that the seal 22 is a key component for achieving airtight and liquid-tight connection between the terminal post 3 and the top cover. The seal 22 prevents electrolyte leakage and the entry of external moisture, air, and other impurities into the battery, ensuring the stability and safety of the internal battery environment. The seal 22 can be made of various materials, including but not limited to polyphenylene sulfide (PPS), polyamide (PA, nylon), polytetrafluoroethylene (PTFE), modified epoxy resin, and other engineering plastics or polymers with good high-temperature resistance, corrosion resistance, and insulation properties. In some embodiments, the seal 22 may also be made of an elastomeric material (such as fluororubber) to enhance the sealing fit.

[0079] The inner circumferential side of the seal 22 has a third mating surface 221 that abuts against the first mating surface 301, and the outer circumferential side of the seal 22 has a fourth mating surface 222 that abuts against the second mating surface 2101; the electrode post 3 has a first surface 302 located near the battery cell body 41; wherein, the angle between the first mating surface 301 and the first surface 302 is a first acute angle J1, the angle between the second mating surface 2101 and the first surface 302 is a second acute angle J2, the angle between the third mating surface 221 and the first surface 302 is a third acute angle J3, and the angle between the fourth mating surface 222 and the first surface 302 is a fourth acute angle J4, and the first acute angle J1, the second acute angle J2, the third acute angle J3, and the fourth acute angle J4 are equal.

[0080] This allows the seal 22 to fit more tightly with the top cover plate 21, increasing the contact area between the seal 22 and the top cover plate 21, and also allows the seal 22 to fit more tightly with the terminal post 3, further increasing the contact area between the seal 22 and the terminal post 3, thus improving the sealing performance of the individual battery cell.

[0081] It should be noted that an acute angle means: 0° < angle < 90°, such as 0.5°, 5°, 10°, 15°, 20°, 25°, 30°, 34°, 35°, 40°, 45°, 60°, 80°, 88°, 89°, etc. In other words, any value other than 0° and 90° can be selected from the range of 0° to 90°. No specific limitation is made here.

[0082] It should be noted that the angle J1 between the first mating surface 301 and the first surface 302 can be understood as the angle formed between the first oblique line formed by the intersection of the cutting surface and the first mating surface 301 and the first surface 302, for example... Figures 10 to 11 As shown, the included angle can be understood as the angle formed between the first oblique line formed by the intersection of the cutting plane parallel to the first direction Z and the second direction Y and the first mating surface 301, and the first surface 302.

[0083] Similarly, the angle J2 between the second mating surface 2101 and the first surface 302 can be understood as the angle formed between the second oblique line formed by the intersection of the cutting surface and the second mating surface 2101 and the first surface 302, for example... Figures 10 to 11 As shown, the included angle J2 can be understood as the angle formed between the second oblique line formed by the intersection of the cutting plane parallel to the first direction Z and the second direction Y and the second mating surface 2101, and the first surface 302.

[0084] Similarly, the angle J3 between the third mating surface 221 and the first surface 302 can be understood as the angle formed between the third oblique line formed by the intersection of the cutting surface and the third mating surface 221 and the first surface 302, for example... Figures 10 to 11 As shown, the included angle J3 can be understood as the angle formed between the third oblique line formed by the intersection of the cutting plane parallel to the first direction Z and the second direction Y and the third mating surface 221, and the first surface 302.

[0085] Similarly, the angle J4 between the fourth mating surface 222 and the first surface 302 can be understood as the angle formed between the fourth oblique line formed by the intersection of the cutting surface and the fourth mating surface 222 and the first surface 302, for example... Figures 10 to 11 As shown, the included angle J4 can be understood as the angle formed between the fourth oblique line formed by the intersection of the cutting plane parallel to the first direction Z and the second direction Y and the fourth mating surface 222, and the first surface 302.

[0086] See Figures 9 to 16The sealing member 22 has a first end face 223 and a second end face 224 that are oppositely disposed in the first direction Z; the inner insulating member 23 includes a first insulating part 231 and a second insulating part 232. The first insulating part 231 is connected to one side of the top cover plate 21 and is located inside the housing 1. The second insulating part 232 protrudes from the side of the first insulating part 231 away from the cell body 41. The second insulating part 232 is located in the assembly hole 210 and surrounds the pole post 3. The second insulating part 232 is connected to the first end face 223. The outer insulating member 24 includes a third insulating part 241 and a fourth insulating part 242. The third insulating part 241 is connected to the top cover plate 21 on the side opposite to the first insulating part 231 in the first direction Z. The fourth insulating part 242 is connected to the side of the third insulating part 241 near the pole post 3. The fourth insulating part 242 is located in the mounting hole 210 and is arranged around the pole post 3. The fourth insulating part 242 is connected to the second end face 224.

[0087] By setting an inner insulating member 23 and an outer insulating member 24, the assembly hole 210 area is insulated from the inside and outside of the housing 1, respectively, forming an omnidirectional insulating barrier around the pole post 3. The second insulating part 232 of the inner insulating member 23 extends into the assembly hole 210 and connects with the first end face 223 of the seal 22, and the fourth insulating part 242 of the outer insulating member 24 extends into the assembly hole 210 and connects with the second end face 224 of the seal 22. This can achieve both axial clamping of the seal 22 and insulation isolation between the top cover plate 21 and the pole post 3 within the assembly hole 210.

[0088] It should be noted that the inner insulating component 23 is an insulating part used to achieve electrical isolation between the terminal 3 and the housing 1. The inner insulating component 23 is disposed inside the housing 1 on one side, and can block the path of current conduction from the terminal 3 through the top cover plate 21 to other metal parts of the housing 1, preventing short circuits, leakage, or surface creepage, and ensuring the electrical safety of the battery in high-voltage and high-humidity environments. The material of the inner insulating component 23 can be various, including but not limited to plastics, polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), polyamide (PA, nylon), polyethylene terephthalate (PET), polypropylene (PP), epoxy resin, and other engineering plastics or polymer materials with excellent insulation properties, heat resistance, and mechanical strength. In some embodiments, glass fiber reinforced plastic may also be used to improve structural rigidity.

[0089] It should be noted that the external insulation component 24 is an insulating part used to achieve electrical isolation between the terminal post 3 and the top cover plate 21 outside the housing 1. The external insulation component 24 is located on the side of the top cover plate 21 away from the cell body 41, effectively preventing external conductive foreign objects, moisture, or dust from forming a conductive path between the terminal post 3 and the top cover, avoiding short circuits, creepage, or arc discharge, and improving the safety and environmental tolerance of the battery during use. The material of the external insulation component 24 can be various, including but not limited to plastics, polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE), polyamide (PA, nylon), polyethylene terephthalate (PET), polypropylene (PP), epoxy resin, and other engineering plastics or polymer materials with excellent insulation properties, heat resistance, and mechanical strength.

[0090] See Figures 9 to 10 , Figure 13 ,and Figures 15 to 16 The top cover plate 21 has a receiving groove 2111 that communicates with the assembly hole 210 on the side near the battery cell body 41; the first insulating part 231 includes a first insulating section 2311 and a second insulating section 2312, the second insulating section 2312 is housed in the receiving groove 2111, the second insulating part 232 is connected to the end of the second insulating section 2312 near the pole post 3, and the first insulating section 2311 is connected to the end of the second insulating section 2312 away from the pole post 3.

[0091] By providing a receiving groove 2111 in the top cover plate 21 that communicates with the assembly hole 210, and placing the second insulating section 2312 of the inner insulating member 23 in the receiving groove 2111, the receiving groove 2111 can position and stabilize the inner insulating member 23, ensuring that the second insulating part 232 accurately extends into the assembly hole 210 and reliably connects with the sealing member 22, thereby improving assembly accuracy and structural consistency.

[0092] The first direction Z is perpendicular to the reference plane 2000. A clearance groove 2313 is formed between the first insulating section 2311 and the second insulating section 2312, and the cross-sectional area of ​​the clearance groove 2313 is larger than the cross-sectional area of ​​the mounting hole 210. Furthermore, the entire hole wall contour of the mounting hole 210 along the first direction Z in the reference plane 2000 is located within the groove wall contour of the clearance groove 2313 along the first direction Z in the reference plane 2000. This arrangement provides sufficient guiding space for the insertion of the pole post 3 into the mounting hole 210, preventing interference between the inner insulating component 23 and the first insulating part 231 during the insertion of the pole post 3 into the mounting hole 210.

[0093] The first insulating section 2311 has a third end face 23111 located near the cell body 41. Along the first direction Z, the electrode post 3 is located on the side of the third end face 23111 facing away from the cell body 41. By positioning the electrode post 3 on the side of the third end face 23111 facing away from the cell body 41 of the first insulating section 2311, the bottom of the electrode post 3 does not extend into the housing 1, thus avoiding the electrode post 3 encroaching on the housing space of the cell body 41. This provides more space for the cell body 41 and helps to improve the utilization rate of the internal space of the housing 1 and the energy density of the battery.

[0094] See Figures 9 to 13 ,and Figures 17 to 18 The top cover 21 includes a main body 211 and a protrusion 212. The main body 211 connects the housing 1 and the protrusion 212. The mounting hole 210 passes through the main body 211 and the protrusion 212 along the first direction Z. The protrusion 212 protrudes from the side of the main body 211 away from the cell body 41. A connecting groove 243 is formed between the third insulating part 241 and the fourth insulating part 242. At least a portion of the protrusion 212 is inserted into the connecting groove 243.

[0095] By inserting at least part of the protrusion 212 into the connecting groove 243 of the outer insulating member 24, the top cover plate 21 and the outer insulating member 24 are connected, so that the top cover plate 21 can accurately position and structurally support the outer insulating member 24, ensuring that the fourth insulating part 242 stably surrounds the pole post 3 and is reliably connected to the sealing member 22; at the same time, the connection between the top cover plate 21 and the outer insulating member 24 can also enhance the bonding strength between the outer insulating member 24 and the top cover plate 21, and improve the connection stability.

[0096] See Figures 9 to 11 ,and Figures 17 to 20 The third insulating part 241 has a receiving groove 2411 on the side away from the main body 41 in the first direction Z. The receiving groove 2411 has a first groove bottom surface 24111, which is located on the side of the top cover plate 21 away from the main body 41. The first groove bottom surface 24111 has a through hole 24112. The pole post 3 includes a column part 31 and a flange part 32. The outer peripheral side of the column part 31 has a first mating surface 301. The column part 31 passes through the through hole 24112. The flange part 32 is connected to the column part 31. At least a portion of the flange part 32 is accommodated in the receiving groove 2411. The flange part 32 is connected to the first groove bottom surface 24111.

[0097] By placing at least a portion of the flanged portion 32 of the pole post 3 into the receiving groove 2411 of the outer insulating member 24 and connecting it with the bottom surface 24111 of the first groove, the flanged portion 32 is embedded in the third insulating member 241. This allows the groove wall of the receiving groove 2411 to provide circumferential limiting and support for the flanged portion 32, thereby improving the stability and vibration resistance of the pole post 3 installation and preventing loosening or displacement.

[0098] The receiving groove 2411 also has a first groove side surface 24113 that is connected to the bottom surface 24111 of the first groove, and the first groove side surface 24113 is connected to the flange portion 32.

[0099] In this embodiment, the flanged portion 32 is formed at one end of the column portion 31 by a riveting process. Specifically, after the column portion 31 of the pole post 3 passes through the through hole 24112 on the top cover plate 21, a radial extrusion force is applied to one end, causing the metal material to undergo plastic deformation, fold outward, and fit against the bottom of the receiving groove 2411 (i.e., the first groove bottom surface 24111) of the outer insulating component 24, forming the flanged portion 32. This riveting connection method can achieve mechanical locking between the pole post 3 and the top cover assembly 2 without additional fasteners. The process is simple, the connection is reliable, and it has good tensile strength and vibration resistance. By controlling the riveting pressure and the mold shape, the flange angle, width, and fit can be precisely controlled to ensure batch consistency. In addition, the riveted flanged portion 32 fits tightly with the receiving groove 2411, which helps to improve the structural stability between the pole post 3 and the outer insulating component 24, and provides uniform clamping force for the sealing component 22, further ensuring sealing performance.

[0100] The column portion 31 includes a first column 311 and a second column 312. A flange portion 32 is connected to the first column 311 and located on the side of the first column 311 away from the battery cell body 41. The second column 312 is connected to the first column 311 and located on the side of the first column 311 closer to the battery cell body 41. A connecting hole 3120 is provided in the second column 312. The first column 311 is provided with a through hole 3111 that communicates with the connecting hole 3120. The cross-sectional area of ​​the through hole 3111 is larger than the cross-sectional area of ​​the connecting hole 3120. The individual battery cell also has a reference plane 2000. The first direction Z is perpendicular to the reference plane 2000. The orthographic projection of the hole wall of the connecting hole 3120 along the first direction Z onto the reference plane 2000 is entirely within the outline of the orthographic projection of the hole wall of the through hole 3111 along the first direction Z onto the reference plane 2000. The reference plane 2000 can be the side of the cell body 41 facing the column portion 31 or other planes that can be projected.

[0101] By making the cross-sectional area of ​​the through hole 3111 larger than that of the connecting hole 3120, and ensuring that the contour of the hole wall of the connecting hole 3120 is completely within the contour of the through hole 3111, the through hole 3111 can reserve sufficient space around the connecting hole 3120, providing ample space for the expansion of the molten pool for welding (such as laser welding, resistance welding, etc.) between the second gathering part 422 and the hole wall of the connecting hole 3120, thus facilitating welding between the second gathering part 422 and the hole wall of the connecting hole 3120.

[0102] In some embodiments, the first column 311 is made of aluminum and the second column 312 is made of copper.

[0103] Secondly, embodiments of this application also provide a battery pack, which includes any of the individual cells described above; the battery pack mentioned in this application generally includes a housing for encapsulating one or more individual cells or one or more battery modules. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the individual cells.

[0104] Thirdly, embodiments of this application also provide an electrical device that uses the single-cell battery disclosed herein as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Among these, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0105] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A single-cell battery, characterized in that, Having a first orientation (Z), the single cell includes: Shell (1); A top cover plate (21) is connected to the housing (1), and the top cover plate (21) has a through mounting hole (210); The pole post (3) is inserted through the mounting hole (210), and the pole post (3) has a connecting hole (3120) extending along the first direction (Z); An electrode assembly (4) is disposed within the housing (1). The electrode assembly (4) includes a battery cell body (41) and an electrode tab (42). The electrode tab (42) includes a first folding portion (421) and a second folding portion (422). The first folding portion (421) is connected between the battery cell body (41) and the second folding portion (422). The second folding portion (422) extends along the first direction (Z). An insulating protective component (5) is disposed inside the housing (1) and connected to the second gathering part (422). The insulating protective component (5) has a limiting channel (50). The second gathering part (422) passes through the limiting channel (50) and the connecting hole (3120). The end of the second gathering part (422) away from the first gathering part (421) is welded to the pole post (3) and seals the connecting hole (3120).

2. The single-cell battery according to claim 1, characterized in that, The single cell also has a second direction (Y), the first direction (Z) and the second direction (Y) are perpendicular to each other, the end of the second gathering part (422) away from the first gathering part (421) is a connecting end (4221), the connecting end (4221) and the hole wall of the connecting hole (3120) are welded to form a first solder mark (1000); along the second direction (Y), the size of the first solder mark (1000) is larger than the size of the second gathering part (422).

3. The single-cell battery according to claim 1, characterized in that, At least a portion of the insulating protective element (5) is inserted into the connection hole (3120), and the insulating protective element (5) is connected to the pole (3).

4. The single-cell battery according to claim 3, characterized in that, The single cell also has a second direction (Y), and the first direction (Z) and the second direction (Y) are perpendicular to each other; the insulating protective member (5) includes a first protective part (51) and a second protective part (52), the first protective part (51) is located on one side of the second gathering part (422) along the second direction (Y), the second protective part (52) is located on the other side of the second gathering part (422) along the second direction (Y), and the limiting channel (50) is defined between the first protective part (51) and the second protective part (52).

5. The single-cell battery according to claim 4, characterized in that, The first protective part (51) includes a first protective piece (511), and the second protective part (52) includes a third protective piece (521). The first protective piece (511) and the third protective piece (521) define the limiting channel (50). The first protective piece (511) and the third protective piece (521) are arranged opposite to each other along the second direction (Y). The first protective piece (511) and the third protective piece (521) are both connected to the second gathering part (422). The first protective piece (511) and the third protective piece (521) both extend along the first direction (Z). The end of the first protective piece (511) near the connecting hole (3120) is inserted into the connecting hole (3120), and the end of the third protective piece (521) near the connecting hole (3120) is inserted into the connecting hole (3120).

6. The single-cell battery according to claim 5, characterized in that, The first protection part (51) further includes a second protection piece (512) connected to the first protection piece (511), and the second protection part (52) further includes a fourth protection piece (522) connected to the third protection piece (521). The second protection piece (512) is inclined relative to the first direction (Z), and the fourth protection piece (522) is inclined relative to the first direction (Z). The first gathering part (421) has a first outer side (4211) and a second outer side (4212) facing the pole post (3). The first outer side (4211) and the second outer side (4212) are respectively provided on both sides of the second gathering part (422) along the second direction (Y), and the first outer side (4211) and the second outer side (4212) are both connected to the second gathering part (422) and the battery cell body (41). The second protective sheet (512) is attached to the first outer side (4211), and the fourth protective sheet (522) is attached to the second outer side (4212).

7. The single-cell battery according to claim 5, characterized in that, The connecting hole (3120) has a first hole segment (31201) and a second hole segment (31202) that are interconnected. The second hole segment (31202) is located on the side of the first hole segment (31201) near the battery cell body (41), and the cross-sectional area of ​​the second hole segment (31202) is larger than the cross-sectional area of ​​the first hole segment (31201). The second gathering part (422) passes through the second hole segment (31202) and the first hole segment (31201). The end of the first protective plate (511) near the second hole segment (31202) is inserted into the second hole segment (31202), and the end of the third protective plate (521) near the second hole segment (31202) is inserted into the second hole segment (31202).

8. The single-cell battery according to any one of claims 1-7, characterized in that, The single cell also includes a sealing element (22); The outer periphery of the pole post (3) has a first mating surface (301), which is inclined relative to the first direction (Z). The sealing element (22) is arranged around the pole post (3), and the wall of the assembly hole (210) has a second mating surface (2101). The second mating surface (2101) is inclined relative to the first direction (Z). The entire sealing element (22) is located inside the assembly hole (210), and the sealing element (22) is sealed and connected to the first mating surface (301) and the second mating surface (2101) respectively.

9. The single-cell battery according to claim 8, characterized in that, The inner circumferential side of the sealing element (22) has a third mating surface (221) that abuts against the first mating surface (301), and the outer circumferential side of the sealing element (22) has a fourth mating surface (222) that abuts against the second mating surface (2101); the pole post (3) has a first surface (302) disposed near the battery cell body (41); Wherein, the angle between the first mating surface (301) and the first surface (302) is a first acute angle, the angle between the second mating surface (2101) and the first surface (302) is a second acute angle, the angle between the third mating surface (221) and the first surface (302) is a third acute angle, and the angle between the fourth mating surface (222) and the first surface (302) is a fourth acute angle, and the first acute angle, the second acute angle, the third acute angle, and the fourth acute angle are equal.

10. The single-cell battery according to claim 8, characterized in that, The single cell also includes an inner insulating component (23) and an outer insulating component (24); The seal (22) has a first end face (223) and a second end face (224) disposed opposite to each other in the first direction (Z); The inner insulating member (23) includes a first insulating part (231) and a second insulating part (232). The first insulating part (231) is connected to one side of the top cover plate (21) and located inside the housing (1). The second insulating part (232) protrudes from the side of the first insulating part (231) away from the cell body (41), and at least a portion of the second insulating part (232) is located inside the mounting hole (210). The second insulating part (232) surrounds the pole post (3) and is connected to the first end face (223). The outer insulating member (24) includes a third insulating part (241) and a fourth insulating part (242). The third insulating part (241) is connected to the top cover plate (21) on the side away from the first insulating part (231) in the first direction (Z). The fourth insulating part (242) is connected to the side of the third insulating part (241) near the pole post (3). The fourth insulating part (242) is located in the mounting hole (210) and surrounds the pole post (3). The fourth insulating part (242) is connected to the second end face (224).

11. The single-cell battery according to claim 10, characterized in that, The top cover plate (21) has a receiving groove (2111) that communicates with the assembly hole (210) on the side near the battery cell body (41); The first insulating part (231) includes a first insulating segment (2311) and a second insulating segment (2312). The second insulating segment (2312) is accommodated in the accommodating groove (2111). The second insulating part (232) is connected to the end of the second insulating segment (2312) near the pole post (3). The first insulating segment (2311) is connected to the end of the second insulating segment (2312) away from the pole post (3).

12. The single-cell battery according to claim 11, characterized in that, The first insulating segment (2311) has a third end face (23111) disposed near the cell body (41), and along the first direction (Z), the pole (3) is located on the side of the third end face (23111) away from the cell body (41).

13. The single-cell battery according to claim 10, characterized in that, The top cover plate (21) includes a plate body (211) and a protrusion (212). The plate body (211) connects the housing (1) and the protrusion (212). The mounting hole (210) passes through the plate body (211) and the protrusion (212) along the first direction (Z). The protrusion (212) protrudes from the side of the plate body (211) away from the cell body (41). A connecting groove (243) is formed between the third insulating part (241) and the fourth insulating part (242), and at least a portion of the protrusion (212) is inserted into the connecting groove (243).

14. The single-cell battery according to claim 10, characterized in that, The third insulating part (241) has a receiving groove (2411) on the side away from the cell body (41) in the first direction (Z). The receiving groove (2411) has a first groove bottom surface (24111), which is located on the side of the top cover plate (21) away from the cell body (41). The first groove bottom surface (24111) has a through hole (24112). The pole post (3) includes a column part (31) and a flange part (32). The outer peripheral side of the column part (31) has the first mating surface (301). The column part (31) passes through the through hole (24112). The flange part (32) is connected to the column part (31). At least a portion of the flange part (32) is accommodated in the receiving groove (2411). The flange part (32) is connected to the bottom surface of the first groove (24111).

15. The single-cell battery according to claim 14, characterized in that, The column portion (31) includes a first column (311) and a second column (312). The flange portion (32) is connected to the first column (311) and located on the side of the first column (311) away from the battery cell body (41). The second column (312) is connected to the first column (311) and located on the side of the first column (311) close to the battery cell body (41). The connecting hole (3120) is provided on the second column (312). The first column (311) is provided with a through hole (3111) communicating with the connecting hole (3120). The cross-sectional area of ​​the through hole (3111) is larger than the cross-sectional area of ​​the connecting hole (3120); The individual cell also has a reference plane (2000), the first direction (Z) is perpendicular to the reference plane (2000), and the orthographic projection of the hole wall of the connecting hole (3120) along the first direction (Z) onto the reference plane (2000) is entirely within the contour range of the orthographic projection of the hole wall of the through hole (3111) along the first direction (Z) onto the reference plane (2000).

16. A battery pack, characterized in that, The battery pack comprises the individual battery cells as described in any one of claims 1-15.

17. An electrical appliance, characterized in that, The electrical device includes a single battery cell as described in any one of claims 1-15, or includes a battery pack as described in claim 16.

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