Battery cell, battery, and electrical apparatus

Abstract

A battery cell, a battery, and an electrical apparatus, belonging to the technical field of batteries. The battery cell comprises: a casing component, a pole component, and an electrode component. The casing component is provided with an accommodating cavity and comprises a shell which participates in enclosingly forming the accommodating cavity, the casing being an integrated member, one end of the casing being provided with an opening, and an end of the casing opposite to the opening being a first casing wall. The pole component is mounted on the first casing wall. The electrode component is accommodated in the accommodating cavity and is connected to the pole component.

Description

Battery cells, batteries and electrical devices Technical Field

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

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, the power battery, as the power source, plays an irreplaceable and crucial role. A power battery consists of several individual battery cells; however, the reliability of these individual cells needs improvement, which in turn necessitates enhancing the overall reliability of the power battery.

[0003] Summary of the Invention

[0004] This application provides a battery cell, a battery, and an electrical device that can improve the reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including: a housing component, a terminal component, and an electrode component. The housing component has a receiving cavity and includes a shell body that participates in forming the receiving cavity. The shell body is an integral piece and has an opening at one end. The end of the shell body opposite to the opening is a first shell wall. The terminal component is mounted on the first shell wall. The electrode component is housed in the receiving cavity and connected to the terminal component.

[0006] In the above technical solution, the electrode components housed in the casing need to be connected to the terminal post components mounted on the first casing wall. Therefore, when the battery vibrates or deforms, the terminal post components connected through the busbar component will be stretched. Since the terminal post components are located on the end wall opposite the opening of the casing, the force on the terminal post components will be preferentially transmitted to the casing as a single unit, rather than directly acting on the structure that cooperates with the casing, such as the casing cover. This not only extends the distance the force is transmitted to the connection between the casing and the casing cover, but also causes the casing to deform preferentially under stress, reducing the stress at the connection between the casing and the casing cover. This effectively reduces the probability of cracking at the connection between the casing and the casing cover during battery use, improving the reliability of the battery cell. Furthermore, since the casing is a single unit, it is less prone to stress concentration and cracking during stretching and vibration. Therefore, it is not necessary to increase the wall thickness to increase the connection reliability of each wall, which helps to reduce weight and material costs, and also facilitates the miniaturization of the battery cell or the increase of the energy density of the battery cell.

[0007] In some embodiments, the electrode component includes an electrode body, a transition structure, and an insulating structure. The transition structure surrounds the electrode body and is connected to a first shell wall. The insulating structure is insulated between the transition structure and the electrode body. The electrode component is connected to the electrode body.

[0008] In the above technical solution, the pole component has a simple structure and is easy to process. Since it includes two parts, the pole body and the adapter structure, the shape and size of the pole body and the adapter structure can be designed separately based on different design points. For example, a racetrack-shaped adapter structure can be used with a circular pole body, or a racetrack-shaped adapter structure can be used with a racetrack-shaped pole body, so as to flexibly adapt to the connection requirements of different types of housing components and electrode components, and increase the applicability of the pole component.

[0009] In some embodiments, the transition structure is formed as an elongated strip extending along the length direction of the first shell wall, and the outline shape of the pole body matches the outline shape of the transition structure; or, the transition structure is formed as an elongated strip extending along the length direction of the first shell wall, and the pole body is located at the length center of the transition structure and is circular.

[0010] In the above technical solution, when the outline shape of the electrode body is formed into an elongated shape that matches the outline shape of the adapter structure, the area of ​​the electrode body is larger, which is beneficial to increasing the connection area between the conductive part and the electrode body, thereby improving charging performance. When the electrode body is located at the center of the length of the elongated adapter structure and is circular, the connection force between the electrode body and the adapter structure can be evenly distributed on the circumference, which can improve the uniformity of the force at the connection between the electrode body and the adapter structure, thereby improving the connection reliability between the electrode body and the adapter structure.

[0011] In some embodiments, an insulating structure is sealed between the adapter structure and the pole body.

[0012] In the above technical solution, the casing component requires a sealing performance to prevent electrolyte leakage to the outside. Therefore, the insulating structure not only insulates the adapter structure from the electrode body but also ensures a sealed connection between the adapter structure and the electrode body, thus achieving the sealing function of the casing component. By sealing the adapter structure between the adapter structure and the electrode body, during battery cell sealing, only the adapter structure needs to be connected to the first casing wall, eliminating the need to apply significant pressure to the first casing wall. This reduces the stress on the first casing wall, protecting the casing component and allowing for a reduction in casing wall thickness and material costs. Furthermore, since the first casing wall is the end opposite the opening, the stress at the connection between the first and second casing walls, as well as the stress on the second casing wall itself, is reduced, thus ensuring casing reliability and reducing casing wall thickness and cost.

[0013] In some embodiments, the insulating structure includes a sealing structure member that is circumferentially disposed on the side of the adapter structure facing the pole body and is at least partially sandwiched between the adapter structure and the pole body in the inward and outward directions of the first housing wall.

[0014] In the above technical solutions, by setting at least a portion of the sealing structure between the transition structure and the pole body in the inner and outer directions of the first shell wall, an axial seal is achieved between the transition structure and the pole body. This axial seal provides a relatively reliable sealing effect and improves the leakage problem at the mating position of the transition structure and the pole body. Furthermore, the embodiments of this application, by integrating the axial seal into the pole component, can reduce the axial force on the first shell wall. Moreover, by placing the sealing structure around the inner ring of the transition structure, the sealing structure can be close to the mating position of the transition structure and the pole body, facilitating a shorter path for sealing the mating position, improving sealing reliability, and reducing the size of the sealing structure and sealing area. This makes it easier to achieve compression sealing, reducing the likelihood of seal failure and improving the sealing effect.

[0015] In some embodiments, the electrode body includes a peripheral portion, the adapter structure is clamped on both sides of the peripheral portion in the inward and outward directions of the first shell wall by an insulating structure, and at least a portion of the sealing structure is clamped between the side of the peripheral portion facing the electrode component and the adapter structure.

[0016] In the above technical solution, the electrode post component has a simple structure and is easy to manufacture, enabling simple and effective fixation and insulating fit between the electrode post body and the adapter structure. The sealing structure is clamped between the peripheral portion of the electrode post body and the adapter structure, allowing the sealing structure to be positioned at the mating point between the adapter structure and the electrode post body. This facilitates sealing at the mating point via a shorter path, improving sealing reliability. Furthermore, it reduces the size of the sealing structure, decreases the sealing area, and facilitates compression sealing, reducing the likelihood of seal failure and enhancing the sealing effect. Moreover, since at least a portion of the sealing structure is clamped between the peripheral portion facing the electrode component and the adapter structure, the sealing structure can seal from the peripheral portion facing the receiving cavity, more effectively suppressing electrolyte leakage from the mating point between the electrode post body and the adapter structure, thereby improving the sealing effect.

[0017] In some embodiments, the adapter structure includes a mating ring portion, the pole body includes a through portion passing through the mating ring portion, and an inner limiting portion and an outer limiting portion connected to the through portion and clamped on the inner and outer sides of the mating ring portion, and at least a portion of the sealing structure is clamped between the mating ring portion and the inner limiting portion.

[0018] In the above technical solution, the electrode post component has a simple structure and is easy to manufacture, enabling simple and effective fixation and insulating fit between the electrode post body and the adapter structure. The sealing structure is clamped at the mating position between the electrode post body and the mating ring, allowing the sealing structure to be positioned at the mating position between the adapter structure and the electrode post body. This facilitates sealing at the mating position of the adapter structure and the electrode post body via a shorter path, improving sealing reliability. Furthermore, it allows for a smaller size and sealing area of ​​the sealing structure, facilitating compression sealing, reducing the likelihood of seal failure, and enhancing the sealing effect. Moreover, since at least a portion of the sealing structure is clamped between the mating ring and the inner limiting portion, the sealing structure can seal from the side of the mating ring facing the receiving cavity, more effectively suppressing electrolyte leakage from the mating position between the electrode post body and the adapter structure, thereby improving the sealing effect.

[0019] In some embodiments, the first housing wall has a mounting hole, and a sealing ring is provided around the mounting hole, the sealing ring being clamped between the pole member and the first housing wall.

[0020] In the above technical solution, the pole post component has a simple structure, is easy to process, and is easy to assemble and connect with the first shell wall.

[0021] In some embodiments, the first housing wall has a mounting hole, the pole member covers the mounting hole, and the edge of the transition structure overlaps one side of the first housing wall in the wall thickness direction.

[0022] In the above technical solution, the assembly of the adapter structure and the first shell wall is facilitated, improving production efficiency. When the edge of the adapter structure overlaps the side of the first shell wall away from the electrode component, it facilitates the assembly and connection of the electrode post component and the first shell wall, which helps to improve the connection reliability between the electrode post component and the first shell wall. When the edge of the adapter structure overlaps the side of the first shell wall facing the electrode component, the electrode component and the electrode post component can be installed into the shell together, and the electrode post component does not need to pass through the mounting hole, thereby reducing operation steps and lowering the operation difficulty.

[0023] In some embodiments, the edge of the adapter structure overlaps the side of the first housing wall away from the electrode component, the first housing wall has a first recessed groove surrounding the mounting hole, the first recessed groove is open in the direction away from the electrode component, and the edge of the adapter structure has a flange portion embedded in the first recessed groove.

[0024] In the above technical solution, it is convenient to support and position the connection between the transition structure and the first shell wall, and it is beneficial for the two to be welded together from the outside of the first shell wall.

[0025] In some embodiments, the edge of the adapter structure overlaps the side of the first housing wall away from the electrode component, the mounting hole is an elongated hole, and the pole component is formed into an elongated structure that matches the shape of the mounting hole.

[0026] In the above technical solution, the space required for the flipping movement of the electrode post component is small, which can reduce the space required for the flipping of the electrode post component, thereby helping to shorten the length of the conductive part, save materials, reduce costs, and reduce the redundancy of the conductive part, reduce the space occupied by the conductive part in the cavity, which is conducive to improving the energy density of the battery cell.

[0027] In some embodiments, the edge of the adapter structure overlaps with the side of the first shell wall facing the electrode component, and the edge of the adapter structure has a second recessed groove that opens in a direction away from the electrode component. The first shell wall includes an overlapping portion protruding into the mounting hole, and the overlapping portion is embedded in the second recessed groove.

[0028] In the above technical solution, it is convenient to support and position the connection between the pole post component and the first shell wall, and it is beneficial for the two to be welded together from the outside of the first shell wall.

[0029] In some embodiments, the transition structure is welded to the first shell wall.

[0030] In the above technical solution, welding is used to connect the transition structure and the first shell wall, which facilitates processing and can better ensure the reliability of the connection between the transition structure and the first shell wall.

[0031] In some embodiments, the weld formed by welding the transition structure to the first shell wall is exposed on the side of the first shell wall away from the electrode component.

[0032] In the above technical solution, welding can be performed from the outside of the first shell wall, which facilitates the welding operation and increases the welding space.

[0033] In some embodiments, the electrode post component forms a receiving groove that is recessed relative to the first shell wall in a direction away from the electrode component and open in a direction towards the electrode component. The electrode component is connected to the electrode post component through a conductive portion, at least a portion of which is received in the receiving groove and connected to the electrode post body.

[0034] In the above technical solution, by setting a receiving groove to accommodate the conductive part, the space occupied by the conductive part in the receiving cavity can be reduced, allowing the receiving cavity to have a larger space to accommodate the active material coating part. This is beneficial to increasing the volume of the active material coating part, thereby increasing the energy density of the battery cell. Moreover, since the receiving groove is open towards the electrode components, the conductive part can be easily inserted into the receiving groove, reducing the difficulty of operation.

[0035] In some embodiments, a receiving groove is formed on the side of the electrode component facing the electrode component of the electrode post body and the adapter structure, and the adapter structure protrudes relative to the first shell wall in the direction away from the electrode component, so that the receiving groove is recessed relative to the first shell wall in the direction away from the electrode component.

[0036] In the above technical solution, by processing the adapter structure into an outwardly protruding bulge, a portion of the receiving groove is formed on the side of the pole body facing the electrode component, and another portion of the receiving groove is formed on the side of the adapter structure facing the electrode component. The receiving groove has a shape that is concave relative to the first shell wall in the direction away from the electrode component. Thus, both the side of the pole body facing the electrode component and the side of the adapter structure facing the electrode component have a space receiving groove conductive part. This not only facilitates the storage of conductive parts to a greater extent, but also facilitates the design of diverse forms of conductive parts.

[0037] In some embodiments, the surface of the electrode body facing the electrode component is the inner end face of the electrode body, the inner end face of the electrode body participates in forming a receiving groove, and the conductive part is connected to the inner end face of the electrode body.

[0038] In the above technical solution, at least a portion of the receiving groove is surrounded by the side surface of the electrode body facing the electrode component. The conductive part housed in the receiving groove can easily contact and connect to the electrode body, improving connection convenience and simplifying the structure.

[0039] In some embodiments, the position of the inner end face of the adapter structure adjacent to the electrode body is a surrounding region that surrounds the electrode body, the surrounding region being flush with the inner end face of the electrode body; or, the inner end face of the electrode body protrudes from the surrounding region in the direction toward the electrode component; or, the surrounding region protrudes from the inner end face of the electrode body in the direction toward the electrode component.

[0040] In the above technical solution, the relative position of the surrounding area and the inner end face of the pole body is not limited, which can realize a variety of flexible designs.

[0041] In some embodiments, the electrode component includes an electrode body, the electrode body includes a first electrode member and a second electrode member, the second electrode member is mounted on a first housing wall and defines a mating hole, the first electrode member is mounted on the side of the second electrode member away from the electrode component and covers the mating hole, and the electrode component is connected to the first electrode member through a conductive portion extending into the mating hole.

[0042] In the above technical solution, when assembling a battery cell, the first electrode post can be connected to the conductive part first, and the second electrode post can be connected to the first shell wall first. Then the first electrode post and the second electrode post can be connected. This also enables the installation of the electrode post components and electrode components onto the shell body, which helps to shorten the tabs.

[0043] In some embodiments, the first housing wall has a mounting hole, the second pole piece passes through the mounting hole and is clamped on the inner and outer sides of the first housing wall, and an insulating sealing component is provided between the second pole piece and the first housing wall.

[0044] In the above technical solution, the connection between the second pole piece and the first shell wall is relatively reliable, and by setting an insulating sealing component, the second pole piece can be made of metal material, which is beneficial to increasing the conductive area of ​​the pole piece body.

[0045] In some embodiments, the electrode component includes an electrode body, the surface of the electrode body facing the electrode component is the inner end face of the electrode body, the electrode component is connected to the inner end face of the electrode body through a conductive part, and the conductive part is partially laid on the inner end face of the electrode body.

[0046] In the above technical solution, by laying at least a portion of the conductive part on the inner end face of the electrode body, the at least portion of the conductive part is laid flat, and the projection of the at least portion of the conductive part falls on the inner end face of the electrode body, which is beneficial to improving the connection reliability between the conductive part and the electrode body, and also beneficial to increasing the connection area between the conductive part and the electrode body, thereby improving the conductivity.

[0047] In some embodiments, the inner end face of the electrode post body is inclined relative to the axial section of the electrode component, and the axial section of the electrode component is perpendicular to the electrode tab direction of the electrode component.

[0048] In the above technical solution, before laying at least a portion of the conductive part on the inner end face of the electrode body, the electrode component can be adjusted so that the inner end face of the electrode body is parallel to the electrode tab direction of the electrode component. This facilitates laying at least a portion of the conductive part on the inner end face of the electrode body, providing a larger welding operation space. Moreover, at this time, the direction of the line connecting the two ends of the electrode body is inclined to the direction of the electrode tab of the electrode component. Thus, after the conductive part is connected to the electrode body, the electrode component can be rotated less than 90°, which satisfies the requirement that the direction of the line connecting the two ends of the electrode body is parallel to the first shell wall. This allows the inner end face of the electrode body to be parallel to the axial section of the electrode component, reducing the rotation angle of the electrode component and shortening the length of the conductive part.

[0049] In some embodiments, the electrode component includes an electrode body, and the electrode component includes an active material coating portion housed in a receiving cavity, and an electrode tab portion connected to the active material coating portion, the electrode tab portion extending to the electrode body and connected to the electrode body.

[0050] In the above technical solution, the use of conductive components can be omitted, as can the connection process between the conductive components and the electrode tabs.

[0051] In some embodiments, the surface of the electrode body facing the electrode component is the inner end face of the electrode body, and the tab includes a gathering portion formed by stacking and connecting multiple layers of tab sheets. At least a portion of the gathering portion is laid on the inner end face of the electrode body and connected to the inner end face of the electrode body.

[0052] In the above technical solution, by laying at least a portion of the gathering part on the inner end face of the pole body and connecting it to the inner end face of the pole body, it is beneficial to increase the connection area between the pole ear and the pole body, the connection reliability and the current carrying capacity.

[0053] In some embodiments, the electrode component includes an electrode body, and the electrode component includes an active material coating portion housed in a receiving cavity, and an electrode tab portion connected to the active material coating portion, the electrode tab portion being connected to the electrode body via a conductive element.

[0054] In the above technical solution, the electrode tab and the electrode post body are indirectly connected by a conductive component, which can shorten the length of the electrode tab, improve the problems of wrinkling, bending and breaking of the electrode tab, and reduce the difficulty of connecting the conductive component and the electrode post body by flexibly designing the shape and material of the conductive component, thereby improving the convenience of connecting the conductive component and the electrode post body.

[0055] In some embodiments, the conductive element includes a first connecting segment, the first connecting segment includes two clamping portions, and the electrode portion includes an electrode end, the electrode end being clamped between the two clamping portions and connected to the clamping portions.

[0056] In the above technical solution, two clamping parts can be used to limit the position of the tab end, improving the connection reliability of the multi-layer tab pieces in the tab end. In addition, in some examples, by setting two clamping parts, the tab end clamped between the two clamping parts can be in a stacked state, which can eliminate the step of connecting the multi-layer tab pieces in the stacked part to form a closing part, thereby simplifying the processing steps and improving processing efficiency.

[0057] In some embodiments, the surface of the electrode body facing the electrode component is the inner end face of the electrode body. The conductive element includes a second connecting segment, which is laid on the inner end face of the electrode body and connected to the inner end face of the electrode body. The conductive element is bent at the connection position between the first connecting segment and the second connecting segment so that the first connecting segment is located on the side of the second connecting segment away from the electrode body. One of the clamping portions supports the side of the electrode tab end away from the electrode body.

[0058] In the above technical solution, the support of the tabs by the clamping part can improve the redundancy of the tabs and reduce the risk of short circuits caused by the tabs being inserted into the active material coating part. Moreover, the bent conductive parts can act as a buffer support, reducing the risk of the electrode components hitting the first shell wall and improving the reliability of the battery cell.

[0059] In some embodiments, the tab portion includes a folded portion formed by stacking and connecting multiple tab sheets, and the conductive element includes a first connecting segment, the folded portion being stacked on one side of the first connecting segment in the thickness direction and connected to the first connecting segment.

[0060] In the above technical solution, the first connecting section is in the form of a plate. The thickness direction of the first connecting section is consistent with that of the gathering part. The two are stacked along the thickness direction of the first connecting section, so the way the gathering part and the conductive part are matched is simple, which is conducive to improving production efficiency.

[0061] In some embodiments, the surface of the electrode body facing the electrode component is the inner end face of the electrode body, and the first connecting segment is supported on the side of the folding portion away from the electrode body, so that the folding portion is clamped between the inner end face of the electrode body and the first connecting segment.

[0062] In the above technical solution, the support of the gathering part by the first connecting section can improve the redundancy of the electrode tab and reduce the risk of short circuit caused by the electrode tab being inserted into the active material coating part.

[0063] In some embodiments, the electrode component includes an electrode body, and the electrode component includes an active material coating portion housed in a receiving cavity. The active material coating portion is connected to the electrode body via a conductive portion, and the conductive portion is bent to form at least two opening slots, wherein the openings of the two opening slots face different directions and are adjacent in the direction from the electrode body to the active material coating portion.

[0064] In the above technical solution, the conductive part can exhibit a serpentine, reciprocating bending shape. This conductive part acts as a buffer, reducing the impact of the active material coating on the first shell wall when the battery cell is used in a vibration environment, thus protecting the electrode components and improving the reliability of the battery cell. Furthermore, because the conductive part does not extend irregularly, it reduces interference and friction between the tabs within the conductive part, as well as the risk of the tabs being inserted backwards into the active material coating, further enhancing the reliability of the battery cell.

[0065] In some embodiments, the electrode component includes a tab connected to the active material coating portion, the tab forming a conductive portion extending to and connected to the electrode post body, the tab bending independently to form two adjacent opening slots with opposite opening orientations; or, the electrode component includes a tab connected to the active material coating portion, the conductive portion including the tab and a conductive element connected to the tab, the tab being connected to the electrode post body via the conductive element, the conductive element and the tab bending together to form two adjacent opening slots with opposite opening orientations.

[0066] In the above technical solution, the conductive part can take the form of a reciprocating S-shape, which can shorten the length of the conductive part, simplify the structure of the conductive part, and facilitate the processing of the conductive part.

[0067] In some embodiments, the housing component further includes a mating shell, the housing body being semi-enclosed cylindrical, and the mating shell covering the opening; wherein the mating shell is flat or semi-enclosed cylindrical.

[0068] In the above technical solutions, the shell components have various shapes and can adapt to a variety of application scenarios.

[0069] In some embodiments, the battery cell further includes a pressure relief device located on the housing component and on the same side or opposite side as the terminal component.

[0070] In the above technical solutions, when the pressure relief device and the terminal post are located on the same side, the design of other shell walls besides the first shell wall can be simplified, thus simplifying the structure and processing of the battery cell. When the pressure relief device and the terminal post are located on opposite sides, there is no need to consider the space occupied by the pressure relief device in the first shell wall, thereby reducing the volume of the terminal post. This allows for flexible design of the shape and volume of the terminal post as needed.

[0071] Secondly, embodiments of this application also provide a battery, including a battery cell of any of the above-described solutions.

[0072] 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.

[0073] In some embodiments, the battery includes a housing, multiple battery cells are housed in the housing, the bottom of the housing is a housing bottom plate, and the terminal post is located on the side of the housing component facing the housing bottom plate, or on the side of the housing component away from the housing bottom plate.

[0074] In the above technical solution, when the terminal post of the battery cell is located on the side of the housing component facing the bottom plate of the box, the battery cell 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 post of the battery cell is located on the side of the housing component close to the bottom plate of the box, the battery cell is in an upright state, and the electrolyte is not easy to leak; therefore, the flexible setting of the battery cell and the box orientation can be realized.

[0075] Thirdly, embodiments of this application also provide an electrical device including a battery from any of the above-described solutions.

[0076] In the above technical solution, the improved battery performance is beneficial to enhancing the power consumption performance of the electrical device. Attached Figure Description

[0077] 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.

[0078] Figure 1 is a structural schematic diagram of a vehicle provided in some embodiments of this application;

[0079] Figure 2 is an exploded view of a battery provided in some embodiments of this application;

[0080] Figure 3 is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0081] Figure 4 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0082] Figure 5 is a magnified view of a portion of Figure 4;

[0083] Figure 6 is a top view of a battery cell provided in some embodiments of this application;

[0084] Figure 7 is a cross-sectional view along line AA in Figure 6;

[0085] Figure 8 is a schematic diagram of the pole post component provided in some embodiments of this application;

[0086] Figure 9 is a top view of the pole post component shown in Figure 8;

[0087] Figure 10 is a view along direction B shown in Figure 9;

[0088] Figure 11 is a cross-sectional view along line CC in Figure 9;

[0089] Figure 12 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0090] Figure 13 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0091] Figure 14 is a partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0092] Figure 15 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0093] Figure 16 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0094] Figure 17 is a cross-sectional view of a battery cell provided in some embodiments of this application;

[0095] Figure 18 is a partial cross-sectional view of a battery cell provided in some embodiments of this application, in which the terminal component is in a state before being covered by the first shell wall;

[0096] Figure 19 is a diagram showing the pole post component shown in Figure 18 after it is covered by the first shell wall;

[0097] Figure 20 is an exploded view of a portion of the battery cell provided in some embodiments of this application;

[0098] Figure 21 is a partial cross-sectional view of a battery cell provided in some embodiments of this application, in which the terminal component is in a state before being covered by the first shell wall;

[0099] Figure 22 is a diagram showing the pole post component shown in Figure 21 after it is covered by the first shell wall;

[0100] Figures 23A-23D are exploded views of the processing of a battery cell according to an embodiment of this application;

[0101] Figures 24A and 24B are exploded views of the processing of a battery cell according to an embodiment of this application;

[0102] Figures 25A-25C are exploded views of the manufacturing process of an electrode component provided in one embodiment of this application;

[0103] Figures 26A-26D are exploded views of the processing of a battery cell according to an embodiment of this application;

[0104] Figures 27A-27C are exploded views of the processing of a battery cell according to an embodiment of this application;

[0105] Figures 28A-28D are exploded views of the processing of a battery cell according to an embodiment of this application;

[0106] Figures 29A-29D are exploded views of the processing of a battery cell according to an embodiment of this application;

[0107] Figures 30A-30D are exploded views of the processing of a battery cell according to an embodiment of this application;

[0108] Figures 31A-31E are exploded views of the processing of a battery cell according to an embodiment of this application.

[0109] Reference numerals: Vehicle 1000; Battery 100; Controller 200; Motor 300; Housing 101; First housing section 1011; Second housing section 1012; Battery cell 102; First direction F1; Second direction F2; Third direction F3; Fifth direction F5; Housing component 1; Housing body 11; First housing wall 111; First recess 1111; Overlapping part 1112; Mounting hole 112; Opening 113; Second housing wall 114; Housing cover 12; Receiving cavity 13; Sealing ring 14; Terminal component 2; Terminal body 21; Inner end face 211; Outer end face 213; Through part 214; Riveting part 2141; Inner limiting part 215; Outer limiting part 216; First terminal component 21a; Second terminal component 21b; Mating hole 21b1; Adapter structure 22; Inner end face 220 of the transition structure; surrounding area 2201; flange portion 22a; second recessed groove 22b; first transition ring 221; second transition ring 222; stop ring portion 2221; first insulating frame 224; third transition ring 223; inner extension portion 2231; outer extension portion 2232; second insulating frame 225; fourth transition ring 227; mating ring portion 2271; third insulating frame 228; insulating structure 23; sealing structure component 231; axial side portion 231a; first insulating component 232; second insulating component 234; insulating sealing component 24; electrode component 3; electrode assembly 31; tab 311; stacked portion 312; gathered portion 313; active material coating portion 32; tab portion 33; tab end 331; axial section of electrode component 34; conductive portion 4; conductive component 41; opening groove 42; First connecting section 411; clamping part 4110; second connecting section 412; first conductive section 415; second conductive section 416; third conductive section 417; receiving groove 5; pressure relief device 6. Detailed Implementation

[0110] 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.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] In this application, "multiple" means two or more, including two.

[0117] 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.

[0118] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. Exemplarily, a battery 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.

[0119] 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.

[0120] 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.

[0121] 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 a negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. The material of the separator can be PP, polypropylene, PE, polyethylene, etc. The electrode assembly mentioned in the embodiments of this application has a wound or stacked structure.

[0122] In related technologies, the battery cell casing includes a body and a cover. Electrode assemblies are installed inside the body through an opening in the body. The cover is positioned over the opening and welded to the body. Terminals are located on the body. Multiple battery cells are connected via a busbar, which is located outside the casing and connected to the terminals. When the battery vibrates or deforms, the terminals connected by the busbar will pull against each other. Because the terminals are mounted on the cover, the force on the terminals will be preferentially transmitted to the weld between the cover and the body, causing cracks at the connection.

[0123] In view of this, the embodiments of this application place the terminal component on the end wall opposite to the opening of the casing. When the battery vibrates or deforms, the terminal component connected through the busbar will be stretched. Since the terminal component is placed on the end wall opposite to the opening of the casing, the force on the terminal component will be preferentially transmitted to the casing as a single piece, rather than directly acting on the structure that cooperates with the casing, such as the casing cover. This not only extends the distance the force is transmitted to the connection between the casing and the casing cover, but also causes the casing to deform preferentially under stress, reducing the stress at the connection between the casing and the casing cover. This effectively reduces the probability of cracking at the connection between the casing and the casing cover during battery use, improving the reliability of the battery cell. Furthermore, since the casing is a single piece, it is less prone to stress concentration and cracking during stretching and vibration. Therefore, it is not necessary to increase the wall thickness to increase the connection reliability of each wall, which helps to reduce weight and material costs, and also facilitates the miniaturization of the battery cell or the increase of the energy density of the battery cell.

[0124] The technical solutions described in the embodiments of this application are applicable to battery cells, batteries containing battery cells, and electrical devices using batteries.

[0125] 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.

[0126] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0127] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 is equipped with a battery 100, which can be located at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000.

[0128] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0129] In some embodiments of this application, the battery 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.

[0130] Please refer to Figure 2, which is an exploded view of a battery 100 provided in some embodiments of this application. The battery 100 includes a battery cell 102 and a housing 101 for housing the battery cell 102. The housing 101 can have various structural forms.

[0131] 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 element 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. For example, referring to FIG2, the first housing portion 1011 and the second housing portion 1012 may both be hollow structures with an opening on one side, with the opening side of the first housing portion 1011 covering the opening side of the second housing portion 1012, thus forming a housing 101 with a receiving space. As another example, the second housing portion 1012 may be a hollow structure with an opening on one side, and the first housing portion 1011 may be a cover that covers the opening side of the second housing portion 1012. Box 101 can be in various shapes, such as cylindrical box, cuboid box, etc.

[0132] In battery 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 whole assembly of multiple battery cells 102 is housed in 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 a whole assembly, which is then housed in 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 multiple battery cells 102.

[0133] Please refer to Figure 3, which 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. 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.

[0134] Please refer to Figures 4-7. Figure 4 is a cross-sectional view of the battery cell 102 provided in some embodiments of this application. Figure 5 is a partial enlarged view of Figure 4. Figure 6 is a top view of the battery cell 102 provided in some embodiments of this application. Figure 7 is a cross-sectional view along line AA in Figure 6.

[0135] Referring to Figure 4, the battery cell 102 may include a housing component 1, a terminal component 2, and an electrode component 3.

[0136] Referring to Figures 4 and 5, the terminal post 2 is mounted on the housing component 1. Exemplarily, the housing component 1 has a receiving cavity 13. The housing component 1 includes a first housing wall 111, which forms the receiving cavity 13. The first housing wall 111 has a mounting hole 112, and the terminal post 2 is mounted on the first housing wall 111 and located at the mounting hole 112. Here, "the terminal post 2 is mounted on the first housing wall 111" means that the terminal post 2 and the first housing wall 111 have an assembly connection relationship, such as welding or riveting. Therefore, the housing component 1 and the terminal post 2 are separate components, assembled together. This allows for the separate processing of the housing component 1 and the terminal post 2, facilitating their processing and the manufacturing of the battery cell 102.

[0137] Referring to Figures 4 and 5, the electrode component 3 is housed within the housing component 1. Exemplarily, the electrode component 3 includes an active material coating portion 32 and a tab portion 33. The active material coating portion 32 is housed within the receiving cavity 13, and the tab portion 33 is connected to the active material coating portion 32. The electrode component 3 includes one or more electrode assemblies 31. The portion of the electrode assembly 31 coated with an active material layer forms the active material coating portion 32, and the portion without an active material layer forms the tab portion 33. The tab portion 33 includes multiple layers of tab sheets 311.

[0138] Referring to Figures 5 and 7, electrode component 3 is connected to terminal component 2. Electrode component 3 is connected to terminal component 2 via conductive portion 4. Terminal component 2 includes terminal body 21, and active material coating portion 32 is connected to terminal body 21 via conductive portion 4, forming electrical conductivity. Exemplarily, battery 100 includes a current-collecting component located outside battery cell 102, and terminal body 21 is connected to the current-collecting component to form electrical conductivity, thereby allowing multiple battery cells 102 to be connected via the current-collecting component.

[0139] For example, when the electrode post 2 is the negative electrode, the electrode post body 21 can be a copper-aluminum composite component, wherein the copper-aluminum composite component can include an aluminum part and a copper part. The aluminum part is located on the side of the copper part away from the active material coating part 32, and can easily form a reliable connection with the aluminum busbar component. The copper part can easily connect with the copper foil material tab of the negative electrode. When the electrode post 2 is the positive electrode, the electrode post body 21 can be an aluminum component. The aluminum component can easily form a reliable connection with the aluminum busbar component, and the aluminum component can also easily connect with the aluminum foil material tab of the positive electrode.

[0140] The connection method between the conductive part 4 and the electrode component 2 is not limited, and may include, but is not limited to, ultrasonic welding, ultrasonic pre-welding combined with laser welding, resistance welding, pressure welding, brazing, bonding, etc.

[0141] For example, referring to Figure 5, the conductive part 4 may include both a tab 33 and a conductive element 41 connected to the tab 33. The tab 33 is indirectly connected to the electrode post body 21 through the conductive element 41. The conductive element 41 may be part of the electrode component 3, or it may be part of the electrode post component 2, or it may be independent of both the electrode component 3 and the electrode post component 2.

[0142] Therefore, by indirectly connecting the tab 33 and the pole body 21 through the conductive element 41, the length of the tab 33 can be shortened, and problems such as wrinkling, bending and breakage of the tab 311 can be improved. Furthermore, by flexibly designing the shape and material of the conductive element 41, the connection difficulty with the pole body 21 can be reduced, and the connection convenience between the conductive element 41 and the pole body 21 can be improved.

[0143] For example, referring to Figure 7, the conductive part 4 includes a tab 33, and is connected to the electrode body 21 through the tab 33. That is, the conductive element 41 is not required, and the tab 33 can be directly connected to the electrode body 21. Thus, the use of the conductive element 41 can be eliminated, and the connection process between the conductive element 41 and the tab 33 can be eliminated.

[0144] An insulating material is provided between the pole body 21 and the first housing wall 111 to achieve insulation between the first housing wall 111 and the pole body 21, thereby preventing the first housing wall 111 from becoming charged. For example, the insulating material can be part of the pole component 2 (e.g., insulation structure 23), or the insulating material can be provided between the pole component 2 and the housing component 1.

[0145] In some embodiments of this application, the housing component 1 includes a housing body 11 that participates in forming a receiving cavity 13, one end of the housing body 11 having an opening 113, and the end of the housing body 11 opposite to the opening 113 being a first housing wall 111.

[0146] The shell 11 is a single piece, that is, the shell 11 is a single molded part, and includes a first shell wall 111 and a second shell wall 114. The second shell wall 114 surrounds the edge of the first shell wall 111 and extends from the edge of the first shell wall 111 toward one side in the thickness direction of the first shell wall 111. The end of the second shell wall 114 opposite to the first shell wall 111 defines an opening 113. A cavity is defined between the first shell wall 111 and the second shell wall 114. The cavity constitutes at least part of the receiving cavity 13.

[0147] When the housing component 1 includes a shell body 11 with an opening 113 at one end, the housing component 1 also includes a mating shell. The mating shell mates with the shell body 11 to cover the opening 113 and together with the shell body 11, forms a receiving cavity 13. For example, the shell body 11 is semi-closed cylindrical, and the mating shell is flat, i.e., the mating shell can be a cover 12. In this case, the housing component 1 can be a combination of the shell body 11 and the cover 12. Or, for example, the shell body 11 is semi-closed cylindrical, and the mating shell is also semi-closed cylindrical. In this case, the housing component 1 can be a combination of two semi-closed cylindrical openings. Thus, the housing component has various shapes and can adapt to various application scenarios.

[0148] In the above technical solution, since the electrode components housed in the housing component 1 need to be connected to the terminal component 2 installed on the first housing wall 111, when the battery 100 vibrates or deforms, the terminal component 2 connected through the busbar component will be pulled. Since the terminal component 2 is located on the end wall opposite to the opening 113 of the housing body 11, the force on the terminal component 2 will be preferentially transmitted to the housing body 11, which is an integral part, and will not directly act on the mating shell that cooperates with the housing body, such as the cover 12. This not only extends the distance that the force is transmitted to the connection between the housing body 11 and the cover 12, but also causes the housing body 11 to deform preferentially when subjected to force, thereby reducing the force at the connection between the housing body 11 and the cover 12. This can effectively reduce the probability of cracking at the connection between the housing body 11 and the cover 12 during the use of the battery 100 and improve the reliability of the battery cell 102. Furthermore, the shell 11 is a single piece, which is not prone to stress concentration and cracking during pulling and vibration. Therefore, it is not necessary to increase the wall thickness to increase the connection reliability of each wall, which helps to reduce weight and material cost. It also helps to achieve miniaturization of the battery cell 102 or increase the energy density of the battery cell 102.

[0149] For example, when the end wall of the housing 11 opposite to the opening 113 serves as the first housing wall 111 for mounting the terminal post component 2, if the terminal post component 2 is first installed in the mounting hole 112 of the first housing wall 111 and then the electrode component 3 is installed into the housing 11, it is difficult to connect the electrode component 3 and the terminal post component 2. In some embodiments of this application, the electrode component 3 and the terminal post component 2 can be connected first, and then the terminal post component 2 can be assembled and connected to the housing component 1. This satisfies the connection requirements between the electrode component 3 and the terminal post component 2, as well as the connection requirements between the terminal post component 2 and the housing component 1, thereby improving the reliability and manufacturability of the battery cell 102.

[0150] Moreover, this processing sequence allows the length of the conductive part 4 to be effectively shortened. For example, as long as the electrode component 3 and the terminal component 2 are connected first, and the terminal component 2 is connected to the housing component 1 later, the material and cost of the conductive part 4 can be saved, the redundancy of the conductive part 4 can be reduced, the risk of short circuit can be reduced, and the space occupied by the conductive part 4 in the housing component 1 can be reduced, which is beneficial to improving the energy density of the battery cell 102.

[0151] The material of the housing component 1 is not limited, including but not limited to aluminum shell, steel shell, aluminum-plastic film, plastic or other materials resistant to electrolyte corrosion.

[0152] Please refer to Figures 8-11. Figure 8 is a schematic diagram of the electrode post component provided in some embodiments of this application; Figure 9 is a top view of the electrode post component shown in Figure 8; Figure 10 is a view along direction B shown in Figure 9; Figure 11 is a cross-sectional view along line CC in Figure 9. In some embodiments of this application, the electrode post component 2 includes an electrode post body 21, a transition structure 22, and an insulating structure 23. The transition structure 22 surrounds the electrode post body 21 and is connected to the first shell wall 111. The insulating structure 23 is insulatingly fitted between the transition structure 22 and the electrode post body 21. The electrode component 3 is connected to the electrode post body 21.

[0153] The adapter structure 22 surrounds the entire circumference of the electrode body 21 along the mounting hole 112, thereby connecting the electrode body 21 and the first shell wall 111 in the outer peripheral region of the electrode body 21. The insulating structure 23 insulates the mating position between the adapter structure 22 and the electrode body 21, preventing short circuits between them. The connection method between the adapter structure 22 and the first shell wall 111 is not limited; for example, it can be welded, riveted, drilled, or bonded. Furthermore, the electrode body 21 can be connected to the electrode component 3 via a conductive part 4. The connection method between the conductive part 4 and the electrode body 21 is also not limited; for example, it can be welded, riveted, drilled, or bonded.

[0154] In the above technical solution, the pole piece 2 has a simple structure and is easy to process. Since it includes two parts, the pole piece body 21 and the adapter structure 22, the shape and size of the pole piece body 21 and the adapter structure 22 can be designed separately based on different design considerations. For example, a racetrack-shaped adapter structure 22 can be used in conjunction with a circular pole piece body 21, or a racetrack-shaped adapter structure 22 can be used in conjunction with a racetrack-shaped pole piece body 21, to flexibly adapt to the connection requirements of different forms of housing parts 1 and electrode parts 3, thus increasing the applicability of the pole piece 2. "Racetrack-shaped" refers to an oblong shape, which can be roughly considered as consisting of a rectangle and two semicircles. The outline of the oblong shape can be roughly considered as the rectangle whose two short sides are replaced by two arcs.

[0155] For example, the adapter structure 22 can be configured to match the shape of the mounting hole 112. The shape of the mounting hole 112 can be designed as an elongated shape that facilitates the passage of the pole piece 2 and minimizes the rotation angle of the pole piece 2. At the same time, the pole piece body 21 can be designed as an elongated shape that matches the shape of the adapter structure 22, so that the pole piece body 21 has a larger area to connect with the conductive part 4. Alternatively, the pole piece body 21 can be designed as a circle that does not match the shape of the adapter structure 22, thereby reducing the connection area between the pole piece body 21 and the adapter structure 22, improving the uniformity of force at the connection between the pole piece body 21 and the adapter structure 22, and thus improving the connection reliability between the pole piece body 21 and the adapter structure 22.

[0156] Referring to Figure 6, in some embodiments of this application, the adapter structure 22 is formed as an elongated strip (e.g., rectangular, elliptical, racetrack-shaped, etc.) extending along the length direction of the first shell wall 111, and the outline shape of the electrode body 21 matches the outline shape of the adapter structure 22 (e.g., rectangular, elliptical, racetrack-shaped, etc.). As mentioned above, the electrode component 3 is connected to the electrode component 2 via the conductive part 4. When the outline shape of the electrode body 21 is formed as an elongated strip that matches the outline shape of the adapter structure 22, the area of ​​the electrode body 21 is larger, which is beneficial to increasing the connection area between the conductive part 4 and the electrode body 21, thereby improving the charging performance.

[0157] Referring to Figure 8, in some other embodiments of this application, the transition structure 22 is formed as an elongated strip (e.g., rectangular, elliptical, racetrack-shaped, etc.) extending along the length direction of the first shell wall 111, and the pole body 21 is located at the center of the length of the transition structure 22 and is circular. Therefore, when the pole body 21 is located at the center of the length of the elongated transition structure 22 and is circular, it is beneficial to reduce the connection area between the pole body 21 and the transition structure 22, and to ensure that the connection force between the pole body 21 and the transition structure 22 is evenly distributed on the circumference, thereby improving the uniformity of the force at the connection between the pole body 21 and the transition structure 22, and thus improving the connection reliability between the pole body 21 and the transition structure 22.

[0158] Please refer to Figures 8-11. In some embodiments of this application, the insulating structure 23 is also sealed between the adapter structure 22 and the terminal body 21. Since the housing component requires a sealing performance to prevent electrolyte leakage to the outside of the housing component, in some embodiments of this application, the insulating structure 23 is configured not only to insulate the adapter structure 22 from the terminal body 21, but also to ensure a sealed connection between the adapter structure 22 and the terminal body 21. This isolates the inside and outside of the housing component 1 after the adapter structure 22 is connected to the first housing wall 111, reducing the risk of electrolyte leakage from the connection between the adapter structure 22 and the terminal body 21 to the outside of the housing component 1, and reducing the risk of liquids or dust from outside the housing component 1 entering the housing component 1 from the connection between the adapter structure 22 and the terminal body 21, thereby improving the reliability of the battery cell 102.

[0159] If the terminal post body needs to be pressed against the sealing element placed on the first shell wall to achieve a seal between the first shell wall and the terminal post component, the pressure applied by the terminal post component to the first shell wall is likely to be relatively large. In cases where the shell wall thickness is thin, this can easily lead to deformation or damage to the first shell wall. In the above technical solution, by sealing the insulating structure 23 between the adapter structure 22 and the terminal post body 21, when sealing the battery cell 102, it is only necessary to connect the adapter structure 22 to the first shell wall 111, without applying significant pressure to the first shell wall 111. This reduces the stress on the first shell wall 111, protecting the shell component 1 and thus helping to reduce the wall thickness of the shell component 1 and lower material costs. Furthermore, since the first shell wall 111 is the end opposite the shell body 11 and the opening 113, the stress at the connection between the first shell wall 111 and the second shell wall 114, as well as the stress on the second shell wall 114, can be reduced. This helps to ensure the reliability of the shell body 11 and reduces the wall thickness and cost of the shell body 11.

[0160] Please refer again to Figures 8-11. In some embodiments of this application, the insulating structure 23 includes a sealing structure 231. In the embodiments of this application, the sealing structure 231 is made of a material that has both sealing and insulating properties, such as an elastic rubber component.

[0161] Please refer again to Figures 8-11. For example, at least a portion of the sealing structure 231 is clamped between the transition structure 22 and the pole body 21 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111.

[0162] In the embodiments of this application, the directions from the inner side to the outer side of the first shell wall 111, and the directions from the outer side to the inner side of the first shell wall 111, are collectively referred to as "the inner and outer directions of the first shell wall 111 (e.g., the fifth direction F5)". "The inner side of the first shell wall 111" refers to the side of the first shell wall 111 facing the electrode component 3, and "the outer side of the first shell wall 111" refers to the side of the first shell wall 111 away from the electrode component 3.

[0163] The sealing structure 231 includes at least a axial side portion 231a. The side of the axial side portion 231a facing the receiving cavity 13 is the inner side of the axial side portion 231a, and the side of the axial side portion 231a away from the electrode component 3 is the outer side of the axial side portion 231a. One of the transition structure 22 and the electrode body 21 is partially clamped on the outer side of the axial side portion 231a, and the other is partially clamped on the inner side of the axial side portion 231a. Thus, the axial side portion 231a is clamped between the transition structure 22 and the electrode body 21 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111 to achieve an axial seal between the transition structure 22 and the electrode body 21.

[0164] Therefore, by providing at least a portion of the sealing structure 231 sandwiched between the transition structure 22 and the pole body 21 in the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111, an axial seal is achieved between the transition structure 22 and the pole body 21. This axial seal provides a more reliable sealing effect and improves the leakage problem at the mating position of the transition structure 22 and the pole body 21. Furthermore, by integrating the axial seal (such as the axial side portion 231a) into the pole component, the axial force on the first shell wall 111 can be reduced in the embodiments of this application.

[0165] Please refer again to Figures 8-11. Exemplarily, the sealing structure 231 is circumferentially disposed on the side of the transition structure 22 facing the pole body 21 (i.e., the inner ring of the transition structure 22). In the embodiments of this application, since the transition structure 22 is arranged around the pole body 21 and connected to the first shell wall 111, the side of the transition structure 22 facing the pole body 21 is the "inner ring 2211 of the transition structure 22," and the side of the transition structure 22 facing the first shell wall 111 is the "outer ring 2212 of the transition structure 22." In the above technical solution, by circumferentially disposing the sealing structure 231 on the inner ring of the transition structure 22, the sealing structure 231 can approach the mating position between the transition structure 22 and the pole body 21. This facilitates sealing the mating position between the transition structure 22 and the pole body 21 via a shorter path, improving the reliability of the seal. Furthermore, it helps to reduce the size of the sealing structure 231, reduce the sealing area, and easily achieve compression sealing, making the seal less prone to failure and improving the sealing effect.

[0166] Furthermore, when the insulating structure 23 includes a sealing structure 231, which is sandwiched between the transition structure 22 and the pole body 21 to achieve a sealed fit between the transition structure 22 and the pole body 21, and the transition structure 22 is formed as an elongated strip extending along the length direction of the first shell wall 111, and the pole body 21 is located at the center of the length of the transition structure 22 and is circular, the force at the connection position between the transition structure 22 and the pole body 21 is uniform, making it easy to control the compression of the sealing structure 231, thereby improving the reliability of the sealed fit between the transition structure 22 and the pole body 21. Moreover, the sealing area is relatively small, making it less prone to failure.

[0167] Please refer again to Figures 8-11. In some embodiments of this application, the electrode body 21 includes a peripheral portion 212. The adapter structure 22 is clamped on both sides of the peripheral portion 212 in the inward and outward directions of the first shell wall 111 by the insulating structure 23. At least a portion of the sealing structure 231 is clamped between the side of the peripheral portion 212 facing the electrode component 3 and the adapter structure 22.

[0168] In this embodiment, the peripheral portion 212 can be the outer peripheral structure of the pole body 21. Since the sealing structure 231 is arranged around the periphery of the transition structure 22 facing the pole body 21, the sealing structure 231 can be clamped between the peripheral portion 212 and the transition structure 22.

[0169] In this embodiment, the side of the peripheral portion 212 facing away from the electrode component 3 is the outer side of the peripheral portion 212, and the side of the peripheral portion 212 facing the receiving cavity 13 is the inner side of the peripheral portion 212. The transition structure 22 is limited to the outer side of the peripheral portion 212 by the insulating structure 23 to restrict the movement of the electrode body 21 relative to the transition structure 22 in the direction away from the electrode component 3. The transition structure 22 is also limited to the inner side of the peripheral portion 212 by the insulating structure 23 to restrict the movement of the electrode body 21 relative to the transition structure 22 in the direction towards the receiving cavity 13. Thus, the transition structure 22 is clamped on both sides of the peripheral portion 212 by the insulating structure 23 in the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111.

[0170] In the above technical solution, the electrode post component 2 has a simple structure and is easy to process, which can easily and effectively achieve the relative fixation and insulating fit between the electrode post body 21 and the adapter structure 22. The sealing structure component 231 is clamped between the peripheral portion 212 of the electrode post body 21 and the adapter structure 22, so that the sealing structure component 231 can be positioned at the mating position between the adapter structure 22 and the electrode post body 21. This facilitates sealing at the mating position of the adapter structure 22 and the electrode post body 21 with a shorter path, improving the reliability of the seal. It also helps to reduce the size of the sealing structure component 231, reduce the sealing area, and facilitate compression sealing, making the seal less prone to failure and improving the sealing effect. Furthermore, since at least a portion of the sealing structure component 231 is clamped between the peripheral portion 212 facing the electrode component 3 and the adapter structure 22, the sealing structure component 231 can seal from the peripheral portion 212 facing the receiving cavity 13, which can more effectively suppress electrolyte leakage from the mating position between the electrode post body 21 and the adapter structure 22, thereby improving the sealing effect.

[0171] Referring again to Figure 11, exemplarily, the insulating structure 23 further includes a first insulating member 232. The transition structure 22 is clamped to both sides of the peripheral portion 212 along the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111 via the first insulating member 232 and the sealing structure member 231. In this embodiment, the configuration of the transition structure 22 is not limited; it can be a single component or a combination of multiple components (e.g., two or more).

[0172] Since at least a portion of the sealing structure 231 (such as the axial portion 231a) is located on the side of the peripheral portion 212 facing the electrode component 3, at least a portion of the first insulating member 232 is located on the side of the peripheral portion 212 away from the electrode component 3. The transition structure 22 can be clamped on both sides of the peripheral portion 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the first insulating member 232 and the sealing structure 231 respectively.

[0173] In the above technical solution, since the insulation structure 23 includes a first insulating component 232 and a sealing structure component 231 that are not integrated into a single piece, the design and processing of the insulation structure 23 can be simplified. Furthermore, depending on the specific requirements for cooperation with the pole body 21 and the adapter structure 22, the first insulating component 232 can be set as a basically incompressible insulating component without sealing effect (e.g., a plastic component), or it can be set as a compressible sealing component with sealing effect (e.g., an elastic rubber component), thereby meeting different practical requirements. In addition, when the first insulating component 232 is a basically incompressible insulating component without sealing effect (e.g., a plastic component), the compression amount of the sealing structure component 231 is easily controlled, improving the sealing effect.

[0174] Alternatively, in some other embodiments of this application, the sealing structure 231 can also be a single-piece structure with an outer periphery 212, located on the side of the periphery 212 facing the electrode component 3 and the side facing away from the electrode component 3, respectively. The transition structure 22 can be clamped on both sides of the periphery 212 by the sealing structure 231 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111. That is, the sealing structure 231 is a single-piece annular structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the periphery 212, respectively. In this way, the transition structure 22 can be clamped on both sides of the periphery 212 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the two axial side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is a single-piece structure with an outer periphery 212, the number of parts and assembly processes can be reduced.

[0175] Please refer again to Figures 8-11. In some embodiments of this application, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222. The second adapter ring 222 is disposed on the side of the first adapter ring 221 away from the electrode component 3. The second adapter ring 222 is connected to the first adapter ring 221, and the first adapter ring 221 is connected to the first shell wall 111. The sealing structure 231 is clamped between the first adapter ring 221 and the peripheral portion 212. The second adapter ring 222 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232.

[0176] For example, the first adapter ring 221 and the second adapter ring 222 can be welded, riveted, drilled, or bonded together. For instance, the outer ring of the first adapter ring 221 can be welded, riveted, drilled, or bonded to the first shell wall 111. Exemplarily, both the first adapter ring 221 and the second adapter ring 222 are made of aluminum and are welded together. The first adapter ring 221 and the first shell wall 111 are both made of aluminum and are welded together, which helps improve the welding yield.

[0177] Therefore, the adapter structure 22 includes a first adapter ring 221 and a second adapter ring 222 that are arranged internally and externally and assembled together, which facilitates the assembly and connection of the adapter structure 22 with the insulation structure 23 and the pole body 21, making the pole component 2 easy to process and manufacture, and making it easy to control the compression of the sealing structure component 231, thereby improving the sealing reliability.

[0178] The method by which the second adapter ring 222 is insulated from and fixedly fitted to the peripheral portion 212 via the first insulating member 232 is not limited. For example, referring again to Figures 8-11, the first insulating member 232 can be injection molded to insulate the second adapter ring 222 and the peripheral portion 212. As another example, referring to Figure 12, which is a cross-sectional view of a pole post component provided in some embodiments of this application, the second adapter ring 222 may include a stop ring portion 2221. At least a portion of the first insulating member 232 is clamped between the stop ring portion 2221 and the peripheral portion 212 along the inward and outward directions (e.g., the fifth direction F5) of the first shell wall 111. The material of the first insulating member 232 is not limited; for example, it can be a plastic part or an elastic rubber part.

[0179] Referring again to Figure 11, the adapter structure 22, by way of example, further includes a first insulating frame 224, which is connected to the side of the first adapter ring 221 facing the electrode component 3. Thus, the first insulating frame 224 can serve as insulation between the electrode component 3 and the first adapter ring 221, reducing the difficulty of setting up the insulation structure here. By way of example, the first insulating frame 224 has a pin, and the first adapter ring 221 has a hole; the pin is interference-fitted into the hole to achieve the connection between the first insulating frame 224 and the first adapter ring 221.

[0180] Please refer to Figure 13, which is a cross-sectional view of the pole member provided in some embodiments of this application. In some embodiments of this application, the adapter structure 22 includes a third adapter ring 223, which includes an integrally formed inner extension 2231 and an outer extension 2232. That is, the inner extension 2231 and the outer extension 2232 are different parts of a single integral piece, rather than two separate parts that are assembled together.

[0181] The inner extension 2231, facing the pole body 21 (i.e., the inner ring of the inner extension 2231), and the outer extension 2232, facing the pole body 21 (i.e., the inner ring of the outer extension 2232), are spaced apart in the inner and outer directions, respectively, by the insulating structure 23 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111, and clamped on both sides of the peripheral portion 212. The sealing structure 231 is clamped between the inner extension 2231 and the peripheral portion 212, and the outer extension 2232 is insulated from and fixedly fitted to the peripheral portion 212 by the first insulating member 232.

[0182] The connection method between the third adapter ring 223 and the first shell wall 111 is not limited; for example, it can be welded, riveted, drilled, or bonded. For example, both the third adapter ring 223 and the first shell wall 111 are made of aluminum and are welded together, which helps to improve the welding yield.

[0183] The method by which the outer extension 2232 is insulated from and fixedly engaged with the peripheral portion 212 by the first insulating member 232 is not limited. For example, referring again to FIG13, the outer extension 2232 rivets the first insulating member 232 against the peripheral portion 212. The material of the first insulating member 232 is not limited, for example, it can be a plastic part or an elastic rubber part. As another example, referring to FIG14, FIG14 is a cross-sectional view of the pole post component provided in some embodiments of this application; the first insulating member 232 and the pole post body 21, as well as the first insulating member 232 and the outer extension 2232 are respectively injection molded. The inner extension 2231 rivets the sealing structure member 231 against the peripheral portion 212.

[0184] Referring again to Figure 14, the adapter structure 22 further includes a second insulating frame 225, which is connected to the side of the third adapter ring 223 facing the electrode component 3. Thus, the second insulating frame 225 can serve as insulation between the electrode component 3 and the third adapter ring 223, eliminating the need for a separate insulating structure. Exemplarily, the second insulating frame 225 has a pin, and the third adapter ring 223 has a socket; the pin is interference-fitted into the socket to connect the second insulating frame 225 and the third adapter ring 223.

[0185] Please refer to Figures 15 and 16. Figure 15 is a cross-sectional view of a battery cell provided in some embodiments of this application; Figure 16 is a cross-sectional view of a battery cell provided in some embodiments of this application. In some embodiments of this application, the adapter structure 22 includes a mating ring portion 2271, the terminal body 21 includes a through portion 214 passing through the mating ring portion 2271, and an inner limiting portion 215 and an outer limiting portion 216 connected to the through portion 214 and clamped on the inner and outer sides of the mating ring portion 2271. At least a portion of the sealing structure 231 is clamped between the mating ring portion 2271 and the inner limiting portion 215.

[0186] For example, the adapter structure 22 includes a fourth adapter ring 227, which includes a mating ring portion 2271 and is connected to the first shell wall 111, for example, the outer ring of the fourth adapter ring 227 is connected to the first shell wall 111. The connection method between the fourth adapter ring 227 and the first shell wall 111 is not limited; for example, it can be welded, riveted, drilled, glued, etc. For example, both the fourth adapter ring 227 and the first shell wall 111 are made of aluminum and are welded together, which helps to improve the welding yield.

[0187] In the above technical solution, the electrode post component 2 has a simple structure and is easy to process, which can easily and effectively achieve the relative fixation and insulating fit between the electrode post body 21 and the adapter structure 22. The sealing structure 231 is clamped by the mating position of the electrode post body 21 and the mating ring 2271, so that the sealing structure 231 can be positioned at the mating position between the adapter structure 22 and the electrode post body 21. This facilitates sealing at the mating position of the adapter structure 22 and the electrode post body 21 with a shorter path, improving the reliability of the seal. It also helps to reduce the size of the sealing structure 231, reduce the sealing area, and facilitate compression sealing, making the seal less prone to failure and improving the sealing effect. Furthermore, since at least a portion of the sealing structure 231 is clamped between the mating ring 2271 and the inner limiting part 215, the sealing structure 231 can seal from the side of the mating ring 2271 facing the receiving cavity 13, which can more effectively suppress electrolyte leakage from the mating position between the electrode post body 21 and the adapter structure 22, thereby improving the sealing effect.

[0188] Please refer again to Figure 15. The insulating structure 23 may also include a second insulating member 234, wherein at least a portion of the sealing structure 231 is clamped between the inner limiting portion 215 and the mating ring portion 2271, and at least a portion of the second insulating member 234 is clamped between the outer limiting portion 216 and the mating ring portion 2271.

[0189] In the above technical solution, since the insulation structure 23 includes a second insulating component 234 and a sealing structure component 231 that are not integrated into a single piece, the design and processing of the insulation structure 23 can be simplified. Furthermore, depending on the specific requirements for cooperation with the pole body 21 and the adapter structure 22, the second insulating component 234 can be set as a basically incompressible insulating component without sealing effect (e.g., a plastic component), or it can be set as a compressible sealing component with sealing effect (e.g., an elastic rubber component), thereby meeting different practical requirements. In addition, when the second insulating component 234 is a basically incompressible insulating component without sealing effect (e.g., a plastic component), the compression amount of the sealing structure component 231 is easily controlled, improving the sealing effect.

[0190] Alternatively, referring to Figure 16; in some other embodiments of this application, the sealing structure 231 can also be an integral structure with a mating ring 2271 surrounding it, located on the side of the mating ring 2271 facing the electrode component 3 and the side facing away from the electrode component 3, respectively. The electrode post body 21 is clamped on both sides of the mating ring 2271 by the sealing structure 231 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111. That is, the sealing structure 231 is an integral ring structure, which has both insulation and sealing properties. The sealing structure 231 includes axial side portions 231a located on the inner and outer sides of the mating ring 2271, respectively. In this way, the transition structure 22 can be clamped on both sides of the mating ring 2271 along the inner and outer directions (e.g., the fifth direction F5) of the first shell wall 111 by the two axial side portions 231a of the sealing structure 231. In the above technical solution, since the sealing structure 231 is an integral structure and surrounds the mating ring 2271, the number of parts and assembly steps can be reduced.

[0191] In the embodiments of this application, when the pole body 21 includes a through portion 214, and an inner limiting portion 215 and an outer limiting portion 216 connected to the through portion 214 and clamped on both sides of the mating ring portion 2271, the configuration of the pole body 21 is not limited. It can be a single part or a combination of multiple parts (such as two or more).

[0192] For example, referring again to Figure 15, the outer limiting part 216 and the through part 214 are assembled and connected on the side of the mating ring 2271 opposite to the inner limiting part 215. The assembly and connection method of the outer limiting part 216 and the through part 214 is not limited; for example, welding, drilling, adhesive bonding, etc., are all acceptable. Assembly and connection refers to the connection of two parts together through a connection process. Therefore, by setting the outer limiting part 216 and the through part 214 as separate parts and assembling them, the structure of the pole body 21 is simple and easy to assemble and connect with the transition structure 22. Furthermore, when the outer limiting part 216 and the through part 214 are welded, the thermal impact on the sealing structure 231 clamped between the inner limiting part 215 and the mating ring 227 can be reduced, improving the sealing reliability of the sealing structure 231.

[0193] In the above embodiments, the connection method between the through-hole portion 214 and the inner limiting portion 215 is not limited; they can be an integral part or separate parts pre-connected together. For example, the end of the through-hole portion 214 facing away from the inner limiting portion 215 may include a riveting portion 2141. During assembly, the through-hole portion 214 can be inserted through the mating ring portion 2271 fitted with the insulating structure 23 along the direction from the inner limiting portion 215 to the outer limiting portion 216. Then, the riveting portion 2141 is riveted to restrict the through-hole portion 214 from disengaging along the direction from the outer limiting portion 216 to the inner limiting portion 215. Afterward, the riveting portion 2141 and the outer limiting portion 216 can be connected, facilitating the connection between the through-hole portion 214 and the outer limiting portion 216, for example, by welding. Alternatively, the riveting portion 2141 can be omitted, eliminating the riveting process after the through-hole portion 214 is inserted.

[0194] For example, please refer again to Figure 16; in some other embodiments of this application, the outer limiting part 216 and the through part 214 are integral parts, and the outer limiting part 216 rivets the second insulating member 234 against the mating ring part 2271. In the above technical solution, the assembly connection between the outer limiting part 216 and the insulating structure 23 and the transition structure 22 is achieved by riveting, which reduces the thermal impact of the heat generated when the outer limiting part 216 is connected to the insulating structure 23 and the transition structure 22 on the sealing structure member 231, and improves the sealing reliability of the sealing structure member 231. In addition, by riveting the outer limiting part 216 to press the second insulating member 234 against the mating ring part 2271, the compression amount of the sealing structure member 231 can be easily controlled, achieving a better compression effect.

[0195] In the above embodiments, the connection method between the through-hole portion 214 and the inner limiting portion 215 is not limited; they can be an integral part or separate parts pre-connected together. For example, during assembly, the through-hole portion 214 can be threaded through the mating ring portion 2271 fitted with the insulating structure 23 along the direction from the inner limiting portion 215 to the outer limiting portion 216, and then the outer limiting portion 216 can be riveted to restrict the relative movement between the pole member 21 and the transition structure 22.

[0196] The pole body 21 can be a solid structure or a hollow structure. For example, when the pole body 21 is a hollow structure, please refer to Figure 16; the pole body 21 includes a first pole member 21a and a second pole member 21b. The second pole member 21b is composed of a through part 214, an inner limiting part 215 and an outer limiting part 216, and is installed on the first shell wall 111. The through-hole 214 surrounds the first shell wall 111 and extends through the mating hole 21b1 in the inner and outer directions. The first electrode post 21a is assembled on the side of the second electrode post 21b away from the electrode component 3 and covers the mating hole 21b1, so as to form an open receiving space between the first electrode post 21a and the second electrode post 21b in the direction of the electrode component 3. A portion of the conductive part 4 can extend into the receiving space and connect to the first electrode post 21a, so that the electrode post body 21 can play the role of storing the conductive part 4, thereby reducing the space occupied by the conductive part 4 in the receiving cavity 13 and improving the energy density of the battery cell 102.

[0197] Referring again to Figure 15, in some embodiments of this application, the adapter structure 22 further includes a third insulating frame 228, which is connected to the side of the fourth adapter ring 227 facing the electrode component 3. Thus, the third insulating frame 228 can serve as insulation between the electrode component 3 and the fourth adapter ring 227, eliminating the need for a separate insulating structure. Exemplarily, the third insulating frame 228 has a pin, and the fourth adapter ring 227 has a socket; the pin is interference-fitted into the socket to connect the third insulating frame 228 and the fourth adapter ring 227.

[0198] Please refer to Figure 17, which is a cross-sectional view of a battery cell provided in some embodiments of this application. In some embodiments of this application, the first shell wall 111 has a mounting hole 112, and a sealing ring 14 is provided around the mounting hole 112. The sealing ring 14 is clamped between the terminal post component 2 and the first shell wall 111. Thus, the terminal post component 2 has a simple structure, is easy to process, and is easy to assemble and connect with the first shell wall 111.

[0199] In some embodiments of this application, the first shell wall 111 has a mounting hole 112, the pole post component 2 is covered by the mounting hole 112, and the edge of the transition structure 22 overlaps with one side of the wall thickness direction of the first shell wall 111. In this way, by covering one side of the wall thickness direction of the first shell wall 111, that is, covering the outside of the first shell wall 111, or covering the inside of the first shell wall 111, the assembly of the transition structure 22 and the first shell wall 111 is facilitated.

[0200] Exemplarily, the adapter structure 22 is welded to the first shell wall 111. For example, after the adapter structure 22 is placed on the first shell wall 111, the adapter structure 22 and the first shell wall 111 can be connected by welding, which facilitates processing and ensures better reliability of the connection between the adapter structure 22 and the first shell wall 111. For example, welding can be performed from the outside of the first shell wall 111 so that the weld formed by the connection is exposed on the side of the first shell wall 111 away from the electrode component 3 (i.e., the side away from the active material coating portion 32), thereby facilitating welding operations and increasing the welding space. This application is not limited to this. For example, in some other embodiments of this application, the adapter structure 22 can also be configured to pass through the mounting hole 112 and be riveted to the first shell wall 111, etc.

[0201] Please refer to Figures 18 and 19. Figure 18 is a partial cross-sectional view of a battery cell 102 provided in some embodiments of this application, in which the terminal component 2 is in a state before being covered by the first shell wall 111; Figure 19 is a state diagram of the terminal component 2 after being covered by the first shell wall 111 as shown in Figure 18.

[0202] Referring to Figures 18 and 19, in some embodiments, when the electrode component 3 is connected to the electrode post component 2 first, and then the electrode post component 2 is assembled and connected to the first shell wall 111, the electrode component 3 and the electrode post component 2 can be connected after the electrode component 3 and the electrode post component 2 are connected (for example, the electrode post component 2 and the electrode component 3 can be connected first, then installed together into the shell 11, and then the electrode post component 2 can be extended from the mounting hole 112 to the outside of the first shell wall 111; or, for example, the electrode component 3 is installed into the shell 11, the conductive part 4 passes through the mounting hole 112, and is connected to the electrode post component 2 which is pre-set on the outside of the first shell wall 111), and the electrode post component 2 is covered at the mounting hole 112 of the first shell wall 111 from the outside of the first shell wall 111 (i.e., the side away from the active material coating part 32). At this time, the edge of the adapter structure 22 overlaps the side of the first shell wall 111 away from the electrode component 3. Therefore, since the pole post 2 is covered by the first housing wall 111 from the outside, it is convenient to assemble and connect the pole post 2 with the first housing wall 111, which helps to improve the connection reliability between the pole post 2 and the first housing wall 111.

[0203] Referring to Figures 18 and 19, in some embodiments of this application, when the edge of the adapter structure 22 overlaps with the side of the first shell wall 111 facing away from the electrode component 3, a first recess 1111 surrounding the mounting hole 112 can be provided on the first shell wall 111. The first recess 1111 is open in the direction facing away from the electrode component 3 (that is, the first recess 1111 is open in the direction facing away from the active material coating portion 32). The edge of the adapter structure 22 is embedded in the first recess 1111, wherein the edge of the adapter structure 22 has a flange portion 22a surrounding the adapter structure 22, and the flange portion 22a is embedded in the first recess 1111. This facilitates the support and positioning of the connection between the adapter structure 22 and the first shell wall 111, and is beneficial for welding the two together from the outside of the first shell wall 111 (that is, the side facing away from the active material coating portion 32).

[0204] Referring again to Figures 18 and 19, exemplarily, the thickness of the flange 22a matches the depth T1 of the first groove 1111. "Matching" means that the thickness of the flange 22a is substantially the same as the depth of the first groove 1111. This facilitates welding the flange 22a to the first shell wall 111. The thickness of the flange 22a relative to the depth of the first groove 1111 is not too large, reducing unnecessary space occupation; nor is the thickness of the flange 22a relative to the depth of the first groove 1111 too small, meeting welding strength requirements.

[0205] For example, referring to Figure 6, and in conjunction with Figures 18 and 19, the ratio of the width W2 of the electrode post 2 to its length L2 satisfies 10% to 60%, a range applicable to both the positive and negative electrode post 2. Further, the ratio of the width W2 to the length L2 of the electrode post 2 can also satisfy 25% to 40%, for example, if the width W2 of the electrode post 2 is approximately 21 mm, and the length L2 of the electrode post 2 is approximately 63 mm, then the ratio of the width W2 to the length L2 of the electrode post 2 is approximately 33%.

[0206] Therefore, by setting the ratio of the width W2 of the electrode component 2 to the length L2 of the electrode component 2 to be 10% to 60%, the overall area of ​​the electrode component 2 can be relatively large, which is beneficial to ensure that the electrical connection area between the electrode component 2 and the electrode component 3 can meet the relatively large requirements. At the same time, the width of the electrode component 2 is relatively small compared to its length. Thus, when connecting the electrode component 2 and the electrode component 3, the electrode component 2 can be placed with one edge of its width facing the active material coating part 32. Since the width of the electrode component 2 is small, it is beneficial to shorten the distance between the electrode component 2 and the active material coating part 32, thereby shortening the length of the conductive part 4 and reducing the redundancy of the conductive part 4.

[0207] For example, referring to Figure 6, the terminal component 2 can be configured such that the ratio of the width W2 of the terminal component 2 to the width W1 of the first shell wall 111 is 20% to 90%, a range applicable to both the positive and negative terminal components 2. Further, the ratio of the width W2 of the terminal component 2 to the width W1 of the first shell wall 111 is 70% to 80%, for example, the width W2 of the terminal component 2 is approximately 21 mm, and the width W1 of the first shell wall 111 is approximately 28 mm, resulting in a ratio of approximately 75%. This facilitates full utilization of the space in the width direction of the first shell wall 111 by the terminal component 2. For example, the width W1 of the first shell wall 111 is consistent with the dimension of the battery cell 102 in the width direction of the first shell wall 111, for example, as shown in Figure 3, the width of the first shell wall 111 is consistent with the dimension of the battery cell 102 in the second direction F2.

[0208] For example, referring to Figure 6, when two pole pieces 2 are provided on the first shell wall 111 at intervals along its length, the ratio of the length L2 of the pole piece 2 to the length L1 of the first shell wall 111 is 25% ± 15% (i.e., 10% to 40%). This range applies to both the positive and negative pole pieces 2. Further, the ratio of the length L2 of the pole piece 2 to the length L1 of the first shell wall 111 is 15% to 30%. For example, if the length L2 of the pole piece 2 is approximately 63 mm and the length L1 of the first shell wall 111 is approximately 297 mm, the ratio is approximately 21%. This allows the pole piece 2 to fully utilize the space along the length of the first shell wall 111. For example, the length L1 of the first shell wall 111 is consistent with the dimension of the battery cell 102 in the length direction of the first shell wall 111. For example, as shown in FIG3, the length of the first shell wall 111 is consistent with the dimension of the battery cell 102 in the third direction F3.

[0209] For example, referring to FIG20, the shape of the mounting hole 112 matches the outline shape of the pole member 2. For example, when the pole member 2 includes the adapter structure 22, the outline shape of the adapter structure 22 (i.e. the outer ring shape of the adapter structure 22) matches the shape of the mounting hole 112, which is beneficial to the connection between the pole member 2 and the first shell wall 111, and also beneficial to expose more area of ​​the pole member 2 in the direction of the receiving cavity 13, which is beneficial to the reception of the conductive part 4 and / or connection with the conductive part 4.

[0210] For example, the shape of the mounting hole 112 matches the outline shape of the pole member 2, and is orthographically projected onto a projection plane perpendicular to the thickness direction of the first shell wall 111. The orthographic projection of the mounting hole 112 on the projection plane falls completely within the orthographic projection range of the pole member 2 on the projection plane, thereby making the first shell wall 111 and the pole member 2 have a certain overlapping area, which is beneficial to the simple and reliable connection between the two.

[0211] Figure 20 is an exploded view of a portion of the battery cell provided in some embodiments of this application. Referring to Figures 18-20, in some embodiments of this application, the mounting hole 112 is an elongated hole (e.g., rectangular, elliptical, or racetrack-shaped), and the electrode post 2 is formed as an elongated structure (e.g., rectangular, elliptical, or racetrack-shaped) that matches the shape of the mounting hole 112. When the electrode post 2 is first connected to the electrode post 3, and then the electrode post 2 and electrode post 3 are installed together into the housing 11, and then the electrode post 2 extends from the mounting hole 112 to the outside of the first housing wall 111, and then the electrode post 2 is flipped over from the outside of the first housing wall 111 to cover the mounting hole 112, and then the electrode post 2 is connected to the first housing wall 111, if the electrode post 2 is set as an elongated structure that matches the shape of the mounting hole 112, the electrode post 2 can be adjusted so that its thickness direction is parallel to the width direction of the mounting hole 112 (e.g., as shown in Figure 20). The second direction F2) approaches the mounting hole 112 at an angle. After the pole member 2 passes through the mounting hole 112, the thickness direction of the pole member 2 is rotated to approach the thickness direction of the first shell wall 111 (for example, the first direction F1 shown in FIG20). In this way, the space required for the flipping movement of the pole member 2 is smaller, which can reduce the space required for the flipping of the pole member 2, thereby helping to shorten the length of the conductive part 4, save materials, reduce costs, and reduce the redundancy of the conductive part 4, reduce the space occupied by the conductive part 4 in the receiving cavity 13, which is beneficial to improving the energy density of the battery cell 102.

[0212] Please refer to Figures 21 and 22. Figure 21 is a partial cross-sectional view of a battery cell 102 provided in some embodiments of this application, in which the terminal component 2 is in a state before being covered by the first shell wall 111; Figure 22 is a state diagram of the terminal component 2 after being covered by the first shell wall 111 as shown in Figure 21.

[0213] Referring to Figures 21 and 22, in some embodiments, when the electrode component 3 is connected to the electrode post component 2 first, and then the electrode post component 2 is assembled and connected to the first shell wall 111, the electrode component 3 and the electrode post component 2 can be installed together into the shell body 11 after the connection. This allows the electrode post component 2 to be placed over the mounting hole 112 of the first shell wall 111 from the inside (i.e., the side facing the active material coating portion 32). At this time, the edge of the adapter structure 22 overlaps with the side of the first shell wall 111 facing the electrode component 3. Therefore, since the electrode post component 2 is located from the inside of the first shell wall 111 within the mounting hole 112, the electrode component 3 and the electrode post component 2 can be installed together into the shell body 11 without the electrode post component 2 needing to pass through the mounting hole 112, thus reducing the number of operation steps and lowering the operational difficulty.

[0214] Referring to Figures 21 and 22, in some embodiments of this application, when the edge of the adapter structure 22 overlaps with the side of the first shell wall 111 facing the electrode component 3, the edge of the adapter structure 22 has a second recess 22b that opens in the direction away from the electrode component 3 (i.e., the second recess 22b opens in the direction away from the active material coating portion 32). The first shell wall 111 includes an overlapping portion 1112 protruding into the mounting hole 112, and the overlapping portion 1112 is embedded in the second recess 22b. This facilitates the support and positioning of the connection between the electrode component 2 and the first shell wall 111, and allows for welding the two together from the outside of the first shell wall 111 (i.e., the side away from the active material coating portion 32).

[0215] Referring again to Figures 21 and 22, exemplarily, the thickness of the overlapping portion 1112 matches the groove depth T2 of the second sinker 22b. Here, "matching" means that the thickness of the overlapping portion 1112 is substantially the same as the groove depth of the second sinker 22b. This facilitates welding the overlapping portion 1112 to the first shell wall 111. The thickness of the overlapping portion 1112 relative to the groove depth of the second sinker 22b is not too large, reducing unnecessary space occupation; nor is the thickness of the overlapping portion 1112 relative to the groove depth of the second sinker 22b too small, thus meeting welding strength requirements.

[0216] In some embodiments of this application, referring again to FIG5, the electrode post 2 forms a receiving groove 5 that is recessed relative to the first shell wall 111 in a direction away from the electrode post 3 and open in a direction towards the electrode post 3. The electrode post 3 is connected to the electrode post 2 via a conductive part 4, at least a portion of which is accommodated in the receiving groove 5 and connected to the electrode post body 21. That is, the electrode post 2 forms the receiving groove 5, the groove wall of the receiving groove 5 is formed by the electrode post 2, the receiving groove 5 is recessed in a direction away from the active material coating part 32, and the receiving groove 5 is open in a direction towards the active material coating part 32, so that the receiving groove 5 communicates with the receiving cavity 13.

[0217] Therefore, by providing a receiving groove 5 to accommodate the conductive part 4, the space occupied by the conductive part 4 in the receiving cavity 13 can be reduced, allowing the receiving cavity 13 to have a larger space to accommodate the active material coating part 32. This is beneficial for increasing the volume of the active material coating part 32, thereby increasing the energy density of the battery cell 102. Moreover, since the receiving groove 5 is open towards the electrode component 13, the conductive part 4 can be easily inserted into the receiving groove 5, reducing the difficulty of operation.

[0218] For example, referring again to FIG5, the receiving groove 5 is formed on the side of the electrode component 3 (i.e. the side facing the active material coating portion 32) of the electrode body 21 and the transition structure 22. The transition structure 22 protrudes relative to the first shell wall 111 in the direction away from the electrode component 3 (i.e. the direction away from the active material coating portion 32), so that the receiving groove 5 is recessed relative to the first shell wall 111 in the direction away from the electrode component 3.

[0219] Therefore, by processing the adapter structure 22 into an outwardly protruding shape, a portion of the receiving groove 5 is formed on the side of the pole body 21 facing the electrode component 3, and another portion of the receiving groove 5 is formed on the side of the adapter structure 22 facing the electrode component 3. The receiving groove 5 has a shape that is concave relative to the first shell wall 111 in the direction away from the electrode component 3. Thus, both the side of the pole body 21 facing the electrode component 3 and the side of the adapter structure 22 facing the electrode component 3 have a space receiving groove conductive part 4. This not only facilitates the storage of the conductive part 4 to a greater extent, but also facilitates the design of diverse forms of the conductive part 4.

[0220] In other embodiments of this application, referring to FIG14, when the adapter structure 22 does not bulge relative to the first shell wall 111 in the direction away from the electrode component 3 (i.e., the direction away from the active material coating portion 32), the receiving groove 5 can be defined by the height difference between the adapter structure 22 and the electrode body 21 in the direction away from the electrode component 3 relative to the first shell wall 111.

[0221] In some embodiments of this application, referring again to FIG5, the surface of the end of the electrode body 21 facing the electrode component 3 is the inner end face 211 of the electrode body 21. The inner end face 211 of the electrode body 21 forms the receiving groove 5, and the conductive part 4 is connected to the inner end face 211 of the electrode body 21. That is, at least a portion of the inner end face 211 of the electrode body 21 defines the groove wall of the receiving groove 5, and the conductive part 4 is connected to the portion of the inner end face 211 of the electrode body 21 that serves as the groove wall of the receiving groove 5. In the above technical solution, at least a portion of the receiving groove 5 is formed by the side surface of the electrode body 21 facing the electrode component 3, and the conductive part 4 housed in the receiving groove 5 can easily contact and connect to the electrode body 21, improving connection convenience and simplifying the structure.

[0222] For example, when at least a portion of the conductive part 4 is accommodated in the receiving groove 5, the pole connecting portion of the conductive part 4 (e.g., the tab 33 or conductive member 41) (e.g., the folding portion 313 of the tab 33 described herein, or the second connecting segment 412 or the first conductive segment 415 of the conductive member 41) can be laid on the inner end face 211 of the pole body 21 and connected to the inner end face 211 of the pole body 21. During processing, the pole connecting portion of the conductive part 4 can be first inserted into the receiving groove 5, and then the pole connecting portion can be laid on the inner end face 211 of the pole body 21 and connected to the inner end face 211 of the pole body 21.

[0223] For example, the conductive part 4 may include a pole connection part, which may be a relatively rigid plate shape, such as one that will not bend or deform downward under the action of gravity, such as the folding part 313 of the tab 33 described herein (such as an ultrasonic weld), or the second connecting section 412 (such as a metal sheet) or the first conductive section 415 (such as a metal sheet) of the conductive member 41.

[0224] For example, referring to FIG5, regardless of whether the adapter structure 22 protrudes relative to the first shell wall 111 in a direction away from the electrode component 3, the position of the inner end face 220 of the adapter structure 22 adjacent to the electrode body 21 is a surrounding region 2201 surrounding the electrode body 21, and the surrounding region 2201 is flush with the inner end face 211 of the electrode body 21. The inner end face 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a protruding shape, and the outermost ring of the inner end face 220 of the adapter structure 22 facing the electrode body 21 is the surrounding region 2201.

[0225] For example, referring to Figures 6 and 7, when the inner end face 211 of the pole body 21 is set to be large (for example, the transition structure 22 is formed as an elongated strip extending along the length direction of the first shell wall 111, and the outline shape of the pole body 21 matches the outline shape of the transition structure 22), and when the surrounding area 2201 is flush with the inner end face 211 of the pole body 21, the pole connecting portion of the conductive part 4 (for example, the folding portion 313 of the tab portion 33 described herein, or the second connecting segment 412 of the conductive member 41) can be completely laid flat on the inner end face 211 of the pole body 21.

[0226] For example, referring to Figures 8 and 12, when the inner end face 211 of the pole body 21 is small (for example, the transition structure 22 is set as an elongated strip extending along the length direction of the first shell wall 111, and the pole body 21 is located in the center of the transition structure 22 and has a circular outline), and when the surrounding area 2201 is flush with the inner end face 211 of the pole body 21, a portion of the pole connection portion of the conductive part 4 (for example, the folding portion 313 of the electrode ear portion 33 described herein, or the second connecting segment 412 of the conductive member 41) can be laid flat on the inner end face 211 of the pole body 21, and the remaining portion can be laid flat on the surrounding area 2201, so that the pole connection portion of the conductive part 4 (for example, the pole connection portion is also elongated) can be supported as a whole, which facilitates the clamping of the welding nozzle, so that the conductive part 4 can be reliably connected to the pole body 21.

[0227] For example, the conductive part 4 may include a pole connection part, which may be a relatively rigid plate shape, such as one that will not bend or deform downward under the action of gravity, such as the folding part 313 of the tab 33 described herein (such as an ultrasonic weld), or the second connecting section 412 (such as a metal sheet) or the first conductive section 415 (such as a metal sheet) of the conductive member 41.

[0228] For example, referring to FIG13, regardless of whether the adapter structure 22 protrudes relative to the first shell wall 111 in a direction away from the electrode component 3, the position of the inner end face 220 of the adapter structure 22 adjacent to the electrode body 21 is a surrounding region 2201 surrounding the electrode body 21, and the inner end face 211 of the electrode body 21 protrudes out of the surrounding region 2201 in a direction towards the electrode component 3. The inner end face 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a protruding shape, and the outermost ring of the inner end face 220 of the adapter structure 22 facing the electrode body 21 is the surrounding region 2201.

[0229] Therefore, by setting the inner end face 211 of the electrode body 21 to protrude out of the surrounding area 2201 in the direction of the electrode component 3, the electrode body 21 can be retracted inward in the direction of the receiving cavity 13 when the height of the electrode body 21 is constant, so as to reduce the space occupied by the electrode component 2 on the outside of the housing component 1 and reduce the size of the battery cell 102 in the direction of setting the electrode component 2 (for example, the first direction F1 shown in FIG3).

[0230] For example, when the inner end face 211 of the electrode body 21 is set to be large (for example, the transition structure 22 is formed as an elongated strip extending along the length direction of the first shell wall 111, and the outline shape of the electrode body 21 matches the outline shape of the transition structure 22), and when the inner end face 211 of the electrode body 21 protrudes from the surrounding area 2201 in the direction of the electrode component 3, the electrode connection portion of the conductive part 4 (for example, the folding portion 313 of the electrode tab portion 33 described herein, or the second connection segment 412 of the conductive member 41) can be completely laid flat on the inner end face 211 of the electrode body 21.

[0231] For example, referring to FIG13, when the inner end face 211 of the electrode body 21 is small (for example, the transition structure 22 is set as an elongated strip extending along the length direction of the first shell wall 111, the electrode body 21 is located in the center of the transition structure 22 and has a circular outline), and when the inner end face 211 of the electrode body 21 protrudes from the surrounding area 2201 in the direction of the electrode component 3, the conductive part 4 can be set to include the tab 33 and the conductive member 41 connected to the tab 33. The conductive member 41 includes a first conductive segment 415 laid on the inner end face 211 of the electrode body 21 and a second conductive segment 416 offset from the inner end face 211 of the electrode body 21. The second conductive segment 416 protrudes from the first conductive segment 415 in the direction away from the electrode component 3 (i.e., towards the outside, or towards the direction away from the active material coating part 32). The tab 33 is connected to the second conductive segment 416. Therefore, the height difference between the inner end face 211 of the electrode body 21 and the surrounding area 2201 can be used to accommodate the second conductive segment 416 and the tab 33 of the conductive element 41, thereby making full use of space, reducing the space occupied by the conductive part 4 in the receiving cavity 13, and improving the energy density of the battery cell 102. For example, if the part where the tab 33 connects to the second conductive segment 416 (such as the folding part 313 described herein) is elongated, the second conductive segment 416 can also be elongated, while the first conductive segment 415 can be set as a circle that matches the electrode body 21, which can meet the connection requirements. In addition, when the conductive element 41 includes the first conductive segment 415 and the second conductive segment 416, in order to ensure that the second conductive segment 416 protrudes relative to the first conductive segment 415 in the direction away from the electrode component 3, the conductive element 41 can be processed from a material with a certain hardness and thickness, for example, the conductive element 41 can be a metal sheet.

[0232] For example, referring to FIG14, regardless of whether the adapter structure 22 protrudes relative to the first shell wall 111 in a direction away from the electrode component 3, the position of the inner end face 220 of the adapter structure 22 adjacent to the electrode body 21 is a surrounding region 2201 surrounding the electrode body 21. The surrounding region 2201 protrudes from the inner end face 211 of the electrode body 21 in a direction towards the electrode component 3. The inner end face 220 of the adapter structure 22 can be a planar structure or a non-planar structure, such as a protruding shape. The outermost ring of the inner end face 220 of the adapter structure 22 facing the electrode body 21 is the surrounding region 2201.

[0233] For example, referring to FIG16, when the inner end face 211 of the electrode body 21 is set to be large (for example, the transition structure 22 is formed as an elongated strip extending along the length direction of the first shell wall 111, and the outline shape of the electrode body 21 matches the outline shape of the transition structure 22), and when the surrounding area 2201 protrudes from the inner end face 211 of the electrode body 21 in the direction toward the electrode component 3, the electrode connection portion of the conductive part 4 (for example, the folding portion 313 of the electrode tab portion 33 described herein, or the second connecting segment 412 of the conductive member 41) can be completely laid flat on the inner end face 211 of the electrode body 21.

[0234] For example, referring to FIG14, when the inner end face 211 of the electrode body 21 is small (for example, the adapter structure 22 is configured as an elongated strip extending along the length direction of the first shell wall 111, and the electrode body 21 is located in the center of the adapter structure 22 with a circular outline), and when the surrounding area 2201 protrudes from the inner end face 211 of the electrode body 21 in the direction toward the electrode component 3, the conductive element 41 can be configured to include a first conductive segment 415 laid on the inner end face 211 of the electrode body 21, and a third conductive segment 417 offset from the inner end face 211 of the electrode body 21. The third conductive segment 417 protrudes relative to the first conductive segment 415 in the direction toward the electrode component 3, and the tab 33 is connected to the third conductive segment 417. Thus, the adapter 41 can satisfy both the connection requirements with the inner end face 211 of the electrode body 21 and the connection requirements with the tab 33. Furthermore, when the conductive element 41 includes a first conductive segment 415 and a third conductive segment 417, in order to ensure that the third conductive segment 417 protrudes relative to the first conductive segment 415 towards the electrode component 3, a material with a certain hardness and thickness can be selected to process the conductive element 41. For example, the conductive element 41 can be a metal sheet. For example, if the portion where the electrode tab 33 connects to the third conductive segment 417 (such as the retracted portion 313 described herein) is elongated, the third conductive segment 417 can also be set to be elongated, while the first conductive segment 415 can be set to a shape that matches the mating region 211a (e.g., circular), which can satisfy the connection requirements.

[0235] Please refer to Figures 23A-23D, which are exploded views of the manufacturing process of a battery cell according to one embodiment of this application. In some embodiments of this application, the terminal component 2 includes a terminal body 21, which includes a first terminal member 21a and a second terminal member 21b. The second terminal member 21b is mounted on the first shell wall 111 and defines a mating hole 21b1. The first terminal member 21a is mounted on the side of the second terminal member 21b away from the electrode component 3 and covers the mating hole 21b1. The electrode component 3 is connected to the first terminal member 21a through a conductive part 4 extending into the mating hole 21b1.

[0236] Therefore, during assembly, the first electrode post 21a can be connected to the conductive part 4 first, and the second electrode post 21b can be connected to the first shell wall 111 first, and then the first electrode post 21a and the second electrode post 21b can be connected. This also enables the installation of the electrode post 2 and the electrode part 3 onto the shell 11, which helps to shorten the electrode tab 33.

[0237] Referring again to Figures 23A-23D, exemplarily, the first shell wall 111 has mounting holes 112, and the second pole piece 21b passes through the mounting holes 112 and is clamped on the inner and outer sides of the first shell wall 111. An insulating sealing component 24 is provided between the second pole piece 21b and the first shell wall 111. Therefore, the connection between the second pole piece 21b and the first shell wall 111 is relatively reliable, and by providing the insulating sealing component 24, the connection between the second pole piece 21b and the first shell wall 111 is both insulated and sealed. The second pole piece 21b can be made of metal, which helps to increase the conductive area of ​​the pole body 21. Exemplarily, the second pole piece 21b can be riveted to the first shell wall 111, thereby eliminating the welding process, improving processing efficiency, and avoiding the impact of welding heat on the insulating sealing component 24. The composition of the insulating sealing component 24 is not limited; for example, it can be a single part or composed of multiple parts, such as elastic rubber parts, plastic parts, etc.

[0238] In other embodiments of this application, the second pole piece 21b may be configured as a multi-part welded assembly, or the second pole piece 21b may be made of a non-metallic material and connected to the first shell wall 111 by means of bonding, injection molding, etc.

[0239] Please refer again to Figures 5 and 7. In some embodiments of this application, the surface of the electrode body 21 facing the electrode component 3 (i.e., the surface facing the active material coating portion 32) is the inner end face 211 of the electrode body 21. The electrode component 3 is connected to the inner end face 211 of the electrode body 21 via a conductive portion 4 (e.g., tab 33 or conductive element 41). This reduces the difficulty of assembling and connecting the conductive portion 4 to the electrode body 21, improves processing efficiency, and, compared to connecting to other parts of the electrode body 21, shortens the length of the conductive portion 4, saving materials and costs.

[0240] Please refer again to Figures 5 and 7. In some embodiments of this application, the conductive portion 4 (e.g., the tab portion 33 or the conductive element 41) is partially laid on the inner end face 211 of the pole body 21. By partially laying the conductive portion 4 on the inner end face 211 of the pole body 21, the portion of the conductive portion 4 is laid flat, and its projection falls on the inner end face 211 of the pole body 21. This improves the reliability of the connection between the conductive portion 4 and the pole body 21, increases the connection area between the conductive portion 4 and the pole body 21, and enhances conductivity.

[0241] For example, the conductive part 4 may include a pole connection part, at least part of which is laid on the inner end face 211 of the pole body 21. The pole connection part may be a relatively rigid plate shape, such as one that will not bend or deform downward under the action of gravity, such as the folding part 313 of the tab 33 described herein (e.g., ultrasonic welding), or the second connecting section 412 (e.g., metal sheet) or the first conductive section 415 (e.g., metal sheet) of the conductive member 41.

[0242] Referring again to Figures 18-19, exemplarily, when the battery cell 102 is in an assembled state (e.g., as shown in Figure 19), the inner end face 211 of the electrode post body 21 is parallel to the axial section 34 of the electrode component 3. The axial section 34 of the electrode component 3 is perpendicular to the tab direction of the electrode component 3. The tab direction of the electrode component 3 is the direction in which the active material coating portion 32 extends out of the tab portion 33 (e.g., the fifth direction F5 shown in Figure 19), which is perpendicular to the first shell wall 111. This facilitates the processing and design of the electrode post body 21.

[0243] Please refer to Figures 24A-24B, which are exploded views of the processing of a battery cell according to an embodiment of this application. Exemplarily, when the battery cell 102 is in an assembled state (e.g., as shown in Figure 24B), the inner end face 211 of the electrode post body 21 is inclined relative to the axial section 34 of the electrode component 3. The axial section 34 of the electrode component 3 is perpendicular to the tab direction of the electrode component 3. The tab direction of the electrode component 3 is the direction in which the active material coating portion 32 extends out of the tab portion 33 (e.g., the fifth direction F5 shown in Figure 24B), and this direction is perpendicular to the first shell wall 111.

[0244] Thus, before partially laying the conductive part 4 on the inner end face 211 of the electrode body 21, the electrode component 2 can be adjusted so that the inner end face 211 of the electrode body 21 is parallel to the electrode tab direction of the electrode component 3 (for example, as shown in Figure 24A). This facilitates the partial laying of the conductive part 4 on the inner end face 211 of the electrode body 21, providing a larger welding operation space. Moreover, at this time, the outer end face 213 of the electrode body 21 (i.e., the surface away from the electrode component 3) is inclined to the electrode tab direction of the electrode component 3. In the direction (e.g., the fifth direction F5 shown in Figure 24A), after the conductive part 4 is connected to the electrode body 21, the electrode component 2 can be rotated less than 90° as a whole, which satisfies the requirement that the electrode body 21 is covered by the first shell wall 111, and the outer end face 213 of the electrode body 21 is parallel to the first shell wall 111. Thus, the inner end face 211 of the electrode body 21 is parallel to the axial section 34 of the electrode component 3. This reduces the rotation angle during the assembly of the electrode component 2 and helps to shorten the length of the conductive part 4.

[0245] Figures 25A-25C are exploded views of the manufacturing process of an electrode component according to an embodiment of this application. Referring to Figures 25A-25B, in some embodiments of this application, the electrode tab 33 of the electrode component 3 includes a stacked portion 312 formed by stacking and aggregating multiple layers of electrode tabs 311. Exemplarily, the electrode component 3 includes one or more electrode assemblies 31, each electrode assembly 31 having a positive electrode tab 311 and a negative electrode tab 311. Stacking and aggregating multiple layers of electrode tabs 311 of the same polarity to form the stacked portion 312 facilitates the pre-processing of the electrode tab 33 or its connection with other components.

[0246] For example, the multiple layers of tabs 311 in the stacked portion 312 may belong to the same electrode assembly 31 or to different electrode assemblies 31. That is, several layers of tabs 311 of the same polarity in the same electrode assembly 31 can be gathered to form the stacked portion 312, or several layers of tabs 311 of the same polarity in different electrode assemblies 31 can be gathered to form the stacked portion 312. For example, all the tabs 311 of the same polarity in the electrode component 3 can be gathered to form the stacked portion 312, which can reduce the number of stacked portions 312.

[0247] For example, referring to Figures 25B-25C, the multi-layered tabs 311 in the stacked portion 312 are connected to form a gathered portion 313. That is, the tab portion 33 includes a gathered portion 313 formed by stacking and connecting multiple layers of tabs 311. Thus, by connecting the multi-layered tabs 311 in the stacked portion 312 to form the gathered portion 313, the multi-layered tabs 311 in the gathered portion 313 are electrically conductive. In other words, the multi-layered tabs 311 in the gathered portion 313 not only exhibit a stacked arrangement but also have a connected and conductive relationship. The connection method of the multi-layered tabs 311 in the gathered portion 313 is not limited; for example, it can be welding (such as ultrasonic welding, ultrasonic pre-welding and laser welding, resistance welding, pressure welding, or brazing, etc.), or through-hole connection, or bonding with conductive adhesive, etc. For example, multi-layered tabs 311 of the same polarity can be ultrasonically welded, and the resulting ultrasonic weld mark is the gathered portion 313.

[0248] For example, the multiple layers of tabs 311 in the gathering portion 313 may belong to the same electrode assembly 31 or to different electrode assemblies 31. That is, several layers of tabs 311 of the same polarity in the same electrode assembly 31 can be connected to form the gathering portion 313, or several layers of tabs 311 of the same polarity in different electrode assemblies 31 can be connected to form the gathering portion 313. For example, all the tabs 311 of the same polarity in the electrode component 3 can be connected to form the gathering portion 313, which can reduce the number of gathering portions 313.

[0249] In the above technical solution, by pre-connecting multiple layers of tabs 311 in the tab portion 33 to form a gathering portion 313, the gathering portion 313 can present a plate shape with multiple layers of tabs 311 connected together and having a certain rigidity, rather than a loose and scattered multi-layer foil shape. This facilitates the assembly and connection operations of the tab portion 33 with other components, such as perforation and welding operations. This makes it less likely for pores to form in the weld seam formed by the tab portion 33 and other components, which can improve the connection reliability and conductivity of the weld, and make the conductivity between the electrode component 3 and the pole component 2 more stable and reliable.

[0250] Please refer again to Figure 7. In some embodiments of this application, the electrode component 2 includes an electrode body 21, and the electrode component 3 includes an active material coating portion 32 housed in the receiving cavity 13, and an electrode tab portion 33 connected to the active material coating portion 32. The electrode tab portion 33 extends to and connects to the electrode body 21. Therefore, the conductive portion 4 may only include the electrode tab portion 33, and the electrode tab portion 33 is directly connected to the electrode body 21, thereby eliminating the need for the conductive component 41 and the connection step between the conductive component 41 and the electrode tab portion 33. Furthermore, by pre-connecting multiple layers of tabs 311 in the tab portion 33 to form a gathered portion 313, the gathered portion 313 can present a plate shape with multiple layers of tabs 311 connected together and having a certain rigidity, rather than a loose and scattered multi-layer foil shape. This facilitates the connection between the tab portion 33 and the electrode post body 21, making the welding of the tab portion 33 and the electrode post body 21 more reliable. It is less likely to form pores in the weld, which can improve the connection reliability and conductivity of the weld, making the conductivity between the electrode component 3 and the electrode post component 2 more stable and reliable.

[0251] Referring again to Figures 7 and 12, exemplarily, the surface of the electrode body 21 facing the electrode component 3 is the inner end face 211 of the electrode body 21. The tab 33 includes a gathered portion 313 formed by stacking and connecting multiple layers of tabs 311. At least a portion of the gathered portion 313 is laid on and connected to the inner end face 211 of the electrode body 21. Thus, by laying at least a portion of the gathered portion 313 on the inner end face 211 of the electrode body 21, the gathered portion 313 is laid flat and flat. At least a portion of the gathered portion 313 rests on the inner end face 211 of the electrode body 21, thereby preventing damage to the tab 33 due to bending of the gathered portion 313, improving conductivity, and facilitating the clamping of the welding nozzle to tighten the gathered portion 313, thus improving the connection reliability between the gathered portion 313 and the electrode body 21. Furthermore, by laying at least a portion of the gathering portion 313 on the inner end face 211 of the pole body 21 and connecting it to the inner end face 211 of the pole body 21, it is beneficial to increase the connection area, connection reliability and current carrying capacity between the tab portion 33 and the pole body 21.

[0252] Please refer again to Figure 7. In some embodiments of this application, the entire closing portion 313 is laid on the inner end face 211 of the pole body 21. That is, the area of ​​the inner end face 211 of the pole body 21 is greater than or equal to the area of ​​the closing portion 313, so that the closing portion 313 can completely fall on the inner end face 211 of the pole body 21. This helps to increase the connection area between the inner end face 211 of the pole body 21 and the closing portion 313, thereby improving the current carrying efficiency.

[0253] In some embodiments of this application, please refer again to FIG5. The electrode component 2 includes an electrode body 21, and the electrode component 3 includes an active material coating portion 32 housed in the receiving cavity 13, and an electrode tab portion 33 connected to the active material coating portion 32. The electrode tab portion 33 is connected to the electrode body 21 via a conductive element 41. Thus, by indirectly connecting the electrode tab portion 33 and the electrode body 21 through the conductive element 41, the length of the electrode tab portion 33 can be shortened, and problems such as wrinkling, bending, and breakage of the electrode tab 311 can be improved. Furthermore, by flexibly designing the shape and material of the conductive element 41, the connection difficulty with the electrode body 21 can be reduced, and the connection convenience between the conductive element 41 and the electrode body 21 can be improved. In addition, the perforation operation of the conductive portion 4, the connection operation between the conductive portion 4 and the electrode component 2 (which may be omitted), and the connection operation between the electrode component 2 and the housing component 1 are less likely to cause cracking at the connection position between the active material coating portion 32 and the electrode tab 33, thereby improving the reliability of the battery cell 102.

[0254] For example, the laminated portion 312 can be connected to the conductive element 41, thereby eliminating the step of connecting the laminated portion 312 to form the closing portion 313. Alternatively, for example, the multilayer tabs 311 in the laminated portion 312 can be connected to form the closing portion 313 before connecting the closing portion 313 to the conductive element 41, thereby allowing for flexible and diverse design of the structural form of the conductive element 41.

[0255] For example, the conductive element 41 can be connected to the inner end face 211 of the electrode body 21, thereby shortening the length of the conductive element 41. For instance, the conductive element 41 may include a second connecting segment 412, which can be laid on and connected to the inner end face 211 of the electrode body 21, thereby improving the connection reliability and conductivity between the conductive element 41 and the electrode body 21. Alternatively, for example, the conductive element 41 can also be connected to other locations on the electrode body 21, such as pre-embedding the conductive element 41 in the electrode body 21 or passing through the electrode body 21 for connection.

[0256] Figures 26A-26D are exploded views of the manufacturing process of a battery cell according to an embodiment of this application. In some embodiments of this application, referring to Figures 26A-26D, the conductive element 41 includes a first connecting segment 411, the first connecting segment 411 includes two clamping portions 4110, and the tab portion 33 includes a tab end 331, which is clamped between the two clamping portions 4110 and connected to the clamping portions 4110. The tab end 331 can be a stacked portion 312 or a gathered portion 313. Thus, the two clamping portions 4110 can be used to limit the tab end 331, improving the connection reliability of the multi-layer tab pieces 311 in the tab end 331. In addition, in some examples, by providing two clamping parts 4110, the tab end 331 clamped between the two clamping parts 4110 can be in the state of a stacked part 312, which can eliminate the step of connecting the multiple layers of tabs 311 in the stacked part 312 to form a gathering part 313, thereby simplifying the processing procedure and improving processing efficiency.

[0257] Referring to Figures 26A-26D, exemplarily, the conductive element 41 includes a second connecting segment 412, which is laid on and connected to the inner end face 211 of the electrode body 21. The conductive element 41 is bent at the connection point between the first connecting segment 411 and the second connecting segment 412, so that the first connecting segment 411 is located on the side of the second connecting segment 412 away from the electrode body 21. A clamping portion 4110 supports the tab end 331 on the side away from the electrode body 21 (for example, as shown in Figure 26D). Thus, by supporting the tab portion 33 with the clamping portion 4110, the redundancy of the tab portion 33 can be improved, reducing the risk of short circuit caused by the tab portion 33 being inserted into the active material coating portion 32. Moreover, the bent conductive element 41 can act as a buffer support, reducing the risk of the electrode component 3 impacting the housing component 1 and improving the reliability of the battery cell 102.

[0258] In addition, to facilitate bending, the conductive element 41 can be made in a way that reduces the material at the connection position between the first connecting segment 411 and the second connecting segment 412, for example, by reducing the width or the thickness. In this way, the first connecting segment 411 and the second connecting segment 412 can each have a certain rigidity, which facilitates the connection between the first connecting segment 411 and the electrode tab 33, and the connection between the second connecting segment 412 and the electrode body 21. At the same time, it also facilitates the bending of the conductive element 41 at the connection position between the first connecting segment 411 and the second connecting segment 412.

[0259] Figures 27A-27C are exploded views of the processing of a battery cell according to one embodiment of this application. In some embodiments of this application, referring to Figures 27A-27C, the tab portion 33 includes a gathered portion 313 formed by stacking and connecting multiple layers of tab sheets 311. The conductive element 41 includes a first connecting segment 411. The gathered portion 313 is stacked on one side of the first connecting segment 411 in the thickness direction and connected to the first connecting segment 411. The first connecting segment 411 is in plate form, and its thickness direction is consistent with that of the gathered portion 313. The two are stacked along the thickness direction of the first connecting segment 411, thus simplifying the connection between the gathered portion 313 and the conductive element 41 and improving production efficiency.

[0260] Referring again to Figure 27C, exemplarily, the first connecting segment 411 supports the retractable portion 313 on the side opposite to the electrode body 21, so that the retractable portion 313 is sandwiched between the inner end face 211 of the electrode body 21 and the first connecting segment 411. Thus, by supporting the retractable portion 313 with the first connecting segment 411, the redundancy of the tab portion 33 can be improved, reducing the risk of short circuit caused by the tab portion 33 being inserted backwards into the active material coating portion 32.

[0261] In some embodiments of this application, please refer again to FIG5. The electrode component 2 includes an electrode body 21, and the electrode component 3 includes an active material coating portion 32 housed in the receiving cavity 13. The active material coating portion 32 is connected to the electrode body 21 through a conductive portion 4. The conductive portion 4 is bent to form at least two opening slots 42, wherein the openings of the two opening slots 42 have different orientations and are adjacent in the direction from the electrode body 21 to the active material coating portion 32 (for example, as shown in FIG5, one of the two adjacent opening slots 42 faces left and the other faces right). Thus, the conductive portion 4 can present a serpentine shape with reciprocating bending. The conductive portion 4 can play a buffering role. When the battery cell 102 is used in a vibration environment, it can reduce the impact of the active material coating portion 32 toward the first shell wall 111, thereby protecting the electrode component 3 and improving the reliability of the battery cell 102. Furthermore, since the conductive portion 4 does not extend irregularly, the mutual interference and scratching between the tabs 311 in the conductive portion 4 can be reduced, as well as the risk of the tabs 311 being inserted backwards into the active material coating portion 32, thereby further improving the reliability of the battery cell 102.

[0262] For example, referring again to FIG5, when the conductive part 4 includes a tab 33 and a conductive member 41 connected to the tab 33, and the tab 33 is connected to the pole body 21 via the conductive member 41, the conductive member 41 and the tab 33 are bent together to form two adjacent opening slots 42 with opposite opening orientations. For example, one opening slot 42 is defined between the first connecting segment 411 and the second connecting segment 412, and the first connecting segment 411 and the tab 33 define another opening slot 42. Thus, the conductive part 4 can present a reciprocating S-shape, thereby shortening the length of the conductive part 4, simplifying the structure of the conductive part 4, and facilitating the processing of the conductive part 4. Alternatively, for example, referring to FIG16, when the tab 33 constitutes the conductive part 4 to extend to and connect to the pole body 21, and the tab 33 is bent alone to form two adjacent opening slots 42 with opposite opening orientations, the tab 33 is bent alone to form two adjacent opening slots 42 with opposite opening orientations.

[0263] In some embodiments of this application, referring again to FIG3, the battery cell 102 further includes a pressure relief device 6, which is disposed on the housing component 1. Exemplarily, the pressure relief device 6 may be an explosion-proof valve installed on the housing component 1, or it may be integrally formed on a thinned area of ​​the housing component 1. Thus, by providing the pressure relief device 6, when the pressure inside the housing component 1 exceeds a preset value, the pressure can be directionally released through the pressure relief device 6, thereby improving the safety and reliability of the battery cell 102.

[0264] For example, referring to Figure 3, the pressure relief device 6 and the terminal post component 2 are located on the same side. Since the terminal post component 2 is located on the first housing wall 111, when the pressure relief device 6 is also located on the first housing wall 111, the pressure relief device 6 and the terminal post component 2 are located on the same side. As a result, the design of the other housing walls besides the first housing wall 111 can be simplified, and the structure and processing of the battery cell 102 can be simplified.

[0265] For example, the pressure relief device 6 and the pole member 2 are located on opposite sides. Since the pole member 2 is located on the first shell wall 111, when the pressure relief device 6 is also located on another wall of the shell member 1 other than the first shell wall 111, for example, the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, and the pressure relief device 6 is located on the second shell wall 114, or the pressure relief device 6 is located on the shell cover 12, then the pressure relief device 6 and the pole member 2 are located on opposite sides. Therefore, there is no need to consider reducing the volume of the pole member 2 by occupying the space of the first shell wall 111, so that the shape and area of ​​the pole member 2 can be flexibly designed as needed.

[0266] For example, referring to Figure 6, the pressure relief device 6 and the pole member 2 are located on opposite sides. Since the pole member 2 is located on the first shell wall 111, when the pressure relief device 6 is located on a wall of the shell member 1 other than the first shell wall 111, for example, the end of the shell body 11 opposite to the opening 113 is the first shell wall 111, and the pressure relief device 6 is located on the second shell wall 114, or the pressure relief device 6 is located on the shell cover 12, then the pressure relief device 6 and the pole member 2 are located on opposite sides. Therefore, there is no need to consider reducing the volume of the pole member 2 by occupying the space of the first shell wall 111, so that the shape and area of ​​the pole member 2 can be flexibly designed as needed.

[0267] The housing component 1 can be surrounded by multiple non-coplanar walls. For example, the rectangular housing component 1 is surrounded by six walls, one of which is the first housing wall 111. The pressure relief device 6 is placed on any other wall other than the first housing wall 111, and the pole component 2 is placed on the first housing wall 111, so that the two are located on opposite sides.

[0268] According to a second aspect of this application, this application also provides a battery 100, including a battery cell 102 of any of the above-described embodiments. It is worth noting that the battery 100 according to this application embodiment may or may not include a casing 101. Therefore, since the reliability of the battery cell 102 according to this application embodiment is improved, it is beneficial to improve the performance of the battery 100.

[0269] For example, the battery 100 may further include a busbar, and multiple battery cells 102, at least two of which 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.

[0270] For example, referring to FIG2, the battery 100 includes a housing 101, and multiple battery cells 102 are housed in the housing 101. The bottom of the housing 101 is a housing bottom plate 1013. The terminal post 2 is disposed on the side of the housing component 1 facing the housing bottom plate 1013, or on the side of the housing component 1 away from the housing bottom plate 1013.

[0271] During the use of the battery 100, such as in vehicle use, the bottom plate 1013 of the casing is located at the bottom of the casing 101 in the direction of gravity. Therefore, when the terminal post 2 is located on the side of the housing component 1 facing the bottom plate 1013, it means that the terminal post 2 is located at the bottom of the housing component 1 in the direction of gravity; and when the terminal post 2 is located on the side of the housing component 1 away from the bottom plate 1013, it means that the terminal post 2 is located at the top of the housing component 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 casing 101.

[0272] Specifically, when the terminal post 2 of the battery cell 102 is located on the side of the housing component 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 post 2 of the battery cell 102 is located on the side of the housing component 1 close to the bottom plate 1013 of the box, the battery cell 102 is in an upright state, and the electrolyte is not easy to leak.

[0273] According to a third aspect of this application, this application also provides an electrical device including a battery 100 of any of the above-described embodiments, the battery 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 100. Because the performance of the battery 100 is improved, it is beneficial to improve the power consumption performance of the electrical device.

[0274] Below, some specific embodiments according to this application are described.

[0275] Example 1

[0276] Referring to Figures 28A-28D, the housing component 1 has a receiving cavity 13 and includes a shell body 11 that forms the receiving cavity 13. One end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a first shell wall 111. The first shell wall 111 has a mounting hole 112. The electrode component 2 is mounted on the first shell wall 111 and covers the mounting hole 112. The electrode component 3 includes a plurality of stacked electrode assemblies 31 to have an active material coating portion 32 received in the receiving cavity 13, and an electrode tab 33 connected to the active material coating portion 32. The electrode tab 33 is connected to the electrode component 2. The electrode component 2 includes an electrode body 21, a transition structure 22, and an insulating structure 23. The transition structure 22 surrounds the electrode body 21, and the insulating structure 23 is insulatingly fitted between the electrode body 21 and the transition structure 22. The transition structure 22 is connected to the first shell wall 111, and the electrode body 21 is connected to the electrode tab 33.

[0277] Referring to Figures 28A-28D, during the processing of the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure). Multiple electrode assemblies 31 are stacked and connected with the same polarity of the multilayer tabs 311 to form a gathering portion 313. Then, the gathering portion 313 is connected to the electrode post body 21. The electrode component 3 is installed into the housing 11 with the tabs 33 facing the active material coating portion 32 toward the mounting hole 112. As the electrode component 3 is installed into the housing 11, the gathering portion 313 passes through to the outside of the mounting hole 112. The gathering portion 313 is connected to the electrode post component 2 placed on the outside of the first housing wall 111. Then, the electrode post component 2 with the gathering portion 313 is covered by the mounting hole 112 from the outside of the first housing wall 111. Finally, the adapter structure 22 is welded and fixed to the first housing wall 111.

[0278] The welding position of the electrode component 2 and the retractable part 313 is located outside the housing 11, which can improve the problem of conductive debris formed during the welding process entering the housing 11 and causing damage to the electrode component 3.

[0279] Example 2

[0280] Referring to Figures 29A-29D, the housing component 1 has a receiving cavity 13 and includes a shell body 11 that forms the receiving cavity 13. One end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a first shell wall 111. The first shell wall 111 has a mounting hole 112. The electrode component 2 is mounted on the first shell wall 111 and covers the mounting hole 112. The electrode component 3 includes a plurality of stacked electrode assemblies 31 to have an active material coating portion 32 received in the receiving cavity 13, and an electrode tab 33 connected to the active material coating portion 32. The electrode tab 33 is connected to the electrode component 2. The electrode component 2 includes an electrode body 21, a connecting structure 22, and an insulating structure 23. The connecting structure 22 surrounds the electrode body 21, and the insulating structure 23 is insulatingly fitted between the electrode body 21 and the connecting structure 22. The connecting structure 22 is connected to the first shell wall 111, and the electrode body 21 is connected to the electrode tab 33.

[0281] Referring to Figures 29A-29D, during the processing of the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure). The multiple electrode assemblies 31 are stacked and connected with multilayer tabs 311 of the same polarity to form a gathering part 313. Then, the gathering part 313 is connected to the electrode post body 21. The electrode assembly 3 and the electrode post assembly 2 connected to the gathering part 313 are installed into the housing 11 according to the direction of the electrode post assembly 2 relative to the active material coating part 32 toward the mounting hole 112. As the electrode assembly 3 is installed into the housing 11, the electrode post assembly 2 passes through the mounting hole 112 to the outside of the first housing wall 111. Then, the electrode post assembly 2 connected to the gathering part 313 covers the mounting hole 112 from the outside of the first housing wall 111. Finally, the adapter structure 22 is welded and fixed to the first housing wall 111.

[0282] When the electrode component 2 is welded to the retractable part 313, it is not yet installed in the housing 11, which can improve the problem of conductive debris formed during the welding process entering the housing 11 and causing damage to the electrode component 3.

[0283] Example 3

[0284] Referring to Figures 30A-30D, the housing component 1 has a receiving cavity 13 and includes a shell body 11 that forms the receiving cavity 13. One end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a first shell wall 111. The first shell wall 111 has a mounting hole 112. The electrode component 2 is mounted on the first shell wall 111 and covers the mounting hole 112. The electrode component 3 includes a plurality of stacked electrode assemblies 31 to have an active material coating portion 32 received in the receiving cavity 13, and an electrode tab 33 connected to the active material coating portion 32. The electrode tab 33 is connected to the electrode component 2. The electrode component 2 includes an electrode body 21, a transition structure 22, and an insulating structure 23. The transition structure 22 surrounds the electrode body 21, and the insulating structure 23 is insulatingly fitted between the electrode body 21 and the transition structure 22. The transition structure 22 is connected to the first shell wall 111, and the electrode body 21 is connected to the electrode tab 33.

[0285] Referring to Figures 30A-30D, when processing the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure). The multiple electrode assemblies 31 are stacked and connected with multilayer tabs 311 of the same polarity to form a gathering part 313. Then, the gathering part 313 is connected to the electrode post body 21. The electrode assembly 3 and the electrode post assembly 2 connected to the gathering part 313 are installed into the housing 11 according to the direction of the electrode post component 2 relative to the active material coating part 32 toward the mounting hole 112. Then, the mounting hole 112 is covered by the electrode post component 2 from the inside of the first housing wall 111. After that, the adapter structure 22 is welded and fixed to the first housing wall 111.

[0286] When the electrode component 2 is welded to the retractable part 313, it is not yet installed in the housing 11, which can improve the problem of conductive debris formed during the welding process entering the housing 11 and causing damage to the electrode component 3.

[0287] Example 4

[0288] Referring to Figures 31A-31E, the housing component 1 has a receiving cavity 13 and includes a shell body 11 that forms the receiving cavity 13. One end of the shell body 11 has an opening 113, and the end of the shell body 11 opposite to the opening 113 is a first shell wall 111. The first shell wall 111 has a mounting hole 112. The electrode component 2 is mounted on the first shell wall 111 and seals the mounting hole 112. The electrode component 3 includes a plurality of stacked electrode assemblies 31 to have an active material coating portion 32 received in the receiving cavity 13, and an electrode tab 33 connected to the active material coating portion 32. The electrode tab 33 is connected to the electrode component 2. The electrode component 2 includes an electrode body 21 and an insulating sealing component 24. The electrode body 21 includes a first electrode member 21a and a second electrode member 21b. The second electrode member 21b defines a mating hole 21b1. The first electrode member 21a is located on the side of the second electrode member 21b away from the electrode component 3 and covers the mating hole 21b1. The second electrode member 21b is connected to the first shell wall 111, and the first electrode member 21a is connected to the electrode tab 33.

[0289] Referring to Figures 31A-31E, during the processing of the battery cell 102, multiple electrode assemblies 31 are stacked along the thickness direction of the electrode assembly 31 (e.g., the fourth direction F4 shown in the figure). Multiple electrode assemblies 31 are stacked and connected with multilayer tabs 311 of the same polarity to form a converged portion 313. Then, the converged portion 313 is connected to the first electrode post 21a, and the second electrode post 21b is riveted to the first housing wall 111. An insulating sealing component 24 is held between the second electrode post 21b and the first housing wall 111. Subsequently, the electrode component 3 and the first electrode component 21a connected to the gathering part 313 can be installed into the housing 11 with the first electrode component 21a facing the active material coating part 32 toward the mounting hole 112. As the electrode component 3 is installed into the housing 11, the first electrode component 21a extends from the mating hole 21b1 to the outside of the first housing wall 111. Then, the first electrode component 21a connected to the gathering part 313 covers the mating hole 21b1 from the outside of the first housing wall 111. After that, the first electrode component 21a and the second electrode component 21b are welded and fixed.

[0290] When the retractable part 313 is welded to the first electrode post 21a, it has not yet been installed in the housing 11, which can improve the problem of conductive debris formed during the welding process entering the housing 11 and causing damage to the electrode component 3.

[0291] Example 5

[0292] Referring to Figures 23A-23D, the difference between Embodiment 5 and Embodiment 4 is that: after passing the gathering part 313 through the mating hole 21b1, the gathering part 313 and the first pole piece 21a are welded together. This will not be elaborated here.

[0293] It is worth noting that the above embodiments one to five are intended to illustrate the processing sequence of the battery cell 102, but the specific configuration of the electrode cell 102 is not limited. For example, in the above embodiments one to five, the tab 33 and the terminal component 2 can be directly connected, or they can be connected through the conductive component 41 of the present application. For another example, in the above embodiments one to three, the form of the adapter structure 22 of the terminal component 2, the form of the insulation structure 23, and the shape of the terminal body 21 are not limited. All can be referred to any of the above embodiments of the present application, and will not be elaborated here.

[0294] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0295] 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, wherein, The application relates to a shell component, a pole column component and an electrode component. The shell component has a containing cavity and comprises a shell body participating in forming the containing cavity, the shell body is an integral piece and has an opening at one end, and the end of the shell body opposite to the opening is a first shell wall; The pole column component is installed on the first shell wall; The electrode component is accommodated in the containing cavity and connected with the pole column component.

2. The battery cell according to claim 1, wherein, The pole column component comprises a pole column body, an adapter structure and an insulation structure, the adapter structure surrounds the pole column body and is connected with the first shell wall, and the insulation structure is sealingly fitted between the adapter structure and the pole column body, and the electrode component is connected with the pole column body.

3. The battery cell of claim 2, wherein, The adapter structure is formed in a long strip shape extending along the length direction of the first shell wall, and the contour shape of the pole column body matches that of the adapter structure. Alternatively, the adapter structure is formed in a long strip shape extending along the length direction of the first shell wall, and the pole column body is arranged at the length center position of the adapter structure and is circular.

4. The battery cell of claim 2 or 3, wherein, The insulation structure is sealingly fitted between the adapter structure and the pole column body.

5. The battery cell of claim 4, wherein, The insulation structure comprises a sealing structure ring arranged on the circumferential side of the adapter structure facing the pole column body and clamped between the adapter structure and the pole column body at least in the inside-outside direction of the first shell wall.

6. The battery cell of claim 5, wherein, The pole column body comprises a peripheral portion, the adapter structure is clamped on both sides of the peripheral portion in the inside-outside direction of the first shell wall through the insulation structure, and at least part of the sealing structure is clamped between one side of the peripheral portion facing the electrode component and the adapter structure.

7. The battery cell of claim 5, wherein, The adapter structure comprises a fitting ring portion, the pole column body comprises a penetrating portion penetrating the fitting ring portion, and an inner limiting portion and an outer limiting portion connected with the penetrating portion and clamped on both sides of the fitting ring portion in the inside-outside direction, and at least part of the sealing structure is clamped between the fitting ring portion and the inner limiting portion.

8. The battery cell of claim 2, wherein, The first shell wall has a mounting hole, a sealing ring is arranged around the mounting hole, and the sealing ring is clamped between the pole column component and the first shell wall.

9. The battery cell of any one of claims 2-8, wherein, The first shell wall has a mounting hole, the pole column component is arranged on the mounting hole, and the edge of the adapter structure is overlapped on one side of the first shell wall in the wall thickness direction.

10. The battery cell of claim 9, wherein, The edge of the adapter structure is overlapped on one side of the first shell wall away from the electrode component, the first shell wall has a first sunken groove arranged around the mounting hole and open in the direction away from the electrode component, and the edge of the adapter structure has a flange portion embedded in the first sunken groove.

11. The battery cell of claim 9 or 10, wherein, The edge of the adapter structure is overlapped on one side of the first shell wall away from the electrode component, the mounting hole is a long strip hole, and the pole column component is formed in a long strip structure matching the shape of the mounting hole.

12. The battery cell of claim 9, wherein, The edge of the adapter structure is overlapped on one side of the first shell wall facing the electrode component, the edge of the adapter structure has a second sunken groove open in the direction away from the electrode component, the first shell wall comprises an overlapping portion protruding into the mounting hole, and the overlapping portion is embedded in the second sunken groove.

13. The battery cell of any one of claims 9-12, wherein, The adapter structure is welded to the first shell wall.

14. The battery cell of claim 13, wherein, The weld formed by welding the adapter structure to the first shell wall is exposed to the side of the first shell wall facing away from the electrode assembly.

15. The battery cell of any one of claims 2-14, wherein, The pole post assembly includes a pole post body, the pole post body includes a first pole post member and a second pole post member, the second pole post member is mounted to the first shell wall and defines a fitting hole, the first pole post member is mounted to the side of the second pole post member facing away from the electrode assembly and covers the fitting hole, and the electrode assembly is connected to the first pole post member through a conductive part extending into the fitting hole.

16. The battery cell of claim 15, wherein, The fitting hole is formed on the side of the pole post body and the adapter structure facing the electrode assembly, and the adapter structure is raised relative to the first shell wall in a direction facing away from the electrode assembly so that the fitting hole is recessed relative to the first shell wall in a direction facing away from the electrode assembly.

17. The battery cell of claim 15 or 16, wherein, The surface of the end of the pole post body facing the electrode assembly is an inner end surface of the pole post body, the inner end surface of the pole post body participates in forming the fitting hole, and the conductive part is connected to the inner end surface of the pole post body.

18. The battery cell of claim 17, wherein, The position of the inner end surface of the adapter structure adjacent to the pole post body is a surrounding area surrounding the pole post body, the surrounding area is flush with the inner end surface of the pole post body, or the inner end surface of the pole post body protrudes in a direction facing the electrode assembly beyond the surrounding area, or the surrounding area protrudes in a direction facing the electrode assembly beyond the inner end surface of the pole post body.

19. The battery cell of claim 1, wherein, The pole post assembly includes a pole post body, the pole post body includes a first pole post member and a second pole post member, the second pole post member is mounted to the first shell wall and defines a fitting hole, the first pole post member is mounted to the side of the second pole post member facing away from the electrode assembly and covers the fitting hole, and the electrode assembly is connected to the first pole post member through a conductive part extending into the fitting hole.

20. The battery cell of claim 19, wherein, The first shell wall has a mounting hole, the second pole post member passes through the mounting hole and is clamped on both the inner and outer sides of the first shell wall, and an insulating sealing member is arranged between the second pole post member and the first shell wall.

21. The battery cell of any one of claims 1-20, wherein, The pole post assembly includes a pole post body, the surface of the end of the pole post body facing the electrode assembly is an inner end surface of the pole post body, the electrode assembly is connected to the inner end surface of the pole post body through a conductive part, and part of the conductive part is laid on the inner end surface of the pole post body.

22. The battery cell of claim 21, wherein, The inner end surface of the pole post body is inclined relative to the axial section of the electrode assembly, and the axial section of the electrode assembly is perpendicular to the direction of the tab of the electrode assembly.

23. The battery cell of any one of claims 1-22, wherein, The pole post assembly includes a pole post body, the electrode assembly includes an active material coated part accommodated in the accommodating cavity, and a tab part connected to the active material coated part, the tab part extends to the pole post body and is connected to the pole post body.

24. The battery cell of claim 23, wherein, The surface of the end of the pole post body facing the electrode assembly is an inner end surface of the pole post body, the tab part includes a gathered part formed by stacking and connecting a plurality of tab sheets, and at least part of the gathered part is laid on and connected to the inner end surface of the pole post body.

25. The battery cell of any one of claims 1-22, wherein, The pole piece includes a pole body, the electrode piece includes an active material coated portion accommodated in the accommodating cavity, and a tab portion connected to the active material coated portion, and the tab portion is connected to the pole body through a conductive member.

26. The battery cell according to claim 25, wherein, The conductive member includes a first connecting section, the first connecting section includes two clamping portions, the tab portion includes a tab end portion clamped between the two clamping portions and connected to the clamping portions.

27. The battery cell of claim 26, wherein, The surface of the end of the pole body facing the electrode piece is an inner end surface of the pole body, the conductive member includes a second connecting section laid on and connected to the inner end surface of the pole body, the conductive member is bent at the connecting position of the first connecting section and the second connecting section, so that the first connecting section is located on the side of the second connecting section away from the pole body, and one of the clamping portions is supported on the side of the tab end portion away from the pole body.

28. The battery cell of claim 25, wherein, The tab portion includes a folded portion formed by stacking and connecting multiple tab sheets, the conductive member includes a first connecting section, and the folded portion is stacked on one side of the first connecting section in the thickness direction and connected to the first connecting section.

29. The battery cell of claim 28, wherein, The surface of the end of the pole body facing the electrode piece is an inner end surface of the pole body, and the first connecting section is supported on the side of the folded portion away from the pole body, so that the folded portion is clamped between the inner end surface of the pole body and the first connecting section.

30. The battery cell of any one of claims 1-29, wherein, The pole piece includes a pole body, the electrode piece includes an active material coated portion accommodated in the accommodating cavity, the active material coated portion is connected to the pole body through a conductive portion, the conductive portion is bent to form at least two open grooves, the openings of the two open grooves face different directions and are adjacent in the direction from the pole body to the active material coated portion.

31. The battery cell of claim 30, wherein, The electrode piece includes a tab portion connected to the active material coated portion, the tab portion constitutes the conductive portion to extend to the pole body and be connected to the pole body, and the tab portion is bent alone to form the two open grooves with the openings facing opposite directions and being adjacent; or the electrode piece includes a tab portion connected to the active material coated portion, the conductive portion includes the tab portion and a conductive member connected to the tab portion, the tab portion is connected to the pole body through the conductive member, and the conductive member and the tab portion are bent together to form the two open grooves with the openings facing opposite directions and being adjacent.

32. The battery cell of any one of claims 1-31, wherein, The shell piece further includes a fitting shell, the shell body is in a semi-closed cylindrical shape, and the fitting shell cover is arranged on the opening. The fitting shell is in a flat plate shape or a semi-closed cylindrical shape.

33. The battery cell of any one of claims 1-32, wherein, The pressure relief device is arranged on the shell piece and located on the same side or different side of the pole piece.

34. A battery, wherein, The battery cell includes the battery cell according to any one of claims 1-33.

35. The battery of claim 34, wherein, The battery includes a case, a plurality of battery cells are accommodated in the case, a bottom of the case is a case bottom plate, and the pole member is provided on a side of the housing member facing the case bottom plate or on a side of the housing member facing away from the case bottom plate.

36. An electrical device, comprising: The battery includes the battery according to claim 34 or 35.

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