A single cell and a battery pack

Abstract

The application provides a single battery and a battery pack. The single battery comprises a top cover plate, a pole body and a pole ring. The top cover plate has a first surface and a second surface oppositely arranged along a first direction. The top cover plate is provided with a pole hole penetrating through the first surface and the second surface along the first direction. The pole body is arranged in the pole hole and has an outer circumferential surface arranged around the first direction. The pole ring is connected to the first surface and has an inner annular surface arranged around the first direction. The inner annular surface of the pole ring is welded to the outer circumferential surface of the pole body. The single battery of the application adopts a split pole structure. The pole body and the pole ring can be assembled in sequence, which greatly simplifies the assembly mode of the pole and reduces the assembly difficulty. Meanwhile, the thickness and strength required for riveting need not be considered, the influence of the pole structure on other components on the circumferential side can be reduced, and the optimization and improvement of the single battery are facilitated.

Description

Technical Field

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

[0002] A single battery cell typically includes a casing, electrode core, terminal post, and top cover. The casing has a single-sided open structure, and the top cover is connected to the open part of the casing. The top cover and the casing enclose a space containing electrolyte. The electrode core is located in the space, forming the core charging and discharging unit of the single battery cell.

[0003] The top cover plate has terminal hole holes. During assembly of the single battery cell, one side of the terminal needs to be connected to the core, and the other side of the terminal extends out through the terminal hole to facilitate connection with external circuitry, enabling the charging and discharging function of the single battery cell. In existing technology, rivet blocks are typically used to apply pressure to the terminal to deform it, thereby fixing the terminal to the top cover plate. To prevent excessive deformation, the thickness and strength of the terminal need to meet certain requirements. However, this terminal structure can easily limit the optimization of other surrounding components, hindering the optimization and improvement of the single battery cell. Summary of the Invention

[0004] In view of this, this application provides a single cell and a battery pack to at least solve the problem that the structure of the terminal post in the prior art easily restricts the optimization of other components on its periphery, which is not conducive to the optimization and improvement of the single cell.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: This application provides a single-cell battery, including: a top cover plate, an electrode post, and an electrode post ring; the top cover plate has a first surface and a second surface disposed opposite to each other along a first direction, and the top cover plate is provided with an electrode post hole that penetrates the first surface and the second surface along the first direction; the electrode post is disposed through the electrode post hole and has an outer peripheral surface disposed around the first direction; the electrode post ring is connected to the first surface and has an inner ring surface disposed around the first direction; the inner ring surface of the electrode post ring is welded to the outer peripheral surface of the electrode post.

[0006] Optionally, the pole ring has a first half-groove, which is located on the side of the pole ring away from the top cover plate along the first direction and is close to the inner ring surface of the pole ring; the pole body has a second half-groove, which is located on the side of the pole body away from the top cover plate along the first direction and is close to the outer peripheral surface of the pole body; the first half-groove and the second half-groove together form a welding groove.

[0007] Optionally, the welding groove has a welding surface, and a weld is formed between the inner ring surface of the pole ring and the outer peripheral surface of the pole body, the weld penetrating the welding surface along the first direction; wherein the welding surface is located on one side of the first surface.

[0008] Optionally, along the first direction, the orthographic projection of the inner annular surface of the pole ring onto the plane where the first surface is located is located within the pole hole.

[0009] Optionally, the single cell further includes: an insulating component and a sealing ring; the insulating component and the sealing ring are respectively connected to both sides of the electrode ring along the first direction; along the radial direction of the electrode ring, the insulating component and the sealing ring both extend to the inner ring surface of the electrode ring on the side opposite to the electrode body.

[0010] Optionally, the inner ring surface of the pole ring is provided with a first limiting portion, and the outer peripheral surface of the pole body is provided with a second limiting portion. The first limiting portion and the second limiting portion are in concave-convex cooperation to restrict the movement of the pole body and the pole ring along the first direction.

[0011] Optionally, the first limiting part is located on the inner ring surface near the first surface, and the first limiting part is a groove; the second limiting part is located on the outer peripheral surface near the first surface, and the second limiting part is a protrusion.

[0012] Optionally, the insulating component includes a first insulating member, which includes a first insulating portion and a second insulating portion connected to each other; the first insulating portion is connected to the side of the pole ring away from the top cover plate along the first direction; the pole ring also has an outer ring surface arranged around the first direction, and the second insulating portion is connected to the outer ring surface of the pole ring.

[0013] Optionally, the insulating assembly further includes a retaining ring and a second insulating member; the retaining ring is connected to the first surface, the retaining ring has an inner surface and an outer surface disposed opposite to each other along the first direction, the inner surface of the retaining ring is connected to the first insulating part and the second insulating part respectively; the second insulating member covers the outer surface of the retaining ring.

[0014] Optionally, the first surface is provided with a recessed portion, which is recessed toward the second surface along the first direction; the pole hole passes through the recessed portion, and the pole ring is connected to the recessed portion.

[0015] This application also provides a battery pack including any of the individual cells described in the preceding claims.

[0016] Compared with the prior art, the single cell and battery pack described in this application have the following advantages: The single-cell battery of this application adopts a split-type terminal structure, which is composed of a terminal body and a terminal ring welded together. During assembly, the terminal body and terminal ring can be assembled sequentially to flexibly adapt to the space on the top cover plate, greatly simplifying the assembly method and reducing the assembly difficulty, thereby improving the manufacturing efficiency of the single-cell battery. At the same time, the split-type terminal structure of the single-cell battery eliminates the need to consider the thickness and strength requirements of riveting, allowing for more flexible settings of the size and material of the terminal body and terminal ring. This facilitates the comprehensive optimization of the terminal structure in terms of conductivity, connection, and cost, and also reduces the impact of the terminal structure on other surrounding components, thus benefiting the optimization and improvement of the single-cell battery.

[0017] The battery pack of this application has the same or similar advantages as the existing technology and the aforementioned single battery cells, which will not be repeated here. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of a single battery cell in an embodiment of this application; Figure 2 yes Figure 1 Exploded view of the structure of section I; Figure 3 This is a partial cross-sectional schematic diagram of a single cell in an embodiment of this application; Figure 4 This is a schematic diagram of the pole ring in an embodiment of this application; Figure 5 This is a schematic diagram of the pole piece in an embodiment of this application.

[0019] Explanation of reference numerals in the attached figures: 1-Top cover plate, 10-Pole post hole, 11-First surface, 12-Second surface, 110-Recessed part, 2-Pole cylinder, 201-Outer peripheral surface, 21-Second half-groove, 22-Second limiting part, 3-Pole post ring, 301-Inner annular surface, 302-Outer annular surface, 31-First half-groove, 32-First limiting part, 40 - Welding groove, 401 - Welding surface, 402 - Weld seam 5-Insulating component, 51-First insulating element, 511-First insulating portion, 512-Second insulating portion, 52-Retaining ring, 521-Inner surface, 522-Outer surface, 53-Second insulating element 6 - Sealing ring, Z - First direction. Detailed Implementation

[0020] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0022] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] The following is combined with Figures 1 to 5 This application describes a single battery cell and a battery pack according to embodiments thereof, wherein... Figure 1 This is a schematic diagram of a single battery cell in an embodiment of this application. Figure 2 yes Figure 1 Exploded view of the structure of section I. Figure 3 This is a partial cross-sectional schematic diagram of a single cell in an embodiment of this application. Figure 4 This is a schematic diagram of the pole ring in an embodiment of this application. Figure 5This is a schematic diagram of the pole piece in an embodiment of this application.

[0025] The single-cell battery provided in this application embodiment includes: a top cover plate 1, an electrode post 2, and an electrode post ring 3; the top cover plate 1 has a first surface 11 and a second surface 12 disposed opposite to each other along a first direction Z, and the top cover plate 1 is provided with an electrode post hole 10 that passes through the first surface 11 and the second surface 12 along the first direction Z; the electrode post 2 passes through the electrode post hole 10 and has an outer peripheral surface 201 disposed around the first direction Z; the electrode post ring 3 is connected to the first surface 11 and has an inner ring surface 301 disposed around the first direction Z; the inner ring surface 301 of the electrode post ring 3 is welded to the outer peripheral surface 201 of the electrode post 2.

[0026] Specifically, such as Figures 1 to 3 As shown, the top cover plate 1 is provided with an electrode post hole 10 that penetrates the first surface 11 and the second surface 12 along the first direction Z. The electrode post 2 is inserted into the electrode post hole 10. One side of the electrode post 2 along the first direction Z is used to connect with the electrode core inside the single cell, and the other side of the electrode post 2 along the first direction Z is used to connect with the external circuit. This realizes the flow of current between the internal current of the single cell and the external circuit current, and realizes the charging and discharging function of the single cell.

[0027] like Figure 3 As shown, the terminal ring 3 surrounds the outer periphery of the terminal body 2 and is connected to the first surface 11 of the top cover plate 1. A sealing ring 6 can be provided between the terminal ring 3 and the first surface 11. The sealing ring 6 is also in the form of a ring and is provided between the terminal ring 3 and the first surface 11 to achieve insulation between the terminal ring 3 and the top cover plate 1, so as to avoid electrical contact between the two and cause a short circuit in the single cell.

[0028] The electrode post 2 has an outer peripheral surface 201 arranged around the first direction Z, and the electrode post ring 3 has an inner ring surface 301 arranged around the first direction Z. The inner ring surface 301 of the electrode post ring 3 is welded to the outer peripheral surface 201 of the electrode post 2. Through the welding of the inner ring surface 301 and the outer peripheral surface 201, a complete electrode post structure is formed. That is, in the single cell of this application embodiment, the electrode post structure is a split structure, which is welded from the electrode post 2 and the electrode post ring 3. When the single cell is manufactured, the electrode post 2 can be first assembled. The electrode 2 is inserted into the electrode hole 10 of the top cover plate 1, so that the electrode 2 is connected to the electrode core inside the single cell. Then, the electrode ring 3 is placed around the outer periphery of the electrode 2, and the electrode ring 3 is connected to the outer peripheral surface 201 of the electrode 2 and the first surface 11 of the top cover plate 1 respectively; or, the electrode ring 3 is first connected to the first surface 11 of the top cover plate 1, and then the electrode 2 is inserted into the electrode hole 10 of the top cover plate 1, and the electrode 2 is connected to the inner ring surface 301 of the electrode ring 3 and the electrode core inside the single cell.

[0029] In existing technologies, rivet blocks are typically used to apply pressure to the electrode post, causing it to deform and thus fixing it to the top cover plate. To prevent excessive deformation, the electrode post's thickness and strength must meet certain requirements. However, this structure can limit the optimization of other surrounding components. In contrast, this application's embodiment employs a split electrode post structure, where the electrode post body 2 and electrode post ring 3 are welded together. During assembly, the electrode post body 2 and electrode post ring 3 can be assembled sequentially to flexibly adapt to the space on the top cover plate 1, greatly simplifying the assembly method and reducing assembly difficulty, thereby improving the manufacturing efficiency of single-cell batteries. Meanwhile, the split-type electrode structure adopted in this application embodiment does not require consideration of the thickness and strength requirements of riveting, and can more flexibly set the size and material of the electrode body 2 and electrode ring 3. For example, since the electrode body 2 mainly undertakes the function of conduction, a material with high conductivity, such as copper or aluminum, can be selected according to the charge and discharge rate and current carrying capacity requirements of the single battery. The electrode ring 3 mainly undertakes the function of connection and fixation with the top cover plate 1, and a material with stronger rigidity and better adaptability, such as copper-aluminum alloy, can be selected according to the assembly strength. In this way, it is more conducive to the comprehensive optimization of the electrode structure in terms of conductivity, connection, cost, etc., and can also reduce the impact of the electrode structure on other surrounding components, thereby facilitating the optimization and improvement of the single battery.

[0030] Optionally, in some embodiments of this application, reference is made to Figures 3 to 5 The pole ring 3 has a first half-groove 31, which is located on the side of the pole ring 3 away from the top cover plate 1 along the first direction Z, and the first half-groove 31 is close to the inner ring surface 301 of the pole ring 3; the pole body 2 has a second half-groove 21, which is located on the side of the pole body 2 away from the top cover plate 1 along the first direction Z, and the second half-groove 21 is close to the outer peripheral surface 201 of the pole body 2; the first half-groove 31 and the second half-groove 21 form a welding groove 40.

[0031] Specifically, the first half-groove 31 and the second half-groove 21 are both located on the side opposite to the first surface 11 of the top cover plate 1. The first half-groove 31 and the second half-groove 21 enclose and form a welding groove 40. When welding the inner ring surface 301 of the electrode ring 3 to the outer peripheral surface 201 of the electrode body 2, the welding head of the welding equipment can be placed within the welding groove 40. The welding groove 40 can physically limit the welding head of the welding equipment, preventing the welding head from shifting during the welding process. This makes it easier for the welding head to align with the weld seam 402 between the inner ring surface 301 of the electrode ring 3 and the outer peripheral surface 201 of the electrode body 2, thereby reducing problems such as incomplete welding and misaligned welding caused by positioning deviations and ensuring the consistency of the welded connection. At the same time, the welding groove 40 can constrain the molten solder generated during the welding process, preventing the molten solder from overflowing the welding area and adhering to the top cover plate 1 or other components, thereby helping to keep the individual battery cells clean.

[0032] Optionally, in some embodiments of this application, reference is made to Figure 3 The welding groove 40 has a welding surface 401, and a weld 402 is formed between the inner ring surface 301 of the pole ring 3 and the outer peripheral surface 201 of the pole body 2. The weld 402 penetrates the welding surface 401 along the first direction Z; wherein, the welding surface 401 is located on one side of the first surface 11.

[0033] Specifically, the inner annular surface 301 of the pole ring 3 is welded to the outer peripheral surface 201 of the pole body 2. Therefore, a weld 402 for accommodating solder is formed between the inner annular surface 301 of the pole ring 3 and the outer peripheral surface 201 of the pole body 2. The extension direction of the weld 402 is determined by the inner annular surface 301 of the pole ring 3 and the outer peripheral surface 201 of the pole body 2. Figure 3 In the single cell shown, the weld seam 402 extends along the first direction Z and penetrates the welding surface 401 along the first direction Z. When the welding head of the welding equipment performs welding operation in the welding tank 40, some molten solder flows into the weld seam 402 and some molten solder accumulates on the welding surface 401, thereby completing the welding connection between the inner ring surface 301 of the electrode ring 3 and the outer peripheral surface 201 of the electrode body 2.

[0034] The welding surface 401 is located on the side of the first surface 11 away from the second surface 12. That is, the welding position between the electrode ring 3 and the electrode body 2 is higher than the first surface 11 of the top cover plate 1. This makes it easier to reduce the thickness of the top cover portion of the single battery along the first direction Z, thereby reducing the overall height of the single battery. At the same time, the reduction in the thickness of the top cover portion can be directly converted into space for the arrangement of the electrode core inside the single battery. Under the premise of a fixed single battery casing size, a larger electrode core can be accommodated, thereby improving the energy density of the single battery.

[0035] Optionally, in some embodiments of this application, reference is made to Figure 3 Along the first direction Z, the orthographic projection of the inner annular surface 301 of the pole ring 3 onto the plane where the first surface 11 is located is within the pole hole 10. Since the inner annular surface 301 of the pole ring 3 is welded to the outer peripheral surface 201 of the pole body 2, it can also be understood that the orthographic projection of the outer peripheral surface 201 of the pole body 2 onto the first surface 11 is within the pole hole 10, and the orthographic projection of the weld 402 formed between the inner annular surface 301 of the pole ring 3 and the outer peripheral surface 201 of the pole body 2 onto the first surface 11 is within the pole hole 10. Thus, when the laser welding beam of the welding equipment operates in the welding tank 40, its effective range is limited to the pole hole 10, and the welding beam energy will not directly irradiate the solid area of ​​the top cover plate 1. This can effectively avoid defects such as deformation, melting through, and surface oxidation of the top cover plate 1 due to high-temperature laser burning, and ensure the structural integrity of the top cover plate 1.

[0036] Optionally, in some embodiments of this application, reference is made to Figure 3The single cell also includes: an insulating component 5 and a sealing ring 6; the insulating component 5 and the sealing ring 6 are respectively connected to both sides of the electrode ring 3 along the first direction Z; along the radial direction of the electrode ring 3, the insulating component 5 and the sealing ring 6 both extend to the side of the inner ring surface 301 of the electrode ring 3 away from the electrode body 2.

[0037] Specifically, the insulating component 5 and the sealing ring 6 are respectively connected to both sides of the terminal ring 3 along the first direction Z. The sealing ring 6 is located between the terminal ring 3 and the first surface 11 of the top cover plate 1, which can achieve insulation between the terminal ring 3 and the top cover plate 1, and prevent electrical contact between the two from causing a short circuit in the single cell. The insulating component 5 is used to achieve insulation between the terminal ring 3 and the external environment, so as to ensure the safety of the single cell.

[0038] The pole ring 3 has an outer ring surface 302 arranged around the first direction Z, which is opposite to the inner ring surface 301. Along the radial direction of the pole ring 3, the insulating component 5 and the sealing ring 6 both extend to the side of the inner ring surface 301 of the pole ring 3 away from the pole body 2. This means that along the radial direction of the pole ring 3, the insulating component 5 and the sealing ring 6 both extend between the inner ring surface 301 and the outer ring surface 302 of the pole ring 3, or extend to the side of the outer ring surface 302 of the pole ring 3 away from the inner ring surface 301. This arrangement, on the one hand, allows the insulating component 5 and the sealing ring 6 to be located on one side of the weld 402, and the pole body 2 to be located on the other side of the weld 402, thereby avoiding interference between the insulating component 5 and the sealing ring 6 and the welding of the pole ring 3 and the pole body 2, and improving the stability of the welding quality. On the other hand, the insulating components 5 and sealing rings 6 are mostly made of polymer or rubber materials, which are not resistant to high temperatures. By offsetting the insulating components 5 and sealing rings 6 from the weld seam 402, it is possible to avoid them being burned by the high temperature of welding, which could cause softening or deformation. This ensures the insulation performance of the insulating components 5 and the sealing reliability of the sealing rings 6. Optionally, in some embodiments of this application, reference is made to Figures 3 to 5 The inner ring surface 301 of the electrode ring 3 is provided with a first limiting portion 32, and the outer peripheral surface 201 of the electrode body 2 is provided with a second limiting portion 22. The first limiting portion 32 and the second limiting portion 22 are in a concave-convex fit to restrict the movement of the electrode body 2 and the electrode ring 3 along the first direction Z. The concave-convex fit between the first limiting portion 32 and the second limiting portion 22 means that one of the first limiting portion 32 and the second limiting portion 22 can be a groove, and the other can be a protrusion. This concave-convex fit restricts the movement of the electrode body 2 and the electrode ring 3 along the first direction Z, ensuring the uniformity of the butt weld 402 between the inner ring surface 301 of the electrode ring 3 and the outer peripheral surface 201 of the electrode body 2, thus helping to ensure welding quality. Furthermore, the concave-convex fit structure is simple, easy to process, and beneficial to improving the manufacturing efficiency of single-cell batteries.

[0039] Optionally, in some embodiments of this application, reference is made to Figures 3 to 5 The first limiting part 32 is located on the inner ring surface 301 near the first surface 11, and the first limiting part 32 is a groove; the second limiting part 22 is located on the outer peripheral surface 201 near the first surface 11, and the second limiting part 22 is a protrusion.

[0040] Specifically, the pole ring 3 also has an upper surface and a lower surface arranged opposite each other along the first direction Z. The upper surface and the lower surface are respectively connected to the inner ring surface 301. The lower surface is located on the side near the first surface 11 of the top cover plate 1 and is connected to the sealing ring 6. The first limiting part 32 is located on the side near the first surface 11, that is, the first limiting part 32 is located on the side near the lower surface of the pole ring 3. The first limiting part 32 is a groove. The first limiting part 32 can penetrate the lower surface of the pole ring 3 along the first direction Z to form a groove structure including two groove walls. This groove structure is simpler and easier to process. Alternatively, the first limiting part 32 can not penetrate the lower surface of the pole ring 3 along the first direction Z to form a groove structure including three groove walls. This groove structure is more stable. Figure 3 The diagram shows the first limiting portion 32 penetrating the lower surface of the pole ring 3 along the first direction Z. Correspondingly, the second limiting portion 22 is also located on the side of the outer peripheral surface 201 near the first surface 11. The second limiting portion 22 is a protrusion adapted to the groove structure and is embedded in the groove.

[0041] In this embodiment, the first limiting part 32 and the second limiting part 22 are both located on the side close to the first surface 11 of the top cover plate 1. That is, the first limiting part 32 and the second limiting part 22 are located away from the welding surface 401, thereby reducing the influence of the first limiting part 32 and the second limiting part 22 on the welding process and ensuring reliable welding between the electrode ring 3 and the electrode body 2. At the same time, the cooperation between the protrusion and the groove can receive the laser welding beam passing through the weld 402, preventing the laser welding beam from directly shining into the single cell, thereby improving the safety of the single cell manufacturing process. In addition, the arrangement of this embodiment can effectively prevent the electrode body 2 from coming off along the first direction Z upward during assembly or welding, ensuring the reliability of the connection between the electrode body 2 and the inner electrode core of the single cell, as well as the reliability of the welding between the electrode body 2 and the electrode ring 3.

[0042] Optionally, in some embodiments of this application, reference is made to Figure 3 The insulating component 5 includes a first insulating member 51, which includes a first insulating portion 511 and a second insulating portion 512 connected to each other. The first insulating portion 511 is connected to the side of the pole ring 3 away from the top cover plate 1 along the first direction Z. The pole ring 3 also has an outer ring surface 302 arranged around the first direction Z, and the second insulating portion 512 is connected to the outer ring surface 302 of the pole ring 3.

[0043] Specifically, the first insulating part 511 is connected to the side of the pole ring 3 facing away from the top cover plate 1 along the first direction Z, which can achieve insulation of the upper surface of the pole ring 3. The first insulating part 511 can cover part of the upper surface of the pole ring 3 or cover all of the upper surface of the pole ring 3. The second insulating part 512 is connected to the outer ring surface 302 of the pole ring 3, which can achieve insulation of the outer ring surface 302 of the pole ring 3. The second insulating part 512 can cover part of the outer ring surface 302 of the pole ring 3 or cover all of the outer ring surface 302 of the pole ring 3. In order to ensure the insulation protection effect of the first insulating part 51 on the pole ring 3, the first insulating part 511 and the second insulating part 512 can be set to cover as much area of ​​the surface of the pole ring 3 as possible.

[0044] Optionally, in some embodiments of this application, reference is made to Figure 3 The insulating component 5 also includes a retaining ring 52 and a second insulating member 53; the retaining ring 52 is connected to the first surface 11, and the retaining ring 52 has an inner surface 521 and an outer surface 522 disposed opposite to each other along the first direction Z, and the inner surface 521 of the retaining ring 52 is connected to the first insulating part 511 and the second insulating part 512 respectively; the second insulating member 53 covers the outer surface 522 of the retaining ring 52.

[0045] Specifically, the inner surface 521 of the fixing ring 52 is connected to the first insulating part 511 and the second insulating part 512 respectively. That is, the first insulating part 51 achieves insulation between the fixing ring 52 and the pole ring 3. The second insulating part 53 covers the outer surface 522 of the fixing ring 52. That is, the second insulating part 53 achieves insulation between the fixing ring 52 and the external environment.

[0046] This design, on the one hand, compared to existing technologies, abandons the solution of using injection molding to achieve insulation of the fixing ring. It eliminates the need for complex molding processes, requiring only simple operations such as embedding and welding to complete the insulation treatment of the fixing ring 52. This significantly reduces the process difficulty and cost of insulating the fixing ring 52, thereby improving the manufacturing efficiency of individual cells and saving on manufacturing costs. On the other hand, the insulation layer formed by injection molding is typically thicker due to process limitations. This embodiment uses independent first insulating component 51 and second insulating component 53, enabling higher precision processing and a thinner design. This, in turn, helps reduce the overall height of the individual cell, achieving a lightweight design.

[0047] On the other hand, the first insulating component 51 and the second insulating component 53 are two independent parts, which facilitates assembly and simplifies the insulation method of the fixing ring 52. If the first insulating component 51 and the second insulating component 53 are damaged, they can be replaced separately without scrapping the entire insulating assembly, which greatly reduces the later maintenance cost of the single battery.

[0048] Optionally, in some embodiments of this application, reference is made to Figure 2 The first surface 11 has a recessed portion 110, which sinks downwards towards the second surface 12 along the first direction Z. An electrode post hole 10 penetrates the recessed portion 110, and an electrode post ring 3 is connected to the recessed portion 110. The recessed portion 110 sinks towards the second surface 12 along the first direction Z to form a recessed cavity. The electrode post ring 3 is connected to the recessed portion 110, meaning that the electrode post ring 3 is embedded in the recessed cavity. This arrangement helps reduce the space occupied by the electrode post ring 3 in the first direction Z, thereby reducing the thickness of the top cover portion of the single battery along the first direction Z and lowering the overall height of the single battery. Simultaneously, the reduction in the thickness of the top cover portion can directly translate into more space for the internal electrode core arrangement of the single battery. Given a fixed single battery casing size, it can accommodate larger electrode cores, thereby increasing the energy density of the single battery.

[0049] This application also provides a battery pack, including the single battery cells described in any of the foregoing embodiments. The battery pack includes multiple single batteries and a housing, busbar assembly, etc. Multiple single batteries are housed within the housing and formed into a battery group by series, parallel, or a combination of series and parallel connections. The battery group is electrically connected to the busbar assembly, which is used to draw current from the battery group to achieve the charging and discharging function of the battery pack.

[0050] The battery pack uses the single-cell battery described in any of the foregoing embodiments, and therefore also has the following advantages: The single-cell battery adopts a split terminal structure, which is formed by welding the terminal body 2 and the terminal ring 3. During assembly, the terminal body 2 and the terminal ring 3 can be assembled sequentially to flexibly adapt to the space on the top cover plate 1, greatly simplifying the assembly method of the terminal and reducing the assembly difficulty, thereby improving the manufacturing efficiency of the single-cell battery. At the same time, the split terminal structure of the single-cell battery does not require consideration of the thickness and strength requirements of riveting, and the size and material of the terminal body 2 and the terminal ring 3 can be set more flexibly. This is more conducive to the comprehensive optimization of the terminal structure in terms of conductivity, connection, cost, etc., and can also reduce the impact of the terminal structure on other surrounding components, thereby facilitating the optimization and improvement of the single-cell battery.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "exemplary," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A single-cell battery, characterized in that, The single cell includes: a top cover plate (1), an electrode post (2), and an electrode post ring (3); The top cover plate (1) has a first surface (11) and a second surface (12) arranged opposite to each other along a first direction (Z), and the top cover plate (1) is provided with a pole hole (10) that penetrates the first surface (11) and the second surface (12) along the first direction (Z). The pole piece (2) passes through the pole hole (10) and has an outer peripheral surface (201) arranged around the first direction (Z). The pole ring (3) is connected to the first surface (11) and has an inner annular surface (301) arranged around the first direction (Z). The inner ring surface (301) of the pole ring (3) is welded to the outer peripheral surface (201) of the pole body (2).

2. The single-cell battery according to claim 1, characterized in that, The pole ring (3) has a first half groove (31), which is located on the side of the pole ring (3) away from the top cover plate (1) along the first direction (Z), and the first half groove (31) is close to the inner ring surface (301) of the pole ring (3). The pole post (2) has a second half groove (21), which is located on the side of the pole post (2) away from the top cover plate (1) along the first direction (Z), and the second half groove (21) is close to the outer peripheral surface (201) of the pole post (2). The first half-groove (31) and the second half-groove (21) enclose each other to form a welding groove (40).

3. The single-cell battery according to claim 2, characterized in that, The welding groove (40) has a welding surface (401), and a weld (402) is formed between the inner ring surface (301) of the pole ring (3) and the outer peripheral surface (201) of the pole body (2). The weld (402) penetrates the welding surface (401) along the first direction (Z). The welding surface (401) is located on one side of the first surface (11).

4. The single-cell battery according to claim 1, characterized in that, Along the first direction (Z), the orthographic projection of the inner ring surface (301) of the pole ring (3) onto the plane where the first surface (11) is located is located within the pole hole (10).

5. The single-cell battery according to claim 1, characterized in that, The single cell also includes: an insulating component (5) and a sealing ring (6); The insulating component (5) and the sealing ring (6) are respectively connected to both sides of the pole ring (3) along the first direction (Z); Along the radial direction of the pole ring (3), the insulating component (5) and the sealing ring (6) both extend to the inner annular surface (301) of the pole ring (3) away from the pole body (2).

6. The single-cell battery according to claim 1, characterized in that, The inner ring surface (301) of the pole ring (3) is provided with a first limiting part (32), and the outer peripheral surface (201) of the pole body (2) is provided with a second limiting part (22). The first limiting part (32) and the second limiting part (22) are in concave-convex cooperation to restrict the movement of the pole body (2) and the pole ring (3) along the first direction (Z).

7. The single-cell battery according to claim 6, characterized in that, The first limiting part (32) is located on the inner ring surface (301) near the first surface (11), and the first limiting part (32) is a groove; the second limiting part (22) is located on the outer peripheral surface (201) near the first surface (11), and the second limiting part (22) is a protrusion.

8. The single-cell battery according to claim 5, characterized in that, The insulating component (5) includes a first insulating member (51), which includes a first insulating part (511) and a second insulating part (512) connected to each other. The first insulating part (511) is connected to the side of the pole ring (3) away from the top cover plate (1) along the first direction (Z); The pole ring (3) also has an outer ring surface (302) arranged around the first direction (Z), and the second insulating part (512) is connected to the outer ring surface (302) of the pole ring (3).

9. The single-cell battery according to claim 8, characterized in that, The insulating component (5) also includes a retaining ring (52) and a second insulating element (53); The fixing ring (52) is connected to the first surface (11). The fixing ring (52) has an inner surface (521) and an outer surface (522) arranged opposite to each other along the first direction (Z). The inner surface (521) of the fixing ring (52) is connected to the first insulating part (511) and the second insulating part (512) respectively. The second insulating element (53) covers the outer surface (522) of the fixing ring (52).

10. The single-cell battery according to any one of claims 1 to 9, characterized in that, The first surface (11) is provided with a recessed portion (110), which sinks towards the second surface (12) along the first direction (Z); The pole hole (10) penetrates the recessed part (110), and the pole ring (3) is connected to the recessed part (110).

11. A battery pack, characterized in that, Includes the single-cell battery as described in any one of claims 1 to 10.

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