Single cell and battery pack
By using a separate top cover assembly, the elastic force of the sealing ring is transferred to the pressure ring, which solves the problem of top cover assembly deformation caused by extrusion molding and improves the sealing and insulation of the individual battery cells.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUNWODA MOBILITY ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-07-10
AI Technical Summary
Because the top cover body and the flange are made by extrusion molding, the thickness is reduced, the ability to resist the first direction is poor, and it is easy to deform, which affects the insulation and sealing of the pole and the top cover plate.
Design a split-type top cover assembly, including a top cover plate, an electrode post, a sealing ring, and a pressure ring. The pressure ring is insulated from the electrode post. The elastic force of the sealing ring is transmitted to the pressure ring, which improves the pressure ring's resistance to deformation and avoids a reduction in sealing performance.
It improves the deformation resistance of the pressure ring, ensures the sealing performance of the sealing ring, and prevents the sealing performance from decreasing due to the deformation of the pressure ring.
Smart Images
Figure CN224481071U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a single cell battery and a battery pack. Background Technology
[0002] With the rapid development of new energy vehicles, the safety and reliability of power batteries, as the core component of the vehicle, have attracted much attention.
[0003] In existing top cover sheet structures, a flange is formed by extruding the top cover body. The flange is insulated from the pole post. When the sealing ring applies a force along a first direction to the pole post, the sealing ring also exerts a force along the first direction on the top cover body and the flange, where the first direction refers to the axial direction of the pole post. However, because the flange is formed by extruding the top cover body, not only is the thickness of the flange limited, resulting in poor resistance to the first direction, but the strength of the position where the flange is extruded from the top cover body is also reduced, further weakening the top cover body's resistance to the first direction.
[0004] In summary, because the top cover body and the flange are extruded, the reduced thickness of the top cover body and the flange makes them prone to deformation under stress. Due to the poor resistance to the first direction and the possible deformation, the insulation and sealing performance of the pole and the top cover plate are affected. Utility Model Content
[0005] The technical problem to be solved by this utility model is that the top cover body and the flange are extruded and the reduced thickness of the top cover body and the flange makes them easy to deform under stress. Due to the poor resistance to the first direction and the possible deformation, the insulation and sealing of the pole and the top cover plate are affected.
[0006] To solve the above-mentioned technical problems, this utility model provides a technical solution for a single battery cell:
[0007] A single-cell battery, having a first orientation, includes:
[0008] A top cover assembly includes a top cover plate, a pole, a sealing ring, and a pressure ring. The top cover plate has a through hole, the pole passes through the through hole, and the sealing ring is elastic and disposed between the pole and the wall of the through hole. The top cover plate includes a top cover body and a convex ring. The through hole extends through the top cover body along a first direction, and the convex ring surrounds the through hole and protrudes from the top cover body along the first direction.
[0009] The pressure ring is fixed to the convex ring, and the pressure ring is located on the side of the convex ring away from the top cover body in the first direction. The pressure ring is insulated from the pole post.
[0010] Furthermore, the top cover plate also includes a retaining ring disposed on the top cover body, the inner wall of the retaining ring forming at least a portion of the hole wall of the through hole, a convex ring disposed on the retaining ring, and the convex ring being located on the side of the retaining ring closer to the pressure ring in the first direction; a portion of the sealing ring is located between the retaining ring and the pole post in the first direction, and the pressure ring is welded to the convex ring.
[0011] Furthermore, the top cover assembly also includes a first plastic and a second plastic. The first plastic is arranged in a ring and sleeved between the outer periphery of the pole post and the inner periphery of the convex ring. The first plastic abuts against at least one of the pressure ring, the convex ring, and the retaining ring. The second plastic is arranged in a ring and sleeved on the outer periphery of the pole post. A portion of the second plastic is located between the pole post and the pressure ring. At least a portion of the pressure ring and at least a portion of the convex ring are located between the first plastic and the second plastic.
[0012] Furthermore, a portion of the sealing ring is located radially between the retaining ring and the pole post in the through hole; and / or, the top cover body, the convex ring, and the retaining ring are integrally formed.
[0013] Furthermore, the pressure ring has a first surface in the first direction, and the convex ring has a second surface in the first direction, the second surface being welded to the first surface.
[0014] Furthermore, one of the pressure ring and the convex ring is provided with a groove, the groove being in a limiting fit with the other, and the pressure ring and the convex ring are welded to the groove;
[0015] Alternatively, one of the pressure ring and the convex ring may have a groove and the other may have a convex portion, with the convex portion engaging with the groove portion for a limiting fit, and the pressure ring and the convex ring being welded to the convex portion.
[0016] Furthermore, the pressure ring is provided with a first chamfered surface, and the convex ring is provided with a second chamfered surface, the second chamfered surface being adapted to and welded to the first chamfered surface.
[0017] Furthermore, the pressure ring has a first surface in the first direction, the first surface facing the convex ring, the convex ring also having a support surface, the support surface being connected to the second chamfered surface, and the support surface being welded to a portion of the first surface.
[0018] Furthermore, the single battery also includes a housing and an electrode assembly. The housing has a receiving cavity, the top cover is connected to the housing and seals the receiving cavity, and the electrode assembly is disposed in the receiving cavity. The electrode assembly has a first tab and a second tab.
[0019] The through hole is provided in two parts, namely the first through hole and the second through hole. The pole post is provided in two parts, namely the first pole post and the second pole post. The first pole post passes through the first through hole, and the second pole post passes through the second through hole. The first pole post is electrically connected to the first pole tab, and the second pole post is electrically connected to the second pole tab.
[0020] To solve the above-mentioned technical problems, this utility model also provides a technical solution for a battery pack:
[0021] A battery pack comprising the individual battery cells described in any of the above technical solutions.
[0022] Compared with existing technologies, the advantages of this single-cell battery and battery pack are as follows: During the operation of the single-cell battery, while the sealing ring seals the connection between the terminal and the top cover, the elasticity of the sealing ring applies a force in the first direction to the terminal. Since the terminal is connected to the pressure ring, this force is further applied to the pressure ring, which can easily lead to deformation. Traditional pressure rings are integrally extruded from the top cover, and their thickness and material are affected by the top cover itself, resulting in poor resistance to deformation. In contrast, the pressure ring and top cover are separate components in this invention. The material and thickness of the pressure ring are no longer limited by the material or thickness of the top cover itself, thereby further improving the pressure resistance and deformation resistance of the pressure ring. This prevents the pressure ring from deforming due to the elastic force of the sealing ring, thus avoiding the problem of reduced sealing performance caused by pressure ring deformation. Attached Figure Description
[0023] Figure 1 This is an exploded schematic diagram of a single cell in Embodiment 1 of this utility model;
[0024] Figure 2 This is an exploded view of the top cover assembly of Embodiment 1 of this utility model;
[0025] Figure 3 This is a cross-sectional schematic diagram of the top cover assembly according to Embodiment 1 of this utility model;
[0026] Figure 4 This is a cross-sectional schematic diagram of the top cover and the pressure ring of Embodiment 1 of this utility model;
[0027] Figure 5 This is a cross-sectional schematic diagram of the top cover and the pressure ring of Embodiment 2 of this utility model;
[0028] Figure 6 This is a cross-sectional schematic diagram of the top cover and the pressure ring of Embodiment 3 of this utility model;
[0029] Figure 7 This is a cross-sectional schematic diagram of the top cover and the pressure ring of Embodiment 4 of this utility model;
[0030] Figure 8 This is a cross-sectional schematic diagram of the top cover and pressure ring of Embodiment 5 of this utility model.
[0031] Figure 9 This is a cross-sectional schematic diagram of the top cover and the pressure ring of Embodiment Six of this utility model;
[0032] Figure 10 yes Figure 9 Enlarged view of the top cover plate and pressure ring;
[0033] In the figure: 1-Housing shell, 10-Receiving cavity, 2-Electrode assembly, 21-First electrode tab, 22-Second electrode tab, 3-Top cover assembly, 30-Top cover plate, 300-Top cover body, 301-Protruding ring, 301a-Second surface, 301b-Second chamfered surface, 301c-Support surface, 302-Retaining ring, 303-Through hole, 303a-First through hole, 303b-Second through hole, 31-Electrode post, 31a-First electrode post, 31b-Second electrode post, 32-Sealing ring, 33-Pressure ring, 331-First surface, 332-First chamfered surface, 34-First plastic, 35-Second plastic, a-Groove, b-Protrusion, 4-Explosion-proof valve, 41-Explosion-proof valve protective plate, 5-Third plastic, Z-First direction, X-Second direction. Detailed Implementation
[0034] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.
[0035] In the description of this utility model, 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," and "counterclockwise" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0038] like Figures 1 to 4 As shown, the single-cell battery of Embodiment 1 of this utility model has a first direction Z and includes a top cover assembly 3. The top cover assembly 3 includes a top cover sheet 30, an electrode post 31, a sealing ring 32, and a pressure ring 33. Wherein:
[0039] The top cover plate 30 has a through hole 303, the pole post 31 passes through the through hole 303, and the sealing ring 32 is elastic and is disposed between the pole post 31 and the hole wall of the through hole 303. The top cover plate 30 includes a top cover body 300 and a convex ring 301. The through hole 303 passes through the top cover body 300 along the first direction Z. The convex ring 301 is arranged around the through hole 303 and protrudes from the top cover body 300 along the first direction Z. The pressure ring 33 is fixed to the convex ring 301. The pressure ring 33 is located on the side of the convex ring 301 away from the top cover body 300 in the first direction Z. The pressure ring 33 is insulated from the pole post 31.
[0040] The single battery also includes a housing 1 and an electrode assembly 2. The housing 1 has a receiving cavity 10. A top cover 30 is connected to the housing 1 and seals the receiving cavity 10. The electrode assembly 2 is disposed in the receiving cavity 10. The electrode assembly 2 has a first tab 21 and a second tab 22. There are two through holes 303, namely a first through hole 303a and a second through hole 303b. The first through hole 303a and the second through hole 303b are distributed at intervals along the second direction X. There are two pole posts 31, namely a first pole post 31a and a second pole post 31b. The first pole post 31a passes through the first through hole 303a, and the second pole post 31b passes through the second through hole 303b. The first pole post 31a is electrically connected to the first tab 21, and the second pole post 31b is electrically connected to the second tab 22.
[0041] It should be noted that in this embodiment, the first electrode 21 can be a negative electrode, the first electrode post 31a can be a negative electrode post, and correspondingly, the second electrode 22 can be a positive electrode, and the second electrode post 31b can be a positive electrode post; the first electrode post 31a is located in the first through hole 303a, the second electrode post 31b is located in the second through hole 303b, and at least one of the first electrode post 31a and the second electrode post 31b is insulated from the top cover plate 30.
[0042] This single-cell battery adopts a design consisting of a casing 1, an electrode assembly 2, and a top cover assembly 3. The battery assembly 2 is installed within the receiving cavity 10 of the casing 1. The top cover assembly 3 is connected to the casing 1 and seals the receiving cavity 10. The top cover assembly 3 and the casing 1 provide sealed protection for the electrode assembly 2, ensuring stable electrochemical reactions within the receiving cavity 10. The top cover assembly 3 includes a top cover plate 30, electrode posts 31, a sealing ring 32, and a pressure ring 33. The electrode posts 31 pass through the through-hole 303 of the top cover plate 30 and are electrically connected to the tabs of the electrode assembly 2, thus enabling the electrode assembly 2 to charge and discharge externally.
[0043] The top cover plate 30 has a through hole 303. A sealing ring 32 is disposed between the pole post 31 and the wall of the through hole 303. The sealing ring 32 is elastic and can effectively eliminate gaps between components, ensuring the sealing performance of the internal environment of the housing 1. The top cover plate 30 includes a top cover body 300 and a convex ring 301. The through hole 303 penetrates the top cover body 300 along the first direction Z. The convex ring 301 is arranged around the through hole 303 and protrudes from the top cover body 300 along the first direction Z. A pressure ring 33 is fixed to the convex ring 301. The convex ring 301 provides a connection and force-bearing part for the pressure ring 33. The pressure ring 33 and the convex ring 301 together play a limiting role for the pole post 31, ensuring the reliability of the pole post 31 installation.
[0044] Crucially, during the operation of a single battery cell, while the sealing ring 32 seals the connection between the terminal post 31 and the top cover plate 30, the elasticity of the sealing ring 32 applies a force in the first direction Z to the terminal post 31. Since the terminal post 31 is connected to the pressure ring 33, this force is further applied to the pressure ring 33. Compared to the traditional method of integrally extruding the flange (pressure ring 33) from the top cover plate 30, the pressure ring 33 in this technical solution is separately set from the top cover plate 30. The material or thickness of the pressure ring 33 is no longer constrained by the material or thickness of the top cover plate 30 itself. This further improves the pressure resistance and deformation resistance of the pressure ring 33, preventing it from deforming due to the elastic force of the sealing ring 32, thus avoiding the problem of reduced sealing performance of the sealing ring 32 caused by deformation of the pressure ring 33.
[0045] In this embodiment, the top cover plate 30 further includes a retaining ring 302, which is disposed on the top cover body 300. The inner wall of the retaining ring 302 forms at least a portion of the hole wall of the through hole 303. A convex ring 301 is disposed on the retaining ring 302, and the convex ring 301 is located on the side of the retaining ring 302 closer to the pressure ring 33 in the first direction Z. A portion of the sealing ring 32 is located between the retaining ring 302 and the pole post 31 in the first direction Z. The pressure ring 33 is welded to the convex ring 301. The convex ring 301, the retaining ring 302, and the pressure ring 33 define an annular groove space for the installation of the sealing ring 32, ensuring that the sealing ring 32 applies a reliable force to the pole post 31 in the first direction Z. The welding assembly method is simpler, and the welding process can guarantee the connection strength between the pressure ring 33 and the convex ring 301.
[0046] Furthermore, the top cover assembly 3 also includes a first plastic 34 and a second plastic 35. The first plastic 34 is arranged in a ring and sleeved between the outer periphery of the pole post 31 and the inner periphery of the convex ring 301. The first plastic 34 abuts against at least one of the pressure ring 33, the convex ring 301 and the retaining ring 302. The second plastic 35 is arranged in a ring and sleeved on the outer periphery of the pole post 31. A portion of the second plastic 35 is located between the pole post 31 and the pressure ring 33. At least a portion of the pressure ring 33 and at least a portion of the convex ring 301 are located between the first plastic 34 and the second plastic 35.
[0047] like Figure 3 As shown, the first plastic 34 is generally located between the inner periphery of the convex ring 301 and the outer periphery of the pole post 31. In the first direction Z, the first plastic 34 also abuts against the pressure ring 33 and the retaining ring 302 to separate the pole post 31 and the top cover body 300. A portion of the second plastic 35 is located between the outer periphery of the pole post 31 and the inner periphery of the pressure ring 33. A portion of the second plastic 35 is located on the side of the pressure ring 33 away from the first plastic 34, while another portion of the second plastic 35 is located on the outer periphery of the convex ring 301, thereby completely separating the top cover body 300 and the pole post 31.
[0048] Furthermore, the individual battery also includes a third plastic 5, which is connected to the top cover body 300 and located on the side of the top cover body 300 away from the first plastic 33 and the second plastic 34. The third plastic 5 serves to separate the electrode assembly 2 and the top cover body 300.
[0049] The top cover 30 is also provided with a third plastic 5 on one side corresponding to the electrode assembly 2. The first plastic 34, the second plastic 35 and the third plastic 5 provide comprehensive insulation protection for the pressure ring 33, the convex ring 301, the retaining ring 302, the electrode post 31 and the top cover body 300, so as to prevent short circuit problems in the individual battery cells.
[0050] The structure and assembly relationship between the first terminal 31a and the first through hole 303a, and between the second terminal 31b and the second through hole 303b, are identical. Both locations are equipped with a sealing ring 32, a raised ring 301, a pressure ring 33, a retaining ring 302, and plastic parts. The assembly relationship between the terminal 31 and the through hole 303 applies to the assembly relationship between the first terminal 31a and the first through hole 303a, and the assembly relationship between the second terminal 31b and the second through hole 303b, and will not be discussed further here. Additionally, the top cover 30 is also equipped with an explosion-proof valve 4 and an explosion-proof valve protection plate 41 to ensure battery thermal runaway safety.
[0051] As a further preferred embodiment, a portion of the sealing ring 32 is located radially between the retaining ring 302 and the pole post 31 in the through hole 303, which can effectively seal the gap between the retaining ring 302 and the pole post 31 in the radial direction of the through hole 303.
[0052] Optionally, the top cover body 300, the convex ring 301, and the retaining ring 302 are integrally molded, making the integral molding process simpler.
[0053] Optionally, such as Figure 4 As shown, the pressure ring 33 has a first surface 331 in the first direction Z, and the convex ring 301 has a second surface 301a in the first direction Z. The second surface 301a is welded to the first surface 331, and the first surface 331 and the second surface 301a are surface-to-surface and welded together, thereby ensuring the reliability of the connection between the pressure ring 33 and the convex ring 301.
[0054] To further optimize the local structure of the pressure ring 33 and the convex ring 301 in Embodiment 1, the single cell of Embodiment 2 of this utility model, such as Figure 5 As shown, the convex ring 301 has a groove a, which is matched with the pressure ring 33 for limiting. The pressure ring 33 and the convex ring 301 are welded at the groove a.
[0055] The single-cell battery of Embodiment 3 of this utility model, such as Figure 6 As shown, the pressure ring 33 has a groove a, which engages with the convex ring 301 for positioning. The pressure ring 33 and the convex ring 301 are welded together at the groove a. By utilizing the groove 33 of the convex ring 301 for positioning, or by utilizing the groove 33 of the pressure ring 33 for positioning, the pressure ring 33 and the convex ring 301 are positioned together, ensuring the installation accuracy of the pressure ring 33.
[0056] Alternatively, the single-cell battery of Embodiment 4 of this utility model, such as Figure 7As shown, one of the pressure ring 33 and the convex ring 301 has a groove a, and the other has a convex part b. The convex part b is matched with the groove a for limiting fit, and the pressure ring 33 and the convex ring 301 are welded to the convex part b. By using the limiting fit between the convex part b and the groove a, the pressure ring 33 and the convex ring 301 are positioned, which also ensures the installation accuracy of the pressure ring 33.
[0057] The single-cell battery of Embodiment 5 of this utility model, such as Figure 8 As shown, the local structure of the pressure ring and the convex ring in Embodiment 1 is further optimized. The pressure ring 33 is provided with a first chamfered surface 332, and the convex ring 301 is provided with a second chamfered surface 301b. The second chamfered surface 301b is adapted to and welded to the first chamfered surface 332. By adapting the first chamfered surface 332 to the second chamfered surface 301b, the installation and positioning accuracy of the pressure ring 33 and the convex ring 301 can be guaranteed.
[0058] The single-cell battery of Embodiment Six of this utility model, such as Figure 9 , Figure 10 As shown, the local structure of the pressure ring and the convex ring in Embodiment 5 is further optimized. Specifically, the pressure ring 33 has a first surface 331 in the first direction Z, and the first surface 331 faces the convex ring 301. The convex ring 301 is also provided with a support surface 301c, which is connected to the second chamfer surface 301b. The support surface 301c is welded to a part of the first surface 331. The combination of the convex ring 301 and the support surface 301c can effectively ensure the positioning and installation stability of the pressure ring 33.
[0059] In this embodiment, the pressure ring 33 is an integral ring structure, which is simple to install and has high strength. To meet different usage requirements, in other embodiments, the pressure ring can also be a plurality of separate structures arranged circumferentially around the through hole. The plurality of circumferentially distributed separate structures form a ring, which can limit the position of the pole and the sealing ring.
[0060] In addition, the through hole 303 in this embodiment can be a circular hole. To meet different usage requirements, in other embodiments, the through hole can also be an oblong hole or a polygonal hole. Correspondingly, the contour shapes of the retaining ring, the convex ring, and the pressure ring are matched with the shape of the through hole to meet the installation requirements of poles of different shapes.
[0061] This utility model provides a battery pack, which includes individual batteries. The specific embodiments of each individual battery are the same as those in the specific embodiments of the individual batteries described above, and will not be repeated here.
[0062] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A single-cell battery having a first orientation (Z), characterized in that, include: Top cover assembly (3), the top cover assembly (3) includes a top cover plate (30), a pole (31), a sealing ring (32) and a pressure ring (33), the top cover plate (30) is provided with a through hole (303), the pole (31) passes through the through hole (303), the sealing ring (32) is elastic, and the sealing ring (32) is disposed between the pole (31) and the hole wall of the through hole (303); The top cover plate (30) includes a top cover body (300) and a protruding ring (301). The through hole (303) passes through the top cover body (300) along the first direction (Z). The protruding ring (301) is arranged around the through hole (303) and protrudes from the top cover body (300) along the first direction (Z). The pressure ring (33) is fixed to the convex ring (301). The pressure ring (33) is located on the side of the convex ring (301) away from the top cover body (300) in the first direction (Z). The pressure ring (33) is insulated from the pole post (31).
2. The single-cell battery according to claim 1, characterized in that, The top cover plate (30) further includes a retaining ring (302), which is disposed on the top cover body (300). The inner wall of the retaining ring (302) forms at least a portion of the hole wall of the through hole (303). A convex ring (301) is disposed on the retaining ring (302), and the convex ring (301) is located on the side of the retaining ring (302) near the pressure ring (33) in the first direction (Z). A portion of the sealing ring (32) is located between the retaining ring (302) and the pole post (31) in the first direction (Z). The pressure ring (33) is welded to the convex ring (301).
3. The single-cell battery according to claim 2, characterized in that, The top cover assembly (3) further includes a first plastic (34) and a second plastic (35). The first plastic (34) is arranged in a ring and sleeved between the outer periphery of the pole post (31) and the inner periphery of the convex ring (301). The first plastic (34) abuts against at least one of the pressure ring (33), the convex ring (301) and the retaining ring (302). The second plastic (35) is arranged in a ring and sleeved on the outer periphery of the pole post (31). A portion of the second plastic (35) is located between the pole post (31) and the pressure ring (33). At least a portion of the pressure ring (33) and at least a portion of the convex ring (301) are located between the first plastic (34) and the second plastic (35).
4. The single-cell battery according to claim 2, characterized in that, A portion of the sealing ring (32) is located radially between the retaining ring (302) and the pole post (31) in the through hole (303); and / or, the top cover body (300), the convex ring (301) and the retaining ring (302) are integrally formed.
5. The single-cell battery according to claim 1, characterized in that, The pressure ring (33) has a first surface (331) in the first direction (Z), and the convex ring (301) has a second surface (301a) in the first direction (Z), the second surface (301a) being welded to the first surface (331).
6. The single-cell battery according to claim 1, characterized in that, One of the pressure ring (33) and the convex ring (301) is provided with a groove (a), the groove (a) is in a limiting fit with the other, and the pressure ring (33) and the convex ring (301) are welded to the groove (a); Alternatively, one of the pressure ring (33) and the convex ring (301) may have a groove (a) and the other may have a convex portion (b), wherein the convex portion (b) is in a limiting fit with the groove (a), and the pressure ring (33) and the convex ring (301) are welded to the convex portion (b).
7. The single-cell battery according to claim 1, characterized in that, The pressure ring (33) is provided with a first chamfered surface (332), and the convex ring (301) is provided with a second chamfered surface (301b). The second chamfered surface (301b) is adapted to and welded to the first chamfered surface (332).
8. The single-cell battery according to claim 7, characterized in that, The pressure ring (33) has a first surface (331) in the first direction (Z), the first surface (331) facing the convex ring (301), the convex ring (301) also has a support surface (301c), the support surface (301c) is connected to the second chamfered surface (301b), and the support surface (301c) is welded to a portion of the first surface (331).
9. The single-cell battery according to any one of claims 1 to 8, characterized in that, The single battery also includes a housing (1) and an electrode assembly (2). The housing (1) has a receiving cavity (10). The top cover (30) is connected to the housing (1) and covers the receiving cavity (10). The electrode assembly (2) is disposed in the receiving cavity (10). The electrode assembly (2) has a first tab (21) and a second tab (22). The through hole (303) has two holes, namely a first through hole (303a) and a second through hole (303b). The pole post (31) has two holes, namely a first pole post (31a) and a second pole post (31b). The first pole post (31a) passes through the first through hole (303a), and the second pole post (31b) passes through the second through hole (303b). The first pole post (31a) is electrically connected to the first electrode tab (21), and the second pole post (31b) is electrically connected to the second electrode tab (22).
10. A battery pack, characterized in that, Including the single cell battery as described in any one of claims 1-9.