Pole structure, cell cover plate and cell

Abstract

The utility model discloses lithium battery technical field provides a kind of pole structure, battery core cover plate and battery core, including pole base and pole body, pole body is integrally formed with the pole base, and extend along the thickness direction of pole base and protrude from pole base;Wherein, the end portion of pole body away from pole base is formed with annular pre-riveting part, pre-riveting hole is set up in pre-riveting part, and step surface is formed between pre-riveting part and pole body.The utility model is provided with pre-riveting part on the end portion of pole body, through the setting of pre-riveting part, material can flow uniformly when riveting, effectively solve the problem that material flows too much in width direction and exists gap etc.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to an electrode structure, a cell cover plate, and a cell. Background Technology

[0002] Lithium-ion batteries are widely used in various fields such as transportation power supply, power storage, new energy storage power supply, aerospace and military industry due to their advantages such as large capacity, high operating voltage, strong charge retention capability and long cycle life.

[0003] A battery cell is the smallest unit of a lithium battery pack, generally composed of electrode components, electrolyte, bare cell insulating sheet, cover plate, terminal structure, and casing. In related technologies, to address the high cost and difficulty of manufacturing dual-cylinder cells, a racetrack-shaped single-terminal structure is used as a replacement. However, in this technology, controlling material flow during assembly of the racetrack-shaped single-terminal structure is challenging. This often results in significant material expansion along the width of the riveting block at the terminal position, or gaps between the arc segment of the terminal and the riveting block, leading to pinholes, spalls, and pits in the weld during welding, severely impacting overall production yield. Utility Model Content

[0004] This utility model provides an electrode post structure, a cell cover plate, and a cell to solve the defects in the prior art where the racetrack-shaped single electrode post structure is prone to high difficulty in controlling material flow during riveting, and easily causes severe material expansion of the riveting block at the electrode post position along the width direction.

[0005] This utility model provides a pole post structure, including: a pole post base and a pole post body, wherein the pole post body is integrally formed with the pole post base and extends along the thickness direction of the pole post base and protrudes from the pole post base; wherein, an annular pre-riveting part is formed at the end of the pole post body away from the pole post base, a pre-riveting hole is provided in the pre-riveting part, and a stepped surface is formed between the pre-riveting part and the pole post body.

[0006] According to the pole post structure provided by this utility model, the pole post structure further includes a riveting block, the riveting block having a riveting hole in the thickness direction, and the pre-riveting part being located in the riveting hole.

[0007] According to the pole post structure provided by this utility model, the riveting hole is constructed as a stepped countersunk hole, and the step width in the stepped countersunk hole is 0.3mm≤W1≤0.4mm.

[0008] According to the pole post structure provided by this utility model, the pre-riveting part includes two opposing straight edge segments and two arc segments, each of the arc segments being connected between the two ends of the straight edge segments to form a racetrack-shaped pre-riveting part.

[0009] According to the pole structure provided by this utility model, along the circumference of the arc segment, its radial wall thickness gradually decreases from the middle to the two ends.

[0010] According to the pole structure provided by this utility model, the wall thickness of the straight edge section is 1.0mm≤T1≤1.5mm; the radial wall thickness of the arc section is 2.0mm≤T2≤3mm.

[0011] According to the pole structure provided by this utility model, the pole body is constructed in a racetrack shape. The extension length of the pole body in the length direction is 8mm≤L≤15mm, and the extension width of the pole body in the width direction is 4.0mm≤W2≤7mm, 0.4≤W / L≤0.65; and simultaneously satisfies 0.2≤T1 / W2≤0.25, 0.2≤T2 / L≤0.3, and 0.8≤(T1 / W2) / (T2 / L)≤1.2.

[0012] According to the pole post structure provided by this utility model, the depth of the pre-riveting hole in the thickness direction is 1.2mm≤H≤1.7mm.

[0013] This utility model also provides a cell cover plate, including the electrode post structure described in any of the above claims.

[0014] This utility model also provides a battery cell, including the terminal structure described in any of the above claims.

[0015] The present invention provides an electrode post structure, a cell cover plate, and a cell. The electrode post structure has a pre-riveting part on the end of the electrode post body. The pre-riveting part facilitates uniform material flow during riveting, effectively solving problems such as excessive material flow in the width direction and gaps. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the pole column structure provided by this utility model.

[0018] Figure 2 This is a top view schematic diagram of the pole structure provided by this utility model.

[0019] Figure 3 This is a schematic diagram of the riveting block in the pole structure provided by this utility model.

[0020] Figure 4 This is a schematic diagram of the structure of the battery cell cover plate provided by this utility model.

[0021] Figure label: 10. Pole post base; 20. Pole post body; 21. Stepped surface; 30. Pre-riveting part; 31. Straight edge section; 32. Arc section; 33. Pre-riveting hole; 40. Riveting plate; 41. Riveting hole; 50. Bright aluminum sheet; 60. Upper plastic; 70. Lower plastic. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of this utility model 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. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0025] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0026] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. 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. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0027] A battery cell is the smallest unit of a lithium battery pack, generally composed of electrode components, electrolyte, bare cell insulating sheets, cover plates, terminal structures, and a casing. The casing and cover plates are welded together to form a closed space housing the electrode components; the bare cell insulating sheets wrap around the electrode assembly, providing electrical insulation and protecting the electrode assembly from damage by the casing welds.

[0028] Currently, in order to improve the energy density of the entire battery pack, individual battery cells are gradually developing towards a "blade" structure, with a very small cell cross-section and a very narrow cover. At the same time, in order to meet the requirements of fast charging, the terminals need to have a large current-carrying cross-sectional area, which cannot be met by a single terminal. Thus, many blade battery cell covers currently use a double (multiple) circular terminal scheme. Adding terminal structures will increase the difficulty of manufacturing and will inevitably lead to a significant increase in production costs.

[0029] In related technologies, to reduce the difficulty and cost of manufacturing, racetrack-shaped single-pole structures are often used instead of the existing double circular poles (maintaining the same flow cross-sectional area). However, compared with circular pole cover plates, racetrack-shaped pole cover plates are difficult to control in terms of pole material expansion during assembly and riveting, especially the straight edge section and the arc section are difficult to balance. This can easily lead to severe material expansion of the riveting block at the pole position along the width direction after riveting, or gaps between the arc section of the pole and the riveting block, resulting in problems such as pinholes, craters, and pits in the weld during welding, seriously affecting the yield of cover plate production.

[0030] Regarding the problems in related technologies, such as Figure 1 , Figure 2 As shown, this embodiment provides a pole post structure, including a pole post base 10 and a pole post body 20. The pole post body 20 is integrally formed with the pole post base 10 and extends along the thickness direction of the pole post base 10 and protrudes from the pole post base 10. An annular pre-riveting portion 30 is formed at the end of the pole post body 20 away from the pole post base 10. A pre-riveting hole 33 is provided in the pre-riveting portion 30, and a stepped surface 21 is formed between the pre-riveting portion 30 and the pole post body 20. The pole post body and the riveting block need to be riveted and fixed to ensure a stable assembly structure. In this embodiment, by providing a pre-riveting portion 30 at the end of the pole post body and by setting a pre-anchor hole, the material flow during riveting can be optimized, effectively solving problems such as excessive material flow in the width direction and the existence of gaps.

[0031] Specifically, the pole post body 20, the pre-riveting part 30, and the pole post base 10 are integrally formed. A transitional stepped surface 21 is provided between the pole post body 20 and the pre-riveting part 30. The stepped surface 21 serves as a limiting surface when connected with the riveting block. The pre-riveting part 30 is a pre-designed preparation structure for subsequent press-fitting processes (e.g., press-fitting connection with the riveting block). The pre-riveting part 30 optimizes the material flow during subsequent press-fitting.

[0032] The pole post 20 is a solid column with a long, narrow track-like structure. The main body of the pole post 20 protrudes along its thickness from the surface of the pole post base 10. The radial dimension of the pre-riveting part 30 is smaller than that of the pole post 20, which causes the circumferential outer wall of the pre-riveting part 30 to be located inside the pole post 20, thus contracting inward to form a right-angled stepped surface 21. The stepped surface 21 serves as a limiting element, facilitating subsequent... (The text abruptly ends here, so the translation stops here as well.) Understandably, traditional pole post structures are integral columnar solid structures. In the riveting process, these structures are prone to excessive material expansion in the width direction of the pole post body under the action of the riveting equipment (the riveting head applies pressure to the workpiece, causing material flow, plastic deformation, and the formation of a strong connection point), exceeding the design dimensions. This embodiment, through the pre-riveting part 30 and the pre-riveting holes 33 on the pre-riveting part 30, ensures that the riveting force is evenly distributed outwards along the circumference of the riveting holes under the action of the riveting head. This avoids impacting the pole post body 20, meets the material flow requirements of the pole post body 20 along the length and width directions of the cover plate after riveting, and guarantees the strength of the riveted structure. Simultaneously, it avoids the problem of material expansion along the width direction of the riveting block at the pole post position after riveting, greatly improving the production yield of the finished product.

[0033] In conjunction with the above embodiments, the pole structure also includes a riveting block, which has a riveting hole 41 in the thickness direction, and a pre-riveting part 30 is located inside the riveting hole 41. During connection, the entire polarity needs to be connected to the riveting block. In this embodiment, the pre-riveting part 30 cooperates with the riveting hole 41 to ensure that the pole has a stable connection structure strength.

[0034] Specifically, the outer diameter of the pole post 20 is larger than the diameter of the riveting hole 41, while the outer diameter of the pre-riveting part 30 is smaller than the diameter of the riveting hole 41. This allows the stepped surface 21 to act as a limit, enabling the pre-riveting part 30, which protrudes from the end of the pole post 20, to extend into the riveting hole 41. The pre-riveting part 30, once inside the riveting hole 41, forms a flange structure under the press-riveting process, thereby achieving press-riveting connection with the riveting block.

[0035] It is understandable that the rivet block and the pole post 20 are fixedly connected by press riveting, which requires restricting the degree of freedom of the rivet block to achieve a stable connection of the pole post 20. In this embodiment, during connection, the axial direction of the pole post 20 (that is, the extension direction of the pole post 20) is first limited to the bottom of the rivet block by the stepped surface 21, and then the pre-riveting part 30 is press riveted to form an outward-facing flange structure by press riveting process, thereby achieving a stable connection of the pole post 20 to the rivet block.

[0036] In conjunction with the above embodiments, the riveting hole 41 is constructed as a stepped countersunk hole with different diameter sections, and the step width of the stepped countersunk hole is 0.3mm≤W1≤0.4mm. The stepped countersunk hole further provides axial limiting space, making the connection between the riveting block and the pole post 20 more stable.

[0037] Specifically, during the riveting process, the material in the pre-riveting section (the end of the pole post 20) is compressed and fills the countersunk hole. The step width constrains the axial flow distance of the material (≤0.4mm), preventing excessive deformation and cracking. Furthermore, the micro-steps with a step width of 0.3-0.4mm create a gradual transition, dispersing the stress generated by the riveting force and reducing the risk of stress concentration at the root. This guides the material to flow radially (rather than axially), forming a full riveting head structure and improving tensile strength.

[0038] Furthermore, the step width matches the deformation of the pre-riveted section to ensure a tight mechanical interlock after riveting, and the tiny step acts as a "mechanical stop" to suppress fretting wear caused by vibration during use and extend the connection life (especially suitable for high-frequency vibration environments of battery packs).

[0039] The 0.3mm step width limit ensures the minimum effective sealing width and the minimum material flow space, while the 0.4mm step width limit prevents excessive deformation that could lead to stress exceeding the limit.

[0040] In specific settings, the step width W1 of the stepped countersunk hole is 0.3mm, 0.35mm, or 0.4mm.

[0041] In conjunction with the above embodiments, the pre-riveting section 30 includes two opposing straight edge segments 31 and two arc segments 32. Each arc segment 32 connects the two ends of the straight edge segment 31 to form a racetrack-shaped pre-riveting section 30. The pre-riveting section 30 serves as a preparatory structure for the subsequent riveting process. Its main function is to optimize the material flow during the riveting process and to improve the overall fatigue strength of the pole post structure.

[0042] Specifically, the pre-riveted part 30 is composed of a straight edge section 31 and an arc section 32. During axial vibration, the straight edge section 31 disperses the longitudinal stress, and during torsional shear, the straight edge section 31 resists the transverse shear force, thereby effectively improving the fatigue strength of the pole structure.

[0043] Furthermore, the straight edge section 31 is in contact with the riveting hole 41 of the riveting plate 40 to constrain circumferential rotation, preventing the pre-riveting part 30 from shifting during riveting (an additional positioning pin is required for circular structures). The material flow direction in the area of ​​the straight edge section 31 can be predicted, which is beneficial to the control of material flow in the press riveting process. Combined with the stepped countersunk hole design of the riveting hole 41, the accuracy of riveting height tolerance control is higher.

[0044] In conjunction with the above embodiments, along the circumference of the arc segment 32, its radial wall thickness gradually decreases from the middle towards both ends. This gradual wall thickness design (e.g., thicker in the middle and thinner towards both ends) effectively solves the problems of riveting failure and sealing performance.

[0045] Understandably, during riveting, the deformation force is concentrated in the middle (apex) of the arc segment 32, where the stress is several times higher than at the ends, making it prone to microcracks. In this embodiment, by thickening the arc apex, the compressive section modulus can be increased, suppressing excessive concentration of plastic deformation, while the thinning at both ends can reduce stiffness and promote stress transmission to the straight edge segment 31.

[0046] Furthermore, it can regulate material flow and achieve precise control of the riveting morphology. During the specific riveting process, the thin-walled areas at both ends of the pre-riveting part 30 undergo preferential plastic deformation, filling the edges of the stepped countersunk hole. The thick-walled area in the middle (arc apex area) undergoes delayed deformation, forming a supporting skeleton, which facilitates the control of material flow. This avoids material accumulation and wrinkles, and results in smaller height fluctuations after riveting (≤±0.03mm) (meeting the flatness requirements of laser welding sealing).

[0047] In conjunction with the above embodiments, the wall thickness of the straight edge segment 31 is 1.0mm≤T1≤1.5mm; the radial wall thickness of the arc segment 32 is 2.0mm≤T2≤3mm.

[0048] Understandably, the thin-walled design of the straight-edge segment 31 enables preferential plastic deformation, constructs efficient force transmission, and improves shear strength. After deformation, the thin-walled area forms a mechanical interlocking structure with the riveting block, further enhancing shear strength. The increased thickness of the arc segment 32 prevents crushing deformation during assembly, thereby increasing the overall structural strength.

[0049] In the preferred examples, when T2 / T1 = 1.8~2.2 (e.g., T1 = 1.2 mm, T2 = 2.4 mm), the structural efficiency is optimal, and it can have higher structural strength.

[0050] In a specific implementation, the wall thickness T1 of the straight edge segment 31 is 1 mm, 1.2 mm, 1.3 mm or 1.5 mm; the radial wall thickness T2 of the arc segment 32 is 2 mm, 2.4 mm, 2.6 mm or 3 mm.

[0051] In conjunction with the above embodiments, the pole post 20 is constructed as a racetrack-shaped structure. The extension length of the pole post 20 in the length direction is 8mm≤L≤15mm, and the extension width of the pole post 20 in the width direction is 4.0mm≤W2≤7mm, 0.4≤W2 / L≤0.65; and simultaneously satisfies 0.2≤T1 / W2≤0.25, 0.2≤T2 / L≤0.3, and 0.8≤(T1 / W2) / (T2 / L)≤1.2. To ensure a stable connection between the pre-riveted part 30 and the pole post lifter in the manufacturing process, the aforementioned dimensional constraints ensure that after the cover plate is assembled and riveted, the pole post body 20 and the riveting block overlap well, with no gaps on the surface and a high welding yield; there are no gaps in the internal fit between the pole post body 20 and the riveting block, and the internal resistance of the pole post body 20 meets the design requirements; there is no significant material expansion of the pole post in the width direction of the cover plate, and the pole post width is qualified; there are no issues such as exceeding the standard in the length / width dimensions of the cover plate due to material expansion of the pole post, which greatly improves the production yield of the cover plate.

[0052] It is understandable that when the terminal post 20 is connected to the riveting block via a riveting process, a mismatch may occur between the dimensions of the terminal post 20 and the pre-riveted portion 30. This can lead to a significant decrease in the overall yield rate, and even riveting failure. In this embodiment, by limiting the extension length L of the terminal post 20 in the longitudinal direction, sufficient conductive cross-sectional area can be provided. By limiting the extension width W2 of the terminal post 20 in the width direction, it can be adapted to the standard battery module mounting spacing.

[0053] Furthermore, by limiting T1 / W2, it can achieve an optimal buckling safety factor SF=2.5; by limiting T2 / L, its thermal deformation angle θ<0.1°; and by limiting the stiffness ratio ((T1 / W2) / (T2 / L)), the mode shape can be distortion-free, thereby improving the fatigue life of vibration.

[0054] In a preferred embodiment, when L=10mm, W2=5.5mm, T1=1.2mm, and T2=2.4mm, W2 / L=0.55; T1 / W2=0.218, T2 / L=0.24; and the stiffness ratio is (0.218 / 0.24)=0.91. This results in a pull-out strength of 3.2kN and a leakage rate of <10⁻⁻⁶. 7 Pa·m³ / s.

[0055] In conjunction with the above embodiments, the depth of the pre-riveting hole 33 in the thickness direction is 1.2mm ≤ H ≤ 1.7mm. By limiting the depth of the pre-riveting hole 33, it is beneficial to accurately control the material flow.

[0056] Specifically, in the riveting process, the pre-riveting section mainly undergoes plastic deformation, with its depth matching the volume of the pre-riveting part 30, forming a composite deformation of radial expansion and axial upsetting. In this embodiment, by limiting its depth to greater than 1.2 mm, sufficient space can be provided to accommodate the material flow of the pre-riveting section, and limiting it to less than 1.7 mm can effectively limit excessive deformation that could lead to grain breakage.

[0057] In a specific implementation, the depth H of the pre-riveting hole 33 in the thickness direction is 1.2mm, 1.3mm, 1.5mm, 1.6mm or 1.7mm.

[0058] To verify the effectiveness of the specific solutions provided in the above embodiments, riveting verification was performed using different DOEs, and the results are shown in Table 1 below: As shown in Table 1, when the pole structure dimensions meet the above requirements, the pole and the rivet block overlap well after the cover plate is assembled and riveted, with no gaps on the surface and a high welding yield; there are no gaps in the internal fit between the pole and the rivet block, and the internal resistance of the pole meets the design requirements; there is no obvious material expansion of the pole in the width direction of the cover plate, and the pole width is qualified; there are no problems such as exceeding the standard due to material expansion of the pole in the length / width dimension of the cover plate. Conversely, when the radial wall thickness T2 value of the arc segment 32 is small, gaps are likely to occur between the pole and the rivet block after riveting, leading to appearance problems such as explosions and pits after laser welding, or serious material expansion of the straight edge of the rivet block, resulting in problems such as pole width exceeding the standard; when the W1 value is large, gaps are likely to occur between the pole and the rivet block after riveting, resulting in a large pole internal resistance; when the H value is small, the pole moves downwards during the riveting process, which can easily lead to pole deformation and problems such as exceeding the standard length / width dimension of the cover plate.

[0059] This utility model also provides a cell cover plate, including the electrode post structure provided in any of the above embodiments.

[0060] Specifically, the cell cover also includes an aluminum sheet 50, an upper plastic 60, and a lower plastic 70. The upper plastic 60 is located on the upper surface of the aluminum sheet 50, and the lower plastic 70 is located on the lower surface of the aluminum sheet 50. The upper plastic 60 has an installation groove, and the electrode post structure is located in the installation groove.

[0061] Furthermore, the cell cover plate provided in this example has the pole post structure of any of the aforementioned embodiments. Therefore, the cell cover plate in this embodiment has the characteristic effects of each of the aforementioned pole post structures. To avoid redundancy in the effect description, it will not be repeated here.

[0062] This utility model also provides a battery cell, including the terminal structure provided in any of the above embodiments.

[0063] Specifically, the battery cell provided in this example has the terminal structure of any of the aforementioned embodiments. Therefore, the battery cell in this embodiment has the characteristic effects of each of the aforementioned terminal structures. To avoid redundancy in the effect description, it will not be repeated here.

[0064] Through the above description of the embodiments, those skilled in the art can clearly understand the various embodiments.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A pole post structure, characterized in that, include: pole base; The pole post is integrally formed with the pole post base and extends along the thickness direction of the pole post base and protrudes from the pole post base. The end of the pole post body away from the pole post base has an annular pre-riveting part, and a pre-riveting hole is provided in the pre-riveting part. A stepped surface is formed between the pre-riveting part and the pole post body.

2. The pole post structure according to claim 1, characterized in that, The pole structure also includes a riveting block, which has a riveting hole in the thickness direction, and the pre-riveting part is located in the riveting hole.

3. The pole post structure according to claim 2, characterized in that, The rivet hole is constructed as a stepped countersunk hole, and the step width within the stepped countersunk hole is 0.3mm≤W1≤0.4mm.

4. The pole post structure according to claim 1, characterized in that, The pre-riveting section includes two opposing straight edge segments and two arc segments, with each arc segment connecting the two ends of the straight edge segment to form a racetrack-shaped pre-riveting section.

5. The pole post structure according to claim 4, characterized in that, Along the circumference of the arc segment, its radial wall thickness gradually decreases from the middle towards both ends.

6. The pole post structure according to claim 5, characterized in that, The wall thickness of the straight edge segment is 1.0mm≤T1≤1.5mm; the radial wall thickness of the arc segment is 2.0mm≤T2≤3mm.

7. The pole post structure according to claim 6, characterized in that, The pole post is constructed in a racetrack shape. The length of the pole post in the longitudinal direction is 8mm≤L≤15mm, and the width of the pole post in the width direction is 4.0mm≤W2≤7mm, 0.4≤W2 / L≤0.

65. And at the same time, it satisfies 0.2≤T1 / W2≤0.25, 0.2≤T2 / L≤0.3, and 0.8≤(T1 / W2) / (T2 / L)≤1.

2.

8. The pole post structure according to claim 1, characterized in that, The depth of the pre-riveting hole in the thickness direction is 1.2mm≤H≤1.7mm.

9. A battery cell cover plate, characterized in that, Includes the pole post structure as described in any one of claims 1 to 8.

10. A battery cell, characterized in that, Includes the pole post structure as described in any one of claims 1 to 8.

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