Pole, cover plate, battery cell and battery pack

Abstract

The utility model relates to battery technical field discloses a kind of pole, cover plate, electric core and battery package, the pole of the utility model includes bottom plate and the pole portion of being arranged on bottom plate, and the side surface of pole portion towards cover plate outer side is equipped with strip boss. The two ends of strip boss length direction extend to the edge of the circumferential side wall of pole portion. Strip boss increases the material of pole portion length direction, can improve the material effect of both ends of pole portion length direction, so that both ends of pole portion length direction is fully material, so as to can improve the uniformity of material of pole portion circumferential everywhere, the connection reliability of pole and riveting block can be improved, so as to can guarantee the strength of cover plate;And the material of both ends of pole portion length direction is fully improved after, can make pole after riveting material and riveting block closely adhere, so as to can effectively guarantee the reliability of both welding, avoid false welding, can avoid battery internal resistance increase, guarantee battery internal resistance meet requirement.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a terminal post, a cover plate, a battery cell, and a battery pack. Background Technology

[0002] The cover plate using the pole post riveting fixing method includes a riveting block, a first insulating component, a cover plate body, a second insulating component, a pole post, and a sealing ring. The pole post includes a base plate and a post body. The pole post base plate and the riveting block clamp the cover plate components between them. The top of the post body is riveted to the riveting block, and the connection between the pole post and the riveting block is reinforced by laser welding.

[0003] Existing cylindrical electrode sections are generally cylindrical. However, for cells with narrow, elongated cover plates and high current carrying capacity, the narrow width of the cover plate itself prevents increasing the diameter of the cylindrical electrode section from improving its current carrying capacity. Therefore, the only solution is to increase the length of the electrode section, resulting in a narrow, elongated shape. This type of narrow, elongated electrode with a non-circular cross-section is prone to uneven material expansion during riveting, affecting the overall strength of the cover plate. It also leads to ineffective bonding between the electrode section and the riveting block after riveting, resulting in poor soldering and unstable internal resistance in the battery after laser welding. Utility Model Content

[0004] In view of this, the present invention provides a terminal post, a cover plate, a battery cell, and a battery pack to solve the problem in the prior art where the narrow and elongated cylindrical part of the terminal post causes uneven material expansion during riveting, which affects the strength of the cover plate.

[0005] In a first aspect, this utility model provides a pole post suitable for use in a cover plate. The cover plate includes a cover plate body and a riveting block. The cover plate body has mounting holes, and the riveting block has riveting holes. The pole post includes:

[0006] The base plate and a column portion disposed on the base plate, the base plate being adapted to be disposed on the inner side of one side surface of the cover plate body facing the inner side of the cover plate; the column portion being adapted to pass through mounting holes and riveting holes, the length of the column portion being greater than the width of the column portion, and along the length direction of the cross-section of the column portion, the column portion includes a smoothly extending smooth area and arc-shaped areas disposed at both ends of the smooth area, the sidewall of the column portion in the smooth area and the sidewall of the column portion in the arc-shaped area smoothly transitioning; a strip-shaped boss is provided on one side surface of the column portion facing the outer side of the cover plate, protruding along the thickness direction of the cover plate, the two ends of the strip-shaped boss extending in the length direction to the edge of the peripheral sidewall of the column portion, the width of the strip-shaped boss being less than the width of the column portion, and the strip-shaped boss being located in the middle region in the width direction of the column portion.

[0007] Beneficial effects: The pole of this structure has a strip-shaped protrusion on the side surface of the column body facing the outside of the cover plate. The two ends of the strip-shaped protrusion extend to the edge of the peripheral sidewall of the column body. The width of the strip-shaped protrusion is smaller than the width of the column body and the strip-shaped protrusion is located in the middle area of ​​the column body in the width direction. Compared with the side surface of the column body facing the outside of the cover plate being flat, the strip-shaped protrusion increases the material in the length direction of the column body. The terminal post, cover plate body, riveting block, and insulating components are assembled into a cover plate. During riveting, the riveting punch applies pressure outward from the middle area of ​​the side surface of the terminal post facing the outer side of the cover plate, causing material to expand. The strip-shaped boss and the terminal post are pressurized and flow outward in the circumferential direction of the terminal post. The terminal post is riveted to the riveting block. The strip-shaped boss increases the material in the length direction of the terminal post, which can improve the material expansion effect at both ends of the terminal post in the length direction. This allows the two ends of the terminal post in the length direction to fully expand outward, thereby improving the uniformity of material expansion in all parts of the circumference of the terminal post. This can improve the connection reliability between the terminal post and the riveting block, thus ensuring the strength of the cover plate. Furthermore, the increased material expansion at both ends of the terminal post in the length direction allows the terminal post and the riveting block to fit tightly after riveting, which can effectively ensure the reliability of the welded parts, avoid incomplete welding, prevent the increase of battery internal resistance, and ensure that the battery internal resistance meets the requirements.

[0008] In one alternative implementation, the arc-shaped area is a semicircular arc, the smooth area is rectangular, and the diameter of the semicircular arc is equal to the width of the smooth area.

[0009] In one alternative embodiment, the width of the side surface of the column portion facing the outside of the cover plate is T, and the width of the strip boss is t, where 35% ≤ t / T ≤ 75%.

[0010] Beneficial effects: t / T≥35% ensures the minimum width of the strip boss, thereby guaranteeing the width of the material at both ends of the column section along its length. This allows for sufficient material expansion at both ends of the column section, improving the strength of the cover plate and the fit between the column section and the rivet block. It also prevents incomplete welding and ensures the internal resistance of the battery. Meanwhile, t / T≤75% prevents the strip boss from being too wide, which could result in insufficient material expansion at both ends of the column section. This ensures sufficient material expansion at both ends of the column section along its length, further guaranteeing the material expansion effect.

[0011] In one alternative implementation, 40% ≤ t / T ≤ 60%.

[0012] In one alternative embodiment, along the thickness direction of the cover plate, the thickness of the strip boss protruding from the outer side surface of the column portion facing the cover plate is a, where 0.2mm≤a≤1mm.

[0013] In one optional embodiment, the length of the column portion is L, the width of the column portion is W, and 1 < L / W ≤ 4.

[0014] Secondly, this utility model also provides a cover plate, comprising:

[0015] The cover plate body is provided with mounting holes;

[0016] The rivet block has rivet holes and is located on the outer surface of the cover plate body facing the outer side of the cover plate.

[0017] In any one of the above-mentioned pole posts, the base plate is located on the inner side of the surface of the cover plate body facing the inner side of the cover plate; the post portion passes through the mounting hole and the riveting hole, the length of the post portion is greater than the width of the post portion, and before the pole post is riveted, a strip-shaped boss protruding along the thickness direction of the cover plate is provided on the outer side surface of the post portion, the two ends of the strip-shaped boss extending in the length direction to the edge of the peripheral sidewall of the post portion, the width of the strip-shaped boss is less than the width of the post portion, and the strip-shaped boss is located in the middle region in the width direction of the post portion. The cover plate includes the pole post and has the same technical effects as the pole post, which will not be described again here.

[0018] In one optional embodiment, the end of the column portion away from the base plate is riveted to the rivet block. Along the thickness direction of the cover plate, the thickness of the mounting platform at the riveting point between the column portion and the rivet block is h, and the thickness of the rivet block is H, where 1 / 3 ≤ h / H ≤ 2 / 3.

[0019] In a plane parallel to the plane where the rivet block is located, the width of the mounting platform at the rivet joint between the column and the rivet block is b, where 0.25mm≤b≤1mm.

[0020] Thirdly, this utility model also provides a battery cell, including a housing and a cover plate as described above, wherein the housing has an opening and the cover plate is disposed on the opening. The battery cell includes terminals, which have the same technical effects as the cover plate, and will not be described in detail here.

[0021] Fourthly, this utility model also provides a battery pack, including the aforementioned battery cells. The battery pack includes terminals, which have the same technical effects as the cover plate, and will not be described in detail here. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific 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.

[0023] Figure 1 This is a three-dimensional structural diagram of a pole post according to an embodiment of the present utility model (before the pole post is riveted);

[0024] Figure 2 for Figure 1 A top view of the pole shown;

[0025] Figure 3 for Figure 1 The side view of the pole shown;

[0026] Figure 4 for Figure 1 A top view of the pole shown;

[0027] Figure 5 This is a three-dimensional structural diagram of a cover plate according to an embodiment of the present utility model (before the pole post is riveted);

[0028] Figure 6 for Figure 5 The top view of the cover plate shown;

[0029] Figure 7 for Figure 6 Sectional view along axis AA;

[0030] Figure 8 for Figure 6 BB-direction sectional view;

[0031] Figure 9 for Figure 1 The diagram shows the pole post after riveting.

[0032] Figure 10 for Figure 9 The side view of the pole shown;

[0033] Figure 11 This is a three-dimensional structural diagram of a cover plate according to an embodiment of the present utility model (after the pole post is riveted);

[0034] Figure 12 for Figure 11 The top view of the cover plate shown;

[0035] Figure 13 for Figure 12 CC-direction sectional view.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Pole post; 11. Base plate; 12. Column body; 121. Smooth area; 122. Arc-shaped area; 123. Strip-shaped boss; 2. Cover plate body; 3. Riveting block; 4. First insulating component; 5. Second insulating component; 6. Sealing component. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments 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 protection scope of this utility model.

[0039] The cover plate using the pole post 1 for riveting and fixing includes a riveting block 3, a first insulating component 4, a cover plate body 2, a second insulating component 5, the pole post 1, and a sealing ring. The pole post 1 includes a base plate 11 and a cylindrical part 12. The cylindrical part 12 is generally cylindrical. For battery cells with a narrow and elongated cover plate that also require a large current carrying capacity, since the width of the cover plate body 2 is relatively narrow, it is not possible to increase the current carrying capacity of the battery cell by increasing the diameter of the cylindrical cylindrical part 12. Therefore, the size of the cylindrical part 12 can only be increased in the length direction of the cover plate body 2, thus forming a narrow and elongated cylindrical part 12. When riveting this non-circular cross-section pole 1, the riveting punch applies pressure outward from the middle area of ​​the pole body 12. Since the length of the pole body 12 is greater than its width, the two ends of the pole body 12 in the length direction do not expand outward enough, resulting in uneven expansion of the pole body 12 in all directions. This will affect the overall strength of the cover plate. At the same time, after the two ends of the pole body 12 expand, there is a gap between it and the riveting block 3. The pole body 12 cannot fit effectively with the riveting block 3. After laser welding the pole body 12 and the riveting block 3, the phenomenon of incomplete welding and unstable internal resistance is likely to occur.

[0040] The following is combined Figures 1 to 13 The following describes embodiments of the present invention.

[0041] According to an embodiment of the present invention, in one aspect, a pole post 1 is provided, suitable for use in a cover plate. The cover plate includes a cover plate body 2 and a riveting block 3. The cover plate body 2 is provided with mounting holes, and the riveting block 3 is provided with riveting holes. The pole post 1 includes a base plate 11 and a column portion 12 disposed on the base plate 11. The base plate 11 is adapted to be disposed on the inner side of the surface of the cover plate body 2 facing the inner side of the cover plate. The column portion 12 is adapted to pass through the mounting holes and the riveting holes. The length of the column portion 12 is greater than the width of the column portion 12. Along the length direction of the cross-section of the column portion 12, the column portion 12 encloses... The column portion 121 includes a smooth area 121 extending smoothly and an arc-shaped area 122 located at both ends of the smooth area 121. The side wall of the column portion 12 in the smooth area 121 and the side wall of the column portion 12 in the arc-shaped area 122 are smoothly connected. A strip-shaped boss 123 is provided on the side surface of the column portion 12 facing the outside of the cover plate. The two ends of the strip-shaped boss 123 extend to the edge of the peripheral side wall of the column portion 12 in the length direction. The width of the strip-shaped boss 123 is smaller than the width of the column portion 12, and the strip-shaped boss 123 is located in the middle region in the width direction of the column portion 12.

[0042] In this structure, the pole post 1 has a strip-shaped protrusion 123 on the side surface of the column portion 12 facing the outside of the cover plate. The two ends of the strip-shaped protrusion 123 extend to the edge of the peripheral side wall of the column portion 12 in the length direction. The width of the strip-shaped protrusion 123 is smaller than the width of the column portion 12 and the strip-shaped protrusion 123 is located in the middle region in the width direction of the column portion 12. Compared with the side surface of the column portion 12 facing the outside of the cover plate being flat, the strip-shaped protrusion 123 increases the material in the length direction of the column portion 12. The pole post 1, cover plate body 2, riveting block 3, and insulating components are assembled into a cover plate. During riveting, the riveting punch applies pressure outward from the middle area of ​​one side surface of the pole part 12 towards the outer side of the cover plate, causing material to expand. The strip boss 123 and the pole part 12 are pressurized and flow outward towards the circumferential outer side of the pole part 12. The pole part 12 is riveted to the riveting block 3. The strip boss 123 increases the material in the length direction of the pole part 12, which can improve the material expansion effect at both ends of the pole part 12 in the length direction, making the pole part 12... The material is fully expanded outward at both ends along the length direction, which can improve the uniformity of the material expansion in all directions of the column part 12, improve the connection reliability between the pole post 1 and the riveting block 3, and thus ensure the strength of the cover plate. Furthermore, after the material expansion at both ends along the length direction of the column part 12 is fully expanded, the column part 12 after riveting and expanding can be tightly fitted with the riveting block 3, which can effectively ensure the reliability of the two after welding, avoid false welding, avoid increasing the internal resistance of the battery, and ensure that the internal resistance of the battery meets the requirements.

[0043] Smooth extension of smooth region 121 refers to smooth region 121 having a small degree of curvature or extending in a straight line.

[0044] The arc-shaped area 122 is located at both ends of the smooth area 121. The side wall of the column portion 12 at the corresponding position of the arc-shaped area 122 is an arc surface. This arc surface smoothly transitions with the side wall of the column portion 12 at the corresponding position of the smooth area 121, so that the side wall of the column portion 12 at the corresponding position of the arc-shaped area 122 smoothly transitions with the side wall of the column portion 12 at the corresponding position of the smooth area 121. During the riveting process of the pole post 1, the column portion 12 is pressed by the riveting punch to expand the material for riveting. The riveting punch applies pressure from the middle area of ​​the column portion 12 outwards to expand the material. If the side of the column portion 12 has sharp edges, it is easy to cause uneven expansion of the material at the sharp edges of the column portion 12, which will affect the strength of the cover plate, and after laser welding the column portion 12 and the riveting block 3, it is easy to have a false weld and unstable internal resistance. The sidewall of the column portion 12 at the corresponding position of the arc-shaped area 122 smoothly transitions with the sidewall of the column portion 12 at the corresponding position of the smooth area 121. This ensures that the column portion 12 expands evenly in all circumferential positions during riveting, effectively improving the strength of the cover plate. It also ensures that the column portion 12 can effectively fit with the riveting block 3 in all circumferential positions. After laser welding the column portion 12 and the riveting block 3, the reliability of the welding can be guaranteed, ensuring the internal resistance and the stability of the battery operation.

[0045] In some alternative embodiments, such as Figures 1 to 4 As shown, the arc-shaped area 122 is a semi-circular arc, and the smooth area 121 is rectangular. The diameter of the semi-circular arc is equal to the width of the smooth area 121. That is, the cross-section of the column part 12 is racetrack-shaped, with a rectangular central region and semi-circular arc-shaped areas 122 at both ends of the central region. This ensures that the material expands evenly in all circumferential positions of the column part 12 during riveting, which can improve the strength of the cover plate. At the same time, it can also ensure the reliability of the welding between the column part 12 and the riveting block 3, thereby ensuring the internal resistance of the battery and the stability of battery operation.

[0046] In other embodiments, the smooth region 121 may also be an ellipse with openings at both ends of its major axis, and the arc-shaped region 122 may be a non-semi-circular shape with an arc shape in the circumference. The cross-section of the columnar portion 12 may also be elliptical.

[0047] In some embodiments, such as Figure 2As shown, the width of the surface of the column portion 12 facing the outside of the cover plate is T, and the width of the strip boss 123 is t, where 35% ≤ t / T ≤ 75%. If the width of the strip boss 123 is too small, the increase in material at both ends of the column portion 12 in the length direction will be small, and the material expansion effect at both ends of the column portion 12 in the length direction cannot be guaranteed. If the width of the column portion 12 is less than its length, the distance between the two sides of the column portion 12 in the width direction at the smooth area 121 and the force application point of the riveting punch is close when the material expands, and the expansion effect in this area is good, so there is no need to increase the material on both sides of the column portion 12 in the width direction at the smooth area 121. In addition, if the width of the strip boss 123 is too wide, when the width of the strip boss 123 is close to the width of the surface of the column portion 12 facing the outside of the cover plate, the surface of the column portion 12 facing the outside of the cover plate is close to a plane, and the increase in material in the length direction of the column portion 12 is not obvious, which is equivalent to no increase in the material in the length direction of the column portion 12. Therefore, t / T ≥ 35% ensures the minimum width of the strip boss 123, which in turn ensures the width of the material at both ends of the column portion 12 along its length. This allows for sufficient material expansion at both ends of the column portion 12, improving the strength of the cover plate and the fit between the column portion 12 and the riveting block 3. It also prevents incomplete welding and ensures the internal resistance of the battery. Meanwhile, t / T ≤ 75% prevents the strip boss 123 from being too wide, which would result in insufficient material expansion at both ends of the column portion 12 along its length. This ensures sufficient material expansion at both ends of the column portion 12 along its length, further guaranteeing the material expansion effect at both ends of the column portion 12 along its length.

[0048] Optionally, in some embodiments, 40% ≤ t / T ≤ 60%, which can further optimize the width of the strip boss 123, ensure sufficient material expansion at both ends of the column portion 12 in the length direction, improve the strength of the cover plate and the fit between the column portion 12 and the rivet block 3, prevent false welding and ensure the internal resistance of the battery.

[0049] In some embodiments, such as Figure 3 As shown, along the thickness direction of the cover plate, the thickness of the strip boss 123 protruding from the outer surface of the column portion 12 facing the cover plate is 'a', 0.2mm≤a≤1mm. 'a'≥0.2mm ensures the minimum thickness of the strip boss 123, thereby ensuring the increased material thickness on both sides of the outer surface of the column portion 12 along its length, improving the material expansion effect at both ends of the column portion 12. Simultaneously, 'a'≤1mm prevents the strip boss 123 from becoming too thick, avoiding the inability to flatten the strip boss 123 after riveting, and preventing the strip boss 123 from protruding from the outer surface of the riveting block 3 facing the cover plate.

[0050] In some embodiments, such as Figure 4As shown, the length of the column portion 12 is L, the width of the column portion 12 is W, and 1 < L / W ≤ 4. Figure 1 and Figure 8 As shown, the column portion 12 is provided with a support step. The cross-section of the column portion 12 located outside the support step is smaller than the cross-section of the column portion 12 located inside the support step. L and W are the length and width of the column portion 12 located inside the support step, respectively, and 1 < L / W ≤ 4. This prevents the column portion 12 from being too long and affecting its own strength, and ensures the upper limit of the length-to-width ratio of the column portion 12, thereby ensuring the strength of the column portion 12 and the pole 1. The shape of the riveting punch is adapted to the shape of the column portion 12, and 1 < L / W ≤ 4. This also prevents the riveting punch from being too long, and ensures the strength of the riveting punch, thereby ensuring the riveting effect of the riveting punch.

[0051] According to an embodiment of the present invention, another aspect is also provided: a cover plate, such as... Figures 5 to 8 , Figures 11 to 13 As shown, it includes a cover plate body 2, a riveting block 3, and a pole post 1 in the above embodiment.

[0052] The cover plate body 2 is provided with mounting holes; the riveting block 3 is provided with riveting holes and is located on the outer side surface of the cover plate body 2 facing the outer side of the cover plate; the base plate 11 of the pole post 1 is located on the inner side of the outer side surface of the cover plate body 2 facing the inner side of the cover plate; the column part 12 passes through the mounting holes and the riveting holes, the length of the column part 12 is greater than the width of the column part 12, before the pole post 1 is riveted, the outer side surface of the column part 12 is provided with a strip-shaped boss 123 protruding along the thickness direction of the cover plate, the two ends of the strip-shaped boss 123 in the length direction extend to the edge of the peripheral side wall of the column part 12, the width of the strip-shaped boss 123 is less than the width of the column part 12, and the strip-shaped boss 123 is located in the middle region in the width direction of the column part 12.

[0053] Figures 5 to 8 This is a schematic diagram of the front cover plate being riveted to pole post 1. Figures 11 to 13 This is a schematic diagram of the cover plate after the pole post 1 is riveted. Figure 9 and Figure 10 This is a schematic diagram of pole 1 after it has been riveted.

[0054] The cover plate of this structure has a strip-shaped protrusion 123 on the outer surface of the column portion 12. The strip-shaped protrusion 123 increases the material in the length direction of the column portion 12, which can improve the material expansion effect at both ends of the column portion 12 in the length direction. This allows the two ends of the column portion 12 to fully expand outward in the length direction, thereby improving the uniformity of material expansion in all circumferential directions of the column portion 12. This can improve the connection reliability between the electrode post 1 and the riveting block 3, thereby ensuring the strength of the cover plate. Furthermore, after the material expansion at both ends of the column portion 12 in the length direction is fully improved, the column portion 12 after riveting and expansion can be tightly fitted with the riveting block 3, thereby effectively ensuring the reliability of the two after welding, avoiding false welding, preventing the increase of battery internal resistance, and ensuring that the battery internal resistance meets the requirements.

[0055] like Figure 13 As shown, in some embodiments, the end of the column portion 12 away from the base plate 11 is riveted to the riveting block 3. Along the thickness direction of the cover plate, the thickness of the mounting platform at the riveting point between the column portion 12 and the riveting block 3 is h, and the thickness of the riveting block 3 is H. 1 / 3≤h / H≤2 / 3, h / H≥1 / 3. This setting can ensure the thickness of the mounting platform and the structural strength of the cover plate after it is formed. When the total thickness of the riveting block 3 is constant, h / H≤2 / 3. This can prevent the mounting platform from being too thick, which would cause the thickness of the riveting block 3 on the inner side of the mounting platform to be too thin. This can ensure the support strength of the riveting block 3 on the inner side of the mounting platform for the pole column 1.

[0056] In some embodiments, in a plane parallel to the plane where the rivet block 3 is located, the width of the mounting platform at the riveting point between the column portion 12 and the rivet block 3 is b, where 0.25mm ≤ b ≤ 1mm. b ≥ 0.25mm ensures the width of the mounting platform, allowing the column portion 12 to be stably held on the rivet block 3 after riveting. When the mounting platform width is too wide, it is difficult to ensure the consistency of the mounting platform width at all points around the column portion 12. To avoid this problem, b ≤ 1mm is used. This prevents the mounting platform width from being too wide, ensuring the consistency of the mounting platform width at all points around the column portion 12 after riveting, thereby ensuring the connection strength between the pole post 1 and the rivet block 3, and ensuring the overall strength of the cover plate after molding.

[0057] like Figure 8 As shown, in some embodiments, the cover plate further includes a first insulating member 4, a second insulating member 5, and a sealing member 6. The first insulating member 4 is disposed on the outer surface of the cover plate body 2; the riveting block 3 is disposed on the first insulating member 4; the second insulating member 5 is disposed on the inner surface of the cover plate body 2; the bottom plate 11 is disposed on the inner side of the inner surface of the second insulating member 5; the sealing member 6 is disposed between the cover plate body 2 and the pole post 1; the outer surface of the bottom plate 11 abuts against the sealing member 6; and the pole portion 12 passes through the second insulating member 5, the cover plate body 2, the first insulating member 4, and the riveting block 3 and is riveted to the riveting block 3.

[0058] The cover plate can be used for any battery cell with a narrow and long cover plate, such as blade cells and prismatic cells.

[0059] According to an embodiment of the present invention, another aspect provides a battery cell, including a housing and a cover plate as described in the above embodiment, wherein the housing has an opening and the cover plate is disposed on the opening.

[0060] In this cell structure, the strip-shaped protrusion 123 on the terminal post 1 increases the material along the length of the post 12, which improves the material expansion effect at both ends of the post 12 along its length. This allows the two ends of the post 12 to expand outwards sufficiently, thereby improving the uniformity of material expansion around the circumference of the post 12. This enhances the reliability of the connection between the terminal post 1 and the riveting block 3, thus ensuring the strength of the cover plate. Furthermore, the increased material expansion at both ends of the post 12 along its length allows the post 12 and the riveting block 3 to fit tightly together after riveting, effectively ensuring the reliability of the weld and preventing incomplete welding. This also prevents an increase in the battery's internal resistance and ensures that the battery's internal resistance meets the requirements.

[0061] In some optional embodiments, the battery cell includes a blade battery cell, which includes a housing with openings at both ends along its length. The cover plate includes a positive cover plate and a negative cover plate. A positive electrode post 1 is disposed on the positive cover plate, and a negative electrode post 1 is disposed on the negative cover plate. The positive cover plate and the negative cover plate are respectively disposed on the openings at both ends of the housing.

[0062] In other embodiments, the battery cell includes a prismatic battery cell, wherein the length of the cover body 2 of the prismatic battery cell is greater than its width.

[0063] According to an embodiment of the present invention, another aspect provides a battery pack including the aforementioned battery cell.

[0064] In this battery pack structure, the strip-shaped protrusions 123 on the cell terminal 1 increase the material along the length of the terminal 12, which improves the material expansion effect at both ends of the terminal 12 along its length. This allows the terminal 12 to expand outwards sufficiently, thereby improving the uniformity of material expansion around the circumference of the terminal 12. This enhances the reliability of the connection between the terminal 1 and the rivet block 3, thus ensuring the strength of the cover plate. Furthermore, the increased material expansion at both ends of the terminal 12 along its length allows the terminal 12 and the rivet block 3 to fit tightly together after riveting, effectively ensuring the reliability of the weld and preventing incomplete welds. This guarantees the overall strength and performance of the battery pack.

[0065] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An electrode post, characterized in that, Suitable for use in cover plates, the cover plate includes a cover plate body and a riveting block, the cover plate body is provided with mounting holes, and the riveting block is provided with riveting holes; the pole post includes: The base plate and a column portion disposed on the base plate, the base plate being adapted to be disposed on the inner side of one side surface of the cover plate body facing the inner side of the cover plate; the column portion being adapted to pass through mounting holes and riveting holes, the length of the column portion being greater than the width of the column portion, and along the length direction of the cross-section of the column portion, the column portion includes a smoothly extending smooth area and arc-shaped areas disposed at both ends of the smooth area, the sidewall of the column portion in the smooth area and the sidewall of the column portion in the arc-shaped area smoothly transitioning; a strip-shaped boss is provided on one side surface of the column portion facing the outer side of the cover plate, protruding along the thickness direction of the cover plate, the two ends of the strip-shaped boss extending in the length direction to the edge of the peripheral sidewall of the column portion, the width of the strip-shaped boss being less than the width of the column portion, and the strip-shaped boss being located in the middle region in the width direction of the column portion.

2. The pole post according to claim 1, characterized in that, The arc-shaped area is a semicircle, the smooth area is a rectangle, and the diameter of the semicircle is equal to the width of the smooth area.

3. The pole post according to claim 1 or 2, characterized in that, The width of the surface of the column portion facing the outside of the cover plate is T, and the width of the strip boss is t, where 35% ≤ t / T ≤ 75%.

4. The pole post according to claim 3, characterized in that, 40% ≤ t / T ≤ 60%.

5. The pole piece according to claim 1 or 2, characterized in that, Along the thickness direction of the cover plate, the thickness of the strip-shaped boss protruding from the outer side of the column portion of the cover plate is 'a', where 0.2mm ≤ a ≤ 1mm.

6. The pole post according to claim 1 or 2, characterized in that, The length of the column part is L, and the width of the column part is W, where 1 < L / W ≤ 4.

7. A cover plate, characterized in that, include: The cover plate body is provided with mounting holes; The rivet block has rivet holes and is located on the outer surface of the cover plate body facing the outer side of the cover plate. According to any one of claims 1 to 6, the base plate is located on the inner side of the side surface of the cover plate body facing the inner side of the cover plate; the column portion passes through the mounting hole and the riveting hole, the length of the column portion is greater than the width of the column portion, and before the pole post is riveted, a strip-shaped boss protruding along the thickness direction of the cover plate is provided on the side surface of the column portion facing the outer side of the cover plate, the two ends of the strip-shaped boss in the length direction extend to the edge of the peripheral sidewall of the column portion, the width of the strip-shaped boss is less than the width of the column portion, and the strip-shaped boss is located in the middle region in the width direction of the column portion.

8. The cover plate according to claim 7, characterized in that, The end of the column portion away from the base plate is riveted to the rivet block. Along the thickness direction of the cover plate, the thickness of the mounting platform at the riveting point between the column portion and the rivet block is h, and the thickness of the rivet block is H, where 1 / 3 ≤ h / H ≤ 2 / 3. In a plane parallel to the plane where the rivet block is located, the width of the mounting platform at the rivet joint between the column and the rivet block is b, where 0.25mm≤b≤1mm.

9. A battery cell, characterized in that, It includes a housing and a cover plate according to any one of claims 1 to 8, wherein the housing has an opening and the cover plate is disposed on the opening.

10. A battery pack, characterized in that, Includes the battery cell as described in claim 9.

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