Pole assembly, cover plate, battery cell and electric device

Abstract

The application discloses a kind of pole assembly, cover plate, battery and electric equipment, including pole and conductive cap;The conductive cap is recessed and formed with mounting groove in the direction away from the pole;The pole includes column body and first flange, the first flange is connected around the column body, and the axial one end of the column body protrudes the first flange to form boss;The boss is inserted in the mounting groove, and electrically connected with the conductive cap;The oxidation resistance and conductivity of the conductive cap are both superior to the oxidation resistance and conductivity of the boss.In the present application, a conductive cap is provided on the boss, which can effectively prevent the boss from oxidizing.The present application can effectively prevent the surface of the pole assembly used for electrically connecting external elements from forming an oxide film, thereby reducing the contact resistance of the pole assembly and increasing the conductivity.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to an electrode assembly, a cover plate, a battery cell, and an electrical device. Background Technology

[0002] The current steel-cased battery casing mainly consists of a shell and a cover plate, which are welded together to form a sealed cavity. The cover plate includes a shell cap and terminals. The terminals mainly consist of a column and a flange that surrounds the outside of the column. The flange and the shell cap can be thermally bonded together with PP to achieve an insulating connection.

[0003] Additionally, a flange protrudes from one axial end of the post to form a boss, which is used for electrical connection to external components. The flange and / or the other axial end of the post are electrically connected to the tabs of the electrode core within the receiving cavity. However, in actual use, the boss of the post is exposed to air for extended periods, and an oxide film easily forms on its surface used for connecting external components. This oxide film has insulating properties, resulting in a high contact resistance of the post, which in turn adversely affects the charging and discharging efficiency of the battery cell. Summary of the Invention

[0004] The present invention provides a terminal assembly, a cover plate, a battery cell, and an electrical device, aiming to solve the problem that the bosses of existing terminals used to connect external components are exposed to the air, and their surfaces are prone to forming an oxide film, which leads to a large contact resistance.

[0005] The present invention provides an electrode assembly (10), the electrode assembly (10) includes an electrode (1) and a conductive cap (2); the conductive cap (2) has a recessed mounting groove (21) formed in a direction away from the electrode (1); the electrode (1) includes a column (11) and a first flange (12), the first flange (12) is connected to the column (11) around the column (11), and one axial end of the column (11) protrudes from the first flange (12) to form a boss (111); the boss (111) is inserted into the mounting groove (21) and electrically connected to the conductive cap (2); the antioxidant properties of the conductive cap (2) are better than those of the boss (111).

[0006] Optionally, along the axial direction of the column (11), at least one section of the mounting groove (21) is an anti-detachment groove (211), and at least one section of the pole (1) is an anti-detachment column (112); along the direction from the boss (111) to the flange, the inner diameter of the anti-detachment groove (211) gradually decreases, and the outer diameter of the anti-detachment column (112) gradually decreases; wherein, the anti-detachment column (112) is located inside the anti-detachment groove (211), and the radial side of the anti-detachment groove (211) and the radial side of the anti-detachment column (112) are in contact.

[0007] Optionally, the anti-detachment groove (211) extends from the bottom of the mounting groove (21) to the opening of the mounting groove (21), the anti-detachment post (112) extends from the end of the boss (111) away from the first flange (12) to the first flange (12), and the end face of the boss (111) away from the first flange (12) is attached to the bottom surface of the mounting groove (21); and / or, the inclination angle of the radial side of the anti-detachment groove (211) is A, wherein 70°≤A≤87°.

[0008] Optionally, the conductive cap (2) includes a cap body (22) and a second flange (23), and the mounting groove (21) is provided on the cap body (22); the second flange (23) is connected around the end of the cap body (22) near the first flange (12) and abuts against the first flange (12).

[0009] Optionally, the outer diameter of the cap body (22) gradually decreases along the direction from the second flange (23) to the first flange (12); the inclination angle of the radial outer side of the cap body (22) is B, where 70°≤B≤87°.

[0010] Optionally, both the conductive cap (2) and the boss (111) are made of existing metal materials; and / or, the boss (111) is riveted into the mounting groove (21); and / or, the conductive cap (2) abuts against the first flange (12).

[0011] Optionally, the pole (1) is an aluminum pole and the conductive cap (2) is a steel cap.

[0012] The outer surface of the conductive cap (2) is provided with a conductive protective layer. The antioxidant properties of the conductive protective layer are greater than those of the conductive cap (2), and the conductivity of the conductive protective layer is greater than that of the conductive cap (2). The thickness of the conductive protective layer is C, where 1um≤C≤3um. And / or, the conductive protective layer is any one of nickel layer, gold layer and silver layer.

[0013] Optionally, the conductive cap (2) has better conductivity than the boss (111).

[0014] The present invention provides a cover plate (100) including a shell cover (20), an insulating member (30), and a pole assembly (10) as described in any one of the above; the shell cover (20) is provided with a clearance hole (3); the clearance hole (3) penetrates the shell cover (20) along the axial direction of the pole body (11); the conductive cap (2) protrudes from the clearance hole (3); the insulating member (30) is disposed between the shell cover (20) and the pole assembly (10) to insulate the shell cover (20) and the pole assembly (10); the pole assembly (10) and the insulating member (30) cooperate to seal the clearance hole (3).

[0015] Optionally, the conductive cap (2) and the column (11) pass through the clearance hole (3); along the axial direction of the mounting groove (21), the insulating member (30) includes a first insulating part (4) and a second insulating part (5) that are in contact; the first insulating part (4) is located between the first flange (12) and the shell cover (20) and connects the first flange (12) and the shell cover (20); the second insulating part (5) is opposite to the clearance hole (3).

[0016] Optionally, the first insulating part (4) and the second insulating part (5) both surround the conductive cap (2); and / or, along the direction from the first insulating part (4) to the second insulating part (5), the surface of the second insulating part (5) away from the first flange (12) gradually moves away from the first flange (12); the side of the second insulating part (5) away from the first insulating part (4) extends into the clearance hole (3).

[0017] Optionally, the conductive cap (2) includes a cap body (22) and a second flange (23), and the mounting groove (21) is disposed on the cap body (22); the second flange (23) is connected around the end of the cap body (22) near the first flange (12) and surrounds the axis of the mounting groove (21); the outer diameter of the cap body (22) gradually decreases along the direction from the second flange (23) to the first flange (12); the second flange (23) abuts against the first flange (12) and is spaced apart from the second insulating part (5); the cover plate (100) also includes an insulating filler. (40) The insulating filler (40) is formed in the clearance hole (3) by potting glue; the insulating filler (40) includes a first filling part (6) and a second filling part (7); the first filling part (6) fills between the second flange (23) and the second insulating part (5) and connects the first flange (12), the second flange (23) and the second insulating part (5); the second filling part (7) fills between the cap body (22) and the shell cover (20) and connects the first filling part (6), the cap body (22) and the shell cover (20).

[0018] The present invention provides a battery cell, including the terminal assembly (10) as described in any one of the above claims or the cover plate (100) as described in any one of the above claims.

[0019] The present invention provides a battery cell, comprising a housing, an electrode core, and a cover plate (100) as described in any one of the above; the housing has a receiving cavity with an opening at one end, and the housing cover (20) closes the opening of the receiving cavity; wherein the electrode core is disposed in the receiving cavity and is electrically connected to the electrode post (1); the first flange (12) is located in the receiving cavity and between the conductive cap (2) and the electrode core.

[0020] The present invention provides an electrical device, characterized in that it includes a battery cell as described above.

[0021] In the electrode assembly, cover plate, battery cell, and electrical device provided by this invention, when the electrode assembly is applied to the battery cell, the end of its first flange and / or column facing away from the boss is used for electrical connection to the electrode tab of the core, and the conductive cap can be used for electrical connection to external components. Furthermore, covering the boss with a conductive cap can effectively prevent the boss from oxidizing. Moreover, the conductive cap has better oxidation resistance than the boss; compared to the boss, the conductive cap is less prone to oxidation. Therefore, the design of this invention can effectively prevent the formation of an oxide film on the surface of the electrode assembly used for electrical connection to external components (i.e., the surface of the conductive cap), thereby reducing the contact resistance of the electrode assembly and improving conductivity. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a cross-sectional view of the pole assembly provided by the present invention; Figure 2 This is a cross-sectional view of the pole provided by the present invention; Figure 3 This is a cross-sectional view of the conductive cap provided by the present invention; Figure 4 This is a schematic diagram of the structure of the cover plate provided by the present invention; Figure 5 yes Figure 4 Cross-sectional view along the MM direction; Figure 6 This is a cross-sectional view of the cover plate provided by the present invention when an insulating filler is provided; Figure 7 yes Figure 6 A magnified view of region N in the middle.

[0024] Instruction manual illustrations and reference numerals: 100. Cover plate; 10. Terminal post assembly; 20. Housing cover; 30. Insulating component; 40. Insulating filler; 1. Pole post; 11. Post body; 111. Boss; 112. Anti-detachment post; 12. First flange; 2. Conductive cap; 21. Mounting groove; 211. Anti-detachment groove; 22. Cap body; 23. Second flange; 3. Clearance hole; 4. First insulation part; 5. Second insulation part; 6. First filling section; 7. Second filling section. Detailed Implementation

[0025] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0026] In the description of this invention, it should be understood that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0028] like Figures 1 to 3 As shown, this embodiment of the invention provides an electrode assembly 10, which includes an electrode 1 and a conductive cap 2. The conductive cap 2 is recessed in a direction away from the electrode 1 to form a mounting groove 21. The electrode 1 includes a column body 11 and a first flange 12, which is connected to the column body 11 around the column body 11. One axial end of the column body 11 protrudes from the first flange 12 to form a boss 111. The boss 111 is inserted into the mounting groove 21 and electrically connected to the conductive cap 2. The antioxidant properties of the conductive cap 2 are better than those of the boss 111.

[0029] exist Figure 1 In the direction shown, the axial direction of column 1 is parallel to the Z-axis.

[0030] When the electrode assembly 10 is applied to the battery cell, the end of its first flange 12 and / or column 11 facing away from the boss 111 is used for electrical connection to the electrode tab of the battery cell, and the conductive cap 2 can be used for electrical connection to external components. The external component is a conductive element independent of the battery cell, and the battery cell can supply power to the external component from the conductive cap 2, or the battery cell can receive charging from the external component from the conductive cap 2.

[0031] Compared to the existing technology where the boss is exposed and electrically connected to external components, this embodiment covers the boss 111 with a conductive cap 2, which effectively prevents the boss 111 from oxidizing. Furthermore, the conductive cap 2 has better oxidation resistance than the boss 111; it is less prone to oxidation. Therefore, compared to directly exposing the boss 111 for electrical connection to external components, this embodiment effectively prevents the formation of an oxide film on the surface of the terminal assembly 10 used for electrical connection to external components (i.e., the surface of the conductive cap 2), thereby reducing the contact resistance of the terminal assembly 10. Even after prolonged use, this embodiment maintains good conductivity, thus preventing adverse effects on the charging and discharging efficiency of the battery cell due to oxidation.

[0032] In addition, it should be noted that both the conductive cap 2 and the boss 111 are made of existing conductive materials.

[0033] In one embodiment, both the conductive cap 2 and the boss 111 are made of existing metal materials, which allows both to have good electrical conductivity.

[0034] Normally, the material of the boss 111 is the same as the material of the pole post 1.

[0035] In one embodiment, the conductive cap 2 is a stainless steel cap, and the electrode post 1 is an aluminum post. In this case, the boss 111, the first flange 12, and other areas of the post body 11 are all aluminum structures. This configuration can reduce material costs while ensuring that the electrode post assembly 10 has good conductivity. In addition, compared with aluminum posts, stainless steel caps also have better resistance to acid and alkali corrosion, which is more conducive to maintaining good conductivity of the electrode post assembly 10.

[0036] Specifically, the stainless steel cap can be made of 316L stainless steel or other types of steel; the aluminum post can be made of 3003 aluminum or 1060 aluminum, or aluminum alloy, etc. In some scenarios, the aluminum post 1 can adopt an existing design. In this case, the setting in this embodiment is equivalent to covering the existing aluminum post 1 with a conductive cap 2.

[0037] It should be understood that stainless steel has weaker electrical conductivity than aluminum. However, after aluminum is oxidized, its electrical conductivity becomes weaker than that of stainless steel.

[0038] like Figure 2 and Figure 3 As shown, in one embodiment, along the axial direction of the column 11, at least one section of the mounting groove 21 is an anti-detachment groove 211 and at least one section of the pole post 1 is an anti-detachment post 112; along the direction from the boss 111 to the flange, the inner diameter of the anti-detachment groove 211 gradually decreases and the outer diameter of the anti-detachment post 112 gradually decreases; wherein, the anti-detachment post 112 is located inside the anti-detachment groove 211, and the radial side of the anti-detachment groove 211 and the radial side of the anti-detachment post 112 are in contact.

[0039] This can improve the connection strength between the conductive cap 2 and the boss 111, and effectively prevent the conductive cap 2 and the boss 111 from separating.

[0040] Among them, the part of the conductive cap 2 with the anti-detachment groove 211 is a closed-loop structure, and the cross-section of this part of the structure is annular, such as a circular ring.

[0041] In one embodiment, the mounting groove 21 has a circular cross-section, and the boss 111 can also have a circular cross-section. The anti-detachment groove 211 can be a frustum-shaped hole, and the anti-detachment column 112 can be a frustum-shaped structure. After assembly, the anti-detachment groove 211 and the anti-detachment column 112 are coaxial.

[0042] In one embodiment, the anti-detachment groove 211 extends from the bottom of the mounting groove 21 to the opening of the mounting groove 21, and the anti-detachment post 112 extends from the end of the boss 111 away from the first flange 12 to the first flange 12, with the end face of the boss 111 away from the first flange 12 fitting against the bottom surface of the mounting groove 21. This can improve the current transmission performance between the boss 111 and the conductive cap 2.

[0043] The direction from the bottom surface of the mounting groove 21 to the opening of the mounting groove 21 can be parallel to the axial direction of the column 11.

[0044] Along the axial direction of the column 11, the end face of the boss 111 furthest from the first flange 12 is defined as the top surface of the column 11; along the axial direction of the column 11, the end face of the conductive cap 2 facing away from the column 11 is positioned as the connecting surface of the conductive cap 2. In practical scenarios, the connecting surface of the conductive cap 2 is used for electrical connection of external components. Setting the top surface of the column 11 to fit against the bottom surface of the mounting groove 21 allows current to be transmitted more smoothly to the connecting surface of the conductive cap 2.

[0045] In one embodiment, the inclination angle of the radial side of the anti-detachment groove 211 is A, where 70°≤A≤87°. This ensures the connection strength between the boss 111 and the conductive cap 2, and also facilitates the production and preparation of the conductive cap 2.

[0046] Wherein, A can refer to the included angle between the radial side of the anti-detachment groove 211 and the bottom surface of the column 1, wherein the mounting groove 11 forms an opening on the bottom surface of the conductive cap 2, and the bottom surface of the conductive cap 2 can refer to the bottom surface of the cap body 22 in the following text.

[0047] In addition, the value of A can be 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84°, 85°, 86° or 87°.

[0048] In one embodiment, the boss 111 is riveted into the mounting groove 21. This allows for a fixed connection between the pole 1 and the conductive cap 2 without the need for welding. However, when the conductive cap 2 is welded to the boss 111, solder marks remain on the conductive cap 2, causing an uneven surface. This unevenness negatively impacts the reliability of subsequent connections to external components. Furthermore, contact with the solder marks by external components increases contact resistance. This embodiment eliminates the need for welding the conductive cap 2, thus avoiding these problems.

[0049] Specifically, in actual production, the boss 111 and the conductive cap 2 can be riveted together using a riveting process.

[0050] In one embodiment, the boss 111 fills the mounting groove 21, thereby improving the conductivity between the boss 111 and the conductive cap 2.

[0051] In one embodiment, the first flange 12 is an annular structure. The end face of the other end of the column 11 along its axial direction (i.e., the end facing away from the boss 111) is the bottom surface of the column 11, which can be a plane. Along the axial direction of the column 11, the surface of the first flange 12 facing away from the boss 111 is the bottom surface of the first flange 12, which can also be a plane. The bottom surfaces of the column 11 and the first flange 12 can be flush, in which case they lie in the same plane.

[0052] Additionally, along the axial direction of the column 11, the surface of the first flange 12 near the boss 111 is the top surface of the first flange 12, and the top surface of the first flange 12 can be a plane. The shape of the top surface of the first flange 12 is the same as the shape of its cross-section.

[0053] like Figure 1 and Figure 7As shown, in one embodiment, the conductive cap 2 abuts against the first flange 12. This not only makes the connection between the conductive cap 2 and the pole 1 more secure, but also allows the conductive cap 2 to shield the junction area between the boss 111 and the first flange 12, effectively preventing oxidation in that area.

[0054] like Figure 1 and Figure 3 As shown, in one embodiment, the conductive cap 2 includes a cap body 22 and a second flange 23, with a mounting groove 21 disposed in the cap body 22; the second flange 23 is circumferentially connected to the end of the cap body 22 near the first flange 12. This allows the conductive cap 2 to have greater strength.

[0055] In addition, the mounting groove 21 is a blind hole structure, and its cross-section can be circular. The second flange 23 surrounds the axis of the mounting groove 21.

[0056] After assembly, the second flange 23 surrounds the boss 111.

[0057] like Figure 3 As shown, along the axial direction of the column 11, the thickness of the cap 22 is greater than the thickness of the second flange 23. Moreover, along the direction from the first flange 12 to the second flange 23 (which is parallel to the axial direction of the column 11), the cap 22 protrudes from the second flange 23.

[0058] The end face of the cap body 22 away from the first flange 12 is the connection surface of the conductive cap 2.

[0059] Furthermore, the end face of the cap 22 closest to the first flange 12 is the bottom face of the cap 22, and the bottom face of the cap 22 can be a plane. Similarly, the end face of the second flange 23 closest to the first flange 12 is the bottom face of the second flange 23, and the bottom face of the second flange 23 can also be a plane. The bottom faces of the cap 22 and the second flange 23 can be flush, in which case they lie in the same plane.

[0060] In addition, the shape of the edge of the cross section of the second flange 23 can be circular, in which case the second flange 23 can be annular.

[0061] In an actual product, the inner sidewall of the mounting groove 21 (i.e., the radial sidewall of the conductive cap 2) near its opening is chamfered (or rounded) to avoid stress concentration. Of course, chamfered or rounded corners can also be provided at the corresponding corners of other structures in the pole assembly 10 to avoid stress concentration.

[0062] like Figure 1 and Figure 7As shown, in one embodiment, the second flange 23 abuts against the first flange 12, at which point the bottom surface of the second flange 23 and the top surface of the first flange 12 can fit together. This allows the conductive cap 2 to provide greater protection for the electrode post 1.

[0063] like Figure 3 and Figure 7 As shown, in one embodiment, the outer diameter of the cap 22 gradually decreases along the direction from the second flange 23 to the first flange 12, and the radially outer surface of the cap 22 is inclined inward. This helps to reduce material costs.

[0064] The direction from the second flange 23 to the first flange 12 is the direction from the opening of the mounting groove 21 to the bottom surface of the mounting groove 21, and this direction is parallel to the Z-axis.

[0065] The cross-sectional shape of the area where the conductive cap 2 has the mounting groove 21 can be annular.

[0066] Alternatively, the cap body 22 and the second flange 23 can be integrally formed. In this case, the conductive cap 2 is integrally formed, which facilitates the production and preparation of the conductive cap 2. For example, the conductive cap 2 can be formed from a metal sheet through a stamping process. Of course, in other scenarios, the conductive cap 2 can also be integrally formed by casting or other methods.

[0067] like Figure 3 As shown, in one embodiment, the inclination angle of the radially outer surface of the cap body 22 is B, where 70°≤B≤85°. This ensures the strength of the cap body 22 and also facilitates its production.

[0068] The value of B can be 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84°, 85°, 86° or 87°.

[0069] In addition, the tilt angle B of the radial outer surface of the cap body 22 can be regarded as the angle between the radial outer surface of the cap body 22 and the bottom surface of the cap body 22.

[0070] In one embodiment, the outer surface of the conductive cap 2 is provided with a conductive protective layer, and the antioxidant properties of the conductive protective layer are superior to those of the conductive cap 2. This further improves the antioxidant properties of the conductive cap 2.

[0071] In addition, the conductivity of the conductive protective layer is better than that of the conductive cap 2, which can further reduce the resistance of the pole assembly 10.

[0072] Moreover, the acid and alkali corrosion resistance of the conductive protective layer can be better than that of the conductive cap 2, so as to better maintain the good conductivity of the pole assembly 10.

[0073] The conductive protective layer is made of existing conductive materials, such as any one of nickel, gold, and silver.

[0074] Taking nickel as the conductive protective layer as an example, when no conductive protective layer is set, the contact resistance is measured by using a test probe to touch the stainless steel surface. The measured resistance value is approximately 200mΩ. When a nickel layer is set on the outer surface of the stainless steel cap, the measured resistance value of the nickel-plated stainless steel surface is approximately 60mΩ.

[0075] In addition, in actual production, the conductive protective layer can be formed on the conductive cap 2 through processes such as electroplating.

[0076] It should be understood that the outer surface of the conductive cap 2 includes: the connecting surface of the conductive cap 2, the radial side surface of the cap body 22, the bottom surface of the cap body 22, the top surface of the second flange 23, the bottom surface of the second flange 23, and the radial side surface of the second flange 23. The top surface of the second flange 23 refers to the surface of the second flange 23 facing away from the first flange 12 along the axial direction of the column 11. The top surface of the second flange 23 is spaced apart from the connecting surface of the conductive cap 2.

[0077] The outer surface of the conductive cap 2 can be completely covered by the conductive protective layer. Alternatively, only a portion of the outer surface of the conductive cap 2 can be covered by the conductive protective layer, for example, only the connecting surface of the conductive cap 2, the radial side of the cap body 22, the top surface of the second flange 23, and the radial side of the second flange 23 are covered by the conductive protective layer.

[0078] In one embodiment, the thickness of the conductive protective layer is C, where 1µm ≤ C ≤ 3µm. This ensures the protective effect of the conductive protective layer while avoiding material waste.

[0079] Where C can be the maximum thickness, minimum thickness, or average thickness of the electrical protection layer.

[0080] When the connecting surface of the conductive cap 2 is covered with a conductive protective layer, the thickness of this conductive protective layer can refer to its maximum thickness, minimum thickness, or average thickness in the Z-axis direction. Furthermore, the thickness of this conductive protective layer is also C.

[0081] When the bottom surface of the cap 22 is covered with a conductive protective layer, the thickness of this conductive protective layer can refer to its maximum thickness, minimum thickness, or average thickness in the Z-axis direction. Furthermore, the thickness of this conductive protective layer is also C.

[0082] When the radially outer surface of the cap 22 is covered with a conductive protective layer, the thickness of this conductive protective layer can refer to its maximum thickness, minimum thickness, or average thickness in the radial direction of the cap 22. Furthermore, the thickness of this conductive protective layer is also C.

[0083] When the top surface of the second flange 23 is covered with a conductive protective layer, the thickness of this conductive protective layer can refer to its maximum thickness, minimum thickness, or average thickness in the Z-axis direction. Furthermore, the thickness of this conductive protective layer is also C.

[0084] When the bottom surface of the second flange 23 is covered with a conductive protective layer, the thickness of this conductive protective layer can refer to its maximum thickness, minimum thickness, or average thickness in the Z-axis direction. Furthermore, the thickness of this conductive protective layer is also C.

[0085] When the radial outer surface of the second flange 23 is covered with a conductive protective layer, the thickness of this conductive protective layer can refer to its maximum thickness, minimum thickness, or average thickness in the radial direction of the second flange 23. Furthermore, the thickness of this conductive protective layer is also C.

[0086] In addition, the value of C can be 1um, 1.2um, 1.5um, 1.8um, 2um, 2.2um, 2.5um, 2.8um or 3um.

[0087] like Figure 4 and Figure 5 As shown, this embodiment of the invention also provides a cover plate 100, which includes a shell cover 20, an insulating member 30, and an electrode assembly 10 as described in any of the above embodiments; the shell cover 20 is provided with a clearance hole 3; the clearance hole 3 penetrates the shell cover 20 along the axial direction of the column 11; the conductive cap 2 protrudes from the clearance hole 3; the insulating member 30 is disposed between the shell cover 20 and the electrode assembly 10 to insulate the shell cover 20 and the electrode assembly 10; the electrode assembly 10 and the insulating member 30 cooperate to seal the clearance hole 3.

[0088] The conductive cap 2 protruding from the clearance hole 3 can mean that the projection of the conductive cap 2 in the orthographic projection of a plane perpendicular to the axis of the column 11 coincides with the projection of the clearance hole 3. Specifically, the conductive cap 2 may be inserted into the clearance hole 3; or, the conductive cap 2 may not be inserted into the clearance hole 3, but the conductive cap 2 may be located on the side of the first flange 12 near the shell cover 20.

[0089] Additionally, the insulating element 30 is typically positioned between the first flange 12 and the housing cover 20. The housing cover 20 can be made of metal, such as a stainless steel cover.

[0090] In one embodiment, the flange is bonded to the cover 20 by an insulating element 30. In this case, the insulating element 30 may be a film.

[0091] like Figure 5 and Figure 6 As shown, in one embodiment, the conductive cap 2 is inserted into the clearance hole 3, which facilitates the connection of the conductive cap 2 to external components and also helps to reduce the thickness of the cover plate 100.

[0092] In addition, when the conductive cap 2 is inserted into the clearance hole 3, the conductive cap 2 and the hole wall (i.e., the shell cover 20) of the clearance hole 3 are spaced apart.

[0093] The clearance hole 3 can be a round hole, in which case the diameter of the clearance hole 3 is larger than the outer diameter of the conductive cap 2. Of course, the clearance hole 3 can also be a square hole or a hole of other shapes.

[0094] like Figure 5 and Figure 6 As shown, in one embodiment, a conductive cap 22 protrudes from the housing cover 20 along the direction from the first flange 12 to the second flange 23 (this direction is parallel to the Z-axis), which facilitates its electrical connection with external components.

[0095] like Figure 5 and Figure 7 As shown, in one embodiment, along the axial direction of the mounting groove 21, the insulating member 30 includes a first insulating portion 4 and a second insulating portion 5 that are in contact; the first insulating portion 4 is located between the first flange 12 and the housing cover 20, and connects the first flange 12 and the housing cover 20; the second insulating portion 5 is opposite to the clearance hole 3. This can improve the insulation effect between the pole assembly 10 and the housing cover 20.

[0096] The second insulating part 5 being opposite to the clearance hole 3 can mean that in the orthographic projection of a plane perpendicular to the axis of the column 11, the projection of the second insulating part 5 coincides with the projection of the clearance hole 3.

[0097] Furthermore, along the direction from the second insulating portion 5 to the first insulating portion 4 (which can be radially parallel to the column 11), the first insulating portion 4 protrudes from the first flange 12, which can also improve the insulation effect between the pole assembly 10 and the housing cover 20. Moreover, the portion of the first insulating portion 4 that protrudes from the first flange 12 can be a closed-loop structure and surround the second insulating portion 5.

[0098] In one embodiment, both the first insulating portion 4 and the second insulating portion 5 are annular and surround the conductive cap 2. Specifically, the first insulating portion 4 surrounds the second insulating portion 5. This improves the insulation effect between the electrode assembly 10 and the housing 20.

[0099] Furthermore, the first insulating part 4 and the second insulating part 5 can both be coaxial, and both can be annular in shape. The outer diameter of the first insulating part 4 is larger than the outer diameter of the first flange 12, the inner diameter of the first flange 12 can be equal to the diameter of the clearance hole 3, and the inner diameter of the second insulating part 5 can be greater than or equal to the outer diameter of the second flange 23.

[0100] After assembly, the first flange 12 and the first insulating part 4 can be coaxial, and the second flange 23 and the second insulating part 5 can be coaxial.

[0101] like Figure 7 As shown, in one embodiment, along the direction from the first insulating part 4 to the second insulating part 5 (i.e., along the direction from the outside to the inside), the surface of the second insulating part 5 facing away from the first flange 12 (this surface is the top surface of the second insulating part 5) gradually moves away from the first flange 12, that is, the top surface of the second insulating part 5 is an inclined surface facing away from the first flange 12; the side of the second insulating part 5 away from the first insulating part 4 extends into the clearance hole 3. This more effectively avoids short circuit between the conductive cap 2 and the shell cover 20.

[0102] The first insulating part 4 and the second insulating part 5 are both connected to the first flange 12. Along the direction from the outside to the inside, the top surface of the second insulating part 5 gradually moves away from the first flange 12. Therefore, along the direction from the outside to the inside, the thickness of the second insulating part 5 gradually increases.

[0103] In addition, the top surface of the second insulating part 5 can be a flat surface or an arc-shaped surface.

[0104] like Figure 6 and Figure 7 As shown, in one embodiment, the cover plate 100 further includes an insulating filler 40, which fills the clearance hole 3. The insulating filler 40 can improve the insulation effect between the pole assembly 10 and the cover 20.

[0105] When the second flange 23 abuts against the first flange 12 and the second flange 23 is spaced apart from the second insulating part 5, the insulating filler 40 includes a first filling part 6 and a second filling part 7; wherein, the first filling part 6 fills between the second flange 23 and the second insulating part 5 and connects the first flange 12, the second flange 23 and the second insulating part 5; the second filling part 7 fills between the cap body 22 and the shell cover 20 and connects the first filling part 6, the cap body 22 and the shell cover 20.

[0106] By connecting the conductive cap 2, the pole 1, and the shell cover 20 with the insulating filler 40, the connection strength of the three can be improved. In addition, the insulating filler 40 can also seal the gap between the conductive cap 2 and the pole 1 (mainly the second flange 23 and the first flange 12), preventing air from entering the gap between them. In this way, the cooperation between the conductive cap 2 and the insulating filler 40 can achieve more comprehensive shielding and protection for the boss 111, thereby more effectively preventing oxidation of the surface of the boss 111.

[0107] In addition, the first flange 12 can be shielded and protected by the cooperation of the conductive cap 2, the shell cover 20, the insulating part 30 and the insulating filler 40, thereby avoiding oxidation of the surface of the first flange 12, which can also improve the conductivity of the pole 1.

[0108] When the top surface of the second insulating part 5 is an inclined surface that is away from the first flange 12, the contact area between it and the insulating filler 40 can be increased, thereby improving the connection strength between the two.

[0109] It should be noted that both the first filling portion 6 and the second filling portion 7 are annular structures. Along the axial direction of the column 11, the second filling portion 7 is connected to the side of the first filling portion 6 opposite to the first flange 12. Furthermore, along the radial direction of the column 11 and in the direction from the conductive cap 2 to the shell cover 20, the second filling portion 7 has a first protrusion protruding from the first filling portion 6; and along the radial direction of the column 11 and in the direction from the shell cover 20 to the conductive cap 2, the second filling portion 7 has a second protrusion protruding from the first filling portion 6. Both the first and second protrusions are annular structures surrounding the conductive cap 2.

[0110] The first filling part 6 connects the top surface of the first flange 12, the radial outer side of the second flange 23, and the radial inner side of the second insulating part 5; the first protrusion connects the radial inner side of the housing (i.e., the inner side of the clearance hole 3) and the top surface of the second insulating part 5; the second protrusion connects the top surface of the second flange 23 and the radial outer side of the conductive cap 2.

[0111] When the outer radial side of the cap 22 is tilted inward, the cap 22 can also limit the insulating filler 40 to prevent it from swaying away from the first flange 12.

[0112] In one embodiment, the conductive cap 22 protrudes from the insulating filler 40 along the direction from the first flange 12 to the second flange 23, which facilitates the electrical connection of the conductive cap 22 to external components. Alternatively, the insulating filler 40 may not protrude from the housing cover 20 along the direction from the first flange 12 to the second flange 23, and the housing cover 20 may also not protrude from the insulating filler 40 in this direction.

[0113] In one embodiment, the insulating filler 40 is formed within the clearance hole 3 by potting adhesive. After the electrode assembly 10 and the housing cover 20 are connected together by the insulating filler 30, insulating adhesive can be poured into the clearance hole 3. After the insulating adhesive cures, the insulating filler 40 is formed. This method facilitates the connection of the insulating filler 40 to the electrode 1, conductive cap 2, housing cover 20, and insulating filler 30. Moreover, during production, the adhesive can automatically fill the gaps between the corresponding parts, thereby improving the sealing effect.

[0114] In addition, the material of the insulating filler 40 can be an existing material, and the material of the insulating filler 40 and the material of the insulating member 30 can be the same or different.

[0115] like Figure 7 As shown, in one embodiment, the inner diameter of the second insulating portion 5 gradually increases along the direction from the first flange 12 to the second flange 23. At this time, along the direction from the first flange 12 to the second flange 23, the radially inner surface of the second insulating portion 5 gradually approaches the first insulating portion 4, that is, the radially outer surface of the second insulating portion 5 is inclined outwards. This increases the contact area between it and the insulating filler 40, thereby improving the connection strength between the two. Furthermore, this also facilitates the filling of the gap between the second insulating portion 5 and the second flange 23 with adhesive during the potting process.

[0116] This invention also provides a battery cell, which includes the cover plate 100 described in any of the above embodiments.

[0117] At this point, the battery cell also includes a housing and an electrode core. The housing has a receiving cavity with one end open, and the housing cover 20 closes the opening of the receiving cavity; wherein, the electrode core is disposed in the receiving cavity and is electrically connected to the electrode post 1; the first flange 12 is located in the receiving cavity and is located between the conductive cap 2 and the electrode core.

[0118] Specifically, the cover 20 is connected to the housing, the first tab of the electrode core is electrically connected to the pole post 1, and the second tab of the electrode core is electrically connected to the housing; one of the first tab and the second tab is a positive tab, and the other is a negative tab.

[0119] The shell can be a stainless steel shell, and the cover 20 can be a stainless steel cover; the two can be welded together.

[0120] This invention also provides an electrical device comprising the battery cell described in any of the foregoing embodiments. The electrical device can be any known device that requires power supply and / or energy storage using a battery cell, such as Bluetooth headsets, hearing aids, mobile phones, computers, wearable devices, aircraft, energy storage devices, power tools, and vehicles.

[0121] It should be understood that the above-mentioned settings can also be replaced in other ways, such as: In other embodiments, the boss 111 and the conductive cap 2 can also be fixed together by means of threaded connection or casting.

[0122] In other embodiments, the first flange 12 and the second flange 23 can also be welded together, which can improve the connection strength between the pole 1 and the conductive cap 2. At the same time, the welded structure formed after welding can surround the cap body 22, so that the boss 111 is in a sealed environment, thereby better preventing it from oxidation.

[0123] In other embodiments, the inner surface of the conductive cap 2 is also covered with a conductive protective layer. The inner surface of the conductive cap 2 includes the inner side of the mounting groove 21 (i.e., the radial inner side of the cap body 22) and the bottom surface of the mounting groove. The entire inner surface of the cap 2 can be covered by the conductive protective layer. Alternatively, only a portion of the inner surface of the cap 2 may be covered by the conductive protective layer.

[0124] In other embodiments, the conductive protective layer is also part of the conductive cap 2, and the conductive cap 2 achieves greater oxidation resistance than the boss precisely because of the conductive protective layer. In this case, the conductive cap 2 also includes a cap body 22, with the conductive protective layer covering its outer surface. Furthermore, the conductive protective layer can simultaneously cover both the inner and outer surfaces of the cap body 22. Additionally, if the conductive cap 2 also includes a second flange 23, the conductive protective layer can also cover the outer surface of the second flange. In this embodiment, the oxidation resistance of both the cap body 22 and the second flange 23 can be less than that of the boss 111.

[0125] In other embodiments, the conductivity of the conductive cap 2 is superior to that of the boss 111, thereby further improving the conductivity of the electrode assembly. In the above embodiments, when the conductive cap 2 is a stainless steel cap and the electrode is an aluminum pillar, the conductivity of the conductive cap 2 is weaker than that of the boss 111, regardless of whether a nickel layer (i.e., a nickel conductive protective layer) is provided. However, if the conductive protective layer covering the stainless steel cap is set to a gold or silver layer, the overall conductivity of the conductive cap 2 can be made superior to that of the boss 111. Of course, the conductive cap 2 can also be made directly from materials such as gold or silver to make its conductivity superior to that of the boss 111.

[0126] In other embodiments, both the housing and the cover 20 described above can be made of insulating material. In this case, the cover 20 can have two pole post assemblies 10, which are spaced apart. One pole post assembly 10 is electrically connected to the positive electrode, and the other pole post assembly 10 is electrically connected to the negative electrode.

[0127] In other embodiments, when the battery cell includes the terminal assembly 10 but does not include the aforementioned cover plate 100, the battery cell includes a sealing plate in addition to the aforementioned housing and terminal core. In this case, the sealing plate closes the opening of the receiving cavity, and the housing has a clearance hole 3. The terminal assembly 10 is connected to the housing and protrudes from the clearance hole 3 for electrical connection to external components. That is, in the above embodiments, the terminal 1 is disposed on the housing cover 20, while in this embodiment, the terminal 1 is disposed on the housing.

[0128] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0129] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention 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 the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A pole assembly, characterized in that, Including the pole and the conductive cap; The conductive cap (2) has a recessed mounting groove (21) in a direction away from the pole post (1); The pole post (1) includes a column body (11) and a first flange (12), the first flange (12) being connected around the column body (11), and one axial end of the column body (11) protruding from the first flange (12) to form a boss (111). The boss (111) is inserted into the mounting groove (21) and electrically connected to the conductive cap (2). The antioxidant properties of the conductive cap (2) are superior to those of the boss (111).

2. The pole assembly according to claim 1, characterized in that, Along the axial direction of the column, at least one section of the mounting groove is an anti-detachment groove, and at least one section of the pole post is an anti-detachment post; Along the direction from the boss (111) to the flange, the inner diameter of the anti-detachment groove (211) gradually decreases and the outer diameter of the anti-detachment column (112) gradually decreases; The anti-detachment column (112) is located inside the anti-detachment groove (211), and the radial side of the anti-detachment groove (211) and the radial side of the anti-detachment column (112) are in contact.

3. The pole assembly according to claim 2, characterized in that, The anti-detachment groove extends from the bottom of the mounting groove to the opening of the mounting groove, and the anti-detachment post extends from the end of the boss away from the first flange to the first flange, with the end face of the boss away from the first flange abutting against the bottom surface of the mounting groove; and / or, The inclination angle of the radial side of the anti-detachment groove (211) is A, where 70°≤A≤87°.

4. The pole assembly according to claim 1, characterized in that, The conductive cap includes a cap body and a second flange, and the mounting groove is provided in the cap body; the second flange is circumferentially connected to the end of the cap body near the first flange and abuts against the first flange.

5. The pole assembly according to claim 4, characterized in that, Along the direction from the second flange to the first flange, the outer diameter of the cap body gradually decreases; The inclination angle of the radial outer surface of the cap (22) is B, where 70°≤B≤87°.

6. The pole assembly according to claim 1, characterized in that, Both the conductive cap and the boss are made of existing metal materials; and / or, the boss (111) is riveted into the mounting groove (21); and / or, The conductive cap (2) abuts against the first flange (12).

7. The pole assembly according to claim 1, characterized in that, The pole is an aluminum pole, and the cap is a stainless steel cap.

8. The pole assembly according to claim 1, characterized in that, The outer surface of the conductive cap (2) is provided with a conductive protective layer. The antioxidant properties of the conductive protective layer are greater than those of the conductive cap (2), and the conductivity of the conductive protective layer is greater than that of the conductive cap (2). Wherein, the thickness of the conductive protective layer is C, where 1um≤C≤3um; and / or, the conductive protective layer is any one of a nickel layer, a gold layer, and a silver layer.

9. The pole assembly according to claim 1, characterized in that, The conductivity of the conductive cap (2) is better than that of the boss (111).

10. A cover plate, characterized in that, Includes a housing cover, an insulating component, and the pole assembly as described in any one of claims 1-7; The cover (20) is provided with a clearance hole (3); the clearance hole (3) passes through the cover (20) along the axial direction of the column (11). The conductive cap (2) protrudes from the clearance hole (3); The insulating element (30) is disposed between the housing cover (20) and the pole assembly (10) to insulate the housing cover (20) and the pole assembly (10); The pole assembly (10) and the insulating element (30) cooperate to seal the clearance hole (3).

11. The cover plate according to claim 10, characterized in that, The conductive cap and the column are inserted into the clearance hole; Along the axial direction of the mounting groove (21), the insulating member (30) includes a first insulating part (4) and a second insulating part (5) that are in contact; the first insulating part (4) is located between the first flange (12) and the shell cover (20) and connects the first flange (12) and the shell cover (20). The second insulating part (5) is opposite to the clearance hole (3).

12. The cover plate according to claim 10, characterized in that, Both the first insulating portion and the second insulating portion surround the conductive cap; and / or, Along the direction from the first insulating part (4) to the second insulating part (5), the surface of the second insulating part (5) away from the first flange (12) gradually moves away from the first flange (12); the side of the second insulating part (5) away from the first insulating part (4) extends into the clearance hole (3).

13. The cover plate according to claim 10, characterized in that, The conductive cap includes a cap body and a second flange, and the mounting groove is disposed in the cap body; the second flange is circumferentially connected to the end of the cap body near the first flange and surrounds the axis of the mounting groove; Along the direction from the second flange (23) to the first flange (12), the outer diameter of the cap (22) gradually decreases; The second flange (23) abuts against the first flange (12) and is spaced apart from the second insulating part (5); The cover plate (100) also includes an insulating filler (40), which is formed in the clearance hole (3) by potting. The insulating filler (40) includes a first filling part (6) and a second filling part (7); the first filling part (6) fills between the second flange (23) and the second insulating part (5) and connects the first flange (12), the second flange (23) and the second insulating part (5); the second filling part (7) fills between the cap body (22) and the shell cover (20) and connects the first filling part (6), the cap body (22) and the shell cover (20).

14. A battery cell, characterized in that, Includes the pole assembly as described in any one of claims 1-9 or the cover plate as described in any one of claims 10-13.

15. A battery cell, characterized in that, Includes a housing, an electrode core, and a cover plate as described in any one of claims 8-11; The housing has a receiving cavity with an opening at one end, and the housing cover (20) closes the opening of the receiving cavity; The electrode core is disposed in the receiving cavity and is electrically connected to the electrode post (1); The first flange (12) is located inside the receiving cavity and between the conductive cap (2) and the pole core.

16. An electrical appliance, characterized in that, Includes the battery cell described in any one of claims 14-16.

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