Top cover assembly and battery

Abstract

The present invention relates to the field of battery technology, and discloses a top cover assembly and a battery, wherein the top cover assembly comprises: a pole, wherein the outer peripheral surface of the pole is configured with a first groove; a cover plate, comprising a cover plate body and a mounting hole penetrating the cover plate body, wherein the pole is arranged in the mounting hole, and a second recessed portion is configured on one side of the cover plate body close to the mounting hole; a sealing assembly, which is arranged between the cover plate and the pole, and wherein the sealing assembly has a first protrusion and a second protrusion, wherein the first protrusion cooperates with the first groove, and the second protrusion cooperates with the second recessed portion, so as to seal and connect the pole and the cover plate, and limit the displacement of the pole relative to the cover plate. The present invention avoids the relative displacement of the pole and the sealing assembly by inserting the first protrusion into the first groove; avoids the relative displacement of the cover plate and the sealing assembly by inserting the second protrusion into the second recessed portion, thereby realizing the relative fixation of the pole and the cover plate, effectively avoiding the relative displacement between the pole and the cover plate, and avoiding the loosening between the pole and the cover plate.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a top cover assembly and a battery. Background Art

[0002] The top cover assembly includes a cover plate and a pole mounted on the cover plate, etc. The top cover assembly has a significant impact on the safety of the battery. The cover plate of the top cover assembly and the pole need to have good sealing to prevent air moisture from entering the battery and prevent the electrolyte in the battery from leaking; at the same time, the stability of the connection between the pole and the cover plate must be ensured to prevent the connection between the pole and the cover plate from loosening when the pole is subjected to external force, resulting in the safety risk of external moisture entering the battery and electrolyte leakage, thereby ensuring the safety of the battery.

[0003] However, since the cover plate and the pole in the top cover assembly are two independent components, and the pole in the prior art is usually configured to be cylindrical, although the seal provided between the cover plate and the pole can achieve a sealed connection between the cover plate and the pole, when the battery is used to assemble a battery pack, etc., the pole is often subjected to large torsional and tensile forces, resulting in circumferential and axial relative displacement between the pole and the cover plate, and relative looseness between the pole and the cover plate, thereby destroying the sealing and connection strength of the top cover assembly and having a great impact on the safety performance of the battery. Summary of the invention

[0004] In view of this, the present invention provides a top cover assembly and a battery to solve the problem of relative displacement between the pole and the cover plate.

[0005] In the first aspect, the present invention provides a top cover assembly, comprising: a pole, the outer peripheral surface of which is configured with a first groove; a cover plate, comprising a cover plate body and a mounting hole penetrating the cover plate body, the pole is passed through the mounting hole, and a second recessed portion is configured on one side of the cover plate body close to the mounting hole; a sealing assembly, arranged between the cover plate and the pole, the sealing assembly having a first protrusion and a second protrusion, the first protrusion cooperates with the first groove, and the second protrusion cooperates with the second recessed portion to seal and connect the pole and the cover plate, and limit the displacement of the pole relative to the cover plate.

[0006] Beneficial effect: the first protrusion protruding from the surface of the sealing component is inserted into the first groove, so as to realize the fitting connection between the sealing component and the pole, and avoid relative displacement between the pole and the sealing component; the second protrusion protruding from the surface of the sealing component is inserted into the second recessed portion, so as to realize the fitting connection between the sealing component and the cover plate, and avoid relative displacement between the cover plate and the sealing component. The plug-in fitting connection mode has good stability and is not prone to relative displacement. Therefore, the relative fixation of the pole and the cover plate is realized through the connection action of the sealing component, and relative displacement between the pole and the cover plate is effectively avoided, and loosening between the pole and the cover plate is avoided, thereby improving the overall structural strength of the top cover assembly and improving safety.

[0007] In an optional embodiment, the first groove includes an annular groove portion and a first recessed portion, the annular groove portion surrounds the pole, and the first recessed portion is located on a side of the annular groove portion close to the center of the pole.

[0008] Beneficial effect: The annular groove is recessed from a partial area on the outer peripheral surface of the pole toward the direction close to the pole axis, forming a ring surrounding the pole. The convex ring on the sealing assembly is inserted into the annular groove, which can limit the relative displacement of the pole and the sealing assembly in the vertical direction, that is, the tensile strength between the pole and the sealing assembly is enhanced.

[0009] In an optional embodiment, the number of the first recessed parts is at least two, and at least two of the first recessed parts are equally spaced around the circumference of the annular groove part. The first recessed part is formed by a partial area on the side of the annular groove part close to the axis of the pole and continues to be recessed in the direction close to the axis of the pole. At least two first recessed parts are arranged at intervals around the inner circumference of the annular groove part. By inserting the protrusion on the sealing component into the first recessed part, the relative displacement of the pole and the sealing component in the vertical direction can be limited, and the relative rotation of the pole and the sealing component can be limited, thereby enhancing the tensile strength between the pole and the sealing component, and enhancing the torsional strength between the pole and the sealing component, and further enhancing the stability of the connection between the two.

[0010] In an optional implementation manner, the dimension of the first recessed portion along the radial direction of the pole is H1, wherein 0

[0011] ​Beneficial effects: Setting the dimension H1 of the first recessed portion along the radial direction of the pole to a value greater than 0 and less than or equal to 5 mm can ensure the strength of the pole and improve safety. Setting the dimension W1 of the first recessed portion along the thickness direction of the pole and the dimension L1 of the first recessed portion along the circumference of the pole 1 to a value not greater than 5 mm can ensure the structural strength of the pole 1; setting L1 / W1 to a value between 1 and 6 can ensure both the strength of the pole and the torsional strength and tensile strength between the pole and the sealing assembly. Setting the arc between two adjacent first recessed portions to between π / 30 and π is not only convenient for processing, but also can ensure that there are a sufficient number of first recessed portions on the pole to ensure sufficient torsional strength between the pole and the sealing assembly.

[0012] In an optional embodiment, the dimension of the annular groove portion along the radial direction of the pole is H3, wherein H1≤H3≤5mm; and / or the dimension of the annular groove portion along the thickness direction of the pole is W3, wherein W1 <W3≤5*W1。

[0013] Beneficial effect: Setting the dimension H3 of the annular groove along the pole radial direction to be between the dimension H1 of the first recessed portion along the pole radial direction and 5 mm can ensure the strength of the pole and ensure sufficient tensile strength between the pole group and the sealing component. Setting the dimension W3 of the annular groove along the pole thickness direction to be between W1 and 5*W1 can facilitate processing and molding, and ensure sufficient strength of the pole, thereby improving stability.

[0014] In an optional embodiment, the number of the second recessed portions is at least two, and at least two of the second recessed portions are arranged around the circumference of the mounting hole.

[0015] Beneficial effect: The second recessed portion is recessed inwardly from the outer surface of the cover body, and at least two second recessed portions are arranged circumferentially around the mounting hole. The second protrusion on the sealing assembly is inserted into the second recessed portion, which can limit the relative rotation between the cover and the sealing assembly, thereby enhancing the torsional strength between the cover and the sealing assembly and increasing the stability of the connection between the cover and the sealing assembly.

[0016] In an optional implementation, the second recessed portion is disposed on a side wall of the mounting hole.

[0017] Beneficial effects: By providing a second recess on the side wall of the mounting hole, after the second protrusion is inserted into the second recess, it can not only limit the relative displacement of the cover plate and the sealing assembly in the up and down direction, but also limit the relative rotation of the cover plate and the sealing assembly. Thus, it can not only strengthen the tensile strength between the cover plate and the sealing assembly, but also strengthen the torsional strength between the cover plate and the sealing assembly, further enhancing the stability of the connection between the two. Moreover, the second recess is disposed opposite to the first groove, such that the first protrusion and the second protrusion are disposed opposite to each other. Both sides of the sealing assembly facing the pole column and the cover plate body can be subjected to tensile force in the up and down direction and / or rotational force along the circumferential direction, with uniform stress on both sides, which is beneficial to ensuring the rationality of the stress and extending the service life.

[0018] In an optional embodiment, the radian between two adjacent second recesses is d2, where π / 30 < d2 ≤ π; and / or, the dimension of the second recess along the radial direction of the cover plate body is H2, where 0 < H2 ≤ 5 mm; and / or, the dimension of the second recess along the thickness direction of the cover plate body is W2, and the dimension of the second recess along the circumferential direction of the mounting hole is L2, where 0 < W2 ≤ L2 ≤ 4 mm, and 1 ≤ L2 / W2 ≤ 6.

[0019] Beneficial effects: Setting the radian between two adjacent second recesses between π / 30 and π is not only convenient for processing, but also can ensure that there are a sufficient number of second recesses on the cover plate body to ensure sufficient torsional strength between the cover plate and the sealing assembly. Setting the dimension of the second recess along the radial direction of the cover plate body within the range greater than 0 and less than or equal to 5 mm can ensure sufficient structural strength of the cover plate and improve safety. Setting the dimension W2 of the second recess along the thickness direction of the cover plate body and the dimension L2 of the second recess along the circumferential direction of the cover plate body within the range not greater than 5 mm can ensure the strength of the cover plate body; setting L2 / W2 between 1 and 6 can not only ensure the strength of the cover plate body, but also ensure the torsional strength and tensile strength between the cover plate body and the sealing assembly.

[0020] In an optional embodiment, the sealing assembly includes: an upper plastic, which is disposed between the pole column and the cover plate body, and the first protrusion and the second protrusion are formed on the upper plastic to connect with the pole column and the cover plate.

[0021] Beneficial effects: the upper plastic is injection molding, the first protrusion, the second protrusion and the upper plastic body are integrally formed, the molding process is simple and the reliability after molding is high, the first groove on the pole and the second recessed portion on the cover body are filled with injection molding, the injection molding has a certain strength, and plays a role in connecting the pole and the cover, while ensuring that the pole and the cover have strong tensile strength and torsional strength, ensuring the stability and firmness of the connection between the pole and the cover, improving the reliability of the top cover assembly, preventing the pole and the cover from loosening, thereby preventing moisture outside the battery from entering the battery, preventing the electrolyte inside the battery from flowing out, and ensuring the safety of the battery.

[0022] In a second aspect, the present invention further provides a battery, comprising: a housing having an open end; a pole group located in the housing; the above-mentioned top cover assembly, the top cover assembly being mounted on the open end of the housing to seal the housing, and the pole of the top cover assembly being electrically connected to the pole group. Because the battery includes the top cover assembly, it has the same effect as the top cover assembly, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a structural schematic diagram of a top cover assembly according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 A is a partial enlarged schematic diagram;

[0026] Figure 3 for Figure 1 A partial cross-sectional view of the top cover assembly along the BB direction shown;

[0027] Figure 4 It is a schematic diagram of the structure of a pole according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the upper plastic according to an embodiment of the present invention;

[0029] Figure 6 A schematic structural diagram of another top cover assembly according to an embodiment of the present invention;

[0030] Figure 7 for Figure 6 A partial enlarged schematic diagram of C in the middle.

[0031] Description of reference numerals:

[0032] 1. Pole; 101. First groove; 102. Ring groove; 103. First recessed portion; 104. First ring groove; 105. Second ring groove; 110. First column section; 120. Second column section; 201. Cover body; 202. Second recessed portion; 3. Upper plastic; 301. First protruding portion; 302. Second protruding portion; 303. Convex ring; 304. Bump; 4. Sealing ring; 5. Lower plastic. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0034] Combine the following Figures 1 to 7 , describing an embodiment of the present invention.

[0035] According to an embodiment of the present invention, on the one hand, a top cover assembly is provided, comprising: a pole 1, a cover plate and a sealing assembly. The outer peripheral surface of the pole 1 is configured with a first groove 101; the cover plate comprises a cover plate body 201 and a mounting hole penetrating the cover plate body 201, the pole 1 is passed through the mounting hole, and a second recessed portion 202 is configured on the side of the cover plate body 201 close to the mounting hole; the sealing assembly is arranged between the cover plate and the pole 1, and the sealing assembly has a first protruding portion 301 and a second protruding portion 302, the first protruding portion 301 cooperates with the first groove 101, and the second protruding portion 302 cooperates with the second recessed portion 202, so as to seal and connect the pole 1 and the cover plate, and limit the displacement of the pole 1 relative to the cover plate.

[0036] By using the top cover assembly of the present embodiment, the first protrusion 301 protruding from the surface of the sealing assembly is inserted into the first groove 101, so as to realize the fitting connection between the sealing assembly and the pole 1, thereby avoiding relative displacement between the pole 1 and the sealing assembly; the second protrusion 302 protruding from the surface of the sealing assembly is inserted into the second recessed portion 202, so as to realize the fitting connection between the sealing assembly and the cover plate, thereby avoiding relative displacement between the cover plate and the sealing assembly. The plug-in fitting connection mode has good stability and is not prone to relative displacement. Therefore, the relative fixation and sealing of the pole 1 and the cover plate are realized through the connection action of the sealing assembly, and relative displacement between the pole 1 and the cover plate is effectively avoided, and loosening between the pole 1 and the cover plate is avoided, thereby improving the overall structural strength of the top cover assembly and improving safety.

[0037] It should be noted that the first groove 101 is recessed from the outer circumference of the pole 1 to the axial direction of the pole 1, and the first protrusion 301 protrudes from the inner circumference of the sealing component to be inserted into the first groove 101, which can prevent the pole 1 and the sealing component from being Figure 1 The relative displacement in the "up and down" direction indicated by the middle arrow can avoid the relative rotation between the pole 1 and the sealing assembly, thereby enhancing the tensile strength and torsional strength between the pole 1 and the sealing assembly; the second recessed portion 202 is recessed toward the inside of the cover body 201, and the second protruding portion 302 protrudes from the side of the sealing assembly away from the pole 1 to be inserted into the second recessed portion 202. The plug-in connection method can avoid the relative rotation of the sealing assembly and the cover, thereby enhancing the torsional strength between the sealing assembly and the cover, and then the first groove 101 and the second recessed portion 202 are simultaneously plugged with the sealing assembly to further enhance the overall structural strength of the top cover assembly, better solve the problem of loose connection between the pole 1 and the cover due to low torsional strength of the pole 1, avoid the problem of moisture outside the battery entering the battery or electrolyte in the battery seeping out, and reduce the safety risk of excessive battery moisture or leakage during battery pack assembly. The outer peripheral surface of the pole 1 refers to the circumferential surface of the pole 1 facing the hole wall of the mounting hole; the sealing assembly has a certain strength, the sealing assembly is arranged around the outer peripheral surface of the pole 1, and the inner peripheral surface of the sealing assembly refers to the surface of the sealing assembly facing the pole 1. The relative rotation refers to the rotation along the axis of the pole 1, and the axis of the pole 1 coincides with the axis of the cover plate and the axis of the sealing assembly.

[0038] Preferably, the cover plate is made of aluminum, which is light and can meet the strength requirements of the cover plate.

[0039] In one embodiment, Figures 1 to 4 As shown, the first groove 101 includes an annular groove portion 102 and a first recessed portion 103. The annular groove portion 102 surrounds the pole 1, and the first recessed portion 103 is located on one side of the annular groove portion 102 close to the center of the pole 1. Figure 5 As shown, the first protrusion 301 includes a protruding ring 303 and a protruding block 304. The protruding block 304 is arranged on the side of the protruding ring 303 close to the axis of the pole 1. The protruding ring 303 cooperates with the annular groove 102, and the protruding block 304 cooperates with the first recessed portion 103. The annular groove 102 is recessed from a part of the outer circumference of the pole 1 toward the direction close to the axis of the pole 1, forming a ring around the pole 1. By inserting the protruding ring 303 on the sealing assembly into the annular groove 102, the relative displacement of the pole 1 and the sealing assembly in the up-down direction can be limited, that is, the tensile strength between the pole 1 and the sealing assembly is strengthened. The up-down direction refers to Figure 1 The arrow in the middle points to the direction of "up and down".

[0040] In addition, in other embodiments, Figure 6 to Figure 7 As shown, the annular groove portion 102 in the first groove 101 includes a first annular groove 104 and a second annular groove 105 connected to each other, the first annular groove 104 is connected to the outer peripheral surface of the pole 1, the second annular groove 105 is arranged between the first annular groove 104 and the first recessed portion 103, and the size of the second annular groove 105 in the vertical direction is greater than the size of the first annular groove 104 and the first recessed portion 103 in the vertical direction. Correspondingly, the first protrusion 301 is configured to be in a shape that matches the first groove 101, so that the first protrusion 301 and the first groove 101 can be clamped together through the second annular groove 105 located in the middle, preventing the first protrusion 301 from coming out of the first groove 101, limiting the relative movement of the sealing assembly and the pole 1 along the radial direction of the pole 1, and further improving the stability of the connection between the pole 1 and the sealing assembly. Wherein, the radial direction of the pole 1 is perpendicular to the axial direction of the pole 1.

[0041] In addition, in other embodiments, the first groove 101 may also only be provided with the first recessed portion 103, without the annular groove portion 102, that is, a plurality of first recessed portions 103 are arranged at intervals along the circumferential direction on the circumferential surface of the pole 1, and correspondingly, the first protrusion 301 is a plurality of protrusions 304 arranged at intervals around the inner circumferential surface of the sealing assembly, and the protrusions 304 are directly inserted into the first recessed portion 103, which can also achieve the limitation of the sealing assembly and the pole 1 in the up and down directions and the circumferential direction, thereby enhancing the tensile strength and torsional strength between the sealing assembly and the pole 1.

[0042] In one embodiment, the number of the first recessed portions 103 is at least two, and at least two first recessed portions 103 are equally spaced around the circumference of the annular groove portion 102. The first recessed portion 103 is formed by a partial area on the side of the annular groove portion 102 close to the axis of the pole 1 and continues to be recessed in the direction close to the axis of the pole 1. At least two first recessed portions 103 are spaced around the inner circumference of the annular groove portion 102. The protrusion 304 on the sealing assembly is inserted into the first recessed portion 103, which can limit the relative displacement of the pole 1 and the sealing assembly in the vertical direction, and limit the relative rotation of the pole 1 and the sealing assembly, thereby enhancing the tensile strength between the pole 1 and the sealing assembly, and also enhancing the torsional strength between the pole 1 and the sealing assembly, further enhancing the stability of the connection between the two. Among them, the inner circumference of the annular groove portion 102 refers to the side of the annular groove portion 102 close to the axis of the pole 1.

[0043] In one embodiment, the radian between two adjacent first recesses 103 is d1, where π / 30 < d1 ≤ π. The smaller the radian between two adjacent first recesses 103, the more the number of first recesses 103 provided on the terminal post 1. The larger the radian between two adjacent first recesses 103, the fewer the number of first recesses 103 provided on the terminal post 1. If d1 is less than π / 30, the distance between two adjacent first recesses 103 is too small, and the processing accuracy requirement for the first recess 103 is relatively high, making processing difficult and increasing the manufacturing cost. If d1 is greater than π, the distance between two adjacent first recesses 103 is too large, resulting in too few first recesses 103, with a poor anti-twist effect and even the anti-twist function failing. Therefore, setting the radian between two adjacent first recesses 103 between π / 30 and π is convenient for processing and can ensure that there are enough first recesses 103 on the terminal post 1 to ensure sufficient anti-twist strength between the terminal post 1 and the sealing component.

[0044] Preferably, the radian d1 between two adjacent first recesses 103 is π / 6, and six first recesses 103 are formed on the terminal post 1, which is convenient for processing and has sufficient anti-twist strength.

[0045] In one embodiment, as Figures 2 to 3 shown, the dimension of the first recess 103 in the radial direction of the terminal post 1 is H1, where 0 < H1 ≤ 5 mm. H1 is the distance that the first recess 103 recesses in the direction of the axis of the terminal post 1. If H1 is greater than 5 mm, the dimension of the first recess 103 in the radial direction of the terminal post 1 is too large, which will cause the diameter dimension of the solid part of the terminal post 1 corresponding to the first recess 103 to be too small, reducing the strength of the terminal post 1 itself, and the terminal post 1 is prone to fracture, which is not conducive to ensuring safety. Therefore, setting the dimension H1 of the first recess 103 in the radial direction of the terminal post 1 within the range greater than 0 and less than or equal to 5 mm can ensure the strength of the terminal post 1 and improve safety.

[0046] Preferably, the dimension H1 of the first recess 103 in the radial direction of the terminal post 1 is 2 mm.

[0047] In one embodiment, as Figures 1 to 3 shown, the dimension of the first recess 103 in the thickness direction of the terminal post 1 is W1, and the dimension of the first recess 103 in the circumferential direction of the terminal post 1 is L1, where 0 < W1 ≤ L1 ≤ 5 mm, 1 ≤ L1 / W1 ≤ 6. The thickness direction of the terminal post 1 refers to Figure 1The "up and down" direction indicated by the arrow in the middle. The larger the dimension W1 of the first recessed portion 103 along the thickness direction of the pole 1 and the dimension L1 along the circumference of the pole 1, the larger the volume of the first recessed portion 103. If the dimension W1 of the first recessed portion 103 along the thickness direction of the pole 1 and the dimension L1 along the circumference of the pole 1 are greater than 5 mm, the volume of the first recessed portion 103 is too large, and correspondingly, the entity part of the pole 1 is reduced, the strength of the pole 1 is reduced, the pole 1 is prone to fracture, and the safety is poor. Therefore, the dimension W1 of the first recessed portion 103 along the thickness direction of the pole 1 and the dimension L1 of the first recessed portion 103 along the circumference of the pole 1 are set within a range of no more than 5 mm, which can ensure the structural strength of the pole 1. If L1 / W1 is less than 1, the size of the first recessed portion 103 along the circumferential direction of the pole 1 is too small, and the first recessed portion 103 is in the shape of a narrow strip, resulting in insufficient strength of the first protruding portion 301 matched with the first recessed portion 103, insufficient torsional strength, and easy breakage; if L1 / W1 is greater than 6, the size of the first recessed portion 103 along the circumferential direction of the pole 1 is too large, the size of the first recessed portion 103 in the thickness direction of the pole 1 is too small, and the first recessed portion 103 is flat, so that the size of the pole entity part along the circumferential direction of the pole 1 between two adjacent first recessed portions 103 is reduced, the strength of the pole 1 is reduced, the torsional performance of the pole 1 is deteriorated, and the tensile strength between the pole 1 and the sealing assembly along the up and down directions is also reduced. Therefore, setting L1 / W1 to a value between 1 and 6 can not only ensure the strength of the pole 1, but also ensure the torsional strength and tensile strength between the pole 1 and the sealing assembly.

[0048] Preferably, a dimension W1 of the first recessed portion 103 along the thickness direction of the pole 1 is 2 mm; a dimension L1 of the first recessed portion 103 along the circumferential direction of the pole 1 is 2 mm.

[0049] In one embodiment, Figure 2 As shown, the dimension of the annular groove 102 along the radial direction of the pole 1 is H3, where H1≤H3≤5mm. H3 is the distance that the annular groove 102 is recessed from the surface of the circumferential surface of the pole 1 to the axial direction of the pole 1. If H3 is less than H1, the dimension of the annular groove 102 is smaller than the first recessed portion 103, and the strength of the annular groove 102 is weak, which reduces the tensile strength between the pole 1 and the sealing assembly. If H3 is greater than 5mm, the dimension of the annular groove 102 along the radial direction of the pole 1 is too large, which will cause the diameter of the physical part of the pole 1 corresponding to the annular groove 102 to be too small, and the strength of the pole 1 is reduced, which is easy to break and is not conducive to ensuring safety. Therefore, setting the dimension H3 of the annular groove 102 along the radial direction of the pole 1 between the dimension H1 of the first recessed portion 103 along the radial direction of the pole 1 and 5mm can ensure the strength of the pole 1 and ensure that there is sufficient tensile strength between the pole 1 and the sealing assembly.

[0050] In one embodiment, Figures 1 to 3As shown, the dimension of the annular groove portion 102 in the thickness direction of the pole column 1 is W3, where W1 < W3 ≤ 5 * W1. By setting the dimension W3 of the annular groove portion 102 in the thickness direction of the pole column 1 to be greater than the dimension W1 of the first recess portion 103 in the thickness direction of the pole column 1, it is convenient for processing and forming. And in the thickness direction of the pole column 1, the dimension of the convex ring 303 in the first protrusion portion 301 is greater than the dimension of the convex block 304, ensuring that the convex ring 303 provides sufficient support for the convex block 304, thus ensuring the overall structural strength. If the dimension W3 of the annular groove portion 102 in the thickness direction of the pole column 1 is greater than 5 times the dimension W1 of the first recess portion 103 in the thickness direction of the pole column 1, then W3 is too large, the thickness of the solid part of the pole column 1 corresponding to the annular groove portion 102 decreases, the strength of the pole column 1 decreases, the pole column 1 is prone to fracture, and the safety is poor. Therefore, setting the dimension W3 of the annular groove portion 102 in the thickness direction of the pole column 1 to take values between W1 and 5 * W1 is not only convenient for processing and forming, but also can ensure that the pole column 1 has sufficient strength, thereby improving stability.

[0051] Preferably, the dimension H3 of the annular groove portion 102 in the radial direction of the pole column 1 is 2 mm; the dimension W3 of the annular groove portion 102 in the thickness direction of the pole column 1 is 4 mm.

[0052] In one embodiment, the number of the second recess portions 202 is at least two, and at least two second recess portions 202 are arranged circumferentially around the mounting hole. The second recess portions 202 are recessed inward from the outer surface of the cover plate body 201. By arranging at least two second recess portions 202 circumferentially around the mounting hole and inserting the second protrusion portions 302 on the sealing component into the second recess portions 202, the relative rotation between the cover plate and the sealing component can be restricted, thereby enhancing the torsional strength between the cover plate and the sealing component and increasing the stability of the connection between the cover plate and the sealing component.

[0053] In one embodiment, as Figures 1 to 4 shown, the second recess portions 202 are arranged on the side wall of the mounting hole. The side wall of the mounting hole faces the direction where the pole column 1 is located. By arranging the second recess portions 202 on the side wall of the mounting hole, after the second protrusion portions 302 are inserted into the second recess portions 202, the relative displacement between the cover plate and the sealing component in the up and down direction can be restricted, and the relative rotation between the cover plate and the sealing component can also be restricted. Thus, the tensile strength between the cover plate and the sealing component can be enhanced, and the torsional strength between the cover plate and the sealing component can also be enhanced, further enhancing the stability of the connection between the two. And the second recess portions 202 are arranged opposite to the first groove 101, so that the first protrusion portions 301 and the second protrusion portions 302 are arranged opposite to each other. Both sides of the sealing component facing the pole column 1 and the cover plate body 201 can be subjected to tensile force in the up and down direction and / or rotational force along the circumferential direction. The force on both sides is uniform, which is beneficial to ensuring the rationality of the force and prolonging the service life.

[0054] In addition, in other embodiments, as Figure 6 to Figure 7 As shown, the second recess 202 can also be arranged at a position on the upper surface of the cover plate body 201 close to the mounting hole. The second recess 202 opens upward. Correspondingly, the second protrusion 302 is inserted into the second recess 202 from top to bottom. At least two second recesses 202 are distributed at intervals along the circumference of the mounting hole. Through the cooperation of the second protrusion 302 and the second recess 202, circumferential limitation between the cover plate and the sealing assembly can also be achieved, preventing relative rotation between the cover plate and the sealing assembly, thereby increasing the torsional strength between the cover plate and the sealing assembly. Herein, "up" refers to Figure 6 the direction of "up" indicated by the arrow in Figure 6 and "down" refers to

[0055] the direction of "down" indicated by the arrow in

[0056] In one embodiment, the radian between two adjacent second recesses 202 is d2, where π / 30 < d2 ≤ π. The smaller the radian between two adjacent second recesses 202, the more the number of second recesses 202 arranged on the cover plate body 201. The larger the radian between two adjacent second recesses 202, the fewer the number of second recesses 202 arranged on the cover plate body 201. If d1 is less than π / 30, the distance between two adjacent second recesses 202 is too small, and the processing accuracy requirement for the second recess 202 is relatively high, making processing difficult and increasing the manufacturing cost. If d1 is greater than π, the distance between two adjacent second recesses 202 is too large, resulting in too few anti-torsion grooves and a low anti-torsion effect, or even the anti-torsion function fails. Therefore, setting the radian between two adjacent second recesses 202 between π / 30 and π is convenient for processing and can ensure that there are enough second recesses 202 on the cover plate body 201 to ensure sufficient torsional strength between the cover plate and the sealing assembly.

[0057] In one embodiment, as Figures 2 to 3 shown, the dimension of the second recess 202 along the radial direction of the cover plate body 201 is H2, where 0 < H2 ≤ 5 mm. If H2 is greater than 5 mm, the dimension of the second recess 202 along the radial direction of the cover plate body 201 is too large, which will cause the diameter dimension of the solid part of the cover plate body 201 corresponding to the second recess 202 to be too small, reducing the strength of the cover plate body 201 and making it prone to fracture, which is not conducive to ensuring safety. Therefore, setting the dimension of the second recess 202 along the radial direction of the cover plate body 201 to be within the range greater than 0 and less than or equal to 5 mm can ensure that the cover plate has sufficient structural strength and improve safety. Herein, the radial direction of the cover plate body 201 is perpendicular to its axis.

[0058] Preferably, the dimension H2 of the second recess 202 in the radial direction of the cover body 201 is 2 mm.

[0059] In one embodiment, as Figures 1 to 3 shown, the dimension of the second recess 202 in the thickness direction of the cover body 201 is W2, and the dimension of the second recess 202 in the circumferential direction of the mounting hole is L2, where 0 < W2 ≤ L2 ≤ 4 mm and 1 ≤ L2 / W2 ≤ 6. The thickness direction of the cover body 201 refers to Figure 1 the "up and down" direction indicated by the arrow in

[0060] Preferably, the dimension W2 of the second recess 202 in the thickness direction of the cover body 201 is 1 mm; the dimension L2 of the second recess 202 in the circumferential direction of the mounting hole is 2 mm.

[0061] In one embodiment, the pole 1 includes a first column section 110 and a second column section 120, the first column section 110 is located above the second column section 120 and the diameter of the second column section 120 is larger than the diameter of the first column section 110, the first column section 110 is inserted into the mounting hole, the second column section 120 is located below the cover plate, and the second column section 120 cannot pass through the mounting hole, so as to limit the axial position of the pole 1 and prevent the pole 1 from escaping from the mounting hole from bottom to top. The circumferential part of the cover plate body 201 surrounding the mounting hole is constructed as an annular mounting area, and the other part is a non-mounting area, the thickness of the mounting area is less than the thickness of the non-mounting area, and the second column section 120 cooperates with the mounting area.

[0062] In one embodiment, the sealing assembly includes: an upper plastic 3, the upper plastic 3 is arranged between the pole 1 and the cover body 201, and the upper plastic 3 is configured with a first protrusion 301 and a second protrusion 302 to connect with the pole 1 and the cover. It should be noted that the upper plastic 3 is an injection molding glue, and the first protrusion 301, the second protrusion 302 and the upper plastic body are integrally formed, the molding process is simple and the reliability after molding is high, the first groove 101 on the pole 1 and the second recessed part 202 on the cover body 201 are filled with injection molding glue, and the injection molding glue has a certain strength, which plays a role in connecting the pole 1 and the cover, and at the same time ensures that the pole 1 and the cover have strong tensile strength and torsional strength, ensures the stability and firmness of the connection between the pole 1 and the cover, improves the reliability of the top cover assembly, prevents the pole 1 and the cover from loosening, thereby preventing moisture outside the battery from entering the battery, preventing the electrolyte inside the battery from flowing out, and ensuring the safety of the battery.

[0063] Specifically, there is a gap between the first column section 110 and the cover body 201, and the upper plastic 3 is clamped between the first column section 110 and the cover body 201. Part of the structure of the upper plastic 3 fills the gap between the first column section and the cover body 201, and further fills the first groove 101 and the second recessed portion 202. The upper plastic 3 also includes a portion located above the upper surface of the cover body 201, and the diameter of the portion is greater than the diameter of the mounting hole, so that it is clamped above the cover body 201, and the portion also abuts against the outer peripheral surface of the pole 1 to ensure the reliability of the connection between the pole 1 and the cover.

[0064] In one embodiment, the sealing assembly further includes: a sealing ring 4 and a lower plastic 5. The sealing ring 4 is located below the upper plastic 3 and surrounds the circumference of the first column section 110. The upper end surface of the sealing ring 4 abuts against the lower end surface of the upper plastic 3. Specifically, the sealing ring 4 is located between the first column section 110, the second column section 120, the upper plastic 3 and the installation area of ​​the cover body 201, and has a good sealing effect; the lower plastic 5 is located between the cover body 201, the pole 1 and the sealing ring 4, and abuts against the cover body 201, the pole 1 and the sealing ring 4. Specifically, the lower plastic 5 is in a stepped ring shape, and part of the structure of the lower plastic 5 is located in the space formed between the sealing ring 4, the second column section 120, the installation area and the non-installation area of ​​the cover body 201, and the other part of the structure is located below the non-installation area of ​​the cover body 201 and fits with the lower surface of the cover body 201, and has good sealing performance.

[0065] It should be noted that the sealing assembly is an insulating component, which ensures the sealing connection between the pole 1 and the cover plate while also ensuring the insulation between the pole 1 and the cover plate.

[0066] The specific assembly steps of the top cover assembly of this embodiment are as follows:

[0067] First, the pole 1 and the sealing ring 4 are placed in the mounting hole of the cover plate, and the sealing ring 4 is located between the lower surface of the mounting area of ​​the cover plate body 201 and the second pole section 120 of the pole 1. An upper cavity is formed between the first pole section 110 of the pole 1, the cover plate body 201 and the sealing ring 4, and a lower cavity is formed between the second pole section 120 of the pole 1, the cover plate body 201 and the sealing ring 4. Then, injection molding is performed in the upper cavity formed between the first pole section 110 of the pole 1, the cover plate body 201 and the sealing ring 4 to form an upper plastic 3, and injection molding is performed in the lower cavity formed between the second pole section 120, the cover plate body 201 and the sealing ring 4 to form a lower plastic 5. The upper plastic 3, the sealing ring 4 and the lower plastic 5 form a sealing assembly. After the injection molding is cooled, the pole 1 is fixed to the mounting hole of the cover plate by the injection molding.

[0068] According to an embodiment of the present invention, on the other hand, a battery is provided, comprising: a housing, an electrode group and the above-mentioned top cover assembly. The housing has an open end; the electrode group is located in the housing; the top cover assembly is installed at the open end of the housing to seal the housing, and the pole 1 of the top cover assembly is electrically connected to the electrode group.

[0069] In this embodiment, while the first groove 101 is provided on the pole 1, the second recessed portion 202 is provided on the cover body 201, which not only enhances the tensile strength and torsional strength between the pole 1 and the upper plastic 3, but also enhances the torsional strength between the upper plastic 3 and the cover body 201, thereby enhancing the tensile strength and torsional strength between the pole 1 and the cover, and better solves the safety risk of excessive battery moisture or leakage during battery pack processing due to low torsional strength of the pole 1.

[0070] In this embodiment, a first groove 101 is opened on the pole 1 to reduce the weight of the pole 1; a second recessed portion 202 is opened on the cover plate body 201 to reduce the weight of the cover plate. The pole 1 and the cover plate are both made of metal, and the first protrusion 301 is filled in the first groove 101, and the second protrusion is filled in the second recessed portion 202, that is, injection molding is used to replace the metal of the original first groove 101 on the pole 1 and the second recessed portion 202 on the cover plate. The injection molding is lighter, so the total weight of the top cover assembly is reduced, which is beneficial to improving the battery mass energy density.

[0071] In this embodiment, both the first groove 101 and the second recessed portion 202 are groove structures, which have simple structures, good stability and are easy to process.

[0072] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A top cover assembly, characterized in that: Comprising: A terminal post, on the outer peripheral surface of which a first groove is formed. A cover plate, including a cover plate body and a mounting hole penetrating the cover plate body, the terminal post being inserted through the mounting hole, and a second recessed portion being formed on one side of the cover plate body close to the mounting hole. A sealing assembly, disposed between the cover plate and the terminal post, the sealing assembly having a first protruding portion and a second protruding portion protruding from its surface, the first protruding portion cooperating with the first groove, and the second protruding portion cooperating with the second recessed portion to sealingly connect the terminal post and the cover plate and restrict displacement of the terminal post relative to the cover plate. The first groove includes an annular groove portion and a first recessed portion, the annular groove portion surrounding the terminal post in a circle, and the first recessed portion being located on one side of the annular groove portion close to the center of the terminal post. The number of the first recessed portions is at least two, and at least two of the first recessed portions are circumferentially and equally spaced around the annular groove portion. The dimension of the first recessed portion in the radial direction of the terminal post is H1, where 0 < H1 ≤ 5 mm; the dimension of the first recessed portion in the thickness direction of the terminal post is W1, and the dimension of the first recessed portion in the circumferential direction of the terminal post is L1, where 0 < W1 ≤ L1 ≤ 5 mm and 1 ≤ L1 / W1 ≤ 6; the radian between two adjacent first recessed portions is d1, where π / 30 < d1 ≤ π. The dimension of the annular groove portion in the radial direction of the terminal post is H3, where H1 ≤ H3 ≤ 5 mm; the dimension of the annular groove portion in the thickness direction of the terminal post is W3, where W1 < W3 ≤ 5*W1. The number of the second recessed portions is at least two, and at least two of the second recessed portions are circumferentially arranged around the mounting hole; the second recessed portions are provided on the side wall of the mounting hole. The radian between two adjacent second recessed portions is d2, where π / 30 < d2 ≤ π; the dimension of the second recessed portion in the radial direction of the cover plate body is H2, where 0 < H2 ≤ 5 mm; the dimension of the second recessed portion in the thickness direction of the cover plate body is W2, and the dimension of the second recessed portion in the circumferential direction of the mounting hole is L2, where 0 < W2 ≤ L2 ≤ 4 mm and 1 ≤ L2 / W2 ≤ 6.

2. The top cover assembly according to claim 1, characterized in that: The sealing assembly includes: an upper plastic, which is disposed between the terminal post and the cover plate body, and the first protruding portion and the second protruding portion are formed on the upper plastic to connect with the terminal post and the cover plate.

3. A battery, characterized in that: Comprising: A housing having an open end. A pole group located inside the housing. The top cover assembly according to claim 1 or 2, the top cover assembly being installed at the open end of the housing to seal the housing, and the terminal post of the top cover assembly being electrically connected to the pole group.

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