Top cover assembly of battery and battery monomer

Abstract

The utility model discloses a top cover assembly of a battery and a battery monomer, the top cover assembly of the battery comprises: a cover body, which is provided with a through hole; the lower insulation assembly is located on one side of the cover body in the thickness direction and comprises a lower insulation body and a lower insulation insert, a mounting hole opposite to and communicated with the through hole is formed in the lower plastic, and the hole diameter of the mounting hole is larger than that of the through hole; the pole comprises a connecting part and an extending part, the cross sectional area of the connecting part is larger than that of the extending part, the connecting part and the lower insulation assembly are located on the same side of the cover body in the thickness direction, and the extending part penetrates through the mounting hole and the through hole; according to the top cover assembly of the battery disclosed by the utility model, the material performance of the lower insulating insert is changed to meet different requirements of products, and meanwhile, the sealing ring and the lower insulating body do not need to be replaced, so that the cost can be reduced, and the applicability and the universality of the top cover assembly of the battery are also improved.

Description

Technical Field

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

[0002] The top cover of lithium batteries is a core component of safety and sealing, and its performance stability is crucial to the cover assembly. The current cover mainly relies on the compression between the sealing ring and the bare aluminum sheet to achieve sealing. The plastic under the cover is made of plastic material, and its characteristics determine that it shrinks greatly after injection molding. If other materials are replaced, the cost will increase significantly. In addition, the cover will cause pole leakage due to inappropriate compression of the sealing ring. Replacing the sealing ring is not conducive to platform design, and adjusting the lower plastic requires re-opening or repairing the mold, which is costly and has a long cycle. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a battery top cover assembly, which can meet product requirements, does not need to replace the sealing ring and the lower insulating body, can reduce costs, and improves the applicability and versatility of the battery top cover assembly.

[0004] The utility model also provides a battery monomer, comprising the battery top cover assembly.

[0005] According to the embodiment of the utility model, the top cover assembly of the battery includes: a cover body, which has a through hole; a lower insulating assembly, which is located on one side of the cover body in the thickness direction and includes a lower insulating body and a lower insulating insert, and the lower insulating body has a mounting hole opposite to and connected to the through hole, and the aperture of the mounting hole is larger than the aperture of the through hole; a pole, which includes a connecting portion and an extending portion, the cross-sectional area of ​​the connecting portion is larger than the cross-sectional area of ​​the extending portion, the connecting portion and the lower insulating assembly are located on the same side of the cover body in the thickness direction, and the extending portion is penetrated through the mounting hole and the through hole; a sealing ring, which is sleeved outside the extending portion, wherein the lower insulating insert is located in the mounting hole and between the connecting portion and the cover body, and the lower insulating insert is arranged around the extending portion, the radial outer end of the lower insulating insert abuts against the lower insulating body, and the radial inner end of the lower insulating insert abuts against the sealing ring.

[0006] According to the top cover assembly of the battery in the embodiment of the utility model, by setting the cover body, the lower insulating assembly is arranged on one side of the cover body in the thickness direction and includes a lower insulating body and a lower insulating insert, a mounting hole opposite to and connected to the through hole is arranged on the lower insulating body, the extension portion of the pole is passed through the mounting hole and the through hole, the sealing ring is sleeved outside the extension portion, the lower insulating insert is located in the mounting hole, the lower insulating insert is arranged around the extension portion, the radial outer end of the lower insulating insert is abutted against the lower insulating body, and the radial inner end of the lower insulating insert is abutted against the sealing ring, the material properties of the lower insulating insert such as heat resistance, insulation and mechanical properties are changed to meet the different requirements of the products, and there is no need to replace the sealing ring and the lower insulating body, thereby reducing costs and improving the applicability and versatility of the top cover assembly of the battery.

[0007] In some embodiments of the utility model, an end of the inner circumferential wall of the mounting hole close to the cover body has a first limiting protrusion, and the first limiting protrusion extends in a ring shape along the circumferential direction of the mounting hole. An end of the outer circumferential wall of the lower insulating insert facing away from the cover body is provided with a second limiting protrusion, and a surface of the second limiting protrusion facing the cover body stops against a surface of the first limiting protrusion facing away from the cover body.

[0008] In some embodiments of the present invention, the first limiting protrusion extends in a ring shape along the circumferential direction of the mounting hole, and / or the second limiting protrusion extends in a ring shape along the circumferential direction of the lower insulating insert.

[0009] In some embodiments of the present invention, the first limiting protrusions are multiple and spaced apart along the circumferential direction of the mounting hole, and the second limiting protrusions are multiple and matched one by one with the multiple first limiting protrusions.

[0010] In some embodiments of the present invention, the sealing ring includes a first sealing portion and a second sealing portion, the first sealing portion is located between the inner wall of the through hole and the outer peripheral wall of the extension portion, the second sealing portion is connected to an axial end of the first sealing portion, and the second sealing portion and the lower insulating insert are located on the same side in the thickness direction of the cover body and are against the radial inner end of the lower insulating insert.

[0011] In some embodiments of the utility model, the inner circumferential wall of the lower insulating insert has a third limiting protrusion at one end close to the cover body, and the outer circumferential wall of the second sealing portion has a fourth limiting protrusion at one end away from the cover body, and the surface of the third limiting protrusion away from the cover body and the surface of the fourth limiting protrusion facing the cover body are offset from each other.

[0012] In some embodiments of the present invention, the free end surface of the fourth limiting protrusion is spaced apart from the inner peripheral wall of the lower insulating insert.

[0013] In some embodiments of the present invention, a portion of the free end surface of the third limiting protrusion is spaced apart from an outer peripheral wall of the second sealing portion.

[0014] In some embodiments of the present invention, a side of the lower insulating body facing away from the cover body has an annular protrusion, and the annular protrusion is arranged around the connecting portion.

[0015] The battery cell according to the embodiment of the utility model includes the above-mentioned battery top cover assembly.

[0016] According to the battery cell of the embodiment of the utility model, by setting the above-mentioned top cover assembly of the battery, a cover body is set, and the lower insulating assembly is set on one side of the thickness direction of the cover body and includes a lower insulating body and a lower insulating insert. A mounting hole opposite to and connected to the through hole is set on the lower insulating body, and the extension portion of the pole is passed through the mounting hole and the through hole. The sealing ring is sleeved outside the extension portion, and the lower insulating insert is located in the mounting hole. The lower insulating insert is set around the extension portion, and the radial outer end of the lower insulating insert is abutted against the lower insulating body, and the radial inner end of the lower insulating insert is abutted against the sealing ring. The material properties of the lower insulating insert, such as heat resistance, insulation and mechanical properties, are changed to meet different requirements of the products. At the same time, there is no need to replace the sealing ring and the lower insulating body, thereby reducing costs and improving the applicability and versatility of the battery top cover assembly.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a three-dimensional diagram of a top cover assembly of a battery according to an embodiment of the utility model;

[0020] Figure 2 is a cross-sectional view of a top cover assembly of a battery according to an embodiment of the utility model;

[0021] Figure 3 yes Figure 2 The enlarged view of point A in the middle;

[0022] Figure 4 is an exploded view of a top cover assembly of a battery according to an embodiment of the utility model;

[0023] Figure 5 is a partial exploded view of a lower insulating assembly of a top cover assembly of a battery according to an embodiment of the utility model;

[0024] Figure 6 is a partial exploded view of a lower insulating assembly of a top cover assembly of a battery according to an embodiment of the utility model from another perspective;

[0025] Figure 7 is a cross-sectional view of a lower insulating assembly of a top cover assembly of a battery according to an embodiment of the utility model;

[0026] Figure 8 yes Figure 7 The enlarged view of point B in the middle;

[0027] Fig. 9 yes Figure 3 Enlarged view of point C in the middle.

[0028] Reference numerals:

[0029] 10. Top cover assembly of the battery;

[0030] 1. lower insulating assembly; 11. lower insulating body; 111. mounting hole; 112. first limiting protrusion; 113. annular protrusion; 12. lower insulating insert; 121. second limiting protrusion; 122. third limiting protrusion;

[0031] 2. Sealing ring; 21. First sealing part; 22. Second sealing part; 221. Fourth limiting protrusion;

[0032] 3. Cover body; 31. Through hole;

[0033] 4. Pole; 41. Connecting portion; 42. Extending portion;

[0034] 5. Apply plastic;

[0035] 6. Connect the blocks. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0037] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Reference below Figure 1-Figure 9 A top cover assembly 10 of a battery according to an embodiment of the present invention is described.

[0040] like Figure 1-Figure 3 As shown, the top cover assembly 10 of the battery according to the embodiment of the utility model includes: a cover body 3, a lower insulating assembly 1, a pole 4 and a sealing ring 2.

[0041] Specifically, Figure 4-Figure 6 As shown, the cover body 3 has a through hole 31, the lower insulating component 1 is located on one side of the cover body 3 in the thickness direction and includes a lower insulating body 11 and a lower insulating insert 12, the lower insulating body 11 has a mounting hole 111 opposite to and connected to the through hole 31, the aperture of the mounting hole 111 is larger than the aperture of the through hole 31, the pole 4 includes a connecting portion 41 and an extending portion 42, the cross-sectional area of ​​the connecting portion 41 is larger than the cross-sectional area of ​​the extending portion 42, the connecting portion 41 and the lower insulating component 1 are located on the same side of the cover body 3 in the thickness direction, the extending portion 42 is penetrated in the mounting hole 111 and the through hole 31, and the sealing ring 2 is sleeved outside the extending portion 42.

[0042] It is understandable that the cover body 3 is used to protect the internal structure of the battery cell, such as the battery cell, the connection portion 41 of the pole 4 is used to connect to the battery cell, and the extension portion 42 of the pole 4 is inserted through the through hole 31 and the mounting hole 111, so as to facilitate the current in the battery cell to be led out of the battery cell. Since the cover body 3 has a high structural strength and is mostly made of metal parts with conductivity, it is necessary to set a lower insulating component 1 between the connection portion 41 and the cover body 3 to achieve insulation between the connection portion 41 and the cover body 3, thereby reducing the risk of leakage. The sealing ring 2 is sleeved outside the extension portion 42, so as to reduce the leakage of electrolyte in the battery cell, thereby improving the sealing and increasing the safety of the battery cell.

[0043] Among them, when the heat resistance, insulation performance and mechanical properties of the lower insulating body 11 cannot meet the product requirements, the heat resistance, insulation performance and mechanical properties can be increased by changing the material of the lower insulating insert 12, so that the heat resistance, insulation performance and mechanical properties of the lower insulating component 1 meet the product requirements. Since the material cost of better heat resistance, insulation performance and mechanical properties is higher, compared with the lower insulating component which only includes the lower insulating body, and increases the heat resistance, insulation performance and mechanical properties by changing the material of the lower insulating body to meet the product requirements, the cost of the lower insulating component 1 is lower.

[0044] For example, the improvement of heat resistance can reduce the heating of the pole 4 and the melting of the lower insulating component 1, thereby meeting the product's requirements for heat resistance. The improvement of insulation performance can reduce the breakdown of the lower insulating component 1, thereby reducing the risk of leakage, thereby meeting the product's requirements for insulation performance. The improvement of mechanical properties can reduce the deformation of the lower insulating component 1 and improve the product's precision, thereby meeting the product's requirements for mechanical properties.

[0045] Preferably, the material properties of the lower insulating insert 12, such as heat resistance, insulation and mechanical properties, are better than those of the lower insulating body 11. For example, the lower insulating body 11 is made of PP (Polypropylene), and the lower insulating insert 12 can be made of gum resin or insulating alloy material, so that the overall performance of the lower insulating component 1 can meet product requirements and save costs.

[0046] Furthermore, if Figure 3 , Figure 5 and Figure 6 As shown, the lower insulating insert 12 is located in the mounting hole 111 and between the connecting portion 41 and the cover body 3 . The lower insulating insert 12 is arranged around the extension portion 42 . The radial outer end of the lower insulating insert 12 abuts against the lower insulating body 11 , and the radial inner end of the lower insulating insert 12 abuts against the sealing ring 2 .

[0047] Therefore, the radial outer end of the lower insulating insert 12 is abutted against the lower insulating body 11, and the radial inner end of the lower insulating insert 12 is abutted against the sealing ring 2, which improves the installation stability and reliability between the lower insulating insert 12, the lower insulating body 11 and the sealing ring 2. At the same time, the connecting parts such as bolts and nuts between the lower insulating insert 12 and the lower insulating body 11 are reduced, thereby making the structure simple and easy to install.

[0048] In addition, when the sealing effect of the sealing ring 2 does not meet the product requirements (i.e., electrolyte leakage will occur), the overall sealing effect of the battery top cover assembly 10 can meet the product requirements (i.e., no electrolyte leakage) by changing the size and mechanical properties (stiffness and toughness) of the lower insulating insert 12. There is no need to replace the sealing ring 2 or the lower insulating body 11, thereby further reducing costs.

[0049] Therefore, by changing the material properties of the lower insulating insert 12 such as heat resistance, insulation and mechanical properties, the product requirements can be met without replacing the sealing ring 2 and the lower insulating body 11, thereby reducing costs and improving the applicability and versatility of the battery top cover assembly 10.

[0050] Furthermore, if Figure 1-Figure 3 As shown, one end of the extension portion 42 away from the connecting portion 41 is connected to the connecting block 6, thereby facilitating the electrical output of the battery cell. There is also an upper plastic 5 between the connecting block 6 and the cover body 3 for insulation between the cover body 3 and the connecting block 6, thereby further reducing the risk of leakage and improving the safety of the battery cell.

[0051] Furthermore, if Figure 1-Figure 4 As shown, there are two poles 4, namely a positive pole and a negative pole. The positive pole is connected to the positive pole of the battery cell, and the negative pole is connected to the negative pole of the battery cell, thereby achieving electrical connection with external equipment.

[0052] According to the top cover assembly 10 of the battery of the embodiment of the utility model, by setting the cover body 3, the lower insulating assembly 1 is set on one side of the thickness direction of the cover body 3 and includes a lower insulating body 11 and a lower insulating insert 12, and a mounting hole 111 opposite to and connected with the through hole 31 is set on the lower insulating body 11, the extension portion 42 of the pole 4 is penetrated in the mounting hole 111 and the through hole 31, the sealing ring 2 is sleeved outside the extension portion 42, the lower insulating insert 12 is located in the mounting hole 111, and the lower insulating insert 12 is set around the extension portion 42, the radial outer end of the lower insulating insert 12 is against the lower insulating body 11, and the radial inner end of the lower insulating insert 12 is against the sealing ring 2, the material properties of the lower insulating insert 12 such as heat resistance, insulation and mechanical properties are changed to meet the different requirements of the product, and there is no need to replace the sealing ring 2 and the lower insulating body 11, thereby reducing costs and improving the applicability and versatility of the top cover assembly 10 of the battery.

[0053] In some embodiments of the present invention, Figure 3 and Figure 4-Figure 8 As shown, the end of the inner circumferential wall of the mounting hole 111 close to the cover body 3 has a first limiting protrusion 112, and the first limiting protrusion 112 extends in a ring shape along the circumferential direction of the mounting hole 111. The end of the outer circumferential wall of the lower insulating insert 12 away from the cover body 3 is provided with a second limiting protrusion 121, and the surface of the second limiting protrusion 121 facing the cover body 3 stops at the surface of the first limiting protrusion 112 away from the cover body 3.

[0054] It can be understood that by the surface of the second limiting protrusion 121 facing the cover body 3 and the surface of the first limiting protrusion 112 facing away from the cover body 3, the movement of the lower insulating insert 12 toward the cover body 3 can be limited, thereby improving the installation stability and reliability of the lower insulating insert 12. In addition, the connecting parts such as bolts and nuts between the lower insulating insert 12 and the lower insulating body 11 are reduced, thereby making the structure simple and easy to install.

[0055] In some embodiments of the present invention, Figure 5 and Figure 6 As shown, the first limiting protrusion 112 extends in a ring shape along the circumferential direction of the mounting hole 111, and the second limiting protrusion 121 extends in a ring shape along the circumferential direction of the lower insulating insert 12. Thus, the first limiting protrusion 112 and the second limiting protrusion 121 can stop reliably, thereby further improving the installation stability and reliability of the lower insulating insert 12.

[0056] In some embodiments of the present invention, there are a plurality of first limiting protrusions 112 spaced apart along the circumferential direction of the mounting hole 111 , and there are a plurality of second limiting protrusions 121 matched one-to-one with the plurality of first limiting protrusions 112 .

[0057] As a result, the first limiting protrusion 112 and the second limiting protrusion 121 can be reliably stopped, thereby further improving the installation stability and reliability of the lower insulating insert 12. In addition, the plurality of first limiting protrusions 112 are spaced apart along the circumferential direction of the mounting hole 111, so that gaps are formed between adjacent first limiting protrusions 112, thereby reducing the amount of consumables of the lower insulating body 11, and similarly, reducing the amount of consumables of the lower insulating insert 12, thereby further reducing the cost of the battery top cover assembly 10.

[0058] In some embodiments of the present invention, Figure 3 As shown, the sealing ring 2 includes a first sealing portion 21 and a second sealing portion 22. The first sealing portion 21 is located between the inner wall of the through hole 31 and the outer peripheral wall of the extension portion 42, so as to achieve insulation between the pole 4 and the cover body 3, and at the same time avoid leakage of the electrolyte, thereby improving the safety of the battery cell.

[0059] Furthermore, if Figure 3 As shown, the second sealing portion 22 is connected to one axial end of the first sealing portion 21, and the second sealing portion 22 and the lower insulating insert 12 are located on the same side in the thickness direction of the cover body 3 and abut against the radial inner end of the lower insulating insert 12. As a result, the lower insulating insert 12 and the sealing ring 2 are relatively fixed, thereby improving the installation stability and reliability between the lower insulating insert 12 and the sealing ring 2, and at the same time, it can prevent the electrolyte from leaking from the gap between the lower insulating insert 12 and the sealing ring 2, thereby improving the sealing performance of the top cover assembly 10 of the battery.

[0060] In some embodiments of the present invention, Figure 2 , Figure 3 , Figure 7 and Figure 8 As shown, the end of the inner peripheral wall of the lower insulating insert 12 close to the cover body 3 has a third limiting protrusion 122, and the end of the outer peripheral wall of the second sealing portion 22 away from the cover body 3 has a fourth limiting protrusion 221, and the surface of the third limiting protrusion 122 away from the cover body 3 and the surface of the fourth limiting protrusion 221 facing the cover body 3 are abutted against each other.

[0061] It can be understood that an interlocking structure is formed by the surface of the third limiting protrusion 122 facing away from the cover body 3 and the surface of the fourth limiting protrusion 221 facing the cover body 3. That is, the fourth limiting protrusion 221 limits the movement of the third limiting protrusion 122 in the direction away from the cover body 3, and the third limiting protrusion 122 limits the movement of the fourth limiting protrusion 221 in the direction of the cover body 3, thereby improving the installation stability and reliability between the lower insulating insert 12 and the sealing ring 2, and reducing the connecting parts such as bolts and nuts between the lower insulating insert 12 and the sealing ring 2, thereby making the structure simple and easy to install.

[0062] In some embodiments of the present invention, Figure 2 , Figure 3 , Figure 7 and Figure 8 As shown, the free end face (radially inner end face) of the fourth limiting protrusion 221 is spaced from the inner circumferential wall of the lower insulating insert 12. As a result, a portion of the escape space is reserved for the lower insulating insert 12, which can avoid installation interference between the fourth limiting protrusion 221 and the lower insulating insert 12. At the same time, the consumable amount of the lower insulating insert 12 or the sealing ring 2 can be reduced, further reducing the cost of the battery top cover assembly 10. At the same time, a deformation space for the sealing ring 2 can be reserved, which can be beneficial to the deformation of the sealing ring 2, avoid the sealing ring 2 from being subjected to too much pressure, and improve the durability of the sealing ring 2.

[0063] In some embodiments of the present invention, Figure 2 , Figure 3 , Figure 7 , Figure 8 and Fig. 9 As shown, the free end surface (radially inner end surface) of the third limiting protrusion 122 is spaced from the outer peripheral wall of the second sealing portion 22. Thus, the installation interference between the third limiting protrusion 122 and the second sealing portion 22 can be avoided, and at the same time, the consumable amount of the lower insulating insert 12 or the sealing ring 2 can be reduced, further reducing the cost of the battery top cover assembly 10. In addition, it can be beneficial to the deformation of the sealing ring 2, avoiding the sealing ring 2 from being subjected to too much pressure, and improving the durability of the sealing ring 2.

[0064] In some embodiments of the present invention, Figure 3 and Figure 5 As shown, the side of the lower insulating body 11 facing away from the cover body 3 has an annular protrusion 113, and the annular protrusion 113 is arranged around the connecting portion 41. Therefore, by providing the annular protrusion 113, the movement of the pole 4 and the lower insulating insert 12 along the radial direction of the mounting hole 111 is better restricted, and the installation stability and installation reliability of the pole 4 and the lower insulating insert 12 are improved.

[0065] A battery cell according to an embodiment of the present invention is described below.

[0066] The battery cell according to the embodiment of the present invention includes the above-mentioned battery top cover assembly 10 .

[0067] According to the battery cell of the embodiment of the utility model, by setting the top cover assembly 10 of the above-mentioned battery, the cover body 3 is set, the lower insulating assembly 1 is set on one side of the thickness direction of the cover body 3 and includes a lower insulating body 11 and a lower insulating insert 12, and a mounting hole 111 opposite to and connected to the through hole 31 is set on the lower insulating body 11, the extension portion 42 of the pole 4 is penetrated in the mounting hole 111 and the through hole 31, the sealing ring 2 is sleeved outside the extension portion 42, the lower insulating insert 12 is located in the mounting hole 111, and the lower insulating insert 12 is set around the extension portion 42, the radial outer end of the lower insulating insert 12 is against the lower insulating body 11, and the radial inner end of the lower insulating insert 12 is against the sealing ring 2, the material properties of the lower insulating insert 12 such as heat resistance, insulation and mechanical properties are changed to meet the different requirements of the product, and there is no need to replace the sealing ring 2 and the lower insulating body 11, thereby reducing costs and improving the applicability and versatility of the top cover assembly 10 of the battery.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0069] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A top cover assembly of a battery, characterized in that: include: A cover body, wherein the cover body has a through hole; A lower insulating component, the lower insulating component is located on one side of the cover body in the thickness direction and includes a lower insulating body and a lower insulating insert, the lower insulating body has a mounting hole opposite to and connected to the through hole, and the aperture of the mounting hole is larger than the aperture of the through hole; A pole, the pole comprising a connecting portion and an extending portion, the cross-sectional area of ​​the connecting portion is larger than the cross-sectional area of ​​the extending portion, the connecting portion and the lower insulating assembly are located on the same side of the cover body in the thickness direction, and the extending portion is penetrated in the mounting hole and the through hole; A sealing ring, wherein the sealing ring is sleeved outside the extension portion, The lower insulating insert is located in the mounting hole and between the connecting portion and the cover body, the lower insulating insert is arranged around the extension portion, the radial outer end of the lower insulating insert abuts against the lower insulating body, and the radial inner end of the lower insulating insert abuts against the sealing ring.

2. The top cover assembly of the battery according to claim 1, characterized in that: The inner circumferential wall of the mounting hole has a first limiting protrusion at one end close to the cover body, and the first limiting protrusion extends in a ring shape along the circumferential direction of the mounting hole. The outer circumferential wall of the lower insulating insert has a second limiting protrusion at one end facing away from the cover body, and the surface of the second limiting protrusion facing the cover body abuts against the surface of the first limiting protrusion facing away from the cover body.

3. The top cover assembly of the battery according to claim 2, characterized in that: The first limiting protrusion extends in a ring shape along the circumferential direction of the mounting hole, and / or the second limiting protrusion extends in a ring shape along the circumferential direction of the lower insulating insert.

4. The top cover assembly of the battery according to claim 2, characterized in that: The first limiting protrusions are multiple and spaced apart along the circumferential direction of the mounting hole, and the second limiting protrusions are multiple and matched with the multiple first limiting protrusions one by one.

5. The top cover assembly of the battery according to claim 1, characterized in that: The sealing ring includes a first sealing portion and a second sealing portion, the first sealing portion is located between the inner wall of the through hole and the outer peripheral wall of the extension portion, the second sealing portion is connected to an axial end of the first sealing portion, and the second sealing portion and the lower insulating insert are located on the same side in the thickness direction of the cover body and are against the radial inner end of the lower insulating insert.

6. The top cover assembly of the battery according to claim 5, characterized in that: The inner circumferential wall of the lower insulating insert has a third limiting protrusion at one end close to the cover body, and the outer circumferential wall of the second sealing portion has a fourth limiting protrusion at one end away from the cover body, and the surface of the third limiting protrusion away from the cover body and the surface of the fourth limiting protrusion facing the cover body are abutted against each other.

7. The top cover assembly of the battery according to claim 6, characterized in that: The free end surface of the fourth limiting protrusion is spaced apart from the inner peripheral wall of the lower insulating insert.

8. The top cover assembly of the battery according to claim 6, characterized in that: A portion of the free end surface of the third limiting protrusion is spaced apart from the outer peripheral wall of the second sealing portion.

9. The top cover assembly of the battery according to claim 1, characterized in that: A side of the lower insulating body facing away from the cover body has an annular protrusion, and the annular protrusion is arranged around the connecting portion.

10. A battery cell, characterized in that: A top cover assembly comprising a battery according to any one of claims 1-9.

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