Top cover assembly and battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a top cover assembly and a battery. The top cover assembly comprises a cover plate and pole assemblies, the top surface part of the cover plate protrudes upwards to form a convex hull capable of being electrically connected with external electric equipment, the convex hull is electrically connected with a tab of the electrode assembly, the cover plate is only provided with one pole assembly and one pole via hole, the pole assemblies are installed on the cover plate in an insulating mode through the pole via holes, and the pole assemblies are arranged on the top surface of the cover plate. The part, located in the pole via hole, of the top surface of the cover plate protrudes upwards to form a flange structure, and after the pole assembly is installed on the cover plate, the flange structure can bend and deform towards the center of the pole via hole, so that the pole assembly is clamped between the cover plate and the flange structure. The terminal post assembly is fixed by using the flange structure, so that the production cost can be effectively reduced, the production process of the top cover assembly is further simplified, the production difficulty is reduced, the quality of a finished product and the use safety can be effectively improved, and higher production requirements are met.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a top cap subassembly and battery. BACKGROUND

[0002] At present, lithium battery is usually provided with two ports, and the two ports are respectively connected with two poles of the external power equipment to realize power supply to the power equipment. However, the structure of the lithium battery with two ports is relatively complex, which affects the assembly efficiency of the lithium battery, and the manufacturing cost is relatively high, which is not conducive to the production and use of the lithium battery.

[0003] The prior art provides a single-port battery top cap and battery. A boss is formed on the top cap sheet, and only one port is provided. The boss is used for electrically connecting with the external power equipment, replaces the original one port of the battery, realizes power supply to the outside, so that the structure of the battery can be simplified, the manufacturing cost is reduced, and the assembly efficiency of the battery is improved. However, the finished product assembly process of the battery top cap is still relatively complex, so that the assembly efficiency and the manufacturing cost of the battery cannot meet higher requirements.

[0004] Therefore, there is an urgent need for a top cap subassembly and battery to solve the problems in the prior art. SUMMARY

[0005] The first object of the utility model is to provide a top cap subassembly, which can further simplify the finished product assembly process, thereby further improving the assembly efficiency and reducing the production cost.

[0006] To achieve the above object, the utility model adopts the following technical scheme:

[0007] The top cap subassembly comprises a cover plate and a pole column assembly. The top surface of the cover plate is upwardly protruded to form a convex envelope capable of electrically connecting with the external power equipment. The convex envelope is electrically connected with the lug of the electrode assembly. Only one pole column assembly and one pole column via hole are provided on the cover plate. The pole column assembly is insulatedly installed on the cover plate through the pole column via hole.

[0008] Furthermore, the top surface of the cover plate is upwardly protruded at the part of the pole column via hole to form a flange structure. After the pole column assembly is installed on the cover plate, the flange structure can be bent and deformed towards the center of the pole column via hole to clamp the pole column assembly between the cover plate and the flange structure.

[0009] Preferably, the outer circumferential surface of the pole column assembly is provided with a rotation-stopping protrusion. The inner side wall surface of the pole column via hole is inwardly recessed to form a rotation-stopping groove. After the pole column assembly is installed in the pole column via hole, the rotation-stopping protrusion is limitedly inserted into the rotation-stopping groove.

[0010] Preferably, the outer circumferential surface of the pole post assembly is circumferentially provided with at least two rotation-stopping protrusions, the inner sidewall surface of the pole post via is circumferentially recessed to form at least two rotation-stopping grooves, and the rotation-stopping protrusions are correspondingly inserted into the rotation-stopping grooves.

[0011] Preferably, a portion of the cover plate located at the pole post via is provided with a sunken groove, an outer edge of an opening of the sunken groove is provided with the flange structure, a groove bottom of the sunken groove is provided with the pole post via, a portion of the pole post assembly passes through the pole post via and is electrically connected with the tab, and another portion of the pole post assembly is located in the sunken groove and is clamped between the flange structure and the groove bottom of the sunken groove.

[0012] Preferably, the pole post assembly comprises a wrapped portion, a passing portion and an insulating rubber member, an outer circumferential surface of the wrapped portion is surrounded by the insulating rubber member, the passing portion is downwardly extended and arranged on a bottom surface of the wrapped portion, and the passing portion passes through the pole post via and is conductively connected with the tab, and the insulating rubber member and the wrapped portion are located in the sunken groove and are clamped between the flange structure and the groove bottom of the sunken groove.

[0013] Preferably, the pole post assembly comprises a conductive column, and the conductive column comprises a copper portion and an aluminum portion connected with each other.

[0014] Alternatively, the conductive column is integrally formed.

[0015] Preferably, a bottom surface of the cover plate is upwardly recessed to form an open groove with an open lower end, and a groove bottom of the open groove is fixedly connected with the tab.

[0016] Preferably, the cover plate is further provided with a liquid injection hole penetrating therethrough, and the liquid injection hole is communicated with the tab.

[0017] The top cover assembly further comprises a lower plastic member, the lower plastic member is fixedly arranged on a lower surface of the cover plate, the lower plastic member is provided with a liquid injection groove, a sidewall of the liquid injection groove is circumferentially provided with at least two liquid injection notches, and the liquid injection hole is communicated with the tab through the liquid injection notches.

[0018] Preferably, a bottom portion of the liquid injection groove is provided with a plurality of liquid injection through holes, and the liquid injection hole is communicated with the tab through the liquid injection notches and the liquid injection through holes.

[0019] The top cover assembly has the beneficial effects that: the pole post assembly is fixed on the cover plate through the flange structure, riveting operation and riveting tools can be directly saved, the flange structure can be formed through simple protrusion processing on the cover plate, after the pole post assembly is installed in the pole post via hole, the flange structure can be deformed through rolling by adopting a conventional rolling edge process, so that the flange structure can press the pole post assembly on the cover plate. In this way, the production cost can be effectively reduced, the production process of the top cover assembly is further simplified, the production difficulty is reduced, and the finished product quality and use safety can be effectively improved, so that higher production requirements can be met.

[0020] The second purpose of the utility model is to provide a battery, which can further simplify the finished product assembly process, thereby further improving assembly efficiency and reducing production cost.

[0021] To achieve the purpose, the utility model adopts the following technical scheme:

[0022] The battery comprises an outer cylinder shell, an electrode assembly and the top cover assembly, the electrode assembly is arranged in the outer cylinder shell, and the top cover assembly sealing cover is arranged at the opening of the outer cylinder shell to package the electrode assembly in the outer cylinder shell.

[0023] The battery has the beneficial effects that: the pole post assembly in the top cover assembly can be fixed and installed on the cover plate without riveting operation and riveting tools, the flange structure can be formed through simple protrusion processing on the cover plate, the production cost can be effectively reduced by fixing the pole post assembly through the flange structure, the production process of the battery is simplified, the production difficulty is reduced, and the finished product quality and use safety of the battery are improved. DRAWINGS

[0024] Figure 1 is a structural schematic view of the top cover assembly provided by the utility model embodiment;

[0025] Figure 2 is an exploded view of the top cover assembly provided by the utility model embodiment;

[0026] Figure 3 is a top view of the top cover assembly provided by the utility model embodiment;

[0027] Figure 4 is a sectional view along A-A in Figure 3

[0028] Figure 5 is a local enlarged view of B in Figure 4

[0029] Figure 6 ​​is a partial structure schematic view of the cover plate provided by the embodiment of the utility model;

[0030] Figure 7 is a structure schematic view of the pole assembly provided by the embodiment of the utility model;

[0031] Figure 8 is a structure schematic view of the cover plate provided by the embodiment of the utility model;

[0032] Figure 9 is a partial structure schematic view of the lower plastic part provided by the embodiment of the utility model.

[0033] In the drawing,

[0034] 1, cover plate;11, convex package;12, pole via hole;13, flange structure;14, sunken groove;141, rotation stopping groove;15, step structure;16, opening groove;17, liquid injection hole;18, pressure relief hole;

[0035] 2, pole assembly;21, conductive column body;2101, wrapped part;2102, crossing part;211, copper part;212, aluminum part;22, insulating rubber part;221, rotation stopping convex;

[0036] 3, lower plastic part;31, liquid injection groove;311, liquid injection gap;312, liquid injection through hole;32, explosion-proof pressure relief through hole;

[0037] 4, explosion-proof valve assembly. DETAILED DESCRIPTION

[0038] The utility model will be further explained in detail below in combination with the drawings and embodiments.It can be understood that the specific embodiments described herein are only used to explain the utility model, and not limit the utility model.In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawing, not all structures.

[0039] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral;It can be mechanical connection, or electrical connection;It can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements or the interaction of two elements.For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0040] In the utility model, unless another definite provision and limitation, first feature is "on" or "under" second feature can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but contact through other feature between them. Moreover, first feature "on", "above" and "upper surface of" second feature includes that first feature is directly above and obliquely above second feature, or only indicates that horizontal height of first feature is higher than second feature. First feature "under", "below" and "under surface of" second feature includes that first feature is directly below and obliquely below second feature, or only indicates that horizontal height of first feature is less than second feature.

[0041] In the description of the embodiment, the terms "upper", "lower", "right", "left" and other orientation or position relationship are based on the orientation or position relationship shown in the drawings, only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second" are only used to distinguish in description, and have no special meaning.

[0042] The utility model provides technical schemes provided by the utility model are introduced below in combination with the accompanying drawings. Figure 1 to the accompanying drawings Figure 9 And specific implementation and introduction of the utility model.

[0043] In combination with Figures 1 to 2 The utility model discloses a top cover assembly, which comprises a cover plate 1 and a pole assembly 2. The top surface of the cover plate 1 is upwardly convex to form a convex bump 11 capable of being conductively connected with an external electrical equipment. The convex bump 11 is electrically connected with a pole lug of the electrode assembly. Only one pole assembly 2 and one pole via hole 12 are arranged on the cover plate 1. The pole assembly 2 is insulatively mounted on the cover plate 1 through the pole via hole 12. It should be noted that in one embodiment of the utility model, the convex bump 11 is electrically connected with a positive pole lug of the electrode assembly and a positive wiring terminal of the external electrical equipment, so that the convex bump 11 is used as a positive pole terminal in a conventional top cover assembly. Correspondingly, the pole assembly 2 in the utility model is used as a negative pole terminal and is connected with a negative wiring terminal of the external electrical equipment.

[0044] It can be understood that in other embodiments, the convex bump 11 can also be electrically connected with a negative pole lug of the electrode assembly and a negative wiring terminal of the external electrical equipment, so that the convex bump 11 is used as a negative pole terminal in a conventional top cover assembly. In this case, the pole assembly 2 is used as a positive pole terminal and is electrically connected with a positive wiring terminal of the external electrical equipment.

[0045] The cover plate 1 provided by the above-mentioned embodiment can effectively simplify the structure of the whole top cover assembly, improve the assembly efficiency of the top cover assembly, reduce the production cost, and is conducive to the production and use of the lithium battery. It should be noted that the top cover assembly provided by the present application can be applied not only to the lithium battery in the embodiment, but also to other types of batteries, such as solid-state batteries, lead-acid batteries, and the like. The present application is not limited in this regard.

[0046] In addition, the connection Figure 2 、 Figure 5 As shown, the top surface of the cover plate 1 in the embodiment is upwardly protruding at the part of the pole post via hole 12 to form a flange structure 13. After the pole post assembly 2 is installed on the cover plate 1, the flange structure 13 can be deformed to the center of the pole post via hole 12 to clamp the pole post assembly 2 between the cover plate 1 and the flange structure 13. Compared with the existing technology of using stamping expansion deformation process to rivet the pole post assembly 2 on the cover plate 1, the riveting operation and the use of riveting tools can be directly omitted, and the flange structure 13 can be formed by simply protruding on the cover plate 1. After the pole post assembly 2 is installed in the pole post via hole 12, the flange structure 13 can be deformed by rolling to press the pole post assembly 2 tightly on the cover plate 1. The riveting method needs additional riveting process and consumables, so using the flange structure 13 to fix the pole post assembly 2 can effectively reduce the production cost, further simplify the production process of the top cover assembly, reduce the production difficulty, and effectively improve the product quality and use safety, meeting higher production requirements.

[0047] Exemplarily, in the embodiment, the part of the cover plate 1 located at the pole post via hole 12 is provided with a sunken groove 14, the cross-sectional shape of the sunken groove 14 is the same as the cross-sectional shape of the pole post assembly 2 and is circular, of course, in other embodiments, the cross-sectional shape of the sunken groove 14 can be square to cooperate with the square pole post assembly 2. In addition, the outer edge of the opening of the sunken groove 14 is provided with the above-mentioned flange structure 13, and the groove bottom of the sunken groove 14 has the above-mentioned pole post via hole 12. In the specific assembly process, part of the pole post assembly 2 passes through the pole post via hole 12 and is electrically connected with the tab, and the other part of the pole post assembly 2 is located in the sunken groove 14 and is clamped between the flange structure 13 and the groove bottom of the sunken groove 14. Through the above-mentioned arrangement, the groove bottom of the sunken groove 14 can support and position the other part of the pole post assembly 2 on the cover plate 1, which can avoid the pole post assembly 2 from sliding off the bottom of the cover plate 1, thereby achieving the effect of limiting the pole post assembly 2 in the vertical direction.

[0048] Specifically, referring to Figure 5As shown, the pole assembly 2 comprises a conductive column 21 and an insulating encapsulating member 22. In one embodiment of the present embodiment, the conductive column 21 is of a split structure and comprises a copper part 211 and an aluminum part 212 connected together. The copper part 211 is formed by punching a copper coil, the aluminum part 212 is formed by punching an aluminum coil, and finally the copper part 211 and the aluminum part 212 are placed in an injection encapsulation mold for encapsulation to form the insulating encapsulating member 22 wrapping and adhering the copper part 211 and the aluminum part 212 together. In addition, the conductive column 21 formed comprises a wrapped part 2101 and a penetrating part 2102. The wrapped part 2101 is surrounded by the insulating encapsulating member 22 on its outer peripheral surface, and the penetrating part 2102 extends downwardly to the bottom surface of the wrapped part 2101 and penetrates through the pole via hole 12 to be conductively connected with the tab. The horizontal cross-sectional dimension of the penetrating part 2102 is smaller than that of the wrapped part 2101, so that after the penetrating part 2102 penetrates through the pole via hole 12, the insulating encapsulating member 22 and the wrapped part 2101 can be limited and accommodated in the sunken groove 14, and finally the flange structure 13 is bent and crimped on the top of the wrapped part 2101, so that the pole assembly 2 can be fixedly installed on the cover plate 1.

[0049] Of course, in other alternative embodiments, the conductive column 21 can also be provided as an integrally formed structure. In specific production and manufacturing, a copper-aluminum composite coil material can be used, and a cold heading technology is adopted to directly cold head the cold headed part, which is then directly placed in an injection encapsulation mold for encapsulation, so as to form the insulating encapsulating member 22 wrapping the conductive column 21 inside.

[0050] Preferably, in the present embodiment, the insulating encapsulating member 22 is made of PPS (polyphenylene sulfide) material. The characteristics of the PPS material make the insulating encapsulating member 22 have excellent electrical insulation and high temperature resistance, which can ensure the electrical insulation between the pole assembly 2 and the cover plate 1, thereby improving the finished product quality of the top cover assembly.

[0051] Further, as shown in Figure 6 , Figure 7 In the present embodiment, a stop rotation groove 141 is formed inwardly on the groove wall of the sunken groove 14 (i.e. on the inner side wall surface of the pole via hole 12), and a stop rotation protrusion 221 is protrudingly provided on the outer peripheral surface of the insulating encapsulating member 22. After the pole assembly 2 is installed in the pole via hole 12, the stop rotation protrusion 221 is limitedly inserted in the stop rotation groove 141, so as to positionally install the pole assembly 2 in the pole via hole 12 through the mutual cooperation of the stop rotation protrusion 221 and the stop rotation groove 141, and limit the circumferential rotation deviation of the pole assembly 2, thereby ensuring the installation accuracy of the pole assembly 2.

[0052] Further, referring to Figure 7As shown, in the embodiment, the outer circumferential surface of the insulating encapsulating member 22 is circumferentially spaced apart with two rotation-stopping protrusions 221, the inner side wall surface of the sunken groove 14 is circumferentially recessed inward to form at least two rotation-stopping grooves 141, and the rotation-stopping protrusions 221 are correspondingly inserted into the rotation-stopping grooves 141, so that the positioning effect of the pole post assembly 2 can be enhanced by increasing the number of the rotation-stopping protrusions 221 and the rotation-stopping grooves 141. Of course, in other parallel embodiments, more than two rotation-stopping protrusions 221 and rotation-stopping grooves 141 can be correspondingly provided to meet the positioning accuracy requirements of pole post assemblies 2 of different specifications, and the utility model is not limited in this regard.

[0053] Further, with reference to Figure 8 As shown, the bottom surface of the cover plate 1 is recessed around the center of the pole post via hole 12 to form a stepped structure 15, and the stepped structure 15 can effectively enhance the structural strength of the part of the cover plate 1 near the pole post via hole 12, so that the deformation of the part of the cover plate 1 near the pole post via hole 12 can be slowed down during the subsequent welding of the tab and the convex bump 11, thereby reducing the risk of performance failure caused by the extrusion deformation of the pole post assembly 2.

[0054] Optionally, in the embodiment, continuing to refer to Figure 8 As shown, the part of the bottom surface of the cover plate 1 aligned with the convex bump 11 is recessed upward to form an open groove 16 with an open lower end, and the open groove 16 is formed by pressing the predetermined position of the cover plate 1 upward during the processing of the cover plate 1 to make the predetermined position of the cover plate 1 arch upward to form the open groove 16, while the convex bump 11 can be formed on the top surface of the cover plate 1. During the entire processing, no additional process or tool is used to form the convex bump 11, so that the overall weight of the cover plate 1 will not be increased, and the production cost and time of the cover plate 1 will not be increased, making the manufacturing process simpler. Further, in the embodiment, the groove bottom of the open groove 16 is fixedly connected with the tab, for example, by welding, so that the convex bump 11 can be directly electrically connected with the tab by omitting the conductive sheet or connecting sheet, thereby further reducing the manufacturing cost of the top cover assembly, further simplifying the structure of the top cover assembly, and avoiding the potential risk of welding failure between the conductive sheet and the cover plate 1 when the conductive sheet is used, so that the connection between the tab and the convex bump 11 is more stable, and the top cover assembly is also safer and more reliable in use.

[0055] Optionally, in the embodiment, the cover plate 1 is further provided with a liquid injection hole 17 penetrating through the cover plate 1, and the liquid injection hole 17 is communicated with the tab; the top cover assembly further comprises a lower plastic member 3 fixedly arranged on the lower surface of the cover plate 1 to insulate and separate the electrode assembly and the cover plate 1. With reference to Figure 9As shown, the lower plastic part 3 is provided with a liquid injection groove 31 corresponding to the position of the liquid injection hole 17, and at least two liquid injection notches 311 are provided on the side wall of the liquid injection groove 31 in the circumferential direction. Preferably, the liquid injection groove 31 is provided with four liquid injection notches 311, and the liquid injection hole 17 is communicated with the tab through the liquid injection notches 311, so that the electrolyte can be uniformly injected into the battery through the four liquid injection notches 311. Through the above arrangement, the four liquid injection notches 311 can jointly disperse the injection pressure of the electrolyte, thereby avoiding the case that the existing lower plastic part 3 is provided with only one liquid injection notch 311 on the liquid injection groove 31, and the opening of the liquid injection notch 311 faces the explosion-proof valve assembly 4, so that the electrolyte with high pressure will impact the explosion-proof valve assembly 4, causing the performance failure of the explosion-proof valve assembly 4. While ensuring the injection speed, the use safety of the top cover assembly is improved.

[0056] Of course, in other parallel embodiments, two, three or more than four liquid injection notches 311 can also be provided on the side wall of the liquid injection groove 31, and the present application is not limited thereto.

[0057] Optionally, in the present embodiment, the top cover assembly further comprises an explosion-proof valve assembly 4, the cover plate 1 is provided with a pressure relief hole 18, and the lower plastic part 3 is provided with an explosion-proof pressure relief through hole 33 aligned with the pressure relief hole 18. When the internal pressure of the battery is too high, the high-pressure gas can break through the explosion-proof valve assembly 4 through the explosion-proof pressure relief through hole 33 and the pressure relief hole 18 to release the internal pressure, thereby avoiding the explosion of the battery and reducing the use risk. Preferably, in the present embodiment, the explosion-proof valve assembly 4 adopts an explosion-proof sheet, and the thickness can be adjusted according to the actual working condition requirements, and the present application is not limited thereto.

[0058] More specifically, continuing to refer to Figure 9 As shown, the bottom of the liquid injection groove 31 is also provided with a plurality of liquid injection through holes 312, the liquid injection hole 17 can be communicated with the tab through the liquid injection notches 311 and the liquid injection through holes 312, the arrangement of the liquid injection through holes 312 helps to improve the efficiency of the electrolyte flowing to the tab, and ensures that the electrolyte can be more evenly distributed on the electrode assembly. In addition, when the internal temperature of the battery rises to cause thermal expansion of the electrolyte, the electrolyte can flow outward through these liquid injection through holes 312, reducing the accumulation of internal pressure of the battery, thereby effectively relieving the impact of the electrolyte on the lower plastic part 3, and avoiding the case that the lower plastic part 3 is deformed or even broken due to the excessive pressure concentrated on the bottom of the liquid injection groove 31.

[0059] The battery also comprises a square outer cylinder, an electrode assembly and the top cover assembly.

[0060] The flange structure 13 can be deformed to the center of the pole post through hole 12 through a conventional rolling edge process, so as to clamp the pole post assembly 2 between the cover plate 1 and the flange structure 13.

[0061] In the description of the present specification, the description referring to the terms "some embodiments", "other embodiments" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description 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.

[0062] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and impossible to enumerate all the implementation modes. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A roof assembly, characterized in that The cover plate (1) and the pole post assembly (2) are provided, the top surface of the cover plate (1) is upwardly protruded to form a convex bump (11) capable of being electrically connected with an external electrical equipment, the convex bump (11) is electrically connected with a tab of the electrode assembly, and only one pole post assembly (2) and one pole post via hole (12) are provided on the cover plate (1), the pole post assembly (2) is insulatively mounted on the cover plate (1) through the pole post via hole (12), The top surface of the cover plate (1) is upwardly protruded at the part of the pole post via hole (12) to form a flange structure (13), after the pole post assembly (2) is mounted on the cover plate (1), the flange structure (13) can be deformed to the center of the pole post via hole (12) to clamp the pole post assembly (2) between the cover plate (1) and the flange structure (13).

2. The roof assembly of claim 1, wherein, The outer circumferential surface of the pole post assembly (2) is provided with a rotation-stopping protrusion (221), the inner side wall surface of the pole post via hole (12) is inwardly recessed to form a rotation-stopping recess (141), and after the pole post assembly (2) is mounted in the pole post via hole (12), the rotation-stopping protrusion (221) is limitingly inserted into the rotation-stopping recess (141).

3. The roof assembly of claim 2, wherein, The outer circumferential surface of the pole post assembly (2) is provided with at least two rotation-stopping protrusions (221) in the circumferential direction, the inner side wall surface of the pole post via hole (12) is inwardly recessed to form at least two rotation-stopping recesses (141) in the circumferential direction, and the rotation-stopping protrusions (221) are one-to-one correspondingly inserted into the rotation-stopping recesses (141).

4. The roof assembly of claim 1, wherein, The part of the cover plate (1) located at the pole post via hole (12) is provided with a sunken groove (14), the opening outer edge of the sunken groove (14) is provided with the flange structure (13), the groove bottom of the sunken groove (14) is provided with the pole post via hole (12), a part of the pole post assembly (2) passes through the pole post via hole (12) and is electrically connected with the tab, and another part of the pole post assembly (2) is located in the sunken groove (14) and is clamped between the flange structure (13) and the groove bottom of the sunken groove (14).

5. The roof assembly of claim 4, wherein, The pole post assembly (2) comprises a wrapped part (2101), a passing part (2102) and an insulating rubber member (22), the outer circumferential surface of the wrapped part (2101) is surrounded by the insulating rubber member (22), the passing part (2102) is downwardly extended and arranged on the bottom surface of the wrapped part (2101) and passes through the pole post via hole (12) to be electrically connected with the tab, and the insulating rubber member (22) and the wrapped part (2101) are located in the sunken groove (14) and are clamped between the flange structure (13) and the groove bottom of the sunken groove (14).

6. The roof assembly of claim 1, wherein, The pole post assembly (2) comprises a conductive column (21), and the conductive column (21) comprises a copper part (211) and an aluminum part (212) connected with each other. Alternatively, the conductive column (21) is integrally formed.

7. The roof assembly of claim 1, wherein, The bottom surface of the cover plate (1) is concave upward in the part aligned with the convex (11), forming an open slot (16) with an open lower end, and the bottom of the open slot (16) is fixedly connected to the tab.

8. The roof assembly of claim 1, wherein, The cover plate (1) is further provided with a liquid injection hole (17) penetrating therethrough, which is communicated with the tab. The top cover assembly further comprises a lower plastic part (3) fixed to the lower surface of the cover plate (1), and the lower plastic part (3) is provided with a liquid injection groove (31), and the side wall of the liquid injection groove (31) is provided with at least two liquid injection notches (311) penetrating in the circumferential direction, and the liquid injection hole (17) is communicated with the tab through the liquid injection notches (311).

9. The roof assembly of claim 8, wherein, The bottom of the liquid injection groove (31) is provided with a plurality of liquid injection through holes (312) penetrating therethrough, and the liquid injection hole (17) is communicated with the tab through the liquid injection notches (311) and the liquid injection through holes (312).

10. A battery characterized by The battery comprises an outer cylinder shell, an electrode assembly and the top cover assembly of any one of claims 1-9, the electrode assembly is arranged in the outer cylinder shell, and the top cover assembly is arranged on the opening of the outer cylinder shell to encapsulate the electrode assembly in the outer cylinder shell.

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