Cover plate assembly and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a cover plate assembly and a battery. The cover plate assembly comprises a cover plate body which is provided with a mounting through hole; the pole column assembly comprises a first pole column and a second pole column, the first pole column comprises a main body plate and a convex part, the main body plate is arranged on the inner side of the cover plate body, the convex part is inserted into the mounting through hole, and the second pole column is connected with the convex part and extends out of the outer side of the cover plate body; the first insulating part is arranged on the outer side of the cover plate body and annularly arranged on the pole assembly; the second insulating part is arranged on the inner side of the cover plate body; the sealing element is clamped between the pole assembly and the side wall of the mounting through hole; the first end of the fixing structural part is connected with the cover plate body, the second end of the fixing structural part is embedded in the first insulating part, and the projection of the second end on the cover plate body and the projection of the pole assembly on the cover plate body have an overlapped area. The fixing structure of the cover plate assembly and the pole assembly is reliable, and the pole assembly can be prevented from falling off under the action of external force.

Description

Technical Field

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

[0002] The pole is a structure used to realize the electrical connection between the battery cell and external components such as the busbar, and is usually installed on the cover plate. Specifically, a mounting through hole is set on the cover plate, and the pole passes through the mounting through hole and one end is located inside the battery and connected to the pole ear or adapter, and the other end is located outside the battery. In the existing cover plate assembly, the reliability of the pole fixing structure is poor, and the pole is easy to fall out of the mounting through hole under the pulling of external force, which not only affects the life of the battery, but also causes safety hazards.

[0003] Therefore, there is an urgent need for a cover plate assembly and a battery to solve the above technical problems. Utility Model Content

[0004] One purpose of the utility model is to provide a cover plate assembly, which can play a good limiting role on the pole assembly through the cooperation between the main plate of the pole assembly located on the inner side of the cover plate body and the cover plate, and the cooperation between the fixed structural member located on the outer side of the cover plate body and the pole assembly, so as to prevent the pole assembly from falling off under the action of external force.

[0005] Another object of the utility model is to provide a battery, which has good structural strength, good safety and long service life by providing the above-mentioned cover plate assembly.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] Cover assembly, including:

[0008] A cover plate body, on which a mounting through hole is provided;

[0009] A pole assembly, comprising a first pole and a second pole;

[0010] A first insulating member, disposed on the outer side of the cover body and arranged around the pole assembly;

[0011] A second insulating member is disposed on the inner side of the cover body;

[0012] A sealing member, partially sandwiched between the pole assembly and the side wall of the mounting through hole;

[0013] The fixing structure comprises a first end, a second end, and a main body, wherein the first end is extended radially from an end of the main body close to the cover body toward the axis of the mounting through hole to form an annular clamping protrusion;

[0014] An annular groove is arranged on the outer side of the cover body, the bottom of the annular protrusion abuts against the bottom of the annular groove, and the first side wall of the annular protrusion abuts against the first side wall of the annular groove.

[0015] A projection of the second end on the cover body and a projection of the pole assembly on the cover body have an overlapping area.

[0016] As an optional solution, the first pole includes a main body plate and a protrusion, the main body plate is arranged on the inner side of the cover body, the protrusion is inserted into the mounting through hole, and the second pole is connected to the protrusion and extends to the outside of the cover body.

[0017] As an optional solution, the main body is embedded in the first insulating member and is ringed on the second pole, the first end is connected to one end of the main body close to the cover body and is located outside the first insulating member, the second end is connected to one end of the main body away from the cover body and is located in the first insulating member, and the second end is formed by extending the main body toward the axis of the mounting through hole.

[0018] As an optional solution, a locking portion is formed on the side wall of the annular groove close to the axis of the mounting through hole. Along the axial direction of the mounting through hole, the locking portion is located at one end of the annular groove close to the outer side of the cover body, and the locking portion presses against the surface of the annular bulge facing the outer side of the cover body.

[0019] As an optional solution, the second pole includes a pole body and a boss portion, the pole body is connected to the boss portion, and the boss portion is connected to the circumference of the pole body and is located outside the cover plate body;

[0020] A projection of the boss portion on the cover body and a projection of the second end on the cover body have an overlapping area.

[0021] As an optional solution, the boss portion is arranged around the outer circumference of the column body, the second end is arranged around the second pole, and the maximum outer diameter of the boss portion is greater than the minimum inner diameter of the second end.

[0022] As an optional scheme, one end of the inner wall of the mounting through hole close to the inner side of the cover body radially protrudes to form a step portion, and the step portion and the second end are respectively located on both sides of the boss portion along the axial direction, and the projection of the boss portion on the cover body has an overlapping area with the step portion.

[0023] As an optional solution, the sealing member includes:

[0024] A first sealing portion, radially sandwiched between the protruding portion and the inner wall of the mounting through hole;

[0025] The second sealing portion is axially sandwiched between the second pole and the end surface of the step portion facing the outer side of the cover plate body.

[0026] As an optional solution, a blocking portion is provided on a side of the first insulating member facing the cover plate body, and the blocking portion is inserted into the mounting through hole and abuts against a circumferential surface of the second sealing portion.

[0027] A battery comprises a shell, a battery cell and the cover plate assembly, wherein one side of the shell has an opening, the battery cell is arranged in the shell, the cover plate assembly blocks the opening, and the electrode ear of the battery cell is electrically connected to the first electrode column.

[0028] The beneficial effects of the utility model are:

[0029] The cover plate assembly of the utility model forms a main plate with the first pole of the pole assembly, and the main plate is located inside the cover plate body, so that the cover plate body plays an axial limiting role on the pole assembly, thereby preventing the pole assembly from falling from the mounting through hole; in addition, by providing a fixed structure connected to the cover plate body, and making the projection of the second end of the fixed structure on the cover plate body coincide with the projection of the pole assembly on the cover plate body, the fixed structure further limits the pole assembly axially. The cover plate assembly in this embodiment can play a dual limiting role on the pole assembly through the cooperation of the main plate located inside the cover plate body and the cover plate body, and the cooperation of the fixed structure located outside the cover plate body and the pole assembly, thereby preventing the pole assembly from falling off under the action of external force, thereby improving the structural firmness of the cover plate assembly.

[0030] The battery of the utility model has good structural strength, good safety and long service life by arranging the cover plate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a battery provided by a specific embodiment of the utility model;

[0032] Figure 2 It is an exploded view of a cover plate assembly provided in a specific embodiment of the utility model;

[0033] Figure 3 It is a top view of the cover plate assembly provided in a specific embodiment of the utility model;

[0034] Figure 4 yes Figure 3 AA section view in;

[0035] Figure 5 yes Figure 4The enlarged view of point B in the figure;

[0036] Figure 6 It is a schematic diagram of a fixed structural member provided in a specific embodiment of the utility model;

[0037] Figure 7 It is a cross-sectional view of a fixed structural member provided in a specific embodiment of the utility model;

[0038] Figure 8 The cover plate provided by the specific embodiment of the utility model is Figure 4 Schematic diagram of the first structure at B in FIG.

[0039] Fig. 9 The cover plate provided by the specific embodiment of the utility model is Figure 4 Schematic diagram of the second structure at B in FIG.

[0040] In the figure:

[0041] 10. Cover plate assembly;

[0042] 11. Cover plate body; 111. Mounting through hole; 112. Step portion; 113. Annular groove; 114. Locking portion; 1141. First mating surface; 115. Liquid injection hole; 1151. First through hole; 1152. Second through hole; 116. Explosion-proof hole;

[0043] 12, pole assembly; 121, first pole; 1211, main body plate; 1212, raised portion; 122, second pole; 1221, pole body; 1222, boss portion;

[0044] 13. First insulating member; 131. Sealing portion; 132. Insulating body;

[0045] 14. A second insulating member; 141. An avoidance hole;

[0046] 15. sealing member; 151. first sealing portion; 152. second sealing portion;

[0047] 16. Fixed structure; 161. First end; 1611. Second mating surface; 162. Second end; 163. Main body;

[0048] 17. Explosion-proof components; 171. Explosion-proof disks; 172. Protective films;

[0049] 20. Shell. DETAILED DESCRIPTION

[0050] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0051] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0053] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0054] This embodiment provides a cover plate assembly and a battery. In this embodiment, the battery is a square shell battery. Figure 1 As shown, the battery includes a shell 20, a battery cell and a cover assembly 10. The shell 20 is a roughly rectangular cavity structure and has an opening on one side. The opening is used to install the battery cell inside the shell 20. The cover assembly 10 is connected to the shell 20 and seals the opening of the shell 20, thereby ensuring the sealing of the battery.

[0055] like Figure 1 and Figure 2As shown, the cover plate assembly 10 includes a cover plate body 11 and two pole assemblies 12. The cover plate body 11 is a flat plate-shaped component and is rectangular in structure. Two mounting through holes 111 are provided on the cover plate body 11. In this embodiment, the two mounting through holes 111 are arranged at intervals along the length direction of the cover plate body 11. The battery cell includes two pole ears with opposite polarities. One end of the pole assembly 12 is arranged on the inner side of the cover plate body 11 and is electrically connected to the pole ear corresponding to the polarity. The other end of the pole assembly 12 extends out of the mounting through hole 111 to facilitate connection with components such as the busbar outside the battery, thereby realizing current conduction between the battery cell and the external structure. In some embodiments, the pole ear is directly welded to the pole assembly 12 with the same polarity. In some embodiments, the pole ear is first welded to the adapter, and then welded to the pole assembly 12 with the same polarity through the adapter. It should be noted that, in this embodiment, the inner side of the cover body 11 refers to the side of the cover body 11 facing the inside of the housing 20, that is, the side of the cover body 11 facing the battery cell. The outer side of the cover body 11 refers to the side of the cover body 11 facing the outside of the battery, that is, the side of the cover body 11 away from the battery cell.

[0056] like Figure 2-Figure 5 As shown, the cover plate assembly 10 also includes a first insulating member 13, a second insulating member 14 and a sealing member 15. Among them, the first insulating member 13 is arranged on the outside of the cover plate body 11 and is arranged around the pole assembly 12. In this embodiment, two first insulating members 13 are provided, and each first insulating member 13 is correspondingly arranged around a pole assembly 12. The second insulating member 14 is arranged in the battery and fits the inner surface of the cover plate body 11. In this embodiment, one second insulating member 14 is provided, and is constructed as a plate member that matches the shape and size of the cover plate body 11. The first insulating member 13 and the second insulating member 14 are used to achieve an insulating connection between the pole assembly 12 and the cover plate body 11. Optionally, the first insulating member 13 and the second insulating member 14 can both be plastic parts. The sealing member 15 is sleeved on the pole assembly 12 and partially sandwiched between the pole assembly 12 and the hole wall of the mounting through hole 111. The sealing member 15 is used to achieve a sealed connection between the pole assembly 12 and the cover plate to prevent battery leakage.

[0057] like Figure 1 and Figure 2As shown, the cover body 11 is also provided with an injection hole 115, which is used to inject electrolyte into the battery housing 20 so that the battery cell is immersed in the electrolyte to realize the charging and discharging function of the battery cell. In this embodiment, the axis of the injection hole 115 is arranged perpendicular to the cover body 11. The injection hole 115 includes a first through hole 1151 and a second through hole 1152 that are connected. The first through hole 1151 and the second through hole 1152 are coaxially arranged, and the first through hole 1151 is arranged close to the outer side of the cover body 11, and the second through hole 1152 is arranged close to the outer side of the cover body 11. The aperture of the first through hole 1151 is larger than the aperture of the second through hole 1152, so that the shape of the injection hole 115 is similar to a countersunk hole. After the injection is completed, the first through hole 1151 can be plugged with a sealing rubber plug, and a metal sheet can be installed in the second through hole 1152 and welded to ensure the sealing performance of the battery.

[0058] like Figure 1 and Figure 2 As shown, the cover assembly 10 also includes an explosion-proof assembly 17, which is mounted on the cover body 11. When the air pressure inside the battery reaches a preset value, the explosion-proof assembly 17 ruptures to release the pressure of the battery in a directional manner, thereby preventing the air pressure inside the housing 20 from being too high and eventually causing the battery to explode, thereby improving the safety of the battery. Figure 2 As shown, the cover body 11 is provided with an explosion-proof hole 116, and the explosion-proof assembly 17 includes an explosion-proof plate 171. The explosion-proof plate 171 is installed at the explosion-proof hole 116 and blocks the explosion-proof hole 116, thereby ensuring the sealing of the battery. Optionally, the explosion-proof plate 171 is connected to the cover body 11 by welding. A weak area is provided on the explosion-proof plate 171. When the internal air pressure of the battery rises to a preset value, the weak area will rupture first, thereby preventing the entire explosion-proof plate 171 from falling off the cover body 11, thereby improving the safety of the battery. In some embodiments, the weak area is a notch. In this embodiment, the specific shape of the notch can be a runway shape, a circle, a square, etc., which is not specifically limited here. In some embodiments, the weak area can be directly thinned locally by mechanical processing, chemical etching, etc. In this embodiment, the shape of the weak area can be flexibly set as needed. As Figure 2 As shown, the explosion-proof component 17 also includes a protective film 172, which is installed at the explosion-proof hole 116 and is located on the outside of the explosion-proof plate 171. The protective film 172 helps to protect the explosion-proof plate 171, not only to prevent the explosion-proof plate 171 from rupturing and failing due to external pressure from the battery, but also to prevent external foreign matter from being deposited in the weak area of ​​the explosion-proof plate 171, causing the explosion-proof plate 171 to fail.

[0059] In the prior art, the fixing structure of the pole assembly 12 has poor reliability. Under the pulling of external force, the pole assembly 12 is easy to come out of the mounting through hole 111, which not only affects the life of the battery, but also causes safety hazards.

[0060] In this regard, Figure 2-Figure 5 As shown, the pole assembly 12 includes a first pole 121 and a second pole 122, and the first pole 121 and the second pole 122 are arranged along the axial direction of the mounting through hole 111. The first pole 121 includes a main plate 1211 and a protrusion 1212. Among them, the main plate 1211 is arranged on the inner side of the cover body 11, and the main plate 1211 is against the side of the second insulating member 14 away from the cover body 11, and the second insulating member 14 can prevent the first pole 121 from being connected to the cover body 11. The protrusion 1212 is arranged on the side of the main plate 1211 facing the cover body 11 and inserted into the mounting through hole 111. The second pole 122 is connected to the protrusion 1212 and extends to the outside of the cover body 11, so as to facilitate connection with components such as the busbar outside the battery. The cover plate assembly 10 also includes a fixed structure member 16. Along the axial direction of the mounting through hole 111, the two ends of the fixed structure member 16 are respectively a first end 161 and a second end 162. The first end 161 is connected to the cover plate body 11, and the second end 162 is embedded in the first insulating member 13. The projection of the second end 162 on the cover plate body 11 and the projection of the pole assembly 12 on the cover plate body 11 have an overlapping area, so the second end 162 can axially limit the pole assembly 12.

[0061] In the cover plate assembly 10 of the present embodiment, on the one hand, the main plate 1211 of the pole assembly 12 is located on the inner side of the cover plate body 11, so the cover plate body 11 plays an axial limiting role on the pole assembly 12, preventing the pole assembly 12 from falling from the mounting through hole 111; on the other hand, the fixed structure 16 is connected to the cover plate body 11, and the projection of the second end 162 of the fixed structure 16 on the cover plate body 11 coincides with the projection of the pole assembly 12 on the cover plate body 11, that is, the fixed structure 16 can further axially limit the pole assembly 12. In other words, the cover plate assembly 10 can play a dual limiting role on the pole assembly 12 through the cooperation of the main plate 1211 located on the inner side of the cover plate body 11 and the cover plate body 11, and the cooperation of the fixed structure 16 located on the outer side of the cover plate body 11 and the pole assembly 12, thereby preventing the pole assembly 12 from falling off under the action of external force, thereby improving the structural firmness of the cover plate assembly 10. The battery of this embodiment has good structural strength, good safety and long service life by providing the above-mentioned cover plate assembly 10.

[0062] In this embodiment, the pole assembly 12 includes two components, a first pole 121 and a second pole 122. During installation, the first pole 121 and the second pole 122 can be respectively brought close to each other from the inner and outer sides of the cover body 11 and inserted into the installation through hole 111 for connection, thereby improving the convenience of installing the pole assembly 12 on the cover body 11. The raised portion 1212 provided on the second pole 122 facilitates the connection between the first pole 121 and the second pole 122. Optionally, the raised portion 1212 can be formed by mechanical pressing.

[0063] Regarding the installation of the fixing structure 16 , in some embodiments, the first end 161 of the fixing structure 16 and the pole assembly 12 may be respectively installed on the cover body 11 , and then the first insulating member 13 may be formed around the second pole 122 by casting.

[0064] like Figure 2 and Figure 5 As shown, the second pole 122 includes a pole body 1221 and a boss portion 1222, and the pole body 1221 is connected to the boss portion 1212. The boss portion 1222 is connected to the circumferential surface of the pole body 1221 and is located outside the cover body 11. The projection of the boss portion 1222 on the cover body 11 and the projection of the second end 162 of the fixing structure 16 on the cover body 11 have an overlapping area, that is, the second end 162 of the fixing structure 16 can limit the boss portion 122 on the second pole 122. At this time, the cover body 11 plays an axial limiting role on the first pole 121, and the second end 162 of the fixing structure 16 plays an axial limiting role on the second pole 122, which not only improves the overall installation reliability of the pole assembly 12, but also prevents the second pole 122 from falling off the cover body 11 when the connection between the first pole 121 and the second pole 122 is disconnected.

[0065] Optionally, the first pole 121 and the second pole 122 can be connected by riveting. Specifically, one of the sides of the pole body 1221 and the protrusion 1212 facing each other is provided with a blind hole, and the other is provided with a protrusion, and the protrusion is riveted into the blind hole to achieve a fixed connection between the first pole 121 and the second pole 122. In other embodiments, the pole body 1221 and the protrusion 1212 can also be fixedly connected by welding, clamping, etc., which is not specifically limited here. Figure 2 As shown, two avoidance holes 141 are provided on the second insulating member 14 . The two avoidance holes 141 are respectively arranged opposite to the two installation through holes 111 . The avoidance holes 141 are used to avoid the installation of the protrusion 1212 of the first pole 121 .

[0066] In this embodiment, Figure 2 and Figure 5As shown, the boss portion 1222 is arranged in an annular manner on the outer periphery of the column body 1221, and the second end 162 of the fixed structure 16 is arranged in an annular manner on the second pole 122. The maximum outer diameter of the boss portion 1222 is greater than the minimum inner diameter of the second end 162 of the fixed structure 16. Such an arrangement can not only satisfy the axial limiting effect of the fixed structure 16 on the second pole 122, but also when the pole assembly 12 is pulled by external force, the fixed structure 16 can limit the second pole 122 uniformly along the circumferential direction, thereby further improving the firmness of the connection of the pole assembly 12.

[0067] like Figure 5-Figure 7 As shown, the fixing structure 16 also includes a main body 163, which is used to realize the connection between the first end 161 and the second end 162. Specifically, the main body 163 is embedded in the first insulating member 13 and is arranged around the second pole 122, and the main body 163 is constructed as a cylindrical structure. The first end 161 is connected to an end of the main body 163 close to the cover body 11, and is located outside the first insulating member 13, so that the first end 161 is connected to the cover body 11. The second end 162 is connected to an end of the main body 163 away from the cover body 11 and is arranged in the first insulating member 13. The second end 162 is formed by the main body 163 extending toward the axis of the mounting through hole 111. In other words, the first end 161, the main body 163, and the second end 162 are arranged in sequence along the axial direction of the mounting through hole 111, and the three are coaxially arranged. In this embodiment, the plane where the second end 162 is located is arranged parallel to the cover body 11, so as to facilitate processing. Optionally, the fixing structure 16 may be made of plastic material, metal material or other materials with high structural strength, which is not specifically limited herein.

[0068] like Figure 5 As shown, one end of the inner wall of the mounting through hole 111 close to the inner side of the cover body 11 protrudes radially to form a step portion 112, and the step portion 112 and the first end 161 are respectively located on both sides of the boss portion 1222 along the axial direction, and the projection of the boss portion 1222 on the cover body 11 has an overlapping area with the step portion 112. In other words, the step portion 112 on the cover body 11 can limit the second pole 122 along the axial direction. Since the step portion 112 is located on the inner side of the boss portion 1222, it can prevent the second pole 122 from sinking into the battery under the pressure of external force and being unable to connect with external busbars and other components, further improving the reliability of the installation structure of the pole assembly 12.

[0069] Preferably, if Figure 5As shown, the first insulating member 13 includes an insulating body 132 and a blocking portion 131. The insulating body 132 abuts against the surface of the cover body 11 facing outward, and the fixing structure 16 is embedded in the insulating body 132. The blocking portion 131 is protrudingly arranged on the side of the insulating body 132 facing the cover body 11. The blocking portion 131 is inserted into the mounting through hole 111 and abuts against the circumferential surface of the sealing member 15. By providing the blocking portion 131 on the first insulating member 13, not only can the second pole 122 be prevented from contacting with the cover body 11 to insulate the two, but also the sealing effect of the matching position of the pole assembly 12 and the mounting through hole 111 is improved. It should be noted that the blocking portion 131 is an annular structure, so that the mounting through hole 111 can be tightly blocked and reliable insulation between the second pole 122 and the cover body 11 can be ensured.

[0070] like Figure 5 As shown, the seal 15 is an annular structure, and the seal 15 includes a first sealing portion 151 and a second sealing portion 152 arranged along the axial direction of the mounting through hole 111. The first sealing portion 151 is sandwiched between the protrusion 1212 and the inner wall of the mounting through hole 111 in the radial direction, and the second sealing portion 152 is sandwiched between the second pole 122 and the end surface of the step portion 112 facing the outside of the cover body 11 in the axial direction. The arrangement of the first sealing portion 151 and the second sealing portion 152 can not only ensure the sealing of the matching position of the pole assembly 12 and the mounting through hole 111, but also the first sealing portion 151 can play an insulating role between the first pole 121 and the cover body 11, and the second sealing portion 152 can play an insulating role between the second pole 122 and the cover body 11. In this embodiment, the maximum outer diameter of the second sealing portion 152 is greater than the maximum outer diameter of the first sealing portion 151, thereby ensuring that the circumferential surface of the second sealing portion 152 can be offset against the blocking portion 131 of the first insulating member 13, thereby improving the sealing effect. Optionally, the first sealing portion 151 and the second sealing portion 152 are integrally formed, which not only has a good sealing effect but also is easy to assemble. In some embodiments, the first sealing portion 151 and the second sealing portion 152 can also be made into separate structures, which facilitates the separate processing and manufacturing of the first sealing portion 151 and the second sealing portion 152. Both the first sealing portion 151 and the second sealing portion 152 can be made of rubber material.

[0071] like Figure 5 and Figure 8As shown, an annular groove 113 is provided on the outer side of the cover body 11, and the annular groove 113 is arranged around the installation through hole 111. The first end 161 of the fixing structure 16 is constructed as an annular convex, and is formed by extending radially toward the axis of the installation through hole 111 at one end of the main body 163 close to the cover body 11. The annular convex is plugged and matched with the annular groove 113, that is, the surface of the annular convex is fitted with the surface of the annular groove 113, the bottom of the annular convex is in contact with the bottom of the annular groove 113, and the first side wall of the annular convex is in contact with the first side wall of the annular groove 113. It can be understood that the first side wall of the annular convex refers to the side wall of the annular convex away from the pole assembly 12, and the first side wall of the annular groove 113 refers to the side wall of the annular groove 113 away from the pole assembly 12.

[0072] On the one hand, the cooperation between the annular clamping protrusion and the annular clamping groove 113 makes the connection between the fixing structure 16 and the cover body 11 tighter and more sealed; on the other hand, when the pole assembly 12 is pulled by external force, the boss portion 1222 exerts a force on the second end 162. At this time, the first end 161 extending toward the axis of the mounting through hole 111 will further have a tendency to deform toward the axis of the mounting through hole 111. This tendency makes the annular clamping protrusion and the cover body 11 more tightly clamped, avoiding excessive external force from pulling down the connecting fixing together.

[0073] like Figure 5 and Figure 8 As shown, a locking portion 114 is formed on the side wall of the annular groove 113 close to the axis of the mounting through hole 111. Along the axial direction of the mounting through hole 111, the locking portion 114 is located at one end of the annular groove 113 close to the outer side of the cover body 11. The locking portion 114 presses against the surface of the annular protrusion toward the outer side of the cover body 11. The locking portion 114 serves as a stop and limit for the annular protrusion, thereby improving the reliability of the connection between the fixed structure 16 and the cover body 11.

[0074] In some embodiments, such as Figure 8 As shown, the surface of the locking portion 114 facing the bottom of the annular groove 113 is a first mating surface 1141, and the first mating surface 1141 is an inclined surface. In the direction away from the axis of the mounting through hole 111, the distance between the first mating surface 1141 and the bottom of the annular groove 113 gradually increases. Correspondingly, a second mating surface 1611 is provided on the first end 161 of the fixing structure 16, and the second mating surface 1611 is an inclined surface that fits the first mating surface 1141. The provision of the first mating surface 1141 and the second mating surface 1611 makes the connection between the fixing structure and the cover body 11 more convenient.

[0075] In some embodiments, such as Fig. 9As shown, the surface of the locking portion 114 facing the bottom of the annular groove 113 is a first mating surface 1141, which is parallel to the cover body 11 and abuts against the top surface of the annular protrusion. The first mating surface 1141 parallel to the cover body 11 and the mating with the fixing structure 16 make the connection between the fixing structure 16 and the cover body 11 more reliable.

[0076] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not intended to limit the implementation methods of the utility model. For ordinary technicians in the field, according to the idea of ​​the utility model, there will be changes in the specific implementation methods and application scopes, and the content of this specification should not be understood as limiting the utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the utility model should be included in the protection scope of the claims of the utility model.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate body (11) having a mounting through hole (111) disposed thereon; A pole assembly (12) comprising a first pole (121) and a second pole (122); A first insulating member (13) is arranged outside the cover plate body (11) and is arranged around the pole assembly (12); A second insulating member (14) is arranged inside the cover body (11); A sealing member (15) partially sandwiched between the pole assembly (12) and a side wall of the mounting through hole (111); A fixing structure (16) comprising a first end (161), a second end (162), and a main body (163), wherein the first end (161) extends radially from an end of the main body (163) close to the cover body (11) toward the axis of the mounting through hole (111) to form an annular convex protrusion; An annular clamping groove (113) is provided on the outer side of the cover plate body (11), the bottom of the annular clamping protrusion abuts against the bottom of the annular clamping groove (113), and the first side wall of the annular clamping protrusion abuts against the first side wall of the annular clamping groove (113); The projection of the second end (162) on the cover body (11) and the projection of the pole assembly (12) on the cover body (11) have an overlapping area.

2. The cover plate assembly according to claim 1, characterized in that: The first pole (121) comprises a main body plate (1211) and a protrusion (1212); the main body plate (1211) is arranged on the inner side of the cover plate body (11); the protrusion (1212) is inserted into the mounting through hole (111); and the second pole (122) is connected to the protrusion (1212) and extends to the outside of the cover plate body (11).

3. The cover plate assembly according to claim 1, characterized in that: The main body (163) is embedded in the first insulating member (13) and is arranged around the second pole (122); the first end (161) is connected to an end of the main body (163) close to the cover body (11) and is located outside the first insulating member (13); the second end (162) is connected to an end of the main body (163) away from the cover body (11) and is located inside the first insulating member (13); the second end (162) is formed by extending the main body (163) toward the axis of the mounting through hole (111).

4. The cover plate assembly according to claim 1, characterized in that: A locking portion (114) is formed on the side wall of the annular groove (113) close to the axis of the mounting through hole (111); along the axial direction of the mounting through hole (111), the locking portion (114) is located at one end of the annular groove (113) close to the outer side of the cover plate body (11); the locking portion (114) presses against the surface of the annular convex facing the outer side of the cover plate body (11).

5. The cover plate assembly according to claim 2, characterized in that: The second pole (122) comprises a pole body (1221) and a boss portion (1222), the pole body (1221) being connected to the convex portion (1212), and the boss portion (1222) being connected to the circumferential surface of the pole body (1221) and being located outside the cover plate body (11); The projection of the boss portion (1222) on the cover plate body (11) and the projection of the second end (162) on the cover plate body (11) have an overlapping area.

6. The cover plate assembly according to claim 5, characterized in that: The boss portion (1222) is arranged around the outer periphery of the column body (1221), and the second end (162) is arranged around the second pole (122). The maximum outer diameter of the boss portion (1222) is greater than the minimum inner diameter of the second end (162).

7. The cover plate assembly according to claim 6, characterized in that: One end of the inner wall of the mounting through hole (111) close to the inner side of the cover plate body (11) protrudes radially to form a step portion (112), and the step portion (112) and the second end (162) are respectively located on both sides of the boss portion (1222) along the axial direction, and the projection of the boss portion (1222) on the cover plate body (11) has an overlapping area with the step portion (112).

8. The cover plate assembly according to claim 7, characterized in that: The sealing member (15) comprises: A first sealing portion (151) is radially sandwiched between the protruding portion (1212) and the inner wall of the mounting through hole (111); The second sealing portion (152) is axially sandwiched between the second pole (122) and the end surface of the step portion (112) facing the outside of the cover plate body (11).

9. The cover plate assembly according to claim 8, characterized in that: A blocking portion (131) is provided on one side of the first insulating member (13) facing the cover plate body (11); the blocking portion (131) is inserted into the mounting through hole (111) and abuts against the peripheral surface of the second sealing portion (152).

10. A battery, characterized in that It comprises a shell (20), a battery cell and a cover plate assembly according to any one of claims 1 to 9, wherein one side of the shell (20) has an opening, the battery cell is arranged in the shell (20), the cover plate assembly blocks the opening, and the electrode ear of the battery cell is electrically connected to the first pole (121).

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