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, a pole component, an insulating component, a sealing element and a fixing component, wherein a mounting through hole is formed in the cover plate body; the pole assembly is mounted in the mounting through hole; the insulation assembly comprises a first insulation part and a second insulation part, the first insulation part is arranged on the outer side of the cover plate body and arranged around the pole assembly in a surrounding mode, and the second insulation part is arranged on the inner side of the cover plate body; the sealing part is partially arranged between the inner wall of the mounting through hole and the pole assembly; the fixing assembly comprises a main body part and a first fixing part and a second fixing part which are connected to the two ends of the main body part respectively, the first fixing part is connected with the cover plate body in a clamped mode, the second fixing part is connected with the first insulating part, and the extending directions of the first fixing part and the second fixing part are opposite. According to the cover plate assembly, the condition that the pole component is separated from the mounting through hole under the action of a relatively large external force can be avoided, and the service life of the battery can be prolonged.

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] With the rapid development of science and technology, electronic products are becoming more and more popular, from smart phones, tablets to electric cars. Batteries are the core power source of these devices, and their performance and safety are directly related to the overall performance and user experience of the product. The poles on the battery cover are the key components for connecting the battery to external devices, so their stability is particularly important. However, the poles on the cover in the prior art can easily fall out of the pole mounting holes under the pull of external forces, which not only affects the life of the battery, but also causes safety hazards.

[0003] Therefore, it is urgent to propose a cover plate assembly to solve the above problems. Utility Model Content

[0004] The utility model aims to provide a cover plate assembly and a battery, which can prevent the pole from coming out of the pole mounting hole under the action of a large external force, and can prolong the service life of the battery and ensure its safety during use.

[0005] As conceived above, the technical solution adopted by the utility model is:

[0006] A cover plate assembly, comprising:

[0007] A cover plate body, on which a mounting through hole is provided;

[0008] A pole assembly, mounted in the mounting through hole;

[0009] An insulating component, comprising a first insulating member and a second insulating member, wherein the first insulating member is arranged on the outer side of the cover body and is arranged around the pole assembly, and the second insulating member is arranged on the inner side of the cover body;

[0010] A sealing member, partially disposed between the inner wall of the mounting through hole and the pole assembly;

[0011] The fixing assembly includes a main body and a first fixing part and a second fixing part respectively connected to both ends of the main body, the first fixing part is clamped and connected to the cover body, the second fixing part is connected to the first insulating member, and the first fixing part and the second fixing part extend in opposite directions.

[0012] As a preferred solution of the cover plate assembly provided by the utility model, the projection of the second fixing portion on the cover plate body and the projection of the pole assembly on the cover plate body have an overlapping area.

[0013] As a preferred solution of the cover plate assembly provided by the utility model, a snap-fit ​​groove is provided on the cover plate body, and the first fixing portion is snap-fitted into the snap-fit ​​groove.

[0014] As a preferred solution of the cover plate assembly provided by the utility model, the main body is an annular structure, the first fixing portion is an annular flange structure provided on the main body and extending in the radial direction of the mounting through hole in a direction away from the pole assembly, and the clamping groove is an annular groove arranged around the mounting through hole; or

[0015] The main body is an annular structure, the first fixing portion includes a plurality of snap-in protrusions arranged at intervals along the circumference of the main body, and each of the snap-in protrusions extends along the radial direction of the mounting through hole in a direction away from the pole assembly, and the snap-in groove includes a plurality of sub-slots corresponding one-to-one to the snap-in protrusions.

[0016] As a preferred solution of the cover assembly provided by the utility model, a limiting portion is provided on the groove wall of the snap-in groove along the radial direction of the mounting through hole away from the mounting through hole, and the limiting portion can be pressed against the surface of the first fixing portion facing the outer side of the cover body.

[0017] As a preferred solution of the cover assembly provided by the utility model, the surface of the limiting portion facing the bottom of the snap-in groove is a first mating surface, the first mating surface is a plane or an arc surface, and the first fixing portion is provided with a second mating surface that fits with the first mating surface.

[0018] As a preferred solution of the cover plate assembly provided by the utility model, the pole assembly includes:

[0019] A first pole piece, comprising a main body plate and a protrusion, wherein the main body plate is arranged on the inner side of the cover body, and the protrusion is inserted into the mounting through hole;

[0020] The second pole piece is connected to the protruding portion and extends to the outside of the cover plate body.

[0021] As a preferred solution of the cover plate assembly provided by the utility model, the sealing member includes:

[0022] A first sealing portion, sandwiched between the peripheral side of the second pole member and the inner wall of the mounting through hole;

[0023] The second sealing portion is connected to the first sealing portion and is sandwiched between the bottom of the second pole piece and the inner wall of the mounting through hole.

[0024] As a preferred solution of the cover assembly provided by the utility model, the pole assembly is an integrated structure, and the pole assembly includes a pole body and a protrusion arranged on the outer peripheral side of the pole body, the pole body passes through the mounting through hole, and the protrusion is located between the cover body and the second fixing part.

[0025] The utility model also provides a battery, comprising a shell, a battery cell and the cover plate assembly as described above, 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 pole ear of the battery cell is electrically connected to the pole column assembly of the cover plate assembly.

[0026] The beneficial effects of the utility model are:

[0027] The utility model provides a cover plate assembly, which realizes an insulating connection between a pole assembly and a cover plate body by cooperation of a first insulating member and a second insulating member, thereby ensuring safety during use; a sealing member is provided to realize a sealed connection between the pole assembly and the cover plate body, thereby avoiding battery leakage; a fixing member is provided to improve the connection strength between the first insulating member and the cover plate body, and to limit the pole assembly in the axial direction, thereby avoiding the pole assembly from coming out of the mounting through hole under the action of a large external force, and to extend the service life of the battery, thereby ensuring safety during use; in addition, by providing the first fixing portion and the second fixing portion with opposite extension directions, the processing of the fixing assembly can be facilitated, the processing technology can be simplified, and the processing efficiency can be improved.

[0028] The utility model also provides a battery, which has high structural strength, good safety and long service life by applying the cover plate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of a battery provided by an embodiment of the utility model;

[0030] Figure 2 It is an exploded schematic diagram of a cover plate assembly provided by an embodiment of the utility model;

[0031] Figure 3 is a top view schematic diagram of a cover plate assembly provided by an embodiment of the utility model;

[0032] Figure 4 yes Figure 3 A partial cross-sectional schematic diagram of

[0033] Figure 5 It is a structural schematic diagram of a fixing assembly provided in an embodiment of the utility model;

[0034] Figure 6 is a cross-sectional schematic diagram of a fixing assembly provided in an embodiment of the utility model;

[0035] Figure 7 It is a cross-sectional schematic diagram of the cover plate body provided by an embodiment of the utility model;

[0036] Figure 8 yes Figure 7 A partial enlarged view at point B.

[0037] In the figure:

[0038] 100, cover assembly; 200, housing;

[0039] 110, cover body; 111, mounting through hole; 112, clamping groove; 113, limit portion; 1131, first matching surface; 114, injection hole; 1141, first injection through hole; 1142, second injection through hole; 115, explosion-proof hole;

[0040] 120, pole assembly; 121, first pole piece; 1211, main body plate; 1212, raised portion; 122, second pole piece; 1221, pole body; 1222, boss portion;

[0041] 130, insulating assembly; 131, first insulating member; 132, second insulating member; 1321, perforation; 1322, plug-in portion;

[0042] 140, sealing member; 141, first sealing portion; 142, second sealing portion;

[0043] 150, fixing assembly; 151, first fixing portion; 1511, second mating surface; 152, second fixing portion; 153, main body;

[0044] 160. Explosion-proof component; 161. Explosion-proof disk; 162. Protective film. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships 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.

[0049] Figure 1 FIG. 2 shows a schematic diagram of the structure of the battery provided in this embodiment. Figure 1 As shown, this embodiment provides a battery, which includes a housing 200, a battery cell (not shown in the figure) and a cover assembly 100. One side of the housing 200 has an opening, the battery cell is arranged in the housing 200, and the cover assembly 100 is sealed in the opening of the housing 200 to ensure the sealing of the battery. In this embodiment, the battery is a square shell battery. The housing 200 is roughly a rectangular cavity structure with an opening at one end, and the battery cell can be placed into the inner cavity of the housing 200 from the opening of the housing 200.

[0050] Figure 2 FIG. 1 shows an exploded schematic diagram of the cover plate assembly 100 provided in this embodiment. Figure 2 Combined with Figure 1As shown, this embodiment also provides a cover assembly 100, which includes a cover body 110 and two pole assemblies 120. The cover body 110 is blocked at the opening of the shell 200. Two mounting through holes 111 are provided on the cover body 110, and the two mounting through holes 111 are arranged at intervals along the length direction of the cover body 110; the two pole assemblies 120 are respectively installed in the two mounting through holes 111. Specifically, the battery cell includes two pole ears with opposite polarities, and each pole ear corresponds to a pole assembly 120; one end of the pole assembly 120 is arranged on the inner side of the cover body 110 and is electrically connected to the pole ear corresponding to the polarity, and the other end of the pole assembly 120 extends from the mounting through hole 111 to facilitate connection with components such as a 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 120 with the same polarity. In other embodiments, the pole ear is first welded to the adapter plate, and then the adapter plate is used to achieve welding connection with the pole assembly 120 with the same polarity as the pole ear.

[0051] It should be noted that, in this embodiment, the inner side of the cover body 110 refers to the side of the cover body 110 facing the inside of the housing 200, that is, the side of the cover body 110 facing the battery cell. The outer side of the cover body 110 refers to the side of the cover body 110 facing the outside of the battery, that is, the side of the cover body 110 facing away from the battery cell.

[0052] Figure 3 FIG. 1 is a schematic top view of the cover plate assembly 100 provided in this embodiment. Figure 4 Shows Figure 3 A partial cross-sectional view of Figure 3-Figure 4 Combined with Figure 2 As shown, the cover assembly 100 further includes an insulating component 130 and a sealing component 140. The insulating component 130 includes a first insulating component 131 and a second insulating component 132. The first insulating component 131 is arranged on the outside of the cover body 110 and is arranged around the pole assembly 120. The second insulating component 132 is arranged on the inside of the cover body 110. The first insulating component 131 and the second insulating component 132 cooperate to achieve an insulating connection between the pole assembly 120 and the cover body 110. The sealing component 140 is partially arranged between the inner wall of the mounting through hole 111 and the pole assembly 120 to achieve a sealed connection between the pole assembly 120 and the cover body 110 to prevent battery leakage.

[0053] In the related art, the pole assembly 120 is easily pulled out of the mounting hole 111 by external force, which not only affects the life of the battery but also causes safety hazards. Figure 2 and Figure 4As shown, the cover plate assembly 100 further includes a fixing assembly 150, which includes a main body 153 and a first fixing portion 151 and a second fixing portion 152 respectively connected to both ends of the main body 153, the first fixing portion 151 is connected to the cover plate body 110, the second fixing portion 152 is connected to the first insulating member 131, and the first fixing portion 151 and the second fixing portion 152 extend in opposite directions. The setting of the fixing assembly 150 can improve the connection strength between the first insulating member 131 and the cover plate body 110, and can limit the pole assembly 120 in the axial direction to prevent the pole assembly 120 from being disengaged from the mounting through hole 111 under the action of a large external force, and can extend the service life of the battery and ensure its safety during use; in addition, by setting the first fixing portion 151 and the second fixing portion 152 to have opposite extending directions, the processing of the fixing assembly 150 can be facilitated, the processing technology can be simplified, and the processing efficiency can be improved.

[0054] In this embodiment, the first fixing portion 151 extends in a direction closer to the pole assembly 120 relative to the main body portion 153 , and the second fixing portion 152 extends in a direction away from the pole assembly 120 relative to the main body portion 153 .

[0055] Optionally, the projection of the second fixing portion 152 on the cover body 110 and the projection of the pole assembly 120 on the cover body 110 have an overlapping area. This design can further improve the limiting effect of the fixing assembly 150 on the pole assembly 120 in the axial direction.

[0056] To achieve a stable connection between the fixing assembly 150 and the cover body 110 , in this embodiment, a snap-fit ​​groove 112 is provided on the cover body 110 , and the first fixing portion 151 is snap-fitted into the snap-fit ​​groove 112 . The snap-fitting fixation has the advantages of convenient assembly and tight connection.

[0057] Figure 5 A schematic structural diagram of the fixing assembly 150 provided in this embodiment is shown. Figure 6 FIG. 1 is a cross-sectional schematic diagram of the fixing assembly 150 provided in this embodiment. Figure 5-Figure 6 Combined with Figure 4As shown, in some embodiments, the main body 153 is an annular structure, the first fixing portion 151 is an annular flange structure provided on the main body 153 and extending in a direction away from the pole assembly 120, and the clamping groove 112 is an annular groove provided around the mounting through hole 111, which has a simple structure and is convenient for processing. In other embodiments, the main body 153 is an annular structure, the first fixing portion 151 includes a plurality of clamping protrusions arranged at intervals along the circumference of the main body 153, and each clamping protrusion extends in a direction away from the pole assembly 120, and the clamping groove 112 includes a plurality of sub-clamping grooves corresponding to the clamping protrusions one by one, and this design can also achieve the above-mentioned effect. When assembling the first fixing portion 151 and the cover body 110, the snap-fitting protrusions need to be snap-fitted into the corresponding snap-fitting grooves one by one. Therefore, this design will increase the difficulty of assembly. However, this design can save materials for the fixing component 150 and reduce material costs. Therefore, in actual production, designers can choose any of the above-mentioned structures of the fixing component 150 according to actual needs, and this embodiment does not limit this.

[0058] Optionally, the first fixing portion 151, the second fixing portion 152 and the main body 153 are an integrated structure, which can save the steps of assembling the first fixing portion 151, the second fixing portion 152 and the main body 153, improve processing efficiency, and prevent the fixing assembly 150 from breaking at the connection between the first fixing portion 151 and the main body 153 or between the second fixing portion 152 and the main body 153 when the pole assembly 120 is subjected to a large external force, further improving the connection strength between the fixing assembly 150 and the cover plate body 110 and the first insulating member 131. Optionally, the fixing assembly 150 can be made of metal material or other materials with high structural strength, which is not specifically limited here.

[0059] Figure 7 A cross-sectional schematic diagram of the cover plate body 110 provided in this embodiment is shown. Figure 8 Shows Figure 7 A partial enlarged view at B. Figure 7-Figure 8 Combined with Figure 4 As shown, a limiting portion 113 is provided on the slot wall of the clamping slot 112 on the side away from the mounting through hole 111 along the radial direction of the mounting through hole 111, and the limiting portion 113 can press against the surface of the first fixing portion 151 facing the outside of the cover plate body 110. The limiting portion 113 can limit the first fixing portion 151 in the axial direction of the pole assembly 120, further ensure the tight fit between the first fixing portion 151 and the clamping slot 112, and prevent the pole assembly 120 from coming out of the mounting through hole 111 when subjected to a large external force.

[0060] like Figure 4 , Figure 6 as well as Figure 8As shown, in some embodiments, the surface of the limiting portion 113 facing the bottom of the snap-fit ​​groove 112 is a first mating surface 1131, and the first mating surface 1131 is an inclined surface. Along the direction away from the axis of the mounting through hole 111, the distance between the first mating surface 1131 and the bottom of the snap-fit ​​groove 112 gradually decreases. Correspondingly, a second mating surface 1511 is provided on the first fixing portion 151, and the second mating surface 1511 is an inclined surface that fits the first mating surface 1131. The provision of the first mating surface 1131 and the second mating surface 1511 makes the connection between the first fixing portion 151 and the cover body 110 more convenient. In other embodiments, the first mating surface 1131 and the second mating surface 1511 can also be a planar structure parallel to the outer side surface of the cover body 110. In some other embodiments, the first mating surface 1131 and the second mating surface 1511 may also be arcuate structures that fit each other. This embodiment does not limit the specific shapes of the first mating surface 1131 and the second mating surface 1511, and designers can adjust them according to actual needs.

[0061] like Figure 4 and Figure 6 As shown, in some embodiments, the main body 153 is a straight cylindrical structure with a regular structure, which is convenient for processing and assembly. Of course, in some other embodiments, the main body 153 can also be a conical cylindrical structure, that is, along the direction from the second fixing portion 152 to the first fixing portion 151, the main body 153 gradually tilts away from the axial direction of the installation through hole 111.

[0062] In this embodiment, the second fixing portion 152 is embedded in the first insulating member 131, which is easy to process and has a tight connection. When installing the fixing assembly 150, the first fixing portion 151 and the pole assembly 120 can be installed on the cover body 110 respectively, and then the first insulating member 131 is formed on the periphery of the pole assembly 120 by casting.

[0063] Continue as Figure 2 and Figure 4 As shown, the pole assembly 120 includes a first pole piece 121 and a second pole piece 122. The first pole piece 121 includes a main plate 1211 and a protrusion 1212. The main plate 1211 is arranged on the inner side of the cover body 110, and the protrusion 1212 is inserted into the mounting through hole 111. The second pole piece 122 is connected to the protrusion 1212 and extends to the outer side of the cover body 110. With this arrangement, the main plate 1211 can limit the first pole piece 121 in the axial direction thereof, and cooperate with the fixing assembly 150 to prevent the pole assembly 120 from falling off under the action of external force, further improving the structural firmness of the cover assembly 100.

[0064] In this embodiment, the first pole member 121 and the second pole member 122 are split structures. During installation, the first pole member 121 and the second pole member 122 can be approached and inserted into the mounting through hole 111 from the inner and outer sides of the cover body 110 and connected, which improves the convenience of installing the pole assembly 120 on the cover body 110. The raised portion 1212 provided on the second pole member 122 facilitates the connection between the first pole member 121 and the second pole member 122. Optionally, the raised portion 1212 can be formed by mechanical pressing. Of course, in other embodiments, the pole assembly 120 can also be set as an integrated structure. Specifically, the pole assembly 120 includes a pole body and a protrusion arranged on the outer peripheral side of the pole body, the pole body passes through the mounting through hole 111, and the protrusion is located between the cover body 110 and the second fixing portion 152. Compared with the split pole assembly 120, this arrangement can save the steps of assembling the pole assemblies 120 with each other, and the assembly efficiency is higher.

[0065] Optionally, the second pole member 122 includes a pole body 1221 and a boss portion 1222, wherein the boss portion 1222 is connected to the circumference of the pole body 1221 and is located outside the cover body 110. The projection of the boss portion 1222 on the cover body 110 and the projection of the second fixing portion 152 on the cover body 110 have an overlapping area, that is, the second fixing portion 152 can limit the boss portion 122 on the second pole member 122. At this time, the cover body 110 plays an axial limiting role on the first pole member 121, and the second fixing portion 152 plays an axial limiting role on the second pole member 122, which not only improves the overall installation reliability of the pole assembly 120, but also prevents the second pole member 122 from falling off the cover body 110 when the connection between the first pole member 121 and the second pole member 122 is disconnected.

[0066] The first pole member 121 and the second pole member 122 can be connected by riveting. Specifically, in the sides of the column body 1221 and the protrusion 1212 facing each other, one 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 the fixed connection between the first pole member 121 and the second pole member 122. In other embodiments, the column body 1221 and the protrusion 1212 can also be fixedly connected by welding, clamping, etc., which is not specifically limited here.

[0067] In this embodiment, the boss portion 1222 is arranged in an annular manner on the outer periphery of the column body 1221, and the second fixing portion 152 is arranged in an annular manner on the second pole piece 122. The maximum outer diameter of the boss portion 1222 is greater than the minimum inner diameter of the second fixing portion 152. Such an arrangement can not only satisfy the axial limiting effect of the fixing component 150 on the second pole piece 122, but also when the pole piece 120 is pulled by external force, the fixing component 150 can limit the second pole piece 122 uniformly along the circumferential direction, thereby further improving the firmness of the connection of the pole piece 120.

[0068] like Figure 4 and Figure 8 As shown, the mounting through hole 111 is a stepped hole, and the large diameter end of the mounting through hole 111 is arranged toward the outside of the cover plate body 110, the inner diameter of the large diameter end of the mounting through hole 111 is matched with the outer diameter of the boss portion 1222, the inner diameter of the small diameter end of the mounting through hole 111 is smaller than the outer diameter of the boss portion 1222, and the bottom of the boss portion 1222 is fitted with the stepped surface of the mounting through hole 111. This design can limit the second pole member 122 along its axial direction, prevent the second pole member 122 from sinking into the battery under the pressure of external force and being unable to connect with external busbars and other components, and further improve the reliability of the mounting structure of the pole assembly 120.

[0069] Continue as Figure 2 and Figure 4 As shown, in this embodiment, there are two first insulating members 131, and each pole assembly 120 corresponds to one first insulating member 131. The first insulating member 131 is a cylindrical structure, which is arranged around the outer circumference of the second pole member 122, and a step hole is provided in the first insulating member 131 to fit the outer wall of the column body 1221 and the boss portion 1222 to ensure the insulation connection between the second pole member 122 and the cover body 110. Optionally, the first insulating member 131 can be a plastic member, which has good insulation performance, is easy to obtain, and can reduce processing costs.

[0070] The number of the second insulating member 132 is one, and it is constructed as a plate member that matches the shape and size of the cover body 110. The second insulating member 132 is provided with through holes 1321 that correspond to the mounting through holes 111 one by one. The protrusions 1212 of each first pole member 121 can pass through the corresponding through holes 1321 and the mounting through holes 111 in sequence and be connected to the second pole member 122. In this embodiment, the second insulating member 132 can be a plastic member, which has good insulation performance, is easy to obtain, and can reduce processing costs.

[0071] Optionally, a plug-in portion 1322 is provided on one side of the second insulating member 132 facing the outside of the cover body 110, and the number of the plug-in portions 1322 is two. An annular plug-in portion 1322 is provided around the outer periphery of each through hole 1321, and the plug-in portion 1322 can be plugged into the corresponding mounting through hole 111. This design can limit the position of the second insulating member 132 along the radial direction of the mounting through hole 111, and prevent it from moving relative to the cover body 110 along the radial direction of the mounting through hole 111, thereby ensuring the stability of the connection between the second insulating member 132 and the cover body 110.

[0072] In order to achieve reliable installation of the seal 140, in this embodiment, the seal 140 includes a first sealing portion 141 and a second sealing portion 142, the first sealing portion 141 is sandwiched between the large diameter end of the mounting through hole 111 and the boss portion 1222 of the second pole member 122; the second sealing portion 142 is sandwiched between the boss portion 1222 and the step surface of the mounting through hole 111, and is connected to the first sealing portion 141. The first sealing portion 141 and the second sealing portion 142 cooperate to achieve a sealed connection between the pole assembly 120 and the cover body 110 to prevent battery leakage. Optionally, the first sealing portion 141 and the second sealing portion 142 can be a split structure, and are connected by welding, bonding, etc.; the first sealing portion 141 and the second sealing portion 142 can also be an integrated structure to simplify the assembly process and improve assembly efficiency. Optionally, the first sealing portion 141 and the second sealing portion 142 can both be made of rubber material.

[0073] Continue as Figure 1 and Figure 2 As shown, the cover body 110 is also provided with an injection hole 114, which is used to inject electrolyte into the battery housing 200 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 114 is arranged perpendicular to the cover body 110. The injection hole 114 includes a first injection through hole 1141 and a second injection through hole 1142 that are connected. The first injection through hole 1141 and the second injection through hole 1142 are coaxially arranged, and the first injection through hole 1141 is arranged close to the outer side of the cover body 110, and the second injection through hole 1142 is arranged close to the inner side of the cover body 110. The aperture of the first injection through hole 1141 is larger than the aperture of the second injection through hole 1142, so that the shape of the injection hole 114 is similar to a countersunk hole. After the liquid injection is completed, a sealing rubber plug can be inserted into the first liquid injection through hole 1141, and a metal sheet can be installed in the second liquid injection through hole 1142 and welded to ensure the sealing performance of the battery.

[0074] Optionally, the cover assembly 100 further includes an explosion-proof component 160, which is mounted on the cover body 110. When the air pressure inside the battery reaches a preset value, the explosion-proof component 160 ruptures to release pressure from the battery in a directional manner, thereby preventing the battery from exploding due to excessive air pressure inside the housing 200, thereby improving the safety of the battery. Figure 2 As shown, the cover body 110 is provided with an explosion-proof hole 115, and the explosion-proof assembly 160 includes an explosion-proof plate 161. The explosion-proof plate 161 is installed at the explosion-proof hole 115 and blocks the explosion-proof hole 115, thereby ensuring the sealing of the battery. Optionally, the explosion-proof plate 161 is connected to the cover body 110 by welding. A weak area is provided on the explosion-proof plate 161. 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 161 from falling off the cover body 110, thereby improving the safety of the battery. In some embodiments, the weak area is a notch. In this example, 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 and other processes. In this embodiment, the shape of the weak area can be flexibly set as needed. As Figure 2 As shown, the explosion-proof component 160 also includes a protective film 162, which is installed at the explosion-proof hole 115 and is located on the outside of the explosion-proof plate 161. The protective film 162 helps to protect the explosion-proof plate 161, not only to prevent the explosion-proof plate 161 from rupturing and failing due to the external pressure of the battery, but also to prevent external foreign matter from being deposited in the weak area of ​​the explosion-proof plate 161, causing the explosion-proof plate 161 to fail.

[0075] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate body (110) having a mounting through hole (111) disposed thereon; A pole assembly (120) mounted in the mounting through hole (111); An insulating component (130) comprising a first insulating component (131) and a second insulating component (132), wherein the first insulating component (131) is arranged on the outside of the cover body (110) and is arranged around the pole assembly (120), and the second insulating component (132) is arranged on the inside of the cover body (110); A sealing member (140) partially disposed between an inner wall of the mounting through hole (111) and the pole assembly (120); The fixing assembly (150) comprises a main body (153) and a first fixing part (151) and a second fixing part (152) respectively connected to two ends of the main body (153); the first fixing part (151) is snap-connected to the cover body (110); the second fixing part (152) is connected to the first insulating member (131); and the first fixing part (151) and the second fixing part (152) extend in opposite directions.

2. The cover assembly according to claim 1, characterized in that: A projection of the second fixing portion (152) on the cover body (110) and a projection of the pole assembly (120) on the cover body (110) have an overlapping area.

3. The cover assembly according to claim 1, characterized in that: The cover plate body (110) is provided with a snap-fitting groove (112), and the first fixing portion (151) is snap-fitted into the snap-fitting groove (112).

4. The cover assembly according to claim 3, characterized in that: The main body (153) is an annular structure, the first fixing portion (151) is an annular flange structure provided on the main body (153) and extending in a radial direction of the mounting through hole (111) in a direction away from the pole assembly (120), and the clamping groove (112) is an annular groove provided around the mounting through hole (111); or The main body (153) is an annular structure, the first fixing portion (151) comprises a plurality of snap-fit ​​protrusions arranged at intervals along the circumference of the main body (153), and each of the snap-fit ​​protrusions extends in a radial direction of the mounting through hole (111) in a direction away from the pole assembly (120), and the snap-fit ​​groove (112) comprises a plurality of sub-slots corresponding one-to-one to the snap-fit ​​protrusions.

5. The cover assembly according to claim 3, characterized in that: A limiting portion (113) is provided on the groove wall of the clamping groove (112) on a side away from the mounting through hole (111) in the radial direction of the mounting through hole (111), and the limiting portion (113) can be pressed against the surface of the first fixing portion (151) facing the outside of the cover plate body (110).

6. The cover assembly according to claim 5, characterized in that: The surface of the limiting portion (113) facing the bottom of the clamping groove (112) is a first mating surface (1131), the first mating surface (1131) is a plane or an arc surface, and the first fixing portion (151) is provided with a second mating surface (1511) that fits with the first mating surface (1131).

7. The cover assembly according to any one of claims 1 to 6, characterized in that: The pole assembly (120) comprises: A first pole piece (121), comprising a main body plate (1211) and a protruding portion (1212), wherein the main body plate (1211) is arranged on the inner side of the cover plate body (110), and the protruding portion (1212) is inserted into the mounting through hole (111); The second pole piece (122) is connected to the protruding portion (1212) and extends to the outside of the cover plate body (110).

8. The cover assembly according to claim 7, characterized in that: The sealing member (140) comprises: A first sealing portion (141) is sandwiched between the peripheral side of the second pole piece (122) and the inner wall of the mounting through hole (111); The second sealing portion (142) is connected to the first sealing portion (141) and is sandwiched between the bottom of the second pole piece (122) and the inner wall of the mounting through hole (111).

9. The cover assembly according to any one of claims 1 to 6, characterized in that: The pole assembly (120) is an integrated structure, comprising a pole body and a protrusion arranged around the outer circumference of the pole body, the pole body passes through the mounting through hole (111), and the protrusion is located between the cover plate body (110) and the second fixing portion (152).

10. A battery, characterized in that: It comprises a shell (200), a battery cell and the cover plate assembly according to any one of claims 1 to 9, wherein one side of the shell (200) has an opening, the battery cell is arranged in the shell (200), the cover plate assembly blocks the opening, and the pole ear of the battery cell is electrically connected to the pole assembly (120) of the cover plate assembly.

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