Top cover assembly, battery monomer, battery and electric device

Abstract

The utility model relates to a top cover assembly. The top cover assembly comprises a top cover sheet, a pole and a sealing ring, the sealing ring forms a first sealing structure between the top cover piece and the pole, the injection molding piece forms a second sealing structure between the top cover piece and the pole, and the overall sealing performance can be improved through double sealing. Moreover, the sealing ring can also prevent the electrolyte from being in contact with the injection-molded part to corrode the injection-molded part, so that the long-term sealing reliability of the injection-molded part is improved. Furthermore, the arrangement of the boss can increase the sealing path of the second sealing structure, and can increase the contact area between the injection molding part and the top cover plate, so that the connection force between the pole and the top cover plate is increased, and the sealing property and the connection strength between the top cover plate and the pole can be further improved. Therefore, the top cover assembly is not prone to poor sealing in the application process, and the sealing performance of the top cover assembly is remarkably improved. In addition, the utility model also provides a battery monomer, a battery and an electric device.

Description

Technical Field

[0001] This utility model relates to the field of new energy technology, and in particular to a top cover assembly, a battery cell, a battery, and an electrical device. Background Technology

[0002] The terminals of the top cover assembly are typically sealed to the aluminum sheet via a sealing ring. After the terminals are riveted or welded into position, the sealing ring is compressed to fill the gap between the terminal and the aluminum sheet. However, gases generated during battery operation may cause the aluminum sheet to deform, resulting in a decrease in the compression of the sealing ring and consequently, a poor seal. Utility Model Content

[0003] Therefore, it is necessary to provide a top cover assembly with better sealing performance to address the above problems.

[0004] A top cover assembly includes a top cover sheet, a pole, and a sealing ring. The top cover sheet has a pole hole, and the sealing ring is arranged circumferentially along the pole hole. The pole is installed in the pole hole and the sealing ring is clamped between the pole and the top cover sheet. A boss is formed on the outer surface of the top cover sheet along the circumferential direction of the pole hole, and a gap extending circumferentially between the pole and the boss is formed. The top cover assembly also includes an injection molded part, which covers the boss and fills the gap. The pole and the top cover sheet are connected and fixed through the injection molded part.

[0005] In one embodiment, the boss is perpendicular to the outer surface of the top cover sheet.

[0006] In one embodiment, the distance between the inner side of the boss and the outer side of the pole post is L, the height of the boss is H, and the width of the boss is D, where 1≤H / D≤5 and L≥1.0mm.

[0007] In one embodiment, the boss is inclined relative to the outer surface of the top cover plate toward the centerline of the pole hole.

[0008] In one embodiment, the angle between the inner side of the boss and the outer surface of the top cover is greater than or equal to 45 degrees and less than 90 degrees.

[0009] In one embodiment, the top cover sheet is stamped to form a recess, and the material in the recess is squeezed to protrude from the outer surface of the top cover sheet to form the boss.

[0010] In one embodiment, the recess includes a recessed step extending along the periphery of the pole hole, the sealing ring being supported on the recessed step; and / or, the recess includes a groove disposed on the inner surface of the top cover plate.

[0011] In one embodiment, the boss has a continuous annular structure and extends circumferentially along the pole hole.

[0012] In one embodiment, the boss includes a plurality of protrusions spaced circumferentially along the pole hole, and a notch is formed between two adjacent protrusions, the injection molded part being filled in the notch.

[0013] In one embodiment, the pole post includes a head and a protrusion extending from one side of the head, the head abutting against the outer surface of the top cover plate, and the protrusion extending into the pole post hole.

[0014] In one embodiment, the head forms a limiting step, the injection molded part extends into the limiting step, and the portion of the injection molded part extending into the limiting step forms an axial blocking portion.

[0015] In one embodiment, the surfaces of the top cover, the boss, and the pole are all formed with nanopores, and the injection molded part extends into the nanopores.

[0016] In one embodiment, the sealing ring includes an annular body and a bent portion extending axially from the inner edge of the annular body, the annular body being held between the pole post and the outer surface of the top cover plate, and the bent portion extending into the pole post hole.

[0017] In one embodiment, an insulating plate is further formed on the inner surface of the top cover sheet. The insulating plate has a clearance hole formed at the position of the pole hole, and the insulating plate includes an extension extending from the edge of the clearance hole into the pole hole.

[0018] In one embodiment, the projection of the extension and the bending portion onto the inner wall of the pole hole at least partially overlaps.

[0019] In the aforementioned top cover assembly, the sealing ring forms the first sealing structure between the top cover plate and the terminal post, while the injection-molded part forms the second sealing structure between the top cover plate and the terminal post. This double sealing improves the overall sealing performance. Furthermore, the sealing ring prevents the electrolyte from contacting and corroding the injection-molded part, thereby improving the long-term sealing reliability of the injection-molded part. Further, the boss increases the sealing path of the second sealing structure and the contact area between the injection-molded part and the top cover plate, thus increasing the connection force between the terminal post and the top cover plate. Therefore, it further enhances the sealing performance and connection strength between the top cover plate and the terminal post. Consequently, the aforementioned top cover assembly is less prone to sealing failure during application, and its sealing performance is significantly improved.

[0020] In addition, this utility model also provides a battery cell, a battery, and an electrical device.

[0021] A battery cell includes a housing, a cell assembly, and a top cover assembly as described in any of the preferred embodiments above. The housing has an opening at at least one end, the cell assembly is housed within the housing, and the top cover assembly is sealed to the opening.

[0022] A battery comprising a plurality of battery cells as described in the preferred embodiments above.

[0023] An electrical device includes a battery cell as described in the preferred embodiment above or a battery as described in the preferred embodiment above. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a top view of the top cover assembly in one embodiment of the present invention;

[0026] Figure 2 for Figure 1 The top cover assembly shown is a cross-sectional view along AA;

[0027] Figure 3 for Figure 2 An enlarged schematic diagram of part B in the top cover assembly shown;

[0028] Figure 4 for Figure 1 A schematic diagram of the structure of the top cover plate in the top cover assembly shown;

[0029] Figure 5 for Figure 1 A schematic diagram of the pole structure in the top cover assembly is shown;

[0030] Figure 6 This is a cross-sectional view of the top cover assembly in another embodiment of the present invention;

[0031] Figure 7 for Figure 6 An enlarged schematic diagram of a portion C in the top cover assembly shown;

[0032] Figure 8 for Figure 6 The diagram shows the structure of the top cover plate in the top cover assembly. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0034] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0039] This utility model discloses an electrical device, a battery, and a battery cell. The electrical device includes the battery or the battery cell and is capable of providing electrical energy. The electrical device can be a vehicle, mobile phone, portable device, laptop computer, ship, spacecraft, electric toy, power tool, energy storage device, amusement equipment, elevator, and lifting equipment, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be a carousel, a drop tower, etc.

[0040] The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. For new energy vehicles, the aforementioned battery can serve as a driving power source, thereby replacing fossil fuels to provide driving power. This application does not impose any special restrictions on the aforementioned electrical device. The aforementioned battery can be a battery pack or a battery module. When the aforementioned battery is a battery pack, the battery pack specifically includes a battery management system (BMS) and multiple battery cells. Multiple battery cells can be electrically connected in series, parallel, or a combination of series and parallel connections, and communicate with the battery management system to form a battery pack. The battery management system controls and monitors the operating status of each battery cell. Alternatively, multiple battery cells can first be connected in series and / or parallel, and then connected with a module management system to form a battery module. Multiple battery modules can then be electrically connected in series, parallel, or a combination of series and parallel connections, and together with the battery management system, form a battery pack.

[0041] The aforementioned battery cell can be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, and its external outline can be cylindrical, flat, cuboid, or other shapes, but is not limited to these. Specifically, in this embodiment, the aforementioned battery cell is a lithium-ion square battery.

[0042] In addition, please see Figures 1 to 8 The present invention also provides a top cover assembly 100. The aforementioned battery cell includes a top cover assembly 100, a housing (not shown), and a cell assembly (not shown).

[0043] The casing has a hollow structure with internal space for accommodating the battery cell assembly, electrolyte, and other components. At least one end of the casing has an opening through which the battery cell assembly can be installed. Since the battery cell in this embodiment is a prismatic cell, the outer contour of the casing is cuboid, and its opening is rectangular. A top cover assembly 100 is mounted on the casing and covers its opening, thereby creating a relatively enclosed environment inside the casing to isolate the battery cell assembly from the external environment. Because the shape of the top cover assembly 100 must conform to the shape of the opening in the casing, the top cover assembly 100 is generally rectangular.

[0044] Please see Figure 1 and Figure 2 In one embodiment of the present invention, the top cover assembly 100 includes a top cover sheet 110, a pole post 120, a sealing ring 130, and an injection molded part 140.

[0045] The top cover plate 110 can be formed from a material with high mechanical strength, such as aluminum, aluminum alloy, or stainless steel. The top cover plate 110 has an outer surface and an inner surface that are oppositely disposed. The inner surface refers to the surface of the top cover plate 110 facing the interior of the housing, and the outer surface refers to the surface of the top cover plate 110 facing away from the interior of the housing. Specifically, in this embodiment, the top cover plate 110 is generally rectangular, matching the shape of the opening in the housing. The top cover plate 110 has a pole post hole 111 (see...). Figure 4 ).

[0046] The terminal post 120 is installed in the terminal post hole 111. Its end near the cell assembly can be directly soldered to the cell assembly's tab, or it can be soldered to the adapter piece soldered to the cell assembly's tab. Please refer to the following for details. Figure 5 In this embodiment, the pole post 120 includes a head 121 and a protrusion 122 extending from one side of the head 121. The head 121 abuts against the outer surface of the top cover plate 110, and the protrusion 122 extends into the pole post hole 111.

[0047] The head 121 and the protrusion 122 can be integrally formed, with the diameter of the head 121 being larger than the diameter of the protrusion 122. When installing the electrode post 120, the protrusion 122 is inserted into the electrode post hole 111, and the head 121 abuts against the outer surface of the top cover plate 110. Specifically, the sealing ring 130 can be placed between the head 121 and the top cover plate 110 to achieve indirect contact and thus insulation. The engagement of the head 121 with the outer surface of the top cover plate 110 allows for axial positioning of the electrode post 120 in the direction pointing towards the housing, while the protrusion 122 engages with the electrode post hole 111 to circumferentially position the electrode post 120, facilitating its installation. After the protrusion 122 extends into the electrode post hole 111, it also reduces the distance between the electrode post 120 and the cell assembly, and facilitates welding of the electrode post 120 to the tabs of the cell assembly. Furthermore, the protrusion 122 can mate with the inner wall of the pole hole 111, thereby pressing it against the inner wall of the pole hole 111 along with components such as the sealing ring 130 to enhance the sealing performance.

[0048] It should be noted that in other embodiments, the electrode post 120 may also adopt other structures, as long as it ensures that the electrode post 120 at least partially protrudes from the outer surface of the top cover plate 110. For example, in another embodiment, the electrode post 120 is block-shaped and presses the sealing ring 130 against the outer surface of the top cover plate 110. (See...) Figure 6 )

[0049] The top cover plate 110 has two terminals 120, namely a positive terminal and a negative terminal. Therefore, two terminal holes 111 are respectively opened at both ends of the top cover plate 110 along its length. Furthermore, the positive terminal 120 is a one-piece molded aluminum block, which contacts and welds with the positive tab or positive adapter (not shown) of the battery cell during welding. Because it is made of the same material as the positive tab and positive adapter (not shown) of the battery cell assembly, the welding effect between the positive terminal and the positive tab is improved. The negative terminal 120 includes an aluminum block and a copper block, with the copper block located on the side of the aluminum block facing inwards from the housing. During welding, the copper block contacts and welds with the negative tab or negative adapter (not shown) of the battery cell assembly. Since the negative tab and negative adapter of the battery cell assembly are generally made of copper, the welding effect between the negative terminal and the negative tab is improved.

[0050] In addition, the top cover plate 110 is generally equipped with an injection hole (not shown in the figure) and an explosion-proof valve (not shown in the figure). The injection hole allows electrolyte to be injected into the casing. The explosion-proof valve serves to relieve pressure; when the pressure inside the casing rises due to a malfunction in the battery cell assembly, high-temperature and high-pressure gas can break through the explosion-proof valve and be discharged, thereby preventing the battery cell from exploding.

[0051] The sealing ring 130 forms an insulating and first sealing structure between the pole post 120 and the top cover plate 110. The sealing ring 130 is arranged circumferentially along the pole post hole 111, and the pole post 120 clamps the sealing ring 130 between the pole post 120 and the top cover plate 110. Under the compression of the pole post 120, the sealing ring 130 undergoes elastic deformation and fills the gap between the pole post 120 and the top cover plate 110, thereby achieving a seal.

[0052] Please refer to it again. Figure 2 In this embodiment, the sealing ring 130 includes an annular body 131 and a bent portion 132 extending axially from the inner edge of the annular body 131. The annular body 131 is sandwiched between the outer surface of the pole post 120 and the top cover plate 110, and the bent portion 132 extends into the pole post hole 111.

[0053] The annular body 131 and the bent portion 132 are integrally formed. When installing the sealing ring 130, first insert the bent portion 132 into the pole post hole 111 and make the annular body 131 abut against the outer surface of the top cover plate 110, then install the pole post 120 to press the sealing ring 130 tightly. The bent portion 132 can achieve radial positioning of the sealing ring 130 during installation, thus facilitating installation.

[0054] Furthermore, after assembly, the head 121 of the pole post 120 presses the annular body 131 against the outer surface of the top cover plate 110, while the bent portion 132 is pressed against the inner wall of the pole post hole 111 by the protrusion 122. In this way, the sealing path of the sealing ring 130 between the pole post 120 and the top cover plate 110 can be extended, thereby improving the sealing effect of the first sealing structure.

[0055] Furthermore, in this embodiment, the top cover assembly 100 also includes an insulating plate 150 formed on the inner surface of the top cover sheet 110. The insulating plate 150 has a clearance hole (not shown) corresponding to the position of the terminal hole 111. The insulating plate 150 includes an extension 151 extending from the edge of the clearance hole into the terminal hole 111. The insulating plate 150 can be injection molded and serves to form insulation between the top cover sheet 110 and the battery cell assembly. Moreover, since the extension 151 extends into the terminal hole 111, it also serves to isolate the terminal 120 from the top cover sheet 110. The protrusion 122 of the terminal 120 can press the extension 151 against the inner wall of the terminal hole 111, thereby further improving the sealing and insulation performance between the terminal 120 and the top cover sheet 110.

[0056] Furthermore, in this embodiment, the projections of the extension 151 and the bending portion 132 on the inner wall of the pole hole 111 at least partially overlap. That is, the insulating plate 150 and the sealing ring 130 overlap radially in the pole hole 111, thereby increasing the creepage distance between the pole 120 and the top cover plate 110, effectively preventing the top cover plate 110 from becoming energized under high voltage, and improving safety under high voltage.

[0057] Please refer to section 2 again. Figure 3 and Figure 4 A boss 112 is formed on the outer surface of the top cover plate 110 along the circumferential direction of the pole hole 111, and a gap (not shown in the figure) extending along the circumferential direction of the pole 120 is formed between the pole 120 and the boss 112. The injection molded part 140 covers the boss 112 and fills the gap, and the pole 120 and the top cover plate 110 are connected and fixed by the injection molded part 140.

[0058] During the molding process, the injection molded part 140 is integrally connected to the surfaces of the pole 120, the top cover 110, and the boss 111. Therefore, the pole 120 can be fixedly installed to the top cover 110 under the connecting force provided by the injection molded part 140. Thus, the installation process of the pole 120 does not involve welding, riveting, or other operations, simplifying the assembly process. The injection molded part 140 can be manufactured using nano-injection molding. Specifically, before injection molding, the surfaces of the top cover 110, the boss 112, and the pole 120 are surface-treated to form nanopores, and part of the injection molded part 140 extends into these nanopores. This increases the connecting force between the top cover 110 and the pole 120.

[0059] The injection molded part 140 forms a second sealing structure between the top cover plate 110 and the terminal post 120. Furthermore, the sealing ring 130 isolates the injection molded part 140 from the interior of the housing, preventing electrolyte from contacting and corroding the injection molded part 140, thereby improving the long-term sealing reliability of the injection molded part 140. Further, the boss 112 increases the sealing path of the second sealing structure, thus improving the sealing effect. Moreover, the boss 112 increases the contact area between the injection molded part 140 and the top cover plate 110, thereby increasing the connection force between the terminal post 120 and the top cover plate 110, and thus also improving the connection strength between the top cover plate 110 and the terminal post 120.

[0060] The top cover plate 110 has a simple structure and can be formed by stamping, thereby reducing costs. Specifically, in this embodiment, the top cover plate 110 is stamped to form a recess, and the material in the recess is squeezed to protrude from the outer surface of the top cover plate 110 to form a boss 112. That is to say, no additive or subtractive material is involved in the forming process of the top cover plate 110, so the forming is convenient and the cost is low.

[0061] Furthermore, in this embodiment, the recessed portion includes a recessed step 113 extending along the periphery of the pole hole 111, and the sealing ring 130 is supported on the recessed step 113. The recessed step 113 can position and limit the sealing ring 130, thereby facilitating the installation of the sealing ring 130.

[0062] It should be noted that in other embodiments, the recess may also include other structures such as grooves or notches. For example, while stamping to form the recessed step 113, a groove 114 is also formed on the inner surface of the top cover plate 110 (see...). Figure 6 Alternatively, the recess may consist only of a groove 114, during which the material within the groove 114 is squeezed to protrude from the outer surface of the top cover plate 110 and form a boss 112.

[0063] Please refer to it again. Figure 2 and Figure 5 In this embodiment, the portion of the pole post 120 that protrudes from the outer surface of the top cover plate 110, i.e., the head 121, forms a limiting step 1211. The injection molded part 140 extends into the limiting step 1211, and the portion of the injection molded part 140 that extends into the limiting step 1211 forms an axial blocking portion 141.

[0064] On the one hand, by forming the limiting step 1211 and the matching axial abutment 141, the sealing path of the second sealing structure can be further extended, thereby improving the sealing effect. On the other hand, the axial abutment 141, in cooperation with the limiting step 1211, can axially limit the pole post 120 in the direction away from the top cover plate 110, so as to press the pole post 120 tightly against the top cover plate 110, thereby further improving the connection strength between the pole post 120 and the top cover plate 110.

[0065] The boss 112 can be a continuous annular structure or a discontinuous structure. Specifically, in this embodiment, the boss 112 is a continuous annular structure, and the boss 112 extends circumferentially along the pole post hole 111. Thus, the contact area between the injection molded part 140 and the boss 120 is larger, resulting in a greater connection force. Furthermore, since the boss 112 completely surrounds the pole post hole 111, the sealing effect of the second sealing structure is also better.

[0066] Furthermore, the annular boss 112 can effectively isolate the electrode post hole 111 from the injection hole. Therefore, when electrolyte overflow occurs during the injection process, the boss 112 can also effectively prevent the electrolyte overflowing from the injection hole from seeping into the contact electrode post 120, thereby preventing the electrode post 120 from being corroded.

[0067] In another embodiment, the boss 112 includes a plurality of protrusions (not shown) spaced circumferentially along the pole hole 111, and a notch (not shown) is formed between two adjacent protrusions, the injection molded part 140 being filled into the notch. Thus, the injection molded part 140 will engage with the boss 112, restricting the rotation of the injection molded part 140 and thereby improving the torsional resistance of the pole 120.

[0068] Please refer to it again. Figures 2 to 4 In this embodiment, the boss 112 is perpendicular to the outer surface of the top cover plate 110. This makes it easier to form the top cover plate 110.

[0069] Furthermore, in this embodiment, the distance between the inner side of the boss 112 and the outer side of the pole post 120 is L, the height of the boss 112 is H, and the width of the boss 112 is D, where 1≤H / D≤5 and L≥1.0mm.

[0070] When H / D is less than 1, the height of the boss 112 is too low, resulting in a limited contact area with the injection molded part 140, making it difficult to provide sufficient connecting force to fix the pole post 120. When H / D is greater than 5, the height of the boss 112 is too high, making molding inconvenient, and the excessive protrusion of the boss 112 from the surface of the top cover plate 110 will affect the flatness of the top cover assembly 100. Furthermore, when L is less than 1mm, the distance between the boss 112 and the pole post 120 is too small, making it difficult for the material to enter the gap between the boss 112 and the pole post 120 during injection molding, which in turn leads to voids in the injection molded part 140 and ultimately affects the sealing performance and connection strength between the pole post 120 and the top cover plate 110.

[0071] In addition, please see Figures 6 to 8 In another embodiment, the boss 112 is inclined relative to the outer surface of the top cover plate 110 toward the centerline of the pole hole 111. After the injection molded part 140 is formed, the inclined boss 112 not only forms an adhesion with the injection molded part 140, but also prevents the injection molded part 140 from moving up and down. Therefore, the boss 112 can enhance the axial positioning of the injection molded part 140 in the pole 120, so that the injection molded part 140 can maintain pressure on the pole 120, thereby keeping the sealing ring 130 compressed, which is beneficial to further improve the sealing performance and connection strength between the top cover plate 110 and the pole 120.

[0072] Furthermore, the angle between the inner side of the boss 112 and the outer surface of the top cover plate 110 is greater than or equal to 45 degrees and less than 90 degrees. The aforementioned angle is... Figure 7 If the included angle α is less than 45 degrees, the material during injection molding will not easily enter the joint between the inner side of the boss 112 and the top cover plate 110, resulting in voids in the injection molded part 140.

[0073] In the aforementioned top cover assembly 100, the sealing ring 130 forms a first sealing structure between the top cover plate 110 and the terminal post 120, and the injection molded part 140 forms a second sealing structure between the top cover plate 110 and the terminal post 120. This double sealing improves the overall sealing performance. Furthermore, the sealing ring 130 prevents the electrolyte from contacting and corroding the injection molded part 140, thereby improving the long-term sealing reliability of the injection molded part 140. Further, the boss 112 increases the sealing path of the second sealing structure and the contact area between the injection molded part 140 and the top cover plate 110, thereby increasing the connection force between the terminal post 120 and the top cover plate 110. Therefore, it further enhances the sealing performance and connection strength between the top cover plate 110 and the terminal post 120. Thus, the aforementioned top cover assembly 100 is less prone to poor sealing during application, and its sealing performance is significantly improved.

[0074] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0075] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A top cover assembly, comprising a top cover plate, an electrode post, and a sealing ring, wherein the top cover plate has an electrode post hole, the sealing ring is disposed circumferentially along the electrode post hole, the electrode post is installed in the electrode post hole and the sealing ring is clamped between the electrode post and the top cover plate, characterized in that, The outer surface of the top cover sheet has a boss formed along the circumference of the pole hole, and a gap extending along the circumference of the pole is formed between the pole and the boss; the top cover assembly also includes an injection molded part, which covers the boss and fills the gap, and the pole and the top cover sheet are connected and fixed through the injection molded part.

2. The top cover assembly according to claim 1, characterized in that, The boss is perpendicular to the outer surface of the top cover plate.

3. The top cover assembly according to claim 2, characterized in that, The distance between the inner side of the boss and the outer side of the pole post is L, the height of the boss is H, and the width of the boss is D, where 1≤H / D≤5 and L≥1.0mm.

4. The top cover assembly according to claim 1, characterized in that, The boss is inclined relative to the outer surface of the top cover plate toward the center line of the pole hole.

5. The top cover assembly according to claim 4, characterized in that, The angle between the inner side of the boss and the outer surface of the top cover plate is greater than or equal to 45 degrees and less than 90 degrees.

6. The top cover assembly according to claim 1, characterized in that, The top cover sheet is stamped to form a recess, and the material in the recess is squeezed to protrude from the outer surface of the top cover sheet to form the boss.

7. The top cover assembly according to claim 6, characterized in that, The recess includes a recessed step extending along the periphery of the pole hole, and the sealing ring is supported on the recessed step; and / or, the recess includes a groove disposed on the inner surface of the top cover plate.

8. The top cover assembly according to claim 1, characterized in that, The boss has a continuous annular structure and extends circumferentially along the pole hole.

9. The top cover assembly according to claim 1, characterized in that, The boss includes a plurality of protrusions spaced circumferentially along the pole hole, and a notch is formed between two adjacent protrusions, and the injection molded part is filled in the notch.

10. The top cover assembly according to claim 1, characterized in that, The pole post includes a head and a protrusion extending from one side of the head. The head abuts against the outer surface of the top cover plate, and the protrusion extends into the pole post hole.

11. The top cover assembly according to claim 10, characterized in that, The head forms a limiting step, the injection molded part extends into the limiting step, and the portion of the injection molded part extending into the limiting step forms an axial blocking part.

12. The top cover assembly according to any one of claims 1 to 11, characterized in that, The surfaces of the top cover, the boss, and the pole are all formed with nanopores, and the injection molded part extends into the nanopores.

13. The top cover assembly according to any one of claims 1 to 11, characterized in that, The sealing ring includes an annular body and a bent portion extending axially from the inner edge of the annular body. The annular body is sandwiched between the outer surface of the pole post and the top cover plate, and the bent portion extends into the pole post hole.

14. The top cover assembly according to claim 13, characterized in that, It also includes an insulating plate formed on the inner surface of the top cover sheet, wherein the insulating plate has a clearance hole formed at the position of the pole hole, and the insulating plate includes an extension extending from the edge of the clearance hole into the pole hole.

15. The top cover assembly according to claim 14, characterized in that, The projections of the extension and the bend on the inner wall of the pole hole at least partially overlap.

16. A single battery cell, characterized in that, The device includes a housing, a battery cell assembly, and a top cover assembly as described in any one of claims 1 to 15, wherein the housing has an opening at at least one end, the battery cell assembly is housed within the housing, and the top cover assembly is sealed to the opening.

17. A battery, characterized in that, It includes multiple battery cells as described in claim 16 above.

18. An electrical appliance, characterized in that, Includes the battery cell as described in claim 16 or the battery as described in claim 17.

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