Top cover assembly and battery

Abstract

The utility model belongs to battery technical field discloses a top cover subassembly and battery. The top cover subassembly includes cover plate, pole terminal, lower insulating piece, upper insulating piece and pole pressing plate, the upper and lower sides of cover plate are connected upper insulating piece and lower insulating piece respectively, the pole pressing plate sets up at the top of upper insulating piece, the top cover subassembly has the pole mounting hole who sets up in turn and penetrates lower insulating piece, cover plate and upper insulating piece, the pole terminal includes base and conductive stud, and the conductive stud is set up in pole mounting hole and is connected with pole pressing plate screw, and the base is attached to the bottom of lower insulating piece, so that lower insulating piece is extruded and compacts under the action of torsion. Through above-mentioned setting, make the mode of pole terminal fixed on the cover plate is replaced by riveting welding for screw connection, can also adjust the compression of lower insulating piece simultaneously, reach the sealing effect of accurate controllable, thereby effectively reduce the installation difficulty, save the welding cost, and further improve the product quality and yield of top cover subassembly.

Description

Technical Field

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

[0002] As electronic products become increasingly smaller, lighter, and more portable, the power sources for these products are also developing towards higher capacity, higher safety, and greater portability. Lithium batteries, with their high capacity and other excellent characteristics, are widely used in electronic products.

[0003] Lithium-ion batteries consist of components such as a cover plate, terminals, and explosion-proof devices, with the terminals and explosion-proof devices both formed on the cover plate. Currently, conventional crimped lithium-ion batteries require the cover plate to be crimped with a pressure ring, and then the pressure ring is welded to the terminals using laser welding. However, this fixing method is prone to safety issues such as weld holes and weld slag, leading to seal failure after prolonged use, which in turn causes battery leakage or even the risk of battery bulging and fire. Moreover, the weld appearance is difficult to guarantee, requiring secondary grinding or re-welding, which increases costs and may lead to secondary seal failure, thus seriously affecting battery production yield and posing significant safety hazards.

[0004] Therefore, it is necessary to design a top cover assembly and battery to solve the problems existing in the prior art. Utility Model Content

[0005] The purpose of this utility model is to provide a top cover assembly and battery that can improve the sealing safety and reliability of the product, extend its service life, and at the same time reduce the difficulty of production operations and save costs.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The top cover assembly includes: a cover plate, a terminal block, a lower insulating component, an upper insulating component, and a terminal block pressure plate. The upper and lower sides of the cover plate are respectively connected to the upper insulating component and the lower insulating component. The terminal block pressure plate is disposed on the top of the upper insulating component. The top cover assembly also has a terminal block mounting hole that runs from bottom to top through the lower insulating component, the cover plate, and the upper insulating component. The terminal block includes a connected base and a conductive stud. The conductive stud runs from bottom to top through the terminal block mounting hole and is threadedly connected to the terminal block pressure plate. The base fits against the bottom of the lower insulating component so that the lower insulating component is squeezed and compacted by torsional force.

[0008] Preferably, the top of the pole plate has a protruding part, and the outer periphery of the protruding part has knurling.

[0009] Preferably, a self-locking assembly is provided between the pole plate and the upper insulating member. The self-locking assembly includes a ratchet and a locking hole. The ratchet is provided in one of the bottom of the pole plate and the top of the upper insulating member, and the locking hole is provided in the other of the bottom of the pole plate and the top of the upper insulating member. The ratchet and the locking hole have a unidirectional anti-return profile that matches each other, so that when the ratchet is inserted into the locking hole, the ratchet locks in the locking hole in the reverse direction of rotation.

[0010] Preferably, at least two ratchet teeth and at least two locking holes are provided around the axial direction of the pole mounting hole.

[0011] Preferably, the shape of the unidirectional check profile includes any one of the following: sawtooth shape, right triangle, asymmetrical trapezoid, and circular arc tooth shape.

[0012] Preferably, the lower insulating component includes an insulating body and an annular sealing ring. The insulating body is sandwiched between the bottom of the cover plate and the base. The annular sealing ring includes a horizontal portion and a vertical portion. The horizontal portion is sandwiched between the bottom of the cover plate and the base. The vertical portion passes through the portion of the pole mounting hole located on the cover plate and is sandwiched between the conductive stud and the cover plate.

[0013] Preferably, the conductive stud includes a base and a columnar threaded portion. The horizontal cross-sectional area of ​​the base is larger than the horizontal cross-sectional area of ​​the columnar threaded portion. The base is frustum-shaped and protrudes from the top of the base. The base passes through the lower insulating member, the cover plate, and the upper insulating member. The vertical portion is sandwiched between the cover plate and the base. The columnar threaded portion is threadedly connected to the pole plate pressure plate.

[0014] Preferably, the top cover assembly further includes a connecting piece with a plug-in hole; the bottom of the base has a protruding plug-in boss that is inserted into the plug-in hole.

[0015] Preferably, a positioning component is further provided between the upper insulating member and the cover plate. The positioning component includes a positioning post and a positioning groove. The positioning post is inserted into the positioning groove for limiting. The positioning post is provided in one of the bottom of the upper insulating member and the top of the cover plate, and the positioning groove is provided in the other of the bottom of the upper insulating member and the top of the cover plate.

[0016] The battery includes a casing, a cell, and the aforementioned top cover assembly. The casing has an opening at one end, and the cell is housed within the casing through the opening. The top cover assembly seals over the opening, and the terminal posts formed on the top cover assembly are electrically connected to the cell.

[0017] The beneficial effects of this utility model are:

[0018] This utility model provides a top cover assembly in which the method of fixing the pole terminals to the cover plate can be changed from traditional riveting and welding to threaded connection. By tightening the pole pressure plate, the pole terminals are locked and fixed to the cover plate. At the same time, by cooperating with the conductive studs to lock and adjust the compression of the lower insulation component, a precise and controllable sealing effect is achieved. This effectively reduces the installation difficulty, saves welding costs, and avoids the risks of low sealing safety and short service life caused by problems such as weld holes, weld slag, and inconsistent weld seams. In this way, the product quality and yield of the top cover assembly are improved.

[0019] This utility model also provides a battery that, due to the aforementioned top cover assembly, has high production efficiency, low cost, improved product yield, higher safety and reliability, and a longer service life. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the top cover assembly provided by this utility model;

[0021] Figure 2 This is an exploded view of the top cover assembly provided by this utility model;

[0022] Figure 3 This is a top view of the top cover assembly provided by this utility model;

[0023] Figure 4 It is along Figure 3 Sectional view at point AA;

[0024] Figure 5 yes Figure 4 A magnified view of a section at point B in the middle;

[0025] Figure 6 This is a schematic diagram of the upper insulating member provided by this utility model from a first-view perspective;

[0026] Figure 7 This is a structural schematic diagram of the upper insulating member provided by this utility model from a second perspective;

[0027] Figure 8 This is a schematic diagram of the pole plate provided by this utility model from a first-view perspective;

[0028] Figure 9 This is a partial enlarged view of the pole plate provided by this utility model;

[0029] Figure 10 This is a schematic diagram of the pole plate provided by this utility model from a second perspective;

[0030] Figure 11 It is along Figure 3 Sectional view at CC;

[0031] Figure 12 yes Figure 11 A magnified view of a section at point D.

[0032] In the picture:

[0033] 1. Cover plate; 11. Pressure relief hole; 12. Fluid injection hole;

[0034] 2. Terminal post; 21. Positive terminal post; 22. Negative terminal post; 201. Base; 202. Conductive stud; 2021. Base; 2022. Threaded cylindrical part; 203. Insertion boss;

[0035] 3. Lower insulating component; 31. Insulating body; 311. Clearance hole; 32. Annular sealing ring; 321. Horizontal part; 322. Vertical part;

[0036] 4. Upper insulating component; 41. Annular flange;

[0037] 5. Pole post pressure plate; 51. Protrusion; 511. Knurling;

[0038] 6. Positioning component; 61. Positioning post; 62. Positioning groove;

[0039] 7. Self-locking component; 71. Ratchet; 72. Lock hole;

[0040] 8. Connecting piece; 81. Insertion hole;

[0041] 9. Explosion-proof valve assembly. Detailed Implementation

[0042] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0043] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0046] The technical solution provided by this utility model will be described below with reference to the accompanying drawings and specific embodiments.

[0047] Combination Figures 1 to 12 As shown, this utility model provides a top cover assembly, which includes a cover plate 1, a terminal post, a lower insulating member 3, an upper insulating member 4, and a terminal post pressure plate 5. The upper insulating member 4 and the lower insulating member 3 are respectively connected to the upper and lower sides of the cover plate 1. The terminal post pressure plate 5 is disposed on the top of the upper insulating member 4. Furthermore, the top cover assembly has terminal post mounting holes that pass through the lower insulating member 3, the cover plate 1, and the upper insulating member 4 sequentially from bottom to top. The terminal post includes a base 201 and a conductive stud 202 connected to each other. The conductive stud 202 passes through the terminal post mounting hole from bottom to top and is threadedly connected to the terminal post pressure plate 5. The base 201 fits against the bottom of the lower insulating member 3, so that the lower insulating member 3 is compressed and compacted under torsional force.

[0048] Through the above settings, the method of fixing the pole terminal to the cover plate 1 can be changed from the traditional riveting and welding to a threaded connection. By tightening the pole pressure plate 5, the pole terminal is locked and fixed to the cover plate 1. At the same time, the pole pressure plate 5 cooperates with the conductive stud 202 to lock and adjust the compression of the lower insulating part 3, thereby achieving a precise and controllable sealing effect. This effectively reduces the installation difficulty, saves welding costs, and avoids the risk of low sealing safety and short service life caused by problems such as weld holes, weld slag and inconsistent weld seams. In this way, the product quality and yield of the top cover assembly are improved.

[0049] For example, refer to Figure 2As shown, the top cover assembly provided by this utility model is used in a prismatic battery. The terminal blocks mainly include a positive terminal block 21 and a negative terminal block 22. In this embodiment, the positive terminal block 21 and the negative terminal block 22 are located on the same side of the prismatic battery and are assembled at both ends of the cover plate 1 along the length direction of the cover plate 1. Correspondingly, both ends of the cover plate 1 are provided with a lower insulating member 3, an upper insulating member 4, and a terminal block pressure plate 5, and each end is provided with a terminal block mounting hole that penetrates the lower insulating member 3, the cover plate 1, and the upper insulating member 4, so as to insulate the positive terminal block 21 and the negative terminal block 22 to the cover plate 1 respectively, ensuring that the battery equipped with this top cover assembly has normal charging and discharging functions.

[0050] Preferably, in this embodiment, the positive electrode post 21 is a copper-aluminum friction-welded electrode post, wherein the conductive stud 202 is made of copper; the negative electrode post 22 and the electrode post plate 5 are made of copper, and all copper materials can be nickel-plated or tin-plated to enhance their resistance to oxidation and corrosion or their strength.

[0051] The following section uses the upper insulating component 4, lower insulating component 3, and terminal pressure plate 5 located near the negative terminal post 22 as examples to further illustrate the top cover assembly:

[0052] Combination Figures 3 to 5 As shown, a positioning component 6 is also provided between the upper insulating member 4 and the cover plate 1. The positioning component 6 includes positioning posts 61 and positioning grooves 62. In this embodiment, the bottom of the upper insulating member 4 is provided with a plurality of positioning posts 61 protruding outwards, and the bottom of the cover plate 1 is provided with a plurality of positioning grooves 62 recessed outwards. The positioning posts 61 and the positioning grooves 62 correspond one-to-one, so that when the positioning posts 61 are inserted into the positioning grooves 62, the upper insulating member 4 and the cover plate 1 can be fixed in place, preventing the upper insulating member 4 from sliding and ensuring that the part of the pole mounting hole located on the upper insulating member 4 and the cover plate 1 can be aligned in the center, avoiding offset.

[0053] Of course, in other parallel embodiments, a positioning groove 62 can be provided at the bottom of the upper insulating member 4 and a positioning post 61 can be provided at the top of the cover plate 1. This can also achieve the purpose of fixing the upper insulating member 4 and the cover plate 1 relative to each other in the radial direction of the pole mounting hole. Therefore, the present invention does not limit the position of the positioning post 61 and the positioning groove 62.

[0054] Preferably, two positioning posts 61 are provided and are symmetrically arranged at the bottom of the upper insulating member 4 with the axis of the pole mounting hole as the center. Two positioning grooves 62 are provided and are symmetrically arranged at the top of the cover plate 1 with the axis of the pole mounting hole as the center, so as to further enhance the limiting effect.

[0055] Furthermore, in this embodiment, reference is made to... Figure 6As shown, an annular flange 41 protrudes from the edge of the portion of the electrode mounting hole located on the upper insulating member 4. The annular flange 41 can be inserted between the inner wall of the portion of the electrode mounting hole located on the cover plate 1 and the conductive stud 202 to insulate the conductive stud 202 from the cover plate 1.

[0056] Optionally, refer to Figure 5 As shown, a self-locking assembly 7 is also provided between the pole plate 5 and the upper insulating member 4. The self-locking assembly 7 includes a ratchet 71 and a locking hole 72. In this embodiment, reference is made to... Figure 7 , Figure 8 As shown, the bottom of the pole plate 5 has several protruding ratchet teeth 71, and the top of the upper insulating member 4 has several recessed locking holes 72. Each ratchet tooth 71 corresponds to one locking hole 72, and the ratchet tooth 71 and locking hole 72 have a unidirectional check-back profile that engages with each other. This ensures that when a ratchet tooth 71 is inserted into a corresponding locking hole 72, it locks itself in the locking hole 72 in the reverse direction of rotation. This design ensures a tight connection between the pole plate 5 and the upper insulating member 4 after contact. Furthermore, the pole plate 5 can only be tightened in one direction and cannot be loosened. When other threaded components are connected to the conductive stud 202, this effectively prevents the pole plate 5 from loosening, ensuring the locking and sealing effect of the top cover assembly.

[0057] The shape of the one-way check valve profile includes any one of the following: sawtooth, right-angled triangle, asymmetrical trapezoid, and circular arc tooth. It can be understood that the one-way check valve profile of the ratchet 71 complements the one-way check valve profile of its corresponding locking hole 72, allowing the pole plate 5 and the upper insulating member 4 to slide relative to each other in the clockwise direction, while interfering with each other to prevent rotation in the counter-clockwise direction. For example, refer to... Figure 9 As shown, in this embodiment, taking the ratchet 71 as an example, the shape of the one-way check contour is a right triangle, the slope angle of the forward twisting surface m can be 30-45°, the angle of the reverse twisting surface n is 90°, and the reverse twisting surface is perpendicular to achieve the locking between the ratchet 71 and the locking hole 72, thereby taking into account both the sliding feel and the anti-reverse torque effect.

[0058] To enhance the anti-reverse and anti-reverse effect, in this embodiment, at least two ratchet teeth 71 and two locking holes 72 are provided along the axial direction of the pole mounting hole. By increasing the number of ratchet teeth 71 and locking holes 72, the distance between any ratchet tooth 71 and two adjacent locking holes 72 along the circumferential direction can be shortened, so that at any rotation angle, at least one pair of ratchet teeth 71 and locking holes 72 are in a meshing state. Moreover, the rotation angle of the pole pressure plate 5 can be further reduced, thereby significantly reducing the risk of the pole pressure plate 5 loosening.

[0059] Optionally, in this embodiment, reference is made to... Figure 10As shown, the top of the pole plate 5 is also provided with a protrusion 51, and the outer periphery of the protrusion 51 has knurling 511. The cross-sectional shape of the knurling 511 can be a regular hexagon, a regular octagon or other regular polygonal shape, so that the staff can tighten the pole plate 5 with tools such as wrenches.

[0060] Optionally, in this embodiment, reference is made to Figure 5 As shown, the lower insulating component 3 includes an insulating body 31 and an annular sealing ring 32. The insulating body 31 is sandwiched between the bottom of the cover plate 1 and the base 201 to achieve insulation between the cover plate 1 and the base 201. The annular sealing ring 32 includes a horizontal part 321 and a vertical part 322. The horizontal part 321 is sandwiched between the bottom of the cover plate 1 and the base 201. The vertical part 322 passes through the part of the electrode mounting hole located in the cover plate 1 and is sandwiched between the conductive stud 202 and the cover plate 1. When the electrode pressure plate 5 is tightened, the base 201 and the cover plate 1 can squeeze and deform the middle horizontal part 321, so that the horizontal part 321 is squeezed and compacted and the gap between the horizontal part 321 and the base 201 and the cover plate 1 is eliminated, thereby achieving a seal between the cover plate 1 and the negative electrode 22 and avoiding the risk of electrolyte leakage.

[0061] More specifically, see reference Figure 11 As shown, one end of the insulating body 31 extends between the cover plate 1 and the base 201 of the negative terminal 22, and the other end extends between the cover plate 1 and the base 201 of the positive terminal 21, so that the insulating body 31 is entirely attached to the bottom of the cover plate 1. This arrangement achieves insulation between the positive terminal 21, the negative terminal 22, and the cover plate 1, and also isolates the cover plate 1 from the battery cells, ensuring that no area of ​​the cover plate 1 is charged, effectively improving the safety of the top cover assembly during use.

[0062] Optionally, in this embodiment, reference is made to Figure 12As shown, the conductive stud 202 includes a base 2021 and a columnar threaded portion 2022. The horizontal cross-sectional area of ​​the base 2021 is larger than that of the columnar threaded portion 2022. The base 2021 is frustoconical and protrudes from the top of the base 201, allowing it to be positioned and penetrate the lower insulating member 3, the cover plate 1, and the upper insulating member 4. Simultaneously, the vertical portion 322 is sandwiched between the cover plate 1 and the base 2021, ensuring a reliable seal between the cover plate 1 and the negative electrode post 22. The columnar threaded portion 2022 can pass upwards through the electrode post mounting hole and is threadedly connected to the electrode post pressure plate 5. In this configuration, because the horizontal cross-sectional area of ​​the base 2021 is larger than that of the columnar threaded portion 2022, the structural connection strength between the conductive stud 202 and the base 201 is improved, enhancing the conductive stud 202's resistance to torsional deformation. This allows the electrode post pressure plate 5 to apply greater torque to tighten the negative electrode post 22 onto the cover plate 1. Furthermore, since the outer peripheral surface of the base 2021 is not threaded, the wear on the annular seal 32 can be reduced after the outer peripheral surface of the base 2021 is in contact with the vertical part 322 of the annular seal 32, thereby effectively extending the service life of the annular seal 32.

[0063] It should be noted that the length of the cylindrical threaded part 2022 that exceeds the pole plate 5 can be trimmed by cutting or shortening. After removing the part of the cylindrical threaded part 2022 that exceeds the pole plate 5, the cylindrical threaded part 2022 can be flush with the upper surface of the pole plate 5 to ensure the consistency of the assembly effect.

[0064] Furthermore, in this embodiment, the bottom of the base 201 is provided with a protruding insertion boss 203. The top cover assembly also includes a connecting piece 8, which has an insertion hole 81. The insertion hole 81 is coaxially arranged with the pole mounting hole. After the negative pole 22 is securely mounted on the cover plate 1, the connecting piece 8 and the negative pole 22 are inserted and connected by aligning the insertion hole 81 with the insertion boss 203, thereby realizing the positioning connection between the connecting piece 8 and the negative pole 22, which facilitates the subsequent welding of the connecting piece 8 and the negative pole 22.

[0065] Optionally, refer to Figure 2 As shown, the top cover assembly provided by this utility model also includes an explosion-proof valve assembly 9, which is located in the middle of the cover plate 1. The cover plate 1 has a pressure relief hole 11 for mounting the explosion-proof valve assembly 9, and the explosion-proof valve assembly 9 is sealed on the pressure relief hole 11. When the battery experiences thermal runaway, the high-temperature and high-pressure gas generated inside the battery can rupture the explosion-proof valve assembly, allowing the battery interior to connect with the outside through the pressure relief hole 11. This allows the high-temperature and high-pressure gas to be discharged outward through the pressure relief hole 11, thereby reducing the temperature and pressure inside the battery and preventing the battery from exploding.

[0066] Optionally, the cover plate 1 is also provided with an injection hole 12, and the insulating body 31 is provided with a clearance hole 311 coaxially arranged with the injection hole 12, so that the electrolyte can be injected into the battery through the injection hole 12 and the clearance hole 311 in sequence.

[0067] This utility model also provides a battery, including a casing, a battery cell, and the aforementioned top cover assembly. The casing has an opening at one end, through which the battery cell is housed. The top cover assembly seals over the opening, and the terminal blocks formed on the top cover assembly are electrically connected to the battery cell. Specifically, a positive electrode tab and a negative electrode tab are respectively led out from the same side of the battery cell. The positive electrode tab is welded to a connecting piece 8 connected to the positive terminal block 21, and the negative electrode tab is welded to a connecting piece 8 connected to the negative terminal block 22, thereby forming a current transmission path between the battery cell and the terminal blocks, achieving a conductive connection between the battery cell and the terminal blocks.

[0068] The battery provided by this utility model, due to the aforementioned top cover assembly, has high production efficiency, low cost, improved product yield, higher safety and reliability, and a longer service life.

[0069] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0070] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A top cover assembly, characterized in that, include: The top cover assembly comprises a cover plate (1), a pole terminal, a lower insulating component (3), an upper insulating component (4), and a pole pressure plate (5). The upper and lower sides of the cover plate (1) are respectively connected to the upper insulating component (4) and the lower insulating component (3). The pole pressure plate (5) is disposed on the top of the upper insulating component (4). The top cover assembly also has pole mounting holes that pass through the lower insulating component (3), the cover plate (1), and the upper insulating component (4) from bottom to top. The pole terminal includes a base (201) and a conductive stud (202) connected to each other. The conductive stud (202) passes through the pole mounting hole from bottom to top and is threadedly connected to the pole pressure plate (5). The base (201) fits against the bottom of the lower insulating component (3) so that the lower insulating component (3) is squeezed and compacted by torque.

2. The top cover assembly according to claim 1, characterized in that, The top of the pole plate (5) is provided with a protrusion (51), and the outer periphery of the protrusion (51) is knurled (511).

3. The top cover assembly according to claim 1, characterized in that, A self-locking assembly (7) is provided between the pole plate (5) and the upper insulating member (4). The self-locking assembly (7) includes a ratchet (71) and a locking hole (72). The ratchet (71) is provided protruding from one of the bottom of the pole plate (5) and the top of the upper insulating member (4), and the locking hole (72) is provided recessed from the other of the bottom of the pole plate (5) and the top of the upper insulating member (4). The ratchet (71) and the locking hole (72) have a unidirectional anti-return profile that matches each other, so that when the ratchet (71) is inserted into the locking hole (72), the ratchet (71) is locked in the locking hole (72) in the reverse direction of rotation.

4. The top cover assembly according to claim 3, characterized in that, Around the axis of the pole mounting hole, both the ratchet (71) and the locking hole (72) are provided with at least two.

5. The top cover assembly according to claim 3, characterized in that, The shape of the unidirectional check profile includes any one of the following: sawtooth, right triangle, asymmetrical trapezoid, and circular arc tooth.

6. The top cover assembly according to claim 1, characterized in that, The lower insulating component (3) includes an insulating body (31) and an annular sealing ring (32). The insulating body (31) is sandwiched between the bottom of the cover plate (1) and the base (201). The annular sealing ring (32) includes a horizontal part (321) and a vertical part (322). The horizontal part (321) is sandwiched between the bottom of the cover plate (1) and the base (201). The vertical part (322) passes through the part of the pole mounting hole located on the cover plate (1) and is sandwiched between the conductive stud (202) and the cover plate (1).

7. The top cover assembly according to claim 6, characterized in that, The conductive stud (202) includes a base (2021) and a columnar threaded portion (2022). The horizontal cross-sectional area of ​​the base (2021) is larger than that of the columnar threaded portion (2022). The base (2021) is frustoconical and protrudes from the top of the base (201). The base (2021) passes through the lower insulating member (3), the cover plate (1), and the upper insulating member (4). The vertical portion (322) is sandwiched between the cover plate (1) and the base (2021). The columnar threaded portion (2022) is threadedly connected to the pole plate (5).

8. The top cover assembly according to claim 1, characterized in that, The top cover assembly also includes a connecting piece (8), on which a plug-in hole (81) is provided; the bottom of the base (201) is provided with a plug-in boss (203), which is limited to being plugged into the plug-in hole (81).

9. The top cover assembly according to claim 1, characterized in that, A positioning component (6) is also provided between the upper insulating member (4) and the cover plate (1). The positioning component (6) includes a positioning post (61) and a positioning groove (62). The positioning post (61) is inserted into the positioning groove (62) for limiting. The positioning post (61) is provided protruding from one of the bottom of the upper insulating member (4) and the top of the cover plate (1), and the positioning groove (62) is provided recessed from the other of the bottom of the upper insulating member (4) and the top of the cover plate (1).

10. A battery, characterized in that, The device includes a housing, a battery cell, and a top cover assembly according to any one of claims 1-9. The housing has an opening at one end, the battery cell is housed within the housing through the opening, the top cover assembly is sealed over the opening, and the terminal post formed on the top cover assembly is electrically connected to the battery cell.

Images