Battery cover plate assembly and battery

Abstract

The utility model relates to a battery cover plate assembly and a battery, and the battery cover plate assembly comprises a lower plastic part which is provided with a through hole; the pole comprises a first section, a second section and a third section which are connected, the first section and the second section penetrate through the through hole, and the third section is used for abutting against the bottom surface of the lower plastic part; the substrate is arranged above the lower plastic part and sleeves the periphery of the second section; the upper plastic part is arranged above the base plate and arranged on the periphery of the first section in a sleeving mode, the first section is exposed out of the upper plastic part, and the first section is pressed so that the first section can be fixedly connected with the upper plastic part. The third section of the pole abuts against the bottom face of the lower plastic part, the substrate is arranged on the periphery of the second section in a sleeving mode, the upper plastic part is arranged on the periphery of the first section in a sleeving mode, the first section exposed out of the upper plastic part is pressed, the first section is fixedly connected with the upper plastic part, connection stability is improved, dependence on the injection molding technology is reduced, the manufacturing technological process is simplified, and production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery manufacturing, in particular to a battery cover plate assembly and a battery. BACKGROUND

[0002] The lithium battery cover plate is one of the key components of the lithium battery, and its manufacturing quality and efficiency directly affect the performance and cost of the entire battery.

[0003] In the existing lithium battery cover plate manufacturing process, the upper plastic part is injection molded by an injection molding machine to form the final required cover plate structure. This process mainly relies on injection molding technology, especially using PPS (polyphenylene sulfide) material for heating molding.

[0004] However, the existing injection molding technology has many shortcomings. On the one hand, the injection molding equipment is expensive. On the other hand, the injection molding process is relatively complex, requiring strict temperature control and mold design, further increasing the manufacturing difficulty and cost. In addition, the production efficiency of the injection molding process is relatively low, especially when facing the demand for multi-variety small-batch production, the production cycle extension and manufacturing cost increase caused by process limitations are particularly obvious.

[0005] In summary, the existing battery cover plate manufacturing has the problems of complex process, low production efficiency, high cost, etc. INVENTION CONTENTS

[0006] Therefore, it is necessary to provide a battery cover plate assembly and a battery to solve the problems of low manufacturing efficiency of the existing battery cover plate.

[0007] A battery cover plate assembly comprises:

[0008] a lower plastic part provided with a through hole;

[0009] a pole comprising a first segment, a second segment and a third segment connected in sequence, the first segment and the second segment penetrating the through hole, and the third segment being used to abut against the bottom surface of the lower plastic part;

[0010] a base plate arranged above the lower plastic part and sleeved on the outer periphery of the second segment;

[0011] an upper plastic part arranged above the base plate and sleeved on the outer periphery of the first segment, the first segment being exposed from the upper plastic part, and the first segment being press-fitted to be fixedly connected with the upper plastic part.

[0012] In one of the embodiments, a gap exists between the outer periphery of the second segment and the through hole;

[0013] further comprising a sealing member sleeved on the outer periphery of the second segment, and the sealing member being arranged in the gap.

[0014] In one of the embodiments, the substrate is provided with a pole hole, the second section is arranged in the pole hole, an inner diameter of the pole hole is smaller than an inner diameter of the through hole, and the substrate is pressed on the sealing member.

[0015] In one of the embodiments, an outer periphery of the pole hole is provided with a mounting groove, and a surface of the upper plastic part close to the substrate is provided with a mounting structure, which is embedded in the mounting groove.

[0016] In one of the embodiments, an outer periphery of the pole hole is provided with an outward annular protrusion, and a tooth-shaped groove is arranged on a surface of the annular protrusion.

[0017] In one of the embodiments, the upper plastic part is provided with a mounting hole, the second section is arranged in the mounting hole, an outer periphery of the mounting hole is provided with a mounting structure, and the mounting structure is an annular tooth.

[0018] In one of the embodiments, a diameter of the second section is smaller than a diameter of the first section, and the diameter of the first section is smaller than a diameter of the third section.

[0019] In one of the embodiments, cross sections of the first section and the second section are circular, and a cross section of the third section is polygonal.

[0020] In one of the embodiments, a fourth section is further arranged above the first section, a diameter of the fourth section is smaller than that of the first section, and the fourth section is an outward protrusion.

[0021] In the battery cover plate assembly, the multi-section pole is arranged in the through hole of the lower plastic part, the third section of the pole abuts against a bottom surface of the lower plastic part, the substrate is arranged on an outer periphery of the second section, the upper plastic part is arranged on an outer periphery of the first section, the first section is fixedly connected with the upper plastic part by pressing the first section exposed from the upper plastic part, the connection stability of the first section and the upper plastic part is improved, the dependence on the injection molding process is reduced, the manufacturing process is simplified, the production efficiency is improved, and the production cost is reduced.

[0022] According to another purpose of the utility model, a battery is further provided, which comprises the battery cover plate assembly.

[0023] In the battery, the standardized battery cover plate assembly is adopted, the manufacturing process is effectively simplified, and the production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 FIG. 1 is a structural schematic diagram of a battery cover plate assembly.

[0025] Figure 2 FIG. 2 is a sectional schematic diagram of the battery cover plate assembly.

[0026] Figure 3 Fig. 1 is a structural schematic view of a lower plastic part.

[0027] Figure 4 Fig. 2 is a structural schematic view of a base plate.

[0028] Figure 5 Fig. 3 is a structural schematic view of a pole.

[0029] Figure 6 Fig. 4 is a structural schematic view of an upper plastic part.

[0030] Fig. 1 is a structural schematic view of a lower plastic part.

[0031] Fig. 2 is a structural schematic view of a base plate.

[0032] Fig. 3 is a structural schematic view of a pole.

[0033] Fig. 4 is a structural schematic view of an upper plastic part.

[0034] Fig. 5 is a structural schematic view of a sealing part. DETAILED DESCRIPTION

[0035] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced in a variety of ways beyond the specific embodiments described herein without departing from the spirit of the present application, and it is intended that the present application cover all modifications and variations of this application within the scope of the appended claims.

[0036] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In addition, the terms "first", "second", and the like, if any appear in the description, are used for descriptive purposes and are not to be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0038] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise explicitly specified and limited, if the first feature is described as "on" or "under" the second feature or similar, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the second feature, or only indicate that the first feature is lower than the second feature in horizontal height.

[0040] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and do not represent the only implementation.

[0041] Referring to Figures 1 to 2 , Figure 1 , Figure 2 respectively show the structural schematic diagram and the cross-sectional schematic diagram of the battery cover plate assembly in an embodiment of the present application.

[0042] Referring to Figure 1 , an embodiment of the present application provides a battery cover plate assembly, which comprises a lower plastic part 1, a base plate 3, an upper plastic part 4 and a pole 2.

[0043] Specifically, the lower plastic part 1 is provided with a through hole 11; the pole post 2 comprises a first section 21, a second section 22 and a third section 23 connected in sequence, the first section 21 and the second section 22 are arranged in the through hole 11, and the third section 23 is arranged in abutment with the bottom surface of the lower plastic part 1; the base plate 3 is arranged above the lower plastic part 1 and is sleeved on the outer periphery of the second section 22; the upper plastic part 4 is arranged above the base plate 3 and is sleeved on the outer periphery of the first section 21, the first section 21 is exposed from the upper plastic part 4, and the first section 21 is pressed to be fixedly connected with the upper plastic part 4.

[0044] In the specific implementation process, the first section 21 and the second section 22 of the pole post 2 are arranged in the through hole 11 of the lower plastic part 1, and the third section 23 is arranged in abutment with the bottom surface of the lower plastic part 1. The base plate 3 is arranged above the lower plastic part 1 and is sleeved on the outer periphery of the second section 22 of the pole post 2. The upper plastic part 4 is sleeved on the outer periphery of the first section 21 of the pole post 2, and the top of the pole post 2, i.e. the first section 21, is subjected to stamping treatment by using a stamping device, so that the part of the first section 21 exposed from the upper plastic part 4 is deformed, thereby forming a close fixed connection with the upper plastic part 4, and the connection reliability between the pole post 2 and the upper plastic part 4 is improved.

[0045] In one of the embodiments, the lower plastic part 1 is a base part of the battery cover plate assembly, and the through hole 11 is arranged inside the lower plastic part 1 for accommodating the arrangement of the pole post 2. The shape and size of the through hole 11 are matched with the first section 21 and the second section 22 of the pole post 2, so as to ensure that the pole post 2 can smoothly pass through the through hole 11 while maintaining sufficient structural strength.

[0046] In one of the embodiments, the pole post 2 serves as a conductive component in the battery cover plate assembly and comprises the first section 21, the second section 22 and the third section 23 connected in sequence. The first section 21 is located at the top of the pole post 2 and is used for connecting with the external circuit of the battery; the second section 22 is located between the first section 21 and the third section 23, is arranged in the through hole 11 of the lower plastic part 1, and serves as a support and a conductor; and the third section 23 is arranged in abutment with the bottom surface of the lower plastic part 1, so as to ensure the stable installation of the pole post 2.

[0047] In one of the embodiments, the base plate 3 is arranged above the lower plastic part 1 and is sleeved on the outer periphery of the second section 22 of the pole post 2. The main function of the base plate 3 is to provide additional structural support and serve as a transition layer between the upper plastic part 4 and the lower plastic part 1.

[0048] In one of the embodiments, the upper plastic part 4 is arranged above the base plate 3 and is sleeved on the outer periphery of the first section 21 of the pole post 2. The top of the pole post 2 is subjected to stamping, so that the pole post 2 is fixedly connected with the upper plastic part 4, thereby ensuring the overall stability and conductive performance of the battery cover plate assembly.

[0049] As described above, the pole column 2 of the multi-section structure is arranged in the through hole 11 of the lower plastic part 1, wherein the third section 23 of the pole column 2 abuts against the bottom surface of the lower plastic part 1, the substrate 3 is sleeved on the outer periphery of the second section 22, the upper plastic part 4 is sleeved on the outer periphery of the first section 21, and the first section 21 is fixedly connected with the upper plastic part 4 by compression of the first section 21 exposed to the upper plastic part 4, which helps to improve the connection stability of the two, reduces the dependence on the injection molding process, simplifies the manufacturing process, improves the production efficiency, and thus reduces the production cost.

[0050] In combination Figure 3 as shown, Figure 3 is a structural schematic diagram of the lower plastic part 1 provided in an embodiment of the present application. In some embodiments, there is a gap between the outer periphery of the second section 22 and the through hole 11.

[0051] Specifically, the lower plastic part 1 is provided with a through hole 11, and there is a gap between the through hole 11 and the outer periphery of the second section 22, which provides space for the installation of the sealing member 5.

[0052] In one of the embodiments, the battery cover plate assembly further comprises a sealing member 5, which is sleeved on the outer periphery of the second section 22, and the sealing member 5 is arranged in the gap.

[0053] Specifically, the sealing member 5 is sleeved on the outer periphery of the second section 22 of the pole column 2 and arranged in the gap between the through hole 11 of the lower plastic part 1 and the second section 22 of the pole column 2. The main function of the sealing member 5 is to prevent the leakage of liquid or gas inside the battery, and to ensure the safety and reliability of the battery.

[0054] In one of the embodiments, the substrate 3 is provided with a pole column hole 31, the second section 22 is arranged in the pole column hole 31, the inner diameter of the pole column hole 31 is smaller than the inner diameter of the through hole 11, and the substrate 3 is pressed on the sealing member 5.

[0055] Specifically, the substrate 3 is provided with a pole column hole 31, and the second section 22 of the pole column 2 is arranged in the through hole 11 and the pole column hole 31, respectively. The inner diameter of the pole column hole 31 is smaller than the inner diameter of the through hole 11 of the lower plastic part 1, so that the pole column hole 31 part of the substrate 3 can be tightly pressed on the sealing member 5, further enhancing the sealing effect. At the same time, the substrate 3 also plays the role of supporting and protecting the upper plastic part 4 and the first section 21 of the pole column 2.

[0056] In the specific implementation process, the sealing member 5 is sleeved on the outer periphery of the second section 22 of the pole column 2, the pole column 2 is arranged in the through hole 11 of the lower plastic part 1, and the sealing member 5 is ensured to be located in the gap. The substrate 3 is arranged above the lower plastic part 1, so that the second section 22 of the pole column 2 is arranged in the pole column hole 31 of the substrate 3 and is pressed on the sealing member 5. The upper plastic part 4 is sleeved on the outer periphery of the first section 21 of the pole column 2, and the upper plastic part 4 is fixedly connected with the first section 21 of the pole column 2 by the stamping process.

[0057] As described above, by setting the sealing member 5 between the through hole 11 of the lower plastic part 1 and the second section 22 of the pole post 2, and pressing the sealing member 5 on the pole post hole 31 of the base plate 3, the sealing performance of the battery cover plate assembly is effectively enhanced, preventing the leakage of liquid or gas inside the battery. Among them, the installation mode of the pole post 2 with segmented design and the sealing member 5 with matching gap simplifies the manufacturing process and improves production efficiency. By optimizing the structure and manufacturing process of the battery cover plate assembly, the manufacturing cost is reduced.

[0058] In combination with Figure 4 as shown, Figure 4 is a structural schematic diagram of the base plate 3 provided in an embodiment of the present application. In some embodiments, the periphery of the pole post hole 31 is provided with a mounting groove, and the surface of the upper plastic part 4 close to one side of the base plate 3 is provided with a mounting structure, which is embedded in the mounting groove.

[0059] Specifically, the pole post hole 31 is located at the periphery of the surface of the base plate 3 away from the lower plastic part 1, and is provided with a mounting groove. The shape and size of the mounting groove are matched with the mounting structure on the upper plastic part 4, to ensure stable installation and improve stability. Among them, the depth and width of the mounting groove are adaptively adjusted according to the mounting structure of the upper plastic part 4, to ensure that the mounting structure of the upper plastic part 4 can be firmly embedded therein.

[0060] Further, on the surface of the upper plastic part 4 close to one side of the base plate 3, a mounting structure matched with the mounting groove is provided, and the mounting structure is embedded in the mounting groove, to realize the close connection between the upper plastic part 4 and the base plate 3. The size, shape, etc. of the mounting structure can be adaptively adjusted according to specific use requirements, to ensure good cooperation and stable connection with the mounting groove.

[0061] As described above, by setting the mounting groove and the mounting structure to cooperate, the assembly process is simplified and the assembly efficiency is improved.

[0062] In one of the embodiments, the periphery of the pole post hole 31 is provided with an outward annular protrusion 32, and the surface of the annular protrusion 32 is provided with a tooth-shaped groove 33.

[0063] Specifically, the periphery of the pole post hole 31 of the base plate 3 is provided with an annular protrusion 32, which is outwardly protruding from the surface of the base plate 3 away from the lower plastic part 1. The main function of the annular protrusion 32 is to increase the contact area between the base plate 3 and the upper plastic part 4, thereby improving the stability and sealing performance of the battery cover plate assembly. In this embodiment, the shape and size of the annular protrusion 32 can be adaptively adjusted according to specific use requirements, to ensure good cooperation with the upper plastic part 4.

[0064] Further, on the surface of the annular protrusion 32, a tooth-shaped groove 33 is arranged. By arranging the tooth-shaped groove 33, the connection strength between the substrate 3 and the upper plastic part 4 is further enhanced, and the assembly accuracy of the battery cover plate assembly is improved. The shape, depth and pitch of the tooth-shaped groove 33 can be adaptively adjusted according to the specific use requirements to ensure that the mounting structure of the upper plastic part 4 is stably connected.

[0065] In combination Figure 6 as shown, Figure 6 is a structural schematic diagram of the upper plastic part 4 provided in an embodiment of the present application. In some embodiments, the upper plastic part 4 is provided with a mounting hole 41, and the second section 22 passes through the mounting hole 41; the periphery of the mounting hole 41 is provided with a mounting structure, which is an annular tooth 42.

[0066] Specifically, the upper plastic part 4 is provided with a mounting hole 41 for accommodating the passing of the pole column 2. The mounting hole 41 is matched in shape and size with the second section 22 of the pole column 2 to ensure that the second section 22 of the pole column 2 can smoothly pass into and be fixed in the upper plastic part 4. The first section 21 of the pole column 2 is exposed outside the mounting hole 41 to be connected with the external circuit.

[0067] Further, the periphery of the mounting hole 41 is provided with an annular tooth 42, and the annular tooth 42 on the periphery of the mounting hole 41 of the upper plastic part 4 cooperates with the annular protrusion 32 and the tooth-shaped groove 33 on the substrate 3 to increase the contact area and friction force of the upper plastic part 4 and the pole column 2, and further improve the stability of assembly. In this embodiment, the tooth shape, tooth pitch and height of the annular tooth 42 can be adjusted according to the actual application requirements to achieve the best assembly effect.

[0068] In combination Figure 5 as shown, Figure 5 is a structural schematic diagram of the pole column 2 provided in an embodiment of the present application. In some embodiments, the pole column 2 includes a first section 21, a second section 22 and a third section 23, the diameter of the second section 22 is smaller than that of the first section 21, and the diameter of the first section 21 is smaller than that of the third section 23.

[0069] Specifically, the second section 22 of the pole column 2 is smaller than the first section 21, which facilitates the assembly of the pole column 2 passing through the through hole 11 of the lower plastic part 1 and the pole column hole 31 of the substrate 3. The diameter of the third section 23 is larger than that of the first section 21 and the second section 22, and the third section 23 is arranged on the bottom surface of the lower plastic part 1 to increase the contact area of the third section 23 and the bottom surface of the lower plastic part 1 and improve the stability of the connection between the pole column 2 and the lower plastic part 1. The upper plastic part 4 is sleeved on the outer periphery of the second section 22 of the pole column 2, and the first section 21 at the top of the pole column 2 is subjected to stamping treatment, so that the diameter of the first section 21 is larger than that of the second section 22, to facilitate the connection and fixation of the first section 21 and the upper plastic part 4 and realize the assembly process.

[0070] In one embodiment, the first section 21 and the second section 22 are both circular in cross-section, and the third section 23 is polygonal in cross-section.

[0071] Specifically, the first section 21 and the second section 22 are both circular in cross-section, which facilitates the processing and manufacturing of the structure of the first section 21 and the second section 22, and ensures the smoothness of the pole 2 during the threading process. The third section 23 is polygonal in cross-section, such as square, hexagonal, octagonal, etc., which increases the contact area between the pole 2 and the lower plastic part 1, and enhances the mechanical stability of the pole 2 to prevent deformation in a particular direction.

[0072] In one embodiment, a fourth section 24 is further included, which is arranged above the first section 21, and the diameter of the fourth section 24 is smaller than that of the first section 21, and the fourth section 24 is outwardly convex.

[0073] Specifically, the fourth section 24 of the pole 2 is arranged above the first section 21, and the diameter of the fourth section 24 is smaller than that of the first section 21, forming an outward convex. By arranging the convex fourth section 24 on one side of the first section 21, the surface area of the pole 2 connected to the outside can be increased, and it can also be used for specific sealing or locking functions, while improving the overall strength of the pole 2.

[0074] As described above, through the multi-section design of the pole 2 and the close fit between the components, the stability and reliability of the battery cover plate assembly structure are achieved. In addition, by reducing or eliminating the use of injection molding process, the dependence on injection molding equipment and process is reduced, the manufacturing process is simplified, and the production cost is reduced. Furthermore, the design of standardized components makes the assembly process smoother and more efficient, speeding up the assembly process, shortening the production cycle, and improving the production efficiency.

[0075] In the present embodiment, a battery is also provided, which includes the battery cover plate assembly as described above.

[0076] Specifically, the battery cover plate assembly can include a positive electrode assembly and a negative electrode assembly, and the positive electrode assembly or the negative electrode assembly includes the pole 2, the lower plastic part 1, the base plate 3, and the upper plastic part 4. The base plate 3 is made of light aluminum plate material, which has good electrical conductivity. The upper plastic part 4 is designed in a standardized manner, and the first section 21 at the top of the pole 2 is subjected to stamping treatment, so that the pole 2 is fixedly connected to the upper plastic part 4, realizing the assembly process of the components.

[0077] Further, the battery cover plate assembly further includes an explosion-proof valve patch, which is used to release pressure when the internal pressure of the battery abnormally rises, preventing the battery from exploding.

[0078] As described above, the battery effectively simplifies the manufacturing process flow and improves production efficiency by using standardized components and a stamping process.

[0079] The technical features of the above-described embodiments can be combined in any manner. For brevity, not all possible combinations of the technical features in the above-described embodiments are described, but it should be understood that any combination of the technical features is within the scope of the present disclosure as long as the combination does not result in a contradiction.

[0080] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent application scope. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these are within the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A battery cover plate assembly, characterized by, The utility model relates to a battery cover plate assembly, comprising: a lower plastic part (1) provided with a through hole (11); a pole (2) comprising a first section (21), a second section (22) and a third section (23) connected in sequence, the first section (21) and the second section (22) being arranged in the through hole (11), and the third section (23) being arranged to abut against the bottom surface of the lower plastic part (1); a base plate (3) arranged above the lower plastic part (1) and sleeved around the second section (22); an upper plastic part (4) arranged above the base plate (3) and sleeved around the first section (21), the first section (21) being exposed from the upper plastic part (4) and being pressed to be fixedly connected with the upper plastic part (4).

2. The battery cover plate assembly of claim 1, wherein, a gap is formed between the outer periphery of the second section (22) and the through hole (11); a sealing member (5) is further arranged, the sealing member (5) being sleeved around the outer periphery of the second section (22) and being arranged in the gap.

3. The battery cover plate assembly of claim 2, wherein, the base plate (3) is provided with a pole hole (31), the second section (22) being arranged in the pole hole (31), the inner diameter of the pole hole (31) being smaller than the inner diameter of the through hole (11), and the base plate (3) being arranged on the sealing member (5).

4. The battery cover plate assembly of claim 3, wherein, an installation groove is arranged around the pole hole (31), and a mounting structure is arranged on the surface of the side of the upper plastic part (4) close to the base plate (3), the mounting structure being embedded in the installation groove.

5. The battery cover plate assembly of claim 4, wherein, an outward annular protrusion (32) is arranged around the pole hole (31), and a tooth-shaped groove (33) is arranged on the surface of the annular protrusion (32).

6. The battery cover plate assembly of claim 5, wherein, the upper plastic part (4) is provided with an installation hole (41), the second section (22) being arranged in the installation hole (41), and a mounting structure is arranged around the installation hole (41), the mounting structure being an annular tooth (42).

7. The battery cover plate assembly of any one of claims 1-6, wherein, the diameter of the second section (22) is smaller than the diameter of the first section (21), and the diameter of the first section (21) is smaller than the diameter of the third section (23).

8. The battery cover plate assembly of any one of claims 1-6, wherein, the cross sections of the first section (21) and the second section (22) are circular, and the cross section of the third section (23) is polygonal.

9. The battery cover plate assembly of any one of claims 1-6, wherein, a fourth section (24) is further arranged, the fourth section (24) being arranged above the first section (21), the diameter of the fourth section (24) being smaller than the diameter of the first section (21), and the fourth section (24) being an outward protrusion.

10. A battery, characterized by the utility model relates to a battery cover plate assembly, comprising: any one of claims 1-9.

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