Battery cover plate assembly and secondary battery

Abstract

The utility model relates to a battery cover plate assembly and a secondary battery. The battery cover plate assembly comprises a top cover piece, a pole column assembly and a sealing piece, and the top cover piece is provided with a pole column hole used for arranging the pole column assembly; the pole assembly comprises an upper pole and a lower pole, the upper pole is provided with a threaded hole, the lower pole comprises a lower pole body and a base, the base is arranged on the periphery of the lower pole body in a protruding mode, the periphery of the lower pole body is provided with external threads, the external threads are matched with the threaded hole, and the threaded hole is matched with the base. The lower pole is in threaded connection with the upper pole; and the sealing element is arranged at the periphery of the lower pole body and is positioned between the upper surface of the base and the lower surface of the top cover plate. According to the battery cover plate assembly, the pole assembling mode is simplified, the press fit of the sealing element is effectively ensured, and the safety performance of the battery is improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery cover assembly and a secondary battery. Background Art

[0002] The main components of common secondary batteries are the battery cell, the shell and the top cover. The top cover often involves the cooperation of multiple small parts and needs to be assembled. During assembly, the adapter pole is usually passed through the through hole of the top cover pole, and then connected from the top of the battery cell by welding. Such an assembly structure has the following problems:

[0003] (1) During welding after assembly, the yield is low and the manufacturing cost is high due to the influence of assembly clearance and welding process.

[0004] (2) When laser welding is used, the pole is more likely to conduct heat, causing the temperature of plastic materials such as the sealing gasket, insulating gasket, and lower plastic to rise, resulting in failure of the sealing and insulating properties, affecting the safety performance of the secondary battery.

[0005] (3) Foreign matter such as welding slag and metal chips generated during the welding process can easily fall into the battery through the top cover pole through-holes, causing the risk of poor insulation and affecting the safety of the battery cell.

[0006] Therefore, it is necessary to provide a secondary battery and related components that can solve the above-mentioned technical problems. Utility Model Content

[0007] In order to solve the above technical problems, the present application proposes a battery cover assembly and a secondary battery including the battery cover assembly.

[0008] The technical solution adopted by the present application to solve the above-mentioned technical problems is a battery cover assembly, including a top cover sheet, a pole assembly and a seal, wherein the top cover sheet has a pole hole for setting the pole assembly; the pole assembly includes an upper pole and a lower pole, the upper pole has a threaded hole, the lower pole includes a lower pole body and a base, the base is protruded from the periphery of the lower pole body, the outer periphery of the lower pole body has an external thread, the external thread and the threaded hole cooperate with each other, and are used to thread the lower pole and the upper pole; the seal is arranged on the periphery of the lower pole body, and is located between the upper surface of the base and the lower surface of the top cover sheet.

[0009] In one embodiment of the present application, the pole hole includes a through hole and a countersunk platform, the countersunk platform is arranged around the outer periphery of the through hole, the countersunk platform is recessed downward relative to the upper surface of the top cover plate, the upper pole is arranged on the countersunk platform, and the threaded hole is coaxial with the through hole.

[0010] In one embodiment of the present application, the lower pole body is penetrated through both the through hole and the threaded hole.

[0011] In one embodiment of the present application, the lower pole body includes a first column portion and a second column portion from bottom to top. When the lower pole and the upper pole are threadedly connected, the second column portion is close to the upper pole, and the external thread is arranged on at least a portion of the outer periphery of the second column portion.

[0012] In one embodiment of the present application, the external thread is also provided on the outer periphery of the first cylindrical portion.

[0013] In one embodiment of the present application, an upper insulating member is further included, which is arranged between the sink and the upper pole, and the upper pole is pressed together with the upper insulating member.

[0014] In an embodiment of the present application, when the lower pole and the upper pole are threadedly connected, the external thread does not contact the upper insulating member.

[0015] In an embodiment of the present application, the sealing member is also located between the upper insulating member and the outer periphery of the lower pole body.

[0016] In one embodiment of the present application, a lower insulating member is further included, wherein the lower insulating member is arranged below the top cover sheet, and the upper surface of the base is pressed together with the lower surface of the lower insulating member.

[0017] In order to solve the above technical problems, the present application also proposes a secondary battery, comprising the battery cover assembly as described above.

[0018] The pole assembly in the battery cover assembly of the present application includes an upper pole and a lower pole, the upper pole has a threaded hole, the lower pole has an external thread, the external thread and the threaded hole cooperate with each other to thread the lower pole and the upper pole, and a seal is provided on the outer periphery of the lower pole body. The battery cover assembly of the present application has the following beneficial effects:

[0019] (1) The upper pole and the lower pole are fastened and connected by screwing, which simplifies the pole assembly method, and applies extrusion force to the seal during screwing, which can effectively ensure the compression of the seal.

[0020] (2) The screw connection method can reduce the space occupied by the pole inside the shell, improve space utilization, and increase energy density.

[0021] (3) Since the upper pole and the lower pole are fixedly connected by screw connection, laser welding is no longer required. Laser seam welding can also be performed at the threaded interface. Since the upper pole and the lower pole body are threadedly connected, even if welding slag is generated, it is not easy for the welding slag or external foreign matter to fall into the battery through the thread gap, thereby improving the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings, wherein:

[0023] Figure 1 is a three-dimensional cross-sectional view of a battery cover assembly according to Embodiment 1 of the present application;

[0024] Figure 2 is a side view of the battery cover assembly of the first embodiment of the present application;

[0025] Figure 3 yes Figure 2 An enlarged schematic diagram of region A in FIG.

[0026] Figure 4 yes Figure 2 Explosion diagram of

[0027] Figure 5 is a three-dimensional cross-sectional view of a battery cover assembly according to Embodiment 2 of the present application;

[0028] Figure 6 is a side view of a battery cover assembly according to Embodiment 2 of the present application;

[0029] Figure 7 yes Figure 6 An enlarged schematic diagram of region B in FIG.

[0030] Figure 8 yes Figure 6 Explosion diagram. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below with reference to the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and therefore the present application is not limited to the specific embodiments disclosed below.

[0033] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0034] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0035] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0036] Below, the embodiments of the present application are described based on the accompanying drawings. However, the embodiments shown below are examples of battery cover assemblies and secondary batteries for concretizing the technical ideas of the present application, and the battery cover assemblies and secondary batteries of the present application are not specific to the following contents. Furthermore, in order to facilitate the understanding of the scope of the claims, this specification assigns numbers corresponding to the components shown in the embodiments to the components shown in the "Claims" and "Application Contents" columns. However, the components shown in the claims are by no means specific to the components of the embodiments. In particular, the size, material, shape, and relative configuration of the constituent components recorded in the embodiments, if there is no specific record, is not intended to limit the scope of the present application to this, but is just an illustrative example.

[0037] However, the dimensions or positional relationships of the components shown in the drawings are sometimes exaggerated for the purpose of clarifying the description. Furthermore, in the following description, for the same names and symbols, representing the same or homogeneous components, it is appropriate to omit their detailed description. Furthermore, the various elements constituting the present application may be in the form of a plurality of elements constituted by the same components so that one component serves as a plurality of elements, or conversely, it may be realized by a plurality of components sharing the function of a component. In addition, the contents described in some embodiments and implementation methods may also be utilized in other embodiments, implementation methods, etc. In addition, in this specification, "on" is not limited to the case where it is formed in contact with the upper surface, but also includes the case where it is formed separately on the upper surface, and is also used to include the meaning of the existence of an intervening layer between layers.

[0038] The battery cover assembly of the present application can be used for any type of battery, not limited to secondary batteries. The present application does not limit the type of secondary batteries, which can be lithium batteries, sodium batteries, potassium batteries, etc.

[0039] Figure 1 to Figure 4 It is used to illustrate the first embodiment of the present application.

[0040] Figure 1 It is a three-dimensional cross-sectional view of the battery cover assembly of Example 1 of the present application. Figure 1 The battery cover assembly 100 is cut by a cutting line extending along the width direction Y and is cut in the center along the thickness direction X. Figure 2 It is a side view of the battery cover assembly of Example 1 of the present application. Figure 3 yes Figure 2 An enlarged schematic diagram of area A in FIG. Figure 4 yes Figure 2 Explosion diagram.

[0041] Combination Figure 1 to Figure 4 As shown, the battery cover plate assembly 100 includes a top cover sheet 110 and a pole assembly. The top cover sheet 110 is square and is used for square secondary batteries. The top cover sheet 110 is a sheet-like structure or a plate-like structure, which has a certain height along the height direction Z, and a countersunk hole or a through hole can be set therein. In this embodiment, the top cover sheet 110 has two pole holes 111, which correspond to the positive and negative poles of the secondary battery respectively. The pole assembly includes an upper pole 210 and a lower pole 220. As shown in FIG. Figure 1 As shown, the battery cover assembly 100 of the present application includes two sets of pole assemblies, corresponding to the positive electrode and the negative electrode of the secondary battery respectively. This specification takes an pole hole 11, an upper pole 210 and a lower pole 220 corresponding to either the positive electrode or the negative electrode as an example for description.

[0042] like Figure 1 As shown, the middle part of the upper pole 210 has a threaded hole 211, and more specifically, the hole wall of the threaded hole 211 has an internal thread. The lower pole 220 includes a lower pole body 230 and a base 240, the base 240 is convexly arranged on the periphery of the lower pole body 230, and the outer periphery of the lower pole body 230 has an external thread 221. The external thread 221 is adapted to the internal thread of the threaded hole 211, so that when the upper pole 210 and the lower pole 220 are assembled, the two can be threadedly connected. The present application does not limit the specific shape, pitch, etc. of the internal thread and the external thread 221.

[0043] Further explanation, the upper pole 210 is a cylinder, the threaded hole 211 is a circular hole, and the upper pole 210 and the threaded hole 211 are coaxially arranged. The lower pole body 230 is a cylinder. When the lower pole 220 is inserted into the threaded hole 211 from bottom to top, the lower pole 220 and the upper pole 210 are coaxial.

[0044] like Figure 1 As shown, in the two pole assemblies, the lower pole body 230 and the base 240 in the lower pole 220 in the pole assembly corresponding to the negative pole are usually a composite structure formed by friction welding of copper and aluminum plates. Therefore, the lower pole body 230 and the base 240 in the lower pole 220 corresponding to the negative pole are usually two independent parts, which can be connected together by welding. After the lower pole 220 is screwed with the upper pole 210, the upper surface of the lower pole body 230 is exposed, which is subsequently used for welding with a busbar, so the lower pole body 230 is preferably made of aluminum. The lower pole 220a in the pole assembly corresponding to the positive pole includes an integrally formed lower pole body 230a and a base 240a.

[0045] Combination Figure 1 and Figure 3 As shown, the seal 310 is arranged at the periphery of the lower pole body 230 and is located between the upper surface of the base 240 and the lower surface of the top cover sheet 110. In this embodiment, the seal 310 is specifically implemented as a sealing ring. In other embodiments, the seal 310 may not be a continuous sealing ring, but a plurality of sealing segments, which are jointly arranged at the periphery of the lower pole body 230, and can also play a sealing role.

[0046] In some embodiments, one or more small holes (not shown) are provided on the upper surface of the upper pole 210 . These small holes may be through holes or countersunk holes. The upper pole 210 may be rotated using a specific tool so that the upper pole 210 is screwed to the lower pole 220 .

[0047] According to the first embodiment of the present application, the upper pole 210 and the lower pole 220 can be fastened and connected in a screw connection manner, which simplifies the pole assembly method, and applies a squeezing force to the seal 310 during the screw connection, which can effectively ensure the pressing of the seal 310. Since the seal 310 has a certain elasticity, the height difference between the lower pole 220 and the upper pole 210 can also be controlled by squeezing the seal 310 during the screw connection. Figure 3As shown, after being screwed, the upper surface of the upper pole 210 is flush with the upper surface of the lower pole body 230. In the prior art, in order to make the pole extend out of the top cover pole through hole, it is necessary for the support mechanism of the equipment to provide an upward support force. The support mechanism is preferably an inverted U-shaped or T-shaped steel plate, which is supported between the base 240 of the lower pole 220 and the pole ear at the top of the battery cell, so that the sealing ring is compressed. After the pole extends out of the top cover pole through hole, laser welding is performed, and the support mechanism can be withdrawn after welding. The support mechanism of the equipment will occupy a certain space inside the secondary battery, which is equivalent to limiting the space of the battery cell assembly, reducing the space utilization rate inside the secondary battery, and due to the limited volume of the battery cell assembly, the energy density of the secondary battery is also reduced. The present application cancels the support mechanism of the equipment by screwing, which can reduce the space occupied by the pole in the shell, improve the space utilization rate, and increase the energy density. In addition, the use of the support mechanism of the equipment will also cause the height of the pole extending out of the top cover pole through hole to be different, which is not conducive to controlling the consistency of the height of the pole. The present application can ensure the consistency of the height difference between the lower pole 220 and the upper pole 210 in different batteries by screwing. On the other hand, since the upper pole 210 and the lower pole 220 are fixedly connected by screwing, there is no need for laser welding. Laser seam welding can also be performed at the threaded interface. Since the upper pole 210 and the lower pole body 230 are threadedly connected, even if welding slag is generated, the welding slag or external foreign matter is not easy to fall into the battery through the thread gap, thereby improving the battery safety performance.

[0048] It should be noted that in the existing solution using the top cover pole through hole, there is a problem of insufficient sealing ring compression. The present application can achieve effective compression of the seal 310 through the limiting effect of the thread distance and the base 240, ensure airtightness, and improve the safety of the battery cell.

[0049] It should be noted that the lower pole 220 in the present application may also be referred to as a transition piece pole. Figure 1 The battery cover assembly 100 of this embodiment does not include other adapters, but the lower pole 220 is used as the adapter. Specifically, the base 240 can be considered as an adapter, which has an upwardly protruding lower pole body 230. In the secondary battery, the base 240 is electrically connected to the tab at the top of the battery cell, so that the tab is electrically connected to the upper pole 210.

[0050] Further, refer to Figure 1 As shown, the pole hole 111 includes a through hole 121 and a sink 120. The sink 120 is arranged around the outer periphery of the through hole 121. The sink 120 is recessed downward relative to the upper surface of the top cover sheet 110. The upper pole 210 is arranged on the sink 120, and the threaded hole 211 is coaxial with the through hole 121.

[0051] refer to Figure 3As shown, the lower pole body 230 is simultaneously penetrated in the through hole 121 and the threaded hole 211. In the first embodiment, the outer circumference of the lower pole body 230 is entirely provided with external threads 221.

[0052] like Figure 1 to Figure 4 As shown, the first embodiment also includes an upper insulating member 410, which is disposed between the sink 120 and the upper pole 210, and the upper pole 210 is pressed together with the upper insulating member 410. The material of the upper insulating member 410 can be plastic, so it can also be called upper plastic. Figure 3 As shown, the upper insulating member 410 also has a through hole, and the size of the through hole should be greater than or equal to the size of the threaded hole 211 or the through hole 121 of the pole hole 111. The cross-sectional shape of the upper insulating member 410 is L-shaped, that is, the upper insulating member 410 also has a sink. The upper insulating member 410 is arranged on the sink 120 of the pole hole 111, and the upper pole 210 is arranged on the sink of the upper insulating member 410. The upper insulating member 410 surrounds the outer periphery of the upper pole 210. When the upper pole 210 and the lower pole 220 are screwed together, the extrusion force generated will be transmitted to the upper insulating member 410, thereby increasing the sealing and tightness of the battery cover assembly 100. It should be noted that there are two upper insulating members 410 in this embodiment, corresponding to the positive pole and the negative pole respectively.

[0053] In the first embodiment, the seal 310 may also be located between the upper insulating member 410 and the outer periphery of the lower pole body 230. The embodiment of the seal 310 is not shown in the figure. Figure 3 It is conceivable that the cross section of the seal 310 may be L-shaped, and its vertical section may extend from bottom to top, so as to be sandwiched between the inner wall of the through hole of the upper insulating member 410 and the outer periphery of the lower pole body 230. By designing such an L-shaped seal 310, the sealing ability can be further improved, and welding slag can be further prevented from falling into the battery.

[0054] like Figure 1 to Figure 4 As shown, the first embodiment further includes a lower insulating member 420. In this embodiment, a lower insulating member 420 is disposed below the top cover sheet 110. The lower insulating member 420 is provided with two through holes corresponding to the two lower poles 220. Figure 3 As shown, the upper surface of the base 240 is pressed and arranged with the lower surface of the lower insulating member 420. The seal 310 may or may not be in contact with the inner wall of the through hole of the lower insulating member 420. The through hole on the lower insulating member 420 may be slightly larger than the through hole 121 in the pole hole 111, so that there is a certain gap between the seal 310 and the inner wall of the through hole of the lower insulating member 420, providing a deformation space for the seal 310. When screwing, the height of the upper pole 210 and the lower pole 220 can be adjusted by squeezing the seal 310. The deformation space provides a larger adjustable range for height adjustment.

[0055] Figures 5 to 8 The second embodiment of the present application is used to illustrate the second embodiment. The difference between the second embodiment and the first embodiment lies in the arrangement of the external thread 221. For other similar structures, reference may be made to the description of the first embodiment, and the same contents will not be repeated. Figures 5 to 8 Some similar structures are marked in the figure, and the same reference numerals as those in the first embodiment are used.

[0056] Figure 5 It is a three-dimensional cross-sectional view of the battery cover assembly of the second embodiment of the present application. Figure 6 It is a side view of the battery cover assembly of the second embodiment of the present application. Figure 7 yes Figure 6 An enlarged schematic diagram of region B in FIG. Figure 8 yes Figure 6 Exploded diagram of the . Figures 5 to 8 As shown, the lower pole 520 includes a lower pole body 530 and a base 540. The base 540 is protruded from the periphery of the lower pole body 530. The outer periphery of the lower pole body 530 has an external thread 521. Figure 7 As shown, the lower pole body 530 is divided from bottom to top into a first column portion 5301 and a second column portion 5302. In some embodiments, the external thread 521 is only provided on at least a portion of the periphery of the second column portion 5302. More specifically, in the second embodiment, the external thread 521 is only provided on the entire periphery of the second column portion 5302. According to the second embodiment, when the lower pole 520 is threadedly connected to the upper pole 210, the external thread 521 does not contact the inner wall of the through hole of the upper insulating member 410, or does not contact the inner wall of the through hole 121 of the top cover sheet 110, or does not contact the inner wall of the through hole of the lower insulating member 420, or does not contact the sealing member 310.

[0057] In embodiment two, the cross-section of the sealing member 310 may be L-shaped, and its vertical section may extend upward from the upper surface of the base 540 to the lower end of the external thread 521, that is, the inner side of the vertical section contacts the outer periphery of the first column portion 5301, and the outer side of the vertical section contacts the inner wall of the through hole 121 of the top cover plate 110 and the inner wall of the through hole of the upper insulating member 410, respectively.

[0058] In other embodiments, the external thread 521 may be located only on a portion of the outer circumference of the second column portion 5302. The portion of the outer circumference may be a portion of the outer circumference of the second column portion 5302 close to the upper portion.

[0059] The beneficial effects of the second embodiment are the same as those of the first embodiment, and the thread design is simpler.

[0060] The present application also includes a secondary battery, which may include the battery cover assembly of any embodiment described above. The secondary battery using the battery cover assembly of the present application has the following beneficial effects: easy assembly, high space utilization, high energy density, good safety performance, etc.

[0061] Although the above disclosure discusses some currently useful application embodiments through various examples, it should be understood that such details are for illustrative purposes only, and the appended claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that are consistent with the essence and scope of the embodiments of the present application. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only by software solutions, such as installing the described system on an existing server or mobile device.

[0062] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more application embodiments, in the above description of the embodiments of this application, multiple features are sometimes merged into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0063] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0064] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A battery cover assembly, characterized in that: It includes a top cover sheet, a pole assembly and a seal, wherein: The top cover sheet has a pole hole for arranging a pole assembly; The pole assembly comprises an upper pole and a lower pole, the upper pole has a threaded hole, the lower pole comprises a lower pole body and a base, the base is convexly arranged on the periphery of the lower pole body, the outer periphery of the lower pole body has an external thread, the external thread and the threaded hole cooperate with each other, and are used to thread the lower pole and the upper pole; The sealing member is arranged on the periphery of the lower pole body and is located between the upper surface of the base and the lower surface of the top cover sheet.

2. The battery cover assembly according to claim 1, characterized in that: The pole hole comprises a through hole and a sink, the sink is arranged around the outer periphery of the through hole, the sink is recessed downward relative to the upper surface of the top cover sheet, the upper pole is arranged on the sink, and the threaded hole is coaxial with the through hole.

3. The battery cover assembly according to claim 2, characterized in that: The lower pole body is simultaneously penetrated in the through hole and the threaded hole.

4. The battery cover assembly according to claim 3, characterized in that: The lower pole body includes a first column portion and a second column portion from bottom to top. When the lower pole and the upper pole are threadedly connected, the second column portion is close to the upper pole, and the external thread is arranged on at least a portion of the outer circumference of the second column portion.

5. The battery cover assembly according to claim 4, characterized in that: The external thread is also arranged on the outer circumference of the first cylindrical portion.

6. The battery cover assembly according to claim 2, characterized in that: It also includes an upper insulating member, which is arranged between the sink and the upper pole, and the upper pole is pressed together with the upper insulating member.

7. The battery cover assembly according to claim 6, characterized in that: When the lower pole and the upper pole are threadedly connected, the external thread does not contact the upper insulating member.

8. The battery cover assembly according to claim 6, characterized in that: The seal is also located between the upper insulator and the outer periphery of the lower pole body.

9. The battery cover assembly according to claim 1, characterized in that: It also includes a lower insulating member, which is arranged below the top cover sheet, and the upper surface of the base is pressed and arranged with the lower surface of the lower insulating member.

10. A secondary battery, characterized in that: It comprises a battery cover assembly as claimed in any one of claims 1 to 9.

Images