Pole and cover assembly

Abstract

The present invention provides a pole and cover plate assembly, which relates to the field of battery technology. The pole includes a base plate, a pole body and a fastener. The pole body is provided with a fixing hole, which extends in a predetermined direction. A portion of the fastener passes through the base plate and extends into the fixing hole, and is threadedly connected with the hole wall of the fixing hole. Another portion of the fastener can limit the position of the base plate in the predetermined direction. In this way, the connection between the pole body and the base plate is achieved through the fastener. When the pole body or the base plate is damaged, the fastener can be screwed to separate the pole body from the base plate, so that the damaged portion can be replaced, thereby reducing the cost of pole maintenance.

Description

Technical Field

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

[0002] As lithium-ion battery technology matures, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the requirements for the performance and safety of lithium-ion batteries are increasing. The cover is an important component of lithium-ion batteries, and its structural design is crucial to the safety of the battery cell.

[0003] The cover plate generally includes a pole, an upper plastic, a plain aluminum plate and a lower plastic. The pole includes a pole body and a bottom plate. The pole body is welded to the bottom plate by friction welding. When the pole body or the bottom plate is damaged, the entire pole needs to be replaced, and the cost of pole maintenance is high. Summary of the invention

[0004] In view of this, the present application provides a pole and cover plate assembly to solve the problem that when the pole body or the base plate is damaged, the entire pole needs to be replaced, and the cost of pole maintenance is high.

[0005] According to one aspect of the present application, a pole is provided, which includes a base plate, a pole body and a fastener. The pole body is provided with a fixing hole, which extends along a predetermined direction. A portion of the fastener passes through the base plate and extends into the fixing hole, and is threadedly connected to the hole wall of the fixing hole. Another portion of the fastener can limit the position of the base plate in the predetermined direction.

[0006] Preferably, the bottom plate comprises a first placement groove, the first placement groove is recessed from a side of the bottom plate facing away from the pole body toward the inside of the bottom plate, and the first placement groove comprises a limiting surface perpendicular to the predetermined direction;

[0007] The fastener includes a first fastening portion and a second fastening portion, the first fastening portion is located in the first placement groove and abuts against the limiting surface, and the second fastening portion passes through the bottom plate and is threadedly connected to the hole wall of the fixing hole.

[0008] Preferably, the bottom plate further comprises a second placement groove, the second placement groove is recessed from a side of the bottom plate facing the pole body toward the inside of the bottom plate, and the second placement groove is communicated with the first placement groove;

[0009] The pole body comprises a mounting member and a protruding member, wherein the protruding member is connected to a side of the mounting member facing away from the bottom plate, the mounting member is located inside the second placement groove, and the protruding member protrudes from the bottom plate.

[0010] According to another aspect of the present application, a cover plate assembly is provided, and the cover plate assembly includes the above-mentioned pole.

[0011] Preferably, the cover plate assembly further includes a cover plate body, a first plastic part, a second plastic part and a connecting part, the pole passes through the second plastic part, the cover plate body, the first plastic part and the connecting part, and the pole is connected to the connecting part.

[0012] Preferably, the cover plate assembly further comprises a first protective member, wherein the first protective member is connected to the connecting member and covers the end of the pole body facing away from the bottom plate.

[0013] Preferably, the connecting member includes a first connecting groove, a second connecting groove and a third connecting groove which are interconnected, the first connecting groove is located on the side of the second connecting groove facing away from the cover plate body, the pole passes through the first connecting groove and the second connecting groove, and the first protective member is located in the first connecting groove and connected to the bottom surface of the first connecting groove.

[0014] Preferably, the cover plate assembly further comprises a pressure ring, an abutting portion and an explosion-proof valve, the cover plate body is provided with a receiving hole, the abutting portion surrounds the receiving hole, and a portion of the abutting portion protrudes relative to the middle portion of the receiving hole;

[0015] The pressure ring is connected to the hole wall of the accommodating hole, and the explosion-proof valve is located between the pressure ring and the abutting portion.

[0016] Preferably, the cover plate assembly further comprises a sealing member, wherein the sealing member covers an edge of the explosion-proof valve, and the sealing member abuts against the pressure ring and the abutting portion respectively.

[0017] Preferably, the second plastic part includes a limiting groove, which is recessed from the side of the second plastic part facing away from the cover body to the interior of the second plastic part, and a first through hole penetrating the second plastic part is provided on the bottom surface of the limiting groove, and parts of the bottom plate and the pole body are located in the limiting groove, and another part of the pole body passes through the first through hole, the cover body, the first plastic part and the connecting piece, and is connected to the connecting piece.

[0018] In the pole of the present application, the pole includes a base plate, a pole body and a fastener, the pole body is provided with a fixing hole, the fixing hole extends in a predetermined direction, a part of the fastener passes through the base plate and extends into the fixing hole, and is threadedly connected with the hole wall of the fixing hole, and another part of the fastener can limit the position of the base plate in the predetermined direction. In this way, the connection between the pole body and the base plate is achieved through the fastener, and when the pole body or the base plate is damaged, the fastener can be screwed to separate the pole body from the base plate, so that the damaged part can be replaced, thereby reducing the cost of pole maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram showing the three-dimensional structure of the pole group;

[0021] Figure 2 A cross-sectional view of a pole body is shown;

[0022] Figure 3 showing a cross-sectional view of the base plate;

[0023] Figure 4 showing a cross-sectional view of a pole group;

[0024] Figure 5 An exploded view showing one perspective of the cover plate assembly;

[0025] Figure 6 An exploded view showing another perspective of the cover plate assembly;

[0026] Figure 7 A cross-sectional view showing a connector;

[0027] Figure 8 A cross-sectional view showing a cover plate assembly;

[0028] Fig. 9 Show Figure 8 An enlarged view of part A in FIG.

[0029] Fig.10 Show Figure 8 Magnified view of part B.

[0030] Icons: 1-pole; 11-pole body; 111-mounting member; 112-protruding member; 1121-first protruding portion; 1122-second protruding portion; 1123-third protruding portion; 113-fixing hole; 12-bottom plate; 121-first placement groove; 1211-first placement hole; 1212-second placement hole; 1213-third placement hole; 1214-limiting surface; 122-second placement groove; 13-fastener; 131-first fastening portion; 1311-first part; 1312-second part ;132-second fastening portion;21-cover body;211-second through hole;212-accommodating hole;22-abutting portion;3-first plastic part;4-second plastic part;41-limiting groove;42-first through hole;5-connecting piece;51-first connecting groove;52-second connecting groove;53-third connecting groove;61-sealing ring;611-first sealing part;612-second sealing part;62-sealing piece;71-first protective piece;72-second protective piece;8-pressure ring;9-explosion-proof valve;S-predetermined direction. DETAILED DESCRIPTION

[0031] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0032] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0033] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0034] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0035] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0036] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0037] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0038] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0039] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0040] According to one aspect of the present application, a pole 1 is provided, such as Figures 1 to 4 As shown, the pole 1 includes a bottom plate 12, a pole body 11 and a fastener 13. The pole body 11 is provided with a fixing hole 113, which extends along a predetermined direction S. A portion of the fastener 13 passes through the bottom plate 12 and extends into the fixing hole 113, and is threadedly connected with the hole wall of the fixing hole 113. Another portion of the fastener 13 can limit the position of the bottom plate 12 in the predetermined direction S. In this way, the connection between the pole body 11 and the bottom plate 12 is achieved through the fastener 13. When the pole body 11 or the bottom plate 12 is damaged, the fastener 13 can be screwed to separate the pole body 11 from the bottom plate 12, so that the damaged portion can be replaced, thereby reducing the cost of repairing the pole 1.

[0041] In addition, the base plate 12 of the pole 1 and the pole body 11 are connected by fasteners 13, which allows the pole ears in the bare battery cell to be directly welded to the base plate 12 without adding connecting plates for connecting the pole 1 and the pole ears, thereby reducing the manufacturing cost of the battery cell and maximizing the space inside the battery cell shell.

[0042] In the embodiments of the present application, Figure 3 and Figure 4As shown, the bottom plate 12 includes a first placement groove 121 and a second placement groove 122, the first placement groove 121 is recessed from the side of the bottom plate 12 facing away from the pole body 11 to the inside of the bottom plate 12, and the second placement groove 122 is recessed from the side of the bottom plate 12 facing the pole body 11 to the inside of the bottom plate 12, and the second placement groove 122 is connected to the first placement groove 121. The first placement groove 121 and the second placement groove 122 are used to accommodate the fastener 13 and the pole body 11, respectively, so as to ensure the stability of the installation between the bottom plate 12 and the pole body 11.

[0043] like Figure 3 and Figure 4 As shown, the fastener 13 includes a first fastening portion 131 and a second fastening portion 132, the diameter of the first fastening portion 131 is larger than the diameter of the second fastening portion 132, the first fastening portion 131 is located in the first placement groove 121, the first placement groove 121 includes a limiting surface 1214 perpendicular to the predetermined direction S, and the first fastening portion 131 abuts against the limiting surface 1214, thereby achieving the fixation between the bottom plate 12 and the pole body 11. The outer surface of the second fastening portion 132 is provided with a thread, and the second fastening portion 132 passes through the fixing hole 113 and is threadedly connected with the hole wall of the fixing hole 113. The first placement groove 121 can be used to limit the position of the fastener 13 to ensure the stability of the installation between the bottom plate 12 and the pole body 11.

[0044] Optionally, the first placement groove 121 includes a first placement hole 1211, a second placement hole 1212 and a third placement hole 1213 arranged along a predetermined direction S, the first placement hole 1211 is connected to the second placement groove 122, the diameter of the third placement hole 1213 is larger than the diameter of the second placement hole 1212, and the diameter of the second placement hole 1212 is larger than the diameter of the first placement hole 1211, so that the connection between the first placement hole 1211 and the second placement hole 1212 is stepped, and the limiting surface 1214 is located at the connection between the first placement hole 1211 and the second placement hole 1212, and the limiting surface 1214 is perpendicular to the predetermined direction S. The first fastening portion 131 includes a first portion 1311 and a second portion 1312 connected to each other, the pole body 11 is connected to the second portion 1312, the second placement hole 1212 and the third placement hole 1213 are used to accommodate the first portion 1311, the first portion 1311 is in contact with the hole wall of the second placement hole 1212, the end surface of the first portion 1311 facing the second portion 1312 is perpendicular to the predetermined direction S, and the end surface of the first portion 1311 facing the second portion 1312 is in contact with the limiting surface 1214. The second portion 1312 is located in the first placement hole 1211 and is in contact with the hole wall of the first placement hole 1211. In this way, the pole body 11 is connected to the fastener 13, and the fastener 13 can be fixed to the pole body 11. The pole body 11 cooperates with the fastener 13 to fix the bottom plate 12.

[0045] Preferably, the fastener 13 may be made of stainless steel so that the fastener 13 has sufficient strength to ensure the stability of the connection between the bottom plate 12 and the pole body 11 .

[0046] Furthermore, if Figure 2 , Figure 3 and Figure 4 As shown, the pole body 11 includes a mounting member 111 and a protruding member 112, the protruding member 112 is connected to the side of the mounting member 111 facing away from the bottom plate 12 in a predetermined direction S, and the mounting member 111 is located inside the second placement groove 122, so that the second placement groove 122 can define the position of the pole body 11. Preferably, the end surface of the mounting member 111 is flush with the end surface of the bottom plate 12.

[0047] like Figure 2 and Figure 4 As shown, the protruding member 112 includes a first protruding portion 1121, a second protruding portion 1122 and a third protruding portion 1123 which are sequentially connected along a predetermined direction S. The first protruding portion 1121 is connected to the mounting member 111. The diameter of the first protruding portion 1121 is greater than the diameter of the second protruding portion 1122. The diameter of the first protruding portion 1121 is greater than the diameter of the third protruding portion 1123. The diameter of the third protruding portion 1123 is greater than the diameter of the second protruding portion 1122. By configuring the protruding member 112 in the above-mentioned form, it is possible to facilitate the connection of the protruding member 112 with the connecting member 5 in the cover plate assembly.

[0048] Optionally, a groove may be provided on the surface of the bottom plate 12 facing away from the pole body 11, and the fastener 13 may be spot welded to the bottom plate 12 at the groove, thereby limiting the position of the fastener 13 to ensure the stability of the fixation between the bottom plate 12 and the pole body 11. When the bottom plate 12 and the pole body 11 are disassembled, the fastener 13 may be screwed to break the spot welding, thereby screwing the fastener 13 out of the pole body 11, thereby separating the bottom plate 12 and the pole body 11.

[0049] According to another aspect of the present application, a cover plate assembly is provided, such as Figure 5 , Figure 6 and Figure 8 As shown, the cover assembly includes a cover body 21, a first plastic part 3, a second plastic part 4, a connector 5 and the above-mentioned pole 1, the first plastic part 3 and the second plastic part 4 are respectively located on both sides of the cover body 21, and the pole 1 passes through the second plastic part 4, the cover body 21, the first plastic part 3 and the connector 5, and is connected to the connector 5. In this way, the assembly of the cover assembly can be achieved by matching the pole 1 with the connector 5.

[0050] like Figure 5 , Figure 8 and Fig. 9As shown, the second plastic part 4 includes a limiting groove 41, which is recessed from the side of the second plastic part 4 facing away from the cover body 21 along a predetermined direction S toward the inside of the second plastic part 4, and a first through hole 42 penetrating the second plastic part 4 along the predetermined direction S is formed on the bottom surface of the limiting groove 41. Parts of the bottom plate 12 and the pole body 11 are located in the limiting groove 41, and another part of the pole body 11 passes through the first through hole 42, the cover body 21, the first plastic part 3 and the connector 5, and is connected to the connector 5, thereby realizing the assembly of the cover assembly.

[0051] like Figure 6 , Figure 7 and Fig. 9 As shown, the first plastic part 3 has a placement groove, and the connecting member 5 is arranged in the placement groove and abuts against the bottom surface of the placement groove. The connecting member 5 is provided with a first connection groove 51, a second connection groove 52 and a third connection groove 53, which are connected in sequence and pass through the connecting member 5. The diameter of the first connection groove 51 is larger than the diameter of the second connection groove 52, and the diameter of the second connection groove 52 is larger than the diameter of the third connection groove 53. The first protrusion 1121 of the pole body 11 passes through the second through hole 211 on the cover body 21 and the first through hole 42 on the second plastic part 4, the second protrusion 1122 is located in the third connection groove 53, and the third protrusion 1123 is located in the second connection groove 52, thereby realizing the connection between the connecting member 5 and the pole body 11.

[0052] Alternatively, if Figure 6 and Fig. 9 As shown, the cover assembly also includes a sealing ring 61, which includes a first sealing portion 611 and a second sealing portion 612. The first sealing portion 611 is sleeved on the first protruding portion 1121, and the second sealing portion 612 protrudes from the outside of the first sealing portion 611. The outer side walls of the first sealing portion 611 are respectively in contact with the hole walls of the second through hole 211, and the upper surface of the second sealing portion 612 is in contact with the lower surface of the cover body 21. The lower surfaces of the first sealing portion 611 and the second sealing portion 612 are both in contact with the mounting member 111, and the outer diameter of the second sealing portion 612 is smaller than the diameter of the mounting member 111. By cooperating with the sealing ring 61, the cover body 21, the second plastic part 4 and the first plastic part 3, the risk of poor sealing of the cover assembly can be reduced.

[0053] In the embodiments of the present application, Figure 7 and Fig. 9 As shown, the cover plate assembly also includes a first protective member 71, which is connected to the connecting member 5 and covers the end of the pole body 11 facing away from the base plate 12. The first protective member 71 covers the end of the pole body 11, which can reduce the risk of oxidation of the end of the pole body 11.

[0054] Furthermore, the first protective member 71 is located in the first connecting groove 51. Since the diameter of the first connecting groove 51 is larger than the diameter of the second connecting groove 52, the connection between the first connecting groove 51 and the second connecting groove 52 is stepped. The first protective member 71 is connected to the bottom surface of the first connecting groove 51, which can prevent the first protective member 71 from being exposed to the outside of the connecting member 5, thereby improving the stability of the fixation of the first protective member 71.

[0055] Optionally, the first protective member 71 may be a sheet structure made of PP (polypropylene) material, and an adhesive layer is provided on the edge of the first protective member 71 so as to bond the first protective member 71 to the bottom surface of the first connecting groove 51 .

[0056] In the embodiments of the present application, Figure 6 , Figure 7 and Fig.10 As shown, abutment portion 22 is provided on the side of cover body 21 facing away from second plastic part 4, a receiving hole 212 is provided on cover body 21, abutment portion 22 surrounds receiving hole 212, and part of abutment portion 22 protrudes relative to the middle of receiving hole 212. Optionally, cover body 21 may be a plain aluminum plate, abutment portion 22 and receiving hole 212 may be formed by stamping cover body 21, abutment portion 22 is located on the side of cover body 21 facing away from second plastic part 4, and can avoid affecting the interior of the shell of the battery cell.

[0057] Furthermore, the cover plate assembly further includes a pressure ring 8 and an explosion-proof valve 9, the pressure ring 8 is connected to the hole wall of the receiving hole 212, and the explosion-proof valve 9 is located between the pressure ring 8 and the abutment portion 22. In this way, the pressure ring 8 can be fixed by cooperating with the abutment portion 22, and there is no need to weld the explosion-proof valve 9, thereby avoiding deformation and failure of the explosion-proof valve 9 due to poor welding. Preferably, the pressure ring 8 is welded to the hole wall of the receiving hole 212.

[0058] In addition, the cover plate assembly further includes a seal 62, which covers the edge of the explosion-proof valve 9 and abuts against the pressure ring 8 and the abutment portion 22. The seal 62 can have a heat insulation function, thereby reducing the heat transferred to the explosion-proof valve 9 when welding the pressure ring 8, thereby reducing the risk of deformation of the explosion-proof valve 9.

[0059] like Fig.10 As shown, the cover plate assembly further includes a second protective member 72 , which is bonded to the upper surface of the abutment portion 22 to cover the accommodating hole 212 , thereby covering the explosion-proof valve 9 located in the accommodating hole 212 .

[0060] Optionally, the second protective member 72 may be a sheet structure made of PP material, and an adhesive layer is provided on the edge of the second protective member 72 so as to bond the second protective member 72 to the upper surface of the abutting portion 22 .

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pole, characterized in that: The pole comprises a bottom plate, a pole body and a fastener, the pole body is provided with a fixing hole, the fixing hole extends in a predetermined direction, a portion of the fastener passes through the bottom plate and extends into the fixing hole, and is threadedly connected with the hole wall of the fixing hole, and another portion of the fastener can limit the position of the bottom plate in the predetermined direction; The bottom plate is used for direct welding connection with the tabs in the bare battery cell; The bottom plate comprises a first placement groove, the first placement groove is recessed from a side of the bottom plate facing away from the pole body toward the inside of the bottom plate, and the first placement groove comprises a limiting surface perpendicular to the predetermined direction; The fastener comprises a first fastening portion and a second fastening portion, the first fastening portion is located in the first placement groove and abuts against the limiting surface, and the second fastening portion passes through the bottom plate and is threadedly connected to the hole wall of the fixing hole; The bottom plate further comprises a second placement groove, the second placement groove is recessed from a side of the bottom plate facing the pole body toward the inside of the bottom plate, and the second placement groove is communicated with the first placement groove; The pole body comprises a mounting member and a protruding member, wherein the protruding member is connected to a side of the mounting member facing away from the bottom plate, the mounting member is located inside the second placement groove, and the protruding member protrudes from the bottom plate; A groove is provided on the surface of the bottom plate facing away from the pole body, and the fastener is spot-welded to the bottom plate through the groove to limit the position of the fastener; The first placement groove comprises a first placement hole, a second placement hole and a third placement hole arranged along the predetermined direction, the first placement hole is connected to the second placement groove, the diameter of the second placement hole is larger than the diameter of the first placement hole, so that the connection between the first placement hole and the second placement hole is stepped, and the limiting surface is located at the connection between the first placement hole and the second placement hole; The first fastening portion includes a first part and a second part connected to each other, the pole body is connected to the second part, the second placement hole and the third placement hole are used to accommodate the first part, the first part is in contact with the hole wall of the second placement hole, the end surface of the first part facing the second part is perpendicular to the predetermined direction, the end surface of the first part facing the second part is in contact with the limiting surface, and the second part is located in the first placement hole and is in contact with the hole wall of the first placement hole.

2. A cover plate assembly, characterized in that: The cover plate assembly comprises the pole according to claim 1.

3. The cover plate assembly according to claim 2, characterized in that: The cover plate assembly further includes a cover plate body, a first plastic part, a second plastic part and a connecting part. The pole passes through the second plastic part, the cover plate body, the first plastic part and the connecting part, and the pole is connected to the connecting part.

4. The cover plate assembly according to claim 3, characterized in that: The cover plate assembly further comprises a first protective member, which is connected to the connecting member and covers the end of the pole body facing away from the bottom plate.

5. The cover plate assembly according to claim 4, characterized in that: The connecting member includes a first connecting groove, a second connecting groove and a third connecting groove which are interconnected. The first connecting groove is located on the side of the second connecting groove which is away from the cover plate body. The pole passes through the first connecting groove and the second connecting groove. The first protective member is located in the first connecting groove and is connected to the bottom surface of the first connecting groove.

6. The cover plate assembly according to claim 3, characterized in that: The cover plate assembly further includes a pressure ring, an abutment portion and an explosion-proof valve, the cover plate body is provided with a receiving hole, the abutment portion surrounds the receiving hole, and a portion of the abutment portion protrudes relative to the middle portion of the receiving hole; The pressure ring is connected to the hole wall of the accommodating hole, and the explosion-proof valve is located between the pressure ring and the abutting portion.

7. The cover plate assembly according to claim 6, characterized in that: The cover plate assembly further comprises a sealing member, the sealing member covers the edge of the explosion-proof valve, and the sealing member abuts against the pressure ring and the abutting portion respectively.

8. The cover plate assembly according to claim 3, characterized in that: The second plastic part includes a limiting groove, which is recessed from the side of the second plastic part facing away from the cover body to the inside of the second plastic part. A first through hole penetrating the second plastic part is provided on the bottom surface of the limiting groove. Part of the bottom plate and the pole body are located in the limiting groove, and another part of the pole body passes through the first through hole, the cover body, the first plastic part and the connecting piece, and is connected to the connecting piece.

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