CN214797552U

CN214797552U - Utmost point post, apron assembly and electric core

Info

Publication number: CN214797552U
Application number: CN202121202030.2U
Authority: CN
Inventors: 于贺; 高顺航; 娄佳训
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2021-05-31
Filing date: 2021-05-31
Publication date: 2021-11-19
Anticipated expiration: 2031-05-31

Abstract

The utility model relates to a battery cell discloses a utmost point post, including utmost point post somatic part and utmost point post end cap, utmost point post end cap position is in the one end of utmost point post somatic part, and the middle part of utmost point post somatic part other end terminal surface is sunken to utmost point post end cap portion for pierce through the welding blind hole, is equipped with the connection piece weld zone with the utmost point post end cap portion that pierces through to weld the blind hole phase, and the terminal surface that pierces through the outside utmost point post somatic part that welds the blind hole is formed with busbar welding zone. Can be directly connected with the bus bar and the connecting sheet at the same time, improves the overcurrent capacity and provides a unique welding way. The utility model also provides an apron assembly, the electrode of this apron assembly include solid fixed ring, sealing washer and the utility model discloses a utmost point post, utmost point post pass electric core cover plate and solid fixed ring is connected, and the sealing washer setting is between utmost point post and electric core cover plate. Has the advantages of simple structure, small occupied space and high safety. Furthermore, the utility model also discloses an electricity core that has the utility model discloses the apron assembly.

Description

Utmost point post, apron assembly and electric core

Technical Field

The utility model relates to an electricity core specifically relates to a utmost point post. Furthermore, the utility model discloses still relate to an apron assembly and an electricity core.

Background

With the development of society and the increasing demand of people, the consumption of human energy is more and more. The traditional energy belongs to non-renewable resources, and the large consumption of the traditional energy not only leads to the gradual reduction of the reserves of the traditional energy, but also causes the discharge of a large amount of carbon, which harms the living environment of human beings and causes the gradual serious climate problem. In order to reduce carbon emission and achieve carbon balance early, nowadays, more and more automobile enterprises begin to research and manufacture electric automobiles, and as core components and energy sources of the electric automobiles, power batteries are the focus of research at present.

The storage capacity of the power battery determines the endurance mileage of the electric vehicle. A power battery typically includes a plurality of individual storage units, i.e., cells. The cell is typically made up of a cover assembly, a housing, and a pole set enclosed within the housing. The pole group is used for storing electric energy, and the cover plate assembly mainly plays a role in guiding the electric energy stored in the pole group out of the battery cell, sealing the battery cell shell, ensuring insulation between the circuit and the battery cell shell and ensuring safe output of current. Generally, positive and negative electrodes are disposed on a cover plate assembly of a battery cell, positive and negative lugs of a pole group are respectively connected with the positive and negative electrodes of the cover plate assembly, and current is output through the positive and negative electrodes of the cover plate assembly. Traditional electric core electrode is formed by utmost point post and riveting piece riveting, and the utmost point ear of utmost point group is connected to utmost point post through the connection piece on, and the electric current flows to utmost point post by utmost point post to by utmost point post flow direction riveting piece. The module busbar of power battery is in welding connection with the riveting piece of a plurality of electric cores, and the electric current that flows out by electric core electrode flows to the module busbar via the riveting piece, and power battery passes through busbar output electric energy.

The electrode of traditional apron assembly adopts utmost point post and riveting piece riveted structure, because need carry out laser welding between riveting piece and the module busbar, need carry out laser welding between utmost point post bottom and the connection piece, and laser welding needs welded position to have certain thickness, therefore, the thickness of current riveting piece and utmost point post is higher. This has caused the whole height of current apron assembly higher, and occupation space is great, influences the energy density of electric core, has increased the weight and the manufacturing cost of apron assembly. In addition, the switching between utmost point post and the riveting piece can influence the electric current bearing capacity, has increased the risk of electric connection. When the current that the electrode flows through is great, easily cause the apron high temperature, the plastic is ageing, influences the life of apron assembly. In addition, when apron assembly and connection piece carried out laser welding, welding impurity, the metal fillings etc. that the welding point department produced easily fall into utmost point group accommodation space, influence the performance of utmost point group, can cause utmost point group short circuit when serious, arouse the conflagration.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a utmost point post is provided, this utmost point post welding way is many, and the influence to the butt welding point is little.

The utility model aims to solve the technical problem still in, provide an apron assembly, the electrode current bearing capacity of this apron assembly is strong, and the security is high.

The utility model discloses the technical problem who still remains to solve provides an electricity core, and the electrode of this electricity core can reinforce, and the security is high.

In order to solve the technical problem, the utility model provides an aspect provides a utmost point post, including utmost point post somatic part and utmost point post end cap, utmost point post end cap position in the one end of utmost point post somatic part, the middle part of utmost point post somatic part other end terminal surface is sunken to utmost point post end cap portion for pierce through and weld the blind hole, with it is relative to pierce through to weld the blind hole utmost point post end cap is equipped with the connection piece weld zone, the outside of piercing through to weld the blind hole is in the terminal surface of utmost point post body is formed with the busbar weld zone.

Preferably, the pole body part is provided with a fixing ring positioning groove far away from the pole end cover part.

Further preferably, utmost point post body is cylindrically, it is setting up to pierce through the blind hole of welding utmost point post body is the circular port on the utmost point post body.

Compared with the prior art, utmost point post have following advantage:

the utility model discloses a utmost point post is provided with the penetration welding blind hole that extends to the adjacent position of connection piece weld zone in utmost point post body terminal surface middle part, welds the blind hole through should penetrating, can weld the connection piece welding of utmost point post end cap portion opposite side on the connection piece weld zone at utmost point post body, prevents that impurity, metal fillings etc. that the welding point department produced from guaranteeing the performance of utmost point group to the influence of utmost point group. Through the busbar welding zone of utmost point post portion terminal surface, can form the welded connection between utmost point post and the busbar, therefore can simplify the structure of electrode, reduce current transmission route, improve current transmission ability.

The utility model discloses the second aspect provides an apron assembly, be in including electric core cover plate and setting the electrode of electric core cover plate both sides, the electrode includes solid fixed ring, sealing washer and the utility model discloses the utmost point post that the first aspect provided, utmost point post pass the electrode mounting hole on the electric core cover plate with gu fixed ring is connected, the sealing washer sets up utmost point post with between the electrode mounting hole.

Preferably, be equipped with solid fixed ring constant head tank on the utmost point post somatic part, gu fixed ring installs gu fixed ring constant head tank department.

Preferably, the battery cell cover plate comprises an upper cover plate located on the upper layer and a lower cover plate located on the lower layer, the electrode mounting hole comprises an upper plate electrode mounting hole located on the upper cover plate and a lower plate electrode mounting hole located on the lower cover plate, and the pole penetrates through the lower plate electrode mounting hole and the upper plate electrode mounting hole to be connected with the fixing ring.

Further preferably, the sealing ring comprises an inner matching surface, a first outer matching surface and a second outer matching surface, and forms a seal with the pole body part through the inner matching surface, forms a seal with the upper plate electrode mounting hole through the first outer matching surface, and forms a seal with the lower plate electrode mounting hole through the second outer matching surface.

Preferably, the upper surface of the upper plate of the cover plate is provided with a fixing ring sinking groove at the periphery of the electrode mounting hole of the upper plate, and the fixing ring sinking groove corresponds to the fixing ring in shape.

Preferably, the fixing ring is molded from an insulating material.

Compared with the prior art, the cover plate assembly has the following advantages:

the utility model discloses an apron assembly has used the utility model discloses the utmost point post that the first aspect provided, therefore have the utility model discloses a technical advantage of utmost point post. Additionally, the utility model discloses an in the apron assembly, utmost point post passes electric core cover plate and is connected with solid fixed ring, has formed the electrode of fixing on electric core cover plate, running through electric core cover plate, has left out the riveting piece among the traditional electrode structure, has reduced the transmission link of electric current, has reduced connection structure to the influence of electric current transmission ability to, avoided the riveting piece to drop the risk that causes the incident. The utility model discloses an apron assembly can be with module busbar lug weld on utmost point post, has reduced the thickness of traditional apron assembly, and the space that has reduced the apron assembly occupies, has increased the space of arranging of utmost point group in the electric core to can improve the energy density of electric core.

The utility model discloses the third aspect provides an electric core, include the utility model discloses the apron assembly that the second aspect provided.

The utility model discloses an electricity core, owing to adopted the utility model discloses an apron assembly, therefore for prior art the advantage that has with the utility model discloses an apron assembly is the same, no longer gives unnecessary details here.

Other technical features and advantages of the present invention will be further described in the following detailed description.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of a pole of the present invention;

fig. 2 is a schematic cross-sectional view of an embodiment of a pole of the present invention;

FIG. 3 is a schematic view of an embodiment of the cover plate assembly of the present invention in an installed state;

FIG. 4 is an exploded view of one embodiment of the cover plate assembly of the present invention;

FIG. 5 is a top view of one embodiment of the cover plate assembly of the present invention;

FIG. 6 is a sectional view taken along line A-A of FIG. 5;

FIG. 7 is a partial enlarged view of portion B of FIG. 6;

fig. 8 is a schematic view of a seal ring in an embodiment of the cover plate assembly of the present invention.

Description of the reference numerals

1 pole 11 pole body

12 utmost point post end cover portion 13 connection piece welded area

14 penetration weld blind hole 15 bus weld zone

16 fixed ring fixed slot 2 fixed ring

3 inside matching surface of sealing ring 31

32 first outside mating surface 33 second outside mating surface

4 electric core cover plate 41 cover plate upper plate

411 upper plate electrode mounting hole 412 fixing ring sink

42 lower plate 421 lower plate electrode mounting hole of cover plate

5 explosion-proof valve 6 liquid filling hole

Detailed Description

In the present invention, the embodiments and the features of the embodiments may be combined with each other without conflict.

In the present invention, in the case where no explanation is made to the contrary, the position or positional relationship indicated by the used position words such as "up and down" is based on the position or positional relationship when the cover plate assembly is mounted on the electric core for normal use. It is right the utility model discloses a direction or the description of position relation of apron assembly and utmost point post and spare part are unanimous with the installation position in its in-service use.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either directly or indirectly through intervening media, either internally or in any combination thereof. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present invention, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, and therefore the features defined "first", "second" may explicitly or implicitly include one or more of the features described.

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, and it should be understood that the embodiments described herein are merely for purposes of illustration and explanation, and the scope of the present invention is not limited to the following embodiments.

As shown in fig. 1 and 2, an embodiment of a pole of the present invention includes a pole body 11 and a pole end cap 12. When the pole fixing cover plate is used, the pole body 11 can penetrate through the cover plate and is connected with the connecting structure on the other surface of the cover plate, and a pole is fixed on the cover plate. The pole body 11 is generally made of a conductive material having good electrical conductivity. The structure is generally made into a columnar structure, and specifically, the structure can be made into a cylindrical shape, an elliptic cylindrical shape, a square cylindrical shape or a prismatic shape, and can also be made into other acceptable shapes. The pole end cover part 12 is connected to one side end face of the pole body part 11, and the pole end cover part 12 is also made of a conductive material with good conductivity. The post body 11 and the post end cap 12 may be made of the same conductive material or different conductive materials. Generally, the terminal used for the cell negative electrode, the terminal body portion 11 and the terminal end cap portion 12 are made of different conductive materials. The edge of the pole end cover part 12 protrudes to the outer side of the pole body part 11 to form a mounting structure for positioning and fixing the pole. The post end cap portion 12 may be formed in a circular, square, or polygonal shape, or may be formed in various other suitable shapes. The pole body part 11 and the pole end cover part 12 can be integrally connected, such as turning and over-molding by using the same raw material, or processing and molding by using other modes such as forging and casting. They may also be connected to each other by at least one of welding, riveting, or other possible connection means. A connecting sheet welding area 13 for welding connection with the connecting sheet is arranged on one surface of the pole end cover part 12 opposite to the pole body part 11, and a penetration welding blind hole 14 is arranged in the middle of one end surface of the pole body part 11 opposite to the connecting sheet welding area 13. The penetration welding blind hole 14 extends towards the connecting sheet welding area 13, so that the thickness of the pole end cover part 12 between the bottom of the penetration welding blind hole 14 and the connecting sheet welding area 13 is in a proper range, laser welding can be carried out on the bottom of the penetration welding blind hole 14, the connecting sheet arranged at the connecting sheet welding area 13 is welded on the connecting sheet welding area 13, and welding connection between the connecting sheet and the connecting sheet welding area 13 is formed. Therefore, the connecting structure on the other side of the pole can be welded on one side of the pole, and welding ways are enriched. The 11 terminal surfaces of utmost point post somatic part in the penetrating welding blind hole 14 opening outside can be used for as carrying out welded connection's region with the module busbar, forms busbar welding zone 15, makes the utility model discloses an utmost point post not only can be used for carrying out the inside and outside current transmission of electric core, can also form the lug connection of circuit between electric core and the busbar through this utmost point post, has richened the function of utmost point post.

In some embodiments of the pole of the present invention, as shown in fig. 1 and 2, a fixing ring positioning groove 16 is provided on the upper portion of the pole body 11, away from the outer side surface of the pole end cover 12. The fixing ring positioning groove 16 may be a circle of rectangular groove, trapezoidal groove or triangular groove formed on the outer periphery of the upper portion of the pole body portion 11. The arrangement of the fixed ring positioning groove 16 can be used for positioning an external connection structure, and is also beneficial to the diffusion of materials on the upper part of the pole body part 11, so that the end part of the pole body part 11 is conveniently riveted.

As a specific embodiment of the pole of the present invention, as shown in fig. 1 and fig. 2, the pole body 11 is processed into a cylindrical shape, the processing of the cylindrical pole body 11 is more convenient, and the occupied space is smaller relative to other shapes under the same condition of the flow area. The post body 11 is connected to the middle region of the post end cover portion 12, and the connecting-piece welding area 13 is provided in the middle region of the post end cover portion 12 on the side opposite to the post body 11, and accordingly, the penetration welding blind hole 14 is also a circular blind hole extending toward the connecting-piece welding area 13 and provided in the center region of the end surface of the post body 11. The aperture of the through-solder via 14 is limited to facilitate laser through-soldering of the bottom of the through-solder via 14 by the through-solder via 14. The connecting sheet welding area 13 is arranged in the middle area of the pole end cover part 12, so that a high-temperature area formed by heat generated by welding can be concentrated in the middle area of the pole end cover part 12 during laser welding, and the influence of the high temperature generated by welding on the peripheral plastic part structure can be reduced.

As shown in fig. 3 to 8, the present invention discloses an embodiment of a cover plate assembly, which comprises a cell cover plate 4, wherein positive and negative electrodes are disposed on two sides of the cell cover plate 4, an explosion-proof valve 5 is disposed in the middle of the cell cover plate 4, and a liquid injection hole 6 is disposed between the explosion-proof valve 5 and one side electrode. The positive negative electrode all includes solid fixed ring 2, sealing washer 3 and the utility model discloses the utmost point post 1 of arbitrary embodiment. The pole 1 penetrates through the cell cover plate 4 from bottom to top, the pole end cover part 12 is located below the cell cover plate 4, and the upper part of the pole body part 11 penetrates through the cell cover plate 4 to be connected with the fixing ring 2, so that the pole end cover part 12 and the fixing ring 2 clamp the cell cover plate 4 tightly and fix the pole 1 on the cell cover plate 4. Usually, electrode mounting holes are formed in two sides of the cell cover plate 4, and the upper portion of the post body 11 passes through the electrode mounting holes to reach the upper portion of the cell cover plate 4 and is riveted to the fixing ring 2. Through piercing through and welding blind hole 14, can be in the top of electric core apron 4 to the connection piece welding of electric core apron 4 below on connection piece weld zone 13, form utmost point post 1 and connection piece to and the electric connection between the electric core utmost point group that is connected with the connection piece, when avoiding welding in the below of electric core apron 4, impurity, the metal fillings that the welding produced get into between the utmost point group in the electric core, and the short circuit that consequently causes, risk such as being on fire. The yield of the battery cell is improved, and the safety of the battery cell is ensured. The busbar welding zone 15 of 11 tip of utmost point post somatic part can be used for with utmost point post 1 beading on the module busbar, has left out the riveting block structure of traditional electric core electrode, has just also reduced utmost point post 1 and the laser welding between the riveting piece, has reduced process flow, has reduced electric core apron cost. Meanwhile, the path of current on the cover plate is simplified, the current does not pass through the laser welding position between the pole 1 and the riveting block when flowing through, the risk of overcurrent failure of the cover plate assembly is reduced, and the overcurrent stability of the cover plate assembly is improved. And the current does not need to pass through the riveting block, so that the path through which the current flows is reduced, and the obvious effects of reducing the internal resistance of the cover plate assembly and increasing the overcurrent capacity of the cover plate assembly are achieved. In addition, compare with traditional apron assembly, the utility model discloses an apron assembly can stop the risk that the riveting piece drops with module busbar lug weld on utmost point post 1, has further promoted power battery's security. Sealing washer 3 sets up between utmost point post 1 and electric core cover plate 4, forms the sealed between utmost point post 1 and the electric core cover plate 4, when stabilizing 1 installation location of utmost point post, prevents seeing through of electrolyte to and the influence of electrolyte to circuit and circuit connection structure.

As a specific embodiment of the utility model discloses a cover plate assembly, as shown in fig. 4 to fig. 7, upper portion position at utmost point post somatic part 11 lateral surface is equipped with solid fixed ring constant head tank 16, when utmost point post 1 passes electrode mounting hole installation electric core cover plate 4 on, gu fixed ring constant head tank 16 can be located electric core cover plate 4's upper surface department just, gu fixed ring 2 installs solid fixed ring constant head tank 16 department on utmost point post somatic part 11, the up end of riveting utmost point post somatic part 11, with solid fixed ring 2 riveting on utmost point post 1, and make solid fixed ring 2 and utmost point post end cover portion 12 tightly press from both sides tight electric core cover plate 4 from electric core cover plate 4's two sides, form an electrode of fixing on electric core cover plate 4.

In some embodiments of the cover plate assembly of the present invention, as shown in fig. 4 to 7, the cell cover plate 4 includes a cover plate upper plate 41 located at an upper layer and a cover plate lower plate 42 located at a lower layer. Upper plate electrode mounting holes 411 are provided on both sides of the upper plate 41 of the cover, and lower plate electrode mounting holes 421 are provided on both sides of the lower plate 42 of the cover at positions opposite to the upper plate electrode mounting holes 411. The aperture of the upper-board electrode mounting hole 411 and the aperture of the lower-board electrode mounting hole 421 may be the same or different, and usually the aperture of the lower-board electrode mounting hole 421 is slightly larger than the aperture of the upper-board electrode mounting hole 411. When the cover plate upper plate 41 and the cover plate lower plate 42 are combined to form the cell cover 4, the upper plate electrode mounting hole 411 and the lower plate electrode mounting hole 421 on the same side are in opposite positions and are communicated with each other, so that an electrode mounting hole is formed by combination. The pole 1 successively passes through the lower plate electrode mounting hole 421 and the upper plate electrode mounting hole 411 to be riveted with the fixing ring 2, so that the fixed connection among the pole 1, the cover plate upper plate 41, the cover plate lower plate 42 and the fixing ring 2 is formed.

As a specific embodiment of the cover plate assembly of the present invention, as shown in fig. 6 to 8, the seal ring 3 is an annular seal ring having an L-shaped cross section. The inner side of the sealing ring 3 has an inner mating surface 31 and the outer side of the sealing ring 3 has a first outer mating surface 32 and a second outer mating surface 33, the second outer mating surface 33 typically having a larger diameter than the first outer mating surface 32. When the sealing ring 3 is installed between the pole 1 and the cell cover plate 4, the inner matching surface 31 is close to the outer side surface of the pole body part 11 to form sealing between the sealing ring 3 and the pole body part 11; the first outer fitting surface 32 is close to the inner side of the upper plate electrode mounting hole 411 to form a seal between the gasket 3 and the cover plate upper plate 41, and the second outer fitting surface 33 is close to the inner side of the lower plate electrode mounting hole 421 to form a seal between the gasket 3 and the cover plate lower plate 42. In this way, a reliable seal between the terminal 1 and the cell cover plate 4 can be formed.

In some embodiments of the cover assembly of the present invention, as shown in fig. 4 to 7, a fixing ring sinking groove 412 is provided on the upper surface of the upper plate 41 around the periphery of the electrode mounting hole 411 of the upper plate. The shape and size of the fixed ring sink groove 412 are equivalent to the shape and size of the fixed ring 2, when the fixed ring 2 is fixed on the pole 1, at least one part of the lower part of the fixed ring 2 is positioned in the fixed ring sink groove 412, on one hand, the accurate positioning of the fixed ring 2 on the cover plate 41 is formed, on the other hand, the thickness of the electrode part of the cover plate assembly is further reduced, and the space occupation of the cover plate assembly is reduced.

In some embodiments of the cover plate assembly of the present invention, the fixing ring 2 is made of an insulating material. Generally, the fixing ring 2 may be injection molded using PP, PPs, or the like. The shape of the fixing ring 2 can also be made into various shapes such as circle, square, polygon and the like. The fixing ring 2 and the pole body 11 can be connected with each other by hot riveting, clamping, gluing or a combination of the above modes. The upper plate 41 of the cover plate can be made of conductive materials such as aluminum plates, at the moment, the insulating between the pole 1 and the upper plate 41 of the cover plate can be conveniently ensured by the fixing ring 2 made of insulating materials, and the insulating part is prevented from being arranged between the fixing ring 2 and the upper plate 41 of the cover plate.

The utility model discloses an electricity core has adopted the utility model discloses an apron assembly of any kind of embodiment, the ability of overflowing of electricity core electrode is stronger, and it is bigger that utmost point group sets up the space, and the security is also higher.

Reference throughout this specification to "one embodiment," "some embodiments," or similar language means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. In this specification, the schematic representations thereof do not necessarily have to be directed to the same embodiment.

The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited thereto. In the technical idea scope of the present invention, it is possible to provide the technical solution of the present invention with a plurality of simple modifications, including combining each specific technical feature in any suitable manner, and in order to avoid unnecessary repetition, the present invention does not provide additional description for various possible combinations. These simple variations and combinations should also be considered as disclosed in the present invention, all falling within the scope of protection of the present invention.

Claims

1. The utility model provides a pole, its characterized in that, includes utmost point post somatic part (11) and utmost point post end cover portion (12), utmost point post end cover portion (12) are located the one end of utmost point post somatic part (11), the middle part of utmost point post somatic part (11) other end terminal surface to utmost point post end cover portion (12) are sunken for piercing through welding blind hole (14), with it is relative to pierce through welding blind hole (14) utmost point post end cover portion (12) are equipped with connection pad district (13), pierce through the outside of welding blind hole (14) the terminal surface of utmost point post somatic part (11) is formed with busbar welding district (15).

2. Pole according to claim 1, characterized in that the pole body (11) is provided with a fixing ring positioning slot (16) remote from the pole end cover (12).

3. The pole according to claim 2, characterized in that said pole body (11) is cylindrical and said blind through-weld hole (14) is a circular hole provided on said pole body (11).

4. A cover plate assembly, comprising a cell cover plate (4) and electrodes disposed on both sides of the cell cover plate (4), wherein the electrodes comprise a fixing ring (2), a sealing ring (3) and the terminal post (1) according to any one of claims 1 to 3, the terminal post (1) penetrates through the cell cover plate (4) to be connected with the fixing ring (2), and the sealing ring (3) is disposed between the terminal post (1) and the cell cover plate (4).

5. The cover plate assembly according to claim 4, characterized in that the pole body (11) is provided with a fixing ring positioning slot (16), the fixing ring (2) being mounted at the fixing ring positioning slot (16).

6. The cover plate assembly of claim 4, wherein the cell cover plate (4) comprises a cover plate upper plate (41) at an upper layer and a cover plate lower plate (42) at a lower layer, wherein upper plate electrode mounting holes (411) are formed in two sides of the cover plate upper plate (41), lower plate electrode mounting holes (421) are formed in opposite positions on the cover plate lower plate (42), and the terminal post (1) penetrates through the lower plate electrode mounting holes (421) and the upper plate electrode mounting holes (411) to be connected with the fixing ring (2).

7. The cover plate assembly according to claim 6, wherein the sealing ring (3) includes an inner mating surface (31), a first outer mating surface (32), and a second outer mating surface (33), and forms a seal with the post body (11) through the inner mating surface (31), forms a seal with the upper plate electrode mounting hole (411) through the first outer mating surface (32), and forms a seal with the lower plate electrode mounting hole (421) through the second outer mating surface (33).

8. The cap assembly according to claim 6, wherein the upper surface of the cap upper plate (41) is provided with a fixing ring sinking groove (412) at the periphery of the upper plate electrode mounting hole (411), and the fixing ring sinking groove (412) corresponds to the shape of the fixing ring (2).

9. The cover plate assembly according to claim 4, characterized in that the fixing ring (2) is molded from an insulating material.

10. A battery cell comprising a cover plate assembly according to any of claims 4-9.