CN214706069U

CN214706069U - Electric core cover plate and electric core

Info

Publication number: CN214706069U
Application number: CN202120666871.2U
Authority: CN
Inventors: 宁亚军; 夏天军; 于东朋; 姬嘉帅
Original assignee: Svolt Energy Technology Wuxi Co Ltd
Current assignee: Svolt Energy Technology Wuxi Co Ltd
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2021-11-12
Anticipated expiration: 2031-03-31

Abstract

The utility model relates to an apron provides an electricity core apron and electric core. The utility model discloses an electric core apron, including base plate (1) and battery connection piece (2), base plate (1) with connect through fastener (3) between battery connection piece (2), fastener (3) have electric conductivity, base plate (1) with between fastener (3) and between base plate (1) and the battery connection piece (2) insulating seal connects, battery connection piece (2) have welding plane (21) and bellied additional strengthening (22), the ratio of the thickness of additional strengthening (22) with the thickness of welding plane (21) is 2:1-4: 1. Electric core, be provided with foretell electric core apron, electric core utmost point group and casing. The utility model provides an electricity core apron can also increase the intensity of battery connection piece when guaranteeing battery connection piece and electric core utmost point group welded yield.

Description

Electric core cover plate and electric core

Technical Field

The utility model relates to an apron, in particular to electricity core apron. The utility model discloses still relate to the electric core including this electricity core apron.

Background

With the increasing maturity of lithium ion battery technology, lithium ion batteries are widely used in the field of electric vehicles as power batteries. In order to be able to take a better position in the competition of the market, the performance requirements of the cell are higher and higher nowadays.

The battery connecting sheet is used for transmitting electric energy in the battery cell pole group to an external transmission medium, and can ensure the sealing of the battery cell together with the shell, thereby ensuring the normal use of the battery cell. However, when the cell cover plate is used, the substrate and the battery connecting piece need to be connected and fixed through the fastener, and during the connection process of the fastener and the battery connecting piece, the battery connecting piece can be deformed due to local overlarge stress, so that the performance of the whole battery is affected. The thickness of the whole battery connecting sheet is increased, so that the possibility of deformation of the battery connecting sheet can be effectively reduced, but the difficulty of welding the battery connecting sheet with the pole group is increased, and the transmission efficiency of electric energy is influenced.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing an electric core cover plate can also increase the intensity of battery connection piece when guaranteeing battery connection piece and electric core utmost point group welded yield.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a battery core cover plate comprises a base plate and a battery connecting piece, wherein the base plate is connected with the battery connecting piece through a fastening piece, the fastening piece is conductive, the base plate is connected with the fastening piece and the base plate is connected with the battery connecting piece in an insulation and sealing mode, the battery connecting piece is provided with a welding plane and a protruding reinforcing structure, and the ratio of the thickness of the reinforcing structure to the thickness of the welding plane is 2:1-4: 1.

Further, the reinforcing structure includes at least one reinforcing rib, and the at least one reinforcing rib is provided to extend from the center of the battery connecting sheet to the outside.

Furthermore, the reinforcing structure also comprises a reinforcing protrusion formed in the center of the battery connecting sheet, and one end of the reinforcing rib is connected with the reinforcing protrusion.

Furthermore, the welding plane is also provided with a liquid leakage hole.

Furthermore, the liquid leakage holes are positioned on one side or two sides of the reinforcing rib and are spaced from the reinforcing rib.

Furthermore, the liquid leakage holes are long strip-shaped through holes extending along the length direction of the reinforcing ribs corresponding to the liquid leakage holes.

Furthermore, an insulating film is arranged between the substrate and the battery connecting sheet, one side face of the insulating film is in contact with the reinforcing structure, and the outer edge of the insulating film extends to the outer side of the outer edge of the battery connecting sheet.

Further, a sealing ring and an insulating ring are arranged between the fastening piece and the substrate, the inner side of the sealing ring is attached to the fastening piece, the outer side of the sealing ring is attached to the substrate, and the insulating ring is arranged on the periphery of the sealing ring.

Furthermore, the base plate is provided with a base plate bulge for preventing the insulating ring from moving, and an insulating ring covering edge capable of covering the top cover of the fastener is formed on the insulating ring.

Further, an insulating sheet is disposed between the insulating film and the substrate.

Compared with the prior art, electric core cover plate have following advantage:

electric core apron, through set up additional strengthening on the battery connection piece to set up additional strengthening's thickness for being greater than welding planar thickness, can effectively increase the structural strength of battery connection piece, also can not influence welding plane welding effect simultaneously, improve the welding yield of battery connection piece and electric core utmost point group, guarantee the electrical property of electric core.

Another object of the present invention is to provide an electrical core, which can ensure the yield of the welding between the battery connecting sheet and the electrical core electrode assembly, and can also increase the strength of the battery connecting sheet.

the utility model provides an electric core, is provided with electric core utmost point group, is used for the parcel electric core utmost point group's casing and above-mentioned electric core apron, electric core apron with casing sealing connection, the battery connection piece with electric core utmost point group link, and all set up in the casing.

The advantages of the battery cell and the battery cell cover plate are the same compared with the prior art, and are not described herein again.

Other features and advantages of the present invention will be described in detail in the detailed description which follows.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is an exploded schematic view of a structure of a cell cover plate according to an embodiment of the present invention;

fig. 2 is a top view of a cell cover plate according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic structural view of a battery connecting sheet according to an embodiment of the present invention;

FIG. 5 is a top view of a battery tab according to an embodiment of the present invention;

FIG. 6 is a schematic sectional view taken along the line B-B in FIG. 5;

fig. 7 is one of schematic installation diagrams of a battery cell according to an embodiment of the present invention;

fig. 8 is a second schematic view illustrating the installation of the battery cell according to an embodiment of the present invention;

fig. 9 is a top view of a battery cell according to another embodiment of the present invention;

FIG. 10 is a schematic cross-sectional view taken along plane C-C of FIG. 9;

fig. 11 is an enlarged schematic view of a portion D in fig. 10.

Description of reference numerals:

1 base plate 2 battery connecting sheet

3 fastener 4 insulating film

5 sealing ring 6 insulating ring

7 insulating piece 8 electric core pole group

9 casing

11 substrate projection 21 bonding plane

22 reinforcing structure 23 weep hole

91 shell opening of 61 insulation ring edge covering

221 reinforcing rib 222 reinforcing projection

Detailed Description

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

In addition, the terms "inside", "outside", "top", "bottom", and the like referred to in the embodiments of the present invention indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, the battery-based case 9, "top" refers to the top of the case 9, and correspondingly, "bottom" refers to the bottom of the case 9, "inside" refers to the inside of the case 9, and "outside" refers to the outside of the case 9. The terminology is based on the orientations and positional relationships illustrated in the drawings and is not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and is not to be construed as limiting the invention.

It is to be understood that, unless expressly stated or limited otherwise, the terms "connected," "mounted," and "contacting" are intended to be open-ended, i.e., connected as either a fixed or removable connection or an integral connection; the components may be directly connected or indirectly connected through an intermediate medium, or the components may be connected through an intermediate medium or the components may be in an interactive relationship with each other. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The present invention will be described in detail with reference to the accompanying drawings in conjunction with embodiments.

The basic embodiment of the utility model provides a battery core cover plate, as shown in fig. 1 and fig. 2, including base plate 1 and battery connection piece 2, connect through fastener 3 between base plate 1 and the battery connection piece 2, fastener 3 has electric conductivity, and insulating seal connects between base plate 1 and the fastener 3 and between base plate 1 and the battery connection piece 2, and battery connection piece 2 has welding plane 21 and bellied additional strengthening 22, and the ratio of the thickness of additional strengthening 22 and the thickness of welding plane 21 is 2:1-4: 1.

In the present invention, the battery connecting piece 2 has conductivity, and the substrate 1 may or may not have conductivity. The substrate 1 may be a conventional electrical substrate in the art, such as a steel plate or other relatively rigid plate. The fastening member 3 may be a conductive member capable of connecting the base plate 1 and the cell connecting plate 2, which is generally known in the art, and may be a bolt or a screw, which is generally known, or other fastening members. Insulating sealant can be arranged between the base plate 1 and the fastener 3 and between the fastener 3 and the battery connecting sheet 2, and an insulating layer and a sealing layer can also be respectively arranged, and the insulating layer and the sealing layer can be integrally arranged or separately arranged. The insulating layer, the sealing layer and the insulating sealant can be made of materials capable of realizing insulating sealing effect in the prior art, such as rubber materials without conductivity in the prior art.

The base plate 1 and the battery connecting piece 2 are each provided with a fixing hole into which the fastener 3 is inserted. The fastener 3 may be directly fixed to the base plate 1 and the battery connecting piece 2, or may be fixed by welding.

The utility model discloses in, battery connection piece 2 can set up according to the shape of electric core utmost point group 8, specifically, battery connection piece 2 matches with electric core utmost point group 8. When applied to the prismatic battery cell pole group 8, the battery connecting piece 2 is set in a shape conforming to the bottom surface of the prismatic battery cell pole group 8; when applied to a cylindrical cell pole group 8, the battery connecting plate 2 is provided in a circular shape.

When the cell cover plate provided by the basic embodiment is used, referring to fig. 10 and 11, the welding plane 21 is matched with the flat surface of the cell pole group 8, and the two are connected together by laser welding, and the convex reinforcing structure 22 protrudes to the side away from the cell pole group 8, that is, the convex reinforcing structure 22 protrudes to the base plate 1.

The above-mentioned electric core apron that basic embodiment provided is through setting up additional strengthening 22 on the battery connection piece to set up additional strengthening 22's thickness to be greater than the thickness of welding plane 21, can effectively increase the structural strength of battery connection piece 2, also can not influence welding plane 21 welding effect simultaneously, improve the welding yield of battery connection piece 2 and electric core utmost point group 8, guarantee the electricity performance of electric core. By connecting the substrate 1 and the battery connecting sheet 2 through the fastening member 3 having conductivity and connecting the substrate 1 and the battery connecting sheet 2 and the substrate 1 and the fastening member 3 in an insulating manner, electric energy can be transmitted to the substrate 1 through the battery connecting sheet 1 and transmitted to the outside through the substrate 1, and the transmission efficiency of the electric energy is improved.

The reinforcing structure 22 may be any structure capable of reinforcing the cell connecting plate 2 in the prior art, such as a raised structure distributed on the cell connecting plate 2 or a reinforcing layer provided on the cell connecting plate 2. In one embodiment of the present invention, as shown in fig. 4 to 6, the reinforcing structure 22 includes at least one reinforcing rib 221, and the at least one reinforcing rib 221 is provided to extend outward from the center of the battery connecting piece 2. Wherein the center of the battery connecting piece 2 is a geometric center. The fastener 3 is generally connected with the center of the battery connecting sheet 2, and the reinforcing ribs 221 are arranged to extend outwards from the center of the battery connecting sheet 2, so that the structural strength of the connecting part of the battery connecting sheet 2 and the fastener 3 can be effectively improved, and the possibility of deformation of the battery connecting sheet 2 is further reduced.

Preferably, the ribs 221 are provided in plurality and uniformly distributed on the connecting piece main body 1, so as to improve the overall structural strength of the battery connecting piece 2, thereby enabling the battery connecting piece 2 to be designed in a larger size.

When battery connection piece 2 sets up to circular, and strengthening rib 221 is provided with when a plurality ofly, a plurality of strengthening ribs all extend to the outside from the center of battery connection piece 2 along the radial direction of battery connection piece 2, and evenly distributed to make the whole surface of battery connection piece 2 can carry out intensity increase effect through strengthening rib 221 to a certain extent. Specifically, the reinforcing ribs 221 are provided in 3 number, and the three reinforcing ribs 221 can form a "Y" shaped structure or a similar "Y" shaped structure on the cell connection piece 2.

In order to further enhance the structural strength of the connecting plate main body 1, in one embodiment of the present invention, referring to fig. 4-6, the reinforcing structure 22 further includes a reinforcing protrusion 222 formed at the center of the battery connecting plate 2, and one end of the reinforcing rib 221 is connected to the reinforcing protrusion 222. At least one reinforcing rib 221 is connected through the reinforcing protrusions 222, so that the connection among the plurality of reinforcing ribs 221 is firmer, the structural strength of the battery connecting piece 2 can be effectively improved, and the structural strength of the joint of the battery connecting piece 2 and the fastener 3 can be further improved.

In order to facilitate the injection of the electrolyte into the battery cell, in a specific embodiment of the present invention, as shown in fig. 4 and 5, a leakage hole 23 is further disposed on the welding plane 21.

The utility model discloses in, do not do strict demand to the form of weeping hole 23 on the welding plane 21, in order to satisfy electric automobile platform ization demand, the battery size needs to be to thicker, longer direction development, for this reason, the size of battery connection piece also need carry out corresponding increase according to the battery size, the area that can open weeping hole 23 also increases thereupon, in concrete application, the shape of weeping hole 23, the size can be based on the overall dimension of battery connection piece 2 satisfying rigidity, under the prerequisite of intensity, carry out reasonable design. Preferably, the weep holes 23 are located on one or both sides of the rib 221 with a space therebetween from the rib 221. More preferably, as shown in fig. 4 and 5, the weep holes 23 are located on both sides of the rib 221 with a space therebetween. The size of the interval may be determined by those skilled in the art as the case may be.

As an embodiment of the present invention, as shown in fig. 4 and 5, the leakage hole 23 is a long-strip-shaped through hole extending along the length direction of the reinforcing rib 221 corresponding to the leakage hole 23, so as to better promote the penetration of the electrolyte and improve the working efficiency of the battery cell electrode group 8.

In one embodiment of the present invention, referring to fig. 1 to 3, an insulating film 4 is provided between the substrate 1 and the battery connecting sheet 2, one side surface of the insulating film 4 is in contact with the reinforcing structure 22, and the outer edge of the insulating film 4 extends to the outside of the outer edge of the battery connecting sheet 2. The insulating connection of the cell connection tab 2 to the substrate can be achieved by arranging the insulating film 4 between the cell connection tab 2 and the substrate 1; set up the outer border of insulating film 4 into the outside that can extend to 2 outer borders of battery connection piece, can wrap up electric core utmost point group 8 through the insulating film that is located 2 outer borders of battery connection piece outside to can effectively reduce the use of rubberizing in the electric core utmost point group 8, also can reduce the cost of manufacture when simplifying the preparation step, also can guarantee the electrical property of electric core moreover.

In order to achieve a better wrapping effect of the insulating film 4 on the cell electrode group 8 at a low cost, in a specific embodiment of the present invention, the battery connecting sheet 2 and the insulating film 4 are both configured to be circular, and the diameter ratio of the insulating film 4 to the battery connecting sheet 2 is (1.5-2): 1.

When the cell cover plate provided by the above-mentioned specific embodiment is used, when the cell electrode group 8 and the battery connecting piece 2 are welded, the insulating film 4 needs to be folded along the periphery of the substrate 1, and then the battery connecting piece 2 and the cell electrode group 8 are welded by welding the welding plane 21, as shown in fig. 7. After the soldering is completed, the insulating film 4 is continued to be laid flat, see fig. 8.

In order to achieve better insulation sealing effect, the utility model discloses an embodiment, refer to fig. 2 and fig. 3, be provided with sealing washer 5 and insulating ring 6 between fastener 3 and the base plate 1, the inboard and the laminating of fastener 3 of sealing washer 5, the outside is laminated with base plate 1, insulating ring 6 sets up in the periphery of sealing washer 5. Set up sealing washer 5 in the junction of fastener 3 and base plate 1 to set up the inboard of sealing washer 5 and laminate with fastener 3, the outside sets up to laminate with base plate 1, can improve the sealed effect between base plate 1 and the fastener 3. Moreover, the sealing ring 5 can also achieve a good electric insulation effect, the insulating ring 6 is arranged on the periphery of the sealing ring 5, and the top cover of the fastening piece 3 can be prevented from contacting with the substrate 1 in the use or transportation process, so that a better electric insulation effect can be achieved between the substrate 1 and the fastening piece 3.

Specifically, referring to fig. 2 and 3, the seal ring 5 includes a first sealing portion and a second sealing portion disposed up and down, an inner edge of the first sealing portion and an inner edge of the second sealing portion are located on the same curved surface, and an outer edge of the first sealing portion is disposed outside an outer edge of the second sealing portion. In the use, the inboard of first sealing and the inboard of second sealing all laminate with fastener 3, and the upper surface of first sealing laminates with the lower surface of fastener 3 top cap, and the lower surface of first sealing laminates with the upper surface of base plate 1, and the outside surface of second sealing laminates with the inner circle of base plate 1. The provision of the sealing ring 5 described above enables a better sealing effect between the fastening member 3 and the base plate 1.

In one embodiment of the present invention, as shown in fig. 1, 2 and 3, a substrate protrusion 11 for preventing the insulating ring 6 from moving is provided on the substrate 1. Through the setting of base plate arch 11, can extrude insulating ring 6 between base plate 1 and sealing washer 5, prevent that insulating ring 6 from removing between base plate 1 and fastener 3, further guarantee the insulating effect between fastener 3 and the base plate 1.

In order to achieve a better fixing effect, in an embodiment of the present invention, as shown in fig. 1, fig. 2 and fig. 3, an insulating ring edge 61 capable of wrapping the top cover of the fastening member 3 is formed on the insulating ring 6. Bordure 61 through insulating circle and live the top cap parcel of fastener 3, can play better location effect to fastener 3, prevent the removal of fastener 3 in base plate 1 place plane to reach better fixed effect.

In order to reduce the abrasion of the insulating film 4 by the substrate 1 and also to achieve the electrical insulation effect between the substrate 1 and the fastening member 3, in an embodiment of the present invention, as shown in fig. 2 and 3, an insulating sheet 7 is disposed between the insulating film 4 and the substrate 1. The insulating sheet 7 can prevent the substrate 1 from wearing the insulating film 4, and can also achieve an electrical insulating effect.

The utility model discloses in, insulating piece 7, insulating ring 6, sealing washer 5 all adopt insulating piece 7, insulating ring 6, sealing washer 5 among the prior art.

In a relatively preferred embodiment of the present invention, referring to fig. 1 to 6, a cell cover plate is provided, which includes a substrate 1 and a battery connecting sheet 2, the substrate 1 and the battery connecting sheet 2 are connected by a fastener 3, the fastener 3 is a rivet with conductivity, and the substrate 1 is a steel plate; a sealing ring 5 and an insulating ring 6 are arranged between the fastener 3 and the substrate 1, the insulating ring 6 is arranged on the periphery of the sealing ring 5, the sealing ring 5 comprises a first sealing part and a second sealing part which are arranged up and down, the inner edge of the first sealing part and the inner edge of the second sealing part are positioned in the same curved surface, the outer edge of the first sealing part is arranged on the outer side of the outer edge of the second sealing part, the inner side of the first sealing part and the inner side of the second sealing part are both attached to the fastener 3, the upper surface of the first sealing part is attached to the lower surface of a top cover of the fastener 3, the lower surface of the first sealing part is attached to the upper surface of the substrate 1, and the outer surface of the second sealing part is attached to the inner ring of the substrate 1; a substrate bulge 11 for preventing the insulating ring 6 from moving is arranged on the substrate 1, and an insulating ring edge 61 capable of wrapping a top cover of a rivet is formed on the insulating ring 6; an insulating film 4 for electrically insulating the substrate 1 and the battery connecting sheet 2 is arranged between the substrate 1 and the battery connecting sheet 2, an insulating sheet 7 is arranged between the insulating film 4 and the substrate 1, the battery connecting sheet 2 and the insulating film 4 are both circular, and the diameter ratio of the insulating film 4 to the battery connecting sheet 2 is (1.5-2): 1; the battery connecting sheet 2 is provided with a welding plane 21 and a raised reinforcing structure 22, and the ratio of the thickness of the reinforcing structure 22 to the thickness of the welding plane 21 is 2:1-4: 1; the reinforcing structure 22 includes at least one reinforcing rib 221 and a reinforcing protrusion 222 formed at a central position of the battery tab 2, the reinforcing rib 221 is connected to the reinforcing protrusion 222, and the reinforcing rib 221 is provided to extend in a radial direction of the battery tab 2; the welding plane 21 is further provided with liquid leaking holes 23, the liquid leaking holes 23 are located on one side or two sides of the reinforcing rib 221, and have a gap with the reinforcing rib 221, and the liquid leaking holes 23 are long strip-shaped through holes extending along the length direction of the reinforcing rib 221 corresponding to the liquid leaking holes 23.

The above-mentioned electrical core apron that preferred embodiment provided through set up additional strengthening 22 on the battery connection piece to set up additional strengthening 22's thickness to be greater than the thickness of welding plane 21, can effectively increase the structural strength of battery connection piece 2, also can not influence welding plane 21 welding effect simultaneously, improve the welding yield of battery connection piece 2 and electric core utmost point group 8, guarantee the electrical property of electric core. The provision of the reinforcing protrusions 222 and the reinforcing ribs 221 can further improve the structural strength of the junction of the battery connecting piece 2 and the fastener 3. The insulating connection of the cell connection tab 2 to the substrate can be achieved by arranging the insulating film 4 between the cell connection tab 2 and the substrate 1; the diameter ratio of the insulating film 4 to the battery connecting sheet 2 is (1.5-2):1, and the cell pole group 8 can be wrapped by the insulating film 4 positioned at the outer side of the outer edge of the battery connecting sheet 2, so that the use of the adhesive in the cell pole group 8 can be effectively reduced, the manufacturing cost can be reduced while the manufacturing steps are simplified, and the electrical performance of the cell can be ensured. Through the arrangement of the insulating ring 6 and the sealing ring 5, the electric insulation between the base plate 1 and the fastening piece 3 can be ensured, meanwhile, the sealing effect of the cover plate of the battery cell can also be ensured, and the electrical property of the battery cell can be improved; the setting of insulating piece 7 can prevent the wearing and tearing of base plate 1 to insulating film 4, guarantees insulating film 4's life, guarantees the electrical property of electric core simultaneously.

In a specific embodiment of the electric core of the present invention, referring to fig. 9-11, the electric core includes an electric core pole group 8, a casing 9 for wrapping the electric core pole group 8, and an electric core cover plate provided by any one of the above-mentioned specific embodiments of the electric core cover plate, the electric core cover plate is connected with the casing 9 in a sealing manner, and the battery connecting sheet 2 is connected with the electric core pole group 8 and is all disposed in the casing 9.

Wherein, the reinforcing structure 22 protrudes to the side far away from the cell pole group 8. The casing 9 is provided with a casing opening 91 suitable for clamping the cell cover plate.

When the battery core is installed, the welding plane 21 of the battery connecting sheet 2 is welded with the battery core pole group 8, the edge of the substrate 1 is provided with a welding seam capable of being welded with the shell 9, the substrate 1 is welded with the shell 9, and the substrate 1 is arranged in the shell opening 91.

The battery cell has all the advantages of the battery cell cover plate, and the description is omitted.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The battery core cover plate is characterized by comprising a base plate (1) and a battery connecting piece (2), wherein the base plate (1) is connected with the battery connecting piece (2) through a fastening piece (3), the fastening piece (3) has conductivity, the base plate (1) is connected with the fastening piece (3) and the base plate (1) is connected with the battery connecting piece (2) in an insulation sealing mode, the battery connecting piece (2) is provided with a welding plane (21) and a raised reinforcing structure (22), and the ratio of the thickness of the reinforcing structure (22) to the thickness of the welding plane (21) is 2:1-4: 1.

2. The cell cover plate of claim 1, characterized in that the reinforcing structure (22) comprises at least one reinforcement rib (221), at least one reinforcement rib (221) being arranged to extend from the center of the battery connection tab (2) to the outside.

3. The cell cover plate according to claim 2, wherein the reinforcing structure (22) further comprises a reinforcing protrusion (222) formed at a central position of the battery connecting piece (2), and one end of the reinforcing rib (221) is connected to the reinforcing protrusion (222).

4. The cell cover plate according to claim 2, wherein the welding plane (21) is further provided with a weep hole (23).

5. The cell cover plate according to claim 4, wherein the weep holes (23) are located on one side or both sides of the ribs (221) with a space between the weep holes and the ribs (221);

the liquid leakage holes (23) are long-strip-shaped through holes extending along the length direction of the reinforcing ribs (221) corresponding to the liquid leakage holes (23).

6. The cell cover plate according to any of claims 1 to 5, characterized in that an insulating film (4) is provided between the substrate (1) and the cell connecting plate (2), one side of the insulating film (4) is in contact with the reinforcing structure (22), and the outer edge of the insulating film (4) extends to the outside of the outer edge of the cell connecting plate (2).

7. The cell cover plate according to any of claims 1 to 5, wherein a sealing ring (5) and an insulating ring (6) are arranged between the fastening member (3) and the base plate (1), the inner side of the sealing ring (5) is attached to the fastening member (3), the outer side of the sealing ring is attached to the base plate (1), and the insulating ring (6) is arranged at the periphery of the sealing ring (5).

8. The cell cover plate according to claim 7, characterized in that the base plate (1) is provided with a base plate protrusion (11) for preventing the insulating ring (6) from moving, and the insulating ring (6) is provided with an insulating ring covering edge (61) capable of wrapping a top cover of the fastener (3).

9. The cell cover plate according to claim 6, characterized in that an insulating sheet (7) is arranged between the insulating film (4) and the base plate (1).

10. An electric core, characterized in that, a core electrode group (8), a casing (9) for wrapping the core electrode group (8) and a core cover plate according to any one of claims 1 to 9 are provided, the core cover plate and the casing (9) are hermetically connected, and the battery connecting sheet (2) is connected with the core electrode group (8) and is arranged in the casing (9).