CN220544071U

CN220544071U - Battery cover plate and battery

Info

Publication number: CN220544071U
Application number: CN202320919922.7U
Authority: CN
Inventors: 娄帅帅; 侯世界
Original assignee: Hefei Energy Storage Technology Co ltd
Current assignee: Hefei Energy Storage Technology Co ltd
Priority date: 2023-04-19
Filing date: 2023-04-19
Publication date: 2024-02-27
Anticipated expiration: 2033-04-19

Abstract

The utility model provides a battery cover plate and a battery. The battery cover plate includes: the substrate is provided with two through holes at intervals; the positive pole post and the negative pole post are arranged corresponding to the two through holes, one end of each pole post is respectively positioned in the corresponding through hole, the other end of each pole post is protruded out of the surface of the substrate, the negative pole post is fixedly connected with the substrate, and the positive pole post is welded with the substrate. According to the technical scheme, the electrode posts and the base plate are connected by adopting a welding process, and the stability of the battery cover plate is higher, so that the service life of the battery cover plate can be prolonged.

Description

Battery cover plate and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery cover plate and a battery.

Background

At present, the battery cover plate comprises a substrate, a positive pole column and a negative pole column, wherein two through holes are formed in the substrate, and the positive pole column and the negative pole column are respectively located in the two through holes and fixedly connected with the substrate. In the prior art, the positive pole post and the negative pole post are fixedly connected with the substrate through an injection molding process respectively, but injection molding defects, such as injection molding filling defects or bubbles and the like, are easy to occur in an injection molding structure, so that the product quality is influenced, or in the injection molding process, if the temperature is not high enough or the time is not long enough, the fixing performance of the battery cover plate and the positive pole post is also influenced, that is, the stability of the injection molding battery cover plate is poor, and the service life of the battery cover plate is influenced.

Disclosure of Invention

The utility model mainly aims to provide a battery cover plate and a battery, which are used for solving the problems that the stability of the battery cover plate is poor and the service life of the battery cover plate is further influenced due to the fact that the battery cover plate is molded by an injection molding process in the prior art.

In order to achieve the above object, according to one aspect of the present utility model, there is provided a battery cover plate comprising: the substrate is provided with two through holes at intervals; the positive pole post and the negative pole post are arranged corresponding to the two through holes, one end of each pole post is respectively positioned in the corresponding through hole, the other end of each pole post is protruded out of the surface of the substrate, the negative pole post is fixedly connected with the substrate, and the positive pole post is welded with the substrate.

Further, the battery cover plate further includes: the insulating piece is sleeved outside the negative pole column; and the first welding pressing plate is provided with a first avoidance through hole for the negative pole to pass through, is pressed on at least part of the negative pole and is connected with the base plate in a welding way.

Further, the battery cover plate further comprises a first rotation stopping structure, the first rotation stopping structure is arranged on the negative pole column and the insulating piece and is used for preventing relative rotation between the negative pole column and the insulating piece.

Further, the insulator is provided with an installation through hole for the negative pole to pass through, the first rotation stopping structure comprises a first rotation stopping groove and a first rotation stopping protrusion which can be in concave-convex fit, one of the first rotation stopping groove and the first rotation stopping protrusion is arranged on the outer wall of the negative pole, and the other of the first rotation stopping groove and the first rotation stopping protrusion is arranged on the inner wall surface of the installation through hole.

Further, the battery cover plate further comprises a second rotation stopping structure, the second rotation stopping structure comprises a second rotation stopping groove and a second rotation stopping protrusion which can be in concave-convex fit, one of the second rotation stopping groove and the second rotation stopping protrusion is arranged on the outer wall of the insulating piece, and the other of the second rotation stopping groove and the second rotation stopping protrusion is arranged on the inner wall surface of the first avoidance through hole.

Further, the upper surface of the negative electrode post is provided protruding from the insulating member, and a height difference between the upper surface of the negative electrode post and the upper surface of the insulating member ranges from 0.5mm to 2mm; and/or the positive pole column and/or the negative pole column comprises a first column section and a second column section which are connected and have sequentially increased outer diameters, and a step surface is formed between the second column section and the first column section.

Further, the at least one through hole comprises a first hole section and a second hole section with the inner diameters increased in sequence, the connection part of the first hole section and the second hole section forms an installation step surface, and the positive pole post or the negative pole post can be positioned in the second hole section and is abutted to the installation step surface.

Further, the battery cover plate further comprises a sealing member, and the sealing member is arranged between the mounting step surface and the negative electrode column.

Further, the battery cover plate further includes: the conductive piece is sleeved on the periphery of the positive pole; and the second welding pressing plate is provided with a second avoidance through hole for the positive pole to pass through, is pressed on at least part of the positive pole and is connected with the substrate in a welding way.

Further, the resistance value of the conductive member ranges from 20Ω to 10000 Ω.

According to another aspect of the present utility model, there is provided a battery cover plate comprising: the substrate is provided with two through holes at intervals; the positive pole and the negative pole are respectively and correspondingly arranged in the two through holes in a penetrating way, and the positive pole is fixedly connected with the substrate; the insulating piece is arranged outside the negative pole column; and the first welding pressing plate is provided with a first avoidance through hole for the negative pole to pass through, is pressed on at least part of the negative pole and is connected with the base plate in a welding way.

According to another aspect of the utility model, a battery is provided, which comprises a housing, a battery core arranged in the housing, and the battery cover plate covered on the housing, wherein two lugs of the battery core respectively penetrate into two through holes and are correspondingly and electrically connected with a positive pole and a negative pole.

By applying the technical scheme of the utility model, the positive pole post is directly welded with the substrate to form after being mounted to the through hole, the process is simple, the connection stability between the substrate and the positive pole post is higher by the welding process, compared with injection molding, the positive pole post has better stop effect, and the relative movement or relative rotation between the positive pole post and the substrate can be avoided. Because positive pole and base plate welded connection, the positive pole only need design for the required height of electricity connection can, need not to additionally set up the required utmost point post section of rivet connection, like this, the high less of positive pole, the through-hole is worn out to the up end of positive pole for be connected with external equipment electricity, the lower terminal surface of positive pole is located the through-hole, that is to say, can avoid the lower terminal surface of positive pole to wear to occupy the battery inner space after the through-hole to improve battery capacity. In addition, compared with a rivet connection mode, the welding connection does not occupy the lower surface of the positive pole, the welding area of the positive pole and the battery cell is increased, and the operation is convenient.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 shows a schematic structural view of an embodiment of a battery cover plate according to the present utility model;

FIG. 2 shows a cross-sectional view of the battery cover plate of FIG. 1 from another perspective;

FIG. 3 shows an enlarged view of the battery cover plate of FIG. 2;

fig. 4 shows a schematic structural view of a negative electrode post of the battery cap plate of fig. 1;

fig. 5 shows a schematic structural view of an insulator of the battery cover plate of fig. 1;

FIG. 6 shows a schematic structural view of a first weld platen of the battery cover plate of FIG. 1;

FIG. 7 illustrates a cross-sectional view of the first weld platen of FIG. 6 from another perspective; and

fig. 8 shows a bottom view of the battery cover plate of fig. 1.

Wherein the above figures include the following reference numerals:

1. a seal; 3. a substrate; 31. a through hole; 4. a first welding press plate; 41. the first avoidance through hole; 411. a second ring member; 412. a second flange; 413. a first bore section; 414. a second bore section; 415. a mounting surface; 5. a conductive member; 51. a second welding press plate; 53. a stop rack; 6. a positive electrode post; 61. a first column section; 62. a second column section; 63. a step surface; 7. an insulating member; 71. mounting through holes; 711. a first ring member; 712. a first flange; 713. an abutment surface; 8. a negative electrode column; 91. a second rotation stopping groove; 92. a second rotation stopping protrusion; 93. a first rotation stopping groove; 94. the first rotation stopping protrusion.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

In the prior art known to the inventors, the positive electrode post and the negative electrode post in the battery cover plate may be fixedly connected to the substrate by rivets, that is, the rivets pass through the positive electrode post and the substrate in order to connect the positive electrode post and the substrate. In the rivet connection process, on one hand, the weight of the rivet is large, and the effect of light weight of the battery cover plate cannot be realized; on the other hand, in addition to the pole section necessary for the electrical connection, the pole needs to be additionally provided with a pole section through which the rivet passes, and in order to ensure that the pole and the substrate have sufficient connection strength, the pole section needs to be provided with a certain thickness, which results in a higher overall height of the pole, the lower end surface of the pole penetrates out of the lower end surface of the substrate by a certain distance and occupies the internal space of the battery, which results in a reduction in the space for accommodating the battery cell inside the battery, a reduction in the battery capacity, and the battery module inside the battery is inconvenient to repair. And because the rivet occupies part of the lower surface of the pole, the welding area of the lower surface of the pole is small, and the welding of the pole and the battery cell is inconvenient.

Example 1

As shown in fig. 1, a first embodiment of the present utility model provides a battery cover plate. The battery cover plate includes: a base plate 3, wherein two through holes 31 are formed on the base plate 3 at intervals; the positive pole post 6 and the negative pole post 8 are correspondingly arranged with the two through holes 31, one end of each pole post is respectively positioned in the corresponding through hole 31, the other end of each pole post is protruded out of the surface of the substrate 3, the negative pole post 8 is fixedly connected with the substrate 3, and the positive pole post 6 is welded with the substrate 3.

The positive electrode post 6 is directly welded to the substrate 3, and the positive electrode post 6 is electrically connected to the substrate 3 to positively charge the substrate 3, thereby preventing corrosion of the case.

Through the arrangement, on the one hand, after the positive pole 6 is mounted to the through hole 31, the positive pole 6 and the substrate 3 can be directly welded to form, the process is simple, the connecting stability between the substrate and the positive pole 6 is higher due to the welding process, the positive pole has a better stopping effect compared with injection molding, and relative movement or relative rotation between the positive pole 6 and the substrate 3 can be avoided. On the other hand, because the positive electrode column 6 is welded with the substrate 3, the positive electrode column 6 is only required to be designed into the height required by electric connection, and the required electrode column section of rivet connection is not required to be additionally arranged, so that the height of the positive electrode column 6 is smaller, the upper end face of the positive electrode column 6 penetrates out of the through hole 31 and is used for being electrically connected with external equipment, the lower end face of the positive electrode column 6 is positioned in the through hole 31, that is, the lower end face of the positive electrode column 6 can be prevented from penetrating out of the through hole 31 and occupying the internal space of the battery, and the battery capacity is improved. In addition, compared with a rivet connection mode, the welding connection does not occupy the lower surface of the positive pole 6, the weldable area of the positive pole 6 and the battery cell is increased, and the operation is convenient. The cost of the welding process is lower than if the injection molding process were to be completed with specialized production lines and equipment.

In one embodiment of the utility model, the substrate 3 is made of aluminum.

As shown in fig. 1 to 3, in the first embodiment of the present utility model, the battery cover further includes: the insulating piece 7 is sleeved outside the negative pole column 8; the first welding pressing plate 4 is provided with a first avoiding through hole 41 for the negative pole 8 to pass through, the first welding pressing plate 4 is pressed on at least part of the negative pole 8, and the first welding pressing plate 4 is in welding connection with the substrate 3.

In the above technical scheme, the through hole 31 includes a first hole section and a second hole section with sequentially increased inner diameters, the junction of the first hole section and the second hole section forms an installation step surface, the negative electrode column 8 is located in the second hole section and the lower end surface of the negative electrode column 8 is abutted with the installation step surface. The negative electrode column 8 includes a first column section 61 and a second column section 62 which are connected and sequentially increase in outer diameter, and a step surface 63 is formed between the second column section 62 and the first column section 61. The insulating piece 7 and the first welding pressing plate 4 are of annular structures, the insulating piece 7 is sleeved on the periphery of the first column section 61 of the negative electrode column 8, and the end face of the insulating piece 7 is abutted against the step face 63 of the negative electrode column 8. The radial inner side of the first welding pressing plate 4 is pressed on the negative pole column 8 and the insulating member 7, and the radial outer side of the first welding pressing plate 4 is abutted against and welded with the substrate 3.

Through the above-mentioned setting, set up first welding clamp plate 4 and can adopt welding process to connect negative pole post 8 and base plate 3 to through setting up insulating part 7, can avoid the problem that leads to the short circuit because of the electricity is connected between negative pole post 8 and the base plate 3, further strengthened battery cover's stability.

In one embodiment of the utility model, the first welding press plate 4 has a thickness of 0.5mm-3mm.

As shown in fig. 4 to 6, in the first embodiment of the present utility model, the battery cover further includes a first rotation stopping structure disposed on the negative electrode post 8 and the insulating member 7, and the first rotation stopping structure is used to prevent relative rotation between the negative electrode post 8 and the insulating member 7.

In the above technical solution, the insulator 7 is provided with the mounting through hole 71 through which the negative electrode post 8 passes, the first rotation stopping structure includes a first rotation stopping groove 93 and a first rotation stopping protrusion 94 which can be in concave-convex fit, the first rotation stopping groove 93 is disposed on the outer wall of the negative electrode post 8, and the first rotation stopping protrusion 94 is disposed on the inner wall surface of the mounting through hole 71. The insulator 7 includes a first annular member 711 and a first flange 712 provided on one side of the first annular member 711, the outer diameter of the first flange 712 is larger than that of the first annular member 711, an abutment surface 713 is formed between the first flange 712 and the first annular member 711, and the mounting through hole 71 penetrates the first flange 712 and the first annular member 711. The first annular member 711 is fitted around the outer periphery of the negative electrode column 8, the first flange 712 abuts against the step surface 63 of the negative electrode column, and the first rotation preventing protrusion 94 is provided on the first annular member 711. The number of the first rotation stopping structures is two, and the two first rotation stopping structures are arranged at intervals in the circumferential direction of the negative electrode column 8 and the insulator 7.

Through the above-mentioned setting, during the assembly, insulator 7 cover is established in the periphery of negative pole post 8 to make first rotation stopping protruding 94 be located first rotation stopping groove 93, through first rotation stopping protruding 94 with the unsmooth cooperation of first rotation stopping groove 93, can realize stopping between insulator 7 and the negative pole post 8.

In another embodiment of the present utility model, the first rotation stopping protrusion 94 is provided on the outer wall of the negative electrode post 8, and the first rotation stopping groove 93 is opened on the inner wall of the mounting through hole 71.

In another embodiment of the present utility model, the first rotation stopping structure may be three or more.

As shown in fig. 4 to 7, in the first embodiment of the present utility model, the battery cover plate further includes a second rotation stopping structure including a second rotation stopping groove 91 and a second rotation stopping protrusion 92 capable of being mated with each other in a concave-convex manner, one of the second rotation stopping groove 91 and the second rotation stopping protrusion 92 is provided on the outer wall of the insulator 7, and the other of the second rotation stopping groove 91 and the second rotation stopping protrusion 92 is provided on the inner wall surface of the first escape through hole 41.

In the above technical solution, the first welding platen 4 includes the second ring 411 and the second flange 412 disposed on one side of the second ring 411, the outer diameter of the second flange 412 is larger than the outer diameter of the second ring 411, the second rotation stopping protrusion 92 is disposed on the second ring 411, and the second flange 412 abuts against and is welded to the substrate 3. The second rotation stopping groove 91 is formed on one side of the first rotation stopping protrusion 94, so that the processing is convenient, and the space occupied by the first rotation stopping structure and the second rotation stopping structure in the circumferential direction of the insulating member 7 is saved. The number of the second rotation stopping structures is two, and the two second rotation stopping structures are arranged at intervals in the circumferential direction of the first welding pressing plate 4 and the insulating member 7.

The first avoidance through hole 41 penetrates through the second annular member 411 and the second flange 412, and the first avoidance through hole 41 comprises a first hole section 413 and a second hole section 414 with inner diameters sequentially increased, wherein the first hole section 413 is formed in the second annular member 411, and the second hole section 414 is formed in the second flange 412. In this way, the mounting surface 415 can be formed between the first hole section 413 and the second hole section 414, and since the partial structures of the insulator 7 and the negative electrode post 8 are provided protruding from the upper surface of the substrate 3, the second flange 412 is abutted against the substrate 3 at the time of assembly, and the mounting surface 415 of the first welding press plate 4 can be abutted against the partial insulator 7 protruding from the upper surface of the substrate 3 (i.e., the first flange 712 of the insulator 7).

Through the above-mentioned setting, when the assembly, first welding clamp plate 4 cover is established in the periphery of insulating part 7 to make the second stop the protruding 92 of changeing and be located the second and stop changeing inslot 91, through the unsmooth cooperation of second stop changeing inslot 91 and second stop changeing protruding 92, can realize the stopping between first welding clamp plate 4 and the insulating part 7, like this, can mutually stop changeing between first welding clamp plate 4, insulating part 7 and the negative pole post 8, that is, first welding clamp plate 4 is through insulating part 7 stopping changeing negative pole post 8, because first welding clamp plate 4 and base plate 3 welded connection, thereby can further realize stopping changeing between negative pole post 8 and the base plate 3, further improve the connection stability between negative pole post 8 and the base plate 3.

In another embodiment of the present utility model, the first rotation stopping protrusion 94 may also be provided at intervals in the circumferential direction of the insulator 7 with the second rotation stopping groove 91.

In another embodiment of the present utility model, the second rotation stopping structure may be three or more.

As shown in fig. 3, in the first embodiment of the present utility model, the upper surface of the anode post 8 is provided protruding from the insulating member 7, and the height difference between the upper surface of the anode post 8 and the upper surface of the insulating member 7 ranges from 0.5mm to 2mm.

Through the arrangement, as the upper surface of the negative pole column 8 needs to be polished when the battery is reworked, the negative pole column 8 is arranged to protrude out of the insulating piece 7, so that enough space is reserved for polishing operation, and the operation is convenient.

As shown in fig. 1 to 3, in the first embodiment of the present utility model, the battery cover plate further includes a seal member 1, and the seal member 1 is disposed between the mounting step surface and the anode post 8.

The negative electrode post 8 is welded to the substrate 3 by the first welding press plate 4, which is prone to problems such as poor air tightness and poor sealing between the negative electrode post 8 and the substrate 3.

With the above arrangement, at the time of assembly, after the first welding press plate 4 is pressed down to compress the sealing member 1 by 25% -50%, the first welding press plate 4 is welded to the substrate 3 by the laser. In this way, the sealing member 1 can fill the gap between the negative electrode column 8 and the substrate 3, thereby playing a role in sealing and improving the sealing performance of the battery cover plate.

As shown in fig. 2 and 8, in the first embodiment of the present utility model, the battery cover further includes a stopper 53 disposed below the base plate 3, and the stopper 53 is used to be connected with the case of the battery to stop between the battery cover and the case of the battery.

Example two

The second embodiment of the present utility model differs from the first embodiment only in that: the positive electrode post 6 is welded to the substrate 3 by the second welding press plate 51.

As shown in fig. 1 and 2, in the second embodiment of the present utility model, the battery cover further includes: the conductive piece 5 is sleeved on the periphery of the positive pole 6; the second welding pressing plate 51 is provided with a second avoidance through hole for the positive electrode column 6 to pass through, the second welding pressing plate 51 is pressed on at least part of the positive electrode column 6, and the second welding pressing plate 51 is in welding connection with the substrate 3.

In the above technical solution, the structure of the conductive member 5 is the same as that of the insulating member 7, the structure of the second welding pressing plate 51 is the same as that of the first welding pressing plate 4, and the assembly relationship among the positive electrode post 6, the conductive member 5 and the second welding pressing plate 51 is the same as that among the negative electrode post 8, the insulating member 7 and the first welding pressing plate 4, which will not be described herein. A sealing material 1 is also provided between the positive electrode 6 and the substrate 3.

With the above arrangement, the positive electrode post 6 is welded to the substrate 3 by the second welding press plate 51.

In one embodiment of the present utility model, the conductive member 5 is a weak conductive member, and has a resistance ranging from 20Ω to 10000 Ω.

Other technical features of the second embodiment of the present utility model are the same as those of the first embodiment, and are not described here again.

Example III

The third embodiment of the present utility model differs from the first embodiment only in that: the negative electrode post 8 is connected to the substrate 3 by a welding process, and the positive electrode post 6 is connected to the substrate 3 by injection molding, rivets or the like.

The third embodiment of the present utility model also provides a battery cover plate, including: a base plate 3, wherein two through holes 31 are formed on the base plate 3 at intervals; the positive pole 6 and the negative pole 8 are respectively correspondingly arranged in the two through holes 31 in a penetrating way, and the positive pole 6 is fixedly connected with the substrate 3; an insulator 7 provided outside the negative electrode column 8; the first welding pressing plate 4 is provided with a first avoiding through hole 41 for the negative pole 8 to pass through, the first welding pressing plate 4 is pressed on at least part of the negative pole 8, and the first welding pressing plate 4 is in welding connection with the substrate 3.

Through the arrangement, the cathode column 8 is welded with the substrate 3 through the first welding pressing plate 4, and the anode column 6 can be connected with the substrate 3 by adopting processes of injection molding, riveting and the like.

Other structures of the third embodiment of the present utility model are the same as those of the first embodiment, and will not be described here again.

The embodiment of the utility model also provides a battery, which comprises a shell, a battery core arranged in the shell and the battery cover plate covered on the shell, wherein two lugs of the battery core respectively penetrate into two through holes 31 and are correspondingly and electrically connected with the positive pole column 6 and the negative pole column 8.

The battery of the utility model has all technical characteristics and all technical effects of the battery cover plate, and the description is omitted herein.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects: the conductive piece is sleeved on the periphery of the positive pole, so that weak conduction can be achieved, the insulating piece is sleeved on the periphery of the negative pole, and electric connection between the negative pole and the substrate can be avoided. A first rotation stopping structure is arranged between the pole and the conductive part or between the pole and the weak conductive part, and a second rotation stopping structure is arranged between the conductive part and the welding pressing plate or between the weak conductive part and the welding pressing plate, so that the positive pole and the negative pole are connected with the substrate through the welding pressing plate in a welding mode. The welding forming is simple in process, and the connecting stability is higher, so that the locking effect is better. Because the pole is welded with the base plate, the height of the pole is small, and the occupation of the internal space of the battery after the lower end face of the pole penetrates out of the through hole can be avoided, so that the battery capacity is improved. In addition, the welding connection does not occupy the lower surface of the pole, the welding area of the pole and the battery cell is increased, and the operation is convenient.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A battery cover plate, comprising:

a base plate (3), wherein two through holes (31) are formed in the base plate (3) at intervals;

the positive pole (6) and the negative pole (8) are arranged corresponding to the two through holes (31), one end of each pole is respectively positioned in the corresponding through hole (31), the other end of each pole is protruded out of the surface of the substrate (3), the negative pole (8) is fixedly connected with the substrate (3), and the positive pole (6) is welded with the substrate (3);

the insulating piece (7) is sleeved outside the negative pole column (8);

the first welding pressing plate (4) is provided with a first avoidance through hole (41) for the negative pole (8) to pass through, the first welding pressing plate (4) is pressed on at least part of the negative pole (8), and the first welding pressing plate (4) is in welding connection with the substrate (3);

the first rotation stopping structure is arranged on the negative pole column (8) and the insulating piece (7), and is used for preventing relative rotation between the negative pole column (8) and the insulating piece (7).

2. The battery cover plate according to claim 1, wherein the insulating member (7) is provided with a mounting through hole (71) through which the negative electrode post (8) passes, the first rotation stopping structure comprises a first rotation stopping groove (93) and a first rotation stopping protrusion (94) which can be in concave-convex fit, one of the first rotation stopping groove (93) and the first rotation stopping protrusion (94) is arranged on the outer wall of the negative electrode post (8), and the other of the first rotation stopping groove (93) and the first rotation stopping protrusion (94) is arranged on the inner wall surface of the mounting through hole (71).

3. The battery cover plate according to claim 1, further comprising a second rotation stopping structure including a second rotation stopping groove (91) and a second rotation stopping protrusion (92) capable of being in concave-convex fit, one of the second rotation stopping groove (91) and the second rotation stopping protrusion (92) being provided on an outer wall of the insulator (7), the other of the second rotation stopping groove (91) and the second rotation stopping protrusion (92) being provided on an inner wall surface of the first escape through hole (41).

4. The battery cover plate according to claim 1, wherein an upper surface of the negative electrode post (8) is provided protruding from the insulating member (7), and a height difference between the upper surface of the negative electrode post (8) and the upper surface of the insulating member (7) ranges from 0.5mm to 2mm; and/or the number of the groups of groups,

the positive pole (6) and/or the negative pole (8) comprise a first pole section (61) and a second pole section (62) which are connected and have sequentially increased outer diameters, and a step surface (63) is formed between the second pole section (62) and the first pole section (61).

5. The battery cover plate according to any one of claims 1 to 4, wherein at least one through hole (31) comprises a first hole section and a second hole section with sequentially increasing inner diameters, a mounting step surface is formed at the connection of the first hole section and the second hole section, and the positive electrode post (6) or the negative electrode post (8) can be positioned in the second hole section and abutted with the mounting step surface.

6. The battery cover plate according to claim 5, further comprising a seal (1), the seal (1) being arranged between the mounting step face and the negative post (8).

7. The battery cover plate according to any one of claims 1 to 4, further comprising:

the conductive piece (5) is sleeved on the periphery of the positive pole (6);

the second welding pressing plate is provided with a second avoidance through hole for the positive pole (6) to pass through, and is pressed on at least part of the positive pole (6), and is in welded connection with the substrate (3).

8. Battery cover according to claim 7, characterized in that the resistance of the conductive element (5) ranges from 20 Ω to 10000 Ω.

9. A battery cover plate, comprising:

the positive pole (6) and the negative pole (8) are respectively and correspondingly arranged in the two through holes (31) in a penetrating mode, and the positive pole (6) is fixedly connected with the substrate (3);

an insulator (7) provided outside the negative electrode column (8);

the first welding pressing plate (4) is provided with a first avoidance through hole (41) for the negative pole column (8) to pass through, the first welding pressing plate (4) is pressed on at least part of the negative pole column (8), and the first welding pressing plate (4) is in welded connection with the substrate (3).

10. A battery, characterized by comprising a shell, an electric core arranged in the shell, and a battery cover plate as set forth in any one of claims 1 to 9, wherein two lugs of the electric core are respectively penetrated into two through holes (31) and then are correspondingly and electrically connected with the positive pole (6) and the negative pole (8).