CN219696576U

CN219696576U - Cover plate assembly and battery

Info

Publication number: CN219696576U
Application number: CN202320676097.2U
Authority: CN
Inventors: 王珂
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-03-28
Filing date: 2023-03-28
Publication date: 2023-09-15
Anticipated expiration: 2033-03-28

Abstract

The utility model discloses a cover plate component and a battery, wherein the cover plate component comprises: a top cover sheet; the pole is arranged on the top cover plate; the sealing piece is arranged between the top cover sheet and the pole, the sealing piece comprises an outer sealing piece and an inner sealing piece which are adjacently arranged, the inner sealing piece is tightly attached to the pole, and the outer sealing piece is arranged on one side, deviating from the pole, of the inner sealing piece. The sealing element comprises the outer sealing element and the inner sealing element, the inner sealing element is tightly attached to the pole, the outer sealing element is arranged on one side, away from the pole, of the inner sealing element, when electrolyte contacts with the sealing element in the cover plate assembly, the outer sealing element is preferentially corroded by the electrolyte, so that the time of the inner sealing element corroded by the electrolyte is delayed, the service life of the inner sealing element is prolonged, the sealing effect is improved, and good sealing effect of the battery can be achieved, and leakage is avoided.

Description

Cover plate assembly and battery

Technical Field

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

Background

The cover plate component is an important part of the battery and comprises a pole and a top cover plate, wherein the top cover plate is provided with a through hole penetrating along the thickness direction of the top cover plate so as to accommodate the pole, and a sealing ring is sleeved on the radial periphery of the pole so as to ensure insulation between the pole and the top cover plate. Because the sealing ring is generally made of plastic or rubber, electrolyte can easily corrode the sealing ring once contacting the sealing ring, and aging of the sealing ring is accelerated, so that liquid leakage is caused.

Disclosure of Invention

In order to solve the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a cover plate assembly, which can prolong the time for which the sealing member is corroded by the electrolyte, thereby prolonging the service life of the sealing ring.

In order to solve the above-mentioned drawbacks in the prior art, a second object of the present utility model is to provide a battery with a good sealing effect, which is not easy to leak when inverted.

According to one of the purposes of the utility model, the technical scheme is as follows:

a cover plate assembly comprising:

a top cover sheet;

the pole is arranged on the top cover plate;

the sealing piece is arranged between the top cover sheet and the pole, the sealing piece comprises an outer sealing piece and an inner sealing piece which are adjacently arranged, the inner sealing piece is tightly attached to the pole, and the outer sealing piece is arranged on one side, deviating from the pole, of the inner sealing piece.

Compared with the prior art that the top cover sheet and the pole are sealed by a sealing ring, the sealing member comprises an outer sealing member and an inner sealing member, the inner sealing member is closely attached to the pole, and the outer sealing member is arranged on one side, away from the pole, of the inner sealing member. When the electrolyte contacts the seal in the cover plate assembly, the outer seal is preferentially corroded by the electrolyte, thereby delaying the time that the inner seal is corroded by the electrolyte, and further prolonging the service life and sealing effect of the inner seal.

The technical scheme provided by the second purpose of the utility model is as follows:

a battery comprises the cover plate assembly.

The battery comprises the cover plate assembly, and the sealing element in the cover plate assembly comprises the inner sealing element and the outer sealing element, so that the electrolyte preferentially corrodes the outer sealing element, the corrosion of the inner sealing element is delayed, the service life of the inner sealing element is prolonged, and therefore a good sealing effect can be achieved, and leakage is avoided.

Drawings

FIG. 1 is a schematic view of a cover plate assembly according to an embodiment;

FIG. 2 is an exploded view of a cover plate assembly according to an embodiment;

FIG. 3 is a cross-sectional view of a cover plate assembly in an embodiment;

FIG. 4 is an enlarged view of FIG. 3 at A;

fig. 5 is a schematic diagram of another structure at a in fig. 3.

Wherein the reference numerals have the following meanings:

1. a top cover sheet; 11. a through hole; 13. a liquid injection hole; 14. explosion-proof holes; 2. a pole; 21. an extension; 22. a pole body; 3. a seal; 31. an outer seal; 32. an inner seal; 5. lower plastic; 51. a first through hole; 52. a second through hole; 53. a ventilation groove; 6. a transfer sheet; 7. an explosion-proof valve.

Detailed Description

For a better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

The embodiment discloses a cover plate assembly and a battery with the cover plate assembly, and the description of the cover plate assembly and the battery direction in the embodiment refers to fig. 1, wherein the X direction is a length direction, the left side along the length direction is a left side, the right side along the length direction is a right side, the Y direction is a width direction, the front side along the width direction is a front side, the rear side along the width direction is a rear side, the Z direction is a thickness direction or a height direction, the upper side along the thickness direction or the height direction is an upper side, and the lower side along the thickness direction or the height direction is a lower side.

The battery of this embodiment includes casing, electric core and apron subassembly, and the electric core is established in the casing, and the apron subassembly is established in the opening part of casing to seal the electric core in the casing through casing and apron subassembly. The cover plate assembly is an important part of the battery, referring to fig. 1 and 2, the cover plate assembly comprises a top cover plate 1 and a lower plastic 5 which are arranged in a vertically stacked mode, and the top cover plate 1 is arranged above the lower plastic 5 and corresponds to the lower plastic 5. The top sheet 1 is provided with a through hole 11, a liquid injection hole 13 and a explosion-proof hole 14, and the through hole 11, the liquid injection hole 13 and the explosion-proof hole 14 penetrate the top sheet 1 in the thickness direction. The lower plastic 5 is provided with a first through hole 51 corresponding to the through hole 11, a second through hole 52 corresponding to the liquid injection hole 13, and a ventilation groove 53 corresponding to the explosion-proof hole 14, which penetrate in the thickness direction. The liquid injection hole 13 and the second through hole 52 are vertically arranged so as to inject electrolyte into the casing. The explosion-proof hole 14 corresponds the setting from top to bottom with ventilative groove 53, is equipped with explosion-proof valve 7 between top cap piece 1 and the lower plastic 5, and explosion-proof valve 7 lid is established on ventilative groove 53, and explosion-proof valve 7's top passes explosion-proof hole 14 to be convenient for release the interior high-pressure gas of casing through explosion-proof valve 7. In this embodiment, the liquid injection hole 13 and the explosion-proof hole 14 are disposed in the middle area of the top cover sheet 1 in the length direction, the second through hole 52 and the air-permeable slot 53 are disposed in the middle area of the lower plastic 5 in the length direction, and in practical production applications, the positions of the liquid injection hole 13, the explosion-proof hole 14, the second through hole 52 and the air-permeable slot 53 can be adjusted as required.

The cover plate assembly further comprises a pole 2, the pole 2 being arranged at the through hole 11. The battery has two poles 2, positive pole and negative pole, respectively, and thus the through hole 11 has two. In this embodiment, the positive electrode post and the negative electrode post are respectively provided at both ends of the top cover sheet 1 in the longitudinal direction, and correspondingly, the two through holes 11 are respectively provided at both ends of the top cover sheet 1 in the longitudinal direction. The positive electrode post and the negative electrode post have the same structure, and the positive electrode post and the negative electrode post are not separately described below, and are collectively described as a post 2. Referring to fig. 2, the size of the pole 2 is adapted to the sizes of the through hole 11 and the first through hole 51 such that the top end of the pole 2 passes through the through hole 11 and extends upward, and the bottom end of the pole 2 passes through the first through hole 51 and extends downward. The bottom of lower plastic 5 is equipped with changeover piece 6, and the bottom of utmost point post 2 extends downwards and is connected with changeover piece 6 after passing first through-hole 51, and changeover piece 6 passes through the electric core in the lug connection casing to form the electric path.

In the prior art, in order to avoid the contact conduction between the pole 2 and the top cover plate 1, a sealing ring is arranged between the pole 2 and the through hole 11, and the sealing ring is provided with one sealing ring which is sleeved on the periphery of the pole 2 and is positioned between the periphery of the pole 2 and the inner wall of the through hole 11. When the battery is placed upside down, electrolyte in the battery shell flows to the cover plate assembly due to gravity, so that the sealing ring is soaked by the electrolyte, aging of the sealing ring is accelerated, and leakage is easy to cause. Or when the battery is normally placed, the sealing ring is also easy to corrode and age once contacting the electrolyte. To solve this problem, in this embodiment, a seal member 3 is provided between the top cover sheet 1 and the pole 2, and referring to fig. 3 and 4, the seal member 3 includes an outer seal member 31 and an inner seal member 32 that are adjacently disposed, the inner seal member 32 is disposed closely to the pole 2, and the outer seal member 31 is disposed on a side of the inner seal member 32 facing away from the pole 2. Compared with the prior art that the top cover sheet 1 and the pole 2 are sealed by a sealing ring, the sealing member 3 of the embodiment comprises the outer sealing member 31 and the inner sealing member 32, when the electrolyte contacts the sealing member 3 and even the battery is inverted, the electrolyte flows to the cover plate assembly, the outer sealing member 31 is preferentially corroded by the electrolyte, so that the time of the inner sealing member 32 corroded by the electrolyte is delayed, the service life of the inner sealing member 32 is prolonged, the sealing effect of the battery is improved, and the leakage is avoided.

Specifically, the seal member 3 is fitted around the radial outer periphery of the pole 2, and the seal member 3 is sandwiched between the inner wall of the through hole 11 and the outer wall of the pole 2. More specifically, the inner seal 32 is fitted around the outer periphery of the pole 2, and the inner wall of the inner seal 32 is closely attached to the outer wall of the pole 2, while the outer seal 31 is fitted around the radially outer periphery of the inner seal 32. In this embodiment, the inner seal 32 and the outer seal 31 may be selected from seal rings commonly known in the art.

Referring to fig. 4, the pole 2 includes a pole body 22 and an extension portion 21, wherein a top end of the pole body 22 passes through the through hole 11 and extends upward, and a bottom end of the pole body 22 passes through the first through hole 51 and extends downward to be connected with the adapter piece 6. The outer periphery of the pole body 22 corresponding to the first through hole 51 extends radially toward the first through hole 51 to form an extension portion 21, the extension portion 21 is located below the top cover sheet 1, and a space exists between the extension portion 21 and the top cover sheet 1 in the thickness direction. The inner sealing member 32 is an L-shaped sealing ring, that is, the cross section of the inner sealing member 32 in the thickness direction is L-shaped, the vertical portion of the L-shaped sealing ring is sleeved on the radial outer periphery of the pole body 22 and is attached to the inner wall of the through hole 11, and the horizontal portion of the L-shaped sealing ring extends from the bottom of the vertical portion to the position between the top cover sheet 1 and the extending portion 21 along the radial outward direction. The outer seal 31 is fitted around the outer periphery of the horizontal portion, and the outer seal 31 is provided between the top cover sheet 1 and the extension portion 21. Thus, the present embodiment achieves insulation of the pole 2 from the top cover sheet 1 by the inner seal 32 and the outer seal 31.

Referring to fig. 2, the outer sealing member 31 may be an O-ring, that is, the cross section of the outer sealing member 31 is circular along the length direction, the outer sealing member 31 is in line contact or surface contact with the inner sealing member 32, a certain space exists between the outer sealing member 31 and the inner sealing member 32, and when the electrolyte completely corrodes the outer sealing member 31, the electrolyte does not directly spread to the inner sealing member 32, thereby delaying corrosion of the inner sealing member 32 and prolonging the service life of the inner sealing member 32.

On the basis, the outer sealing element 31 and the inner sealing element 32 can be arranged at intervals, and the time for the electrolyte to spread from the outer sealing element 31 to the inner sealing element 32 is delayed through the interval arrangement, so that the service life of the inner sealing element 32 is prolonged. The spacing between the outer seal 31 and the inner seal 32 is 0-1mm, which can not only meet the requirement of delaying the spreading time of the electrolyte to the inner seal 32, but also avoid the influence of the excessive spacing between the outer seal 31 and the inner seal 32 on the sealing effect.

Further, referring to fig. 5, a heat conducting insulating glue is disposed in the gap between the outer sealing member 31 and the inner sealing member 32, on one hand, the heat conducting insulating glue can rapidly conduct the heat of the pole 2 to the top cover sheet 1, so as to facilitate the overall heat dissipation of the battery; on the other hand, compared with the air in the gap between the outer sealing member 31 and the inner sealing member 32, the insulation effect of the heat conduction insulating adhesive is better, and insulation failure between the pole 2 and the top cover sheet 1 caused by moist air is avoided.

In addition, an insulation limiting block can be arranged in the gap between the outer sealing piece 31 and the inner sealing piece 32, and firstly, compared with the air in the gap between the outer sealing piece 31 and the inner sealing piece 32, the insulation effect of the insulation limiting block is better, and insulation failure between the pole 2 and the top cover piece 1 caused by moist air is avoided; secondly, the arrangement of the insulating limiting block further delays the time for the electrolyte to spread from the outer sealing element 31 to the inner sealing element 32, so that the service life of the inner sealing element 32 is further prolonged; thirdly, the setting of insulating stopper can carry out spacingly to the compression volume of interior sealing member 32 and outer sealing member 31, avoids excessive deformation and influences sealed effect.

Referring to fig. 5, the outer seal member 31 may be an inverted L-shaped seal ring, that is, the cross section of the outer seal member 31 in the thickness direction is inverted L-shaped, a horizontal portion of the inverted L-shaped seal ring is sleeved on a radial outer periphery of a horizontal portion of the L-shaped seal ring, and the horizontal portion of the inverted L-shaped seal ring is located between the top cover plate 1 and the extension portion 21. The vertical portion of falling L type sealing washer is established in the one end that the utmost point post body 22 was kept away from to the horizontal part, and the outer wall downwardly extending of the inner wall laminating extension 21 of vertical portion, the inner wall of the outer wall laminating first through-hole 51 of vertical portion simultaneously to when making the insulating top cover piece 1 of outer seal 31 and utmost point post 2, guarantee fine sealed effect between utmost point post 2 and the lower plastic 5. The arrangement of the inverted L-shaped outer sealing piece 31 can prevent electrolyte from flowing between the pole column 2 and the top cover piece 1 when the battery is inverted, reduce the risk of insulation failure, improve the sealing area of the sealing piece 3 and ensure good sealing effect.

In addition, the embodiment is only described by taking one external sealing member 31 as an example, and in practical application, two or more external sealing members 31 may be provided according to the sealing requirement.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims

1. A cover plate assembly, comprising:

a top cover sheet;

a pole provided on the top cover sheet;

the sealing piece is arranged between the top cover piece and the pole, the sealing piece comprises an outer sealing piece and an inner sealing piece which are adjacently arranged, the inner sealing piece is tightly attached to the pole, and the outer sealing piece is arranged on one side, deviating from the pole, of the inner sealing piece.

2. A cover plate assembly according to claim 1, wherein: the top cover piece is provided with a through hole penetrating through the top cover piece along the thickness direction of the top cover piece, the pole is arranged at the through hole in a penetrating mode, the sealing piece is sleeved on the radial periphery of the pole, and the sealing piece is clamped between the inner wall of the through hole and the outer wall of the pole.

3. A cover plate assembly according to claim 2, wherein: the inner sealing piece is sleeved on the periphery of the pole, the inner wall of the inner sealing piece is tightly attached to the outer wall of the pole, and the outer sealing piece is sleeved on the radial periphery of the inner sealing piece.

4. A cover plate assembly according to claim 1, wherein: the outer seal is provided with at least one.

5. A cover plate assembly according to claim 1, wherein: the outer sealing piece and the inner sealing piece are arranged at intervals.

6. A cover plate assembly as claimed in claim 5, wherein: the spacing between the outer seal and the inner seal is 0-1mm.

7. A cover plate assembly as claimed in claim 5, wherein: and heat conduction insulating glue is arranged between the outer sealing piece and the inner sealing piece.

8. A cover plate assembly as claimed in claim 5, wherein: an insulating limiting block is arranged between the outer sealing piece and the inner sealing piece.

9. A cover plate assembly according to claim 2, wherein: the bottom end of the pole extends to the lower part of the top cover sheet along the radial direction towards the periphery of the pole to form an extension part, a space exists between the extension part and the top cover sheet along the thickness direction, and the inner sealing piece is L-shaped so as to isolate the pole from the inner wall of the through hole and isolate the extension part from the top cover sheet;

the outer sealing member is reverse L-shaped, the outer sealing member is arranged between the top cover sheet and the extension part, and the outer sealing member covers the periphery of the extension part.

10. A battery, characterized in that: a cover assembly comprising any one of claims 1 to 9.