CN218456108U

CN218456108U - Battery cover plate assembly and battery

Info

Publication number: CN218456108U
Application number: CN202222510625.5U
Authority: CN
Inventors: 郭玄; 张雷; 钟罗浩; 赵赫; 黄利明
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2023-02-07
Anticipated expiration: 2032-09-21

Abstract

The utility model relates to a battery cover plate subassembly and battery, wherein, battery cover plate subassembly is including apron and closing cap, seted up on the apron and annotated the liquid hole, the apron has the first side that deviates from the battery inside, the sunken first recess that is provided with in first side, annotate the tank bottom that the liquid hole runs through first recess, the cell wall of first recess is provided with the block portion to the protrusion in first recess center, and the tank bottom interval of block portion and first recess is formed with the centre gripping space, the closing cap setting is in first recess, and the marginal card of closing cap is established in the centre gripping space. The utility model discloses battery cover plate subassembly simple structure, the equipment is convenient, and sealing performance is good.

Description

Battery cover plate assembly and battery

Technical Field

The utility model relates to a battery technology field especially relates to a battery cover plate subassembly to and contain the battery of this battery cover plate subassembly.

Background

In the manufacturing process of the battery, after the electrolyte is injected, the liquid injection hole needs to be sealed, if the liquid injection hole is not tightly sealed, the battery leakage can be caused, the performance of the battery can be reduced, the potential safety hazard is also great, and other parts around the battery can be easily corroded by the leaked electrolyte.

At present, the following sealing methods are commonly used: 1. the sealing cover is welded with the periphery of the liquid injection hole of the cover plate, the sealing mode has long welding time, and the risk of electrolyte leakage caused by untight welding seam can also exist; 2. seal through the rubber buffer with annotate liquid hole interference fit, the rubber buffer is ageing easily in the use, still falls into the battery easily inside, pollutes electrolyte, reduces battery life, and above-mentioned seal structure equipment process is complicated, inefficiency, wastes time and energy.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an aim at: the battery cover plate assembly is simple in structure and convenient to assemble.

The embodiment of the utility model provides a another aim at: the battery is low in production cost and high in safety.

To achieve the purpose, the embodiment of the present invention adopts the following technical solutions:

in a first aspect, a battery cover plate assembly is provided, and includes a cover plate and a seal cover, wherein a liquid injection hole is formed in the cover plate, the cover plate has a first side surface away from the inside of the battery, a first groove is concavely formed in the first side surface, the liquid injection hole penetrates through the bottom of the first groove, a stop portion is convexly formed on the wall of the first groove toward the center of the first groove, a clamping space is formed between the stop portion and the bottom of the first groove at an interval, and the seal cover is arranged in the first groove, and the edge of the seal cover is clamped in the clamping space.

As a preferable scheme of the battery cover plate assembly, a clamping table is arranged on the peripheral side wall of the sealing cover in a protruding mode towards one side, away from the center of the sealing cover, the clamping table is located at the bottom of the sealing cover, and the clamping table is clamped in the clamping space.

As a preferred scheme of the battery cover plate assembly, the clamping table is an annular clamping table, the stopping part is an annular stopping part, and the annular stopping part is attached to or abutted against the annular clamping table.

As a preferable scheme of the battery cover plate assembly, one end of the stop part, which is adjacent to the center of the first groove, is provided with a guide structure.

As a preferable scheme of the battery cover plate assembly, a sealing element is arranged between the sealing cover and the bottom of the first groove, and a vent hole communicated with the liquid injection hole is formed in the sealing element in a penetrating manner; the seal cover is concavely provided with a blasting groove along the axis direction of the seal cover, and the blasting groove is annularly arranged.

As a preferable scheme of the battery cover plate assembly, a second groove is concavely arranged on one side surface of the sealing cover facing the liquid injection hole, the sealing element is clamped between the groove bottom of the first groove and the groove bottom of the second groove, and the peripheral side surface of the sealing element is attached to or abutted against the groove wall of the second groove.

As a preferable scheme of the battery cover plate assembly, a second sealing part is convexly arranged on one side face of the bottom of the sealing element, which is attached to the first groove, along the periphery of the vent hole, and the peripheral side wall of the second sealing part is attached to or abutted against the hole wall of the liquid injection hole.

As a preferable mode of the battery cover plate assembly, the thickness of the sealing member is greater than the depth of the second groove.

As a preferable scheme of the battery cover plate assembly, the rupture groove is an annular groove, the size of an inner ring of the annular groove is larger than that of the vent hole, a third groove is concavely arranged on one side surface of the sealing element, which is adjacent to the groove bottom of the second groove, and the size of the third groove is larger than that of the vent hole.

As a preferable scheme of the battery cover plate assembly, a plurality of fourth grooves are concavely arranged on one side surface of the sealing element away from the groove bottom of the first groove, the plurality of fourth grooves are arranged around the periphery of the vent hole, and the notch of each fourth groove faces the blasting groove.

As a preferable scheme of the battery cover plate assembly, the depth of the annular groove is H1, the distance from the groove bottom of the second groove to the end surface of the sealing cover departing from the battery interior is H2, H1=0.2h2-0.5h2, the width of the annular groove is W, and W =0.5h1-1.5h1.

As a preferred scheme of the battery cover plate assembly, an explosion-proof hole is formed in one side face, away from the liquid injection hole, of the sealing cover, and a waterproof ventilation valve is arranged in the explosion-proof hole.

In a second aspect, a battery is provided, which includes a casing and a battery core disposed in the casing, wherein an opening is formed in the casing, and the battery cover plate assembly further includes the above-mentioned battery cover plate assembly, and the cover plate assembly blocks the opening.

The utility model discloses beneficial effect does: the clamping grooves are formed in the peripheral sides of the liquid injection holes in the cover plate to form clamping spaces which just contain the sealing covers, the sealing covers are directly clamped into the clamping spaces to seal the liquid injection holes, the sealing is firm and durable, extra welding is not needed, the structure is simple, the operation is easy, and the assembly efficiency is high; through the apron from taking draw-in groove with closing cap zonulae occludens in the apron outside to the liquid hole is annotated in the shutoff, and the seal is good, prevents simultaneously that partial structure from extending to inside the battery and causing the pollution.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and examples.

Fig. 1 is a cross-sectional view of a battery cover plate assembly according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a cover plate according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a closure according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a closure according to another embodiment of the present invention;

FIG. 5 is a cross-sectional view of a seal according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a sealing member according to an embodiment of the present invention.

In the figure:

1. a cover plate; 11. a liquid injection hole; 12. a first groove; 13. a stopper portion; 131. a guide structure; 14. a clamping space; 15. a first side surface; 16. a second side surface;

2. sealing the cover; 21. explosion-proof holes; 22. a waterproof vent valve; 23. clamping a platform; 24. a second groove; 25. a blasting groove;

3. a seal member; 31. a vent hole; 32. a third groove; 33. a second sealing part; 34. and a fourth groove.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1 and fig. 2, the battery cover plate assembly of the embodiment of the present invention includes a cover plate 1, a sealing cover 2 and a sealing member 3, wherein a liquid injection hole 11 is formed in the cover plate 1, the cover plate 1 has a first side surface 15 away from the inside of the battery and a second side surface 16 opposite to the first side surface 15, the second side surface 16 is located inside the battery, the first side surface 15 is provided with a first groove 12 in a concave manner, the liquid injection hole 11 penetrates through the bottom of the first groove 12, the wall of the first groove 12 protrudes toward the center of the first groove 12 and is provided with a blocking portion 13, a clamping space 14 is formed between the blocking portion 13 and the bottom of the first groove 12, the sealing cover 2 is arranged in the first groove 12, and the edge of the sealing cover 2 is clamped in the clamping space 14; annotate liquid hole 11 week side at apron 1 and set up the draw-in groove in order to form the centre gripping space 14 that just holds closing cap 2, directly advance the draw-in groove with closing cap 2 joint and can realize the sealed to annotating liquid hole 11, it is sealed firm and durable, do not need extra welding, moreover, the steam generator is simple in structure, easy to operate, high assembly efficiency, and the production cost is reduced, through apron 1 from taking the buckle with closing cap 2 and sealing member 3 zonulae occludens in the apron 1 outside, the seal is good, prevent simultaneously that partial structure from extending to the inside pollution that causes of battery.

Preferably, one end of the stop portion 13 adjacent to the center of the first concave groove 12 is provided with a guiding structure 131, in this embodiment, the guiding structure 131 is a rounded structure of the edge of the upper end surface of the stop portion 13 adjacent to the center of the liquid injection hole 11, and in other embodiments, a chamfer or other structure in which the end of the stop portion 13 adjacent to the liquid injection hole 11 is gradually reduced from the outside to the inside can also be adopted.

It can be understood that the cover 2 is clamped between the stop portion 13 and the bottom of the first groove 12, the stop portion 13 and the first groove 12 are formed in advance by a common means, the operator clamps the cover 2 into the clamping space 14, in this embodiment, the stop portion 13 is convexly disposed on the first side surface 15 of the cover plate 1 and circumferentially disposed along the first groove 12, the cover 2 is attached to the bottom of the first groove 12 along the groove wall of the first groove 12, the stop portion 13 originally convexly disposed on the first side surface 15 is riveted to the center of the first groove 12 by using a spin riveting process, so that the stop portion 13 is attached to the cover 2, so that the cover 2 abuts against the bottom of the first groove 12, thereby preventing the cover 2 from being damaged due to hard plugging, and the sealing is firm.

Preferably, as shown in fig. 3, a clamping table 23 is convexly arranged on the outer peripheral side wall of the sealing cover 2 and outwardly protrudes towards the side away from the center of the sealing cover 2, the clamping table 23 is located at the bottom of the sealing cover 2, the bottom of the sealing cover 2 is close to the side surface of the bottom of the first groove 12, the clamping table 23 is arranged to reduce the height of the clamping space 14, the thickness of the cover plate 1 is reduced, materials are saved, the occupied space of the battery shell structure is reduced, and the space utilization rate of the battery core is improved. Furthermore, in order to enable the stop portion 13 to abut against the clamping table 23 better, the clamping table 23 is set to be an annular clamping table, so that the sealing between the clamping table 23 and the bottom of the first groove 12 is facilitated, the stop portion 13 can be attached conveniently, the clamping table 23 does not need to be arranged at a designated angle intentionally, the calibration time is reduced, the stop portion 13 is an annular stop portion, and the situation that the stop portion 13 inclines along other directions when being riveted in a rotating mode to cause the untight abutting of the stop portion 13 and the clamping table 23 is avoided.

In one embodiment, a sealing element 3 is arranged between the sealing cover 2 and the bottom of the first groove 12, and a vent hole 31 communicated with the liquid injection hole 11 is formed in the sealing element 3 in a penetrating manner; the sealing cover 2 is concavely provided with the blasting groove 25 along the axis direction of the sealing cover, the blasting groove 25 is annularly arranged, and the liquid injection hole 11 is sealed by the sealing structure provided with the annular blasting groove 25, so that the phenomenon that one more anti-explosion hole 21 is formed in the cover plate 1 or the battery shell is reduced, one-time welding is reduced, the risk of welding seam leakage is reduced, and meanwhile, the safety performance of battery sealing is improved; the sealing cover 2 is provided with a weak area around the concave explosion groove 25 to serve as an explosion-proof valve, so that the additional arrangement of explosion-proof valve accessories in the explosion-proof hole 21 and the opening of the explosion-proof hole 21 is reduced, and the production cost is reduced

In the embodiment, the sealing element 3 is clamped between the sealing cover 2 and the bottom of the first groove 12 to strengthen the sealing between the sealing cover 2 and the cover plate 1 and prevent the electrolyte from flowing out of the connecting gap, the side surface of the sealing cover 2 facing the liquid injection hole 11 is concavely provided with the second groove 24, the thickness of the sealing element 3 is slightly larger than the depth of the second groove 24 so as to ensure that two end surfaces of the sealing element 3 are in interference fit with a space formed by the bottom of the first groove 12 and the bottom of the second groove 24, the peripheral side surface of the sealing element 3 is attached to or abutted against the groove wall of the second groove 24 to improve the sealing between the sealing element 3 and the sealing cover 2, furthermore, as shown in fig. 5, the side surface of the bottom of the sealing element 3 attached to or abutted against the first groove 12 is convexly provided with the second sealing part 33 along the periphery of the vent hole 31, and the peripheral side wall of the second sealing part 33 is attached to or abutted against the hole wall of the liquid injection hole 11, so that one more protection surfaces are arranged between the sealing element 3 and the cover plate 1, and the sealing effect of the sealing element 3 is further improved.

Preferably, the burst groove 25 is arranged on the end face of the sealing cover 2 departing from the interior of the battery, the burst groove 25 is a communicated annular groove to form a controllable fracture region, gas generated in the battery is in direct contact with the weak fracture region through the vent hole 31 from the liquid injection hole 11 in sequence, and the burst groove can be broken on the sealing cover 2 when the internal pressure of the battery reaches a set level, so that an explosion-proof function is achieved.

Alternatively, the depth of the annular groove is H1, the distance from the bottom of the second groove 24 to the end surface of the cover cap 2 facing away from the inside of the battery is H2, H1=0.2h2-0.5h2, the width of the annular groove is W, W =0.5h1-1.5h1, so as to ensure that there is enough fracture area for the internal pressure to burst along the burst groove 25, and the section of the annular groove may be fan-shaped, triangular, square, etc. in this embodiment, the annular groove is a groove with a semicircular section, which is easy to process, evenly stressed, highly sensitive, and easy to fracture, and the second groove 24 is also provided to make the thickness of the cover plate 1 thinner, and easy to burst.

Preferably, as shown in fig. 6, a plurality of fourth grooves 34 are concavely arranged on one side surface of the sealing member 3 away from the bottom of the first groove 12, the plurality of fourth grooves 34 are arranged around the periphery of the vent hole 31, the notch of the fourth groove 34 faces the blasting groove 25, the gas pressure in the battery is transmitted from the liquid injection hole 11 to the fourth groove 34 through the vent hole 31, when the internal pressure of the battery is too high, the fourth groove 34 is positioned right below the blasting groove 25, the pressure directly impacts the blasting groove 25 to blast outwards, so that the blasting groove 25 is stressed more directly when the gas pressure in the battery suddenly increases, and therefore the regional rapid rupture is realized, and the regional rapid rupture is not gathered on the central axis of the vent hole 31, the safety is high, and preferably, the center of the blasting groove 25 is positioned on the same axis with the center of the liquid injection hole 11 and the center of the vent hole 31, which is favorable for the gas pressure in the battery to directly contact with the weak area formed by the blasting groove 25.

Furthermore, as shown in fig. 4, an explosion-proof hole 21 is formed in a side surface of the sealing cover 2 away from the liquid injection hole 11, the explosion-proof hole 21 is located in the center of the explosion-proof groove 25, a waterproof vent valve 22 is disposed in the explosion-proof hole 21, so that a part of the gas inside the battery can be released, and the internal pressure bearing capacity of the battery is increased, preferably, the diameter of the explosion-proof hole 21 is equal to the diameter of the inner ring of the circular explosion-proof groove 25, so as to increase the contact area between the waterproof vent valve 22 and the gas inside the battery, so as to allow greater pressure release, and further enhance the internal pressure bearing capacity of the battery, and more preferably, a protection plate is further disposed in the explosion-proof hole 21, and the protection plate is located on the gas outlet side of the waterproof vent valve 22, so as to prevent dust, other corrosion-resistant substances, or external forces from damaging the waterproof vent valve 22 during use, and make the waterproof vent valve 22 more durable.

The utility model provides a battery, including casing and the electric core of setting in the casing, seted up the opening on the casing, the opening part sets up the battery cover plate subassembly as above arbitrary embodiment, and battery cover plate subassembly shutoff opening, the concrete structure of battery cover plate subassembly is no longer repeated. The utility model discloses a battery utilizes battery cover plate subassembly encapsulation opening, simple structure, the equipment is convenient, production efficiency.

In the description herein, it is to be understood that the terms "upper" and "lower" are used in a descriptive sense only and not for purposes of limitation, and are not to be construed as indicating or implying that a particular device or element must have a particular orientation, be constructed and operated in a particular manner, based on the orientation or positional relationship shown in the figures.

In the description herein, references to "an embodiment" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims

1. A battery cover plate assembly comprises a cover plate, wherein a liquid injection hole is formed in the cover plate, and the battery cover plate assembly is characterized by further comprising a sealing cover, the cover plate is provided with a first side face deviating from the interior of a battery, a first groove is concavely arranged on the first side face, the liquid injection hole penetrates through the groove bottom of the first groove, a blocking portion is convexly arranged on the groove wall of the first groove towards the center of the first groove, a clamping space is formed between the blocking portion and the groove bottom of the first groove at intervals, the sealing cover is arranged in the first groove, and the edge of the sealing cover is clamped in the clamping space.

2. The battery cover plate assembly according to claim 1, wherein a clamping table is arranged on the peripheral side wall of the sealing cover and protrudes outwards towards one side of the sealing cover, which is away from the center of the sealing cover, the clamping table is positioned at the bottom of the sealing cover, and the clamping table is clamped in the clamping space.

3. The battery cover plate assembly of claim 2, wherein the clamping platform is an annular clamping platform, and the stopping portion is an annular stopping portion, and the annular stopping portion abuts or abuts against the annular clamping platform.

4. The battery cover plate assembly of claim 2, wherein an end of the stop portion adjacent to the center of the first groove is provided with a guide structure.

5. The battery cover plate assembly of claim 1, wherein a sealing element is arranged between the cover and the bottom of the first groove, and a vent hole communicated with the liquid injection hole is formed in the sealing element; the seal cover is concavely provided with a blasting groove along the axis direction of the seal cover, and the blasting groove is annularly arranged.

6. The battery cover plate assembly of claim 5, wherein a second groove is concavely arranged on one side surface of the sealing cover facing the liquid injection hole, the sealing element is clamped between the groove bottom of the first groove and the groove bottom of the second groove, and the peripheral side surface of the sealing element is attached to or abutted against the groove wall of the second groove.

7. The battery cover plate assembly of claim 6, wherein the thickness of the seal is greater than the depth of the second groove.

8. The battery cover plate component of claim 6, wherein a side surface of the sealing element, which is attached to the bottom of the first groove, is provided with a second sealing part along the outer circumference of the vent hole in an annular protruding manner, and the outer circumferential side wall of the second sealing part is attached to or abutted against the hole wall of the liquid injection hole.

9. The battery cover plate assembly of claim 6, wherein the rupture groove is an annular groove having an inner circumference with a size greater than that of the vent hole, and a side of the seal adjacent to a bottom of the second groove is recessed with a third groove having a size greater than that of the vent hole.

10. The battery cover plate assembly of claim 9, wherein a side of the seal away from the bottom of the first groove is concavely provided with a plurality of fourth grooves, and the plurality of fourth grooves are arranged around the periphery of the vent hole, and the notch of the fourth groove faces the blast groove.

11. The battery cover plate assembly of claim 9, wherein the annular groove has a depth H1, the groove bottom of the second groove is at a distance H2 from the end face of the closure facing away from the battery interior, H1=0.2h2-0.5h2, and the annular groove has a width W, W =0.5h1-1.5h1.

12. The battery cover plate assembly of any one of claims 1 to 11, wherein an explosion-proof hole is formed in a side surface of the sealing cover, which faces away from the liquid injection hole, and a waterproof vent valve is arranged in the explosion-proof hole.

13. A battery comprising a casing and a battery cell disposed in the casing, wherein the casing has an opening, and the battery further comprises the cover plate assembly according to any one of claims 1 to 12, and the cover plate assembly blocks the opening.