CN218456108U - Battery cover plate assembly and battery - Google Patents

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 assembly and battery

technical field

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

Background technique

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 sealed tightly, the battery will leak, which will not only reduce the performance of the battery, but also pose a great safety hazard. And the leaked electrolyte is also easy to corrode other parts around the battery.

At present, the commonly used sealing methods are as follows: 1. Weld the cover and the periphery of the liquid injection hole of the cover plate. This sealing method takes a long time to weld, and there may be a risk of electrolyte leakage due to lax welds; 2. 1. The rubber plug and the liquid injection hole are sealed through the interference fit. The rubber plug is easy to age during use, and it is easy to fall into the battery, pollute the electrolyte, and reduce the service life of the battery. The assembly process of the above-mentioned sealing structure is complicated, inefficient, and time-consuming. .

Utility model content

An object of the embodiments of the present invention is to provide a battery cover assembly, which has a simple structure and is easy to assemble.

Another object of the embodiments of the present invention is to provide a battery with low production cost and high safety.

For reaching this purpose, the utility model embodiment adopts following technical scheme:

In the first aspect, a battery cover plate assembly is provided, including a cover plate and a cover, a liquid injection hole is opened on the cover plate, the cover plate has a first side facing away from the inside of the battery, and the first side is recessed There is a first groove, the liquid injection hole runs through the bottom of the first groove, the groove wall of the first groove protrudes toward the center of the first groove, and a stopper is provided, and the A clamping space is formed between the stop part and the groove bottom of the first groove, the cover is arranged in the first groove, and the edge of the cover is clamped in the clamping space .

As a preferred solution of the battery cover plate assembly, the outer peripheral side wall of the cover protrudes outward toward the side away from the center of the cover, and a card platform is provided, and the card platform is located at the bottom of the cover, so The card table is clamped in the clamping space.

As a preferred solution of the battery cover assembly, the clamping platform is an annular clamping platform, the stopper is an annular stopper, and the annular stopper fits or abuts against the annular clamping platform.

As a preferred solution of the battery cover plate assembly, a guide structure is provided at one end of the stop portion adjacent to the center of the first groove.

As a preferred solution of the battery cover plate assembly, a seal is provided between the cover and the bottom of the first groove, and a vent hole communicating with the liquid injection hole is penetrating through the seal; The cover is concavely provided with blasting slots along its axis direction, and the blasting slots are arranged in a ring shape.

As a preferred solution of the battery cover assembly, a second groove is recessed on one side of the cover facing the liquid injection hole, and the sealing member is sandwiched between the bottom of the first groove and the bottom of the first groove. Between the groove bottoms of the second groove, the outer peripheral side of the seal is attached or abutted against the groove wall of the second groove.

As a preferred solution of the battery cover plate assembly, a side of the sealing member adhering to the groove bottom of the first groove is provided with a second sealing portion protruding along the outer periphery of the vent hole, and the second sealing portion The outer peripheral side wall of the liquid injection hole fits or abuts against the hole wall of the liquid injection hole.

As a preferred solution of the battery cover assembly, the thickness of the sealing member is greater than the depth of the second groove.

As a preferred solution of the battery cover plate assembly, the blasting groove is an annular groove, the size of the inner ring of the ring groove is larger than the size of the vent hole, and the groove of the sealing member is adjacent to the second groove One side of the bottom is recessed with a third groove, and the size of the third groove is larger than the size of the air hole.

As a preferred solution of the battery cover plate assembly, a side of the sealing member away from the groove bottom of the first groove is recessed with a plurality of fourth grooves, and the plurality of fourth grooves surround the The ventilation hole is arranged around the periphery, and the notch of the fourth groove faces the blasting slot.

As a preferred solution of the battery cover assembly, the depth of the annular groove is H1, the distance between the bottom of the second groove and the end surface of the cover facing away from the inside of the battery is H2, H1=0.2 H2-0.5H2, the width of the annular groove is W, W=0.5H1-1.5H1.

As a preferred solution of the battery cover plate assembly, an explosion-proof hole is opened on the side of the cover away from the liquid injection hole, and a waterproof and breathable valve is arranged in the explosion-proof hole.

In the second aspect, a battery is provided, which includes a casing and a battery cell arranged in the casing, the casing is provided with an opening, and also includes the above-mentioned battery cover assembly, and the cover assembly seals the Open your mouth.

The beneficial effects of the embodiment of the utility model are as follows: a clamping space just accommodating the cover is formed by providing a clamping groove around the liquid injection hole in the cover plate, and the injection can be realized by directly clamping the cover into the clamping space. The sealing of the liquid hole is reliable and durable, no additional welding is required, the structure is simple, easy to operate, and the assembly efficiency is high; the cover is tightly connected to the outside of the cover through the card slot of the cover, so as to seal the liquid injection hole and make it airtight Good performance, while preventing part of the structure from extending into the battery to cause pollution.

Description of drawings

The utility model will be described in further detail below according to the accompanying drawings and embodiments.

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

Fig. 2 is the sectional view of the cover plate of the utility model embodiment;

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

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

Fig. 5 is a cross-sectional view of the seal of the utility model embodiment;

Fig. 6 is a schematic structural view of the sealing member of the embodiment of the present invention.

In the picture:

1. Cover plate; 11. Liquid injection hole; 12. First groove; 13. Stopper; 131. Guide structure; 14. Clamping space; 15. First side; 16. Second side;

2. Cover; 21. Explosion-proof hole; 22. Waterproof and breathable valve; 23. Card platform; 24. Second groove; 25. Blasting groove;

3. Sealing element; 31. Air vent; 32. The third groove; 33. The second sealing part; 34. The fourth groove.

Detailed ways

In order to make the technical problem solved by the utility model, the technical scheme adopted and the technical effect achieved clearer, the technical scheme of the embodiment of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiment is only Some embodiments of the utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present utility model.

In the description of the present utility model, unless otherwise clearly stipulated and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or a Integral; it can be mechanically or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "below" a second feature may include direct contact between the first and second features, and may also include the first and second features being in direct contact with each other. The features are not in direct contact but through another feature between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

As shown in Figures 1 and 2, the battery cover assembly of the embodiment of the present invention includes a cover 1, a cover 2, and a seal 3. The cover 1 is provided with a liquid injection hole 11, and the cover 1 has a The inner first side 15 and the second side 16 opposite to the first side 15, the second side 16 is located inside the battery, the first side 15 is recessed with a first groove 12, and the liquid injection hole 11 runs through the first groove 12 The bottom of the groove, the groove wall of the first groove 12 protrudes toward the center of the first groove 12, and a stopper 13 is provided, and a clamping space 14 is formed between the stopper 13 and the groove bottom of the first groove 12, The cover 2 is set in the first groove 12, and the edge of the cover 2 is clamped in the clamping space 14; a clamping groove is provided on the side of the liquid injection hole 11 of the cover plate 1 to form a clamp that just accommodates the cover 2 Space 14, the sealing of the liquid injection hole 11 can be realized by directly snapping the cover 2 into the card slot. The plate 1 has its own buckle to tightly connect the cover 2 and the seal 3 to the outside of the cover 1, which has good airtightness and prevents part of the structure from extending to the inside of the battery to cause pollution.

Preferably, a guide structure 131 is provided at one end of the stopper 13 adjacent to the center of the first groove 12. In this embodiment, the guide structure 131 is a rounded corner of the edge of the upper end surface of the stopper 13 adjacent to the center of the liquid injection hole 11. In other embodiments, chamfers or other structures in which the end of the stop portion 13 adjacent to the liquid injection hole 11 becomes gradually smaller from the outside to the inside can also be adopted.

It can be understood that the cover 2 is clamped between the stopper 13 and the groove bottom of the first groove 12, and the common method is that the stopper 13 and the first groove 12 are preformed, and the operator clamps the cover 2 Entering the clamping space 14, in this embodiment, the stopper 13 protrudes from the first side 15 of the cover 1 and surrounds it along the first groove 12, so that the cover 2 is placed along the first groove 12. The groove wall is attached to the groove bottom of the first groove 12, and the stop portion 13 originally protruding from the first side 15 is riveted to the center of the first groove 12 by using a spin riveting process, so that the stop portion 13 and the center of the first groove 12 are formed. The cover 2 is attached so that the cover 2 is tightly pressed against the bottom of the first groove 12, so as to avoid the cover 2 from being damaged due to hard plugging, and the seal is firm. In other embodiments, heating bending or other methods can also be used. The stop portion 13 is bent by mechanical means to abut against the card table 23. The clamping space 14 used by this structure is relatively small, so the cover plate 1 is relatively thin, saving material, and the structure has good airtightness.

Preferably, as shown in FIG. 3 , the outer peripheral side wall of the cover 2 protrudes outward toward the side away from the center of the cover 2, and the card platform 23 is located at the bottom of the cover 2, which is adjacent to the bottom of the cover 2. On one side of the bottom of the first groove 12, the height of the clamping space 14 is reduced by setting the card table 23, thereby reducing the thickness of the cover plate 1, saving materials, reducing the occupied space of the battery case structure, and improving the battery cell. Space utilization. Further, in order to better make the stopper 13 abut against the card table 23, the card table 23 is set as an annular card table, which is more conducive to the sealing between the card table 23 and the bottom of the first groove 12, and is also more convenient It is attached to the stop part 13, and there is no need to deliberately specify the angle to have the card table 23, which reduces the proofreading time. The stop part 13 is an annular stop part, which prevents the stop part 13 from tilting in other directions when the stop part 13 is riveted, causing the stop part 13 The abutment with the card table 23 is not tight.

In one embodiment, a seal 3 is provided between the cover 2 and the bottom of the first groove 12, and the seal 3 is penetrated with a vent hole 31 communicating with the liquid injection hole 11; the cover 2 is concave along its axis direction. A blasting groove 25 is provided, and the blasting groove 25 is arranged in a ring shape, and the liquid injection hole 11 is sealed by the sealing structure provided with the ring-shaped blasting groove 25, so as to reduce the need to open an additional explosion-proof hole on the cover plate 1 or the battery case. Hole 21, thereby reducing one-time welding, reducing the risk of weld leakage, and improving the safety performance of the battery seal. The structure is simple and easy to assemble; the cover 2 itself is surrounded by a concave blasting groove 25 to form a weak area, which is used as an explosion-proof valve , reduce the opening of the explosion-proof hole 21 and the additional setting of the explosion-proof valve accessories in the explosion-proof hole 21, and reduce the production cost

For example, the sealing member 3 is sandwiched between the cover 2 and the bottom of the first groove 12 to strengthen the seal between the cover 2 and the cover plate 1 and prevent the electrolyte from flowing out of the connecting gap. In this embodiment, The side of the cover 2 facing the liquid injection hole 11 is recessed with a second groove 24, and the thickness of the sealing member 3 should be slightly greater than the depth of the second groove 24, so as to ensure that the two ends of the sealing member 3 are interference fit in the first groove. In the space formed by the groove bottom of the groove 12 and the groove bottom of the second groove 24, the outer peripheral side of the sealing member 3 fits or abuts against the groove wall of the second groove 24, thereby improving the seal between the sealing member 3 and the cover 2, Further, as shown in FIG. 5 , a second sealing portion 33 protrudes along the outer periphery of the vent hole 31 on one side of the sealing member 3 that fits or abuts against the groove bottom of the first groove 12 , and the outer periphery of the second sealing portion 33 The side wall fits or abuts against the hole wall of the liquid injection hole 11 , so that the space between the sealing member 3 and the cover plate 1 is more protected, and the sealing effect of the sealing member 3 is further improved.

Preferably, the blasting groove 25 is arranged on the end face of the cover 2 facing away from the inside of the battery. The blasting groove 25 is a connected annular groove, forming a controllable fracture zone. Contact with the weak fracture area to ensure that when the internal pressure of the battery reaches a set level, the cover 2 can be ruptured to complete the explosion-proof function. Further, the diameter of the inner ring of the annular groove is larger than the size of the vent hole 31, and the seal 3 A third groove 32 is provided on one side of the groove bottom that fits or abuts against the second groove 24. The size of the third groove 32 is larger than the size of the vent hole 31, and the gas generated in the battery is stored in the third groove. 32. It has a larger contact area with the weak area of the cover 2 to ensure the blasting effect. At the same time, a part of the gas can be temporarily stored in the third groove 32 to increase the internal pressure bearing capacity of the battery.

Optionally, the depth of the annular groove is H1, the distance between the bottom of the second groove 24 and the end face of the cover 2 facing away from the inside of the battery is H2, H1=0.2H2-0.5H2, and the width of the annular groove is W, W=0.5H1-1.5H1, to ensure that there is enough fracture area for the internal pressure to break through along the blast groove 25, the cross section of the annular groove can be fan-shaped, triangular, square, etc. In this embodiment, the annular groove is semicircular The cross-sectional groove is easy to process, and has balanced force, high sensitivity, and is easy to break. At the same time, the setting of the second groove 24 is also to make the thickness of the cover plate 1 thinner, which is convenient for blasting.

Preferably, as shown in FIG. 6 , a side of the seal 3 away from the groove bottom of the first groove 12 is recessed with a plurality of fourth grooves 34 , and the plurality of fourth grooves 34 surround the periphery of the air hole 31 Setting, the notch of the fourth groove 34 faces the blast groove 25, and the air pressure inside the battery is transmitted from the liquid injection hole 11 to the fourth groove 34 through the vent hole 31. Below the groove 25, the pressure directly impacts the blasting groove 25 and blasts outward, so that when the air pressure in the battery suddenly increases, the blasting groove 25 is more directly stressed, so that the regional rapid rupture is not only concentrated on the central axis of the vent hole 31, which is safe. High performance, preferably, the center of the blasting groove 25 is located on the same axis as the center of the liquid injection hole 11 and the center of the vent hole 31, which is conducive to the direct contact of the internal air pressure of the battery with the weak area formed by the blasting groove 25 of the cover 2.

Furthermore, as shown in Figure 4, the cover 2 is provided with an explosion-proof hole 21 on the side facing away from the liquid injection hole 11, and the explosion-proof hole 21 is located in the center of the explosion-proof groove 25, and a waterproof and breathable valve 22 is arranged in the explosion-proof hole 21, which can The gas inside the battery is partially decompressed to increase the air pressure bearing capacity inside the battery. Preferably, the diameter of the explosion-proof hole 21 is equal to the diameter of the inner ring of the circular blasting groove 25, thereby increasing the connection between the waterproof and breathable valve 22 and the inside of the battery. The contact area of the gas can relieve the pressure to a greater extent, and further enhance the air pressure bearing capacity in the battery. More preferably, a protective sheet is also provided in the explosion-proof hole 21, and the protective sheet is located on the gas outlet side of the waterproof and breathable valve 22. During the process, dust, other corrosion-resistant substances or external force can be prevented from damaging the waterproof and breathable valve 22, so that the waterproof and breathable valve 22 is more durable.

The utility model also provides a battery, which includes a casing and an electric core arranged in the casing. An opening is opened on the casing, and the battery cover assembly of any embodiment above is arranged at the opening. The battery cover assembly seals the opening, and the battery The specific structure of the cover plate assembly will not be described in detail. The battery of the utility model utilizes the battery cover assembly to seal the opening, and has the advantages of simple structure, convenient assembly and high production efficiency.

In the description herein, it should be understood that the orientations or positional relationships such as "upper" and "lower" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operations, rather than indicating or implying The devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the invention.

In the description of this specification, the description with reference to the term "an embodiment" means that the specific features, structures, materials or characteristics of the embodiment are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment.

In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

The technical principles of the present utility model have been described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the utility model, and cannot be construed as limiting the protection scope of the utility model in any way. Based on the explanations herein, those skilled in the art can think of other specific implementations of the present utility model without creative work, and these forms will all fall within the protection scope of the present utility model.

Claims (13)

1. A battery cover plate assembly, comprising a cover plate, a liquid injection hole is opened on the cover plate, and it is characterized in that it also includes a cover, the cover plate has a first side facing away from the inside of the battery, and the first A first groove is provided in the side depression, the liquid injection hole runs through the bottom of the first groove, and the groove wall of the first groove protrudes toward the center of the first groove to provide a stopper, In addition, a clamping space is formed between the stopper and the groove bottom of the first groove, the cover is arranged in the first groove, and the edge of the cover is clamped on the clip. hold space. 2 . The battery cover assembly according to claim 1 , wherein the outer peripheral side wall of the cover protrudes outward toward a side away from the center of the cover, and a card platform is provided, and the card platform is located at At the bottom of the cover, the card table is clamped in the clamping space. 3. The battery cover assembly according to claim 2, wherein the clamping platform is an annular clamping platform, the stopper is an annular stopper, and the annular stopper fits or abuts against The ring deck. 4 . The battery cover assembly according to claim 2 , wherein a guide structure is provided at one end of the stop portion adjacent to the center of the first groove. 5 . The battery cover assembly according to claim 1 , wherein a sealing member is provided between the cover and the bottom of the first groove, and the sealing member penetrates through and communicates with the The air hole of the liquid injection hole; the cover is concavely provided with a blasting groove along its axis direction, and the blasting groove is arranged in a ring shape. 6. The battery cover plate assembly according to claim 5, wherein a second groove is recessed on a side of the cover facing the liquid injection hole, and the sealing member is clamped on the first Between the groove bottom of the groove and the groove bottom of the second groove, the outer peripheral side of the sealing member fits or abuts against the groove wall of the second groove. 7. The battery cover assembly according to claim 6, wherein the thickness of the sealing member is greater than the depth of the second groove. 8. The battery cover assembly according to claim 6, characterized in that, one side of the sealing member adhering to the groove bottom of the first groove protrudes annularly along the outer periphery of the vent hole to provide a second seal part, the outer peripheral side wall of the second sealing part is attached or abutted against the hole wall of the liquid injection hole. 9. The battery cover assembly according to claim 6, wherein the blasting groove is an annular groove, the size of the inner circle of the ring groove is larger than the size of the vent hole, and the sealing member is adjacent to the A side of the groove bottom of the second groove is recessed and provided with a third groove, and the size of the third groove is larger than the size of the air hole. 10. The battery cover assembly according to claim 9, wherein a plurality of fourth grooves are recessed on a side of the sealing member away from the groove bottom of the first groove, and the plurality of said grooves The fourth groove is arranged around the periphery of the ventilation hole, and the notch of the fourth groove faces the blast slot. 11. The battery cover assembly according to claim 9, wherein the depth of the annular groove is H1, and the distance from the bottom of the second groove to the end surface of the cover facing away from the inside of the battery is The distance is H2, H1=0.2H2-0.5H2, and the width of the annular groove is W, W=0.5H1-1.5H1. 12. The battery cover assembly according to any one of claims 1 to 11, wherein an explosion-proof hole is provided on the side of the cover away from the liquid injection hole, and a waterproof and breathable valve. 13. A battery, comprising a casing and a cell disposed in the casing, the casing is provided with an opening, characterized in that it also includes the cover plate assembly according to any one of claims 1 to 12 , the cover plate assembly blocks the opening.

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