Cover plate assembly and single battery

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a single battery. The cover plate assembly comprises a cover plate and an anti-explosion valve; the cover plate comprises a cover plate body and a fence part; the cover plate body is provided with an anti-explosion through hole, and the anti-explosion valve is arranged in the anti-explosion through hole; and the enclosure part surrounds the explosion-proof through hole and is convexly arranged on one side, facing the electrode assembly, of the cover plate body. The single battery comprises the cover plate assembly. According to the cover plate assembly and the single battery, the enclosure part is arranged on the periphery of the anti-explosion through hole, and when the single battery to which the cover plate assembly belongs is inversely used, the enclosure part prevents electrolyte from flowing towards the anti-explosion valve at the anti-explosion through hole, so that the anti-explosion valve is prevented from being soaked and corroded by the electrolyte, and the anti-explosion valve can work at the preset explosion starting pressure; and the use safety of the cover plate assembly and the single battery is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cover plate assembly and a single cell. Background Art

[0002] In order to increase the energy density of the power battery pack, the requirement to install the battery inverted is proposed from the perspective of optimizing the battery layout.

[0003] However, when the battery is inverted, the electrolyte inside the battery will gather on the battery top cover under the action of gravity, and then flow to the explosion-proof valve. Therefore, when the battery is inverted, the explosion-proof valve is very likely to be immersed in the electrolyte for a long time, causing corrosion, which in turn affects the explosion pressure of the explosion-proof valve and endangers the safety performance of the battery. Utility Model Content

[0004] The purpose of the present application is to provide a cover plate assembly and a single battery, so as to solve to a certain extent the technical problem in the prior art that when the battery is used upside down, the explosion-proof valve is easily immersed in the electrolyte and corroded, causing the explosion pressure of the explosion-proof valve to be affected.

[0005] The present application provides a cover plate assembly, including a cover plate and an explosion-proof valve;

[0006] The cover plate comprises a cover plate body and a blocking portion;

[0007] The cover plate body is provided with an explosion-proof through hole, and the explosion-proof valve is arranged in the explosion-proof through hole;

[0008] The enclosure portion surrounds the explosion-proof through hole and is convexly disposed on a side of the cover plate body facing the electrode assembly.

[0009] In the above technical solution, further, the explosion-proof through hole is stepped, and the explosion-proof through hole includes a large diameter portion and a small diameter portion, the large diameter portion passes through the side of the cover plate body facing the electrode assembly, and the explosion-proof valve is welded to the cover plate body in the large diameter portion;

[0010] The outer edge of the large diameter portion is spaced apart from the surrounding portion by a first predetermined distance.

[0011] In any of the above technical solutions, further, the first predetermined distance is a, 2mm≤a≤5mm.

[0012] In any of the above technical solutions, further, the enclosure portion protrudes by a predetermined height relative to a side of the cover plate body facing the electrode assembly, and the predetermined height is b, 1mm≤b≤5mm.

[0013] In any of the above technical solutions, further, the cover plate assembly also includes an insulating support plate, and the insulating support plate is arranged on the cover plate body;

[0014] The insulating support plate forms a limited position convex portion, and the limited position convex portion abuts against the electrode assembly;

[0015] The limiting convex part and the cover plate body enclose a cavity, the enclosing part and the explosion-proof valve are both arranged in the cavity, and the limiting convex part is provided with a vent hole connected with the cavity.

[0016] In any of the above technical solutions, further, along the extension direction of the plate surface of the cover plate body, the wall surface facing the blocking portion and the limiting protrusion is separated by a second predetermined distance.

[0017] In any of the above technical solutions, further, the second predetermined distance is c, c≥1mm.

[0018] In any of the above technical solutions, further, the cover plate body is provided with a reinforcement structure, and the reinforcement structure is arranged around the explosion-proof through hole.

[0019] In any of the above technical solutions, further, the reinforcement structure includes reinforcement ribs and / or reinforcement grooves.

[0020] The present application also provides a single cell battery, comprising the cover plate assembly described in any of the above technical solutions.

[0021] Compared with the prior art, the beneficial effects of this application are:

[0022] The cover plate assembly provided in the present application includes a cover plate and an explosion-proof valve. The cover plate includes a cover plate body and a blocking portion arranged around the explosion-proof through hole on the cover plate body, and the explosion-proof valve is arranged in the explosion-proof through hole. When the single battery to which the cover plate assembly belongs is used inverted, the electrolyte will gather on the surface of the side of the cover plate body facing the electrode assembly under the action of gravity, and will spread from the periphery of the explosion-proof through hole to the explosion-proof through hole. By arranging the blocking portion on the periphery of the explosion-proof through hole, the blocking portion prevents the electrolyte from flowing to the explosion-proof valve at the explosion-proof through hole, ensuring that the explosion-proof valve will not be soaked and corroded by the electrolyte, thereby ensuring that the explosion-proof valve can work at a preset detonation pressure, thereby improving the safety of the cover plate assembly and the single battery.

[0023] The single cell provided in the present application includes the above-mentioned cover plate assembly, and thus can achieve all the beneficial effects of the cover plate assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the structure of the cover plate assembly provided in Example 1 of the present application;

[0026] Figure 2 for Figure 1 Section view at section AA;

[0027] Figure 3 for Figure 2 A local enlarged view at point B;

[0028] Figure 4 This is a schematic structural diagram of the cover body of the cover assembly provided in Example 1 of the present application.

[0029] Reference numerals:

[0030] 1-cover assembly; 10-cover; 100-cover body; 1000-explosion-proof through hole; 101-enclosing part; 11-explosion-proof valve; 12-insulating support plate; 120-limiting convex part; 121-cavity; 122-vent. DETAILED DESCRIPTION

[0031] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Embodiment 1

[0035] See also Figures 1 to 4 As shown, an embodiment of the present application provides a cap assembly 1 for a single cell. Specifically, the single cell includes a shell, a cap assembly 1 and an electrode assembly, wherein the shell is provided with a receiving cavity and one end is open, the electrode assembly is provided in the shell, and the cap assembly 1 is sealed to the end opening of the shell.

[0036] In an optional solution of this embodiment, the cover plate assembly 1 includes a cover plate 10 and an explosion-proof valve 11 .

[0037] The cover plate 10 includes a cover plate body 100 and a blocking portion 101, wherein the cover plate body 100 can be configured as the same structure as an existing battery top cover. The cover plate body 100 is provided with an explosion-proof through hole 1000, which can be arranged in the middle of the length direction of the cover plate body 100, and the explosion-proof valve 11 is arranged in the explosion-proof through hole 1000, and the explosion-proof valve 11 can be laser welded on the cover plate body 100 corresponding to the explosion-proof through hole 1000, so as to block the explosion-proof through hole 1000 through the explosion-proof valve 11.

[0038] Optionally, the explosion-proof through hole 1000 is a stepped hole, which includes a large-diameter hole and a small-diameter hole that are interconnected, and the explosion-proof valve 11 is welded to the cover plate body 100 in the large-diameter hole.

[0039] Therefore, when a single cell battery short-circuit and loses control, a violent reaction will occur inside the single cell battery to produce chemical gas, causing the internal pressure of the single cell battery to increase until the internal pressure reaches the detonation pressure of the explosion-proof valve 11. The explosion-proof valve 11 will explode, thereby opening the explosion-proof through hole 1000 of the cover, allowing the internal gas to be released through the explosion-proof through hole 1000, thereby reducing the internal pressure of the single cell battery, thereby effectively shortening the out-of-control time of the single cell battery and protecting the safety of the single cell battery.

[0040] The enclosure portion 101 surrounds the explosion-proof through hole 1000 and is protruded on the side of the cover body 100 facing the electrode assembly. In other words, the enclosure portion 101 is arranged on the side of the cover body 100 facing the electrode assembly, and the enclosure portion 101 is in a ring shape surrounding the explosion-proof through hole 1000, so that the explosion-proof through hole 1000 and the explosion-proof valve 11 are enclosed by the enclosure portion 101.

[0041] Therefore, when the single battery to which the cover plate assembly 1 belongs is used inverted, the electrolyte will gather on the surface of the cover plate body 100 facing the electrode assembly under the action of gravity, and will spread from the periphery of the explosion-proof through hole 1000 to the explosion-proof through hole 1000. By providing an enclosure 101 on the periphery of the explosion-proof through hole 1000, the enclosure 101 prevents the electrolyte from flowing to the explosion-proof valve 11 at the explosion-proof through hole 1000, thereby ensuring that the explosion-proof valve 11 will not be soaked and corroded by the electrolyte, and further ensuring that the explosion-proof valve 11 can work at a preset detonation pressure, thereby improving the safety of the cover plate assembly 1 and the single battery.

[0042] It is worth explaining that, in general, the electrode assembly will absorb most of the electrolyte, and only a small amount of electrolyte will drip onto the cover plate 10 to form liquid accumulation. During the liquid accumulation process, the electrolyte will gather at the lowest point of the cover plate body 100 under the action of gravity, and then spread from the lowest point to a higher position. However, the explosion-proof through hole 1000 and the explosion-proof valve 11 are usually located at a higher position of the cover plate body 100, so there is no situation where the electrolyte directly flows onto the explosion-proof valve 11, but rather presents a flow state that spreads from the periphery of the explosion-proof through hole 1000 to the explosion-proof through hole 1000 and the explosion-proof valve 11.

[0043] Optionally, the enclosure portion 101 and the cover plate body 100 are integrally formed, or the enclosure portion 101 is welded to the cover plate body 100, which is not limited here.

[0044] In an optional scheme of this embodiment, the explosion-proof through hole 1000 is stepped, and the explosion-proof through hole includes a large diameter portion and a small diameter portion. The large diameter portion passes through the side of the cover body 100 facing the electrode assembly, and the small diameter portion passes through the side of the cover body 100 away from the electrode assembly. The explosion-proof valve 11 is welded to the cover body 100 in the large diameter portion, that is, the explosion-proof valve 11 is arranged in the large diameter portion and welded to the cover body 100 in the large diameter portion.

[0045] The outer edge of the large diameter portion of the explosion-proof through hole 1000 is separated from the enclosure 101 by a first predetermined distance, and the welding position of the explosion-proof valve 11 and the cover body 100 is usually close to the outer edge of the explosion-proof through hole 1000, so that the weld position of the explosion-proof valve 11 can be separated from the enclosure 101 by a first predetermined distance.

[0046] In this embodiment, the first predetermined distance is a, 2mm≤a≤5mm, for example, the first predetermined distance a is 2mm, 3mm, 4mm or 5mm.

[0047] By configuring the first predetermined distance a to be no less than 2 mm, it is ensured that the first predetermined distance a can provide sufficient space for welding the explosion-proof valve 11 and the cover body 100, thereby improving the convenience of welding the explosion-proof valve 11. By configuring the first predetermined distance to be no more than 5 mm, it is beneficial to improve the space utilization rate of the cover body 100, and avoid wasting the space of the cover body 100 due to the first predetermined distance a being too large.

[0048] In an optional scheme of this embodiment, the enclosure 101 protrudes by a predetermined height b relative to the side of the cover body 100 facing the electrode assembly, 1mm≤b≤5mm. That is to say, the enclosure 101 protrudes relative to the cover body 100, and the protruding height of the enclosure 101 is the predetermined height b, b is, for example, 1mm, 2mm, 3mm, 4mm or 5mm, and the liquid blocking function of the enclosure 101 is realized by configuring the predetermined height b.

[0049] By configuring the predetermined height b to be no less than 1 mm, it is ensured that the enclosure 101 is high enough to achieve reliable liquid blocking. By configuring the predetermined height b to be no more than 5 mm, it is beneficial to save materials, thereby taking into account the cost.

[0050] Optionally, the shape of the enclosure 101, the shape of the explosion-proof through hole 1000 and the shape of the explosion-proof valve 11 are all runway-shaped. Of course, the three can also be configured in other shapes respectively.

[0051] In an optional solution of this embodiment, the cover assembly 1 further includes an insulating support plate 12, which is disposed on the cover body 100, so that when the cover assembly 1 is assembled with the housing, the insulating support plate 12 can play an insulating connection role between the housing and the cover 10. The insulating support plate 12 is, for example, an injection molded part.

[0052] The insulating support portion forms a limiting protrusion 120, and the limiting protrusion 120 abuts against the electrode assembly. That is, the limiting protrusion 120 plays a limiting role between the cover plate 10 and the electrode assembly.

[0053] The limiting protrusion 120 and the cover body 100 enclose a cavity 121. Specifically, the limiting protrusion 120 and the side of the cover body 100 facing the electrode assembly enclose the cavity 121. The limiting protrusion 120 corresponds to the position of the explosion-proof through hole 1000, and the enclosure 101 and the explosion-proof valve 11 are both arranged in the cavity 121. That is to say, the limiting protrusion 120 covers the enclosure 101 and the explosion-proof valve 11.

[0054] The limiting convex portion 120 is provided with a vent hole 122 communicating with the cavity 121, so that the cavity 121 is connected to the inner cavity of the shell through the vent hole 122. When the single battery short-circuits out of control, the gas in the inner cavity of the shell flows into the cavity 121 through the vent hole 122 and acts on the explosion-proof valve 11, so that when the gas pressure in the inner cavity of the shell reaches the preset detonation pressure, the explosion-proof valve 11 explodes and reduces the gas pressure.

[0055] In an optional solution of this embodiment, along the extension direction of the cover body 100, the wall surface facing the enclosure portion 101 and the limiting protrusion 120 is separated by a second predetermined distance, that is, the wall surface facing the enclosure portion 101 and the limiting protrusion 120 is not arranged in a close fit, but is arranged at intervals.

[0056] Thus, a certain liquid storage buffer space is formed between the wall surface facing the enclosure portion 101 and the limiting protrusion 120, avoiding the strengthening of the "liquid creeping" effect, thereby reducing the risk of electrolyte flowing to the explosion-proof valve 11. In addition, from the perspective of assembly, the difficulty of assembling the insulating support plate 12 to the cover plate 10 can be simplified.

[0057] In this embodiment, the second predetermined distance is c, c≥1 mm, for example, c is 1 mm, 2 mm or 3 mm.

[0058] By configuring the second predetermined distance c to be no less than 1 mm, it can be ensured that the wall surface facing the enclosure portion 101 and the limiting protrusion 120 not only produces a gap during the assembly stage, but also reserves a certain shrinkage margin for the use stage, which is conducive to maintaining the gap.

[0059] In an optional solution of this embodiment, the cover body 100 is also provided with a reinforcement structure, and the reinforcement structure is arranged around the explosion-proof through hole 1000. Specifically, the reinforcement structure is arranged in the area where the explosion-proof through hole 1000 is arranged on the cover body 100, so that the structural strength of the cover body 100 adjacent to the explosion-proof through hole 1000 is strengthened by the reinforcement structure.

[0060] When the single battery is used upside down, the cover plate 10 is more likely to vibrate, affecting the structural performance and explosion pressure of the explosion-proof valve 11. Therefore, by providing a reinforcement structure, the vibration of the cover plate 10 can be reduced, which is conducive to maintaining the original structural performance and explosion pressure of the explosion-proof valve 11 when the single battery is used upside down.

[0061] In this embodiment, the reinforcement structure includes at least one of a reinforcement rib and a reinforcement groove, that is, only a reinforcement rib, only a reinforcement groove, or both a reinforcement rib and a reinforcement groove can be formed on the cover assembly 1, so that the structural strength of the cover body 100 at the explosion-proof through hole 1000 can be strengthened.

[0062] Embodiment 2

[0063] Embodiment 2 provides a single cell battery, which includes the cover plate assembly in Embodiment 1. The technical features of the cover plate assembly disclosed in Embodiment 1 are also applicable to this embodiment, and the technical features of the cover plate assembly disclosed in Embodiment 1 will not be described repeatedly.

[0064] The single cell provided in this embodiment includes a cover plate assembly 1. By adopting the cover plate assembly 1 with a blocking portion 101, the single cell is suitable for inverted use, which can effectively prevent the explosion-proof valve 11 from being soaked and corroded by the electrolyte.

[0065] The single cell in this embodiment has the advantages of the cover plate assembly in the first embodiment, and the advantages of the cover plate assembly disclosed in the first embodiment will not be described again here.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit them; although the utility model is described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some or all of the technical features therein by equivalent; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the various embodiments of the utility model. In addition, those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments instead of other features, the combination of features of different embodiments means that they are within the scope of the utility model and form different embodiments. For example, any one of the embodiments claimed for protection can be used in any combination. The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the utility model, and should not be regarded as an admission or in any form of implication that the information constitutes prior art known to those skilled in the art.

Claims

1. A cover plate assembly, characterized in that: Including cover plate and explosion-proof valve; The cover plate comprises a cover plate body and a blocking portion; The cover plate body is provided with an explosion-proof through hole, and the explosion-proof valve is arranged in the explosion-proof through hole; The enclosure portion surrounds the explosion-proof through hole and is convexly disposed on a side of the cover plate body facing the electrode assembly.

2. The cover plate assembly according to claim 1, characterized in that: The explosion-proof through hole is stepped, and includes a large diameter portion and a small diameter portion, the large diameter portion passes through the side of the cover plate body facing the electrode assembly, and the explosion-proof valve is welded to the cover plate body in the large diameter portion; The outer edge of the large diameter portion is spaced apart from the surrounding portion by a first predetermined distance.

3. The cover plate assembly according to claim 2, characterized in that: The first predetermined distance is a, 2mm≤a≤5mm.

4. The cover plate assembly according to claim 1, characterized in that: The enclosure portion protrudes by a predetermined height relative to a side of the cover plate body facing the electrode assembly, and the predetermined height is b, 1mm≤b≤5mm.

5. The cover plate assembly according to claim 1, characterized in that: It also includes an insulating support plate, wherein the insulating support plate is arranged on the cover plate body; The insulating support plate forms a limited position convex portion, and the limited position convex portion abuts against the electrode assembly; The limiting convex part and the cover plate body enclose a cavity, the enclosing part and the explosion-proof valve are both arranged in the cavity, and the limiting convex part is provided with a vent hole connected with the cavity.

6. The cover plate assembly according to claim 5, characterized in that: Along the extension direction of the plate surface of the cover plate body, the wall surface facing the blocking portion and the limiting protrusion is separated by a second predetermined distance.

7. The cover plate assembly according to claim 6, characterized in that: The second predetermined distance is c, where c≥1 mm.

8. The cover plate assembly according to claim 1, characterized in that: The cover plate body is provided with a reinforcement structure, and the reinforcement structure is arranged around the explosion-proof through hole.

9. The cover plate assembly according to claim 8, characterized in that: The reinforcement structure includes reinforcement ribs and / or reinforcement grooves.

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

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