Cover plate assembly and battery

Abstract

The utility model provides a cover plate assembly and a battery, relates to the technical field of battery accessories, and aims to optimize the structure of a battery cover plate to a certain extent, improve the pressure relief capability of the battery and ensure the use stability and safety of the battery. The utility model provides a cover plate assembly which comprises a cover plate, a sealing piece and a limiting cap. A liquid injection hole is formed in the cover plate, the sealing piece comprises an insertion part, and the insertion part is inserted into the liquid injection hole and is in sealed connection with the liquid injection hole; the limiting cap and the cover plate are connected to form a limiting space, the sealing piece is located in the limiting space, and pressure in the battery can push the insertion part to move in the direction away from the liquid injection hole, so that the sealing piece moves in the limiting space to open the liquid injection hole.

Description

Technical Field

[0001] The utility model relates to the technical field of battery accessories, in particular to a cover plate assembly and a battery. Background Art

[0002] The explosion-proof valve can release pressure in time when the battery is in thermal runaway, thus avoiding battery explosion and potential safety hazards to a certain extent. However, in some usage scenarios, the pressure generated in the battery does not reach the lower limit of the explosion-proof valve opening, resulting in failure to release pressure. As the battery is used, it will swell until thermal runaway occurs, affecting the battery's service life.

[0003] Therefore, there is an urgent need to provide a cover plate assembly and a battery to solve the problems existing in the prior art to a certain extent. Utility Model Content

[0004] The utility model aims to provide a cover plate assembly, so as to optimize the battery cover plate structure to a certain extent, improve the pressure relief capacity of the battery, and ensure the stability and safety of the battery in use.

[0005] The utility model provides a cover plate assembly, comprising a cover plate, a sealing member and a limiting cap; a liquid injection hole is formed on the cover plate, and the sealing member comprises an inserting portion, the inserting portion is inserted into the liquid injection hole and is sealed and connected with the liquid injection hole; the limiting cap is connected with the cover plate to form a limiting space, and the sealing member is located in the limiting space, and the pressure in the battery can push the inserting portion to move in a direction away from the liquid injection hole, so that the sealing member moves in the limiting space to open the liquid injection hole.

[0006] The inserting portion is tapered, and the maximum diameter of the tapered inserting portion is greater than or equal to the diameter of the injection hole.

[0007] Specifically, the angle between the inclined surface of the tapered insertion portion and the horizontal plane is in the range of 100°-145°.

[0008] Specifically, the sealing member further comprises an abutment portion, one end of the insertion portion is connected to the abutment portion, the abutment portion is in a cylindrical structure, and the diameter of the abutment portion is greater than or equal to the maximum diameter of the insertion portion.

[0009] Furthermore, a guide portion is formed on the edge of the injection hole, the guide portion has an inclined guide surface, and the inner diameter of the guide portion is matched with the maximum diameter of the insertion portion.

[0010] Wherein, the cover plate is formed with a receiving groove at a position corresponding to the injection hole, and the limiting cap is embedded in the receiving groove.

[0011] Specifically, an exhaust hole is formed on the limiting cap, and the exhaust hole penetrates the limiting cap along the thickness of the limiting cap, so that the limiting space is connected with the outside.

[0012] Furthermore, there are a plurality of exhaust holes, and the plurality of exhaust holes are evenly distributed along the circumference of the limiting cap.

[0013] Furthermore, the material of the sealing element is elastic and resistant to corrosion by electrolyte.

[0014] Compared with the prior art, the cover plate assembly provided by the utility model has the following advantages:

[0015] The cover plate assembly provided by the utility model comprises a cover plate, a sealing member and a limiting cap; a liquid injection hole is formed on the cover plate, and the sealing member comprises an inserting portion, the inserting portion is inserted into the liquid injection hole, and is sealed and connected with the liquid injection hole; the limiting cap is connected with the cover plate to form a limiting space, and the sealing member is located in the limiting space, and the pressure in the battery can push the inserting portion to move in a direction away from the liquid injection hole, so that the sealing member moves in the limiting space to open the liquid injection hole.

[0016] From this analysis, it can be seen that the present application utilizes the injection hole formed on the cover plate to achieve both the injection function and the pressure relief function. In order to prevent leakage from the injection hole, the present application sets a limit cap on the cover plate to form a limit space in cooperation with the cover plate, and sets a seal in the fiber space, and the seal includes an inserting portion that can be inserted into the injection hole, so that the injection hole can be sealed by the inserting portion.

[0017] When the pressure in the battery reaches a certain level, the gas will enter the injection hole. As the pressure continues to rise, the gas will push the insertion part, so that the insertion part can move away from the injection hole, thereby creating a gap in the injection hole, achieving the purpose of gas leakage inside the battery. After the gas leaks out, the insertion part loses the pushing effect of the pressure, and is inserted into the injection hole again under the action of the limit cap, thus achieving the sealing of the injection hole.

[0018] In addition, the utility model also provides a battery, including a shell, a battery cell and the above-mentioned cover plate assembly, the battery cell is arranged in the shell, and the cover plate assembly is used to seal the shell.

[0019] The battery using the cover assembly provided in the present application can not only meet the functions of liquid injection and subsequent liquid replenishment, but also can achieve the closure of the liquid injection hole through the seal, and when the internal pressure of the battery reaches a certain value, the seal can be pushed open to achieve pressure relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the overall structure of the cover plate assembly provided in an embodiment of the utility model;

[0022] Figure 2 A partial exploded schematic diagram of a cover plate assembly provided in an embodiment of the utility model;

[0023] Figure 3 A schematic diagram of the structure of the inserting portion of the cover plate assembly provided by the embodiment of the utility model being inserted into the liquid injection hole;

[0024] Figure 4 A schematic diagram of the structure of a sealing member in a cover plate assembly provided in an embodiment of the utility model;

[0025] Figure 5 A schematic diagram of the structure of the limiting cap of the cover plate assembly provided in an embodiment of the utility model;

[0026] Figure 6 A structural schematic diagram of a first implementation mode of the end of a sealing member in a cover plate assembly provided in an embodiment of the utility model;

[0027] Figure 7 A schematic structural diagram of a second implementation manner of the end of a sealing member in a cover plate assembly provided in an embodiment of the utility model.

[0028] In the figure: 1-cover plate; 101-liquid injection hole; 102-guide part; 103-accommodating groove; 104-explosion-proof valve; 2-limiting cap; 201-exhaust hole; 3-sealing member; 301-insertion part; 3011-inclined surface; 302-abutment part; 3021-recessed part; 3022-annular groove part. DETAILED DESCRIPTION

[0029] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0030] In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply 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 a limitation on the utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the embodiments of the present application, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting", "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 connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0034] For ease of description, spatial relative terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the drawings. Such spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the drawings.

[0035] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0036] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0037] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be considered that the combination of such technical solutions does not exist and is not within the scope of protection required by the present application.

[0038] like Figure 1 Combination Figure 2 As shown, the utility model provides a cover plate 1 assembly, including a cover plate 1, a sealing member 3 and a limiting cap 2; a liquid injection hole 101 is formed on the cover plate 1, and the sealing member 3 includes an inserting portion 301, the inserting portion 301 is inserted into the liquid injection hole 101, and is sealed and connected to the liquid injection hole 101; the limiting cap 2 is connected to the cover plate 1 to form a limiting space, and the sealing member 3 is located in the limiting space, and the pressure in the battery can push the inserting portion 301 to move in a direction away from the liquid injection hole 101, so that the sealing member 3 moves in the limiting space to open the liquid injection hole 101.

[0039] Compared with the prior art, the cover plate 1 assembly provided by the utility model has the following advantages:

[0040] The cover plate 1 assembly provided by the utility model can realize both the function of liquid injection and the function of pressure relief by utilizing the injection hole 101 formed on the cover plate 1. In order to prevent the liquid injection hole 101 from leaking, the present application sets a limiting cap 2 on the cover plate 1 so as to form a limiting space in cooperation with the cover plate 1, and sets a sealing member 3 in the fiber space, and the sealing member 3 includes an inserting portion 301 that can be inserted into the liquid injection hole 101, so that the liquid injection hole 101 can be sealed by the inserting portion 301.

[0041] When the pressure in the battery reaches a certain level, the gas will enter the injection hole 101. As the pressure continues to increase, the gas will push the insertion part 301, so that the insertion part 301 can move away from the injection hole 101, thereby creating a gap in the injection hole 101, so that the gas inside the battery can be released. After the gas is released, the insertion part 301 loses the driving effect of the pressure, and is inserted into the injection hole 101 again under the action of the limiting cap 2, so that the injection hole 101 is sealed.

[0042] Alternatively, if Figure 2 Combination Figure 3 As shown, the insertion portion 301 in the present application is tapered, and the maximum diameter of the tapered insertion portion 301 is greater than or equal to the diameter of the injection hole 101 .

[0043] The tapered insertion portion 301 can make the process of inserting into the injection hole 101 smoother, and since the diameter of the insertion portion 301 gradually increases from the end away from the abutment portion 302 to the end close to the abutment portion 302, while the diameter of the injection hole 101 always remains consistent, when the pressure in the battery pushes the insertion portion 301 open a certain distance, a pressure relief gap can be generated between the insertion portion 301 and the injection hole 101, so that the gas in the battery is discharged from the pressure relief gap, thereby realizing the pressure relief function.

[0044] It should be noted here that, since the minimum pressure relief value of the explosion-proof valve 104 is 0.4Mpa at this stage, the cover plate 1 assembly provided in the present application mainly uses the injection hole 101 to perform pressure relief operations below 0.4Mpa, that is, when the pressure in the battery has not reached the pressure relief value of the explosion-proof valve 104, the pressure can be discharged through the injection hole 101. On the one hand, it can avoid excessive accumulation of pressure to trigger the explosion-proof valve 104. On the other hand, when the pressure reaches the pressure relief value of the explosion-proof valve 104, auxiliary pressure relief can still be achieved through the injection hole 101, thereby ensuring the stability and safety of battery use to a certain extent.

[0045] Preferably, the angle between the inclined surface 3011 of the tapered insertion portion 301 in the present application and the horizontal plane is in the range of 100°-145°.

[0046] Alternatively, if Figure 2-Figure 4As shown, the seal 3 in the present application further includes an abutment portion 302 , one end of the insertion portion 301 is connected to the abutment portion 302 , the abutment portion 302 is a cylindrical structure, and the diameter of the abutment portion 302 is greater than or equal to the maximum diameter of the insertion portion 301 .

[0047] The large diameter end of the insertion part 301 in the present application is connected to the abutment part 302 , and the insertion part 301 and the abutment part 302 are coaxially arranged, thereby ensuring that the force of the entire sealing component 3 is uniform and avoiding the deviation problem.

[0048] The abutment portion 302 in the present application has a cylindrical structure and can stably block the injection hole 101 , and can have a sufficient contact area with the limiting cap 2 to ensure the stable movement of the sealing member 3 and the sealing degree of the injection hole 101 .

[0049] It should be noted that, in order to ensure that the insertion portion 301 of the seal 3 can smoothly move away from the injection hole 101 and return to the state of blocking the injection hole 101 after the pressure in the battery is lost, Figure 6 Combination Figure 7 As shown, the abutment portion 302 in the present application has two implementations, one of which is as follows Figure 5 As shown, a concave portion 3021 is formed at one end of the abutting portion 302 away from the inserting portion 301, so that a weak area can be formed at the edge of the end of the abutting portion 302 away from the inserting portion 301, and then when the pressure inside the battery pushes the inserting portion 301, the weak area can be quickly deformed, so that the inserting portion 301 can move in a direction away from the injection hole 101. In addition, the formed concave portion 3021 can provide sufficient space for the deformation of the weak area.

[0050] Accordingly, Figure 7 Another embodiment is shown in the figure, that is, a plurality of annular grooves 3022 are formed at one end of the abutment portion 302 away from the insertion portion 301. The annular grooves 3022 formed can also provide sufficient deformation space, so that the end of the abutment portion 302 away from the insertion portion 301 is more likely to deform, thereby ensuring the movement of the insertion portion 301 and achieving pressure relief.

[0051] Alternatively, if Figure 2 Combination Figure 3 As shown, a guide portion 102 is formed at the edge of the injection hole 101 in the present application. The guide portion 102 has an inclined guide surface, and the inner diameter of the guide portion 102 is adapted to the maximum diameter of the insertion portion 301 .

[0052] The formed guide portion 102 can make the insertion process of the insertion portion 301 smoother, and the inner diameter of the guide portion 102 refers to the diameter of the connection position between the guide portion 102 and the injection hole 101. Accordingly, the inner diameter of the guide portion 102 in the present application is adapted to the maximum diameter of the insertion portion 301, which means that the diameter of the connection position between the guide portion 102 and the injection hole 101 in the present application is slightly smaller than or equal to the maximum diameter of the insertion portion 301. Therefore, when the insertion portion 301 is inserted into the injection hole 101, a certain degree of interference fit can be formed with the guide portion 102, which can ensure the sealing degree without making the interference fit area too large, resulting in the problem that the insertion portion 301 cannot be separated from the injection hole 101, thereby ensuring smooth pressure relief.

[0053] Alternatively, if Figure 1 As shown, the cover plate 1 in the present application is formed with a receiving groove 103 at a position corresponding to the injection hole 101 , and the limiting cap 2 is embedded in the receiving groove 103 .

[0054] The accommodating groove 103 formed on the cover plate 1 can be used to position the limiting cap 2 to prevent the limiting cap 2 from moving and causing the sealing member 3 to separate from the injection hole 101 .

[0055] Preferably, if Figure 5 As shown, an exhaust hole 201 is formed on the limiting cap 2 in the present application, and the exhaust hole 201 penetrates the limiting cap 2 along the thickness of the limiting cap 2, so that the limiting space is connected with the outside.

[0056] The exhaust hole 201 can be formed to connect the limited space with the outside. When the pressure in the battery is released from the injection hole 101, it can reach the outside through the exhaust hole 201, so that the seal 3 can always achieve the function of being pressurized and moving.

[0057] More preferably, if Figure 5 As shown, there are multiple exhaust holes 201 in the present application, and the multiple exhaust holes 201 are evenly distributed along the circumference of the limiting cap 2.

[0058] The multiple exhaust holes 201 formed can quickly release the depressurized gas, and the exhaust holes 201 are evenly distributed along the circumference of the limiting cap 2 so that the force on the limiting cap 2 can be more uniform, thereby avoiding the problem of deviation.

[0059] It can be understood that the material of the sealing member 3 in the present application is a material that is elastic and resistant to corrosion by electrolyte.

[0060] In addition, the utility model also provides a battery, including a shell, a battery cell and the above-mentioned cover plate 1 assembly, the battery cell is arranged in the shell, and the cover plate 1 assembly is used to seal the shell.

[0061] The battery using the cover plate 1 assembly provided in the present application can not only meet the functions of liquid injection and subsequent liquid replenishment, but also can achieve the closure of the liquid injection hole 101 through the seal 3, and when the internal pressure of the battery reaches a certain value, the seal 3 can be pushed open to achieve pressure relief.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cover plate assembly, characterized in that: It comprises a cover plate (1), a sealing member (3) and a limiting cap (2); A liquid injection hole (101) is formed on the cover plate (1), and the sealing member (3) comprises an inserting portion (301), wherein the inserting portion (301) is inserted into the liquid injection hole (101) and is sealed and connected to the liquid injection hole (101); The limiting cap (2) is connected to the cover plate (1) to form a limiting space, and the sealing member (3) is located in the limiting space. The pressure in the battery can push the insertion portion (301) to move in a direction away from the injection hole (101), so that the sealing member (3) moves in the limiting space to open the injection hole (101).

2. The cover plate assembly according to claim 1, characterized in that: The insertion portion (301) is tapered, and the maximum diameter of the tapered insertion portion (301) is greater than or equal to the diameter of the liquid injection hole (101).

3. The cover plate assembly according to claim 2, characterized in that: The angle between the inclined surface (3011) of the tapered insertion portion (301) and the horizontal plane is in the range of 100°-145°.

4. The cover plate assembly according to claim 2, characterized in that: The sealing member (3) further comprises an abutment portion (302), one end of the insertion portion (301) being connected to the abutment portion (302), the abutment portion (302) being in a cylindrical structure, and the diameter of the abutment portion (302) being greater than or equal to the maximum diameter of the insertion portion (301).

5. The cover plate assembly according to claim 4, characterized in that: A guide portion (102) is formed on the edge of the injection hole (101), and the guide portion (102) has an inclined guide surface. The inner diameter of the guide portion (102) is matched with the maximum diameter of the insertion portion (301).

6. The cover plate assembly according to claim 1, characterized in that: The cover plate (1) is formed with a receiving groove (103) at a position corresponding to the liquid injection hole (101), and the limiting cap (2) is embedded in the receiving groove (103).

7. The cover plate assembly according to claim 1, characterized in that: An exhaust hole (201) is formed on the limiting cap (2), and the exhaust hole (201) penetrates the limiting cap (2) along the thickness of the limiting cap (2), so that the limiting space is connected with the outside.

8. The cover plate assembly according to claim 7, characterized in that: There are a plurality of exhaust holes (201), and the plurality of exhaust holes (201) are evenly distributed along the circumference of the limiting cap (2).

9. The cover plate assembly according to claim 1, characterized in that: The material of the sealing element (3) is elastic and resistant to corrosion by electrolyte.

10. A battery, comprising a housing, a battery cell and a cover assembly according to any one of claims 1 to 9, characterized in that: The battery core is arranged in the shell, and the cover plate assembly is used to seal the shell.

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