Lithium battery safety valve with dual protection

Abstract

The utility model discloses a lithium battery safety valve with dual protection, which relates to the technical field of lithium batteries, and comprises a base, a first protection component is mounted in the base, the first protection component is the first protection of the lithium battery safety valve, and the first protection component comprises a pressure relief hole and a sealing plug. A plurality of pressure relief holes are formed in the inner wall of the base in a penetrating mode, sealing plugs are installed in the pressure relief holes, and the sealing plugs are used for sealing the pressure relief holes. When the safety valve is installed and used, the sealing plug is sealed in the pressure relief hole, and when the internal pressure of the lithium battery is too large, in order to prevent the safety valve from being damaged by pressure, the sealing plug rushes out from the interior of the pressure relief hole under the pressure, so that the pressure is discharged through the pressure relief hole, and the safety valve is protected.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a lithium battery safety valve with double protection. Background Art

[0002] Lithium batteries are batteries that use lithium metal or lithium alloy as anode materials and non-aqueous electrolyte solutions. A safety valve is installed on the top of the lithium battery to prevent the sealed metal casing of the lithium battery from exploding.

[0003] Patent document CN203134886U discloses a lithium battery safety valve. "Due to the lack of a double protection structure, the battery safety valve in the patent document is prone to cause the lithium battery to explode, and the safety cannot be improved. Utility Model Content

[0004] One purpose of the present application is to provide a double-protected lithium battery safety valve to solve the technical problem that the battery safety valve proposed in the prior art lacks a double protection structure during operation, which easily causes the lithium battery to explode and the safety cannot be improved.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a double-protected lithium battery safety valve, comprising a base, a first protection component is installed inside the base, the first protection component is the first level of protection for the lithium battery safety valve, the first protection component comprises a pressure relief hole and a sealing plug, the pressure relief hole is opened through the inner wall of the base, and there are several pressure relief holes, a sealing plug is installed inside the pressure relief hole, and the sealing plug is used to close the several pressure relief holes.

[0006] Preferably, a battery positive electrode cap is installed inside the top of the base, and a second protection component is installed on the top of the battery positive electrode cap, and the second protection component is the second level of protection for the lithium battery safety valve.

[0007] Preferably, the second protection component includes a storage shell and a closing film, the storage shell is fixed inside the positive cap of the battery, the interior of the storage shell is used to store the fire extinguishing agent, the bottom of the storage shell is open, and the closing film is fixed to the bottom of the storage shell.

[0008] Preferably, the central top protrusion of the battery positive electrode cap is provided with a connecting convex surface, and a heat dissipation groove is provided on the outer side of the connecting convex surface.

[0009] Preferably, a hollow insulating gasket is installed inside the base, and an aluminum sheet is installed on the top of the hollow insulating gasket.

[0010] Preferably, an overcurrent protection sheet is installed on the top of the aluminum sheet, and the overcurrent protection sheet is located below the positive electrode cap of the battery.

[0011] Preferably, the outer sides of the hollow insulating gasket, the aluminum sheet, the overcurrent protection sheet and the battery positive electrode cap are wrapped inside the base.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. In the utility model, when the safety valve is installed and used, the sealing plug is sealed inside the pressure relief hole. When the internal pressure of the lithium battery is too large, in order to prevent the safety valve from being damaged by the pressure, the sealing plug will rush out from the inside of the pressure relief hole under pressure, so that the pressure is discharged through the pressure relief hole, thereby protecting the safety valve.

[0014] 2. In the utility model, the positive cap of the battery provides a position for installing the second protection component. If the interior of the lithium battery is too large and the safety valve is directly damaged, the fire extinguishing agent is stored inside the storage shell. Since the bottom of the storage shell is closed by a sealing membrane, the sealing membrane is damaged after being impacted, so that the internal fire extinguishing agent is sprayed onto the lithium battery to avoid fire. It is used to protect the lithium battery and make the use of the lithium battery safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional diagram of the utility model;

[0016] Figure 2 This is a schematic diagram of the base structure of the utility model;

[0017] Figure 3 For the utility model Figure 2 Schematic diagram of the structure at A in the middle;

[0018] Figure 4 The utility model is a schematic diagram of the battery positive electrode cap structure.

[0019] In the figure: 1. base; 2. pressure relief hole; 3. sealing plug; 4. hollow insulating gasket; 5. aluminum sheet; 6. overcurrent protection sheet; 7. battery positive electrode cap; 8. connecting convex surface; 9. heat dissipation groove; 10. storage shell; 11. sealing membrane. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0021] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention 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 operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 an indirect connection 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.

[0023] See also Figure 1-Figure 4 , an embodiment provided by the utility model: a lithium battery safety valve with double protection;

[0024] It includes a base 1 and a first protection component. The first protection component is installed inside the base 1. The first protection component is the first protection of the lithium battery safety valve. The first protection component includes a pressure relief hole 2 and a sealing plug 3. The pressure relief hole 2 is opened through the inner wall of the base 1, and a plurality of pressure relief holes 2 are opened. A sealing plug 3 is installed inside the pressure relief hole 2. The sealing plug 3 is used to close the plurality of pressure relief holes 2. A battery positive electrode cap 7 is installed inside the top of the base 1. A second protection component is installed on the top of the battery positive electrode cap 7. The second protection component is the second protection of the lithium battery safety valve. The second protection component includes a storage shell 10 and a closing film 11. The storage shell 10 is fixed inside the battery positive electrode cap 7. The inside of the storage shell 10 is used to store a fire extinguishing agent. The bottom of the storage shell 10 is open. The closing film 11 is fixed to the bottom of the storage shell 10.

[0025] The base 1 provides an installation position for the hollow insulating gasket 4, the aluminum sheet 5, the overcurrent protection sheet 6 and the battery positive electrode cap 7, and also provides a position for the opening of the pressure relief hole 2. When the safety valve is installed and used, the sealing plug 3 is sealed inside the pressure relief hole 2. When the internal pressure of the lithium battery is too large, in order to prevent the safety valve from being damaged by the pressure, the sealing plug 3 will rush out from the inside of the pressure relief hole 2 under pressure, so that the pressure is discharged through the pressure relief hole 2 to protect the safety valve. The battery positive electrode cap 7 plays the role of circuit connection. The battery positive electrode cap 7 provides a position for the installation of the second protection component. If the interior of the lithium battery is too large and the safety valve is directly damaged, the storage shell 10 stores fire extinguishing agent inside. Since the bottom of the storage shell 10 is closed by a sealing membrane 11, the sealing membrane 11 is damaged after being impacted, so that the internal fire extinguishing agent is sprayed onto the lithium battery to avoid fire. It is used to protect the lithium battery and make the use of the lithium battery safer.

[0026] See also Figure 1 , an embodiment provided by the utility model: a lithium battery safety valve with double protection;

[0027] The center top of the battery positive electrode cap 7 is convexly provided with a connection convex surface 8, and a heat dissipation groove 9 is provided on the outer side of the connection convex surface 8. A hollow insulating gasket 4 is installed inside the base 1, and an aluminum sheet 5 is installed on the top of the hollow insulating gasket 4. An overcurrent protection sheet 6 is installed on the top of the aluminum sheet 5. The overcurrent protection sheet 6 is located below the battery positive electrode cap 7. The hollow insulating gasket 4, the aluminum sheet 5, the overcurrent protection sheet 6 and the outer side of the battery positive electrode cap 7 are wrapped inside the base 1;

[0028] The connecting convex surface 8 is a convex setting to facilitate the connection between the battery positive cap 7 and the circuit. The heat dissipation groove 9 plays a role in heat dissipation, so that the heat generated by the lithium battery can be dissipated through the heat dissipation groove 9. The safety valve is assembled through a hollow insulating gasket 4, an aluminum sheet 5, an overcurrent protection sheet 6, a battery positive cap 7 and a base 1, and is used to protect the lithium battery and prevent the lithium battery from exploding.

[0029] Working principle: Before using the double-protected lithium battery safety valve, you should first check whether the double-protected lithium battery safety valve has any problems that affect its use. First, install the battery safety valve at one end of the lithium battery. By installing the battery safety valve, you can prevent the lithium battery from exploding due to excessive internal pressure. After installing the safety valve, if the pressure is too high or causes the safety valve to deform, the pressure will be discharged through the safety valve. When the pressure affects the safety valve through the opened pressure relief hole 2, the air pressure will be discharged through the pressure relief hole 2 to protect the safety valve.

[0030] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A double-protection lithium battery safety valve, comprising a base (1), characterized in that: A first protection component is installed inside the base (1), and the first protection component is the first level of protection for the lithium battery safety valve. The first protection component comprises a pressure relief hole (2) and a sealing plug (3). The pressure relief hole (2) is opened through the inner wall of the base (1), and there are a plurality of pressure relief holes (2). A sealing plug (3) is installed inside the pressure relief hole (2), and the sealing plug (3) is used to close a plurality of pressure relief holes (2).

2. A double protection lithium battery safety valve according to claim 1, characterized in that: A battery positive electrode cap (7) is installed inside the top of the base (1), and a second protection component is installed on the top of the battery positive electrode cap (7), wherein the second protection component is a second level of protection for the lithium battery safety valve.

3. A double protection lithium battery safety valve according to claim 2, characterized in that: The second protection component comprises a storage shell (10) and a sealing film (11); the storage shell (10) is fixed inside the positive electrode cap (7) of the battery; the interior of the storage shell (10) is used to store the fire extinguishing agent; the bottom of the storage shell (10) is open; and the sealing film (11) is fixed to the bottom of the storage shell (10).

4. A double protection lithium battery safety valve according to claim 3, characterized in that: The central top of the battery positive electrode cap (7) is convexly provided with a connecting convex surface (8), and a heat dissipation groove (9) is provided on the outer side of the connecting convex surface (8).

5. The double protection lithium battery safety valve according to claim 1, characterized in that: A hollow insulating gasket (4) is installed inside the base (1), and an aluminum sheet (5) is installed on the top of the hollow insulating gasket (4).

6. A double protection lithium battery safety valve according to claim 5, characterized in that: An overcurrent protection sheet (6) is installed on the top of the aluminum sheet (5), and the overcurrent protection sheet (6) is located below the battery positive electrode cap (7).

7. A double protection lithium battery safety valve according to claim 6, characterized in that: The outer sides of the hollow insulating gasket (4), the aluminum sheet (5), the overcurrent protection sheet (6) and the battery positive electrode cap (7) are wrapped inside the base (1).

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