Battery explosion-proof valve and battery

Abstract

The invention relates to the technical field of batteries, in particular to a battery explosion-proof valve and a battery. The battery explosion-proof valve comprises a protective shell, an ejector pin and a diaphragm, the protective shell comprises a shell body and a protective cover which are integrally connected in an injection molding mode, the shell body is in a barrel shape with two open ends, radial exhaust holes are formed in the peripheral wall of the shell body, the protective cover is connected to the opening in one end of the shell body in a plugging mode, and the opening in the other end of the shell body is a pressure relief hole. The pressure relief hole is communicated with the radial exhaust hole and the interior of the battery, the ejector pin is arranged on the top wall of the protective cover and located in the inner cavity of the shell body, the diaphragm covers the pressure relief hole, and gas exhausted from the interior of the battery can drive the diaphragm to deform towards the ejector pin so that the diaphragm can be punctured by the ejector pin. According to the battery explosion-proof valve, the processing technology of the battery explosion-proof valve can be simplified, the processing cost is low, and the failure of the diaphragm can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery explosion-proof valve and a battery. Background Art

[0002] Batteries need to balance the external atmospheric pressure in daily use, and batteries need to quickly discharge the gas generated inside the battery under extreme thermal runaway conditions. Currently, a battery explosion-proof valve is usually installed on the battery casing of the battery to achieve the above functions.

[0003] Most of the existing battery explosion-proof valves are ejector-type explosion-proof valves, in which the diaphragm is exposed to the external environment. In actual use, the battery may be installed in a complex environment, such as contact with gravel, water flow impact, etc., and the diaphragm is easily affected by the environment and fails. In the related art, in order to improve the protection of the diaphragm, a protective cover is usually installed on the shell, but the shell and the protective cover are mostly produced separately, and then the shell and the protective cover are assembled, which makes the processing technology complicated and requires additional installation technology, increasing the processing cost.

[0004] Therefore, there is an urgent need for a battery explosion-proof valve and a battery to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a battery explosion-proof valve and a battery, so as to simplify the processing technology of the battery explosion-proof valve, facilitate the processing of the battery explosion-proof valve, and reduce the processing cost, and also improve the protection effect of providing a diaphragm to avoid diaphragm failure.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A battery explosion-proof valve, comprising:

[0008] A protective shell, the protective shell is used to be installed on the battery shell of the battery, the protective shell includes a shell body and a protective cover connected by integral injection molding, the shell body is in a cylindrical shape with openings at both ends, a radial exhaust hole is opened on the outer peripheral wall of the shell body, the protective cover is sealed and connected to an opening at one end of the shell body, and the other end of the shell body is a pressure relief hole, and the pressure relief hole is connected to the radial exhaust hole and the interior of the battery;

[0009] An ejector pin is disposed on the top wall of the protective cover and is located in the inner cavity of the shell body;

[0010] A diaphragm is covered in the pressure relief hole, and the gas discharged from the battery can drive the diaphragm to deform toward the ejector pin, so that the diaphragm is punctured by the ejector pin.

[0011] As an optional solution, the ejector pin is integrally injection-molded on the top wall of the protective cover.

[0012] As an optional solution, the protective shell further includes:

[0013] A plurality of reinforcing ribs are arranged at intervals along the circumference of the ejector pin, and the reinforcing ribs are connected between the outer wall of the ejector pin and the top wall of the protective cover.

[0014] As an optional solution, a plurality of radial exhaust holes are provided on the outer peripheral wall of the shell body at intervals along the circumference thereof.

[0015] As an optional solution, the ejector pin includes a connecting column portion and a needle head portion that are connected to each other, the connecting column portion is arranged on the top wall of the protective cover, the needle head portion is configured to puncture the diaphragm, and an inner groove extending along the axial direction of the connecting column portion is arranged in the connecting column portion, and the inner groove passes through the protective cover.

[0016] As an optional solution, the protective shell further includes:

[0017] The mounting portion is connected to the end of the shell body away from the protective cover, and the mounting portion is snap-fitted and mounted on the battery shell.

[0018] As an optional solution, the mounting portion includes a plurality of arc-shaped clips arranged at intervals along the circumference of the shell body, the arc-shaped clips are connected to the end of the shell body away from the protective cover, and each end of the arc-shaped clip is provided with an abutment tongue, which is clamped and installed in the mounting hole of the battery shell.

[0019] As an optional solution, an annular protrusion is arranged on the outer peripheral wall of the protective shell, and the battery explosion-proof valve further comprises a sealing ring, which is sleeved on the outer peripheral wall of the protective shell and clamped between the annular protrusion and the battery shell.

[0020] As an optional solution, the diaphragm is connected to the cavity wall of the protective shell by welding.

[0021] As an option, the membrane is a gas permeable membrane.

[0022] A battery comprises a battery casing and the battery explosion-proof valve as described above, wherein the protective shell is installed on the battery casing.

[0023] Beneficial effects of the present invention:

[0024] The present invention provides a battery explosion-proof valve, which includes a protective shell, an ejector pin and a diaphragm, wherein the protective shell includes a shell body and a protective cover connected by integral injection molding, the shell body is cylindrical with openings at both ends, radial exhaust holes are provided on the outer peripheral wall of the shell body, the protective cover is sealed and connected to one end opening of the shell body, and the other end opening of the shell body is a pressure relief hole, the pressure relief hole connects the radial exhaust hole and the interior of the battery, the ejector pin is arranged on the top wall of the protective cover and is located in the inner cavity of the shell body, the diaphragm covers the pressure relief hole, when thermal runaway occurs inside the battery, the gas discharged from the inside of the battery can drive the diaphragm to deform toward the ejector pin, so that the diaphragm is punctured by the ejector pin, so that the gas inside the battery can be quickly discharged through the pressure relief hole and the radial exhaust hole in sequence to achieve pressure relief. The battery explosion-proof valve provided by the present invention is formed by integral injection molding of the shell body and the protective cover, and no additional assembly is required between the shell body and the protective cover, which simplifies the processing technology of the battery explosion-proof valve, is easy to process and has low cost. In addition, since the diaphragm covers the pressure relief hole in the inner cavity of the shell body, and only radial exhaust holes are opened on the outer peripheral wall of the shell body, the protective shell provides a protective effect for the diaphragm, effectively avoiding diaphragm failure and meeting the IP6K9K protection level.

[0025] The present invention also provides a battery. By applying the battery explosion-proof valve, the processing technology of the battery explosion-proof valve is simplified, the processing is convenient and the cost is low, and the failure of the diaphragm is effectively avoided, the protection effect of the diaphragm is improved, and the IP6K9K protection level is met. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a first structural schematic diagram of a battery explosion-proof valve provided by an embodiment of the present invention;

[0027] Figure 2 is a second structural schematic diagram of a battery explosion-proof valve provided in an embodiment of the present invention;

[0028] Figure 3 It is a structural cross-sectional view of a battery explosion-proof valve provided by an embodiment of the present invention.

[0029] In the figure:

[0030] 20. battery housing; 201. mounting hole;

[0031] 1. Protective shell; 11. Shell body; 111. Radial exhaust hole; 112. Inner cavity; 113. Pressure relief hole; 114. Annular protrusion; 12. Protective cover; 13. Reinforcement rib; 14. Mounting part; 141. Arc-shaped card plate; 1411. Abutment tongue;

[0032] 2. ejector pin; 21. connecting column; 211. inner groove; 22. needle head;

[0033] 3. Diaphragm;

[0034] 4. Sealing ring. DETAILED DESCRIPTION

[0035] In order to make the technical problem solved by the present invention, the technical solution adopted and the technical effect achieved more clearly, the technical solution of the present invention is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0036] In the description of the present invention, unless otherwise clearly specified 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 an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] Most of the existing battery explosion-proof valves are ejector-type explosion-proof valves, in which the diaphragm is exposed to the external environment. In actual use, the battery may be installed in a complex environment, such as contact with gravel, water flow impact, etc., and the diaphragm is easily affected by the environment and fails. In the related art, in order to improve the protection of the diaphragm, a protective cover is usually installed on the shell, but the shell and the protective cover are mostly produced separately, and then the shell and the protective cover are assembled, which makes the processing technology complicated and requires additional installation technology, increasing the processing cost.

[0040] In order to solve the above problems, Figure 1 to Figure 3 As shown, this embodiment provides a battery explosion-proof valve, which includes a protective shell 1, a ejector pin 2 and a diaphragm 3, wherein the protective shell 1 is used to be installed on a battery shell 20 of a battery, the protective shell 1 includes a shell body 11 and a protective cover 12 which are integrally connected by injection molding, the shell body 11 is in a cylindrical shape with openings at both ends, and a radial exhaust hole 111 is opened on the outer peripheral wall of the shell body 11, the protective cover 12 is sealed and connected to an opening at one end of the shell body 11, and the other end of the shell body 11 is opened as a pressure relief hole 113, the pressure relief hole 113 communicates with the radial exhaust hole 111 and the interior of the battery, the ejector pin 2 is arranged on the top wall of the protective cover 12, and is located in the inner cavity 112 of the shell body 11, the diaphragm 3 covers the pressure relief hole 113, and the gas discharged from the inside of the battery can drive the diaphragm 3 to deform toward the ejector pin 2, so that the diaphragm 3 is punctured by the ejector pin 2. The battery explosion-proof valve provided in this embodiment, when thermal runaway occurs inside the battery, the gas discharged from the battery can drive the diaphragm 3 to deform toward the ejector pin 2, so that the diaphragm 3 is punctured by the ejector pin 2, so that the gas inside the battery can be quickly discharged through the pressure relief hole 113 and the radial exhaust hole 111 in sequence to achieve pressure relief. The battery explosion-proof valve provided in this embodiment is formed by integrally injection molding the shell body 11 and the protective cover 12, and no additional assembly is required between the shell body 11 and the protective cover 12, which simplifies the processing technology of the battery explosion-proof valve, facilitates processing and has low cost. In addition, because the diaphragm 3 covers the pressure relief hole 113 in the inner cavity 112 of the shell body 11, and only the radial exhaust hole 111 is opened on the outer peripheral wall of the shell body 11, the protective shell 1 provides a good protection effect for the diaphragm 3, effectively avoiding the failure of the diaphragm 3, and meeting the IP6K9K protection level.

[0041] Optionally, in this embodiment, the diaphragm 3 is directly opposite to the ejector pin 2, and the diaphragm 3 is located on the side of the ejector pin 2 close to the battery housing 20, thereby ensuring that when thermal runaway occurs inside the battery, the gas discharged from the battery drives the diaphragm 3 to deform toward the ejector pin 2, thereby ensuring that the diaphragm 3 is punctured by the ejector pin 2.

[0042] Optionally, in this embodiment, the diaphragm 3 is a breathable membrane. Under normal circumstances, the internal environment of the battery is connected to the external environment through the diaphragm 3 and the radial exhaust holes 111 in sequence and performs gas exchange; when thermal runaway occurs inside the battery, due to the large amount of gas generated inside the battery, the gas inside the battery cannot quickly pass through the diaphragm 3, so that the gas discharged from the battery can drive the diaphragm 3 to deform toward the ejector pin 2, so that the diaphragm 3 is punctured by the ejector pin 2, thereby ensuring that the gas inside the battery can be quickly discharged through the pressure relief hole 113 and the radial exhaust hole 111 in sequence to achieve pressure relief.

[0043] Optionally, in this embodiment, the material of the diaphragm 3 is expanded polytetrafluoroethylene (expanded PTFE, E-PTFE). The material of the above-mentioned diaphragm 3 makes the diaphragm 3 have the function of waterproof and breathable, so that the diaphragm 3 can meet the requirements of balancing the air pressure of the battery during daily use. It should be noted that the material of the above-mentioned diaphragm 3 is limited so that the micropore diameter of the diaphragm 3 is between 0.1μm and 10μm, while the average diameter of air molecules is only 0.00036μm, the average diameter of water vapor is 0.00047μm, and the diameter of drizzle is about 500μm, that is, the pore size of the diaphragm 3 is more than 1000 times larger than the gas diameter, which is one thousandth of the water droplet. In addition, since the surface energy of the diaphragm 3 is very low, under the action of surface tension (water molecules pull each other), small water droplets will quickly form larger water droplets on the surface of the diaphragm 3, so the gas can pass through the diaphragm 3 smoothly, while liquid water cannot pass through the diaphragm 3, so the diaphragm 3 has good waterproof and breathable properties.

[0044] Optionally, in this embodiment, the diaphragm 3 is connected to the cavity wall of the protective shell 1 by welding, thereby ensuring the stability and tightness of the connection and fixation between the diaphragm 3 and the protective shell 1. Optionally, in this embodiment, the diaphragm 3 and the cavity wall of the protective shell 1 can be connected by ultrasonic welding, which has the advantages of high control accuracy, high connection strength, stability and reliability, energy saving and environmental protection, and high efficiency and low cost. In other embodiments, the diaphragm 3 and the cavity wall of the protective shell 1 can also be welded by heat welding or other welding methods.

[0045] In this embodiment, if Figure 1 to Figure 3 As shown, the ejector pin 2 is integrally injection molded on the top wall of the protective cover 12. The above arrangement enables the shell body 11, the protective cover 12 and the ejector pin 2 to be integrally injection molded, which simplifies the process and facilitates processing, and also ensures the structural strength of the entire battery explosion-proof valve. It should be noted that in this embodiment, the protective cover 12 and the diaphragm 3 are arranged at intervals along the axial direction of the shell body 11, and the protective cover 12 and the diaphragm 3 are parallel to each other, thereby ensuring the protective blocking effect of the protective cover 12 on the diaphragm 3.

[0046] Optionally, in this embodiment, if Figure 1 to Figure 3 As shown, the protective shell 1 further includes a mounting portion 14, the mounting portion 14 is connected to the end of the shell body 11 away from the protective cover 12, and the mounting portion 14 is snap-fitted and mounted on the battery shell 20. By snap-fitting the mounting portion 14 on the battery shell 20, the installation and removal of the entire battery explosion-proof valve at the battery shell 20 is facilitated.

[0047] In this embodiment, the mounting portion 14 includes a plurality of arc-shaped card plates 141 arranged at intervals along the circumference of the shell body 11, and the arc-shaped card plates 141 are connected to the end of the shell body 11 away from the protective cover 12, and the end of each arc-shaped card plate 141 is provided with an abutment tongue 1411, and the abutment tongue 1411 is snap-fitted and mounted in the mounting hole 201 of the battery shell 20. When the mounting portion 14 is inserted into the mounting hole 201 of the battery shell 20, each arc-shaped card plate 141 shrinks toward the inside under the squeezing action of the hole wall of the mounting hole 201, and when the mounting portion 14 is fully inserted into the mounting hole 201 of the battery shell 20, each arc-shaped card plate 141 is elastically reset, and the abutment tongue 1411 is tightly pressed against the hole wall in the mounting hole 201, thereby ensuring the reliable installation of the mounting portion 14 in the mounting hole 201. When the mounting portion 14 needs to be removed from the mounting hole 201, each arc-shaped clamping plate 141 is squeezed inwardly to disengage the abutting tongue 1411 from the abutting wall of the mounting hole 201. By designing the mounting portion 14 as a plurality of arc-shaped clamping plates 141 spaced apart along the circumference of the housing body 11, the reliability of the connection of the mounting portion 14 in the mounting hole 201 is ensured, and each arc-shaped clamping plate 141 is also easily slightly elastically deformed.

[0048] In this embodiment, if Figure 1 to Figure 3 As shown, an annular protrusion 114 is provided on the outer peripheral wall of the shell body 11, and the battery explosion-proof valve further includes a sealing ring 4, which is sleeved on the outer peripheral wall of the shell body 11, and the sealing ring 4 is sandwiched between the annular protrusion 114 and the battery shell 20. By providing the sealing ring 4, the airtightness of the entire battery explosion-proof valve connected at the battery shell 20 is ensured. Optionally, the sealing ring 4 can be a VQM sealing ring, so that the sealing ring 4 has the advantages of high temperature resistance and good elasticity.

[0049] Optionally, in this embodiment, the protective shell 1 further includes a plurality of reinforcing ribs 13, which are arranged at intervals along the circumference of the ejector pin 2, and the reinforcing ribs 13 are connected between the outer wall of the ejector pin 2 and the top wall of the protective cover 12. By providing the reinforcing ribs 13, the connection strength between the ejector pin 2 and the protective shell 1 is ensured, thereby ensuring the structural strength of the entire battery explosion-proof valve. In addition, the structural design of the reinforcing ribs 13 facilitates the integral injection molding of the shell body 11, the protective cover 12 and the ejector pin 2, and also avoids clogging of the radial exhaust hole 111, thereby ensuring the communication between the radial exhaust hole 111 and the pressure relief hole 113.

[0050] Optionally, in this embodiment, if Figure 3As shown, a plurality of radial exhaust holes 111 are arranged at intervals along the circumference of the outer wall of the shell body 11. The above arrangement improves the exhaust effect. Optionally, in this embodiment, the plurality of radial exhaust holes 111 are evenly spaced along the circumference of the shell body 11 to ensure uniform exhaust at various positions on the outer circumference of the shell body 11. Optionally, the shape of the radial exhaust hole 111 can be an ellipse, a rectangle, a circle or a polygon.

[0051] In this embodiment, if Figure 3 As shown, the ejector pin 2 includes a connecting column 21 and a needle head 22 connected to each other, wherein the connecting column 21 is arranged on the top wall of the protective cover 12, the needle head 22 is used to pierce the diaphragm 3, and an inner groove 211 extending along the axial direction of the connecting column 21 is arranged in the connecting column 21, and the inner groove 211 penetrates the protective cover 12. The structural design of the ejector pin 2 ensures the structural strength of the entire battery explosion-proof valve. In addition, the design of the inner groove 211 facilitates the integral injection molding of the entire protective shell 1 and the ejector pin 2, and also saves material costs.

[0052] The present embodiment further provides a battery, which includes a battery housing and the battery explosion-proof valve described above, and the protective shell 1 is installed on the battery housing. The battery provided in the present embodiment simplifies the processing technology of the battery explosion-proof valve by applying the battery explosion-proof valve described above, is easy to process and has low cost, and also effectively avoids the failure of the diaphragm 3, thereby improving the protective effect of the diaphragm 3. Specifically, in the present embodiment, a mounting hole 201 is provided on the battery housing, and the mounting portion 14 of the protective shell 1 is directly installed in the mounting hole 201.

[0053] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery explosion-proof valve, characterized in that: include: A protective shell (1), the protective shell (1) being used to be installed on a battery shell (20) of a battery, the protective shell (1) comprising a shell body (11) and a protective cover (12) connected by integral injection molding, the shell body (11) being in the shape of a cylinder with openings at both ends, a radial exhaust hole (111) being provided on the outer peripheral wall of the shell body (11), the protective cover (12) being sealed and connected to an opening at one end of the shell body (11), the other end of the shell body (11) being a pressure relief hole (113), the pressure relief hole (113) being connected to the radial exhaust hole (111) and the interior of the battery; An ejector pin (2) is arranged on the top wall of the protective cover (12) and is located in the inner cavity (112) of the housing body (11); as well as A diaphragm (3) is covered in the pressure relief hole (113), and the gas discharged from the battery can drive the diaphragm (3) to deform toward the ejector pin (2), so that the diaphragm (3) is punctured by the ejector pin (2).

2. The battery explosion-proof valve according to claim 1, characterized in that: The ejector pin (2) is integrally injection-molded on the top wall of the protective cover (12).

3. The battery explosion-proof valve according to claim 2, characterized in that: The protective shell (1) further comprises: A plurality of reinforcing ribs (13), wherein the plurality of reinforcing ribs (13) are arranged at intervals along the circumference of the ejector pin (2), and the reinforcing ribs (13) are connected between the outer wall of the ejector pin (2) and the top wall of the protective cover (12).

4. The battery explosion-proof valve according to any one of claims 1 to 3, characterized in that: A plurality of radial exhaust holes (111) are provided on the outer peripheral wall of the shell body (11) at intervals along the circumferential direction thereof.

5. The battery explosion-proof valve according to any one of claims 1 to 3, characterized in that: The ejector pin (2) comprises a connecting column portion (21) and a needle head portion (22) which are connected to each other, wherein the connecting column portion (21) is arranged on the top wall of the protective cover (12), the needle head portion (22) is configured to puncture the diaphragm (3), and an inner groove (211) extending along the axial direction of the connecting column portion (21) is arranged in the connecting column portion (21), and the inner groove (211) passes through the protective cover (12).

6. The battery explosion-proof valve according to any one of claims 1 to 3, characterized in that: The protective shell (1) further comprises: A mounting portion (14), the mounting portion (14) being connected to an end of the housing body (11) away from the protective cover (12), and the mounting portion (14) being snap-fitted and mounted on the battery housing (20).

7. The battery explosion-proof valve according to claim 6, characterized in that: The mounting portion (14) comprises a plurality of arc-shaped clamping plates (141) arranged at intervals along the circumference of the shell body (11); the arc-shaped clamping plates (141) are connected to the end of the shell body (11) away from the protective cover (12); and an abutting tongue (1411) is provided at the end of each arc-shaped clamping plate (141); the abutting tongue (1411) is clamped and mounted in the mounting hole (201) of the battery shell (20).

8. The battery explosion-proof valve according to any one of claims 1 to 3, characterized in that: An annular protrusion (114) is provided on the outer peripheral wall of the protective shell (1), and the battery explosion-proof valve further comprises a sealing ring (4), wherein the sealing ring (4) is sleeved on the outer peripheral wall of the protective shell (1), and the sealing ring (4) is sandwiched between the annular protrusion (114) and the battery shell (20).

9. The battery explosion-proof valve according to any one of claims 1 to 3, characterized in that: The diaphragm (3) is connected to the cavity wall of the protective shell (1) by welding.

10. The battery explosion-proof valve according to any one of claims 1 to 3, characterized in that: The diaphragm (3) is a breathable membrane.

11. A battery, characterized in that: It comprises a battery casing (20) and a battery explosion-proof valve according to any one of claims 1 to 10, wherein the protective shell (1) is installed on the battery casing (20).

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