Battery exhaust valve

Abstract

The utility model discloses a battery exhaust valve which comprises a hollow valve body capable of being installed on a battery shell or a battery top cover, the bottom end of the valve body is communicated with the interior of a battery, the top end of the valve body is communicated with the external environment, and a sealing gasket used for sealing a communication channel of the valve body and the interior of the battery is contained in the valve body. A sealing gasket is arranged at the upper end of the valve body, a spring is arranged in the valve body in a penetrating mode, the lower end of the spring abuts against the sealing gasket, an exhaust lock cover used for exhausting is arranged at the upper end of the valve body in a penetrating mode, the upper end of the spring abuts against the exhaust lock cover, and the spring can open the sealing gasket under the action of elastic force so that gas can be exhausted to the outside from the exhaust lock cover. The exhaust valve has the effects that gas in the battery can be exhausted when the battery needs to be exhausted, the sealing performance of the battery is ensured in the exhaust process, and the exhaust valve can be repeatedly used.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery exhaust valve. Background Art

[0002] Lithium-ion power batteries are increasingly popular due to their high energy density and various excellent performance properties. Cylindrical lithium-ion batteries, with their standardized dimensions, mature manufacturing processes, and equipment, allow for mass production, and therefore hold a significant share of the lithium-ion battery market. Over the long term, lithium batteries can experience various side reactions within the battery, due to factors such as the operating environment, charge and discharge rates, and overcharge and over-discharge. This gas accumulates within the battery, gradually increasing the internal pressure. In severe cases, it can cause explosive eruptions or explosions, posing a significant safety hazard. To prevent personal injury and property damage, a one-way exhaust valve is typically installed on the top cover of the lithium battery to release internal gas to the outside, thereby reducing internal pressure. Currently, one-way exhaust valves are used in lithium-ion batteries.

[0003] However, the existing exhaust valve opens the inlet end of the exhaust valve during exhaust to exhaust gas by extracting the internal gas. However, since the exhaust valve is open, the sealing performance of the battery is deteriorated, and external air and water molecules enter the battery, affecting the battery's electrical performance. Utility Model Content

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a battery exhaust valve.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A battery exhaust valve comprises: a hollow valve body which can be mounted on a battery casing or a battery top cover, the bottom end of the valve body being connected to the interior of the battery, the top end of the valve body being connected to the external environment, a sealing gasket being housed in the valve body for sealing the communication channel between the valve body and the interior of the battery, a spring being passed through the valve body, the lower end of the spring being in contact with the sealing gasket, an exhaust lock cover for exhausting gas being passed through the upper end of the valve body, the upper end of the spring being in contact with the exhaust lock cover, and the spring being able to open the sealing gasket under the action of elastic force to discharge gas from the exhaust lock cover to the outside world.

[0007] In one embodiment, the valve body includes a base and a cap, the base and the cap are fixedly connected, the upper and lower ends of the base are both opened, the lower end of the base is downwardly formed into a plug body that is inserted into the interior of the battery, the opening at the lower end of the base is connected to the interior of the battery, and a first space is formed inside the base.

[0008] In one embodiment, the cap is located above the base, and is open at both ends. A second space is formed inside the cap, and the second space is connected to the first space. The upper end opening of the cap is connected to the external environment.

[0009] In one embodiment, the sealing gasket is located at the inner bottom of the base, and the sealing gasket abuts against the lower opening of the base.

[0010] In one embodiment, a spring cup is provided in the base and the cap, the upper end of the spring cup is open, the interior of the spring cup is connected to the first space and the second space, the spring is provided in the spring cup, and the spring cup abuts against the upper end surface of the sealing gasket under the elastic force of the spring.

[0011] In one embodiment, the exhaust lock cover is arranged on the upper end surface of the cap, the exhaust lock cover is fixedly connected to the upper end of the cap, the upper end of the spring cup is a certain distance away from the lower end surface of the exhaust lock cover, the upper end of the spring extends out of the spring cup and abuts against the lower end surface of the exhaust lock cover, and an exhaust port is opened in the middle position of the exhaust lock cover, the exhaust port is connected with the internal space of the spring cup, the first space and the second space, and the exhaust port is directly opposite to the center position of the spring.

[0012] In one embodiment, the exhaust lock cover is provided with a limit block for limiting the spring on the outside relative to the exhaust port, and there are two limit blocks. The two limit blocks are relatively arranged on the lower end surface of the exhaust lock cover, and one end of the two limit blocks away from the exhaust lock cover extends into the interior of the spring. The two limit blocks are used to limit the left and right movement of the spring.

[0013] In one embodiment, a fixing assembly for fixing is provided between the exhaust lock cover and the cap, and the fixing assembly includes a fixing block provided on the outer periphery of the exhaust lock cover and an abutment block provided on the cap, the fixing block protrudes from the outer side of the exhaust lock cover and extends toward the inner wall of the cap, the abutment block is provided at the upper end of the cap, and the abutment block is provided in an arc shape from the connection with the upper end of the cap to the center position of the cap, and the lower side of the abutment block is fixedly connected to the upper side of the fixing block.

[0014] In one embodiment, there are two fixed blocks, which are symmetrically distributed along the circumferential direction of the exhaust lock cover, and there are two abutment blocks, which are symmetrically distributed along the circumferential direction of the upper end of the cap, and the two abutment blocks respectively abut against the upper surfaces of the two fixed blocks.

[0015] In one embodiment, extensions for limiting the rotation of the exhaust lock cover are provided at both ends of the fixed block, and the fixed block and the extensions at both ends are combined to form a U-shaped block, and the two extensions are provided relative to the two outer sides of the abutment block.

[0016] Compared with the prior art, the present invention has at least the following advantages:

[0017] 1. A battery exhaust valve of the utility model cooperates with a sealing gasket, a spring cup, a spring and an exhaust lock cover. When the battery does not need to be exhausted, the spring cup is abutted against the sealing gasket by the elastic force of the spring to seal the opening at the lower end of the base, thereby ensuring the sealing of the battery. When the internal pressure of the battery increases and exhaust is required, the sealing gasket is pushed upward to squeeze the spring to move the spring cup upward, and the gas in the battery enters the first space and the second space. The spring cup is pushed by the sealing gasket to abut against the lower end surface of the exhaust lock cover to ensure the sealing of the battery. Until the internal pressure of the battery decreases, the sealing gasket and the spring cup move downward, and the gas in the valve body is discharged through the exhaust port in the center of the spring. While the gas is being discharged, the sealing gasket seals the lower end opening of the base downward. The whole process ensures the sealing of the battery and prevents outside air from entering the battery from the exhaust port and affecting the battery performance.

[0018] 2. The exhaust port in the battery exhaust valve of the utility model can be used for filling the battery, and the valve body can be reused. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for use in the embodiments.

[0020] Figure 1 This is a schematic structural diagram of a battery exhaust valve provided by the utility model;

[0021] Figure 2 This is a schematic cross-sectional view of the lower opening of the sealing base of a sealing gasket in a battery exhaust valve provided by the utility model;

[0022] Figure 3 This is a schematic cross-sectional view of the lower opening of the base of a battery exhaust valve provided by the utility model with a sealing gasket opened;

[0023] Figure 4 This is a structural schematic diagram of a battery exhaust valve provided by the utility model from another perspective.

[0024] Description of the drawings: 10, valve body; 11, base; 111, plug body; 112, first space; 12, cap; 121, second space; 122, abutment block; 20, sealing gasket; 30, spring cup; 40, spring; 50, exhaust lock cover; 51, exhaust port; 52, limit block; 53, fixing block; 531, extension part. DETAILED DESCRIPTION

[0025] In order to facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0026] A battery exhaust valve, referring to Figure 1 The invention comprises a hollow valve body 10 which can be mounted on a battery housing or a battery cover. The bottom end of the valve body 10 can communicate with the interior of the battery, and the top end of the valve body 10 can communicate with the external environment. In this embodiment, the valve body 10 can be used on different rechargeable batteries and has strong adaptability.

[0027] Reference Figure 1 The valve body 10 includes a base 11 and a cap 12, which are fixedly connected. The base 11 is T-shaped, with openings at both ends. The opening at the lower end of the base 11 is smaller than the opening at the upper end. The lower end of the base 11 extends downward to form a plug 111 that plugs into the interior of the battery, facilitating installation. The opening at the lower end of the base 11 communicates with the interior of the battery, and the hollow interior of the base 11 forms a first space 112.

[0028] Reference Figure 2 and Figure 3 The cap 12 is located above the base 11 and is in an inverted T-shape. The lower end surface of the cap 12 is connected and fixed to the upper end surface of the base 11. The cap 12 is also open at both ends. A second space 121 is formed inside the hollow cap 12. The second space 121 is connected to the first space 112. The upper end opening of the cap 12 connects the second space 121 with the external environment.

[0029] Further, refer to Figure 2 and Figure 3 The base 11 contains a sealing gasket 20 for sealing the communication channel between the valve body 10 and the interior of the battery. The sealing gasket 20 is located at the inner bottom of the base 11. The sealing gasket 20 abuts against the lower end opening of the base 11 to block the communication between the valve body 10 and the interior of the battery, thereby ensuring the sealing of the battery and preventing external air and water molecules from entering the battery and affecting the electrical performance of the battery.

[0030] Reference Figure 2 and Figure 3A spring cup 30 is provided in the base 11 and the cap 12. The spring cup 30 is axially arranged in the first space 112 and the second space 121. The upper end of the spring cup 30 is open, and the interior of the spring cup 30 is connected to the first space 112 and the second space 121. A spring 40 is provided in the spring cup 30. The spring 40 is axially arranged in the spring cup 30 and is arranged along the length direction of the spring cup 30. The bottom of the spring cup 30 abuts against the upper end surface of the sealing gasket 20. The spring 40 is elastic. Under the action of the elastic force of the spring 40, the lower end of the spring 40 abuts against the upper end of the sealing gasket 20 through the spring cup 30, thereby strengthening the sealing of the sealing gasket 20 to the lower end opening of the base 11 to ensure the sealing of the battery.

[0031] Reference Figure 2 and Figure 3 Because the upper end of the spring cup 30 is open, the upper end of the spring 40 is connected to the outside. The upper end surface of the cap 12 is provided with a vent lock cover 50 for exhausting gas from the battery. The vent lock cover 50 is inserted into the cap 12 and fixedly connected to the upper end of the cap 12. The upper end of the spring 40 abuts against the lower end surface of the vent lock cover 50. Under normal conditions, the upper end of the spring 40 abuts against the lower end surface of the vent lock cover 50, and the lower end of the spring 40 abuts against the sealing gasket 20 to ensure sealing.

[0032] Reference Figure 2 and Figure 3 An exhaust port 51 is defined in the center of the exhaust lock cover 50. The exhaust port 51 extends through the upper and lower sides of the exhaust lock cover 50 and communicates with the interior of the spring cup 30, the first space 112, and the second space 121. The exhaust port 51 is positioned directly opposite the center of the spring 40. The upper end of the spring cup 30 is a predetermined distance from the lower end of the exhaust lock cover 50, while the upper end of the spring 40 extends outside the spring cup 30 and abuts the lower end of the exhaust lock cover 50.

[0033] Reference Figure 2 and Figure 3 The exhaust lock cover 50 is provided with a stopper 52 on the outside of the exhaust port 51 for limiting the position of the spring 40. There are two stoppers 52, which are arranged opposite each other and fixed to the lower end surface of the exhaust lock cover 50. The ends of the two stoppers 52 away from the exhaust lock cover 50 extend into the interior of the spring 40. The distance between the two stoppers 52 is adapted to the inner diameter of the spring 40, so that the spring 40 is sleeved outside the two stoppers 52, thereby allowing the spring 40 to move only axially and not left or right.

[0034] Reference Figure 2 and Figure 3When the internal air pressure of the battery is too high, the internal air pressure of the battery exerts an upward force on the sealing gasket 20. The sealing gasket 20 is forced upward to squeeze the spring cup 30 and the spring 40. The spring cup 30 no longer abuts the sealing gasket 20, so that the opening at the lower end of the base 11 is opened, and the gas in the battery enters the first space 112 and the second space 121. When the sealing gasket 20 continues to move upward, the spring cup 30 moves upward synchronously until the upper end of the spring cup 30 abuts against the lower end surface of the exhaust lock cover 50, closing the exhaust hole of the exhaust lock cover 50. The gas in the first space 112 and the second space 121 cannot enter the spring cup 30, thereby ensuring the sealing of the battery. When the internal pressure of the battery decreases, the thrust on the sealing gasket 20 decreases. The sealing gasket 20 moves downward, and the spring cup 30 moves downward simultaneously. The gas in the first space 112 and the second space 121 is discharged to the outside through the exhaust port 51. As the gas is continuously discharged, the sealing gasket 20 gradually moves downward until it seals the opening at the lower end of the base 11. This ensures the battery's sealing during the gas discharge process and prevents external air and moisture from entering the battery through the exhaust port 51. In this embodiment, the exhaust port 51 can also be used as a battery liquid injection port.

[0035] Battery vent valves in the prior art cannot be removed or need to be reinstalled after venting the battery, and a separate injection hole is required on the battery to inject liquid into the battery. However, the vent port 51 of the vent lock cover 50 in this embodiment can not only be used to discharge gas generated in the battery and balance the internal pressure of the battery, but the vent port 51 can also be used for injection, eliminating the need for an additional injection hole on the battery. Moreover, the valve body 10 with the vent lock cover 50 can be reused.

[0036] Further, refer to Figure 3 and Figure 4 A fixing assembly is provided between the exhaust lock cover 50 and the cap 12 for fixing. The fixing assembly includes a fixing block 53 provided on the outer periphery of the exhaust lock cover 50 and an abutting block 122 provided on the cap 12. The fixing block 53 is provided on the outer periphery of the exhaust lock cover 50, protruding from the outer side of the exhaust lock cover 50, and extending toward the inner wall of the cap 12. The abutting block 122 is provided at the upper end of the cap 12. The abutting block 122 is provided in an arc shape from the connection with the upper end of the cap 12 to the center position of the cap 12. The lower end of the abutting block 122 is provided in a flat shape. The abutting block 122 is located above the fixing block 53, and the lower side of the abutting block 122 is fixedly connected to the upper side of the fixing block 53.

[0037] Further, refer to Figure 3 and Figure 4There are two fixing blocks 53, which are symmetrically distributed along the circumference of the exhaust lock cover 50. There are also two abutment blocks 122, which are symmetrically distributed along the circumference of the upper end of the cap 12. The two abutment blocks 122 abut against the upper surfaces of the two fixing blocks 53, respectively, to limit the upward movement of the exhaust lock cover 50 and prevent the exhaust lock cover 50 from moving upward under the pressure of the spring 40.

[0038] Further, refer to Figure 3 and Figure 4 , extension parts 531 for limiting the rotation of the exhaust lock cover 50 are provided at both ends of the fixed block 53, and the fixed block 53 and the extension parts 531 at both ends are combined to form a U-shaped block. The two extension parts 531 are arranged relative to the two outer sides of the abutment block 122 to limit the position of the exhaust lock cover 50 when it is rotated under force. The two limiting parts abut against the outer side of the abutment block 122 when the exhaust lock cover 50 is rotated under force to limit the rotation of the exhaust lock cover 50, so that the position of the exhaust lock cover 50 is fixed.

[0039] The exhaust valve is coordinated by setting a sealing gasket 20, a spring cup 30, a spring 40 and an exhaust lock cover 50. When the battery does not need to be exhausted, the spring cup 30 is elastically forced to abut the sealing gasket 20 by the spring 40 to seal the opening at the lower end of the base 11, thereby ensuring the sealing of the battery. When the internal pressure of the battery increases and needs to be exhausted, the sealing gasket 20 is pushed upward to squeeze the spring 40, causing the spring cup 30 to move upward, and the gas in the battery enters the first space 112 and the second space 121. The spring cup 30 is pushed by the sealing gasket 20 to abut against the lower end surface of the exhaust lock cover 50, ensuring the sealing of the battery. Until the internal pressure of the battery decreases, the sealing gasket 20 and the spring cup 30 move downward, and the gas in the valve body 10 is discharged through the exhaust port 51 in the center of the spring 40. While the gas is being discharged, the sealing gasket 20 seals the lower end opening of the base 11 downward. The whole process ensures the sealing of the battery, preventing outside air from entering the battery from the exhaust port 51 and affecting the battery performance. The exhaust port 51 on the valve body 10 can be used as a liquid injection hole to inject liquid into the battery.

[0040] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person of ordinary skill in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. A battery exhaust valve, characterized in that: include: A hollow valve body (10) can be installed on a battery shell or a battery top cover, the bottom end of the valve body (10) is communicated with the interior of the battery, the top end of the valve body (10) is communicated with the external environment, the valve body (10) contains a sealing gasket (20) for sealing the communication channel between the valve body (10) and the interior of the battery, a spring (40) is passed through the valve body (10), the lower end of the spring (40) abuts against the sealing gasket (20), the upper end of the valve body (10) is passed through an exhaust lock cover (50) for exhaust, the upper end of the spring (40) abuts against the exhaust lock cover (50), and the spring (40) can open the sealing gasket (20) under the action of elastic force to discharge gas from the exhaust lock cover (50) to the outside.

2. A battery exhaust valve according to claim 1, characterized in that: The valve body (10) comprises a base (11) and a cap (12), wherein the base (11) and the cap (12) are fixedly connected, and both upper and lower ends of the base (11) are open. The lower end of the base (11) is downwardly formed into a plug body (111) that is inserted into the interior of the battery, and the opening at the lower end of the base (11) is communicated with the interior of the battery, and a first space (112) is formed inside the base (11).

3. A battery exhaust valve according to claim 2, characterized in that: The cap (12) is located above the base (11), and is provided with openings at both ends. A second space (121) is formed in the cap (12), and the second space (121) is communicated with the first space (112). The upper opening of the cap (12) is communicated with the external environment.

4. A battery exhaust valve according to claim 3, characterized in that: The sealing gasket (20) is located at the inner bottom of the base (11), and the sealing gasket (20) abuts against the lower end opening of the base (11).

5. A battery exhaust valve according to claim 3, characterized in that: A spring cup (30) is provided in the base (11) and the cover cap (12), the upper end of the spring cup (30) is open, the interior of the spring cup (30) is connected with the first space (112) and the second space (121), the spring (40) is provided in the spring cup (30), and the spring cup (30) abuts against the upper end surface of the sealing gasket (20) under the elastic force of the spring (40).

6. A battery exhaust valve according to claim 5, characterized in that: The exhaust lock cover (50) is arranged on the upper end surface of the cover cap (12), and the exhaust lock cover (50) is fixedly connected to the upper end of the cover cap (12). The upper end of the spring cup (30) is a certain distance away from the lower end surface of the exhaust lock cover (50). The upper end of the spring (40) extends out of the spring cup (30) and abuts against the lower end surface of the exhaust lock cover (50). An exhaust port (51) is opened in the middle position of the exhaust lock cover (50), and the exhaust port (51) is connected with the internal space of the spring cup (30), the first space (112) and the second space (121). The exhaust port (51) is directly opposite to the center position of the spring (40).

7. A battery exhaust valve according to claim 6, characterized in that: The exhaust lock cover (50) is provided with a limit block (52) for limiting the spring (40) on the outer side relative to the exhaust port (51), and there are two limit blocks (52). The two limit blocks (52) are relatively arranged on the lower end surface of the exhaust lock cover (50), and one end of the two limit blocks (52) away from the exhaust lock cover (50) extends into the interior of the spring (40). The two limit blocks (52) are used to limit the left and right movement of the spring (40).

8. A battery exhaust valve according to claim 6, characterized in that: A fixing assembly for fixing is provided between the exhaust lock cover (50) and the cap (12), and the fixing assembly includes a fixing block (53) provided on the outer periphery of the exhaust lock cover (50) and an abutting block (122) provided on the cap (12), wherein the fixing block (53) protrudes from the outer side of the exhaust lock cover (50) and extends toward the inner wall of the cap (12), and the abutting block (122) is provided at the upper end of the cap (12), and the abutting block (122) is provided in an arc shape from the connection with the upper end of the cap (12) to the center position of the cap (12), and the lower side of the abutting block (122) is fixedly connected to the upper side of the fixing block (53).

9. A battery exhaust valve according to claim 8, characterized in that: There are two fixing blocks (53), and the two fixing blocks (53) are symmetrically distributed along the circumferential direction of the exhaust lock cover (50). There are two abutting blocks (122), and the two abutting blocks (122) are symmetrically distributed along the circumferential direction of the upper end of the cap (12). The two abutting blocks (122) respectively abut against the upper surfaces of the two fixing blocks (53).

10. A battery exhaust valve according to claim 9, characterized in that: Extensions (531) for limiting the rotation of the exhaust lock cover (50) are provided at both ends of the fixing block (53). The fixing block (53) and the extensions (531) at both ends are combined to form a U-shaped block. The two extensions (531) are provided relative to the two outer sides of the abutting block (122).

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