Anti-flatulence sodium ion battery
By designing a safety valve structure with a semispherical mounting groove and gas storage chamber in a sodium ion battery, the battery inflation problem is solved, the stable control and safety and reliability of the pressure in the battery are achieved, and the service life of the battery is extended.
Patent Information
- Application Number
- CN202421812390.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-30
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-07-30
AI Technical Summary
Sodium ion batteries are prone to inflation during the charge and discharge cycle, and the prior art is difficult to effectively prevent the battery from inflation, and existing safety valve designs have shortcomings in exhaust efficiency, recycling and safety.
A safety valve structure including a semi-spherical mounting groove, an air storage chamber, a valve cover and a valve core is designed to achieve controllable release of gas through a conical notch and an exhaust passage. The combination of an elastic valve and an air storage chamber is used to ensure the stability of the internal pressure of the battery and release excess gas through the air outlet if necessary.
It realizes stable control of the pressure in the battery, prevents the battery from being bloated and leaking, improves the safety and service life of the battery, and maintains the sealing and safety reliability of the battery.
Smart Images
Figure CN223052315U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sodium - ion batteries, and particularly relates to a sodium - ion battery for preventing bloating. Background Art
[0002] With the rapid development of renewable energy, electric vehicles and other fields, sodium - ion batteries have gradually become important participants in the energy storage market due to their advantages such as rich resources, high cost - effectiveness and environmental friendliness. However, in the practical application of sodium - ion batteries, an issue that cannot be ignored is the bloating phenomenon that may occur during the charge - discharge cycle. The bloating problem mainly stems from the gases generated inside the battery, which may come from the decomposition of the electrolyte, by - products of the positive and negative electrode material reactions, etc. When the gas accumulates inside the battery to a certain extent, it will cause the battery casing to expand, and in severe cases, it may even lead to safety problems such as battery rupture and leakage, seriously affecting the service life and safety performance of the battery. To address this issue, the current technical community has taken a series of measures, including but not limited to optimizing the battery material formula, improving the battery manufacturing process, strengthening the monitoring of the battery management system (BMS), etc. However, these measures still have certain limitations in preventing battery bloating and cannot completely avoid the occurrence of bloating.
[0003] In this context, setting a safety valve as an effective bloating prevention measure has gradually received attention. By setting a safety valve on the battery casing, excess gas can be automatically released when the internal pressure of the battery rises to a certain level, thus avoiding the bloating problem caused by excessive internal pressure of the battery. This design can not only improve the safety performance of the battery, but also extend the service life of the battery and reduce the maintenance cost. However, sodium - ion battery products with safety valves are not common in the current market, and the existing related designs still have deficiencies in aspects such as exhaust efficiency, recyclability, and safety. Therefore, it is necessary to optimize the design of the safety valve to achieve the recycling of the safety valve and more accurate and reliable gas release control, thereby effectively preventing battery bloating and improving the overall performance of the battery. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a sodium - ion battery for preventing bloating, and solve the problems of easy bloating and poor exhaust effect of existing sodium - ion batteries.
[0005] To solve the above - mentioned technical problems, the technical solution adopted by the utility model is as follows:
[0006] An anti-gas expansion sodium-ion battery, comprising a sodium-ion battery cell, a housing, a cover plate, and a safety valve, is characterized in that: a hemispherical installation groove is formed in the cover plate, and a safety valve and a gas storage cavity are arranged in the installation groove. The safety valve comprises a valve cover and a valve core. A conical notch is formed at the bottom of the installation groove. An exhaust hole is formed at the bottom of the cover plate, and an air outlet hole is formed at the top of the cover plate. The interior of the sodium-ion battery is communicated with the installation groove through the exhaust hole. The valve cover is arranged at the upper part of the installation groove. A guiding groove is formed at the bottom of the valve cover. Exhaust channels are arranged on the left and right sides of the valve cover and are communicated with the air outlet hole at the top of the cover plate. The gas storage cavity is arranged below the valve cover, and the valve core is arranged at the center of the gas storage cavity and is movably connected with the valve cover.
[0007] Further, the valve cover is a composite cylinder composed of an upper cylindrical part and a lower cylindrical part, and the cross-section of the valve cover is in a T shape. Exhaust channels are arranged on the left and right sides of the upper cylindrical part of the valve cover, and an elastic valve is installed in the middle of the exhaust channels. A cylindrical guiding groove is formed in the lower cylindrical part of the valve cover from bottom to top. The upper part of the valve core is a cylinder, and the lower part is a cone. A spring is installed at the upper end of the valve core and is connected to the top of the guiding groove. The lower end of the valve core coincides with the conical notch at the bottom of the installation groove and is communicated with the exhaust hole at the bottom of the cover plate.
[0008] Further, the gas storage cavity is a hollow area formed between the bottom surface of the valve cover and the bottom surface of the installation groove, and the minimum depth of the gas storage cavity is less than the height of the valve core.
[0009] Further, the elastic valve is composed of two trapezoidal elastic blocks that are symmetric left and right. The depth of the guiding groove is less than the height of the lower cylindrical part of the valve cover and is not greater than the height of the valve core.
[0010] Further, the length of the elastic valve is the sum of the heights of the two trapezoidal elastic blocks, and the overall length of the elastic valve is greater than the diameter of the exhaust channel.
[0011] Further, the materials of the valve core and the elastic valve are one or more of nitrile rubber, styrene-butadiene rubber, fluororubber, ethylene-propylene rubber, and butyl rubber.
[0012] The utility model has the following beneficial effects:
[0013] When the battery generates gas, the gas is discharged from the exhaust hole in a timely manner. When the pressure reaches a certain value, the valve core will undergo elastic deformation and gradually separate from the conical notch. The gas will pass through the conical notch from the exhaust hole and be temporarily stored in the gas storage cavity, which can keep the internal pressure of the battery stable while preventing the overall sealing performance of the battery from deteriorating due to repeated direct discharge of internal gas. Further, when the pressure in the gas storage cavity is greater than the specified value, the gas will pass through the exhaust passage, push open the elastic valve, and then be released from the air outlet at the top to ensure that the battery does not bulge. After discharging the excess gas, the safety valve of the battery will immediately return to its original closed state to prevent the battery from leaking liquid, and this cycle repeats.
[0014] The safety valve of the sodium-ion battery described above has a very reasonable structural design and a recoverable function. It can control the internal pressure of the battery, discharge the excess gas inside the battery in a timely manner, prevent the leakage of the electrolyte inside the battery, and maintain the sealing performance of the battery, thereby effectively improving the safety and reliability of the sodium-ion battery and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic structural diagram of the present utility model.
[0016] In the drawings, 1 - cover plate, 2 - safety valve, 3 - installation groove, 4 - gas storage cavity, 5 - valve cover, 6 - valve core, 7 - conical notch, 8 - exhaust hole, 9 - air outlet, 10 - guide groove, 11 - exhaust passage, 12 - elastic valve, 13 - spring. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0017] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0018] Such as Figure 1As shown in the figure, an anti-gas expansion sodium-ion battery includes a sodium-ion battery cell, a housing, a cover plate 1, and a safety valve 2. A hemispherical installation groove 3 is formed in the cover plate 1, and a safety valve 2 and a gas storage cavity 4 are arranged in the installation groove 3. The safety valve 2 includes a valve cover 5 and a valve core 6. A conical notch 7 is formed at the bottom of the installation groove 3. An exhaust hole 8 is provided at the bottom of the cover plate 1, and an air outlet hole 9 is provided at the top. The interior of the sodium-ion battery communicates with the installation groove 3 through the exhaust hole 8. The valve cover 5 is arranged at the upper part of the installation groove 3 through a threaded connection. A guiding groove 10 is formed at the bottom of the valve cover 5. Exhaust channels 11 are arranged on both the left and right sides of the valve cover 5, and the exhaust channels 11 communicate with the air outlet hole 9 at the top of the cover plate 1. The gas storage cavity 4 is arranged below the valve cover 5, and the gas storage cavity 4 is a hollow area formed between the bottom surface of the valve cover 1 and the bottom surface of the installation groove 3, which can temporarily store the gas generated inside the battery. The valve core 6 is arranged at the center of the gas storage cavity 4 and is movably connected to the valve cover 5. The material of the valve core 6 is styrene-butadiene rubber, and the height of the valve core 6 is greater than the minimum depth of the gas storage cavity 4 to prevent the valve core 6 from having too large a movement range and making it difficult to accurately control the pressure inside the battery.
[0019] The valve cover 5 is an integrally composite cylinder composed of an upper cylindrical part and a lower cylindrical part, and the cross-section of the valve cover 5 is in a T shape. Exhaust channels 11 communicating with the gas storage cavity 4 are formed in the middle of both the left and right sides of the upper cylindrical part of the valve cover 5. An elastic valve 12 is movably installed at the center of the exhaust channels 11. The elastic valve 12 is composed of two trapezoidal elastic blocks that are symmetric about the left and right. The material of the trapezoidal elastic block is nitrile rubber. The length of the elastic valve 12 is the sum of the heights of the two trapezoidal elastic blocks, and the overall length of the elastic valve 12 is greater than the diameter of the exhaust channels 11. When the pressure in the gas storage cavity 4 rises to a certain value, the gas will gradually push the elastic valve 12 loose, and then the gas will be discharged from the gap in the elastic valve 12, pass through the exhaust channels 11, and finally be released from the air outlet hole 9. After the gas is released, the elastic valve 12 will immediately return to its original state to ensure the overall sealing of the battery.
[0020] A cylindrical guiding groove 10 is formed in the lower cylindrical part of the valve cover 5 from bottom to top. The depth of the guiding groove 10 is less than the height of the lower cylindrical part of the valve cover 5 and is not greater than the height of the valve core 6, which can reasonably limit the movement path of the valve core 6. The upper part of the valve core 6 is a cylinder, and the lower part is a cone. A spring 13 is installed at the upper end of the valve core 6 and is connected to the top of the guiding groove 10. The lower end of the valve core 6 fits with the conical notch 7 at the bottom of the installation groove 3 and communicates with the exhaust hole 8 at the bottom of the cover plate 1. When gas is generated inside the battery, the gas will push the valve core 6 to move upward slowly, and the lower end of the valve core 6 will gradually disengage from the conical notch 7, so that the gas is discharged from the inside of the battery into the gas storage cavity 4. Subsequently, the elastic force of the spring 13 and the elastic stress of the valve core 6 itself will reset the valve core 6 to ensure the stability of the pressure inside the battery.
[0021] The above are only the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. It should be pointed out that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present utility model should be regarded as within the protection scope of the present utility model. Each component not clearly defined in this embodiment can be implemented by using the prior art.
Claims
1. An anti-flatulence sodium ion battery, comprising a sodium ion battery cell, a housing, a cover plate, and a safety valve, characterized in that: A hemispherical mounting groove is provided on the cover plate, a safety valve and an air storage cavity are provided in the mounting groove, the safety valve comprises a valve cover and a valve core, a conical notch is provided at the bottom of the mounting groove, an exhaust hole is provided at the bottom of the cover plate, and an air outlet hole is provided at the top, and the interior of the sodium ion battery is connected with the mounting groove through the exhaust hole; the valve cover is arranged at the upper part of the mounting groove, a guide groove is provided at the bottom of the valve cover, exhaust channels are provided on the left and right sides of the valve cover, and the exhaust channels are connected with the air outlet hole at the top of the cover plate; the air storage cavity is arranged below the valve cover, and the valve core is arranged at the center of the air storage cavity and is movably connected with the valve cover.
2. The anti-flatulence sodium ion battery according to claim 1, characterized in that: The valve cover is a composite cylinder consisting of an upper cylindrical part and a lower cylindrical part, and the cross-section of the valve cover is T-shaped; exhaust channels are provided on the left and right sides of the upper cylindrical part of the valve cover, and an elastic valve is installed in the middle of the exhaust channel; a cylindrical guide groove is opened from bottom to top on the lower cylindrical part of the valve cover; the upper part of the valve core is a cylinder, and the lower part is a cone. A spring is installed on the upper end of the valve core and is connected to the top of the guide groove. The lower end of the valve core is consistent with the conical notch at the bottom of the installation groove, and is connected to the exhaust hole at the bottom of the cover plate.
3. The anti-flatulence sodium ion battery according to claim 1, characterized in that: The air storage cavity is a hollow area formed between the bottom surface of the valve cover and the bottom surface of the installation groove, and the minimum depth of the air storage cavity is less than the height of the valve core.
4. The anti-flatulence sodium ion battery according to claim 2, characterized in that: The elastic valve is composed of two trapezoidal elastic blocks that are symmetrical on both sides; the depth of the guide groove is less than the height of the cylindrical part under the valve cover and is not greater than the height of the valve core.
5. The anti-flatulence sodium ion battery according to claim 4, characterized in that: The length of the elastic valve is the sum of the heights of the two trapezoidal elastic blocks, and the overall length of the elastic valve is greater than the diameter of the exhaust passage.
6. The anti-flatulence sodium ion battery according to claim 2, characterized in that: The valve core and the elastic valve are made of one or more of nitrile rubber, styrene-butadiene rubber, fluororubber, ethylene-propylene rubber and butyl rubber.