Explosion-proof steel shell structure for cylindrical sodium battery

Abstract

The utility model relates to an explosion-proof steel shell structure for a cylindrical sodium battery, which comprises a battery shell, the top end of the battery shell is provided with a pressure relief hole, a pressure relief cavity is arranged in the pressure relief hole, the bottom end in the pressure relief cavity is connected with a heat absorption pipe, a closing valve is arranged in the pressure relief cavity in a sliding manner, and the bottom end of the closing valve extends downwards to form a sliding rod; a lower pushing pipe is arranged in the heat absorption pipe, the bottom end of the sliding rod is inserted into the lower pushing pipe, a sliding valve plate is arranged at the bottom end in the lower pushing pipe, and the sliding valve plate is fixedly connected with the bottom end of the sliding rod. The utility model relates to the technical field of explosion-proof shells of sodium batteries. According to the explosion-proof steel shell structure for the cylindrical sodium battery, the interior of the battery shell is communicated with the outside through retraction of the closing valve towards the interior of the battery shell, so that the effect of exhausting air is achieved, and the problem that the closing valve is shielded by an external structure can be effectively avoided; and high voltage in the battery shell can be quickly discharged.

Description

Technical Field

[0001] This utility model relates to the technical field of explosion-proof housings for sodium batteries, and in particular to an explosion-proof steel housing structure for cylindrical sodium batteries. Background Technology

[0002] Sodium batteries are a type of rechargeable battery that primarily functions by the movement of sodium ions between the positive and negative electrodes. The explosion-proof valve of a conventional cylindrical sodium battery is typically located at the positive electrode, specifically on the positive electrode cover. This valve ruptures when the internal pressure of the battery becomes excessively high, releasing the high-pressure gas and reducing the internal pressure to prevent an explosion.

[0003] In existing technologies, most sodium battery explosion-proof valves are achieved by the temperature and pressure inside the battery casing breaking through or lifting the explosion-proof valve. However, when the explosion-proof valve is pushed out, it is easy to cause the explosion-proof valve to be difficult to be completely pushed out due to the structural limitations of the external battery compartment. This results in a slower outflow rate of high-pressure gas inside the battery, making it difficult to discharge in time and causing the battery to explode. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an explosion-proof steel shell structure for cylindrical sodium batteries, so as to solve the technical problems mentioned in the background art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] An explosion-proof steel shell structure for cylindrical sodium batteries includes:

[0007] The battery casing has a pressure relief hole at its top, a pressure relief chamber inside the pressure relief hole, a heat absorption tube connected to the bottom of the pressure relief chamber, a sealing valve slidably installed inside the pressure relief chamber, a sliding rod extending downward from the bottom of the sealing valve, a push tube inside the heat absorption tube, the bottom of the sliding rod inserted into the push tube, a sliding valve plate at the bottom of the push tube, and the sliding valve plate fixedly connected to the bottom of the sliding rod.

[0008] The top of the heat absorber tube is equipped with a gas guiding component, which is used to guide the pressure inside the heat absorber tube into the lower push tube.

[0009] Furthermore, the air guiding assembly includes:

[0010] A retaining ring is fitted onto the top of the outer peripheral wall of the lower push tube and is fixedly connected to the inner wall of the heat absorption tube.

[0011] The top of the fixed ring is provided with several connecting tubes, and the top of the connecting tubes are connected to an air guide cap, which is fixedly connected to the lower push tube.

[0012] Furthermore, a through hole is provided at the center of the air guide cap for the sliding rod to pass through, and a sealing ring is provided on the wall of the through hole.

[0013] Furthermore, the outer peripheral wall of the heat-absorbing tube is provided with multiple embedded grooves to increase the contact area between the heat-absorbing tube and the air inside the battery casing.

[0014] Furthermore, the cavity wall of the pressure relief chamber is provided with several exhaust grooves, the thickness of the sealing valve is greater than the height of the exhaust grooves, the part of the pressure relief chamber located inside the battery casing is provided with a venting groove, and the battery casing is provided with a bottom through groove at the position corresponding to the venting groove.

[0015] Furthermore, the upper edge of the pressure relief hole is set with an inclined surface, and several fan-shaped grooves are opened on the top shell wall of the battery casing, and the ends of the fan-shaped grooves correspond one-to-one with the positions of the exhaust grooves.

[0016] In summary, this utility model has at least one of the following beneficial technical effects:

[0017] 1. The explosion-proof steel shell structure for cylindrical sodium batteries uses a closed valve to retract into the battery shell, thereby connecting the inside of the battery shell with the outside and venting air. This effectively avoids the problem of external structures blocking the closed valve and allows the high pressure inside the battery shell to be released quickly.

[0018] 2. The explosion-proof steel shell structure for cylindrical sodium batteries features a pressure relief hole on an inclined surface. When gas is ejected from the exhaust vent, the inclined surface guides the hot air initially, ensuring sufficient dispersion of the discharged gas and preventing heat accumulation that could ignite the external structure. Furthermore, the fan-shaped groove further guides the ejected gas, achieving a further dispersion of the high-pressure, high-heat gas. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an explosion-proof steel shell structure for a cylindrical sodium battery according to the present invention.

[0021] Figure 2 This is a schematic diagram of the fan-shaped groove in an explosion-proof steel shell structure for cylindrical sodium batteries according to this utility model.

[0022] Figure 3This is a schematic diagram of the internal structure of an explosion-proof steel shell structure for a cylindrical sodium battery according to the present invention.

[0023] Figure 4 This is a schematic diagram of the gas-conducting component of an explosion-proof steel shell structure for cylindrical sodium batteries according to the present invention.

[0024] Figure 5 This is a schematic diagram of the bottom through groove and pressure relief chamber of an explosion-proof steel shell structure for a cylindrical sodium battery according to the present invention.

[0025] In the diagram, 1 is the battery casing; 2 is the pressure relief hole; 3 is the pressure relief chamber; 4 is the heat absorption pipe; 5 is the sealing valve; 6 is the sliding rod; 7 is the push tube; 8 is the sliding valve plate; 9 is the gas guide assembly; 91 is the fixing ring; 92 is the connecting pipe; 93 is the gas guide cap; 94 is the through hole; 10 is the exhaust groove; 11 is the fan-shaped groove; and 12 is the bottom through groove. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] Example:

[0028] Reference Figures 1-5 This utility model discloses an explosion-proof steel shell structure for cylindrical sodium batteries, comprising:

[0029] The battery casing 1 has a pressure relief hole 2 at its top. The pressure relief hole 2 has a pressure relief chamber 3 inside. The bottom of the pressure relief chamber 3 is connected to a heat absorption tube 4. A sealing valve 5 is slidably installed inside the pressure relief chamber 3. A sliding rod 6 extends downward from the bottom of the sealing valve 5. A push tube 7 is installed inside the heat absorption tube 4. The bottom of the sliding rod 6 is inserted into the push tube 7. A sliding valve plate 8 is installed at the bottom of the push tube 7. The sliding valve plate 8 is fixedly connected to the bottom of the sliding rod 6.

[0030] The top end of the heat absorption tube 4 is provided with a gas guiding component 9, which is used to guide the pressure inside the heat absorption tube 4 into the lower push tube 7.

[0031] In this embodiment, because the existing battery explosion-proof valve is easily restricted by the structure of the external battery compartment when it is pushed out, the valve is difficult to push out completely, resulting in a slow outflow rate of high-pressure gas inside the battery, which is difficult to discharge in time and causes the battery to explode. In order to change this situation, the following technical solution is proposed in this embodiment:

[0032] like Figure 4As shown, when overheating occurs inside the battery casing 1, the heat absorption pipe 4 first absorbs the heat inside the battery casing 1. At this time, the evaporation medium inside the heat absorption pipe 4 evaporates, and high-pressure gas is formed inside the heat absorption pipe 4. This high-pressure gas is discharged upward through the gas guide assembly 9 to the upper end of the lower push pipe 7. As the pressure continues to rise, the high-pressure gas pushes the sliding valve plate 8 inside the lower push pipe 7 downward and pulls the closing valve 5 downward through the sliding rod 6, so that the exhaust groove 10 and the bottom through groove 12 are connected to each other through the pressure relief chamber 3. At this time, the external air pressure can be discharged through the pressure relief groove.

[0033] In summary, by retracting the sealing valve 5 into the battery casing 1, the interior of the battery casing 1 is connected to the outside, thereby achieving the effect of air discharge. This effectively avoids the problem of external structures blocking the sealing valve 5, allowing the high pressure inside the battery casing 1 to be discharged quickly.

[0034] In a further preferred embodiment of this utility model, such as Figure 4 As shown, the air guiding assembly 9 includes:

[0035] The fixing ring 91 is sleeved on the top of the outer peripheral wall of the push tube 7 and is fixedly connected to the inner wall of the heat absorption tube 4.

[0036] The top end of the fixing ring 91 is provided with several connecting tubes 92, and the top end of the connecting tubes 92 are connected to the air guide cap 93. The air guide cap 93 is fixedly connected to the lower push tube 7.

[0037] In this embodiment, the heat absorption pipe 4 and the connecting pipe 92 are connected to each other by the fixing ring 91, and the connecting pipe 92 is connected to the lower push pipe 7 by the setting of the air guide cap 93. At this time, the heat absorption pipe 4 is connected to the lower push pipe 7 through the connecting pipe 92. Therefore, when the evaporation medium inside the heat absorption pipe 4 absorbs heat and evaporates to generate high-pressure air, the high-pressure air can enter the upper part of the lower push pipe 7 through the connecting pipe 92 and push the sliding valve plate to move downward, so as to push the closing valve 5 to move downward to the bottom side of the bottom channel 12.

[0038] In a further preferred embodiment of this utility model, such as Figure 4 As shown, the air guide cap 93 has a through hole 94 at its axis for the sliding rod 6 to pass through, and the hole wall of the through hole 94 is provided with a sealing ring.

[0039] In this embodiment, the through hole 94 is provided for the sliding rod 6 to pass through, and the sealing ring is provided to prevent air leakage when high-pressure air enters the cavity between the air guide cap 93 and the lower push tube 7.

[0040] In a further preferred embodiment of this utility model, such as Figure 3 As shown, the outer peripheral wall of the heat absorption tube 4 is provided with multiple embedded grooves to increase the contact area between the heat absorption tube 4 and the air inside the battery casing 1.

[0041] In this embodiment, the embedded groove on its surface can increase the contact area between the heat absorption tube 4 and the air inside the battery casing 1. When the inside of the battery casing 1 is overheated, it can absorb heat and evaporate the medium inside the heat absorption tube 4, thereby triggering the sealing valve 5 to achieve the effect of pressure relief.

[0042] In a further preferred embodiment of this utility model, such as Figure 2 and Figure 5 As shown, the cavity wall of the pressure relief chamber 3 is provided with a plurality of exhaust grooves 10, the thickness of the sealing valve 5 is greater than the height of the exhaust grooves 10, the part of the pressure relief chamber 3 located inside the battery casing 1 is provided with an air guide groove, and the battery casing 1 is provided with a bottom through groove 12 at the position corresponding to the air guide groove.

[0043] In this embodiment, after the heat and pressure inside the battery casing increase, the medium inside the evaporation heat absorption tube 4 causes the sealing valve 5 to move downward until the sealing valve 5 moves downward to the bottom of the air guide groove. At this time, the bottom through groove 12 is connected to the pressure relief chamber 3 through the air guide groove. At this time, the high pressure gas inside the battery casing can enter the interior of the pressure relief chamber 3 through the bottom through groove 12 and the air guide groove, and be discharged through the exhaust groove 10, thereby achieving the purpose of venting the gas. Under normal conditions, the side wall of the sealing valve 5 corresponds to the air guide groove.

[0044] In a further preferred embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the upper edge of the pressure relief hole 2 is set with an inclined surface, and several fan-shaped grooves 11 are opened on the top shell wall of the battery casing 1, and the ends of the fan-shaped grooves 11 correspond one-to-one with the positions of the exhaust grooves 10.

[0045] In this embodiment, the pressure relief hole 2 provided on the inclined surface can guide the hot air through the inclined surface when the gas is ejected from the exhaust groove 10, so that the gas is sufficiently dispersed and the heat is prevented from accumulating and igniting the external setting. Furthermore, the fan-shaped groove 11 is provided to further guide the ejected gas, thereby further dispersing the ejected high-pressure and high-heat gas.

[0046] The implementation principle of the above embodiment is as follows: When overheating occurs inside the battery casing 1, the heat absorption pipe 4 first absorbs the heat inside the battery casing 1. At this time, the evaporation medium inside the heat absorption pipe 4 evaporates, and high-pressure gas is formed inside the heat absorption pipe 4. This high-pressure gas is discharged upward through the gas guide assembly 9 to the upper end of the lower push pipe 7. As the pressure continues to rise, the high-pressure gas pushes the sliding valve plate 8 inside the lower push pipe 7 to move downward, and pulls the closing valve 5 downward through the sliding rod 6, so that the exhaust groove 10 and the bottom through groove 12 are connected to each other through the pressure relief chamber 3. At this time, the external air pressure can be discharged through the pressure relief groove.

[0047] The sealing valve 5 retracts into the battery casing 1, thereby connecting the inside of the battery casing 1 with the outside and venting air. This effectively prevents external structures from obstructing the sealing valve 5 and allows the high pressure inside the battery casing 1 to be released quickly.

[0048] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. An explosion-proof steel shell structure for cylindrical sodium batteries, characterized in that, Including: The battery casing (1) has a pressure relief hole (2) at its top. The pressure relief hole (2) has a pressure relief chamber (3) inside. The bottom of the pressure relief chamber (3) is connected to a heat absorption tube (4). A sealing valve (5) is slidably installed inside the pressure relief chamber (3). A sliding rod (6) extends downward from the bottom of the sealing valve (5). A push tube (7) is installed inside the heat absorption tube (4). The bottom of the sliding rod (6) is inserted into the push tube (7). A sliding valve plate (8) is installed at the bottom of the push tube (7). The sliding valve plate (8) is fixedly connected to the bottom of the sliding rod (6). The top end of the heat absorption tube (4) is provided with a gas guiding component (9) for guiding the pressure inside the heat absorption tube (4) into the push tube (7).

2. The explosion-proof steel shell structure for a cylindrical sodium battery according to claim 1, characterized in that, The air guiding assembly (9) includes: A fixing ring (91) is sleeved on the top of the outer peripheral wall of the push tube (7) and is fixedly connected to the inner wall of the heat absorption tube (4); The top end of the fixing ring (91) is provided with several connecting tubes (92), and the top end of the connecting tubes (92) is connected to the air guide cap (93). The air guide cap (93) is fixedly connected to the push tube (7).

3. The explosion-proof steel shell structure for a cylindrical sodium battery according to claim 2, characterized in that, The air guide cap (93) has a through hole (94) at its axis for the sliding rod (6) to pass through, and the hole wall of the through hole (94) is provided with a sealing ring.

4. The explosion-proof steel shell structure for a cylindrical sodium battery according to claim 3, characterized in that, The outer peripheral wall of the heat absorption tube (4) is provided with multiple embedded grooves to increase the contact area between the heat absorption tube (4) and the air inside the battery casing (1).

5. The explosion-proof steel shell structure for a cylindrical sodium battery according to claim 4, characterized in that, The pressure relief chamber (3) has several exhaust grooves (10) on its wall. The thickness of the sealing valve (5) is greater than the height of the exhaust grooves (10). The part of the pressure relief chamber (3) located inside the battery casing (1) has an air guide groove, and the battery casing (1) has a bottom through groove (12) at the position corresponding to the air guide groove.

6. The explosion-proof steel shell structure for a cylindrical sodium battery according to claim 5, characterized in that, The upper edge of the pressure relief hole (2) is set with an inclined surface, and several fan-shaped grooves (11) are opened on the top shell wall of the battery casing (1), and the ends of the fan-shaped grooves (11) correspond one-to-one with the positions of the exhaust grooves (10).

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