Glass sealing tool for sodium-nickel battery

Abstract

The utility model discloses a glass sealing tool for a sodium-nickel battery, which belongs to the technical field of sodium-nickel battery preparation, and comprises a tool substrate and a sealing limiting mechanism, the sealing limiting mechanism comprises an isolation gasket and a limiting rod, and in the sealing process, the isolation gasket and the limiting rod are separated from each other. The ceramic tube and the hot-pressing sealing assembly can be fixed and limited through the isolation gasket and the limiting rod which are in a relatively fixed state, relative displacement between the ceramic tube and the hot-pressing sealing assembly is avoided, the glass sealing effect is ensured, meanwhile, the ceramic tube is supported through the limiting rod, and the situation that the ceramic tube topples over can be avoided; therefore, the sealing tool adopting the structure in the scheme not only can overcome the problems in the prior art and improve the sealing effect and quality, but also can improve the safety of the sealing process, and has certain practical value and market promotion value.

Description

Technical Field

[0001] This utility model belongs to the field of sodium-nickel battery manufacturing technology, and in particular relates to a glass sealing tooling for sodium-nickel batteries. Background Technology

[0002] Sodium-nickel batteries, also known as sodium salt batteries or sodium-nickel chloride batteries, are a type of high-temperature sodium battery. Their positive electrode is solid NiCl2, the negative electrode is liquid Na, and the electrolyte is solid β"-Al2O3 ceramic. During charging and discharging, sodium ions drift between the positive and negative electrodes through the ceramic electrolyte. It is a green product with strong stability, high safety, long service life, wide range of applications, readily available and non-toxic raw materials, and simple and pollution-free recycling process.

[0003] The β"-Al2O3 ceramic after glass sealing is the core component of the entire sodium-nickel battery. It mainly consists of two parts: (1) β"-Al2O3 ceramic tube; (2) thermo-pressed sealing assembly (TCB). The ceramic tube serves as the electrolyte separator between the positive and negative electrodes of the battery and is also the container for the melt. The TCB is mainly used to seal the β"-Al2O3 ceramic tube and serves as the key passage for the positive and negative electrodes to conduct in the entire battery. The TCB is mainly composed of α-ceramic rings and inner and outer nickel rings. Generally, the α-ceramic rings are metallized and then thermo-pressed to make the inner and outer nickel rings firmly attached to the fixed position of the ceramic rings, forming a complete TCB. The main function of CB (NiCl2) glass sealing is to connect TCB to the ceramic tube. The sealing and connecting material is mainly glass grease, which completely vitrifies at around 1000℃. During this process, it slowly seeps into the ceramic tube and α-ceramic ring in a liquid state, thus achieving the connection. The expulsion of pores in the glass grease also creates a dense sealing zone at the connection between the TCB and the ceramic tube, achieving a sealing effect. Because nickel rings are easily oxidized at high temperatures, inert gas needs to be introduced during the heating process for protection. Simultaneously, the working space must be as small as possible to ensure gas stability and purity. Therefore, sintering kilns with small spaces and continuous production capabilities, such as roller kilns or pusher kilns, are generally used.

[0004] In the entire glass sealing process, the movement of the pusher plate will generate vibration, and the pushing process will have a certain impulse. This can easily cause relative displacement between the ceramic tube and the TCB. If a gap is generated, not only will the glass paste fail to make the two tightly connected, but it may even cause the ceramic tube to collapse and cause the furnace to jam. In response to this process risk, this utility model designs a new type of glass sealing fixture for sodium-nickel batteries. Utility Model Content

[0005] The purpose of this invention is to provide a glass sealing fixture for sodium-nickel batteries to solve the risks of ceramic tube collapse and loose glass sealing between the ceramic tube and TCB in traditional glass sealing processes.

[0006] To address the aforementioned issues, this solution provides a glass sealing fixture for sodium-nickel batteries, comprising a fixture substrate. The upper surface of the fixture substrate is planar, and multiple sets of sealing limiting mechanisms are equidistantly distributed on it. Each sealing limiting mechanism includes an isolation washer and a limiting rod. The isolation washer supports the thermo-sealing assembly, and the limiting rod is coaxially arranged with the isolation washer and extends vertically. The diameter of the limiting rod is smaller than the inner diameter of the ceramic tube, which limits the ceramic tube fitted onto it and ensures that the ceramic tube is connected to the thermo-sealing assembly.

[0007] As a preferred embodiment of this application: the sealing and limiting mechanism is fixed on the tooling base plate by an mounting member, which is a sleeve connecting the tooling base plate and the sealing and limiting mechanism, or the mounting member is a plug-in component disposed on the tooling base plate.

[0008] As a preferred embodiment of this application: one end of the sleeve fitting is fixed on the tooling base plate, and the other end is connected to the isolation washer by plug-in or screw connection; the plug-in component includes a blind hole opened on the tooling base plate and a slot surrounding the blind hole, the size of the blind hole is adapted to the limiting rod, and the size of the slot is adapted to the isolation washer.

[0009] As a preferred embodiment of this application: the blind hole is a cylindrical hole, and the outer edges of the blind hole and the slot are respectively chamfered.

[0010] As a preferred embodiment of this application: after the isolation gasket is installed in the slot, its upper end face is higher than the upper surface of the tooling substrate.

[0011] As a preferred embodiment of this application: the isolation gasket is a hollow ring structure, the size of the hollow cavity of the ring structure is larger than the diameter of the limiting rod, and the hollow cavity is provided with a radially extending protrusion, which forms a limiting groove with the inner wall of the upper end of the hollow cavity, and the hot-press sealing assembly can be inserted into the limiting groove.

[0012] As a preferred embodiment of this application, the bottom surfaces at both ends of the limiting rod are rounded.

[0013] As a preferred embodiment of this application, the height of the limiting rod is greater than or equal to 1 / 3 of the height of the ceramic tube.

[0014] As a preferred embodiment of this application, the tooling substrate and the sealing and limiting mechanism are both made of inorganic non-metallic materials or composite materials with high hardness, high wear resistance, high temperature resistance and chemical stability.

[0015] Compared with existing technologies, the advantages of this application are:

[0016] This solution designs a sealing fixture for encapsulating ceramic tubes and thermopressing sealing components. The fixture includes a substrate and multiple sealing limiting mechanisms fixed thereon. Each sealing limiting mechanism includes an isolation gasket and a limiting rod. During use, the thermopressing sealing component is placed on the isolation gasket, and glass paste is pre-applied to its upper end to form a glass sealing area. Then, the ceramic tube is fitted onto the limiting rod, ensuring its end aligns with the glass sealing area of ​​the thermopressing sealing component. During sealing, the relatively fixed isolation gasket and limiting rod fix and limit the ceramic tube and thermopressing sealing component, preventing relative displacement and ensuring a good glass sealing effect. Simultaneously, the limiting rod supports the ceramic tube, preventing it from tipping over. Therefore, this sealing fixture not only overcomes the problems of existing technologies and improves sealing effect and quality but also enhances the safety of the sealing process, possessing practical and market value. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the glass sealing fixture for sodium-nickel batteries provided by this utility model.

[0018] Figure 2 This is a schematic diagram of the main structure of the tooling substrate provided by this utility model.

[0019] Figure 3 This utility model provides Figure 2 A schematic diagram of the cross-sectional structure along the AA direction.

[0020] Figure 4 This utility model provides Figure 2 A schematic diagram of the cross-sectional structure along the BB direction.

[0021] Figure 5 This is an enlarged cross-sectional view of the connector provided by this utility model.

[0022] Figure 6 This utility model provides Figure 2 A magnified view of a portion of point C.

[0023] Figure 7 This is a schematic diagram of the overall structure of the isolation gasket provided by this utility model.

[0024] Figure 8 This is a top view of the isolation gasket provided by this utility model.

[0025] Figure 9 This utility model provides Figure 8 A schematic diagram of the cross-sectional structure along the CC direction.

[0026] Figure 10This is a schematic diagram of the main structure of the limiting rod provided by this utility model.

[0027] Figure 11 This is a side view of the limiting rod provided by this utility model.

[0028] Figure Labels

[0029] 10 is the tooling substrate; 101 is the blind hole; 102 is the slot; 20 is the isolation washer; 21 is the limiting groove; 30 is the limiting rod. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be emphasized that the following description is merely exemplary and not intended to limit the scope and application of the present invention.

[0031] like Figure 1 The diagram shown is a schematic representation of the overall structure of a glass sealing fixture for sodium-nickel batteries provided in this embodiment. The sealing fixture includes a fixture substrate 10 and multiple sets of sealing limiting mechanisms. The fixture substrate 10 is a rectangular plate highly compatible with the glass sealing process of sodium-nickel batteries, with chamfered corners on all four sides. Figure 2 As shown, the upper and lower surfaces of the rectangular plate are both planar structures. Multiple sets of sealing and limiting mechanisms are evenly and equidistantly distributed on the upper surface of the rectangular plate. It can be understood that, as needed, the multiple sets of sealing and limiting structures can be fixed to the tooling base plate 10 by welding or screwing, or can be installed on the tooling base plate 10 in a pluggable manner. The sealing and limiting mechanism includes an isolation washer 20 and a limiting rod 30. The isolation washer 20 is used to support the hot-press sealing assembly; that is, the hot-press sealing assembly is placed on the isolation washer 20. This embodiment specifically… To achieve this, the hot-press sealing assembly is placed on the isolation gasket 20, and glass grease is pre-applied to its upward end to form a glass sealing area. The limiting rod 30 is coaxially arranged with the isolation gasket 20 and extends vertically. The diameter of the limiting rod 30 is smaller than the inner diameter of the isolation gasket 20 to limit the ceramic tube fitted on it and ensure that the ceramic tube is connected to the hot-press sealing assembly. Specifically, the ceramic tube is inverted and fitted onto the limiting rod 30, and the sealing port of the ceramic tube is connected to the glass sealing area of ​​the hot-press sealing assembly to achieve glass sealing.

[0032] The specific operating principle of this embodiment includes: during the glass sealing process, the isolation gasket 20 and the limiting rod 30, which are in a relatively fixed state, can fix and limit the ceramic tube and the hot-press sealing assembly, avoiding relative displacement between the ceramic tube and the hot-press sealing assembly, thus ensuring the glass sealing effect. At the same time, the limiting rod 30 supports the ceramic tube, preventing it from tipping over. It can be seen that the sealing fixture with this structure can not only overcome the problems existing in the prior art and improve the sealing effect and quality, but also improve the safety of the sealing process, thus having certain practical value and market promotion value.

[0033] In this embodiment, multiple sealing and limiting structures are installed on the tooling substrate 10 in a pluggable manner. Specifically, the sealing and limiting mechanism is fixed to the tooling substrate 10 by a mounting component, which is either a sleeve connecting the tooling substrate 10 and the sealing and limiting mechanism, or a plug-in component disposed on the tooling substrate 10. When it is a sleeve, one end of the sleeve is fixed to the tooling substrate 10, and the other end is connected to the isolation washer 20 by plugging or screwing. The limiting rod 30 is fixed by plugging into the isolation washer 20, or the limiting rod 30 passes through the isolation washer 20 and is plugged into the sleeve. When it is a plug-in component, the plug-in component includes a blind hole 101 opened on the tooling substrate 10 and a slot 102 surrounding the blind hole 101. Figure 3-5 As shown, the dimensions of the blind hole 101 are adapted to the limiting rod 30 for fixing the limiting rod 30. Figure 6 The diagram shows the positional relationship between multiple adjacent connectors. The size of the slot 102 is adapted to the isolation washer 20 to fix the isolation washer 20. The limiting rod 30 passes through the isolation washer 20 and is inserted into the blind hole 101. In this embodiment, the blind hole 101 is a columnar hole, and the outer edges of the blind hole 101 and the slot 102 are respectively chamfered.

[0034] The tooling substrate 10 and the sealing limiting mechanism are both made of inorganic non-metallic materials or composite materials with high hardness, high wear resistance, high temperature resistance and chemical stability. Specifically, they can be either silicate ceramics or alumina ceramics. In this embodiment, the tooling substrate 10 is preferably made of cordierite, a silicate ceramic, and the sealing limiting mechanism is made of 99% alumina ceramic. It can be seen that the tooling in this solution is hard and has good high temperature resistance (1200℃), which meets the requirements of the sodium-nickel battery glass sealing process.

[0035] like Figure 7-9The diagram shows the structure of the isolation gasket 20 provided in this embodiment. The isolation gasket 20 is a hollow annular structure. The size of the hollow cavity of the annular structure is larger than the diameter of the limiting rod 30, and a radially extending protrusion is provided inside the hollow cavity. It is understood that the design of the protrusion should not affect the normal insertion of the limiting rod 30. The protrusion and the inner wall of the upper end of the hollow cavity form a limiting groove 21. The size of the limiting groove 21 is adapted to the hot-press sealing assembly. The hot-press sealing assembly can be inserted into the limiting groove 21 for limiting and fixing, avoiding displacement and further improving the sealing quality. The depth of the limiting groove 21 is preferably about 1 cm to limit the hot-press sealing assembly. The specific depth can be set according to actual needs.

[0036] The bottom surfaces of both ends of the limiting rod 30 are rounded to avoid damage to the inside of the ceramic tube. Figure 10-11 As shown, the height of the limiting rod 30 is greater than or equal to 1 / 3 of the height of the ceramic tube, so as to support the ceramic tube and prevent it from tipping over.

[0037] In this embodiment, after the isolation gasket 20 is installed in the slot 102, its upper end surface is 5-15mm higher than the upper surface of the tooling substrate 10. This structure can increase the height of the glass sealing area of ​​the hot-press sealing assembly relative to the tooling substrate 10, avoid friction and scratching between the hot-press sealing assembly and the tooling substrate 10, and thus avoid the phenomenon of insufficient paste or leakage.

[0038] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various improvements without departing from this utility model, and these improvements should also be considered within the scope of protection of this utility model. These improvements will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of the claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A glass sealing fixture for sodium-nickel batteries, characterized in that: The device includes a tooling substrate with a planar upper surface and multiple sets of sealing and limiting mechanisms evenly distributed on it. Each sealing and limiting mechanism includes an isolation gasket and a limiting rod. The isolation gasket is used to support the thermo-sealing assembly. The limiting rod is coaxially arranged with the isolation gasket and extends vertically. The diameter of the limiting rod is smaller than the inner diameter of the isolation gasket to limit the ceramic tube fitted on it and ensure that the ceramic tube is connected to the thermo-sealing assembly placed on the isolation gasket.

2. The glass sealing fixture for sodium-nickel batteries according to claim 1, characterized in that: The sealing and limiting mechanism is fixed on the tooling base plate by an installation component, which is a sleeve connecting the tooling base plate and the sealing and limiting mechanism, or the installation component is a plug-in component disposed on the tooling base plate.

3. The glass sealing fixture for sodium-nickel batteries according to claim 2, characterized in that: One end of the sleeve fitting is fixed on the tooling base plate, and the other end is connected to the isolation washer by plug-in or screw connection; the plug-in component includes a blind hole opened on the tooling base plate and a slot surrounding the blind hole, the size of the blind hole is adapted to the limiting rod, and the size of the slot is adapted to the isolation washer.

4. The glass sealing fixture for sodium-nickel batteries according to claim 3, characterized in that: The blind hole is a cylindrical hole, and the outer edges of the blind hole and the slot are respectively chamfered.

5. The glass sealing fixture for sodium-nickel batteries according to claim 3, characterized in that: After the isolation gasket is installed in the slot, its upper surface is higher than the upper surface of the tooling substrate.

6. The glass sealing fixture for sodium-nickel batteries according to claim 1, characterized in that: The isolation gasket is a hollow ring structure. The size of the hollow cavity of the ring structure is larger than the diameter of the limiting rod. The hollow cavity is provided with a radially extending protrusion. The protrusion and the inner wall of the upper end of the hollow cavity form a limiting groove. The hot-press sealing assembly can be inserted into the limiting groove.

7. The glass sealing fixture for sodium-nickel batteries according to claim 1, characterized in that: The bottom surfaces at both ends of the limiting rod are rounded.

8. The glass sealing fixture for sodium-nickel batteries according to claim 1, characterized in that: The height of the limiting rod is greater than or equal to 1 / 3 of the height of the ceramic tube.

9. The glass sealing fixture for sodium-nickel batteries according to claim 1, characterized in that: The tooling substrate and sealing limiting mechanism are both made of inorganic non-metallic materials or composite materials with high hardness, high wear resistance, high temperature resistance and chemical stability.

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