Box body for high-temperature sodium battery

Abstract

The utility model discloses a box body for a high-temperature sodium battery, which belongs to the technical field of battery assembly and is characterized in that a box body comprises a peripheral plate and a bottom plate, a plurality of groups of hollow bosses are arranged on the bottom plate, and a plurality of through holes are formed in bodies of the hollow bosses and / or joints of the hollow bosses and the bottom plate. On one hand, the battery can be prevented from being in contact with the bottom plate, so that heat dissipation is facilitated, the battery is not prone to being in contact with outflow electrolyte, on the other hand, the flow guide channel is formed, when the electrolyte leaks due to the fact that the ceramic tube is broken, the leaked electrolyte can be led out through the through hole, and the phenomenon that the battery is short-circuited or overheated due to the fact that the electrolyte is accumulated in the box body is avoided; therefore, the box body adopting the structure not only can effectively dredge the outflow electrolyte, but also is beneficial to heat dissipation and avoid the contact between the battery and the electrolyte, meanwhile, the weight of the box body can be reduced, the effect of a reinforcing rib can be achieved, and the defects of the box body in the prior art are overcome.

Description

Technical Field

[0001] The utility model belongs to the technical field of high-temperature sodium battery assembly, in particular to a box body for a high-temperature sodium battery. Background Art

[0002] Sodium-sulfur batteries and sodium salt batteries have the advantages of high safety, high specific energy, high charge and discharge efficiency, and low cost. Both battery systems are excellent electrochemical energy storage power sources.

[0003] Both sodium-sulfur batteries and sodium salt batteries are high-temperature batteries. When assembling the batteries, it is necessary to consider an external box made of high-temperature resistant material as a carrier. The external box is mainly used to encapsulate and protect the battery.

[0004] At present, the boxes for sodium-sulfur and sodium salt batteries generally adopt simple sheet metal structures or are made of inorganic mica plates, which have no advantages in mechanical strength and rigidity. In addition, when the ceramic tube of the high-temperature sodium battery ruptures and causes electrolyte leakage, the box with this structure cannot drain the electrolyte in time, causing the electrolyte to accumulate in the box, which can easily cause battery short circuit or overheating, and further cause dangerous events such as battery fire or explosion.

[0005] Based on the above analysis, designing a box that is high in strength, lightweight and capable of timely draining leaked electrolyte is a technical problem that needs to be urgently solved in this application. Summary of the invention

[0006] The utility model aims to provide a box for a high-temperature sodium battery, so as to solve the problem that the existing box for a sodium battery cannot guide the leaked electrolyte.

[0007] In order to solve the above problems, the present application provides a box for high-temperature sodium batteries, including a box body, the box body includes an outer plate and a bottom plate, the outer plate is fixed to the bottom plate, the upper surface of the bottom plate is provided with a plurality of groups of hollow bosses, and a plurality of through holes are provided on the body of the hollow boss and / or at the connection between the hollow boss and the bottom plate, and the number of the hollow bosses corresponds to the maximum number of the high-temperature sodium batteries that can be installed in the box.

[0008] As a preferred solution of the present application, the hollow boss is a frustum structure, and the size of its upper end surface is larger than the size of the high-temperature sodium battery and its docking surface.

[0009] As a preferred solution of the present application, the hollow boss is a cylindrical frustum structure, and the outer circumference of the hollow boss is provided with multi-level flanges, that is, the outer edge of the longitudinal section of the hollow boss is a multi-level stepped structure.

[0010] As a preferred solution of the present application, a wire is provided on the peripheral plate, one end of the wire extends into the box body, and the other end of the wire extends to the outside of the box body for external detection of the insulation status of the battery pack.

[0011] As a preferred solution of the present application, the hollow boss is an independent structure, which is welded to the base plate, or the hollow boss and the base plate are integrally formed by punching.

[0012] As a preferred solution of the present application, the outer plate is formed by bending an integral plate.

[0013] As a preferred solution of the present application, the base plate includes multiple models, and a specified number of the hollow bosses are provided on the base plate of each model.

[0014] Compared with the prior art, the advantages of the box for high-temperature sodium batteries of the present application are: the present application sets a plurality of groups of hollow bosses on the bottom plate, and opens a plurality of through holes on the main body of the hollow boss and / or at the connection between the hollow boss and the bottom plate. By setting the hollow bosses and the through holes, on the one hand, the contact between the battery and the bottom plate can be avoided, which is beneficial to heat dissipation and not easy to contact with the outflowing electrolyte. On the other hand, a diversion channel is formed. When the ceramic tube ruptures and causes the electrolyte to leak out, the leaked electrolyte can be led out through the through holes to avoid accumulation in the box, causing the battery to short-circuit or overheat. That is, the box of the structure of the present application can not only effectively guide the outflowing electrolyte to avoid accumulation, but also help to dissipate heat and avoid contact between the battery and the electrolyte. At the same time, it can also reduce the weight of the box and play the role of reinforcing ribs, so that it meets the lightweight requirements while not reducing the strength, solves the shortcomings of the box in the prior art, and improves the battery performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of a box for a high-temperature sodium battery provided by the utility model.

[0016] Figure 2 This is a perspective structural schematic diagram of a box for a high-temperature sodium battery provided by the utility model.

[0017] Figure 3 Provided for the utility model Figure 2 A partial enlarged schematic diagram of the hollow boss at A in the middle.

[0018] Figure 4 This is a structural schematic diagram of a battery installed in a box provided by the utility model.

[0019] Figure 5 The utility model provides Figure 4 A local enlarged schematic diagram of point B in the middle.

[0020] Reference numerals

[0021] 1 is the box body, 2 is the outer plate, 3 is the bottom plate, 4 is the hollow boss, 41 is the opening A, 42 is the opening B, 5 is the wire, and 6 is the high-temperature sodium battery. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with specific implementations and with reference to the accompanying drawings. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope of the present invention and its application.

[0023] like Figure 1-2 As shown, it is a schematic diagram of the structure of a box body for high-temperature sodium batteries provided in this embodiment, including a box body 1 with an open upper end, the box body 1 includes an outer plate 2 and a bottom plate 3, and the outer plate 2 is fixed to the bottom plate 3 by welding or the like. It can be understood that the structure of the box body 1 can be a rectangular or other polygonal structure, and the specific size is determined according to the shape, size and quantity of the battery pack, which is not limited in detail in this embodiment.

[0024] In the present embodiment, the box body 1 is preferably a rectangular structure, and the outer plate 2 of the box body 1 is preferably formed by bending an integral plate, and the integral plate is preferably a 304 stainless steel plate with a thickness of 0.55-0.65mm. Compared with the existing boxes formed by splicing and assembly, the strength and rigidity of the box in the present embodiment are more guaranteed; the bottom plate 3 is also made of a 304 stainless steel plate with a thickness of 0.55-0.65mm, and a plurality of groups of hollow bosses 4 are provided on its upper surface, and a plurality of through holes are provided on the body of the hollow boss 4 and / or at the connection between the hollow boss 4 and the bottom plate 3. In the present embodiment, the through holes preferably include an opening A41 provided at the upper end of the hollow boss 4 body and an opening B42 provided at the connection between the hollow boss 4 body and the bottom plate 3, such as Figure 3 As shown, the size of the opening A41 is larger than the size of the opening B42. The purpose of the through hole is to discharge the leaked electrolyte. The number of hollow bosses 4 corresponds to the maximum number of high-temperature sodium batteries 6 that can be installed in the box. That is, each high-temperature sodium battery 6 is placed on the corresponding hollow boss 4, as shown in FIG. Figure 4-5 As shown; when in use, each battery is placed on the corresponding hollow boss 4, and the hollow boss 4 is used in conjunction with the through hole to keep the battery away from the bottom plate 3, and the electrolyte can be discharged through the through hole when the battery leaks, avoiding accumulation and contact between the battery and the electrolyte, thereby improving the safety of battery use and solving the problem that the existing sodium battery box cannot drain the leaking electrolyte, which may cause battery short circuit or overheating, and further cause dangerous events such as battery fire or explosion.

[0025] In this embodiment, the hollow boss 4 is an independent structure, which is welded on the bottom plate 3, or the hollow boss 4 and the bottom plate 3 are integrally formed by stamping, that is, the hollow boss 4 is formed by stamping and punching the bottom plate 3; the advantage of the hollow boss 4 with an independent structure is that it can temporarily store the discharged electrolyte without overflowing to the outside of the box body, but the disadvantage is that it will increase the weight of the box body; the hollow boss 4 integrally formed with the bottom plate 3 by stamping has the advantage that it can reduce the weight of the bottom plate 3, and at the same time, it can also serve as a reinforcing rib, which is beneficial to improve the strength and rigidity of the bottom plate 3, and at the same time, in conjunction with the bent outer plate 2, it can improve the overall strength and seismic buffering capacity of the box body 1, avoid structural deformation, extend the service life, and improve the stability of the battery pack operation. The disadvantage is that the electrolyte will overflow through the through hole, which may pollute the environment, but it is also convenient to detect battery abnormalities in time; therefore, the hollow boss 4 of the above two structures each has its advantages and disadvantages, and the specific selection can be made according to actual conditions.

[0026] Depend on Figure 2-3 It can be seen that the hollow boss 4 is a frustum structure, and the size of its upper end surface is larger than the size of the high-temperature sodium battery 6 and its docking surface, so that the stable installation of the battery can be ensured. In this embodiment, the hollow boss 4 is a cylindrical frustum structure, and the outer circumference of the hollow boss 4 is provided with a multi-level convex edge, that is, the outer edge of the longitudinal section of the hollow boss 4 is a multi-level step structure, so that when the electrolyte leaks, it can pass through different levels of steps in sequence, which is conducive to increasing the storage space of the leaked electrolyte in the box.

[0027] In this embodiment, the bottom plate 3 includes multiple models, and the number of hollow bosses 4 arranged on the bottom plates 3 of different models is different, that is, the bottom plate 3 is divided into multiple models according to the number of hollow bosses 4 arranged. The model of the bottom plate 3 in each box can be the same or a combination of multiple models, such as Figure 1 As shown, in the box, the bottom plate 3 includes two models, one model with 28 hollow bosses 4 and the other model with 35 hollow bosses 4; it can be understood that in a box, the model selection of the bottom plate 3 should be affected by the number of cells in the battery pack. In addition, the spacing between two adjacent hollow bosses 4 should be affected by the size of the cells in the battery pack. Therefore, in this embodiment, the number of hollow bosses 4 set on the bottom plate 3 and the spacing between two adjacent hollow bosses 4 are not specifically limited.

[0028] A wire 5 is welded on the outer plate 2, one end of the wire 5 is welded to a specified position on the outer surface of the box, and the other end extends to the outside of the box for external detection of the insulation status of the battery pack, so as to timely know the battery status and thus improve the safety performance of battery use; in this embodiment, the wire 5 is preferably but not limited to a 20AWG high-temperature mica nickel alloy wire.

[0029] When the present embodiment is in use, the box is first assembled according to the size of the battery pack and the number of cells (battery cells). Specifically, a 304 stainless steel of suitable size is selected and bent to form an outer plate 2, and then a bottom plate 3 of suitable size is selected to punch a hollow boss 4 thereon. Alternatively, an existing bottom plate 3 may be selected and used directly, and the bottom plate 3 and the outer plate 2 are welded together to form a box. Meanwhile, a wire 5 is welded to the outer plate 2. Finally, the battery pack is installed in the box to ensure that each cell in the battery pack can be located at the upper end of the corresponding hollow boss 4. This ensures that the battery does not contact the bottom plate 3, which is beneficial to heat dissipation and can also ensure that the battery does not contact the outflowing electrolyte. In addition, under the action of the through hole, when the electrolyte leaks due to the rupture of the ceramic tube, the electrolyte will be discharged through the through hole under the guidance of the hollow boss 4.

[0030] In summary, the addition of the hollow boss 4 and the through hole in the box body of the structure of the present embodiment can not only effectively guide the outflowing electrolyte to avoid accumulation, but also help to dissipate heat and avoid contact between the battery and the electrolyte. At the same time, it can also reduce the weight of the box body and play the role of reinforcing ribs, so that it meets the lightweight requirements while maintaining strength, thereby solving the shortcomings of the box body in the prior art and improving the battery performance.

[0031] The above is only an embodiment of the utility model, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several improvements can be made without departing from the premise of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of the claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A box for a high-temperature sodium battery, comprising a box body with an open upper end, characterized in that: The box body includes an outer plate and a bottom plate, the outer plate is fixed to the bottom plate, a plurality of groups of hollow bosses are provided on the upper surface of the bottom plate, a plurality of through holes are provided on the body of the hollow boss and / or at the connection between the hollow boss and the bottom plate, and the number of the hollow bosses corresponds to the maximum number of the high-temperature sodium batteries that can be installed in the box body.

2. The high temperature sodium battery box according to claim 1, characterized in that: The hollow boss is a frustum structure, and the size of its upper end surface is larger than the size of the high-temperature sodium battery and its docking surface.

3. The high temperature sodium battery box according to claim 2, characterized in that: The hollow boss is a cylindrical frustum structure, and the outer periphery of the hollow boss is provided with a multi-level convex edge, that is, the outer edge of the longitudinal section of the hollow boss is a multi-level stepped structure.

4. The high temperature sodium battery box according to claim 1, characterized in that: The peripheral plate is provided with a wire, one end of which extends into the box body, and the other end of which extends to the outside of the box body for external detection of the insulation state of the battery pack.

5. The high temperature sodium battery box according to claim 1, characterized in that: The hollow boss is an independent structure, which is welded to the bottom plate, or the hollow boss and the bottom plate are integrally formed by punching.

6. The high temperature sodium battery box according to claim 1, characterized in that: The outer plate is formed by bending an integral plate.

7. The high temperature sodium battery box according to claim 1, characterized in that: The base plate includes a plurality of models, and a specified number of the hollow bosses are arranged on the base plate of each model.

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