Temperature sensor for sodium-chloride nickel battery

Abstract

The application provides a temperature sensor for a sodium-chloride nickel battery, comprising an inner shell, an outer shell and a temperature sensor. The temperature sensor comprises a sensing body and two excess leads, and the two excess leads each have a linearly structured connecting portion and a helically structured supporting portion. The inner shell comprises an upper shell and a lower shell and has at least three bearing spaces. The first bearing space is arranged on the side of the top end face closer to the length direction of the inner shell and is used for bearing the sensing body. The second bearing space and the third bearing space are arranged side by side and are separated by a spacer and are used for bearing the supporting portion. Through a series of innovative designs such as space isolation, helical lead and functional division, the core challenges of the temperature sensor for the high-temperature sodium-chloride nickel battery in the three aspects of electrical insulation, mechanical protection and thermal stress management are actively and systematically solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of temperature collection, in particular to a temperature sensor for a sodium-chloride nickel battery. BACKGROUND

[0002] At present, the working environment of some energy storage batteries is relatively harsh, for example, the working temperature of a sodium-chloride nickel battery is relatively high, generally between 270-350 DEG C (520-660 DEG F). This means that the sodium-chloride nickel battery needs to operate in a high-temperature environment. In addition, the sodium-chloride nickel battery may exist in an extremely harsh environment condition such as salt. Therefore, the temperature sensor must meet higher temperature resistance requirements, and in order to adapt to the harsh environment of the salt of the sodium-chloride nickel battery, it is necessary to meet the two extreme conditions of high temperature and salt resistance. Otherwise, when the temperature sensor fails due to the inability to meet the harsh environment, the battery continues to be in a high-temperature state and cannot be controlled, which may cause many safety hazards.

[0003] Therefore, it is urgent to provide a temperature sensor for a sodium-chloride nickel battery which can adapt to high temperature, salt resistance and other extreme conditions. SUMMARY

[0004] Therefore, the application provides a temperature sensor for a sodium-chloride nickel battery which can adapt to high temperature, salt resistance and other extreme conditions.

[0005] The technical scheme provided by the application is as follows:

[0006] The application provides a temperature sensor for a sodium-chloride nickel battery, which comprises an inner shell, an outer shell and a temperature sensor.

[0007] The temperature sensor comprises a sensing body and two excess leads, and the two excess leads each have a linearly structured connecting portion and a helically structured supporting portion.

[0008] The inner shell comprises an upper shell and a lower shell and has at least three bearing spaces, wherein,

[0009] The first bearing space is arranged closer to the top end surface of the length direction of the inner shell and is used for bearing the sensing body.

[0010] The second bearing space and the third bearing space are arranged side by side and are separated by a spacer, and are used for bearing the supporting portion.

[0011] In one embodiment, the temperature sensor further comprises two outer leads connected to the two excess leads respectively.

[0012] The connecting portion is a linear copper wire, one end of which is connected to one of the excess leads of the temperature sensor, and the other end of which is connected to the first end of the supporting portion.

[0013] The first end of the support part is connected with the outer lead wire, and the second end of the support part is arranged close to the temperature sensor; and the connecting part is arranged on the support part.

[0014] In one embodiment, the diameter of the spiral structure of the support part is determined by the height difference between the two overlead wires of the temperature sensor and the outer lead wire.

[0015] In one embodiment, the inner housing comprises an inner upper housing and an inner lower housing.

[0016] The inner lower housing is provided with the spacer.

[0017] The spacer extends along the length direction of the inner housing, and the minimum distance between the spacer and the top end surface of the length direction of the inner housing is a first interval, which is greater than or equal to the maximum length of the temperature sensor.

[0018] In one embodiment, the inner upper housing and the inner lower housing are symmetrically arranged.

[0019] The spacer is integrally formed with the inner lower housing, and the spacer is higher than the top surface of the inner lower housing.

[0020] In one embodiment, the inner upper housing and the inner lower housing are respectively provided with matching positioning structures on the joint surface, and the positioning structures are matching structures of protrusions and grooves.

[0021] In one embodiment, the inner housing is a hollow central cylindrical ring, an elliptical cylindrical ring or a polygonal ring.

[0022] In one embodiment, the outer housing and the inner housing have the same shape, and the inner ring size of the outer housing is 5%-15% larger than the inner ring size of the inner housing.

[0023] In one embodiment, the inner housing and the outer housing are made of different materials, and the extension length of the outer housing in the length direction is greater than the extension length of the inner housing in the length direction.

[0024] In one embodiment, the inner housing is filled with a colloid, and the colloid covers the temperature sensor, the overlead wires and the outer lead wire.

[0025] The scheme provided in the application has the following beneficial effects:

[0026] 1. The temperature sensor for sodium-chloride nickel battery provided by the application solves the core challenges of high-temperature sodium-chloride nickel battery temperature sensors in electrical insulation, mechanical protection, and thermal stress management through a series of innovative designs such as spatial isolation, spiral lead, and functional zoning. The resulting benefits are significantly improved measurement accuracy, mechanical strength, long-term operation reliability, and service life of the product, which fundamentally reduces the safety hazards of energy storage battery systems caused by sensor failure. Specifically embodied in:

[0027] (1) The second bearing space and the third bearing space are physically isolated by the spacer inside the inner housing. The spacer forms a solid insulating wall, ensuring that the two overlead lines carrying positive and negative signals and the outer lead line are effectively separated throughout the path. This fundamentally eliminates the possibility of short circuit caused by vibration, thermal expansion and contraction, or aging of the filling glue.

[0028] (2) The overlead line adopts a composite structure formed by a unique straight structure connection and a spiral structure support, which can buffer mechanical stress and compensate for thermal stress. When the sodium-chloride nickel battery temperature sensor is in use, transportation, or subjected to external vibration, the spiral support can stretch and bend like a spring, absorbing most of the stress and preventing it from being directly transmitted to the fragile sensing body, thereby preventing it from cracking or performance drift due to stress

[0029] (3) There is a difference in the coefficient of thermal expansion between the inner housing and the metal lead line (including the inner core of the overlead line and the outer lead line). During temperature cycling, the spiral structure can compensate for this size change by deforming itself, releasing thermal stress, thereby preventing the metal lead line (including the inner core of the overlead line and the outer lead line) from being pulled apart or damaged due to excessive stress

[0030] (4) The first bearing space is dedicated to precise temperature sensing, and the second and third bearing spaces are dedicated to metal lead line fixation and stress buffering. This modular design makes the internal structure clear and facilitates automated assembly. In addition, the three functionally distinct bearing spaces ensure that the sensing body, overlead line, and outer lead line can be accurately fixed in the pre-set position. When filling the glue, it can ensure that the glue uniformly wraps each component and does not produce bubbles or dead corners due to component displacement, thereby obtaining a sodium-chloride nickel battery temperature sensor with good consistency and stable performance

[0031] (5) The spiral support provides a large surface area and complex three-dimensional structure. When the filling glue is poured in, it will be firmly embedded and wrapped around the spiral structure. This is equivalent to forming a strong anchoring effect between the overlead line, the outer lead line, and the glue, greatly enhancing the bonding force and preventing the overlead line and the outer lead line from loosening or coming out of the glue during long-term use.

[0032] 2. The temperature sensor for sodium-chloride nickel battery further comprises two outer leads, each of which is connected to one of the two over leads. The connecting part is a straight copper wire, one end of which is connected to one of the over leads of the temperature sensor. The other end of the connecting part is connected to the first end of the supporting part. The first end of the supporting part is connected to the outer lead, and the second end of the supporting part is arranged close to the temperature sensor. The second end of the supporting part is suspended and then filled with the first filling glue. The connecting part is mounted on the supporting part.

[0033] A two-stage stress buffering system is formed. The first stage buffering (the supporting part): the spiral supporting part acts as the main buffer, which first absorbs most of the mechanical stress and thermal stress from the outer lead. The second stage buffering (the connecting part lap joint): the connecting part is combined with the supporting part in a mounting rather than rigid fixed manner, forming a micro-adjustable connecting point. When the buffering of the supporting part reaches the limit or there is high-frequency micro-vibration, this lap joint point can act as an auxiliary, flexible hinge to further dissipate and release the remaining stress. Through the two-stage buffering, the stress finally transmitted to the most sensitive and fragile sensing body is minimized, providing ultimate protection for the sensing body and greatly improving its durability in a vibration and temperature cycle environment.

[0034] 3. The spacer does not extend to the top end of the inner housing, and it creates a continuous, unobstructed first carrying space in the top end area of the inner housing. When the first filling glue is poured into the inner housing (inner lower shell), the glue can flow smoothly and uniformly in the first carrying space, thereby completely covering the sensing body and the connecting wires (over leads and outer leads) on the top of the sensing body, effectively avoiding the formation of bubbles or filling voids in the key temperature sensing area. The glue in the first filling glue forms a complete sealing ring in the first carrying space, providing the sensing body with all-around protection from top to bottom and completely blocking the possibility of corrosive medium intrusion from the top. Further, the first spacer is designed to be greater than or equal to the length of the sensing body, which essentially customizes a dedicated positioning cabin (first carrying space) for the sensing body. The first carrying space ensures that the sensing body can be accurately placed at the axial center position of the ceramic inner housing, which is crucial for ensuring the uniformity and accuracy of temperature measurement. The sensing body is uniformly wrapped in the first carrying space by an appropriate amount of filling glue, which not only serves as a fixing function but also buffers slight impacts from the axial direction, preventing direct collision with the hard top end of the ceramic inner housing.

[0035] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail below, together with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those of ordinary skill in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0037] Figure 1 An exploded view of the temperature sensor for sodium nickel chloride battery provided by the embodiments of the present application;

[0038] Figure 2 An overall structural view of the temperature sensor for sodium nickel chloride battery provided by the embodiments of the present application;

[0039] Figure 3 A partial structural view of the temperature sensor for sodium nickel chloride battery provided by the embodiments of the present application;

[0040] Figure 4 Another partial structural view of the temperature sensor for sodium nickel chloride battery provided by the embodiments of the present application;

[0041] Figure 5 A perspective view of the inner shell of the temperature sensor for sodium nickel chloride battery provided by the embodiments of the present application;

[0042] Figure 6 A structural schematic view of the inner lower shell and the temperature sensor of the temperature sensor for sodium nickel chloride battery provided by the embodiments of the present application.

[0043] Explanation of reference signs:

[0044] Temperature sensor 100 for sodium nickel chloride battery:

[0045] Temperature sensor 10, outer lead 20, inner shell 30, outer shell 40;

[0046] Sensing body 11, excess lead 12: connecting part 12a, supporting part 12b;

[0047] Inner upper shell 31, inner lower shell 32, spacer 33;

[0048] First bearing space 34a, second bearing space 34b and third bearing space 34c;

[0049] First filling glue 51, second filling glue 52. DETAILED DESCRIPTION

[0050] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0052] It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0053] In the description of the present application, it should be noted that the terms "inner", "outer", "upper", "lower", "vertical" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0054] The following will make a detailed description of some embodiments of the present application in combination with the accompanying drawings. The features in the following embodiments can be combined with each other without conflict.

[0055] In view of the defects of the prior art, the technical solutions of the present application are proposed. The technical solutions of the present application will be described in detail below.

[0056] Please refer to Figures 1 to 6 The present application provides a temperature sensor 100 for a sodium-chloride nickel battery, comprising a temperature sensor 10, an outer lead wire 20, an inner housing 30 and an outer housing 40.

[0057] The temperature sensor 10 comprises a sensing body 11 and two excess lead wires 12. The sensing body 11 can be a thermistor. As shown in Figure 6 Both of the two excess lead wires 12 have a linear structure of a connecting part 12a and a spiral structure of a supporting part 12b.

[0058] As shown in Figure 1As shown, the inner housing 30 has at least three carrying spaces, respectively, a first carrying space 34a, a second carrying space 34b and a third carrying space 34c. Among them, the first carrying space 34a is arranged on the side closer to the top end face of the length direction of the inner housing 30, and is used to carry the sensing body 11. The first carrying space 34a also carries a part of the connecting part 12a.

[0059] The second carrying space 34b and the third carrying space 34c are arranged side by side and are separated by a spacer 33, and are used to carry the support part 12b. Specifically, compared with the first carrying space 34a, the second carrying space 34b and the third carrying space 34c are arranged on the side farther away from the top end face of the inner housing 30 in the length direction of the inner housing 30. As shown, Figure 1 and Figure 6 As shown, the second carrying space 34b and the third carrying space 34c are arranged side by side on both sides of the spacer 33. The second carrying space 34b and the third carrying space 34c also carry another part of the connecting part 12a. The second carrying space 34b also carries one of the outer leads 20. The third carrying space 34c also carries the other of the outer leads 20.

[0060] In the above embodiment, on the one hand, the second carrying space 34b and the third carrying space 34c are physically isolated by the spacer 33 inside the inner housing 30. The spacer 33 forms a solid insulating wall, ensuring that the two overlead 12 and outer lead 20 respectively carrying the positive and negative signals are effectively separated throughout the path. This fundamentally eliminates the possibility of short circuit caused by the contact between the leads due to vibration, thermal expansion and contraction, or aging of the filling glue.

[0061] On the other hand, the overlead 12 adopts a unique composite structure formed by the connecting part 12a with a straight line structure and the support part 12b with a spiral structure, which can buffer mechanical stress and compensate for thermal stress. When the temperature sensor 100 for sodium nickel chloride battery is used, transported or subjected to external vibration, the spiral support part 12b can stretch, bend like a spring, absorb most of the stress, prevent the force from being directly transmitted to the fragile sensing body 11 (thermistor), and avoid its cracking or performance drift due to stress.

[0062] There is a difference in the coefficient of thermal expansion between the inner housing (ceramic) 30 and the metal lead (including the inner core of the overlead 12 and the outer lead 20). When the temperature cycles, the spiral structure can compensate for this size change by deforming itself, releasing thermal stress, thereby preventing the metal lead (including the inner core of the overlead 12 and the outer lead 20) from being pulled apart or the sensing body from being damaged due to excessive stress.

[0063] In another aspect, the inner housing 30 has three functionally distinct carrying spaces. The first carrying space 34a is dedicated to precise temperature sensing, and the second carrying space 34b and the third carrying space 34c are dedicated to metal lead fixation and stress buffering. This modular design makes the internal structure clear and facilitates automated assembly. In addition, the three functionally distinct carrying spaces ensure that the sensing body 11, the overlead 12, and the outer lead 20 can be accurately fixed at the predetermined positions. When filling the glue, it can be ensured that the glue uniformly wraps each component and does not produce bubbles or fill dead angles due to component displacement, thereby obtaining a temperature sensor 100 for sodium nickel chloride batteries with good consistency and stable performance.

[0064] The spiral support part 12b provides a large surface area and a complex three-dimensional structure. When the glue (such as ceramic glue) is filled in, it will be firmly embedded and wrapped around the spiral structure. This is equivalent to forming a strong anchoring effect between the overlead 12, the outer lead 20, and the glue, greatly enhancing the bonding force and preventing the overlead 12 and the outer lead 20 from loosening or coming out of the glue during long-term use.

[0065] In this embodiment, the embodiment is not simply stacking elements together, but through a series of innovative designs such as spatial isolation, spiral leads, and functional zoning, actively and systematically solves the core challenges of temperature sensors for high-temperature sodium nickel chloride batteries in electrical insulation, mechanical protection, and thermal stress management. The ultimate beneficial effect is to significantly improve the measurement accuracy, mechanical strength, long-term operation reliability, and service life of the product, and fundamentally reduce the safety hazards of energy storage battery systems caused by sensor failure.

[0066] In one embodiment, the connecting part 12a and the support part 12b are both made of copper wire. The support part 12b can increase the height of the positive and negative electrodes of the sensing body 11, so that the positive and negative electrodes of the sensing body 11 are supported by the overlead 12 and matched with the outer lead 20.

[0067] In one embodiment, the temperature sensor 100 for sodium nickel chloride batteries further includes two outer leads 20 connected to the two overleads 12. The connecting part 12a is a straight copper wire, one end of which is connected to one of the overleads 12 of the temperature sensor 10. The other end is connected to the first end of the support part 12b. The first end of the support part 12b is connected to the outer lead 20, and the second end of the support part 12b is suspended near the temperature sensor 10. The second end of the support part 12b is filled with filling glue. The connecting part 12a is mounted on the support part 12b.

[0068] In this embodiment, a two-stage stress buffering system is formed. The first stage buffering (support part 12b): the helical structure of the support part 12b acts as the main buffer, which first absorbs most of the mechanical and thermal stress from the external lead 20. The second stage buffering (connection part 12a overlap): the connection part 12a is combined with the support part 12b in an overlapped but not rigidly fixed manner, forming a micro-movable connection point. When the buffering of the support part 12b reaches the limit or there is high-frequency micro-vibration, this overlap point can act as an auxiliary, flexible hinge to further absorb and release the remaining stress. Through these two stages of buffering, the stress ultimately transmitted to the most sensitive and fragile sensing body 11 is minimized, providing ultimate protection for the sensing body 11 (thermistor) and greatly improving its durability in a vibration and temperature cycling environment.

[0069] In one embodiment, the diameter of the helical structure of the support part 12b is determined by the height difference between the two overlead wires 12 of the temperature sensor 10 and the external lead 20. The buffering capacity of the helical structure of the support part 12b is directly related to its geometric size. The structure of the support part 12b is not specifically limited to a (helical) support part 12b with a preset diameter. It can also be a (helical) support part 12b with a variable diameter. The cross-section of the (helical) support part 12b can be circular, elliptical, or other uniform or gradually changing shapes.

[0070] In this embodiment, the internal space of the temperature sensor 100 for sodium nickel chloride batteries (especially the cross-sectional area of the ceramic inner housing 30) is strictly limited. By accurately calculating and determining the helical diameter according to the actual height difference, it can be ensured that the helical structure of the support part 12b perfectly fills the space from the sensing body 11 to the external lead 20 in the vertical direction. It avoids the risk of insufficient vertical support due to the helical diameter of the helical structure of the support part 12b being too small, or interference with the shell wall of the inner housing 30 due to the helical diameter being too large. The technical solution in this embodiment makes the internal structure of the temperature sensor 100 for sodium nickel chloride batteries very compact and neat, creating optimal conditions for uniform flow and coating of the filling glue.

[0071] As shown in Figure 3 and Figure 4 In one embodiment, the inner housing 30 includes an inner upper shell 31 and an inner lower shell 32. The inner lower shell 32 has a spacer 33 in the center. The spacer 33 does not extend in the direction of the entire length of the inner lower shell 32. The spacer 33 extends along the length direction of the inner housing 30, and the minimum distance between the spacer 33 and the top end face of the length direction of the inner housing 30 is a first interval, which is greater than or equal to the maximum length of the sensing body 11. The size of the first interval can be adjusted and changed according to the actual size of the sensing body 11. Specifically, the first interval can be 5%-10% larger than the maximum length of the sensing body 11.

[0072] In this embodiment, since the spacer 33 does not extend to the top of the inner housing 30, it creates a continuous, unobstructed first load-bearing space 34a in the top region of the inner housing 30. Figure 5 As shown, when the first filler adhesive 51 (ceramic adhesive) is poured into the inner shell 30 (lower inner shell 32), the adhesive can flow smoothly and uniformly within the first bearing space 34a, thereby completely covering the sensing body 11 and its top connecting lines (transition leads 12 and outer leads 20), effectively preventing the formation of air bubbles or filling voids in the critical temperature sensing area. The adhesive of the first filler adhesive 51 forms a complete sealing ring in the first bearing space 34a, providing all-around protection for the sensing body 11 from top to bottom, completely blocking the possibility of corrosive media intruding from the top. Furthermore, designing the first interval to be greater than or equal to the length of the sensing body 11 essentially creates a custom-designed positioning chamber (first bearing space 34a) for the sensing body 11. The first bearing space 34a ensures that the sensing body 11 can be accurately placed at the axial position of the ceramic inner shell 30, which is crucial for ensuring the uniformity and accuracy of temperature measurement. The sensing body 11 is uniformly wrapped in an appropriate amount of filler glue in the first bearing space 34a. The glue not only serves to fix the body, but also buffers the slight impact from the axial direction, preventing it from directly colliding with the top of the hard ceramic inner shell 30.

[0073] In one embodiment, the inner upper shell 31 and the inner lower shell 32 are symmetrically arranged. A spacer 33 is integrally formed with the inner lower shell 32, and the spacer 33 is higher than the top surface of the inner lower shell 32. In some embodiments, the spacer 33 is disposed in the center of the inner lower shell 32, and the height of the spacer 33 can be set to be equal to the inner diameter of the inner shell 30, ensuring that when the inner upper shell 31 and the inner lower shell 32 are fastened together, the spacer 33 contacts the center of the inner wall of the inner upper shell 31.

[0074] In this embodiment, the symmetrical arrangement of the inner upper shell 31 and inner lower shell 32 brings significant advantages in production and assembly, as well as improved structural reliability. First, the symmetrical arrangement of the inner upper shell 31 and inner lower shell 32 means they are identical or mirror images of each other, which greatly simplifies mold design and manufacturing, reduces the variety of parts and management costs, and avoids the hassle of distinguishing directions during assembly, facilitating automated assembly. Second, the spacer 33 is integrally formed with the inner lower shell 32, ensuring structural integrity and maximum mechanical strength, avoiding potential detachment, displacement, or the introduction of additional weak points that might occur due to bonding or assembling another independent spacer. Finally, the spacer 33 is higher than the top surface of the inner lower shell 32, allowing it to contact or tightly fit with the inner upper shell 31 before the upper and lower shells are closed, ensuring that the two lead channels are correctly positioned and isolated before being filled, further guaranteeing the reliability of electrical insulation.

[0075] In one embodiment, the inner upper shell 31 and the inner lower shell 32 are respectively provided with mutually cooperating positioning structures on the joint surface, which are the cooperating structures of protrusions and grooves.

[0076] In this embodiment, the core benefit of the design of the positioning structure lies in ensuring the accuracy and consistency of assembly. The cooperation of protrusions and grooves (similar to the structure of mortise and tenon) plays an accurate guiding and positioning role in the process of shell combination, which can effectively prevent any misplacement of the inner upper shell 31 and the inner lower shell 32 in the horizontal direction. This is crucial for ensuring that the internal spacer 33 can be accurately centered, thereby perfectly separating the two external leads 20. In addition, accurate positioning also ensures the uniformity of the gap of the joint surface, so that the first filling glue can form an effective seal to prevent the formation of a leakage channel, while providing a reliable physical reference for automated production, significantly improving product yield and performance consistency.

[0077] In one embodiment, the inner shell 30 is a hollow central cylindrical ring, an elliptical cylindrical ring or a polygonal ring. The polygonal ring may, for example, be a three-sided ring, a five-sided ring, a six-sided ring, an eight-sided ring, etc. The specific structural design can be determined according to actual needs.

[0078] In this embodiment, flexible structural design adaptability and potential functional optimization are provided. Providing multiple shape options allows the designer of the temperature sensor 100 for sodium-chloride nickel batteries to select the most suitable shape according to the installation space limitations inside the battery, for example, a cylindrical ring is suitable for a standard circular hole, and a polygonal ring can prevent rotation in the mounting seat. In addition, an elliptical cylindrical ring or some polygonal rings can have directionality in design, which can ensure that the sensor is installed in a specific orientation, thereby optimizing its temperature-sensing surface towards the heat source. At the same time, these hollow ring structures achieve material saving and weight reduction under the premise of ensuring structural strength.

[0079] In one embodiment, the outer shell 40 has the same shape as the inner shell 30, and the inner ring size of the outer shell 40 is 5%-15% larger than the inner ring size of the inner shell 30.

[0080] In this embodiment, through the design of the inner ring size of the outer shell 40 and the inner ring size of the inner shell 30, the temperature sensor 100 can be precisely controlled to be installed in a specific orientation, for example, the temperature-sensing surface of the sensor is oriented towards the heat source. Figure 3The second filling glue layer 52 is shown to have a thickness to achieve its best function. By carefully calculating the inner ring size difference between the inner shell 30 and the outer shell 40, a uniform annular cavity is formed between the inner shell 30 and the outer shell 40. The size range of 5%-15% ensures that the cavity can accommodate enough volume of the second filling glue 52 to provide excellent stress buffering and absorption effect to resolve the thermal expansion difference between the ceramic and the metal; and can also avoid the excessive thickness of the glue layer which leads to excessive decline in thermal conductivity, affecting the temperature response speed, or the excessive thinness of the glue layer which leads to insufficient mechanical strength and protection. This is a perfect balance between stress buffering and heat conduction.

[0081] In one embodiment, the inner shell 30 and the outer shell 40 are made of different materials, and the outer shell 40 has a length in the length direction greater than the length of the inner shell 30 in the length direction. In one embodiment, the inner shell 30 is made of ceramic material, and the outer shell 40 is made of stainless steel material.

[0082] In this embodiment, the inner shell 30 is made of ceramic to ensure insulation and corrosion resistance, and the outer shell 40 is made of stainless steel to provide mechanical strength. Secondly, the outer shell 40 is longer to form a suspended protective sleeve, which has multiple benefits: first, it provides additional protection and reinforcement for the lead outlet area at the rear end of the temperature sensor 100 for sodium nickel chloride batteries; second, it creates a longer packaging path, which facilitates the pouring and sealing of the second filling glue 52 and improves the anti-leakage capability; third, the longer outer shell 40 (the outer shell can be provided as a metal shell) also provides more structural support for the installation and fixation (such as through threads or a press ring) of the temperature sensor 100 for sodium nickel chloride batteries itself, making the installation more secure.

[0083] In one embodiment, the inner shell 30 is filled with glue, which covers the temperature sensor 10, the excess lead 12, and the outer lead 20. In one embodiment, the inner shell 30 and the outer shell 40 are also connected by glue, and the glue here and the glue filled in the inner shell 30 can be the same or different.

[0084] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0085] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A temperature sensor for a sodium nickel chloride battery, comprising: Inner housing, outer housing, temperature sensor; characterized in that, The temperature sensor includes a sensing body, two transition leads, and two external leads; the two external leads are respectively connected to the two transition leads; each of the two transition leads has a straight connecting portion and a spiral supporting portion; the connecting portion is mounted on the supporting portion. The connecting part is a straight copper wire, one end of which is connected to the temperature sensor and the other end of which is connected to the first end of the support part; the first end of the support part is connected to the external lead, and the second end of the support part is located close to the temperature sensor; the diameter of the spiral structure of the support part is determined by the height difference between the two transition leads of the temperature sensor and the external lead. The inner shell includes an upper shell and a lower shell, and has at least three load-bearing spaces, wherein, The first bearing space is located on the top surface side closer to the inner shell in the length direction, and is used to bear the sensing body; The second and third bearing spaces are arranged side by side and separated by a spacer, and are used to support the support part; The spacer forms a robust insulating wall, ensuring that the two transition leads and the outer lead, which respectively carry positive and negative signals, are effectively separated throughout the path.

2. The temperature sensor for a sodium-nickel chloride battery according to claim 1, characterized in that, The inner shell includes: an upper inner shell and an inner lower shell; The spacer is provided in the inner lower shell; The spacer extends along the length of the inner housing, and the minimum distance between the spacer and the top surface of the inner housing along the length is the first gap, which is greater than or equal to the maximum length of the temperature sensor.

3. The temperature sensor for a sodium-nickel chloride battery according to claim 2, characterized in that, The inner upper shell and the inner lower shell are symmetrically arranged; The spacer is integrally formed with the inner lower shell, and the spacer is higher than the top surface of the inner lower shell.

4. The temperature sensor for a sodium-nickel chloride battery according to claim 2, characterized in that, The inner upper shell and the inner lower shell are respectively provided with mutually cooperating positioning structures on their mating surfaces. The positioning structures are a combination of protrusions and grooves.

5. The temperature sensor for a sodium-nickel chloride battery according to claim 1, characterized in that, The inner shell is a cylindrical ring, elliptical cylindrical ring, or polygonal ring with a central hollowed-out structure.

6. The temperature sensor for a sodium-nickel chloride battery according to claim 5, characterized in that, The outer shell has the same shape as the inner shell, and the inner ring size of the outer shell is 5%-15% larger than the inner ring size of the inner shell.

7. The temperature sensor for a sodium-nickel chloride battery according to claim 1, characterized in that, The inner shell and the outer shell are made of different materials, and the outer shell has a longer extension in the longitudinal direction than the inner shell.

8. The temperature sensor for a sodium-nickel chloride battery according to claim 7, characterized in that, The inner shell is made of ceramic material, and the outer shell is made of stainless steel material.

9. The temperature sensor for a sodium-nickel chloride battery according to claim 1, characterized in that, The inner housing is filled with a colloid, which covers the temperature sensor, the transition lead, and the outer lead.

10. The temperature sensor for a sodium nickel chloride battery according to claim 9, characterized in that, A first filler adhesive is injected into the inner shell, and the adhesive of the first filler adhesive forms a complete sealing ring in the first bearing space.

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