A battery pressure sensor

Abstract

The present invention relates to a battery air pressure sensor, comprising a hard sleeve, an optical fiber, a strain gauge and a front horn; the front horn comprises a first side surface and a first large bottom surface and a first small bottom surface formed at both ends of the first side surface; the front horn is arranged at the front end of the hard sleeve through the first small bottom surface, and the strain gauge is arranged on the first large bottom surface; the optical fiber is arranged at the rear end of the hard sleeve through a packaging component, and the hard sleeve forms a sealed cavity between the strain gauge and the packaging component; the strain gauge is provided with a reflecting surface on one side close to the sealed cavity; one end of the optical fiber is connected to a photoelectric demodulator, and the other end of the optical fiber is arranged in the sealed cavity and points to the center of the strain gauge. By detecting the degree of depression of the strain gauge, the internal air pressure of the battery pack can be measured, and the strain gauge is arranged on the first large bottom surface of the front horn, so that the area of ​​the strain gauge is larger, thereby improving the sensitivity of the battery air pressure sensor.

Description

Technical Field

[0001] The present invention relates to the fields of battery monitoring and optical fiber technology, and in particular to a battery air pressure sensor. Background Art

[0002] The battery pack is the core energy source of new energy vehicles, providing driving power for the entire vehicle. With the widespread application of new energy vehicles, people's requirements for battery safety are getting higher and higher.

[0003] The battery pack mainly includes a shell and multiple battery cells arranged in the shell, and a number of pressure relief valves are arranged on the surface of the shell. Generally speaking, if a battery cell has a thermal management failure or an internal short circuit failure, the redox reaction in the battery cell will be out of control, thereby generating a large amount of gas. As the gas increases, when the internal air pressure of the shell rises to a threshold, the battery will bulge or the pressure relief valve will be washed away and explode.

[0004] Normally, the shell of a battery pack is a sealed structure. Before the battery pack bulges or explodes, the air pressure inside the shell will gradually rise. In the prior art, there is a lack of an air pressure sensor suitable for battery packs, which makes it impossible to accurately obtain the internal air pressure of the battery pack, and the data collection during the monitoring of the battery pack is not three-dimensional enough. Summary of the invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the present invention proposes a battery air pressure sensor, which is suitable for measuring the internal air pressure of a battery pack and can more comprehensively reflect the real-time status of the battery pack, which is beneficial to ensuring the safety of the battery pack in new energy vehicles.

[0006] The technical solution of the present invention to solve the above technical problem is as follows: a battery air pressure sensor, including a hard sleeve, an optical fiber, a strain gauge and a front horn;

[0007] The hard sleeve is a cylindrical structure, and the front horn portion is a truncated cone tubular structure;

[0008] The front horn portion includes a first side surface and a first large bottom surface and a first small bottom surface formed at two ends of the first side surface, the first large bottom surface and the first small bottom surface are concentric circles, the radius of the first small bottom surface is the same as the radius of the hard sleeve, and the radius of the first large bottom surface is greater than the radius of the first small bottom surface;

[0009] The front horn is arranged at the front end of the hard sleeve through the first small bottom surface, and the strain gauge is arranged on the first large bottom surface;

[0010] The optical fiber is arranged at the rear end of the hard sleeve through a packaging component, and the hard sleeve forms a sealed cavity between the strain gauge and the packaging component;

[0011] The strain gauge is provided with a reflecting surface on one side close to the sealed cavity;

[0012] One end of the optical fiber is connected to a photoelectric demodulator, and the other end of the optical fiber is arranged in the sealed cavity and points to the center of the strain gauge.

[0013] Compared with the prior art, the beneficial effect of the present technical solution is that after the present battery air pressure sensor is placed in the shell of the battery pack, when the internal air pressure of the battery pack rises due to a fault, the strain gauge will be sunken into the sealed cavity. By detecting the degree of the sunken strain gauge, the internal air pressure of the battery pack can be measured, which is conducive to more comprehensive reflection of the real-time status of the battery pack. In addition, compared with directly setting the strain gauge at the front end of the hard sleeve, when the strain gauge is set on the first large bottom surface of the front horn part, the area of ​​the strain gauge is larger, so that when the internal air pressure of the battery pack rises, the degree of the sunken strain gauge is greater, so that the change of the internal air pressure of the battery pack can be sensed more accurately, and the sensitivity of the present battery air pressure sensor is improved.

[0014] Furthermore, the rear end of the hard sleeve is also provided with a rear horn portion;

[0015] The rear end horn portion is a truncated cone-shaped tubular structure, and the rear end horn portion includes a second side surface and a second large bottom surface and a second small bottom surface formed at two ends of the second side surface, the second large bottom surface and the second small bottom surface are concentric circles, the radius of the second small bottom surface is the same as the radius of the hard sleeve, and the radius of the second large bottom surface is greater than the radius of the second small bottom surface;

[0016] The rear end horn portion is arranged at the rear end of the hard sleeve through the second small bottom surface.

[0017] The beneficial effect of adopting the above technical solution is that the rear end horn portion is arranged at the rear end of the hard sleeve, which makes it easier to arrange the optical fiber on the hard sleeve, thereby improving the convenience of manufacturing the battery pressure sensor.

[0018] Furthermore, the hard sleeve, the front end horn portion and the rear end horn portion are an integrally formed structure.

[0019] The beneficial effect of adopting the above technical solution is that the structure of the battery air pressure sensor is made simpler.

[0020] Furthermore, the hard sleeve, the front horn portion and the rear horn portion are externally provided with a supporting component;

[0021] The support component has an empty groove inside, the shape of which matches the external shape of the whole formed by the hard sleeve, the front horn part and the rear horn part. The external shape of the support component is round or square.

[0022] The beneficial effect of adopting the above technical solution is: since the front end and the rear end of the hard sleeve are respectively provided with a front horn part and a rear end horn part, and the size of the front end horn part and the rear end horn part is larger than the size of the hard sleeve, when the battery air pressure sensor is arranged in the battery pack, the front end horn part and the rear end horn part will suspend the hard sleeve, making the structure of the entire battery air pressure sensor unstable. The main structure of the battery air pressure sensor, i.e., the hard sleeve, the front end horn part and the rear end horn part, is arranged in the supporting component, which can avoid the front end horn part and the rear end horn part suspending the hard sleeve, making the structure of the entire battery air pressure sensor more stable.

[0023] Furthermore, the support component is made of sponge or silicone.

[0024] The beneficial effect of adopting the above technical solution is that bumps are inevitable during the driving of the car, and the structure of the battery air pressure sensor is relatively delicate and fragile. Therefore, soft sponge or silicone is used as the material of the supporting component. The soft supporting component can buffer the bumps caused by the driving of the car, effectively protecting the battery air pressure sensor, and at the same time has the advantages of simple production and low cost.

[0025] Furthermore, it also includes a fixing sleeve, the supporting component is arranged in the fixing sleeve, and the fixing sleeve is also provided with a mounting ear.

[0026] The beneficial effect of adopting the above technical solution is: after the front end horn part, the rear end horn part and the hard sleeve are arranged in the supporting component, the supporting component is then arranged in the fixed sleeve, and the bolts are inserted into the mounting ears and tightened on the pre-arranged screw holes in the battery pack, so that the battery air pressure sensor can be fixed inside the battery pack, which has the advantage of simple structure.

[0027] Furthermore, the hard sleeve, the front horn portion and the rear horn portion are made of glass or ceramic.

[0028] The beneficial effect of adopting the above technical solution is: using glass or ceramic as the material of the hard sleeve and the front horn part can ensure the airtightness of the sealed cavity, thereby ensuring the accuracy of the measurement results of the battery air pressure sensor.

[0029] Furthermore, the strain gauge is a stainless steel sheet, and the reflective surface is a silver-plated layer.

[0030] The beneficial effects of adopting the above technical solution are: using stainless steel sheets as strain gauges is easy to process into thin sheets with very small thickness, providing a hardware basis for measuring small changes in air pressure, and is convenient for silver plating. In addition, the silver-plated layer has the advantage of high reflectivity, which can reflect more laser light emitted from the optical fiber back into the optical fiber, and the thickness of the silver-plated layer can be ignored, which is conducive to reducing the thickness of the entire strain gauge.

[0031] Specifically, the thickness of the strain gauge is 20um-50um.

[0032] Furthermore, a first side surface of the front end horn portion is provided with an annular mounting recess along the circumferential direction, the mounting recess is provided on the first large bottom surface, and the strain gauge is provided on the first large bottom surface by being nested in the mounting recess.

[0033] The beneficial effect of adopting the above technical solution is that the strain gauge is sunk into the mounting recess and then sealed with glue, so that the airtightness of the sealed cavity can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A schematic diagram of a battery air pressure sensor of the present invention;

[0035] Figure 2 A schematic diagram of a supporting component in a battery air pressure sensor of the present invention;

[0036] Figure 3 A front view of a front horn portion of a battery air pressure sensor of the present invention;

[0037] Figure 4 The figure is a side view of a front end horn portion of a battery air pressure sensor of the present invention. DETAILED DESCRIPTION

[0038] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0039] like Figure 1 As shown, a battery air pressure sensor includes a hard sleeve 1, an optical fiber 2, a strain gauge 3 and a front horn 4. The hard sleeve 1 is a cylindrical structure, the front horn 4 is a truncated cone tubular structure, and the strain gauge 3 is a thin sheet structure.

[0040] The front horn portion 4 includes a first side surface and a first large bottom surface and a first small bottom surface formed at both ends of the first side surface. The first large bottom surface and the first small bottom surface are concentric circles. The radius of the first small bottom surface is the same as the radius of the hard sleeve 1, and the radius of the first large bottom surface is greater than the radius of the first small bottom surface. In general, the front horn portion 4 can be regarded as a frustum without an upper bottom surface and a lower bottom surface but only a side surface. Correspondingly, the upper bottom surface of the frustum is the first small bottom surface of the front horn portion 4, the lower bottom surface of the frustum is the first large bottom surface of the front horn portion 4, and the side surface of the frustum is the first side surface of the front horn portion 4.

[0041] The structural relationship between the hard sleeve 1, the strain gauge 3 and the front horn 4 is as follows: the front horn 4 is arranged at the front end of the hard sleeve 1 through the first small bottom surface, and the strain gauge 3 is arranged on the first large bottom surface. Since the front horn 4 is to be arranged at the front end of the hard sleeve 1, the radius of the first small bottom surface needs to be the same as the radius of the hard sleeve 1.

[0042] The strain gauge 3 is arranged at the front end of the hard sleeve 1, and correspondingly, the optical fiber 2 is arranged at the rear end of the hard sleeve 1 through the packaging component 5. The hard sleeve 1 forms a sealed cavity between the strain gauge 3 and the packaging component 5, and the strain gauge 3 is provided with a reflective surface on one side close to the sealed cavity. Specifically, the optical fiber 2 can be packaged at the rear end of the hard sleeve 1 by dispensing glue, so the packaging component 5 is a fixed glue structure that solidifies after dispensing glue.

[0043] One end of the optical fiber 2 is connected to the photoelectric demodulator, and the other end of the optical fiber 2 is arranged in the sealed cavity and points to the center of the strain gauge 3. In order to realize the air pressure monitoring function of the battery pack, the photoelectric demodulator needs to be connected to the optical fiber 2. In the present invention, the front end of the hard sleeve 1 is the end close to the strain gauge 3, and the rear end of the hard sleeve 1 is the end close to the optical fiber 2.

[0044] The working principle of the battery air pressure sensor is as follows: the battery air pressure sensor is placed in the battery pack. Under normal circumstances, the sealed cavity is at a standard atmospheric pressure, and the inside of the battery pack is also at a standard atmospheric pressure. At this time, the air pressure in the sealed cavity is equal to the internal air pressure of the battery pack, so the strain gauge 3 will not be sunken. When the battery pack fails and the redox reaction in the battery cell is out of control, thereby generating a large amount of gas, the internal air pressure of the battery pack will increase due to the sealed structure of the battery pack shell, making the internal air pressure of the battery pack greater than the air pressure of the sealed cavity. Therefore, the pressure difference will cause the strain gauge 3 to be sunken into the sealed cavity.

[0045] The photoelectric demodulator is provided with a laser as a light source. The laser emits a laser for detection, and the laser propagates along the optical fiber 2, which is the A light. After the laser is transmitted through the optical fiber 2, a part of the optical signal will be reflected on the end face of the optical fiber 2 before being emitted. The laser reflected by the end face of the optical fiber 2 returns along the original path of the optical fiber 2, which is the B light. In addition, another part of the optical signal that is not reflected on the end face of the optical fiber 2 is output from one end of the optical fiber 2, and is also reflected after being irradiated on the reflective surface of the strain gauge 3, which is the C light.

[0046] The C light reflected by the reflective surface of the strain gauge 3 re-enters the optical fiber 2 from the end face of the optical fiber 2 and returns along the original path of the optical fiber 2. The B light reflected by the end face of the optical fiber 2 and the C light reflected by the reflective surface of the strain gauge 3 have the same transmission direction and frequency, so the B light and the C light will interfere. Interference is the phenomenon that two or more waves overlap in space and superimpose to form a new waveform. The period of the interference waveform generated by interference is related to the optical path difference of the two laser beams. In the present technical solution, the optical path difference between the B light and the C light is related to the distance between the end face of the optical fiber 2 and the strain gauge 3, and the distance between the end face of the optical fiber 2 and the strain gauge 3 is related to the internal air pressure of the battery pack. The photoelectric demodulator can obtain the waveform of the interference wave, analyze the waveform of the interference wave to obtain the period of the interference shape, and then the internal air pressure of the battery pack can be obtained according to the period of the interference shape.

[0047] When the internal air pressure of the battery pack rises, the internal air pressure of the battery pack gradually becomes greater than the air pressure of the sealed cavity, and the internal air pressure of the battery pack compresses the strain gauge 3 to be recessed into the sealed cavity, thereby reducing the distance between the end face of the optical fiber 2 and the strain gauge 3, thereby affecting the period of the interference waveform. Therefore, after analyzing the interference waveform with a photoelectric demodulator, the internal air pressure of the battery pack can be obtained.

[0048] It should be noted that the photoelectric demodulator is a common device in the field of battery monitoring and optical fiber technology, and the detailed information of the interference waveform can be analyzed by the photoelectric demodulator in the above fields. The innovation of the present invention lies in the battery pressure sensor itself, not the photoelectric demodulator.

[0049] Theoretically, the strain gauge 3 can be directly arranged at the front end of the hard sleeve 1, as long as a sealed cavity can be formed between the strain gauge 3 and the packaging component 5, the air pressure monitoring function can also be realized. However, if the strain gauge 3 is directly arranged at the front end of the hard sleeve 1 without the front end horn 4, the change of the internal air pressure of the battery pack of the new energy vehicle cannot be monitored. The reasons include two aspects, one is the particularity of the application environment, and the other is the particularity of the structural characteristics.

[0050] The particularity of the application environment: From the failure of the battery pack to the explosion, the internal pressure rise is the early manifestation of the explosion. When the failure just occurs, the internal pressure is not very high. Only when the internal pressure continues to rise and reaches a certain critical value, it will develop into a later explosion. Therefore, in the process of the internal pressure rising at the front end, the internal pressure of the battery pack is indeed greater than the pressure of the sealed cavity, but this pressure difference is not enough to compress the strain gauge 3 to make it dent into the sealed cavity.

[0051] Peculiarity of structural features: The optical fiber 2 is arranged at the rear end of the hard sleeve 1 through the packaging component 5. In simple terms, the optical fiber 2 is sleeved in the hard sleeve 1, and then the optical fiber 2 and the hard sleeve 1 are packaged by dispensing glue. In this structure, the hard sleeve 1 and the optical fiber 2 are two concentric circles, and the radius of the hard sleeve 1 is only slightly larger than the radius of the optical fiber 2. The core diameter of the general optical fiber 2 is only 125um or 250um, so the diameter of the hard sleeve 1 is actually very small. If the strain gauge 3 is directly set at the front end of the hard sleeve 1, the radius of the strain gauge 3 is the same as the radius of the hard sleeve 1. When the radius of the strain gauge 3 is so small, its deformation is also negligible, and it is also difficult to monitor the tiny air pressure changes inside the battery pack.

[0052] Therefore, in the present invention, the front horn 4 is arranged at the front end of the hard sleeve 1 through the first small bottom surface, and the strain gauge 3 is arranged on the first large bottom surface. Through such an arrangement, the radius of the strain gauge 3 is larger. Compared with the strain gauge 3 with a small radius, the strain gauge 3 with a large radius undergoes a larger deformation when subjected to the same pressure difference. Therefore, such a method can effectively overcome the above limitations, is suitable for the battery pressure inside of new energy vehicles, can more accurately sense the changes in the air pressure inside the battery pack, and improve the sensitivity of the battery air pressure sensor.

[0053] Preferably, a rear end trumpet portion 6 is also provided at the rear end of the hard sleeve 1; the rear end trumpet portion 6 is a truncated cone-shaped tubular structure, and the rear end trumpet portion 6 includes a second side surface and a second large bottom surface and a second small bottom surface formed at both ends of the second side surface, the second large bottom surface and the second small bottom surface are concentric circles, the radius of the second small bottom surface is the same as the radius of the hard sleeve 1, and the radius of the second large bottom surface is greater than the radius of the second small bottom surface; the rear end trumpet portion 6 is arranged at the rear end of the hard sleeve 1 through the second small bottom surface.

[0054] Like the front horn portion 4, the rear horn portion 6 can be regarded as a truncated cone without an upper bottom surface and a lower bottom surface but only with side surfaces. Correspondingly, the upper bottom surface of the truncated cone is the second small bottom surface of the rear horn portion 6, the lower bottom surface of the truncated cone is the second large bottom surface of the rear horn portion 6, and the side surface of the truncated cone is the second side surface of the rear horn portion 6.

[0055] As mentioned above, the radius of the hard sleeve 1 is only slightly larger than the radius of the optical fiber 2. Therefore, in the process of manufacturing the battery pressure sensor, it is difficult to insert the optical fiber 2 into the hard sleeve 1. Correspondingly, a rear horn portion 6 is also provided at the rear end of the hard sleeve 1. When manufacturing the battery pressure sensor, the optical fiber 2 only needs to be inserted into the second largest bottom surface of the rear horn portion 6. The operator only needs to gently push the optical fiber 2 forward, and the optical fiber 2 will be introduced into the hard sleeve 1 along the second side surface of the rear horn portion 6.

[0056] Specifically, the hard sleeve 1, the front horn 4 and the rear horn 6 are an integrally formed structure. In the present technical solution, the hard sleeve 1, the front horn 4 and the rear horn 6 are made of glass or ceramic. Therefore, the hard sleeve 1, the front horn 4 and the rear horn 6 can be formed at one time by a mold during production, which has the advantages of convenient production and simple structure.

[0057] Using glass or ceramic as the material of the hard sleeve 1, the front horn 4 and the rear horn 6 can ensure the airtightness of the sealed cavity, which has the advantage of ensuring measurement accuracy. If the airtightness of the sealed cavity is not good, when subjected to the same pressure difference, the degree of depression of the strain gauge 3 is lower than when the airtightness is good, thus introducing erroneous data.

[0058] like Figure 2 As shown, preferably, a supporting component 7 is further provided on the outside of the hard sleeve 1, the front end horn portion 4 and the rear end horn portion 6; a hollow groove is opened inside the supporting component 7, and the shape of the hollow groove matches the external shape of the whole composed of the hard sleeve 1, the front end horn portion 4 and the rear end horn portion 6, and the external shape of the supporting component 7 is round or square.

[0059] Since the front end and rear end of the hard sleeve 1 are respectively provided with the front horn 4 and the rear end horn 6, and the size of the front horn 4 and the rear end horn 6 is larger than the hard sleeve 1, when the battery pressure sensor is set in the battery pack, the front horn 4 and the rear end horn 6 will suspend the hard sleeve 1, causing problems such as difficulty in installation and instability of the structure of the entire battery pressure sensor. Therefore, correspondingly, the main structure of the battery pressure sensor, i.e., the hard sleeve 1, the front horn 4 and the rear end horn 6, are set in the support component 7, and the empty groove of the support component 7 will be filled into the space outside the hard sleeve 1, the front horn 4 and the rear end horn 6, and then the battery pressure sensor is fixed inside the battery pack through the support component 7. In this way, it is possible to avoid the front horn 4 and the rear end horn 6 suspending the hard sleeve 1, so that the structure of the entire battery pressure sensor is more stable. The external shape of the support component 7 is round or square, which is convenient for installation inside the battery pack.

[0060] The problem of the strain gauge 3 having a small radius can be solved by the front horn 4, and the problem of the difficulty in installing the optical fiber 2 in the hard sleeve 1 can be solved by the rear horn 6, but this also introduces a new problem of the hard sleeve 1 being suspended. If the strain gauge 3 is directly set on the hard sleeve 1, although the hard sleeve 1 will not be suspended, this also makes the battery pressure sensor unsuitable for the application scenario of monitoring the internal air pressure of the battery pack. Therefore, by setting the support component 7, while solving the problem of the strain gauge 3 having a small radius and the difficulty in installing the optical fiber, the hard sleeve 1 will not be suspended, making the battery pressure sensor suitable for the inside of the battery pack.

[0061] Specifically, the material of the support component 7 is sponge or silicone. Both sponge and silicone have the property of being soft. Bumps are inevitable during the driving of a car, and the structure of the battery air pressure sensor is relatively delicate and fragile. Therefore, soft sponge or silicone is used as the material of the support component 7. By utilizing the known properties of sponge or silicone, the soft support component 7 can buffer the bumps caused by the driving of the car, thereby effectively protecting the battery air pressure sensor. At the same time, using sponge or silicone to make the support component 7 also has the advantages of simple production and low cost.

[0062] Preferably, the battery air pressure sensor also includes a fixed sleeve, and the support component 7 is arranged in the fixed sleeve, and the fixed sleeve is also provided with a mounting ear. Since the external shape of the support component 7 is circular or square, correspondingly, the fixed sleeve is also a circular cylindrical structure or a square cylindrical structure. Specifically, the hard sleeve 1, the front horn portion 4 and the rear horn portion 6 form a dumbbell-like structure, and the support component 7 surrounds the hard sleeve 1, the front horn portion 4 and the rear horn portion 6 inside, and then a fixed sleeve is sleeved on the outside of the support component 7. Since the fixing sleeve is also provided with a mounting ear, the battery air pressure sensor can be fixed in the battery pack by inserting the bolt into the mounting ear and tightening it into the pre-set screw hole in the battery pack.

[0063] It should be noted that the above-mentioned fixing sleeve is only used to illustrate one implementation method of fixing the battery pressure sensor inside the battery pack, and does not mean that the battery pressure sensor can only be fixed inside the battery pack in this way.

[0064] In the present technical solution, the strain gauge 3 is a stainless steel sheet, and the reflective surface is a silver-plated layer. Stainless steel has the advantage of high stability and can be used in battery packs for a long time without rusting or failing. At the same time, stainless steel has the advantage of strong ductility, which is convenient for processing into thin sheets as strain gauges 3. In addition, the use of stainless steel sheets as strain gauges 3 can also facilitate silver plating. The silver-plated layer has the advantage of high reflectivity, which can reflect more of the laser emitted from the optical fiber 2 back into the optical fiber 2, and the thickness of the silver-plated layer can be ignored, which is conducive to reducing the thickness of the entire strain gauge 3 and is suitable for the present technical solution. Specifically, the thickness of the strain gauge 3 is 20um-50um.

[0065] like Figure 3 and Figure 4 As shown, preferably, a first side surface of the front horn portion 4 is provided with an annular mounting recess 41 along the circumferential direction, the mounting recess 41 is arranged on the first large bottom surface, and the strain gauge 3 is arranged on the first large bottom surface by being nested in the mounting recess 41 .

[0066] As described above, the front horn portion 4 can be regarded as a truncated cone without an upper bottom surface and a lower bottom surface but only with a side surface. The upper bottom surface of the truncated cone is the first small bottom surface of the front horn portion 4, the lower bottom surface of the truncated cone is the first large bottom surface of the front horn portion 4, and the side surface of the truncated cone is the first side surface of the front horn portion 4. The mounting recess 41 is actually a mounting recess 41 formed by hollowing out the first side surface of the front horn portion 4. The size of the mounting recess 41 matches the size of the strain gauge 3, so that the strain gauge 3 can be just embedded in the mounting recess 41. After the strain gauge 3 is embedded in the mounting recess 41, it is then sealed with glue to ensure the airtightness of the sealed cavity.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery air pressure sensor, characterized in that: It comprises a hard sleeve (1), an optical fiber (2), a strain gauge (3) and a front horn (4); The hard sleeve (1) is a cylindrical structure, and the front horn portion (4) is a truncated cone-shaped tubular structure; The front horn portion (4) comprises a first side surface and a first large bottom surface and a first small bottom surface formed at two ends of the first side surface, the first large bottom surface and the first small bottom surface are concentric circles, the radius of the first small bottom surface is the same as the radius of the hard sleeve (1), and the radius of the first large bottom surface is greater than the radius of the first small bottom surface; The front end horn portion (4) is arranged at the front end of the hard sleeve (1) through the first small bottom surface, and the strain gauge (3) is arranged on the first large bottom surface; A packaging component (5) is provided at the rear end of the hard sleeve (1), and the hard sleeve forms a sealed cavity between the strain gauge (3) and the packaging component (5); The strain gauge (3) is provided with a reflecting surface on a side close to the sealed cavity; One end of the optical fiber (2) is connected to a photoelectric demodulator, and the other end of the optical fiber (2) is arranged in the sealed cavity through the packaging component (5) and points to the center of the strain gauge (3); The rear end of the hard sleeve (1) is also provided with a rear flared portion (6); The rear end horn portion (6) is a truncated cone-shaped tubular structure, and the rear end horn portion (6) comprises a second side surface and a second large bottom surface and a second small bottom surface formed at two ends of the second side surface, the second large bottom surface and the second small bottom surface are concentric circles, the radius of the second small bottom surface is the same as the radius of the hard sleeve (1), and the radius of the second large bottom surface is greater than the radius of the second small bottom surface; The rear end horn portion (6) is arranged at the rear end of the hard sleeve (1) via the second small bottom surface.

2. A battery air pressure sensor according to claim 1, characterized in that: The hard sleeve (1), the front end horn portion (4) and the rear end horn portion (6) are an integrally formed structure.

3. A battery air pressure sensor according to claim 1, characterized in that: A supporting component (7) is further provided outside the hard sleeve (1), the front horn portion (4) and the rear horn portion (6); The support component (7) has an empty slot formed inside, the shape of the empty slot matches the external shape of the whole formed by the hard sleeve (1), the front horn portion (4) and the rear horn portion (6), and the external shape of the support component (7) is circular or square.

4. A battery air pressure sensor according to claim 3, characterized in that: The support component (7) is made of sponge or silica gel.

5. A battery air pressure sensor according to claim 3, characterized in that: It also comprises a hard sleeve (1), the support component (7) being arranged in the hard sleeve (1), and the hard sleeve being provided with a mounting ear.

6. A battery air pressure sensor according to claim 1, characterized in that: The material of the hard sleeve (1), the front horn portion (4) and the rear horn portion (6) is glass or ceramic.

7. A battery air pressure sensor according to claim 1, characterized in that: The strain gauge (3) is a stainless steel sheet, and the reflective surface is a silver-plated layer.

8. A battery air pressure sensor according to claim 1, characterized in that: The thickness of the strain gauge (3) is 20um-50um.

9. A battery air pressure sensor according to claim 1, characterized in that: A first side surface of the front end horn portion (4) is provided with an annular mounting recess (41) along the circumferential direction, the mounting recess (41) being arranged on the first large bottom surface, and the strain gauge (3) being arranged on the first large bottom surface by being nested in the mounting recess (41).

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