A durable pressure sensor

Abstract

The utility model relates to pressure detection technical field discloses a durable pressure sensor, including detachable connection's encapsulation and response subassembly, the central position of encapsulation forms has the oiling cavity, the oiling cavity is provided with the first end and the second end of opposite position, the first end is provided with the pressure diaphragm, the response subassembly includes circuit board and sets up the inductor device on circuit board, circuit board with second end abuts, the inductor device is located in the oiling cavity, the pressure diaphragm includes pressure diaphragm layer, first protective film layer and second protective film layer, first protective film layer with second protective film layer respectively sets up in the opposite sides of pressure diaphragm layer. The utility model plays the following technical effect: through setting up first protective film layer and second protective film layer in the opposite sides of pressure diaphragm layer respectively, strengthens pressure diaphragm mechanical strength, prolongs pressure diaphragm service life, improves detection accuracy.

Description

Technical Field

[0001] This utility model belongs to the field of pressure detection technology, specifically relating to a durable pressure sensor. Background Technology

[0002] In active safety management systems for batteries, pressure sensors are typically included to monitor the internal pressure of the battery. These sensors are mounted on the battery casing, with their sensing components extending into the casing to detect the internal pressure in real time. For lithium batteries containing highly corrosive electrolytes, direct contact between the pressure sensor's sensing component and the electrolyte would cause corrosion and affect its normal operation. Therefore, an oil-filled cavity filled with silicone oil is usually installed around the sensing component, with a pressure-receiving diaphragm at its end. This pressure-receiving diaphragm replaces the sensing component in contact with the electrolyte. When pressure is applied to the diaphragm, it transmits the pressure through the silicone oil to the sensing component, thus enabling pressure sensing.

[0003] However, existing pressure sensors typically use a single-layer stainless steel or aluminum alloy membrane structure for the pressure-receiving membrane. Since the pressure-receiving membrane needs to be subjected to pressure repeatedly, and the mechanical strength of a single-layer membrane structure is not high, the pressure-receiving membrane is prone to damage after repeated stress, resulting in a short service life and affecting the accuracy of pressure detection results. Utility Model Content

[0004] To address the shortcomings of the prior art, this invention provides a durable pressure sensor. By setting a first protective membrane layer and a second protective membrane layer on opposite sides of the pressure-bearing membrane layer, the pressure-bearing membrane component has a three-layer membrane structure. The presence of the first and second protective membrane layers not only protects the pressure-bearing membrane layer but also enhances the mechanical strength of the pressure-bearing membrane component, effectively extending its service life. At the same time, it also improves the accuracy of pressure detection results.

[0005] The technical effects to be achieved by this utility model are realized through the following technical aspects: This utility model provides a durable pressure sensor, including a package and a sensing component, wherein the package and the sensing component are detachably connected. An oil filling cavity is formed at the center of the package. The oil filling cavity is provided with a first end and a second end that are positioned opposite each other. A pressure-receiving diaphragm is provided at the first end. The sensing component includes a circuit board and a sensing device disposed on the circuit board. The circuit board abuts against the second end, and the sensing device is located in the oil filling cavity. The pressure-bearing membrane includes a pressure-bearing membrane layer, a first protective membrane layer, and a second protective membrane layer, wherein the first protective membrane layer and the second protective membrane layer are respectively disposed on opposite sides of the pressure-bearing membrane layer.

[0006] As a further description of the technical solution of this utility model, the pressure-bearing membrane layer is a stainless steel membrane layer, and the first protective membrane layer and the second protective membrane layer are both aluminum alloy membrane layers.

[0007] As a further description of the technical solution of this utility model, the edge of the package is provided with a buckle, and the edge of the circuit board extends outward to form a snap-fit ​​protrusion, which engages with the buckle.

[0008] As a further description of the present utility model, the edge of the circuit board extends outward to form a positioning protrusion, the positioning protrusion is connected to one side of the snap-fit ​​protrusion, the distance from the outermost side of the positioning protrusion to the center of the circuit board is greater than the distance from the outermost side of the snap-fit ​​protrusion to the center of the circuit board, and the positioning protrusion abuts against the buckle.

[0009] As a further description of the technical solution of this utility model, the durable pressure sensor also includes a fastener, a first through hole is provided on the edge of the circuit board, a second through hole is provided on the edge of the package corresponding to the position of the first through hole, and the fastener passes through the first through hole and the second through hole.

[0010] As a further description of the technical solution of this utility model, the packaging component has a first connecting surface and a second connecting surface opposite to each other on its edge, the buckle is disposed on the first connecting surface, the first connecting surface abuts against the circuit board, and the second connecting surface is used to connect with an external mounting carrier.

[0011] As a further description of the technical solution of this utility model, the first connecting surface is recessed in the direction of the second connecting surface to form an annular groove, the annular groove is located on the outer periphery of the oil injection cavity, and a sealing ring is provided in the annular groove, the sealing ring being interference-fitted with the circuit board.

[0012] As a further description of the technical solution of this utility model, the sensing component also includes a connecting device, which is disposed on the side of the circuit board away from the oil injection cavity, and the connecting device is used to transmit pressure detection parameters to the outside.

[0013] As a further description of the technical solution of this utility model, the sensing device is a MEMS sensing device.

[0014] As a further description of the technical solution of this utility model, the package is an aluminum alloy package.

[0015] In summary, this utility model has at least the following advantages: The durable pressure sensor provided by this utility model has a three-layer sandwich structure consisting of a first protective membrane layer and a second protective membrane layer on opposite sides of the pressure-bearing membrane layer. The first and second protective membrane layers provide all-round protection for the pressure-bearing membrane layer and enhance the mechanical strength of the pressure-bearing membrane component. This prevents damage after repeated stress, effectively extending the service life of the pressure-bearing membrane component and thus extending the service life of the durable pressure sensor. At the same time, it also improves the accuracy of pressure detection results. Attached Figure Description

[0016] Figure 1 This is an exploded view of the durable pressure sensor according to Embodiment 1 of this utility model; Figure 2 This is an exploded view of the durable pressure sensor of Embodiment 2 of this utility model; Figure 3 This is a schematic diagram of the structure of the durable pressure sensor of Embodiment 2 of this utility model; Figure 4 This is a top view of the circuit board of Embodiment 2 of this utility model; Figure 5 This is an exploded view of the durable pressure sensor of Embodiment 3 of this utility model.

[0017] Marked in the image: 1. Encapsulation component; 11. Oil filling cavity; 111. First end; 112. Second end; 12. Buckle; 13. Second through hole; 14. First connecting surface; 15. Second connecting surface; 16. Annular groove; 2. Sensing component; 21. Circuit board; 211. Snap-fit ​​protrusion; 212. Positioning protrusion; 213. First through hole; 22. Sensing device; 23. Connecting device; 3. Pressure-bearing membrane component; 31. Pressure-bearing membrane layer; 32. First protective membrane layer; 33. Second protective membrane layer; 4. Fasteners; 5. Sealing rings. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are some, but not all, of the embodiments of this utility model.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] Example 1 refer to Figure 1 The durable pressure sensor provided in this embodiment includes a package 1 and a sensing component 2, which are detachably connected. An oil filling cavity 11 is formed at the center of the package 1. The oil filling cavity 11 has a first end 111 and a second end 112 positioned opposite each other. A pressure-bearing diaphragm 3 is provided at the first end 111. The sensing component 2 includes a circuit board 21 and a sensing device 22 disposed on the circuit board 21. The circuit board 21 abuts against the second end 112, and the sensing device 22 is located within the oil filling cavity 11.

[0021] It is understood that both the first end 111 and the second end 112 of the oil filling chamber 11 have openings. The pressure-receiving diaphragm 3 is connected to the edge of the opening of the first end 111 and closes the opening of the first end 111. The circuit board 21 abuts against the edge of the opening of the second end 112 and closes the opening of the second end 112. Thus, the oil filling chamber 11 forms a closed chamber. The oil filling chamber 11 is filled with silicone oil. When the pressure-receiving diaphragm 3 receives pressure, it will transmit the pressure to the sensing device 22 through the silicone oil, thereby realizing the sensing and detection of pressure.

[0022] The pressure-receiving diaphragm 3 includes a pressure-receiving diaphragm layer 31, a first protective diaphragm layer 32, and a second protective diaphragm layer 33, which are respectively disposed on opposite sides of the pressure-receiving diaphragm layer 31. The first and second protective diaphragm layers 32 and 33 serve a protective function; therefore, their thicknesses can be set to be less than the thickness of the pressure-receiving diaphragm layer 31, and the thickness of the first protective diaphragm layer 32 is the same as the thickness of the second protective diaphragm layer 33. This ensures both protection and maintains the pressure-receiving diaphragm layer 31's sensitivity to pressure, guaranteeing the sensing sensitivity of the durable pressure sensor.

[0023] By setting a first protective membrane layer 32 and a second protective membrane layer 33 on opposite sides of the pressure-bearing membrane layer 31, the pressure-bearing membrane component 3 has a three-layer sandwich membrane structure consisting of the first protective membrane layer 32, the pressure-bearing membrane layer 31, and the second protective membrane layer 33. The presence of the first protective membrane layer 32 and the second protective membrane layer 33 can provide all-round protection for the pressure-bearing membrane layer 31 and enhance the mechanical strength of the pressure-bearing membrane component 3. This makes the pressure-bearing membrane component 3 less prone to damage after repeated stress, effectively extending its service life and improving the accuracy of pressure detection results.

[0024] In one implementation, the pressure-bearing membrane layer 31 is a stainless steel membrane layer, while the first protective membrane layer 32 and the second protective membrane layer 33 are both aluminum alloy membrane layers. The aluminum alloy membrane layer can be formed on the stainless steel membrane layer through processes such as metal plating. Because the aluminum alloy membrane layer is relatively thin and has strong corrosion resistance, using aluminum alloy membrane layers as the first protective membrane layer 32 and the second protective membrane layer 33 can both protect the pressure-bearing membrane layer 31 and not affect the sensitivity of the pressure-bearing membrane layer 31 to receiving pressure.

[0025] In this embodiment, the sensing device 22 is a MEMS sensing device. MEMS (Micro-Electro-Mechanical Systems) sensing devices have advantages such as high sensitivity and strong stability, and can realize real-time and accurate pressure detection inside the battery.

[0026] In this embodiment, the package 1 is an aluminum alloy package, which has strong corrosion resistance and can effectively extend the service life of the durable pressure sensor.

[0027] Example 2 As a further optimization of Example 1, in Figure 1 Based on, refer to Figures 2 to 4 The edge of the package 1 is provided with a buckle 12, and the edge of the circuit board 21 extends outward in a direction parallel to the circuit board 21 to form a snap-fit ​​protrusion 211, which engages with the buckle 12. It should be noted that in this embodiment, the buckle 12 and the snap-fit ​​protrusion 211 are connected in an upper and lower snap-fit ​​relationship. The end of the buckle 12 can be formed with a guide slope to guide the snap-fit ​​protrusion 211 to move downward and snap into the inside of the buckle 12. The buckle 12 has a certain elasticity. When it is necessary to separate the sensing component 2 from the package 1, the end of the buckle 12 can be moved to make the buckle 12 leave the snap-fit ​​protrusion 211 to release the connection between the sensing component 2 and the package 1. The installation and disassembly process is simple, convenient and easy to operate, which can reduce the maintenance difficulty of the sensing component 2 and also help extend the service life of the durable pressure sensor.

[0028] The number of snap-fit ​​protrusions 211 can be one or more, and the number of snap-fit ​​buckles 12 corresponds to the number of snap-fit ​​protrusions 211. Preferably, the number of snap-fit ​​protrusions 211 is three, and the three snap-fit ​​protrusions 211 are arranged in a triangular distribution. The position of the snap-fit ​​buckle 12 corresponds to the position of the snap-fit ​​protrusion 211. This can improve the stability of the connection between the sensing component 2 and the package 1.

[0029] As a further optimization, a positioning protrusion 212 is formed on the edge of the circuit board 21 extending outward in a direction parallel to the circuit board 21. The positioning protrusion 212 is connected to one side of the snap-fit ​​protrusion 211. The distance L1 from the outermost side of the positioning protrusion 212 to the center O of the circuit board 21 is greater than the distance L2 from the outermost side of the snap-fit ​​protrusion 211 to the center O of the circuit board 21. The side of the positioning protrusion 212 abuts against the side of the buckle 12. The positioning protrusion 212 mainly serves as a pre-positioning device. Before the snap-fit ​​protrusion 211 and the buckle 12 are engaged, the side of the positioning protrusion 212 near the snap-fit ​​protrusion 211 can be made to abut against the side of the buckle 12. At this time, the position of the snap-fit ​​protrusion 211 corresponds exactly to the position of the buckle 12. Then, by pressing down on the snap-fit ​​protrusion 211, the snap-fit ​​protrusion 211 can be snapped into the inside of the buckle 12. By setting the positioning protrusion 212, the snap-fit ​​protrusion 211 and the snap fastener 12 can be quickly aligned, which can improve the installation efficiency of the sensing component 2 and the accuracy of the connection between the sensing component 2 and the package 1.

[0030] As a further optimization, the durable pressure sensor also includes a fastener 4. A first through-hole 213 is formed on the edge of the circuit board 21, and a second through-hole 13 is formed on the edge of the package 1 corresponding to the position of the first through-hole 213. The fastener 4 passes through the first through-hole 213 and the second through-hole 13. The fastener 4 can further secure the connection between the circuit board 21 and the package 1, preventing the circuit board 21 from loosening and further improving the tightness of the connection between the circuit board 21 and the package 1.

[0031] Fastener 4 can be a locking screw. The inner wall of the second through hole 13 can be threaded. The locking screw can pass through the first through hole 213 and the second through hole 13 in sequence and be screwed into the second through hole 13. It should be noted that the first through hole 213 can be opened at any position on the edge of the circuit board 21, and there can be one or more first through holes 213. The position and number of the second through holes 13 correspond to the first through hole 213. In this embodiment, there is one first through hole 213, which is opened on one of the positioning protrusions 212. The position and number of the second through holes 13 correspond to the first through hole 213.

[0032] Example 3 As a further optimization of Example 2, in Figures 1 to 4 Based on, refer to Figure 5 The packaging component 1 has a first connecting surface 14 and a second connecting surface 15 opposite to each other on its edges. A buckle 12 is disposed on the first connecting surface 14, which abuts against the circuit board 21. The second connecting surface 15 is used for welding to an external mounting carrier. The external mounting carrier can be a battery casing or a pipe, or other carrier that requires internal pressure detection. In this embodiment, the external mounting carrier is a battery casing. It should be noted that the pressure-bearing diaphragm 3 is located on one side of the second connecting surface 15. The oil injection cavity 11 can pass through the battery casing, placing the pressure-bearing diaphragm 3 inside the battery casing. After the second connecting surface 15 is welded to the battery casing, the pressure-bearing diaphragm 3 is located inside the battery casing, while the sensing component 2 is located outside the battery casing.

[0033] As a further optimization, an annular groove 16 is formed by recessing the first connecting surface 14 towards the second connecting surface 15. The annular groove 16 is located on the outer periphery of the oil injection cavity 11, and a sealing ring 5 is provided inside the annular groove 16. The sealing ring 5 is interference-fitted with the circuit board 21. The sealing ring 5 can be a rubber ring. Since the rubber ring has strong elasticity, the interference fit between the rubber ring and the circuit board 21 can prevent silicone oil leakage in the oil injection cavity 11, and can further improve the sensing sensitivity and detection accuracy of the durable pressure sensor.

[0034] In some embodiments, the sensing component 2 further includes a connection device 23, which is disposed on the side of the circuit board 21 away from the oil filling cavity 11. The connection device 23 is used to transmit pressure detection parameters to the outside to facilitate active safety management of the battery.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] Although the description of this utility model has been given in conjunction with the specific embodiments described above, it is obvious to those skilled in the art that many substitutions, modifications, and variations can be made based on the above description. Therefore, all such substitutions, modifications, and variations are included within the spirit and scope of the appended claims.

Claims

1. A durable pressure sensor, characterized in that, It includes a package (1) and a sensing component (2), wherein the package (1) and the sensing component (2) are detachably connected; The packaging component (1) has an oil filling cavity (11) formed at its center. The oil filling cavity (11) has a first end (111) and a second end (112) positioned opposite each other. The first end (111) is provided with a pressure-bearing diaphragm (3). The sensing component (2) includes a circuit board (21) and a sensing device (22) disposed on the circuit board (21). The circuit board (21) abuts against the second end (112). The sensing device (22) is located inside the oil filling cavity (11). The pressure-bearing membrane (3) includes a pressure-bearing membrane layer (31), a first protective membrane layer (32), and a second protective membrane layer (33), wherein the first protective membrane layer (32) and the second protective membrane layer (33) are respectively disposed on opposite sides of the pressure-bearing membrane layer (31).

2. The durable pressure sensor according to claim 1, characterized in that, The pressure-bearing membrane layer (31) is a stainless steel membrane layer, and the first protective membrane layer (32) and the second protective membrane layer (33) are both aluminum alloy membrane layers.

3. The durable pressure sensor according to claim 1, characterized in that, The edge of the package (1) is provided with a buckle (12), and the edge of the circuit board (21) extends outward to form a snap-fit ​​protrusion (211), which engages with the buckle (12).

4. The durable pressure sensor according to claim 3, characterized in that, The edge of the circuit board (21) extends outward to form a positioning protrusion (212), which is connected to one side of the snap-fit ​​protrusion (211). The distance from the outermost side of the positioning protrusion (212) to the center of the circuit board (21) is greater than the distance from the outermost side of the snap-fit ​​protrusion (211) to the center of the circuit board (21). The positioning protrusion (212) abuts against the buckle (12).

5. The durable pressure sensor according to claim 3, characterized in that, It also includes a fastener (4), the edge of the circuit board (21) is provided with a first through hole (213), the edge of the package (1) is provided with a second through hole (13) corresponding to the position of the first through hole (213), and the fastener (4) passes through the first through hole (213) and the second through hole (13).

6. The durable pressure sensor according to claim 3, characterized in that, The package (1) has a first connecting surface (14) and a second connecting surface (15) opposite to each other on its edge. The buckle (12) is disposed on the first connecting surface (14). The first connecting surface (14) abuts against the circuit board (21). The second connecting surface (15) is used to connect with an external mounting carrier.

7. The durable pressure sensor according to claim 6, characterized in that, The first connecting surface (14) is recessed in the direction of the second connecting surface (15) to form an annular groove (16). The annular groove (16) is located on the outer periphery of the oil injection cavity (11). A sealing ring (5) is provided in the annular groove (16). The sealing ring (5) is interference-fitted with the circuit board (21).

8. The durable pressure sensor according to claim 1, characterized in that, The sensing component (2) also includes a connecting device (23), which is disposed on the side of the circuit board (21) away from the oil injection cavity (11) and is used to transmit pressure detection parameters to the outside.

9. The durable pressure sensor according to claim 1, characterized in that, The sensing device (22) is a MEMS sensing device.

10. The durable pressure sensor according to claim 1, characterized in that, The encapsulation component (1) is an aluminum alloy encapsulation component.

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