A pressure sensor

Abstract

The utility model relates to pressure detection technical field discloses a kind of pressure sensor, including sensing component and packaging piece, the sensing component and the packaging piece are detachably connected;The sensing component includes circuit board and the inductor device being set on the circuit board, the center position of the packaging piece is formed with injection cavity, one end of the injection cavity is provided with force diaphragm, the injection cavity is away from the force diaphragm one end and the circuit board abuts, the inductor device is located in the injection cavity;The rim of the circuit board is formed with first convex part, the rim of the packaging piece is provided with buckle structure, the first convex part and the buckle structure snap-fit connection.The utility model plays following technical effect: through the first convex part on circuit board and the buckle structure snap-fit connection on packaging piece, the detachable connection of sensing component and packaging piece can be implemented, effectively reduce the maintenance difficulty of sensing component, with advantage to prolong the service life of pressure sensor.

Description

Technical Field

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

[0002] Due to the presence of highly corrosive electrolyte inside lithium batteries, traditional pressure sensors cannot be directly immersed in the electrolyte to monitor the internal pressure of the battery. Therefore, an oil filling chamber is set outside the pressure sensor, and a pressure-bearing diaphragm is set on the outside of the oil filling chamber. The oil filling chamber is filled with silicone oil. When the pressure-bearing diaphragm is subjected to pressure, the pressure is transmitted to the pressure sensor through the silicone oil. This not only realizes the pressure sensing of the pressure sensor, but also completely isolates the pressure sensor from the electrolyte / corrosive gas inside the lithium battery. This helps to extend the service life of the pressure sensor and improve the measurement accuracy.

[0003] However, although existing pressure sensors have solved the problem of electrolyte corrosion, the oil filling chamber is usually welded or integrally formed with the pressure sensor. When the pressure sensor malfunctions and needs to be repaired, the oil filling chamber cannot be removed, which brings many inconveniences to the pressure sensor repair work and increases the maintenance difficulty of the pressure sensor. Utility Model Content

[0004] To address the shortcomings of the prior art, this utility model provides a pressure sensor that connects the sensing component and the package by engaging a first protrusion on the circuit board with a snap-fit ​​structure on the package. This allows for a detachable connection between the sensing component and the package, effectively reducing the difficulty of daily maintenance and repair of the sensing component and extending the service life of the pressure sensor.

[0005] The technical effects to be achieved by this utility model are realized through the following technical aspects: This utility model provides a pressure sensor, including a sensing component and a package, wherein the sensing component and the package are detachably connected. The sensing component includes a circuit board and a sensing device disposed on the circuit board. A liquid injection cavity is formed at the center of the package. A force-receiving diaphragm is disposed at one end of the liquid injection cavity. The end of the liquid injection cavity away from the force-receiving diaphragm abuts against the circuit board. The sensing device is located in the liquid injection cavity. The circuit board has a first protrusion on its edge, and the package has a snap-fit ​​structure on its edge, with the first protrusion engaging with the snap-fit ​​structure.

[0006] As a further description of the technical solution of this utility model, the pressure sensor also includes a fixing screw, the edge of the circuit board is provided with a first connecting hole, the edge of the package is provided with a second connecting hole corresponding to the position of the first connecting hole, and the fixing screw passes through the first connecting hole and the second connecting hole.

[0007] As a further description of the technical solution of this utility model, a second protrusion is also formed on the edge of the circuit board, the second protrusion is connected to one side of the first protrusion, and the second protrusion abuts against the buckle structure.

[0008] As a further description of the technical solution of this utility model, the distance from the outermost side of the second protrusion to the center of the circuit board is greater than the distance from the outermost side of the first protrusion to the center of the circuit board.

[0009] 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 structure is disposed on the first connecting surface, the first connecting surface abuts against the circuit board, and the second connecting surface is used for welding to an external mounting carrier.

[0010] 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 injection cavity, and a sealing ring is provided in the annular groove, the sealing ring being interference-fitted with the circuit board.

[0011] 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 injection cavity, and the connecting device is used to transmit pressure sensing parameters to the outside.

[0012] As a further description of the technical solution of this utility model, the sensing device is a MEMS sensing device.

[0013] As a further description of the technical solution of this utility model, the package is an aluminum alloy package.

[0014] As a further description of the technical solution of this utility model, the force-bearing diaphragm is a stainless steel diaphragm.

[0015] In summary, this utility model has at least the following advantages: The pressure sensor provided by this utility model has a first protrusion on the edge of the circuit board and a snap-fit ​​structure on the edge of the package that mates with the first protrusion. The engagement between the first protrusion and the snap-fit ​​structure enables a detachable connection between the sensing component and the package. When the sensing component needs repair or maintenance, simply disengage the first protrusion from the snap-fit ​​structure. This convenient operation effectively reduces the difficulty of daily maintenance and repair of the sensing component, and helps extend the service life of the pressure sensor. Attached Figure Description

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

[0017] Marked in the image: 1. Sensing component; 11. Circuit board; 111. First protrusion; 112. First connecting hole; 113. Second protrusion; 12. Sensing device; 13. Connecting device; 2. Encapsulation component; 21. Liquid injection cavity; 22. Snap-fit ​​structure; 23. Second connecting hole; 24. First connecting surface; 25. Second connecting surface; 26. Annular groove; 3. Force-bearing diaphragm; 4. Fixing screws; 5. Sealing ring. 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 1The pressure sensor provided in this embodiment includes a sensing component 1 and a package 2, which are detachably connected. The sensing component 1 includes a circuit board 11 and a sensing device 12 disposed at the center of the circuit board 11. A liquid injection cavity 21 is formed at the center of the package 2. A force-receiving diaphragm 3 is disposed at one end of the liquid injection cavity 21, and the end of the liquid injection cavity 21 away from the force-receiving diaphragm 3 abuts against the circuit board 11. The sensing device 12 is located inside the liquid injection cavity 21, which is used to contain silicone oil.

[0021] The package 2 can be connected to an external mounting carrier. In this embodiment, the external mounting carrier is the battery cell housing. When the package 2 is fixed to the battery cell housing, the liquid injection chamber 21 passes through the battery cell housing, and the force-receiving diaphragm 3 is located inside the battery cell housing, while the sensing component 1 is located outside the battery cell housing. When the pressure inside the battery cell housing changes, the force-receiving diaphragm 3 transmits the pressure through the silicone oil in the liquid injection chamber 21 to the sensing device 12, thereby realizing pressure detection inside the battery cell. Thus, pressure detection inside the battery cell can be achieved while ensuring complete isolation between the sensing component 1 and the electrolyte / corrosive gas inside the battery cell. Since the sensing device 12 is not corroded by the electrolyte / corrosive gas, the accuracy of its pressure detection results will be higher, and the service life of the sensing device 12 will also be longer.

[0022] Furthermore, the edge of the circuit board 11 extends outward in a direction parallel to the circuit board 11 to form a first protrusion 111, and the edge of the package 2 is provided with a snap-fit ​​structure 22, the first protrusion 111 and the snap-fit ​​structure 22 are engaged and connected. It should be noted that the end of the snap-fit ​​structure 22 is formed with a guide slope, which can be used to guide the first protrusion 111 into the inside of the snap-fit ​​structure 22. The snap-fit ​​structure 22 has a certain elasticity. When it is necessary to separate the sensing component 1 from the package 2, it is only necessary to move the snap-fit ​​structure 22 to make the snap-fit ​​structure 22 separate from the first protrusion 111 to release the connection between the sensing component 1 and the package 2. The sensing component 1 and the package 2 can be detachably connected by engaging the first protrusion 111 on the circuit board 11 with the snap-fit ​​structure 22 on the package 2. When the sensing component 1 needs to be repaired or maintained, it is only necessary to release the engagement between the first protrusion 111 and the snap-fit ​​structure 22. The operation is convenient, effectively reducing the difficulty of daily maintenance and repair of the sensing component 1, reducing maintenance costs, and also helping to extend the service life of the pressure sensor.

[0023] It should be noted that the number of first protrusions 111 can be one or more, and correspondingly, the number of snap-fit ​​structures 22 can also be one or more, with the number of snap-fit ​​structures 22 matching the number of first protrusions 111. In this embodiment, the number of first protrusions 111 and snap-fit ​​structures 22 is three, and the three first protrusions 111 and the three snap-fit ​​structures 22 are all triangularly distributed, thereby improving the connection stability between the sensing component 1 and the package 2.

[0024] In some embodiments, the pressure sensor may also include a fixing screw 4, a first connection hole 112 is provided on the edge of the circuit board 11, and a second connection hole 23 is provided on the edge of the package 2 corresponding to the position of the first connection hole 112. The fixing screw 4 passes through the first connection hole 112 and the second connection hole 23. The connection between the sensing component 1 and the package 2 can be further strengthened by locking the fixing screw 4, and the detachable connection between the sensing component 1 and the package 2 can also be satisfied.

[0025] The number of fixing screws 4, the first connecting hole 112, and the second connecting hole 23 can each be one or more, and the number of fixing screws 4, the first connecting hole 112, and the second connecting hole 23 are matched. In this embodiment, the number of fixing screws 4, the first connecting hole 112, and the second connecting hole 23 is one. The first connecting hole 112 can be opened at any position on the edge of the circuit board 11 as needed, and the position of the second connecting hole 23 corresponds to the position of the first connecting hole 112.

[0026] In this embodiment, the sensing device 12 is a MEMS (Micro-Electro-Mechanical Systems) sensing device. MEMS sensing devices have the advantages of small size and light weight, making them more suitable for pressure detection inside the battery cell. At the same time, MEMS sensing devices also have the advantages of high sensitivity and strong stability, enabling real-time and accurate pressure detection inside the battery cell.

[0027] In this embodiment, the encapsulation component 2 is an aluminum alloy encapsulation component, and the stress-bearing diaphragm 3 is a stainless steel diaphragm. Both aluminum alloy and stainless steel materials have high corrosion resistance, which can improve the durability of the encapsulation component 2 and the stress-bearing diaphragm 3.

[0028] It should be noted that the pressure sensor in this embodiment is suitable for pressure detection inside the battery cell, but is not limited thereto. The pressure sensor in this embodiment can also be used for pressure detection inside pipes or other application scenarios that require internal pressure detection.

[0029] Example 2 As a further optimization of Example 1, in Figure 1 Based on, refer to Figures 2 to 3The edge of the circuit board 11 extends outward in a direction parallel to the circuit board 11 to form a second protrusion 113. The second protrusion 113 is connected to one side of the first protrusion 111, and the side of the second protrusion 113 abuts against the side of the snap-fit ​​structure 22. The second protrusion 113 serves as a positioning element. Before the first protrusion 111 is engaged with the snap-fit ​​structure 22, the side of the second protrusion 113 abuts against the side of the snap-fit ​​structure 22, allowing the first protrusion 111 and the snap-fit ​​structure 22 to be quickly aligned, thereby achieving a quick engagement connection between the first protrusion 111 and the snap-fit ​​structure 22. At the same time, it also ensures the accuracy of the connection between the first protrusion 111 and the snap-fit ​​structure 22.

[0030] It should be noted that the distance L1 from the outermost side of the second protrusion 113 to the center O of the circuit board 11 is greater than the distance L2 from the outermost side of the first protrusion 111 to the center O of the circuit board 11. That is, the second protrusion 113 is on the outermost side relative to the first protrusion 111, which ensures that the side of the second protrusion 113 can smoothly abut against the side of the snap-fit ​​structure 22.

[0031] Example 3 As a further optimization of Example 2, in Figures 1 to 3 Based on, refer to Figure 4 The package 2 has a first connecting surface 24 and a second connecting surface 25 opposite to each other on its edges. A snap-fit ​​structure 22 is disposed on the first connecting surface 24, which abuts against the circuit board 11. The second connecting surface 25 is used for welding to the battery cell housing. The main body of the liquid injection chamber 21 is connected to the second connecting surface 25. After the second connecting surface 25 is welded to the battery cell housing, the liquid injection chamber 21 can pass through the through hole on the battery cell housing so that the force-bearing diaphragm 3 is located inside the battery cell housing.

[0032] As a further optimization, an annular groove 26 is formed by recessing the first connecting surface 24 towards the second connecting surface 25. The annular groove 26 is located on the outer periphery of the injection cavity 21, and a sealing ring 5 is disposed within the annular groove 26. The sealing ring 5 is interference-fitted with the circuit board 11. The sealing ring 5 can be a rubber ring. Due to the high elasticity of the sealing ring 5, the interference fit between the sealing ring 5 and the circuit board 11 can prevent the leakage of silicone oil in the injection cavity 21, thereby further improving the sensing sensitivity and detection accuracy of the pressure sensor.

[0033] In some embodiments, the sensing component 1 further includes a connection device 13, which is disposed on the side of the circuit board 11 away from the liquid injection cavity 21. The connection device 13 is used to transmit pressure sensing parameters to the outside of the battery cell for safe management of the battery cell.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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 pressure sensor, characterized in that, It includes a sensing component (1) and a package (2), wherein the sensing component (1) and the package (2) are detachably connected; The sensing component (1) includes a circuit board (11) and a sensing device (12) disposed on the circuit board (11). A liquid injection cavity (21) is formed at the center of the package (2). A force-receiving diaphragm (3) is disposed at one end of the liquid injection cavity (21). The end of the liquid injection cavity (21) away from the force-receiving diaphragm (3) abuts against the circuit board (11). The sensing device (12) is located inside the liquid injection cavity (21). The circuit board (11) has a first protrusion (111) formed on its edge, and the package (2) has a snap-fit ​​structure (22) on its edge. The first protrusion (111) is engaged with the snap-fit ​​structure (22).

2. The pressure sensor according to claim 1, characterized in that, It also includes a fixing screw (4), the edge of the circuit board (11) is provided with a first connection hole (112), the edge of the package (2) is provided with a second connection hole (23) corresponding to the position of the first connection hole (112), and the fixing screw (4) passes through the first connection hole (112) and the second connection hole (23).

3. The pressure sensor according to claim 1, characterized in that, The edge of the circuit board (11) is also formed with a second protrusion (113), which is connected to one side of the first protrusion (111) and abuts against the snap-fit ​​structure (22).

4. The pressure sensor according to claim 3, characterized in that, The distance from the outermost side of the second protrusion (113) to the center of the circuit board (11) is greater than the distance from the outermost side of the first protrusion (111) to the center of the circuit board (11).

5. The pressure sensor according to claim 1, characterized in that, The package (2) has a first connecting surface (24) and a second connecting surface (25) opposite to each other on its edge. The snap-fit ​​structure (22) is disposed on the first connecting surface (24). The first connecting surface (24) abuts against the circuit board (11). The second connecting surface (25) is used for welding to an external mounting carrier.

6. The pressure sensor according to claim 5, characterized in that, The first connecting surface (24) is recessed in the direction of the second connecting surface (25) to form an annular groove (26). The annular groove (26) is located on the outer periphery of the injection cavity (21). A sealing ring (5) is provided in the annular groove (26). The sealing ring (5) is interference-fitted with the circuit board (11).

7. The pressure sensor according to claim 1, characterized in that, The sensing component (1) further includes a connecting device (13), which is disposed on the side of the circuit board (11) away from the injection cavity (21) and is used to transmit pressure sensing parameters to the outside.

8. The pressure sensor according to claim 1, characterized in that, The sensing device (12) is a MEMS sensing device.

9. The pressure sensor according to claim 1, characterized in that, The encapsulation component (2) is an aluminum alloy encapsulation component.

10. The pressure sensor according to claim 1, characterized in that, The force-bearing diaphragm (3) is a stainless steel diaphragm.

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