A battery pressure sensor

Abstract

The utility model relates to pressure detection technical field discloses a kind of battery pressure sensor, including detachably connected sensing component and packaging piece, the opposite ends of packaging piece are formed with first end and second end respectively, and the center area of packaging piece is hollow and formed with oil injection cavity, and oil injection cavity is communicated first end and second end, sensing component is connected in first end and covers oil injection cavity, second end is provided with stress diaphragm, and stress diaphragm covers oil injection cavity;The rim of first end extends and is formed with mounting portion towards outer periphery, and the opposite sides of mounting portion are formed with first connecting surface and second connecting surface respectively, and first connecting surface is located in the side of mounting portion away from second end, and first connecting surface is recessed and formed with welding groove towards the direction close to second connecting surface.The utility model plays the following technical effects: by setting welding groove in mounting portion, ensure that molten metal always stays in welding groove when welding, avoid welding defects, ensure welding quality.

Description

Technical Field

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

[0002] Currently, pressure sensors used in batteries (especially lithium batteries) typically include a sensing element and a housing fixedly connected to the sensing element. A pressure-bearing diaphragm is located at the bottom of the housing, and a liquid-filling cavity is formed inside the housing, filled with a transmission medium such as silicone oil. Both the sensing element and the pressure-bearing diaphragm are in direct contact with the transmission medium in the liquid-filling cavity. The housing is usually made of metal, and its outer edge has a mounting portion for connection to the battery casing. The mounting portion of the housing is connected to the battery casing by welding, thus enabling the installation of the pressure sensor.

[0003] However, during the welding process, impurities such as moisture or oil may be present in the welding area. These impurities will expand and vaporize under high temperature conditions, causing molten metal in the welding area to splash and form defects such as pits or craters in or around the welding area. This seriously affects the welding quality and may even affect the sealing of the connection between the package holder and the battery casing, thereby affecting the accuracy of the pressure sensor detection results and reducing the safety of the battery. Utility Model Content

[0004] To address the shortcomings of the prior art, this utility model provides a battery pressure sensor with a welding groove on the mounting part of the package, so that the welding area is located within the welding groove. The inner wall of the welding groove can block the splashed molten metal, ensuring that the molten metal always stays in the welding groove, thereby avoiding welding defects, effectively improving welding quality, and ensuring the sealing of the connection between the package and the battery housing.

[0005] The technical effects to be achieved by this utility model are realized through the following technical aspects: This utility model provides a battery pressure sensor, including a detachably connected sensing component and a package. The package has a first end and a second end formed at opposite ends. An oil filling cavity is formed in the central area of ​​the package. The oil filling cavity connects the first end and the second end. The sensing component is connected to the first end and covers the oil filling cavity. A force-receiving diaphragm is provided at the second end, and the force-receiving diaphragm covers the oil filling cavity. The first end has an edge extending outward to form a mounting portion. A first connecting surface and a second connecting surface are formed on opposite sides of the mounting portion. The first connecting surface is located on the side of the mounting portion away from the second end. The first connecting surface is recessed in the direction close to the second connecting surface to form a welding groove.

[0006] As a further description of the technical solution of this utility model, the sensing component includes a circuit board, a sensing device, and a signal transmission device. The sensing device and the signal transmission device are respectively disposed on opposite sides of the circuit board. The circuit board is connected to the first end, and the sensing device is located in the oil injection cavity.

[0007] As a further description of the technical solution of this utility model, an oil injection hole is provided in the central area of ​​the circuit board. The oil injection hole is located on one side of the sensing device, and the position of the oil injection hole corresponds to the position of the oil injection cavity. A sealing member for sealing the oil injection hole is provided in the oil injection hole.

[0008] As a further description of the technical solution of this utility model, the battery pressure sensor also includes a connector, the edge of the circuit board is provided with a first connection hole, the edge of the first end is provided with a second connection hole, and the connector passes through the first connection hole and the second connection hole.

[0009] As a further description of the technical solution of this utility model, the connector is a screw, the first connecting hole is a through hole, the second connecting hole is a blind hole, and the inner sidewall of the second connecting hole has a threaded structure. The connector passes through the first connecting hole and is screwed to the second connecting hole.

[0010] As a further description of the technical solution of this utility model, the first end is recessed in a direction close to the second end to form an annular groove, the annular groove is located between the oil injection cavity and the second connecting hole, and a sealing element is provided in the annular groove, the sealing element being interference-fitted with the circuit board.

[0011] As a further description of the technical solution of this utility model, the edge of the first end protrudes in a direction away from the second end to form a positioning post, and the edge of the circuit board is provided with a positioning groove corresponding to the position of the positioning post, and the positioning post is inserted into the positioning groove.

[0012] As a further description of the technical solution of this utility model, the second end is also provided with a reinforcing pad, the second end and the reinforcing pad are respectively connected to the opposite sides of the force-bearing diaphragm, and the central area of ​​the reinforcing pad is provided with a clearance through hole, the position of the clearance through hole corresponding to the position of the oil injection cavity.

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

[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 battery pressure sensor provided by this utility model has a welding groove on the mounting part of the package, so that the welding area is located in the welding groove. During the welding process, when the molten metal in the welding area splashes, it will fall into the bottom of the welding groove under the blocking effect of the inner side wall of the welding groove, so that the splashed molten metal is retained in the welding groove. This avoids the formation of welding defects such as pits or craters in or around the welding area, effectively improves the welding quality, ensures good sealing at the connection between the package and the battery shell, guarantees the accuracy and authenticity of the pressure detection results of the pressure sensor, and also helps to improve the safety of battery use. Attached Figure Description

[0016] Figure 1 This is an exploded schematic diagram (a) of the battery pressure sensor according to Embodiment 1 of this utility model. Figure 2 This is a second exploded schematic diagram of the battery pressure sensor according to Embodiment 1 of this utility model. Figure 3 This is a cross-sectional view of the battery pressure sensor according to Embodiment 1 of this utility model; Figure 4 This is an exploded view of the battery pressure sensor according to Embodiment 2 of this utility model; Figure 5 This is an exploded schematic diagram of the battery pressure sensor of Embodiment 3 of this utility model.

[0017] Marked in the image: 1. Sensing component; 11. Circuit board; 111. Oil filling hole; 112. Sealing component; 113. First connecting hole; 114. Positioning groove; 12. Sensing device; 13. Signal transmission device; 2. Encapsulation component; 21. First end; 211. Second connecting hole; 212. Positioning post; 22. Second end; 23. Oil filling cavity; 24. Mounting part; 241. First connecting surface; 242. Second connecting surface; 243. Welding groove; 25. Annular groove; 3. Force-bearing diaphragm; 4. Connecting components; 5. Sealing components; 6. Reinforcing gasket; 61. Clearance through hole. 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 Figures 1 to 3 The battery pressure sensor provided in this embodiment includes a detachably connected sensing component 1 and a package 2. The package 2 has a first end 21 and a second end 22 formed at opposite ends. An oil filling cavity 23 is formed in the hollow central area of ​​the package 2, connecting the first end 21 and the second end 22. The sensing component 1 is connected to the first end 21 and covers the oil filling cavity 23. A force-receiving diaphragm 3 is provided at the second end 22, covering the oil filling cavity 23. The covering effect of the sensing component 1 and the force-receiving diaphragm 3 makes the oil filling cavity 23 a closed cavity. The oil filling cavity 23 is filled with silicone oil. Both the sensing component 1 and the force-receiving diaphragm 3 are in direct contact with the silicone oil in the oil filling cavity 23. The silicone oil can transmit the pressure received by the force-receiving diaphragm 3 to the sensing component 1, thereby realizing pressure sensing and detection.

[0021] A mounting portion 24 is formed by extending the edge of the first end 21 outwards. A first connecting surface 241 and a second connecting surface 242 are formed on opposite sides of the mounting portion 24. The first connecting surface 241 is located on the side of the mounting portion 24 away from the second end 22, and a welding groove 243 is formed by recessing the first connecting surface 241 towards the direction close to the second connecting surface 242. During battery pressure sensor installation, the second connecting surface 242 is first brought into contact with the battery casing, and then the welding equipment is aligned with the welding groove 243 to perform the welding operation. During the welding process, when molten metal splashes in the welding area, it falls into the bottom of the welding groove 243 due to the obstruction of the inner wall of the welding groove 243, ensuring that the molten metal remains within the welding groove 243. This effectively avoids welding defects such as pits or craters in the welding area or its surrounding area, improves welding quality, ensures good sealing at the connection between the package 2 and the battery casing, guarantees the accuracy and authenticity of the pressure sensor's pressure detection results, and also helps improve the safety of battery use.

[0022] In some embodiments, the sensing component 1 includes a circuit board 11, a sensing device 12, and a signal transmission device 13. The sensing device 12 and the signal transmission device 13 are respectively disposed on opposite sides of the circuit board 11. The circuit board 11 is connected to the first end 21, and the sensing device 12 is located inside the oil filling cavity 23. In this embodiment, the sensing device 12 is a MEMS (Micro-Electro-Mechanical Systems) sensor, and the signal transmission device 13 is a connector. The signal transmission device 13 can be used to transmit pressure sensing parameters to an external battery management system for active safety management of the battery.

[0023] In some embodiments, an oil injection hole 111 is provided in the central region of the circuit board 11. The oil injection hole 111 is located on one side of the sensing device 12, and its position corresponds to the position of the oil injection cavity 23. A sealing member 112 for sealing the oil injection hole 111 is provided in the oil injection hole 111. During the production process of the battery pressure sensor, silicone oil can be injected into the oil injection cavity 23 through the oil injection hole 111. After the silicone oil is filled, the sealing member 112 is then sealed in the oil injection hole 111. In this embodiment, the sealing member 112 is formed at the oil injection hole 111 by soldering.

[0024] Example 2 As a further optimization of Example 1, in Figures 1 to 3 Based on, refer to Figure 4 The battery pressure sensor also includes a connector 4. A first connection hole 113 is provided along the edge of the circuit board 11, and a second connection hole 211 is provided along the edge of the first end 21. The connector 4 passes through the first connection hole 113 and the second connection hole 211. The number of connectors 4, the first connection hole 113, and the second connection hole 211 are the same, preferably three or four, thereby ensuring the stability and reliability of the connection between the sensing component 1 and the package 2.

[0025] In one embodiment, the connector 4 is a screw, the first connecting hole 113 is a through hole, and the second connecting hole 211 is a blind hole. The inner wall of the second connecting hole 211 has a threaded structure (not shown in the figure). The connector 4 passes through the first connecting hole 113 and is screwed into the second connecting hole 211. Through the cooperation of the internal thread structure of the second connecting hole 211 and the screw, a detachable connection between the sensing component 1 and the package 2 can be achieved. The connection structure is simple, and the installation and disassembly process is convenient and efficient.

[0026] In some embodiments, the first end 21 is recessed towards the second end 22 to form an annular groove 25. The annular groove 25 is located between the oil injection cavity 23 and the second connecting hole 211. A sealing element 5 is disposed within the annular groove 25, and the sealing element 5 is interference-fitted with the circuit board 11. The sealing element 5 is made of a highly elastic material, such as a rubber ring. Through the interference fit between the sealing element 5 and the circuit board 11, leakage of silicone oil in the oil injection cavity 23 can be prevented, thereby improving the sealing performance of the oil injection cavity 23 and thus improving the accuracy of the pressure sensing results.

[0027] As a further optimization, the edge of the first end 21 protrudes in a direction away from the second end 22 to form a positioning post 212. A positioning groove 114 is formed on the edge of the circuit board 11 corresponding to the position of the positioning post 212, and the positioning post 212 is inserted into the positioning groove 114. The number of positioning posts 212 can be one or more, and the number of positioning grooves 114 matches the number of positioning posts 212. In this embodiment, there are two positioning posts 212 and two positioning grooves 114, with the two positioning posts 212 distributed in a mirror-symmetrical manner, and the positions of the positioning grooves 114 corresponding to the positions of the positioning posts 212. The positioning posts 212 can position the circuit board 11 before connection. Through the cooperation of the positioning grooves 114 and the positioning posts 212, the circuit board 11 can be accurately aligned and abutted against the first end 21, facilitating further connection between the circuit board 11 and the first end 21. This improves the accuracy and efficiency of the connection process between the circuit board 11 and the first end 21.

[0028] Example 3 As a further optimization of Example 2, in Figures 1 to 4 Based on, refer to Figure 5 The second end 22 is also provided with a reinforcing gasket 6. The second end 22 and the reinforcing gasket 6 are respectively connected to opposite sides of the edge of the force-bearing diaphragm 3. The second end 22, the force-bearing diaphragm 3 and the reinforcing gasket 6 can be connected by welding. A clearance through hole 61 is opened in the central area of ​​the reinforcing gasket 6. The position of the clearance through hole 61 corresponds to the position of the oil injection cavity 23, thereby ensuring the normal force and force transmission of the force-bearing diaphragm 3.

[0029] By setting the reinforcing pad 6, the edge of the force-bearing diaphragm 3 can be sandwiched between the second end 22 and the reinforcing pad 6, thereby enhancing the connection strength at the connection between the force-bearing diaphragm 3 and the second end 22, preventing tearing or damage between the force-bearing area and the edge connection during the force-bearing process, effectively improving the durability of the force-bearing diaphragm 3, and extending the service life of the battery pressure sensor.

[0030] In this embodiment, the package 2 is an aluminum alloy package, and the reinforcing gasket 6 is an aluminum alloy gasket. Aluminum alloy has high mechanical strength and corrosion resistance. Using aluminum alloy for the package 2 and the reinforcing gasket 6 can ensure that the battery pressure sensor has high mechanical strength and corrosion resistance, which is beneficial to extending the service life of the battery pressure sensor.

[0031] In this embodiment, the force-bearing diaphragm 3 is a stainless steel diaphragm. Stainless steel not only has high mechanical strength and corrosion resistance, but also a certain degree of flexibility. Using a stainless steel diaphragm as the force-bearing diaphragm 3 can further improve the durability of the force-bearing diaphragm 3.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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 battery pressure sensor, characterized in that, The device includes a detachably connected sensing component (1) and a package (2). The package (2) has a first end (21) and a second end (22) formed at opposite ends. An oil filling cavity (23) is formed in the hollow central area of ​​the package (2). The oil filling cavity (23) connects the first end (21) and the second end (22). The sensing component (1) is connected to the first end (21) and covers the oil filling cavity (23). A force-bearing diaphragm (3) is provided at the second end (22) and covers the oil filling cavity (23). The edge of the first end (21) extends outward to form a mounting portion (24). A first connecting surface (241) and a second connecting surface (242) are formed on opposite sides of the mounting portion (24). The first connecting surface (241) is located on the side of the mounting portion (24) away from the second end (22). The first connecting surface (241) is recessed in the direction close to the second connecting surface (242) to form a welding groove (243).

2. The battery pressure sensor according to claim 1, characterized in that, The sensing component (1) includes a circuit board (11), a sensing device (12) and a signal transmission device (13). The sensing device (12) and the signal transmission device (13) are respectively disposed on opposite sides of the circuit board (11). The circuit board (11) is connected to the first end (21). The sensing device (12) is located inside the oil injection cavity (23).

3. The battery pressure sensor according to claim 2, characterized in that, The circuit board (11) has an oil injection hole (111) in the center area. The oil injection hole (111) is located on one side of the sensing device (12), and the position of the oil injection hole (111) corresponds to the position of the oil injection cavity (23). A sealing member (112) for sealing the oil injection hole (111) is provided in the oil injection hole (111).

4. The battery pressure sensor according to claim 2, characterized in that, It also includes a connector (4), the edge of the circuit board (11) is provided with a first connection hole (113), the edge of the first end (21) is provided with a second connection hole (211), and the connector (4) passes through the first connection hole (113) and the second connection hole (211).

5. The battery pressure sensor according to claim 4, characterized in that, The connector (4) is a screw, the first connecting hole (113) is a through hole, the second connecting hole (211) is a blind hole, and the inner sidewall of the second connecting hole (211) has a threaded structure. The connector (4) passes through the first connecting hole (113) and is screwed to the second connecting hole (211).

6. The battery pressure sensor according to claim 4, characterized in that, The first end (21) is recessed in a direction close to the second end (22) to form an annular groove (25). The annular groove (25) is located between the oil injection cavity (23) and the second connecting hole (211). A sealing element (5) is provided in the annular groove (25). The sealing element (5) is interference-fitted to the circuit board (11).

7. The battery pressure sensor according to claim 6, characterized in that, The edge of the first end (21) protrudes in a direction away from the second end (22) to form a positioning post (212), and the edge of the circuit board (11) is provided with a positioning groove (114) corresponding to the position of the positioning post (212), and the positioning post (212) is inserted into the positioning groove (114).

8. The battery pressure sensor according to claim 1, characterized in that, The second end (22) is also provided with a reinforcing pad (6). The second end (22) and the reinforcing pad (6) are respectively connected to the opposite sides of the force-bearing diaphragm (3). The reinforcing pad (6) has a clearance hole (61) in the central area. The position of the clearance hole (61) corresponds to the position of the oil injection cavity (23).

9. The battery pressure sensor according to claim 8, characterized in that, The encapsulation component (2) is an aluminum alloy encapsulation component, and the reinforcing pad (6) is an aluminum alloy pad.

10. The battery pressure sensor according to claim 9, characterized in that, The force-bearing diaphragm (3) is a stainless steel diaphragm.

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