CN113984270A - Automobile battery embedded small-sized digital pressure sensor and manufacturing method thereof - Google Patents
Automobile battery embedded small-sized digital pressure sensor and manufacturing method thereof Download PDFInfo
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- CN113984270A CN113984270A CN202111170421.5A CN202111170421A CN113984270A CN 113984270 A CN113984270 A CN 113984270A CN 202111170421 A CN202111170421 A CN 202111170421A CN 113984270 A CN113984270 A CN 113984270A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B7/00—Microstructural systems; Auxiliary parts of microstructural devices or systems
- B81B7/0032—Packages or encapsulation
- B81B7/007—Interconnections between the MEMS and external electrical signals
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B7/00—Microstructural systems; Auxiliary parts of microstructural devices or systems
- B81B7/02—Microstructural systems; Auxiliary parts of microstructural devices or systems containing distinct electrical or optical devices of particular relevance for their function, e.g. microelectro-mechanical systems [MEMS]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B2201/00—Specific applications of microelectromechanical systems
- B81B2201/02—Sensors
- B81B2201/0264—Pressure sensors
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Computer Hardware Design (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses an embedded small digital pressure sensor of an automobile battery and a manufacturing method thereof.A pressure sensing chip is inversely arranged on the lower surface of a double-sided aluminum-based PCB of the pressure sensor, a pressure metal diaphragm is connected to the lower surface of the double-sided aluminum-based PCB by welding, an oil filling hole leading to the cavity of the pressure metal diaphragm is formed in the double-sided aluminum-based PCB, an oily medium is filled in the cavity of the pressure metal diaphragm, a sealing ball is arranged in the oil filling hole, a signal conditioning chip is attached to the upper surface of the double-sided aluminum-based PCB, a connector is also attached to the upper surface of the double-sided aluminum-based PCB, and the edge of the double-sided aluminum-based PCB is welded on a battery top cover. The pressure of the battery electrolyte can be squeezed to the medium through the pressure metal diaphragm, the medium transmits the pressure to the pressure sensing chip, and finally the pressure is transmitted to the control system of the automobile through the digital signal, so that the pressure and the temperature of the battery in the whole life cycle of the automobile battery from factory leaving to user use can be continuously monitored.
Description
Technical Field
The invention belongs to the technical field of pressure sensors, and particularly relates to an embedded small digital pressure sensor of an automobile battery and a manufacturing method thereof.
Background
With the rapid development of new energy, various industries have urgent requirements on energy collection, storage, safety monitoring and the like in the process of using the new energy. The traditional automobile battery is generally used at present as a safety switch reminding central control platform through a structure of machining an aluminum sheet on a top cover of the battery, when a user fails in use of the automobile, the user can find the battery through visual inspection of professional technical maintenance personnel in an automobile repair shop, but in essence, a safety alarm system of the battery is mechanical, and the battery cannot be monitored fundamentally and continuously in the whole closed-loop action with the internal change during working and dormancy.
Disclosure of Invention
The invention aims to solve the problems and provides an embedded small digital pressure sensor for an automobile battery and a manufacturing method thereof.
The technical scheme of the invention is realized in such a way.
The utility model provides an embedded small-size digital pressure sensor of car battery which characterized in that: comprises a double-sided aluminum-based PCB board, a pressure sensing chip is inversely arranged on the lower surface of the double-sided aluminum-based PCB board, a cap type pressure metal diaphragm is connected on the lower surface of the double-sided aluminum-based PCB board at the position of a cap edge by welding, the pressure sensing chip is positioned in the cavity of the pressure metal diaphragm, the double-sided aluminum-based PCB board is provided with an oil filling hole communicated with the cavity of the pressure metal diaphragm, the cavity of the pressure metal diaphragm is filled with an oily medium, a sealing ball is arranged in the oil filling hole, the upper surface subsides of two-sided aluminium base PCB board are equipped with the signal and take care of the chip, and the pad of signal taking care of the chip passes through gold thread and two-sided aluminium base PCB board electric connection, and two-sided aluminium base PCB board upper surface is again through the sealing layer with signal take care of the sealed ball cover in chip, gold thread and the oiling hole, still pastes on two-sided aluminium base PCB board upper surface and is equipped with the connector, the edge rewelding of two-sided aluminium base PCB board is on the battery top cap.
Further, the thickness of the double-sided aluminum-based PCB is 1 mm.
Furthermore, the pressure sensing chip is a Wheatstone bridge sensing chip, and the thickness of the pressure sensing chip is 0.3 mm.
Furthermore, the pressure metal diaphragm is made of aluminum materials, the thickness of the pressure metal diaphragm is 2-200 mu m, concave-convex points which are uniformly arranged and used for pressure release are arranged at the edge of the pressure-bearing surface, and the influence of the welding process on the deformation recovery of the diaphragm is effectively avoided.
Further, the diameter of the oil filling hole is 1 mm.
Further, the oily medium is silicone oil.
Further, the signal conditioning chip is of the type NSA 2300.
The manufacturing method of the embedded small digital pressure sensor of the automobile battery comprises the following steps:
(1) a round hole with the aperture equal to the thickness of the plate is formed in the middle of the double-sided aluminum-based PCB;
(2) a pressure induction chip is inversely arranged on the lower surface of the double-sided aluminum-based PCB;
(3) when the cap type pressure metal diaphragm is formed, concave-convex points which are uniformly arranged and used for pressure release are processed on the edge of a pressed surface, the cap edge is welded on the lower surface of the double-sided aluminum-based PCB through a laser welding process, and a circular hole in the middle of the double-sided aluminum-based PCB is led to the cavity of the pressure metal diaphragm;
(4) injecting an oily medium into the pressure metal diaphragm cavity by using a vacuum liquid injection machine, and riveting and sealing by using a sealing ball;
(5) cleaning the double-sided aluminum-based PCB by plasma, pasting a signal conditioning chip on the upper surface of the double-sided aluminum-based PCB, and welding a bonding pad of the signal conditioning chip with the double-sided aluminum-based PCB by using a gold wire;
(6) covering the signal conditioning chip, the gold wire and the sealing ball in the oil injection hole by using a sealing layer;
(7) attaching a connector on the double-sided aluminum-based PCB;
(8) and welding the edges of the double-sided aluminum-based PCB on the battery top cover by adopting a laser welding process.
The technical principle is as follows: the invention fills medium (silicon oil) in the pressure metal diaphragm, the pressure of the battery electrolyte extrudes the medium through the pressure metal diaphragm, the medium transmits the pressure to the pressure sensing chip, the pressure signal amplifies and calibrates the signal through the internal demodulation circuit, and the signal is transmitted to the control system of the automobile from the circuit board on the back of the packaging body by a digital signal. The sensor has the advantages that the sensor is designed to have aluminum which does not react with chemical lead-acid liquid as a base material, the material of the current machine is unchanged, but the material of the sensor is a stamping part, so the sensor is very suitable for large-scale production of packaging automation equipment, and the problem that the requirement on a safety film is high due to low industrial automation degree of the current traditional machining is solved. In the manufacturing process, the design adopts a laser welding process, so that the reliability of the sensor is solved. According to the implementation process, the designed pressure metal diaphragm is 2-200um thick, and the periphery of the diaphragm is provided with the concave-convex parts as pressure release points, so that the influence of the welding process on the deformation restorability of the diaphragm is effectively avoided.
The invention has the beneficial effects that: 1. according to the invention, the pressure metal diaphragm is filled with the medium, the pressure of the battery electrolyte extrudes the medium through the pressure metal diaphragm, the medium transmits the pressure to the pressure sensing chip, the pressure signal is amplified and calibrated through the internal demodulation circuit, and finally transmitted to the control system of the automobile as a digital signal, so that the pressure and the temperature of the battery in the whole life cycle from delivery to use of the automobile battery to a user can be continuously monitored, and the pressure in the cavity of the automobile battery is monitored in real time to provide alarm information for the user in time, thereby reducing the safety fault of the user when going out. 2. The safety alarm system completely replaces the traditional mechanical battery, and solves the problem that the safety membrane of the traditional pure mechanical battery safety alarm system is limited by extremely high industrial automation processing requirements. 3. In the manufacturing process, the reliability of the sensor is solved by adopting a laser welding process.
Drawings
Fig. 1 is a schematic structural view of the pressure sensor of the present invention.
Fig. 2 is a top view of the pressure sensor of the present invention.
Fig. 3 is a schematic circuit diagram of the pressure sensor of the present invention.
FIG. 4 is a flow chart of a method of making a pressure sensor according to the present invention.
In the figure, the double-sided aluminum-based PCB comprises a double-sided aluminum-based PCB (printed circuit board) 1, a pressure sensing chip 2, a pressure metal diaphragm 3, a pressure metal diaphragm 4, an oil filling hole 5, an oily medium 6, a sealing ball 7, a signal conditioning chip 8, a gold thread 9, a sealing layer 10, a connector 11, a battery top cover 12 and concave-convex points.
Detailed Description
The technical solution of the present invention will be further described in detail by the following examples and the drawings attached to the specification.
As shown in the figures 1 and 2, the embedded small digital pressure sensor for the automobile battery comprises a double-sided aluminum-based PCB (printed circuit board) 1, wherein a pressure sensing chip 2 is inversely arranged on the lower surface of the double-sided aluminum-based PCB 1, a cap-type pressure metal diaphragm 3 is connected to the lower surface of the double-sided aluminum-based PCB 1 at the position of a cap edge in a welding manner, the pressure sensing chip 2 is positioned in a cavity of the pressure metal diaphragm 3, an oil filling hole 4 leading to the cavity of the pressure metal diaphragm 3 is formed in the double-sided aluminum-based PCB 1, an oily medium 5 is filled in the cavity of the pressure metal diaphragm 3, a sealing ball 6 is arranged in the oil filling hole 4, a signal conditioning chip 7 is attached to the upper surface of the double-sided aluminum-based PCB 1, a bonding pad of the signal conditioning chip 7 is electrically connected with the double-sided aluminum-based PCB 1 through a gold wire 8, and the signal conditioning chip 7, the sealing layer 9 is used for sealing the upper surface of the double-sided aluminum-based PCB 1, The gold thread 8 and the sealing ball 6 in the oil filler point 4 cover, still paste on the double-sided aluminium base PCB board 1 upper surface and be equipped with connector 10, the edge rewelding of double-sided aluminium base PCB board 1 is on battery top cap 11.
The thickness h1 of the double-sided aluminum-based PCB board 1 is 1 mm.
The pressure sensing chip 2 is a Wheatstone bridge sensing chip and has a thickness of 0.3 mm.
The pressure metal diaphragm 3 is made of aluminum materials, the thickness h2 is 2-200 mu m, concave-convex points 12 which are uniformly arranged and used for pressure release are arranged at the edge of the pressure-receiving surface, and the influence of the deformation recovery of the diaphragm caused by a welding process is effectively avoided.
The diameter of the oil filling hole 4 is 1 mm.
The oily medium 5 is silicone oil.
The model of the analog-digital signal conditioning chip 7 is NSA 2300. The connection relationship with the pressure sensing chip 2 and the circuit schematic diagram are shown in fig. 3.
As shown in fig. 4, the method for manufacturing the embedded small digital pressure sensor of the automobile battery of the invention comprises the following steps:
(1) a round hole with the aperture equal to the thickness of the plate is formed in the middle of the double-sided aluminum-based PCB 1;
(2) a pressure induction chip 2 is inversely arranged on the lower surface of the double-sided aluminum-based PCB board 1;
(3) when the cap type pressure metal diaphragm 3 is formed, concave-convex points 12 which are uniformly arranged and used for pressure release are processed on the edge of a pressed surface, the cap edge is welded on the lower surface of the double-sided aluminum-based PCB 1 through a laser welding process, and a circular hole in the middle of the double-sided aluminum-based PCB 1 is communicated with a cavity of the pressure metal diaphragm 3;
(4) injecting an oily medium 5 into the cavity of the pressure metal diaphragm 3 by using a vacuum liquid injection machine, and riveting and sealing by using a sealing ball 6;
(5) cleaning the double-sided aluminum-based PCB board 1 by plasma, pasting a signal conditioning chip 7 on the upper surface of the double-sided aluminum-based PCB board, and welding a bonding pad of the signal conditioning chip 7 with the double-sided aluminum-based PCB board 1 by using a gold wire 8;
(6) the signal conditioning chip 7, the gold wire 8 and the sealing ball 6 in the oil injection hole 4 are covered by a sealing layer 9;
(7) attaching a connector 10 on the double-sided aluminum-based PCB 1;
(8) and welding the edge of the double-sided aluminum-based PCB (printed Circuit Board) 1 on the battery top cover 11 by adopting a laser welding process.
The invention pastes a pressure sensing chip 2 of a Wheatstone bridge and a signal conditioning chip 7 on a double-sided aluminum-based PCB board 1, the bonding pad on the signal conditioning chip 7 is led to the double-sided aluminum-based PCB board 1 through the binding gold thread 8, the pressure metal diaphragm 3 is fixed with the double-sided aluminum-based PCB board 1 through welding to form a cavity, the double-sided aluminum-based PCB board 1 is provided with an oil filling hole 4 leading to the cavity, an oily medium 5 (silicon oil) is injected into the cavity from the oil injection hole 4 by a vacuum injection method, the cavity is sealed by a sealing ball 6, the pressure of the battery electrolyte extrudes the oily medium 5 through a pressure metal diaphragm 3, the oily medium 5 transmits the pressure to a pressure sensing chip 2, a pressure signal of the pressure sensing chip 2 passes through an internal demodulation circuit by a signal conditioning chip 7, the signal is amplified and calibrated, and finally the signal is transmitted to a control system of the automobile as a digital signal.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. The utility model provides an embedded small-size digital pressure sensor of car battery which characterized in that: comprises a double-sided aluminum-based PCB board, a pressure sensing chip is inversely arranged on the lower surface of the double-sided aluminum-based PCB board, a cap type pressure metal diaphragm is connected on the lower surface of the double-sided aluminum-based PCB board at the position of a cap edge by welding, the pressure sensing chip is positioned in the cavity of the pressure metal diaphragm, the double-sided aluminum-based PCB board is provided with an oil filling hole communicated with the cavity of the pressure metal diaphragm, the cavity of the pressure metal diaphragm is filled with an oily medium, a sealing ball is arranged in the oil filling hole, the upper surface subsides of two-sided aluminium base PCB board are equipped with the signal and take care of the chip, and the pad of signal taking care of the chip passes through gold thread and two-sided aluminium base PCB board electric connection, and two-sided aluminium base PCB board upper surface is again through the sealing layer with signal take care of the sealed ball cover in chip, gold thread and the oiling hole, still pastes on two-sided aluminium base PCB board upper surface and is equipped with the connector, the edge rewelding of two-sided aluminium base PCB board is on the battery top cap.
2. The embedded miniature digital pressure sensor of automobile battery of claim 1, wherein: the thickness of the double-sided aluminum-based PCB is 1 mm.
3. The embedded miniature digital pressure sensor of automobile battery of claim 1, wherein: the pressure sensing chip is a Wheatstone bridge sensing chip and is 0.3mm thick.
4. The embedded miniature digital pressure sensor of automobile battery of claim 1, wherein: the pressure metal diaphragm is made of aluminum materials, the thickness of the pressure metal diaphragm is 2-200 mu m, and concave and convex points which are uniformly arranged and used for pressure release are arranged on the edge of the pressure surface.
5. The embedded miniature digital pressure sensor of automobile battery of claim 1, wherein: the diameter of the oil filling hole is 1 mm.
6. The embedded miniature digital pressure sensor of automobile battery of claim 1, wherein: the oily medium is silicone oil.
7. The embedded miniature digital pressure sensor of automobile battery of claim 1, wherein: the model of the signal conditioning chip is NSA 2300.
8. A manufacturing method of an embedded small digital pressure sensor of an automobile battery is characterized by comprising the following steps:
(1) a round hole with the aperture equal to the thickness of the plate is formed in the middle of the double-sided aluminum-based PCB;
(2) a pressure induction chip is inversely arranged on the lower surface of the double-sided aluminum-based PCB;
(3) when the cap type pressure metal diaphragm is formed, concave-convex points which are uniformly arranged and used for pressure release are processed on the edge of a pressed surface, the cap edge is welded on the lower surface of the double-sided aluminum-based PCB through a laser welding process, and a circular hole in the middle of the double-sided aluminum-based PCB is led to the cavity of the pressure metal diaphragm;
(4) injecting an oily medium into the pressure metal diaphragm cavity by using a vacuum liquid injection machine, and riveting and sealing by using a sealing ball;
(5) cleaning the double-sided aluminum-based PCB by plasma, pasting a signal conditioning chip on the upper surface of the double-sided aluminum-based PCB, and welding a bonding pad of the signal conditioning chip with the double-sided aluminum-based PCB by using a gold wire;
(6) covering the signal conditioning chip, the gold wire and the sealing ball in the oil injection hole by using a sealing layer;
(7) attaching a connector on the double-sided aluminum-based PCB;
(8) and welding the edges of the double-sided aluminum-based PCB on the battery top cover by adopting a laser welding process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111170421.5A CN113984270A (en) | 2021-10-08 | 2021-10-08 | Automobile battery embedded small-sized digital pressure sensor and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111170421.5A CN113984270A (en) | 2021-10-08 | 2021-10-08 | Automobile battery embedded small-sized digital pressure sensor and manufacturing method thereof |
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| Publication Number | Publication Date |
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| CN113984270A true CN113984270A (en) | 2022-01-28 |
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| CN202111170421.5A Pending CN113984270A (en) | 2021-10-08 | 2021-10-08 | Automobile battery embedded small-sized digital pressure sensor and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116224095A (en) * | 2023-05-05 | 2023-06-06 | 深圳市迈姆斯科技有限公司 | Sensor for detecting internal pressure and temperature of battery, lithium battery and method |
-
2021
- 2021-10-08 CN CN202111170421.5A patent/CN113984270A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116224095A (en) * | 2023-05-05 | 2023-06-06 | 深圳市迈姆斯科技有限公司 | Sensor for detecting internal pressure and temperature of battery, lithium battery and method |
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