Cells and lithium batteries with sensors attached

Abstract

The present application discloses a cell and a lithium battery with a sensor, the cell includes an electrolyte, a silicon substrate, a microelectromechanical sensor mounted on the silicon substrate and electrically connected to the silicon substrate, a signal processing chip mounted on the silicon substrate and located at the side of the microelectromechanical sensor, electrically connected to the silicon substrate and the microelectromechanical sensor, and a stress diaphragm mounted above the microelectromechanical sensor, one side of which contacts the microelectromechanical sensor and the other side of which contacts the electrolyte in the cell, for detecting temperature and / or pressure data inside the cell. An embodiment of the present application senses and obtains pressure data of the cell by mounting a stress diaphragm on the microelectromechanical sensor, and obtains temperature data inside the cell, and then uses the signal processing chip to perform analysis output on the pressure data and temperature data, thereby obtaining the current safety indicator of the lithium battery, and further determining whether to take relevant safety measures for the lithium battery, to ensure the safety of the lithium battery.

Description

[Technical field]

[0001] (cross reference) This application claims priority to a Chinese patent application filed with the China Patent Office on April 13, 2023, bearing application number 202310392917.X and entitled "Sensor-Mounted Cell and Lithium Battery," the entire contents of which are incorporated herein by reference.

[0002] (Technical field) This application relates to the field of lithium battery technology, and in particular to cells and lithium batteries having sensors attached thereto. [Background technology]

[0003] With the diversification of global energy collection methods, each country in the world is exploring more ways in terms of electric energy collection and storage. For example, traditional transportation gradually adopts the conversion from electric energy drive to lithium electric drive, and the energy storage and drive modes of electronic industry products are increasing geometrically and quickly penetrating the automobile and energy storage power station markets. The inventors realize that with the rapid development of the industry, the requirements for the safety of lithium electric products are gradually increasing. Therefore, how to ensure the safety of lithium electric products is a problem that those skilled in the art should solve. Summary of the Invention [Problem to be solved by the invention]

[0004] The embodiment of the present application aims to provide a cell equipped with a sensor and collect pressure and temperature data inside the lithium battery to determine the safety state of the lithium battery, thereby achieving the effect of ensuring the safety of the lithium battery. [Means for solving the problem]

[0005] An embodiment of the present application is a cell containing an electrolyte and having a sensor attached thereto, A silicon substrate; a microelectromechanical sensor disposed on the silicon substrate and electrically connected to the silicon substrate; a signal processing chip disposed on the silicon substrate and positioned on the side of the microelectromechanical sensor, the signal processing chip being electrically connected to the silicon substrate and the microelectromechanical sensor; A sensor-mounted cell is provided, the cell including a stress diaphragm disposed above the microelectromechanical sensor and having one side in contact with the microelectromechanical sensor and another side in contact with an electrolyte in the cell, for detecting temperature and / or pressure data inside the cell.

[0006] Furthermore, a Wheatstone bridge is attached to the silicon substrate, and the signal processing chip is connected to the output terminal of the Wheatstone bridge.

[0007] Furthermore, the symmetrical resistance value of the Wheatstone bridge is 100Ω to 1000Ω.

[0008] Furthermore, the signal processing chip is an analog-to-digital converter.

[0009] Furthermore, the conversion range of the analog-to-digital converter is 10 bits to 32 bits.

[0010] Furthermore, the signal processing chip is provided with one or more standard communication protocols, and the standard communication protocols are an IIC protocol, an SPI protocol, or a TTL protocol.

[0011] Furthermore, the micro-electromechanical sensor and / or signal processing chip are embedded into the silicon substrate by using automatic laser welding or piezo-resistive embedded welding.

[0012] Furthermore, the material of the micro-electro-mechanical sensor is single crystal silicon.

[0013] Furthermore, the material of the stress diaphragm is an aluminum material.

[0014] An embodiment of the present application further provides a lithium battery including a cell having attached thereto any of the above described sensors. Effect of the Invention

[0015] The present application provides a cell and a lithium battery with a sensor, the cell includes an electrolyte, a silicon substrate, a microelectromechanical sensor mounted on the silicon substrate and electrically connected to the silicon substrate, a signal processing chip mounted on the silicon substrate and located on the side of the microelectromechanical sensor, electrically connected to the silicon substrate and the microelectromechanical sensor, and a stress diaphragm mounted above the microelectromechanical sensor, one side of which contacts the microelectromechanical sensor and the other side of which contacts the electrolyte in the cell, for detecting temperature and / or pressure data inside the cell. The present application provides a stress diaphragm on the microelectromechanical sensor to sense and obtain pressure data of the cell, and obtain temperature data inside the cell through the stress diaphragm, and then use the signal processing chip to perform analysis output on the pressure data and temperature data, thereby obtaining the current safety indicator of the lithium battery, and then determining whether to take relevant safety measures for the lithium battery based on the safety indicator, to ensure the safety of the lithium battery. [Brief description of the drawings]

[0016] In the following, in order to more clearly describe the technical solutions of the embodiments of the present application, drawings that need to be used in the description of the embodiments are briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without any creative efforts.

[0017] [Figure 1] FIG. 2 is a structural schematic diagram of a cell equipped with a sensor provided in an embodiment of the present application. [Diagram 2] FIG. 2 is an exploded schematic diagram of a cell equipped with a sensor provided in an embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without any creative efforts are all within the scope of protection of the present application.

[0019] It should be understood that, as used in this specification and the appended claims, the terms "comprise" and "comprising" indicate the presence of stated features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof.

[0020] It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of the present application. As used in the present specification and claims, the singular forms "a," "one," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0021] It should be further understood that the term "and / or" as used in the specification and appended claims means and includes any and all possible combinations of one or more of the associated listed items.

[0022] Referring now to FIG. 1 and FIG. 2, an embodiment of the present application is a cell containing an electrolyte and having a sensor attached thereto, A silicon substrate 1; A microelectromechanical sensor 2 is disposed on the silicon substrate 1 and electrically connected to the silicon substrate 1; a signal processing chip 3 disposed on the silicon substrate 1 and located on the side of the microelectromechanical sensor 2, and electrically connected to the silicon substrate 1 and the microelectromechanical sensor 2; A sensor-mounted cell is provided, the sensor-mounted cell including a stress diaphragm 4 disposed above the microelectromechanical sensor 2 and having one side in contact with the microelectromechanical sensor 2 and the other side in contact with the electrolyte in the cell, for detecting temperature and / or pressure data inside the cell.

[0023] In this embodiment, the cell, in addition to the normal structure, such as electrolyte, positive and negative electrodes, is further provided with the silicon substrate 1, a microelectromechanical sensor 2 and a signal processing chip 3 are provided on the silicon substrate 1, and a stress diaphragm 4 is provided on the microelectromechanical sensor 2, with both sides of the stress diaphragm 4 contacting the microelectromechanical sensor 2 and the electrolyte in the cell, respectively. By providing the stress diaphragm 4 on the microelectromechanical sensor 2, the pressure data of the cell is sensed and obtained, and the temperature data in the cell is obtained by the stress diaphragm 4. Then, the signal processing chip 3 is used to perform analysis and output on the pressure data and the temperature data, thereby obtaining the current safety indicators of the lithium battery, and then determining whether to take relevant safety measures for the lithium battery according to the safety indicators, so as to ensure the safety of the lithium battery.

[0024] In this embodiment, based on the smart sensor method, the smart collection and measurement method is extended to fields including but not limited to lithium battery cells and energy storage battery cells, and a dynamic monitoring implementation means for various applied data collection and safety is scientifically formed. In addition, the detection method (i.e., obtaining and detecting pressure and temperature data) in the cell provided in this embodiment can also be applied to the process of using electric energy in different chemical reactions, and the output of the signal processing chip 3 in the cell can be temperature data corresponding to the actual temperature of the internal electrolyte, pressure data corresponding to the real-time measurement of pressure alone, or a comprehensive measurement that simultaneously outputs temperature and pressure in real time, i.e., temperature data and pressure data. The cell provided in this embodiment can very flexibly solve the pain points in the market and effectively help users collect data in various environments such as driving a car, using power through energy storage, and charging, discharging, and power outages of other electric energy. Of course, in a specific application process, the microelectromechanical sensor 2 can be one or more, for example, several to several hundred microelectromechanical sensors 2 form one neural network. In addition, the cell of this embodiment can achieve the effect of collecting and detecting in real time, that is, the collected data has the characteristics of uniqueness, real-time dynamic, independent possibility, and integrated possibility. Furthermore, the output form of the temperature data and pressure data can be active continuous output, independent passive output, and high-precision mode output, that is, the cell and lithium battery provided in this embodiment have mass production possibility and very wide commercial practical value. In addition, the cell provided in this embodiment does not require strong restrictive definitions on the chip layout, mounting, medium, diaphragm shape, substrate material, etc.

[0025] In a specific embodiment, a Wheatstone bridge 5 is attached to the silicon substrate 1, and the signal processing chip 3 is connected to the output terminal of the Wheatstone bridge 5. The symmetrical resistance value of the Wheatstone bridge 5 is 100Ω to 1000Ω. Furthermore, the material of the micro-electro-mechanical sensor 2 is single crystal silicon. The material of the stress diaphragm 4 is aluminum.

[0026] The cell described in this embodiment can be completed by a bonding process between a silicon substrate 1 of one Wheatstone bridge 5 and high purity single crystal silicon, and the symmetrical resistance value of the Wheatstone bridge 5 can be realized by ion implantation of 100 ohms to 10,000 ohms, and the two ends of the output of the Wheatstone bridge 5 can be compensated for the temperature drift that causes the change in the output Wheatstone internal resistance due to temperature change by a method such as temperature compensation. Of course, in other embodiments, the cell can be realized by a pole piece that makes a capacitor in one silicon material, which has higher noise due to the effect of temperature on the linearity of the pressure output. Furthermore, the material of the microelectromechanical sensor 2 in this embodiment is single crystal silicon, and the circuit is designed and manufactured by taking the resistance of the Wheatstone bridge 5 without temperature drift as an example, and evaluating the measurement of temperature and pressure to ensure the feasibility and manufacturability of this embodiment.

[0027] In a specific embodiment, the signal processing chip 3 is an analog-to-digital converter. The conversion range of the analog-to-digital converter is 10 bits to 32 bits. The signal processing chip 3 is equipped with one or more standard communication protocols, and the standard communication protocol is an IIC protocol, an SPI protocol, or a TTL protocol.

[0028] This embodiment adds a 24-bit analog-to-digital converter to the output end of the Wheatstone bridge 5, and from the viewpoint of science and technology, the converter can be applied from 10 bits to 32 bits in principle, the converter can be written once, written finitely, or written infinitely (theoretical value, that is, multiple writing mode), and the converter has one or more standard communication protocols, such as two-wire IIC protocol, three-wire SPI protocol, or single-wire TTL protocol. In a specific application scenario, this embodiment uses the single output mode of two-wire IIC protocol and three-wire SPI protocol to make a sample, and naturally, this does not represent that other data transmission modes are not within the scope of application of this embodiment.

[0029] In addition, the connection between the microelectromechanical sensor 2 and the signal processing chip 3 may be by pure gold, alloy, or copper wire, aluminum wire, silver wire, etc., or balls are mounted on the chip to realize the electrical connection by a new flip chip technology. This embodiment provides a method and feasible logic for measuring pressure and temperature inside a cell, which has innovative aspects in many aspects such as materials, signal collection, operational amplifiers, noise processing, temperature elimination, linear compensation, chemical reaction compatibility, and packaging methods, and has the advantages of low cost, high accuracy, fast response, and can be made into corresponding secondary packaging according to material compatibility and user structure.

[0030] Furthermore, the micro-electromechanical sensor 2 and / or the signal processing chip 3 are embedded in the silicon substrate 1 by adopting automatic laser welding or piezo-resistance embedded welding.

[0031] The conventional measurement method is a physical safety air escape and externally attached isolated temperature measurement, which does not have standard installation conditions, and has many shortcomings such as complicated external wiring, slow signal response, and troublesome peripheral digital processing. This embodiment can be mass-produced with high strength internal embedding by automatic laser welding or piezo-resistance embedding welding, which has a series of advantages such as high reliability, digital real-time, cost reduction, and chemical compatibility. To be more specific, the chemical compatibility of this embodiment is based on the chemical reaction in the charging and discharging process of the electrolyte, and in the electrochemical process of lithium ions, the gas generated and the heat release associated with high temperature are inevitable, and the electrolyte itself has the characteristics of high strength corrosion during electrochemistry. This embodiment uses the global universal cell aluminum as a pressure medium, and due to the contactability of the hard medium, the pressure of the gas and liquid mixed inside the cell is digitized without error and output with high precision, thereby improving the data detection accuracy and improving the security level of the lithium battery.

[0032] An embodiment of the present application further provides a lithium battery including a cell having attached thereto any of the above described sensors.

[0033] Each embodiment in the specification is described in a stepwise manner, and each embodiment mainly describes the differences with other embodiments, and the same or similar parts between each embodiment can be referred to each other. The system disclosed in the embodiment corresponds to the method disclosed in the embodiment, so the description is simple, and the relevant part can be referred to the description of the part of the method. It should be noted that a person skilled in the art can make some improvements and modifications to the application without departing from the principle of the application, and these improvements and modifications are also included in the scope of protection of the claims of the application.

[0034] It should be noted that, in this specification, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not require or imply the existence of any such actual relationship or order between those entities or operations. Also, the terms "comprise", "comprise", or any other variation thereof are intended to include a non-exclusive inclusion, whereby a process, method, article, or device that includes a set of elements not only includes those elements, but also includes other elements not expressly listed or includes elements inherent in such process, method, article, or device. In the absence of more limitations, an element qualified by the phrase "comprises a ..." does not exclude the presence of further identical elements in the process, method, article, or device that includes said element.

[0035] (Additional Note) (Appendix 1) A cell containing an electrolyte and having a sensor attached thereto, A silicon substrate; a microelectromechanical sensor disposed on the silicon substrate and electrically connected to the silicon substrate; a signal processing chip mounted on the silicon substrate and located on the side of the microelectromechanical sensor, electrically connected to the silicon substrate and the microelectromechanical sensor, wherein a Wheatstone bridge is attached to the silicon substrate, and the signal processing chip is connected to an output end of the Wheatstone bridge; a stress diaphragm disposed above the microelectromechanical sensor, one side of which is in contact with the microelectromechanical sensor and the other side of which is in contact with the electrolyte in the cell, for detecting temperature and / or pressure data inside the cell, the material of the stress diaphragm being an aluminum material; The microelectromechanical sensor and / or signal processing chip are embedded in the silicon substrate by automatic laser welding or piezo-resistance embedding welding; The cell with the sensor installed.

[0036] (Appendix 2) The symmetrical resistance value of the Wheatstone bridge is 100Ω to 1000Ω. A cell fitted with the sensor described in Appendix 1.

[0037] (Appendix 3) The signal processing chip is an analog-to-digital converter; A cell fitted with the sensor described in Appendix 1.

[0038] (Appendix 4) The conversion range of the analog-to-digital converter is 10 bits to 32 bits. A cell fitted with the sensor described in Appendix 3.

[0039] (Appendix 5) The signal processing chip has one or more standard communication protocols, and the standard communication protocol is an IIC protocol, an SPI protocol, or a TTL protocol; A cell fitted with the sensor described in Appendix 1.

[0040] (Appendix 6) The material of the microelectromechanical sensor is single crystal silicon; A cell fitted with the sensor described in Appendix 1.

[0041] (Appendix 7) A silicon substrate; a microelectromechanical sensor disposed on the silicon substrate and electrically connected to the silicon substrate; a signal processing chip mounted on the silicon substrate and located on the side of the microelectromechanical sensor, electrically connected to the silicon substrate and the microelectromechanical sensor, wherein a Wheatstone bridge is attached to the silicon substrate, and the signal processing chip is connected to an output end of the Wheatstone bridge; a stress diaphragm disposed above the microelectromechanical sensor, one side of which is in contact with the microelectromechanical sensor and the other side of which is in contact with the electrolyte in the cell, for detecting temperature and / or pressure data inside the cell, the material of the stress diaphragm being an aluminum material; The microelectromechanical sensor and / or signal processing chip are embedded in the silicon substrate by automatic laser welding or piezo-resistance embedding welding; Lithium battery.

[0042] (Appendix 8) The symmetrical resistance value of the Wheatstone bridge is 100Ω to 1000Ω. 7. A lithium battery as described in Appendix 7.

[0043] (Appendix 9) The signal processing chip is an analog-to-digital converter; 7. A lithium battery as described in Appendix 7.

[0044] (Appendix 10) The conversion range of the analog-to-digital converter is 10 bits to 32 bits. 9. A lithium battery as described in claim 9.

[0045] (Appendix 11) The signal processing chip has one or more standard communication protocols, and the standard communication protocol is an IIC protocol, an SPI protocol, or a TTL protocol; 7. A lithium battery as described in Appendix 7.

[0046] (Appendix 12) The material of the microelectromechanical sensor is single crystal silicon; 7. A lithium battery as described in Appendix 7.

Claims

1. A cell containing an electrolyte and having a sensor attached thereto, A silicon substrate; a microelectromechanical sensor disposed on the silicon substrate and electrically connected to the silicon substrate; a signal processing chip mounted on the silicon substrate and located on the side of the microelectromechanical sensor, electrically connected to the silicon substrate and the microelectromechanical sensor, wherein a Wheatstone bridge is attached to the silicon substrate, and the signal processing chip is connected to an output end of the Wheatstone bridge; a stress diaphragm disposed above the microelectromechanical sensor, one side of which is in contact with the microelectromechanical sensor and the other side of which is in contact with the electrolyte in the cell, for detecting temperature and / or pressure data inside the cell, the material of the stress diaphragm being an aluminum material; The microelectromechanical sensor and / or signal processing chip is embedded in the silicon substrate by automatic laser welding or piezo-resistance embedded welding; The cell with the sensor installed.

2. The symmetrical resistance value of the Wheatstone bridge is 100Ω to 1000Ω; A cell having the sensor of claim 1 attached thereto.

3. The signal processing chip is an analog-to-digital converter; A cell having the sensor of claim 1 attached thereto.

4. The conversion range of the analog-to-digital converter is 10 bits to 32 bits. A cell having the sensor of claim 3 attached thereto.

5. The signal processing chip has one or more standard communication protocols, and the standard communication protocol is an IIC protocol, an SPI protocol, or a TTL protocol; A cell having the sensor of claim 1 attached thereto.

6. The material of the microelectromechanical sensor is single crystal silicon; A cell having the sensor of claim 1 attached thereto.

7. A silicon substrate; a microelectromechanical sensor disposed on the silicon substrate and electrically connected to the silicon substrate; a signal processing chip mounted on the silicon substrate and located on the side of the microelectromechanical sensor, electrically connected to the silicon substrate and the microelectromechanical sensor, wherein a Wheatstone bridge is attached to the silicon substrate, and the signal processing chip is connected to an output end of the Wheatstone bridge; a stress diaphragm disposed above the microelectromechanical sensor, one side of which is in contact with the microelectromechanical sensor and the other side of which is in contact with the electrolyte in the cell, for detecting temperature and / or pressure data inside the cell, the material of the stress diaphragm being an aluminum material; The microelectromechanical sensor and / or signal processing chip is embedded in the silicon substrate by automatic laser welding or piezo-resistance embedded welding; Lithium battery.

8. The symmetrical resistance value of the Wheatstone bridge is 100Ω to 1000Ω; 8. The lithium battery of claim 7.

9. The signal processing chip is an analog-to-digital converter; 8. The lithium battery of claim 7.

10. The conversion range of the analog-to-digital converter is 10 bits to 32 bits.

10. The lithium battery of claim 9.

11. The signal processing chip has one or more standard communication protocols, and the standard communication protocol is an IIC protocol, an SPI protocol, or a TTL protocol; 8. The lithium battery of claim 7.

12. The material of the microelectromechanical sensor is single crystal silicon; 8. The lithium battery of claim 7.

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