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 the priority of a Chinese patent application filed with the Chinese Patent Office on April 13, 2023, with an application number of 202310392917.X and an invention title of "Cell with Sensor Attached and Lithium Battery", and all of its contents are incorporated herein by reference.

[0002] (Technical Field) This application relates to the field of lithium battery technology, and particularly to a cell with a sensor attached and a lithium battery.

Background Art

[0003] With the diversification of global energy collection methods, countries around the world are exploring more methods in aspects such as the collection and storage of electrical energy. For example, in conventional transportation, the conversion from driving by electrical energy to driving by lithium electricity is gradually being adopted, and the energy storage and driving methods of electronic industry products have increased geometrically and rapidly penetrated into the markets of automobiles and energy storage power plants. The inventors have recognized that with the rapid development of the industry, the requirements for the safety of lithium electricity products are gradually increasing. Therefore, how to ensure the safety of lithium electricity products is a problem that those skilled in the art should solve.

Summary of the Invention

Problems to be Solved by the Invention

[0004] Embodiments of this application provide a cell with a sensor attached, and aim to achieve the effect of judging the safety state of a lithium battery by collecting the pressure and temperature data inside the lithium battery and ensuring the safety of the lithium battery.

Means for Solving the Problems

[0005] Embodiments of this application are cells with sensors attached, including an electrolyte, a silicon substrate, A minute electromechanical sensor is installed on the silicon substrate and electrically connected to the silicon substrate, A signal processing chip is installed on the silicon substrate and located on the side of the micro-electromechanical sensor, and is electrically connected to the silicon substrate and the micro-electromechanical sensor, respectively. A sensor-equipped cell is provided, which includes a stress diaphragm positioned above the micro-electromechanical sensor, with one side in contact with the micro-electromechanical sensor and the other side in contact with the electrolyte inside the cell, for detecting temperature and / or pressure data inside the cell.

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

[0007] Furthermore, the symmetrical resistance of the Wheatstone bridge is between 100Ω and 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 includes one or more standard communication protocols, the standard communication protocols being the IIC protocol, SPI protocol, or TTL protocol.

[0011] Furthermore, the micro-electromechanical sensor and / or signal processing chip are embedded in the silicon substrate using an automated laser welding method or a piezoresistive embedding welding method.

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

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

[0014] Embodiments of the present invention further provide a lithium battery including a cell to which any of the sensors described above is attached. [Effects of the Invention]

[0015] Embodiments of the present invention provide a cell with a sensor attached and a lithium battery, the cell containing an electrolyte and comprising 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 and electrically connected to the silicon substrate and the microelectromechanical sensor, respectively, and a stress diaphragm mounted above the microelectromechanical sensor, with one side in contact with the microelectromechanical sensor and the other side in contact with the electrolyte in the cell, for detecting temperature and / or pressure data inside the cell. Embodiments of the present invention sense and acquire pressure data of the cell by mounting a stress diaphragm on the microelectromechanical sensor, acquire temperature data inside the cell by the stress diaphragm, and then use the signal processing chip to perform analysis output on the pressure data and temperature data, thereby obtaining a current safety indicator of the lithium battery, and further confirming whether or not to take relevant safety measures for the lithium battery based on the safety indicator, thereby ensuring the safety of the lithium battery. [Brief explanation of the drawing]

[0016] To more clearly explain the technical solutions of the embodiments of the present application, the drawings that need to be used in describing the embodiments are briefly introduced below. Clearly, 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 without any creative effort.

[0017] [Figure 1] This is a schematic diagram of the structure of a cell to which the sensor provided in the embodiment of the present invention is attached. [Figure 2] This is a schematic exploded view of a cell to which the sensor provided in the embodiment of the present invention is attached.

Best Mode for Carrying Out the Invention

[0018] Hereinafter, referring to the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0019] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described 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 their combinations.

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

[0021] It should be further understood that the term "and / or" used in the specification and appended claims of the present application means any combination and all possible combinations of one or more of the related listed items, including these combinations.

[0022] Hereinafter, referring to FIGS. 1 and 2, an embodiment of the present application is a cell with a sensor attached, including an electrolytic solution, a silicon substrate 1, a microelectromechanical sensor 2 installed on the silicon substrate 1 and electrically connected to the silicon substrate 1, A signal processing chip 3 that is installed on the silicon substrate 1 and located on the side of the microelectromechanical sensor 2, and is electrically connected to the silicon substrate 1 and the microelectromechanical sensor 2 respectively, A stress diaphragm 4 that is installed above the microelectromechanical sensor 2, one side of which contacts the microelectromechanical sensor 2 and the other side contacts the electrolytic solution in the cell, and is used to detect the temperature and / or pressure data inside the cell. A cell with a sensor attached is provided.

[0023] In this embodiment, in addition to including a normal structure such as an electrolytic solution, positive and negative electrodes, etc., the silicon substrate 1 is further installed. The microelectromechanical sensor 2 and the signal processing chip 3 are installed on the silicon substrate 1. Further, the stress diaphragm 4 is installed on the microelectromechanical sensor 2, and both sides of the stress diaphragm 4 are respectively contacted with the microelectromechanical sensor 2 and the electrolytic solution in the cell. In this way, by installing the stress diaphragm 4 on the microelectromechanical sensor 2, the pressure data of the cell is sensed and obtained, and moreover, the temperature data inside the cell is obtained by the stress diaphragm 4. Subsequently, 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 index of the lithium battery, and further confirming whether to take relevant safety measures for the lithium battery based on the safety index, so as to ensure the safety of the lithium battery.

[0024] This embodiment extends the application of smart collection and measurement methods based on smart sensor technology to fields including but not limited to lithium battery cells and energy storage battery cells, scientifically forming dynamic monitoring means for various data collection and safety applications. Furthermore, the detection method in the cell provided in this embodiment (i.e., acquiring and detecting pressure and temperature data) can be applied to the electrical energy utilization process in different chemical reactions. Moreover, the output of the signal processing chip 3 in the cell may be temperature data corresponding to the actual temperature of the internal electrolyte, pressure data corresponding to real-time pressure measurement, or even a comprehensive measurement outputting temperature and pressure simultaneously in real time, i.e., temperature and pressure data. The cell provided in this embodiment flexibly solves market pain points and can effectively assist in data collection in various environments such as user car driving, power utilization from energy storage, and other electrical energy charging, discharging, and power outages. Naturally, in a specific application process, the micro-electromechanical sensor 2 may be one or multiple; for example, several to several hundred micro-electromechanical sensors 2 may constitute a single neural network. Furthermore, the cell of this embodiment can achieve the effect of real-time collection and detection, meaning that the collected data has characteristics such as uniqueness, real-time dynamism, individuality, and synergy. In addition, the output format of temperature data and pressure data may be active continuous output, single passive output, or high-precision mode output, meaning that the cell and lithium battery provided in this embodiment have mass-producibility and very broad commercial practical value. Moreover, the cell provided in this embodiment does not require strong restrictive definitions regarding chip layout, mounting, medium, diaphragm shape, substrate material, etc.

[0025] In a specific embodiment, a Wheatstone bridge 5 is mounted on the silicon substrate 1, and the signal processing chip 3 is connected to the output terminal of the Wheatstone bridge 5. The symmetrical resistance of the Wheatstone bridge 5 is 100Ω to 1000Ω. Furthermore, the material of the micro electromechanical 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 and high-purity single-crystal silicon of a single Wheatstone bridge 5. The symmetrical resistance value of the Wheatstone bridge 5 can be achieved by an ion implantation method ranging from 100 ohms to 10,000 ohms. The ends of the output of the Wheatstone bridge 5 can be compensated for temperature drift, which causes changes in the internal resistance of the Wheatstone bridge output due to temperature changes, by methods such as temperature compensation. Of course, in other embodiments, the cell may be realized with pole pieces that fabricate capacitors in a single silicon material, which results in higher noise due to the effect of temperature on the linearity of the pressure output. Furthermore, the material of the micro-electromechanical sensor 2 in this embodiment is single-crystal silicon. The fabricated circuit is designed and manufactured as a prototype sample using the resistance of the Wheatstone bridge 5 without temperature drift as an example, and temperature and pressure measurements are evaluated 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. Furthermore, the conversion range of the analog-to-digital converter is 10 bits to 32 bits. In addition, the signal processing chip 3 is equipped with one or more standard communication protocols, and the standard communication protocol is the IIC protocol, SPI protocol, or TTL protocol.

[0028] This embodiment adds a 24-bit analog-to-digital converter to the output terminal of the Wheatstone bridge 5. From a scientific and technical standpoint, this converter can, in principle, be applied to any number of bits from 10 to 32. The converter may be written to once, a finite number of times, or an infinite number of times (theoretical value, i.e., multiple writing methods). The converter is equipped with one or more standard communication protocols, such as a 2-wire IIC protocol, a 3-wire SPI protocol, or a single-wire TTL protocol. In specific usage scenarios, this embodiment uses the 2-wire IIC protocol and the 3-wire SPI protocol as standalone output methods to create samples. Naturally, this does not mean that other data transmission methods are not within the scope of application of this embodiment.

[0029] Furthermore, the connection method between the micro electromechanical sensor 2 and the signal processing chip 3 may be a method using pure gold, alloy, copper wire, aluminum wire, silver wire, etc., or an electrical connection method may be realized using novel flip-chip technology by mounting balls on the chip. This embodiment provides a method for measuring pressure and temperature inside a cell and a feasible logic, which has innovative aspects in many respects, such as materials, signal acquisition, operational amplifiers, noise processing, temperature rejection, linear compensation, chemical reaction compatibility, and packaging method, and has advantages such as low cost, high accuracy, fast response, and the ability to create a secondary package that can be adapted according to material compatibility and user structure.

[0030] Furthermore, the micro-electromechanical sensor 2 and / or signal processing chip 3 are embedded in the silicon substrate 1 using an automated laser welding method or a piezoresistive embedding welding method.

[0031] Conventional measurement methods involve physical safety air vents and externally attached, isolated temperature measurement, which have many drawbacks, including a lack of standard mounting conditions, complex external wiring, slow signal response, and cumbersome peripheral digital processing. This embodiment enables mass production of high-strength internally embedded devices using an automated laser welding method or piezoresistive embedding welding, offering a series of advantages such as high reliability, digital real-time capabilities, cost reduction, and chemical compatibility. Furthermore, the chemical compatibility of this embodiment considers the chemical reactions during the charging and discharging processes of the electrolyte as a starting point. In the electrochemical process of lithium ions, the generation of gases and heat release associated with high temperatures are inevitable, and the electrolyte itself exhibits high-strength corrosion characteristics during electrochemistry. This embodiment uses a globally general-purpose cell aluminum as a pressure medium, and the possibility of contact with a hard medium allows for accurate digitalization and high-precision output of the pressure of the mixed gas and liquid inside the cell, thereby improving data detection accuracy and enhancing the safety level of lithium batteries.

[0032] Embodiments of the present invention further provide a lithium battery including a cell to which any of the sensors described above is attached.

[0033] Each embodiment in the specification is described in a gradual manner, and each embodiment mainly describes the differences from other embodiments, with the same or similar parts between embodiments referring to one another. The systems disclosed in the embodiments are simple to describe as they correspond to the methods disclosed in the embodiments, and relevant details should be referred to the description of the method. Furthermore, those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications are also within the scope of protection of the claims of the present application.

[0034] In this specification, relational terms such as "First" and "Second," etc., are used solely to distinguish one entity or operation from another entity or operation, and do not require or suggest that any such actual relationship or order exists between these entities or operations. Furthermore, the terms "include," "incorporate," or any other variation thereof are intended to include non-exclusive inclusion, thereby including not only those elements but also other elements not explicitly listed, or elements specific to such a process, method, article, or device. In less restrictive contexts, the element limited by "includes one..." in a sentence does not preclude the existence of other identical elements in a process, method, article, or device that includes such element.

[0035] (Note) (Note 1) A cell containing an electrolyte and equipped with a sensor, A silicon substrate and A minute electromechanical sensor is installed on the silicon substrate and electrically connected to the silicon substrate, A signal processing chip is installed on the silicon substrate and located on the side of the micro-electromechanical sensor, and is electrically connected to the silicon substrate and the micro-electromechanical sensor, wherein a Wheatstone bridge is attached to the silicon substrate, and the signal processing chip is connected to the output terminal of the Wheatstone bridge. A stress diaphragm is installed above the aforementioned micro-electromechanical sensor, with one side in contact with the micro-electromechanical sensor and the other side in contact with the electrolyte in the cell, for detecting temperature and / or pressure data inside the cell, wherein the stress diaphragm is made of aluminum, and the stress diaphragm is made of aluminum. The aforementioned micro-electromechanical sensor and / or signal processing chip is embedded in the silicon substrate using an automated laser welding method or a piezoresistive embedding welding method. A cell with a sensor attached.

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

[0037] (Note 3) The aforementioned signal processing chip is an analog-to-digital converter. A cell to which the sensor described in Appendix 1 is attached.

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

[0039] (Note 5) The signal processing chip includes one or more standard communication protocols, the standard communication protocol being the IIC protocol, SPI protocol, or TTL protocol. A cell to which the sensor described in Appendix 1 is attached.

[0040] (Note 6) The material of the aforementioned micro-electromechanical sensor is single-crystal silicon. A cell to which the sensor described in Appendix 1 is attached.

[0041] (Note 7) A silicon substrate and A minute electromechanical sensor is installed on the silicon substrate and electrically connected to the silicon substrate, A signal processing chip is installed on the silicon substrate and located on the side of the micro-electromechanical sensor, and is electrically connected to the silicon substrate and the micro-electromechanical sensor, wherein a Wheatstone bridge is attached to the silicon substrate, and the signal processing chip is connected to the output terminal of the Wheatstone bridge. A stress diaphragm is installed above the aforementioned micro-electromechanical sensor, with one side in contact with the micro-electromechanical sensor and the other side in contact with the electrolyte in the cell, for detecting temperature and / or pressure data inside the cell, wherein the stress diaphragm is made of aluminum, and the stress diaphragm is made of aluminum. The aforementioned micro-electromechanical sensor and / or signal processing chip is embedded in the silicon substrate using an automated laser welding method or a piezoresistive embedding welding method. Lithium battery.

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

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

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

[0045] (Note 11) The signal processing chip includes one or more standard communication protocols, the standard communication protocol being the IIC protocol, SPI protocol, or TTL protocol. Lithium battery as described in Appendix 7.

[0046] (Note 12) The material of the aforementioned micro-electromechanical sensor is single-crystal silicon. Lithium battery as described in Appendix 7.

Claims

1. A cell containing an electrolyte and equipped with a sensor, A silicon substrate and A miniature electromechanical sensor is installed on the silicon substrate and electrically connected to the silicon substrate by flip-chip technology, A signal processing chip installed on the silicon substrate and located on the side of the micro-electromechanical sensor, electrically connected to the silicon substrate and the micro-electromechanical sensor by the flip-chip technology, wherein a Wheatstone bridge is attached to the silicon substrate, and the signal processing chip is connected to the output terminal of the Wheatstone bridge by the flip-chip technology, A stress diaphragm is installed above the aforementioned micro-electromechanical sensor, with one side in contact with the micro-electromechanical sensor and the other side in contact with the electrolyte in the cell, for detecting temperature and / or pressure data inside the cell, wherein the stress diaphragm is made of aluminum, and the stress diaphragm is made of aluminum. The aforementioned micro-electromechanical sensor and / or signal processing chip is embedded in the silicon substrate using an automated laser welding method or a piezoresistive embedding welding method. A cell with a sensor attached.

2. The symmetrical resistance of the Wheatstone bridge is between 100Ω and 1000Ω. A cell to which the sensor described in claim 1 is attached.

3. The aforementioned signal processing chip is an analog-to-digital converter. A cell to which the sensor described in claim 1 is attached.

4. The conversion range of the aforementioned analog-to-digital converter is 10 bits to 32 bits. A cell to which the sensor described in claim 3 is attached.

5. The signal processing chip includes one or more standard communication protocols, the standard communication protocol being the IIC protocol, the SPI protocol, or the TTL protocol. A cell to which the sensor described in claim 1 is attached.

6. The material of the aforementioned micro-electromechanical sensor is single-crystal silicon. A cell to which the sensor described in claim 1 is attached.

7. A silicon substrate and A miniature electromechanical sensor is installed on the silicon substrate and electrically connected to the silicon substrate by flip-chip technology, A signal processing chip installed on the silicon substrate and located on the side of the micro-electromechanical sensor, electrically connected to the silicon substrate and the micro-electromechanical sensor by the flip-chip technology, wherein a Wheatstone bridge is attached to the silicon substrate, and the signal processing chip is connected to the output terminal of the Wheatstone bridge by the flip-chip technology, A stress diaphragm is installed above the aforementioned micro-electromechanical sensor, with one side in contact with the micro-electromechanical sensor and the other side in contact with the electrolyte in the cell, for detecting temperature and / or pressure data inside the cell, wherein the stress diaphragm is made of aluminum, and the stress diaphragm is made of aluminum. The aforementioned micro-electromechanical sensor and / or signal processing chip is embedded in the silicon substrate using an automated laser welding method or a piezoresistive embedding welding method. Lithium battery.

8. The symmetrical resistance of the Wheatstone bridge is between 100Ω and 1000Ω. The lithium battery according to claim 7.

9. The aforementioned signal processing chip is an analog-to-digital converter. The lithium battery according to claim 7.

10. The conversion range of the aforementioned analog-to-digital converter is 10 bits to 32 bits. The lithium battery according to claim 9.

11. The signal processing chip includes one or more standard communication protocols, the standard communication protocol being the IIC protocol, the SPI protocol, or the TTL protocol. The lithium battery according to claim 7.

12. The material of the aforementioned micro-electromechanical sensor is single-crystal silicon. The lithium battery according to claim 7.

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