CN116224095A - Sensor for detecting internal pressure and temperature of battery, lithium battery and method - Google Patents
Sensor for detecting internal pressure and temperature of battery, lithium battery and method Download PDFInfo
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- CN116224095A CN116224095A CN202310496885.8A CN202310496885A CN116224095A CN 116224095 A CN116224095 A CN 116224095A CN 202310496885 A CN202310496885 A CN 202310496885A CN 116224095 A CN116224095 A CN 116224095A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 13
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 13
- 239000000758 substrate Substances 0.000 claims abstract description 49
- 239000012530 fluid Substances 0.000 claims abstract description 36
- 239000012528 membrane Substances 0.000 claims abstract description 36
- 238000012545 processing Methods 0.000 claims abstract description 31
- 238000001514 detection method Methods 0.000 claims description 37
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- 229910052782 aluminium Inorganic materials 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 11
- 230000003321 amplification Effects 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 7
- 238000003466 welding Methods 0.000 description 5
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920002545 silicone oil Polymers 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- 206010063385 Intellectualisation Diseases 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical group [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- -1 aluminum-magnesium-zinc-copper Chemical compound 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000001259 photo etching Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Or Calibration Of Command Recording Devices (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a sensor for detecting internal pressure and temperature of a battery, a lithium battery and a method, wherein the sensor comprises the following components: the sensor comprises a sensor substrate and a stress membrane covered above the sensor substrate, a sensor cavity is formed between the sensor substrate and the stress membrane, the sensor cavity comprises a micro-electromechanical sensor chip arranged on the sensor substrate and a signal processing chip connected with the micro-electromechanical sensor chip, and a fluid medium is further added in the sensor cavity. The invention transmits the temperature of the stress membrane and the external pressure to the micro-electromechanical sensor chip through the fluid medium, then the micro-electromechanical sensor chip transmits the sensing data to the signal processing chip, and the signal processing chip processes the sensing data to obtain the pressure data and the temperature data in the battery, thus realizing the effect of detecting the pressure and the temperature in the battery in real time and improving the use safety of the battery.
Description
Technical Field
The invention relates to the technical field of battery sensors, in particular to a sensor for detecting internal pressure and temperature of a battery, a lithium battery and a method.
Background
Along with the development of the intellectualization of the internet of things, the application of the automobile battery is also widely and rapidly promoted, but at the same time, the safety accidents based on the automobile battery are gradually apparent, for example, the automobile battery is lost when the temperature of the automobile battery is too high or the external pressure is too high, and the safety problem of the automobile is further caused.
At present, the solution adopted for monitoring the automobile battery is to monitor the external temperature of the battery core outside the battery core by a contact detection method, then transmit the dynamic output change of the temperature to a BMS control system (commonly called battery carers or battery households, mainly for intelligent management and maintenance of each battery unit, preventing the battery from overcharge and overdischarge, prolonging the service life of the battery and monitoring the state of the battery) by a lead, and then process the battery according to practical application by adopting a logic of series hard transmission, wherein the number of the logic is equal to that of the battery core. However, this method has certain drawbacks, such as complicated external wiring and monitored temperature being only the external temperature of the battery, but not the actual data inside the battery cell, which may have a monitoring error, and the method cannot effectively and truly monitor the electrochemical process inside the battery cell.
Disclosure of Invention
The embodiment of the invention provides a sensor for detecting the internal pressure and temperature of a battery, a lithium battery and a detection method, and aims to detect the internal pressure and temperature of the battery in real time and improve the use safety of the battery.
The embodiment of the invention provides a sensor for detecting the internal pressure and temperature of a battery, which comprises the following components: the sensor comprises a sensor substrate and a stress membrane covered above the sensor substrate, a sensor cavity is formed between the sensor substrate and the stress membrane, the sensor cavity comprises a micro-electromechanical sensor chip arranged on the sensor substrate and a signal processing chip connected with the micro-electromechanical sensor chip, and a fluid medium for conducting the pressure and the temperature of the stress membrane is further added in the sensor cavity.
Further, the stress diaphragm comprises an annular contact part connected with the sensor substrate and a protruding part forming the sensor cavity with the sensor substrate, wherein the protruding part is arranged in the middle of the annular contact part, and the protruding part and the annular contact part are combined to form a hat shape.
Further, the annular contact portion of the stress membrane is laser welded to the sensor substrate.
Further, a fluid channel for injecting a fluid medium is formed in the sensor substrate.
Further, the fluid channel comprises a through hole formed in the sensor substrate and a sealing member for sealing the through hole after the fluid medium is injected.
Further, the sealing element is an aluminum ball matched with the through hole.
Furthermore, the sensor substrate and the stress membrane are made of aluminum materials.
Further, the fluid medium is a filling oil.
The embodiment of the invention also provides a lithium battery, which adopts the sensor for detecting the internal pressure and the temperature of the battery.
The embodiment of the invention also provides a method for detecting the internal pressure and the temperature of the lithium battery, which is suitable for the sensor for detecting the internal pressure and the temperature of the battery, and comprises the following steps:
the micro-electromechanical sensor chip is utilized to detect the pressure of the stress membrane through a fluid medium, and a pressure detection signal is transmitted to the signal processing chip;
the micro-electromechanical sensor chip is utilized to detect the temperature of the stress membrane through a fluid medium, and a temperature detection signal is transmitted to the signal processing chip;
the temperature detection signal and the pressure detection signal are subjected to signal amplification processing through a signal processing chip;
carrying out Gaussian filtering treatment on the temperature detection signal and the pressure detection signal after the signal amplification treatment;
performing analog-to-digital conversion on the temperature detection signal and the pressure detection signal based on the Gaussian filter processing result;
the result of the analog-to-digital conversion is corrected by the register, and the corrected result is output as the result of the pressure and temperature detection inside the battery.
The embodiment of the invention provides a sensor for detecting the internal pressure and temperature of a battery, a lithium battery and a detection method, wherein the sensor comprises the following components: the sensor comprises a sensor substrate and a stress membrane covered above the sensor substrate, a sensor cavity is formed between the sensor substrate and the stress membrane, the sensor cavity comprises a micro-electromechanical sensor chip arranged on the sensor substrate and a signal processing chip connected with the micro-electromechanical sensor chip, and a fluid medium for conducting the pressure and the temperature of the stress membrane is further added in the sensor cavity. According to the embodiment of the invention, the temperature of the stress membrane and the external pressure are conducted to the micro-electromechanical sensor chip through the fluid medium, then the micro-electromechanical sensor chip transmits sensing data to the signal processing chip, and the signal processing chip processes the sensing data to obtain pressure data and temperature data in the battery, so that the effects of detecting the pressure and the temperature in the battery in real time can be realized, and whether corresponding safety measures need to be adopted or not can be judged based on the pressure detection result and the temperature detection, so that the use safety of the battery is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a sensor for detecting internal pressure and temperature of a battery according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a sensor for detecting internal pressure and temperature of a battery according to an embodiment of the present invention;
FIG. 3 is a schematic view of another angle of a sensor for detecting internal pressure and temperature of a battery according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of a method for detecting internal pressure and temperature of a lithium battery according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring now to fig. 1 and 2, an embodiment of the present invention provides a sensor for detecting internal pressure and temperature of a battery, comprising: the sensor comprises a sensor substrate 1 and a stress membrane 2 covered above the sensor substrate 1, a sensor cavity 3 is formed between the sensor substrate 1 and the stress membrane 2, the sensor cavity 3 comprises a micro-electromechanical sensor chip 4 arranged on the sensor substrate 1 and a signal processing chip 5 connected with the micro-electromechanical sensor chip 4, and a fluid medium for conducting the pressure and the temperature of the stress membrane 2 is further added into the sensor cavity 3.
In this embodiment, the sensor specifically includes a sensor substrate 1 and a stress diaphragm 2, where a micro-electro-mechanical sensor chip 4 and a signal processing chip 5 are disposed on the sensor substrate 1, and a sensor cavity 3 is formed between the sensor substrate 1 and the stress diaphragm 2, and is used for filling a fluid medium, where the fluid medium can conduct the temperature and the pressure of the stress diaphragm 2 to the micro-electro-mechanical sensor chip 4, and the micro-electro-mechanical sensor chip 4 outputs a corresponding temperature detection signal and a corresponding pressure detection signal based on the conducted temperature and pressure, and then the signal processing chip 5 connected to the micro-electro-mechanical sensor chip 4 performs signal processing, so as to obtain corresponding pressure data and temperature data.
According to the embodiment, the temperature of the stress membrane 2 and the external pressure are conducted to the micro-electromechanical sensor chip 4 through the fluid medium, then the micro-electromechanical sensor chip 4 transmits sensing data to the signal processing chip 5, and the signal processing chip 5 processes the sensing data to obtain pressure data and temperature data inside the battery, so that the effects of detecting the pressure and the temperature in real time inside the battery can be achieved, and accordingly whether corresponding safety measures need to be adopted or not can be judged based on the pressure detection result and the temperature detection, and the use safety of the battery is improved.
In an embodiment, referring to fig. 3, the stress membrane 2 includes an annular contact portion 21 connected to the sensor substrate 1 and a protrusion portion 22 forming the sensor cavity 3 with the sensor substrate 1, wherein the protrusion portion 22 is disposed in the middle of the annular contact portion 21, and the protrusion portion 22 is combined with the annular contact portion 21 to form a hat shape.
The pressure strain film of the embodiment adopts a hat shape formed by pre-stamping, the surface is designed to be flat, then the stress concentration surface on the plane is designed and innovated in a force migration mode, the stress points are properly migrated to the inner position from the periphery of the original plane through a photoetching process, and then the pressure induction is controlled to be in a linear range, so that the surface of the pressure strain film is not corroded by material chemistry, and meanwhile, the measured liquid pressure in the battery cell can be fully and linearly transferred out in real time.
Further, the annular contact portion 21 of the stress membrane 2 is laser welded to the sensor substrate 1.
In addition, the materials of the sensor substrate 1 and the stress diaphragm 2 are all aluminum materials.
In this embodiment, the sensor substrate 1 is made of aluminum material, and the stress membrane 2 is also made of aluminum material, and the stress membrane 2 and the sensor substrate 1 are assembled and sealed by welding or bonding, so as to avoid leakage of the filled liquid medium. The compatibility of electrochemical processes with electrolyte is adopted from the material of the embodiment, and particularly, a battery cell manufactured by lithium iron phosphate is completely not corroded by electrochemical reactions.
The sensor substrate 1 and the stress membrane 2 in the embodiment are made of similar aluminum materials, and pressure temperature signals in the chip are transmitted, processed and controlled by combining the technology of an aluminum electronic circuit board with the mounting and lead wires of a semiconductor, so that the sensor substrate has the pressure reliability in the pressure range used according to the application and the output linearity without losing pressure. In addition, in this embodiment, a gap design for assembling with the periphery of the stress membrane 2 (i.e., the annular contact portion 21) is left around the sensor substrate 1, laser welding is performed from top to bottom in a welding manner, the volume shape required by welding fusion materials is reserved, and then the characteristics of high fusion depth and narrow fusion width of laser are utilized, so that the welding reliability is ensured, and meanwhile, a wider space is provided for the sensor in this embodiment, so that this embodiment is suitable for mass automatic production, and the problem that the assembly with the battery core cannot be performed due to insufficient space is avoided, namely, the product provided in this embodiment is ensured to have the characteristics of small size, wide applicability, high batch property, high reliability and the like.
It should be further noted that, in this embodiment, by adopting the embedded manner, the aluminum strain film with linear mechanics is used as the stress membrane 2 of the sensor, so that the effect of transmitting the signal about temperature from the top to the bottom of the sensor in real time can be achieved, and the effect of transmitting the signal about pressure to the periphery through the center of the top of the aluminum strain film can be achieved, and meanwhile, the stress intercept line designed inwards at the edge of the stress membrane 2 can enable the stress intercept line to have a larger elastic up-down deformation activity space in the center sensing area of the stress membrane 2 in the process of changing the pressure applied to the top, so that the sensor has the sufficient pressure transmission characteristics.
In a specific embodiment, the aluminum series selected by the aluminum sensor substrate 1 and the stress diaphragm 2 is any one of 3, 5 and 7 series, and of course, in an actual production application scenario, the aluminum series can be selected to keep consistency with the series used for assembling the rear end of the product, so that the aluminum series can be ensured to be consistent with the compatibility of the material of the product, and of course, in other embodiments, other aluminum series can also be adopted. Wherein 3 is the manganese element as main component, the content of which is 1.0-1.5, which is used in industry and products with high rust protection requirement; the system 5 belongs to a series of alloy aluminum plates which are more commonly used, and the main element is magnesium, and has the main characteristics of low density, high tensile strength, high elongation and good fatigue strength, but can not be used for heat treatment reinforcement, and the application in the conventional industry is wider; the 7 series belongs to aviation series, is aluminum-magnesium-zinc-copper alloy, is heat-treatable alloy, belongs to super-hard aluminum alloy, has good wear resistance and good weldability, but has poor corrosion resistance.
In one embodiment, the sensor substrate 1 is provided with a fluid channel 6 for injecting a fluid medium.
Further, the fluid channel 6 includes a through hole formed in the sensor substrate 1, and a sealing member for sealing the through hole after the injection of the fluid medium.
Still further, the sealing member is an aluminum ball adapted to the through hole.
In this embodiment, fluid channels 6 are provided on both front and back surfaces of the aluminum sensor substrate 1 to inject a fluid medium into the sensor cavity 3. The fluid channel 6 may be a through hole or an air vent formed on the sensor substrate 1, and the through hole is sealed by the sealing member after the fluid medium is injected, and the sealing member may be an aluminum ball, however, in other embodiments, other sealing members may be used as long as the sealing effect is achieved and the sealing member is not corroded by the fluid medium.
In a specific embodiment, the fluid medium is a extender oil.
When the measured pressure or temperature is pressed on the aluminum film (namely the aluminum stress membrane 2), the aluminum film transmits the pressure and temperature to the second medium layer from the top to the inner cavity direction: filling with oil. In principle, the filling oil can be food oil, silicone oil or non-silicone oil, and the oil is selected from the characteristics of high density, strong fluidity, wide temperature resistance and the like, and the embodiment uses the oil with the density of 50-500CPS viscosity as a selection specimen.
The embodiment of the invention also provides a lithium battery, which adopts the sensor for detecting the internal pressure and the temperature of the battery.
Fig. 4 is a schematic diagram of a method for detecting internal pressure and temperature of a lithium battery according to an embodiment of the present invention, which is applicable to a sensor for detecting internal pressure and temperature of a battery according to any one of the above embodiments, and specifically includes: steps S401 to S406.
S401, performing pressure detection on the stress membrane 2 through a fluid medium by utilizing the micro-electromechanical sensor chip 4, and transmitting a pressure detection signal to the signal processing chip 5;
s402, detecting the temperature of the stress membrane 2 through a fluid medium by utilizing the micro-electromechanical sensor chip 4, and transmitting a temperature detection signal to the signal processing chip 5;
s403, performing signal amplification processing on the temperature detection signal and the pressure detection signal through a signal processing chip 5;
s404, performing Gaussian filtering processing on the temperature detection signal and the pressure detection signal after signal amplification processing;
s405, carrying out analog-to-digital conversion on the temperature detection signal and the pressure detection signal based on Gaussian filter processing results;
s406, correcting the analog-to-digital conversion result through a register, and outputting the correction result as a pressure and temperature detection result inside the battery.
Since the embodiments of the method portion correspond to the embodiments of the apparatus portion, the embodiments of the method portion are described with reference to the embodiments of the apparatus portion, which are not repeated herein.
In the description, each embodiment is described in a progressive manner, and each embodiment is mainly described by the differences from other embodiments, so that the same similar parts among the embodiments are mutually referred. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A sensor for detecting the internal pressure and temperature of a battery, comprising: the sensor comprises a sensor substrate and a stress membrane covered above the sensor substrate, a sensor cavity is formed between the sensor substrate and the stress membrane, the sensor cavity comprises a micro-electromechanical sensor chip arranged on the sensor substrate and a signal processing chip connected with the micro-electromechanical sensor chip, and a fluid medium for conducting the pressure and the temperature of the stress membrane is further added in the sensor cavity.
2. The sensor for detecting the internal pressure and temperature of a battery according to claim 1, wherein the stress diaphragm includes an annular contact portion connected to the sensor substrate and a protruding portion forming the sensor cavity with the sensor substrate, the protruding portion being provided in the middle of the annular contact portion, the protruding portion being formed in a hat shape in combination with the annular contact portion.
3. The sensor for detecting the internal pressure and temperature of a battery according to claim 2, wherein the annular contact portion of the stress diaphragm is laser welded to the sensor substrate.
4. The sensor for detecting the internal pressure and temperature of a battery according to claim 1, wherein the sensor substrate is provided with a fluid passage for injecting a fluid medium.
5. The sensor for detecting the internal pressure and temperature of a battery according to claim 4, wherein the fluid passage includes a through hole opened on the sensor substrate and a sealing member for sealing the through hole after the injection of the fluid medium.
6. The sensor for detecting the internal pressure and temperature of a battery according to claim 5, wherein the sealing member is an aluminum ball fitted to the through hole.
7. The sensor for detecting the internal pressure and temperature of a battery according to claim 1, wherein the sensor substrate and the stress membrane are made of aluminum materials.
8. The sensor for detecting the internal pressure and temperature of a battery according to claim 1, wherein the fluid medium is a filling oil.
9. A lithium battery characterized in that the sensor for detecting the internal pressure and temperature of the battery according to any one of claims 1 to 8 is employed.
10. A method for detecting internal pressure and temperature of a lithium battery, which is suitable for the sensor for detecting internal pressure and temperature of a battery according to any one of claims 1 to 8, and is characterized by comprising:
the micro-electromechanical sensor chip is utilized to detect the pressure of the stress membrane through a fluid medium, and a pressure detection signal is transmitted to the signal processing chip;
the micro-electromechanical sensor chip is utilized to detect the temperature of the stress membrane through a fluid medium, and a temperature detection signal is transmitted to the signal processing chip;
the temperature detection signal and the pressure detection signal are subjected to signal amplification processing through a signal processing chip;
carrying out Gaussian filtering treatment on the temperature detection signal and the pressure detection signal after the signal amplification treatment;
performing analog-to-digital conversion on the temperature detection signal and the pressure detection signal based on the Gaussian filter processing result;
the result of the analog-to-digital conversion is corrected by the register, and the corrected result is output as the result of the pressure and temperature detection inside the battery.
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| CN202310496885.8A CN116224095A (en) | 2023-05-05 | 2023-05-05 | Sensor for detecting internal pressure and temperature of battery, lithium battery and method |
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| CN202310496885.8A CN116224095A (en) | 2023-05-05 | 2023-05-05 | Sensor for detecting internal pressure and temperature of battery, lithium battery and method |
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