CN113608139A - Temperature monitoring method and manufacturing method of lithium ion battery - Google Patents
Temperature monitoring method and manufacturing method of lithium ion battery Download PDFInfo
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- CN113608139A CN113608139A CN202110886249.7A CN202110886249A CN113608139A CN 113608139 A CN113608139 A CN 113608139A CN 202110886249 A CN202110886249 A CN 202110886249A CN 113608139 A CN113608139 A CN 113608139A
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- battery
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- ion battery
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- 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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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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
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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
- 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
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- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Materials Engineering (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a lithium ion battery temperature monitoring method, which comprises the following steps: and testing the corresponding relation between the viscosity and the temperature of the electrolyte, and establishing a relation curve between the viscosity and the temperature. Monitoring the real-time viscosity of the electrolyte in the lithium ion battery. And comparing the real-time viscosity with the relation curve to obtain the real-time temperature inside the lithium ion battery. In addition, a manufacturing method of the lithium ion battery is also provided. According to the lithium battery temperature monitoring method and the manufacturing method, the internal temperature of the lithium battery is indirectly detected by detecting the viscosity of the electrolyte in real time, the test is accurate, the delay is avoided, the monitoring of the battery state is facilitated, and the potential safety hazard is reduced.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery temperature monitoring method and a manufacturing method.
Background
The lithium ion battery with the unique performance advantages is widely applied to energy storage power systems of hydraulic power, firepower, wind power, solar power stations and the like, uninterrupted power supplies of post and telecommunications communication, and a plurality of fields of electric tools, electric bicycles, electric motorcycles, electric automobiles, military equipment, aerospace and the like.
Because the electrolyte used by the lithium battery is an organic solvent and can be combusted, the risk of combustion and explosion exists when the electrolyte meets extreme conditions or is not used properly, and thermal runaway often occurs before the risk, so that the temperature state of the lithium battery needs to be monitored constantly, the lithium battery is ensured to work in a proper temperature range, and the alarm can be given out at the first time when the temperature is abnormal. Along with the larger the lithium ion battery is, the higher the compaction density is, the heat production capacity of the battery is increased, the heat dissipation performance is reduced, and the safety risk of the lithium ion battery is increased, so that higher requirements are provided for the management of the lithium ion battery, and the monitoring of the temperature state of the lithium ion battery is of great importance.
Disclosure of Invention
Therefore, it is necessary to provide a lithium ion battery temperature monitoring method and a manufacturing method capable of testing the temperature of a lithium battery, aiming at the problem of safety risk caused by thermal runaway of the lithium battery.
A lithium ion battery temperature monitoring method comprises the following steps:
testing the corresponding relation between the viscosity and the temperature of the electrolyte, and establishing a relation curve between the viscosity and the temperature;
monitoring the real-time viscosity of the electrolyte in the lithium ion battery;
and comparing the real-time viscosity with the relation curve to obtain the real-time temperature inside the lithium ion battery.
Further, the step of testing the corresponding relationship between the viscosity and the temperature of the electrolyte and establishing the relationship curve between the viscosity and the temperature comprises the following steps:
the viscosity versus temperature curve was input into the BMS.
Further, the step of monitoring the real-time viscosity of the electrolyte in the lithium ion battery comprises the following steps:
when the lithium ion battery is manufactured, one end of the miniature viscometer is extended into the electrolyte inside the lithium ion battery;
the electrolyte viscosity monitored by the microviscometer was input to the BMS.
A manufacturing method of a lithium ion battery comprises the following steps:
respectively welding a positive electrode lug and a negative electrode lug of the battery cell on a positive electrode end and a negative electrode end of the cover plate;
fixing one end of a micro viscometer on the cover plate and connecting the micro viscometer to the other side of the cover plate;
wrapping the battery cell and the mini-viscometer by using an insulating bag, placing the battery cell and the mini-viscometer into an aluminum shell, and welding a shell cover;
injecting electrolyte into the battery core;
the battery core after liquid injection is manufactured into a battery through the steps of formation, aging, sealing, capacity grading and detection.
Further, before the step of respectively welding the positive tab and the negative tab of the battery cell to the positive end and the negative end of the cover plate, the method further comprises the following steps:
manufacturing a positive plate, a negative plate and a diaphragm into a single pole core in a winding mode;
and connecting a plurality of pole cores in parallel to form a battery core.
Further, the step of wrapping the battery cell and the mini-viscometer by using an insulating bag, placing the battery cell and the mini-viscometer into an aluminum shell and welding a shell cover further comprises the following steps before the step of wrapping the battery cell and the mini-viscometer by using the insulating bag:
and sleeving a thin pipe outside the mini viscometer and fixing the thin pipe on the cover plate.
Further, the step of wrapping the battery cell and the mini-viscometer by using an insulating bag, placing the battery cell and the mini-viscometer into an aluminum shell and welding a shell cover further comprises the following steps before the step of wrapping the battery cell and the mini-viscometer by using the insulating bag:
and the mounting and stopping frame is used for fixing the positive electrode lug and the negative electrode lug.
Further, the step of injecting the electrolyte into the battery cell further comprises the following steps before the step of injecting the electrolyte into the battery cell:
and baking the electric core, and removing moisture in the electric core.
Further, the step of injecting the electrolyte into the battery cell includes the steps of:
annotate liquid to the qualified electric core of moisture, during notes liquid, inside electrolyte got into electric core through annotating the liquid hole, one part of electrolyte was followed the bottom and is soaked fast positive plate, negative pole piece and the diaphragm of electric core, during another part was full of the tubule of installing the miniature viscometer to simultaneously with the gas outgoing in the electric core.
Further, the step of injecting the electrolyte into the battery cell includes the following steps:
and (4) standing the battery cell, and deeply soaking.
According to the lithium battery temperature monitoring method, the internal temperature of the lithium battery is indirectly detected by detecting the viscosity of the electrolyte in real time, the test is accurate, the delay is avoided, the monitoring of the battery state is facilitated, and the potential safety hazard is reduced.
The miniature viscometer has small volume, does not generate negative influence on the design of a lithium battery pole core, does not need to sacrifice partial performance, and can also monitor the residual condition of electrolyte in the battery, thereby early warning the life attenuation of the lithium battery caused by insufficient electrolyte in advance and ensuring the use safety of the battery.
Drawings
FIG. 1 is a flow diagram of a method for monitoring the temperature of a lithium ion battery according to an embodiment;
FIG. 2 is a graph showing the relationship between the viscosity of the electrolyte and the temperature;
FIG. 3 is a flow chart of a method for fabricating a lithium ion battery according to an embodiment;
fig. 4 is a structural diagram of the lithium ion battery manufactured by the method in fig. 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, in one embodiment, a method for monitoring the temperature of a lithium ion battery includes the following steps:
step S110, testing the corresponding relation between the viscosity and the temperature of the electrolyte, and establishing a relation curve between the viscosity and the temperature. The viscosities and temperatures of different electrolytes all present a one-to-one correspondence relationship, so that the viscosities of the electrolytes used by the lithium ion Battery at different temperatures are tested, a relationship curve of the viscosities and the temperatures is established, and then the relationship curve is stored in a BMS (Battery Management System). Referring to fig. 2, three different electrolyte temperature curves are shown.
And step S120, monitoring the real-time viscosity of the electrolyte in the lithium ion battery. Specifically, during the preparation lithium ion battery, during stretching into the inside electrolyte of lithium ion battery with the one end of miniature viscometer, the other end is connected with the BMS to the electrolyte viscosity input BMS with the monitoring of miniature viscometer.
Step S130, comparing the real-time viscosity with the relationship curve to obtain the real-time temperature inside the lithium ion battery. The battery during operation BMS gives the power supply of miniature viscometer simultaneously, and the viscosity of electrolyte in the miniature viscometer begins the continuous test battery to the viscosity that will test returns BMS and handles, reachs the inside temperature of battery.
According to the lithium battery temperature monitoring method, the internal temperature of the lithium battery is indirectly detected by detecting the viscosity of the electrolyte in real time, the test is accurate, the delay is avoided, the monitoring of the battery state is facilitated, and the potential safety hazard is reduced.
Most of the conventional solutions are to install a temperature sensor on a connection tab, a cover plate or a case of the battery to monitor the temperature of the battery in real time and upload the temperature information to the BMS for processing.
However, the temperature sensor is arranged on the battery connecting sheet, the cover plate or the shell, most of tests are the surface temperature outside the battery, the temperature inside the battery cannot be accurately reflected, the deviation is more, when the temperature inside the battery is higher, the temperature cannot be detected at the first time, certain hysteresis exists, and the phenomenon of the battery with more and thicker cell pole piece layers is more obvious. The problem of difficult heat dissipation generally exists in the electric core that increases electric core size or thick pole piece's electric core, therefore the temperature of battery inside often has great difference with the temperature of battery case or utmost point post. If place temperature sensor inside the pole piece, can destroy the design of lithium cell structure, cause the sacrifice of performance.
The invention can test the temperature in the lithium battery accurately without delay. Simultaneously, the miniature viscometer volume is less, does not produce negative effects to the design of lithium cell utmost point core, also need not sacrifice partial performance to can also monitor the surplus condition of the inside electrolyte of battery, thereby early warning in advance to the life-span decay that the lithium cell caused because of electrolyte is not enough, guarantee the safe in utilization of battery.
In addition, a manufacturing method of the lithium ion battery is also provided.
As shown in fig. 3 and 4, a method for manufacturing a lithium ion battery includes the following steps:
step S310, respectively welding the positive tab and the negative tab of the battery cell to the positive end and the negative end of the cover plate 410. Specifically, in the manufacturing process of the battery, the positive plate, the negative plate and the diaphragm need to be manufactured into a single pole core in a winding mode. Then, a single pole core is used as a cell of the lithium battery, or a plurality of pole cores are connected in parallel to form the lithium battery cell, and then the welding of the pole lugs is carried out.
In step S320, one end of the micro adhesion gauge 420 is fixed on the cover plate 410 and connected to the other side of the cover plate 410. The microviscometer 420 is used to test the viscosity of the electrolyte in the lithium battery. The micro viscometer 420 is fixed to the cover plate 410, and the outside is sleeved with the thin tube and fixed to the cover plate 410 to protect the micro viscometer 410. The mini viscometer 420 is connected to the other side of the cap plate 410 to be wired to transmit the monitored viscosity of the electrolyte to the BMS.
Step S330, the battery cell and the mini viscometer 420 are wrapped by an insulation bag, and the battery cell and the mini viscometer are placed in an aluminum shell 430 and welded with a shell cover. In order to keep the tabs stable, a stop frame 440 is required to be installed to fix the positive and negative tabs before the battery cell and the microviscometer are wrapped with an insulating bag, placed in the aluminum case, and the case cover is welded. And then welding the shell cover. And then, baking the battery cell to remove moisture in the battery cell.
Step S340, injecting an electrolyte into the battery cell. Specifically, annotate liquid to the qualified electric core of moisture, during notes liquid, inside electrolyte got into electric core through annotating the liquid hole, one part of electrolyte was soaked from the bottom fast positive plate, negative pole piece and the diaphragm of electric core, in another part was full of the tubule of installing miniature viscometer 420 to simultaneously with the gas outgoing in the electric core. And after the electrolysis with the set amount is injected, stopping injecting liquid, standing the battery cell, and deeply infiltrating.
And step S350, the battery cell after liquid injection is manufactured into a battery through the steps of formation, aging, sealing, capacity grading and detection.
According to the manufacturing method of the lithium ion battery, the viscosity of the electrolyte can be monitored in real time through the micro viscometer 420, and then the internal temperature of the lithium battery can be monitored. In addition, the volume of the miniature viscosity meter 420 is small, so that the internal structure of the lithium battery cannot be influenced, and the performance of the lithium battery cannot be influenced.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A lithium ion battery temperature monitoring method is characterized by comprising the following steps:
testing the corresponding relation between the viscosity and the temperature of the electrolyte, and establishing a relation curve between the viscosity and the temperature;
monitoring the real-time viscosity of the electrolyte in the lithium ion battery;
and comparing the real-time viscosity with the relation curve to obtain the real-time temperature inside the lithium ion battery.
2. The method for monitoring the temperature of the lithium ion battery according to claim 1, wherein the step of testing the corresponding relationship between the viscosity and the temperature of the electrolyte and establishing the viscosity-temperature relationship curve comprises the following steps:
the viscosity versus temperature curve was input into the BMS.
3. The method according to claim 2, wherein the step of monitoring the real-time viscosity of the electrolyte in the lithium ion battery comprises the steps of:
when the lithium ion battery is manufactured, one end of the miniature viscometer is extended into the electrolyte inside the lithium ion battery;
the electrolyte viscosity monitored by the microviscometer was input to the BMS.
4. A manufacturing method of a lithium ion battery is characterized by comprising the following steps:
respectively welding a positive electrode lug and a negative electrode lug of the battery cell on a positive electrode end and a negative electrode end of the cover plate;
fixing one end of a micro viscometer on the cover plate and connecting the micro viscometer to the other side of the cover plate;
wrapping the battery cell and the mini-viscometer by using an insulating bag, placing the battery cell and the mini-viscometer into an aluminum shell, and welding a shell cover;
injecting electrolyte into the battery core;
the battery core after liquid injection is manufactured into a battery through the steps of formation, aging, sealing, capacity grading and detection.
5. The method for manufacturing a lithium ion battery according to claim 4, wherein the step of welding the positive tab and the negative tab of the battery cell to the positive end and the negative end of the cover plate respectively further comprises the following steps:
manufacturing a positive plate, a negative plate and a diaphragm into a single pole core in a winding mode;
and connecting a plurality of pole cores in parallel to form a battery core.
6. The method for manufacturing the lithium ion battery according to claim 4, wherein the step of wrapping the battery core and the mini-viscometer by using an insulating bag, placing the battery core and the mini-viscometer into an aluminum shell, and welding a shell cover further comprises the following steps before the step of wrapping the battery core and the mini-viscometer by using the insulating bag:
and sleeving a thin pipe outside the mini viscometer and fixing the thin pipe on the cover plate.
7. The method for manufacturing the lithium ion battery according to claim 4, wherein the step of wrapping the battery core and the mini-viscometer by using an insulating bag, placing the battery core and the mini-viscometer into an aluminum shell, and welding a shell cover further comprises the following steps before the step of wrapping the battery core and the mini-viscometer by using the insulating bag:
and the mounting and stopping frame is used for fixing the positive electrode lug and the negative electrode lug.
8. The method for manufacturing the lithium ion battery according to claim 4, wherein the step of injecting the electrolyte into the battery cell further comprises the following steps before:
and baking the electric core, and removing moisture in the electric core.
9. The method for manufacturing the lithium ion battery according to claim 8, wherein the step of injecting the electrolyte into the battery cell comprises the following steps:
annotate liquid to the qualified electric core of moisture, during notes liquid, inside electrolyte got into electric core through annotating the liquid hole, one part of electrolyte was followed the bottom and is soaked fast positive plate, negative pole piece and the diaphragm of electric core, during another part was full of the tubule of installing the miniature viscometer to simultaneously with the gas outgoing in the electric core.
10. The method for manufacturing a lithium ion battery according to claim 8, wherein the step of injecting the electrolyte into the cell comprises the following steps:
and (4) standing the battery cell, and deeply soaking.
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| CN202110886249.7A CN113608139A (en) | 2021-08-03 | 2021-08-03 | Temperature monitoring method and manufacturing method of lithium ion battery |
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