CN111628210A - Lithium ion battery supporting in-situ measurement of internal temperature of battery and manufacturing method - Google Patents
Lithium ion battery supporting in-situ measurement of internal temperature of battery and manufacturing method Download PDFInfo
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- CN111628210A CN111628210A CN202010324183.8A CN202010324183A CN111628210A CN 111628210 A CN111628210 A CN 111628210A CN 202010324183 A CN202010324183 A CN 202010324183A CN 111628210 A CN111628210 A CN 111628210A
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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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
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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
- 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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Abstract
The invention relates to a lithium ion battery supporting in-situ measurement of the internal temperature of the battery and a manufacturing method thereof, wherein the in-situ measurement of the internal temperature of the battery is realized through a thermocouple probe pre-embedded on a battery pole piece, the high-precision dynamic measurement of the internal temperature change of the battery can be accurately carried out in the using process of the battery, the problem of inherent temperature measurement errors which are difficult to avoid in the prior art is solved, and the lithium ion battery has a remarkable effect on improving the operation safety of the battery; meanwhile, the manufacturing method is simple and easy to implement.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a lithium ion battery supporting in-situ measurement of the internal temperature of the battery and a manufacturing method thereof.
Background
At present, the main power source of the automobile industry still remains fossil fuel, most of the discharged volatile organic compounds and greenhouse gases are volatile organic compounds, the pollution problem caused by the huge load of the traffic industry is also aggravated year by year, and great challenges are caused to the human health and the environment. Moreover, with the continuous development of social economy and industrial technology level, other various industrial emission pollution causes continuous deterioration of natural environment, and fossil fuel resources are continuously reduced, so that the problems of energy shortage and environmental deterioration faced by human beings are increasingly difficult.
At present, the world mainly adopts two measures for the phenomena of fossil energy shortage, pollution and the like: the first is to change the energy dependence mode, and the gradual completion is from relying on fossil energy to relying on sustainable development energy, and the second is to change the transportation trade power driving mode, changes from using the internal-combustion engine driven mode of transportation to using electric drive mode of transportation. Among them, Electric vehicles (Electric vehicles) have gradually come into the field of vision of people in recent years due to their remarkable advantages of low energy consumption and low emission. Meanwhile, the emission standards of various countries for fuel vehicles become stricter, some countries have proposed a agenda for eliminating the traditional fuel vehicles, and under the situation, research on the electric vehicle technology is carried out continuously by various parties. The three-battery technology is a core technology for electric vehicle development, wherein a power battery system is also a hot spot of research in various countries as an energy storage device of an electric vehicle. At present, the electric automobile still has a big gap with the traditional automobile in the aspects of power performance, endurance performance and safety performance, and the power battery is of great significance in the aspects of high capacity, high power, high reliability and the like in the future.
The temperature of the battery can obviously affect each performance index of the battery system, and the electrochemical process carried out inside can obviously affect the change of the system temperature in the working process, thereby having important influence on the indexes such as the output power, the efficiency, the service life and the like of the battery and the safety performance. The battery can face the risk of thermal runaway under the condition of high temperature, and meanwhile, the charge and discharge performance can be obviously reduced under the condition of low temperature, so that the monitoring of the temperature of the battery is particularly important.
At present, most of battery systems adopt a mode of sticking a thermocouple on the surface of a battery shell, although the temperature measurement method is convenient and low in cost, the external measured temperature cannot completely reflect a transient temperature field inside the battery, inherent temperature measurement errors exist, the errors can directly influence the judgment of a user on the safety state of the battery, and serious consequences such as explosion caused by thermal runaway of the battery can be caused. In the field of not only electric vehicles but also digital devices, etc., it is necessary to measure the temperature of a battery quickly and accurately when the battery is required. Therefore, there is a need in the industry for a method for in-situ measurement of the internal temperature of a battery with both rapidity and accuracy.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a lithium ion battery supporting in-situ measurement of the internal temperature of the battery and a manufacturing method thereof.
In order to achieve the above purpose, the technical scheme adopted by the invention comprises the following steps:
the lithium ion battery is characterized by comprising at least one thermocouple probe pole piece, wherein the thermocouple probe pole piece is a positive pole piece or a negative pole piece embedded with at least one thermocouple probe.
Further, the thermocouple probe is a T-type thermocouple or a K-type thermocouple with the wire diameter smaller than 100 microns, and the thickness of the pole piece is larger than or equal to 100 microns.
Furthermore, a thermocouple probe is embedded in the geometric center of the pole piece.
Furthermore, more than two thermocouple probes are embedded in the pole piece of the thermocouple probe, and the thermocouple probes with more than two numbers are embedded in the pole piece symmetrically by the geometric center of the pole piece.
Further, a thermocouple terminal corresponding to the thermocouple probe serves as a measurement terminal for connection to a battery thermal management system, and/or the measurement terminal is connected to an external data acquisition instrument.
A manufacturing method of a lithium ion battery supporting in-situ measurement of the internal temperature of the battery is characterized by comprising the following steps of:
fixing a thermocouple probe on a current collector, coating electrode slurry on the current collector fixed with the thermocouple probe, and drying and molding the electrode slurry and the thermocouple probe together;
or, coating electrode slurry on the current collector, inserting a fixed thermocouple probe before drying the electrode slurry, and drying and molding the electrode slurry and the thermocouple probe together.
Further, when the thickness of the pole piece is 100-120 microns, fixing a thermocouple probe on a current collector, coating electrode slurry on the current collector fixed with the thermocouple probe, and drying and molding the electrode slurry and the thermocouple probe together to prepare an embedded thermocouple probe pole piece; when the thickness of the pole piece is more than 120 microns, the embedded thermocouple probe pole piece is prepared by a method of coating electrode slurry on a current collector, inserting a fixed thermocouple probe before drying the electrode slurry, and drying and molding the electrode slurry and the thermocouple probe together.
Further, fixing a thermocouple probe on the current collector corresponding to the geometric center of the pole piece, coating the electrode slurry on the current collector fixed with the thermocouple probe, and drying and molding the electrode slurry and the thermocouple probe together;
or, coating electrode slurry on the current collector, inserting and fixing a thermocouple probe in the geometric center position of the corresponding pole piece before the electrode slurry is dried, and drying and molding the electrode slurry and the thermocouple probe together.
Further, the method also comprises the steps of fixing more than two thermocouple probes on the current collector corresponding to the specific position of the pole piece, coating electrode slurry on the current collector fixed with the thermocouple probes, and drying and molding the electrode slurry and the thermocouple probes together;
or, coating electrode slurry on the current collector, inserting and fixing more than two thermocouple probes at specific positions corresponding to the pole pieces before drying the electrode slurry, and drying and molding the electrode slurry and the thermocouple probes together.
And further, assembling the prepared pre-embedded thermocouple probe pole piece according to a normal lithium ion battery production process.
The invention has the beneficial effects that:
at present, the temperature acquisition of a battery system generally adopts a mode of pasting a thermocouple on the surface of a battery shell, although the method is simple, the dynamic response of external measurement is slow, and the real temperature condition of the battery cannot be reflected. By adopting the lithium ion battery supporting in-situ measurement of the internal temperature of the battery, the in-situ measurement of the internal temperature of the battery is realized through the thermocouple probe pre-embedded on the battery pole piece, the thermocouple probe pole piece is constructed, only the thermocouple probe is pre-embedded, the thermocouple terminal, namely the measurement terminal, is led out, the signal of the thermocouple can be directly detected through an external data acquisition instrument, and the internal temperature and the change rate of the battery can be accurately and rapidly dynamically measured in a high-precision manner in the use process of the battery, so that the internal safety state of the battery is monitored, the problem of inherent temperature measurement error which is difficult to avoid in the prior art is solved, serious consequences such as thermal runaway explosion of the battery are avoided, and the lithium ion battery. The invention also relates to a lithium ion battery manufacturing method supporting in-situ measurement of the internal temperature of the battery, the lithium ion battery supporting in-situ measurement can be prepared only by adding the step of embedding the thermocouple probe in the battery pole piece on the basis of the existing lithium ion battery manufacturing method, and the method is simple and easy to implement; meanwhile, the number of the embedded thermocouple probes can be selected according to actual needs.
Drawings
FIG. 1 is a schematic diagram of a pre-buried thermocouple probe pole piece according to the present invention.
Fig. 2 is a schematic diagram of an embodiment of the lithium ion battery supporting in-situ measurement of the internal temperature of the battery according to the present invention.
Description of the figure numbering: 1-thermocouple probe pole piece, 11-positive pole piece, 12-negative pole piece, 2-thermocouple probe, 21-measuring terminal, 3-diaphragm, 41-aluminum foil and 42-copper foil.
Detailed Description
For a clearer understanding of the contents of the present invention, reference will be made to the accompanying drawings and examples.
The invention relates to a lithium ion battery supporting in-situ measurement of the internal temperature of the battery, which comprises at least one thermocouple probe pole piece, wherein the thermocouple probe pole piece is a positive pole piece or a negative pole piece embedded with at least one thermocouple probe. Fig. 1 is a schematic diagram of a pole piece of an embedded thermocouple probe according to the present invention, which includes a pole piece 1 of the thermocouple probe and a thermocouple probe 2 embedded in the pole piece 1 of the thermocouple probe, where the thermocouple includes a thermocouple probe and a thermocouple terminal, or a probe (i.e., a working end) and a free end (i.e., a measurement end), the invention only embeds the thermocouple probe in the pole piece, the thermocouple terminal is not embedded but outside the pole piece, and the thermocouple terminal is used as a measurement terminal 21 to connect to a battery thermal management system, and/or the measurement terminal 21 of the thermocouple probe 2 is connected to an external data acquisition instrument. The thermocouple probe 2 (working end) contacts with the area of the temperature to be measured, and the measuring terminal 21 is connected to corresponding data acquisition equipment to read the thermoelectric force, and the temperature of the measuring point is obtained through calculation.
Because the thermocouple probe 2 needs to be embedded, the thickness of the thermocouple probe pole piece 1 is preferably more than or equal to 100 micrometers, and meanwhile, the thermocouple probe 2 adopts a T-type thermocouple or a K-type thermocouple with the wire diameter less than 100 micrometers so as to reduce the influence of the thermocouple probe 2 on the normal work of the thermocouple probe pole piece 1 as much as possible. According to the actual requirement of battery temperature measurement, one or more thermocouple probe pole pieces 1 can be selected to embed the thermocouple probe 2 in one battery, and one or more thermocouple probes 2 can be selected to be embedded in each thermocouple probe pole piece 1. When a thermocouple probe 2 is pre-embedded on a single thermocouple probe pole piece 1, preferably, the thermocouple probe 2 is pre-embedded at the geometric center position of the thermocouple probe pole piece 1; when more than two thermocouple probes 2 are embedded in a single thermocouple probe pole piece 1, the thermocouple probes 2 are preferably embedded in the thermocouple probe pole piece 1 symmetrically with respect to the geometric center of the thermocouple probe pole piece 1, for example, two thermocouple probes 2 are embedded symmetrically with respect to the geometric center of the pole piece, or four thermocouple probes 2 are embedded symmetrically with respect to the geometric center of the pole piece.
As shown in fig. 2, which is a schematic view of an embodiment of the lithium ion battery supporting in-situ measurement of the internal temperature of the battery according to the present invention, the embodiment provides a single-layer soft package battery manufactured in a laboratory, which includes an aluminum foil 41 and a copper foil 42 as current collectors, a positive thermocouple probe pole piece 11, a negative thermocouple probe pole piece 12, and a diaphragm 3 sandwiched between the positive thermocouple probe pole piece 11 and the negative thermocouple probe pole piece 12, in order to implement in-situ measurement of the internal temperature of the battery, in the embodiment, a thermocouple probe 2 is embedded in each of the positive thermocouple probe pole piece 11 and the negative thermocouple probe pole piece 12, and the thermocouple terminal corresponding to the thermocouple probe 2 is used as a measurement terminal 21 to connect to a battery thermal management system to implement in-situ measurement of the internal temperature of the battery. For the actually used batteries, most of the batteries are of a multilayer structure, but the basic principle is completely consistent with that described in the embodiment, and the thermocouple probe 2 can be embedded in the positive thermocouple probe pole piece 11 and/or the negative thermocouple probe pole piece 12 of any layer according to the requirement.
The invention also relates to a lithium ion battery manufacturing method supporting in-situ measurement of the internal temperature of the battery, which is different from the existing lithium ion battery manufacturing method in that a pre-embedded thermocouple probe pole piece needs to be prepared, namely a thermocouple probe 2 needs to be pre-embedded on a thermocouple probe pole piece 1, and the method specifically comprises the following steps: fixing a thermocouple probe on a current collector, coating electrode slurry on the current collector fixed with the thermocouple probe, and drying and molding the electrode slurry and the thermocouple probe together; or, coating electrode slurry on the current collector, inserting a fixed thermocouple probe before drying the electrode slurry, and drying and molding the electrode slurry and the thermocouple probe together. The process of embedding the thermocouple probe in the pole piece can be correspondingly adjusted according to the thickness of the battery pole piece, and can adopt a mode of fixing the thermocouple probe and then smearing, or a mode of smearing firstly and then inserting the thermocouple probe. The selection of the specific method depends on the thickness of the thermocouple probe pole piece 1 to be manufactured, and preferably, when the thickness of the thermocouple probe pole piece 1 is 100-120 micrometers, the thermocouple probe 2 is fixed on a current collector, then the electrode slurry is coated on the current collector fixed with the thermocouple probe 2, and the electrode slurry and the thermocouple probe 2 are dried and formed together to prepare the pre-buried thermocouple probe pole piece; the thickness of the thermocouple probe pole piece 1 is more than 120 microns, electrode slurry is coated on a current collector, a fixed thermocouple probe 2 is inserted before the electrode slurry is dried, and the electrode slurry and the thermocouple probe 2 are dried and molded together to prepare an embedded thermocouple probe pole piece; no matter which preparation method is adopted, the thermocouple probe 2 is preferably pre-embedded in the middle of the overall thickness of the thermocouple probe pole piece 1, so that the acquisition precision can be ensured, and the spatial arrangement is facilitated. Similarly, in order to ensure the acquisition accuracy, when a thermocouple probe 2 is pre-embedded in the thermocouple probe pole piece 1, the thermocouple probe 2 is fixed at the geometric center of the thermocouple probe pole piece 1; when more than two thermocouple probes 2 are embedded, the more than two thermocouple probes 2 should be fixed on the specific position of the thermocouple probe pole piece 1, and the specific position is preferably a position symmetrical to the geometric center of the thermocouple probe pole piece 1. And after the embedded thermocouple probe pole piece is prepared, assembling according to a normal lithium ion battery production process flow to prepare the lithium ion battery supporting in-situ measurement of the internal temperature of the battery.
According to the lithium ion battery supporting in-situ measurement of the internal temperature of the battery, the thermocouple probe 2 acquires the internal temperature of the battery in situ during use, the measurement terminal 21 is connected with corresponding data acquisition equipment to read thermoelectric force, and the temperature of a measurement point is obtained through calculation.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The lithium ion battery is characterized by comprising at least one thermocouple probe pole piece, wherein the thermocouple probe pole piece is a positive pole piece or a negative pole piece embedded with at least one thermocouple probe.
2. The lithium ion battery of claim 1, wherein the thermocouple probe is a T-type thermocouple or a K-type thermocouple having a wire diameter of less than 100 microns, and the thickness of the pole piece is 100 microns or greater.
3. The lithium ion battery of claim 2, wherein a thermocouple probe is embedded in the geometric center of the pole piece.
4. The lithium ion battery of claim 2, wherein more than two thermocouple probes are embedded in the thermocouple probe pole piece, and the more than two thermocouple probes are embedded in the pole piece symmetrically with respect to the geometric center of the pole piece.
5. The lithium ion battery of claim 3 or 4, wherein a thermocouple terminal corresponding to the thermocouple probe serves as a measurement terminal for connection to a battery thermal management system and/or the measurement terminal is connected to an external data acquisition instrument.
6. A manufacturing method of a lithium ion battery supporting in-situ measurement of the internal temperature of the battery is characterized by comprising the following steps of:
fixing a thermocouple probe on a current collector, coating electrode slurry on the current collector fixed with the thermocouple probe, and drying and molding the electrode slurry and the thermocouple probe together;
or, coating electrode slurry on the current collector, inserting a fixed thermocouple probe before drying the electrode slurry, and drying and molding the electrode slurry and the thermocouple probe together.
7. The method of claim 6, wherein the thickness of the pole piece is 100 to 120 microns, a thermocouple probe is fixed on a current collector, electrode slurry is coated on the current collector fixed with the thermocouple probe, and the electrode slurry and the thermocouple probe are dried and molded together to prepare an embedded thermocouple probe pole piece; the thickness of the pole piece is more than 120 microns, the embedded thermocouple probe pole piece is prepared by a method of coating electrode slurry on a current collector, inserting a fixed thermocouple probe before the electrode slurry is dried, and drying and molding the electrode slurry and the thermocouple probe together.
8. The method of claim 6,
fixing a thermocouple probe on the current collector corresponding to the geometric center of the pole piece, coating the electrode slurry on the current collector fixed with the thermocouple probe, and drying and molding the electrode slurry and the thermocouple probe together;
or, coating electrode slurry on the current collector, inserting and fixing a thermocouple probe in the geometric center position of the corresponding pole piece before the electrode slurry is dried, and drying and molding the electrode slurry and the thermocouple probe together.
9. The method of claim 6,
fixing more than two thermocouple probes at specific positions on a current collector corresponding to the pole pieces, coating electrode slurry on the current collector fixed with the thermocouple probes, and drying and molding the electrode slurry and the thermocouple probes together;
or, coating electrode slurry on the current collector, inserting and fixing more than two thermocouple probes at specific positions corresponding to the pole pieces before drying the electrode slurry, and drying and molding the electrode slurry and the thermocouple probes together.
10. The method of any one of claims 6 to 9, wherein the prepared pre-embedded thermocouple probe pole pieces are assembled according to a normal lithium ion battery production process flow.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112162202A (en) * | 2020-09-14 | 2021-01-01 | 欣旺达电动汽车电池有限公司 | Battery internal temperature detection method, system, device and storage medium |
| CN113097590A (en) * | 2021-04-01 | 2021-07-09 | 电子科技大学 | Lithium battery current collector with temperature sensing function and preparation method thereof |
| CN113839112A (en) * | 2021-08-16 | 2021-12-24 | 北京航空航天大学 | Method for wirelessly measuring internal temperature of battery in situ |
| WO2023013231A1 (en) * | 2021-08-05 | 2023-02-09 | パナソニックＩｐマネジメント株式会社 | Battery and method for manufacturing battery |
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| CN113839112A (en) * | 2021-08-16 | 2021-12-24 | 北京航空航天大学 | Method for wirelessly measuring internal temperature of battery in situ |
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Application publication date: 20200904 |