CN113131026B - Evaluation device and evaluation method for battery health state of hard-shell battery - Google Patents
Evaluation device and evaluation method for battery health state of hard-shell battery Download PDFInfo
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- CN113131026B CN113131026B CN202010259973.2A CN202010259973A CN113131026B CN 113131026 B CN113131026 B CN 113131026B CN 202010259973 A CN202010259973 A CN 202010259973A CN 113131026 B CN113131026 B CN 113131026B
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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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- 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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- 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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- 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
Abstract
The invention discloses an evaluation device and an evaluation method for the battery health state of a hard-shell battery, wherein the hard-shell battery comprises a hard shell and a battery core arranged in the hard shell, and a test device comprises: the cover plate is buckled at the top of the hard shell, and is provided with a positive connecting column, a negative connecting column and a reference electrode connecting column; and the reference electrode is arranged in the electric core, is connected to the reference electrode connecting column and is electrically insulated from the positive electrode and the negative electrode. The invention adds a reference electrode in the hard shell battery to prepare a three-electrode, utilizes the three-electrode to detect the potentials of the positive electrode and the negative electrode in the hard shell battery to obtain SOC-OCV curves of the positive electrode and the negative electrode in different stages, compares the SOC-OCV curves in different stages, and judges the attenuation degree of the positive electrode and the negative electrode, thereby comprehensively evaluating the SOH state of the hard shell battery.
Description
Technical Field
The invention belongs to the technical field of lithium batteries, and particularly relates to a device and a method for evaluating the battery health state of a hard-shell battery.
Background
The importance of energy storage and conversion systems in the aspects of economic construction, scientific and technological development, social progress and the like is continuously improved, and the requirements of static energy storage devices, pure electric vehicles, hybrid electric vehicles and the like on the performance of chemical power supplies are continuously improved. Lithium ion batteries as static energy storage devices are receiving more and more attention because of their advantages such as superior battery performance and large impact resistance.
The health state of the lithium ion battery is crucial to the safety of electric equipment, and the estimation and diagnosis of the health state of the battery can give early warning to battery faults and out of control in advance, so that unsafe behaviors of the battery are avoided. The service life of a lithium ion battery is an important parameter for evaluating the performance of the battery. The current common mode is to compare the voltage capacity curve and the impedance spectrum of the lithium ion battery under different service times to judge the health state of the battery so as to evaluate the service life of the lithium ion battery. However, most studies are now conducted to evaluate SOH of soft pack lithium batteries, and not to evaluate the service life of hard shell battery systems. The hard-shell battery system is more critical in the aspects of maintenance and safety guarantee of a power supply system, and therefore, development of a method for efficiently evaluating and predicting the service life of the hard-shell battery is urgently needed.
Disclosure of Invention
The invention aims to provide a method for efficiently evaluating and predicting the service life of a hard-shell battery and a method for diagnosing the health condition of the battery.
In order to achieve the above object, the present invention provides a battery state of health evaluation device for a hard-shell battery including a hard case and a cell provided in the hard case, the test device including: the cover plate is buckled at the top of the hard shell, a positive connecting column, a negative connecting column and a reference electrode connecting column are arranged on the cover plate, the positive connecting column is used for being connected with the positive electrode of the battery cell, the negative connecting column is used for being connected with the negative electrode of the battery cell, and the reference electrode connecting column is connected with a reference electrode; the reference electrode is arranged in the electric core, connected to the reference electrode connecting column and electrically insulated from the positive electrode and the negative electrode.
Preferably, the reference electrode is arranged between the positive electrode and the negative electrode, and a separator is wrapped outside the reference electrode.
Preferably, the reference electrode is made of one of lithium, a lithium-plated copper wire, a lithium metal alloy and lithium titanate.
Preferably, the positive connecting column is connected with the positive electrode in a welding mode, the negative connecting column is connected with the negative electrode in a welding mode, and the reference electrode connecting column is connected with the reference electrode in a welding mode.
Preferably, the cover plate is also provided with an explosion-proof hole and a liquid injection port.
The invention also provides a method for evaluating the battery health state of the hard-shell battery, which utilizes the testing device and comprises the following steps of 1: connecting a positive electrode input end of a voltage acquisition device with the positive connecting column, connecting a negative electrode input end with the negative connecting column, and connecting a reference electrode input end with the reference electrode connecting column; and 2, step: the hard shell battery is charged and discharged, and in the charging and discharging processes, the charge state parameters of the hard shell battery, the corresponding voltage P1 between the positive electrode and the reference electrode, the voltage P2 between the negative electrode and the reference electrode, and the voltage P3 between the positive electrode and the negative electrode are acquired in real time; and step 3: based on the P1, P2, and P3, SOC-OCV curves were plotted.
Preferably, the method for evaluating the battery health status of a hard-shell battery further comprises: connecting a positive input end of an impedance acquisition device with the positive connecting column, connecting a negative input end with the positive connecting column and the negative connecting column, and connecting a reference electrode input end with the reference electrode connecting column; starting the impedance acquisition device to acquire the impedance of the anode, the impedance of the cathode and the full resistance; and drawing an impedance spectrum based on the impedance of the positive electrode, the impedance of the negative electrode and the full resistance.
Preferably, the test method is performed before the first use of the hard-shell battery and after a preset period of use.
Preferably, comparing the SOC-OCV curve of the hard-shell battery before the hard-shell battery is used for the first time with the SOC-OCV curve of the hard-shell battery after the hard-shell battery is used for a preset time period, extracting characteristic points according to the comparison result, judging the polarization degree of the hard-shell battery cell through the characteristic points, and determining that the hard-shell battery cell reaches the end of service life when the polarization degree is greater than a first preset threshold value;
comparing the impedance spectrum of the hard-shell battery before the hard-shell battery is used for the first time with the impedance spectrum of the hard-shell battery after the hard-shell battery is used for a preset time period, and acquiring contact impedance and electron transfer impedance; and when the contact impedance is larger than a second preset threshold or the electron transfer impedance is larger than a third preset threshold, determining that the hard shell cell is attenuated.
Preferably, the hard shell battery is charged by constant current and constant voltage, and the charging multiplying power ranges from 0.3C to 2C; discharging the hard-shelled battery at a constant current.
Preferably, the impedance test frequency range of the impedance acquisition device is 100mHz to 10 KHz.
The invention has the beneficial effects that: according to the evaluation device and the evaluation method for the battery health state of the hard shell battery, the reference electrode is added in the hard shell battery to prepare the three electrodes, the three electrodes are used for detecting the potentials of the positive electrode and the negative electrode in the hard shell battery, SOC-OCV curves of the positive electrode and the negative electrode in different stages are obtained, the SOC-OCV curves of the positive electrode and the negative electrode in different stages are compared, the attenuation degree of the positive electrode and the negative electrode is judged, and therefore the SOH state of the hard shell battery is comprehensively evaluated.
The system of the present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings. Wherein like reference numerals generally refer to like parts throughout the exemplary embodiments of the invention.
Fig. 1 shows a schematic view of the connection structure of the lid plate of the battery state of health evaluation device of the hard-shell battery according to one embodiment of the present invention.
Fig. 2 shows a schematic diagram of a connection structure of a cell and a reference electrode of the battery state of health evaluation device of the hard-shell battery according to one embodiment of the invention.
Fig. 3 shows an SOC-OCV curve of the hard-shell battery pre-initial use test of the apparatus for evaluating the state of health of a hard-shell battery according to an embodiment of the present invention.
Fig. 4 shows positive and negative ac impedance spectra of a hard-shell battery tested prior to initial use of the hard-shell battery of an apparatus for assessing battery state of health of a hard-shell battery according to one embodiment of the present invention.
Fig. 5 shows SOC-OCV curves tested after a preset period of use of a hard-shell battery of the apparatus for evaluating battery state of health of a hard-shell battery according to one embodiment of the present invention.
Fig. 6 shows positive and negative ac impedance spectra of a hard-shell battery of an apparatus for assessing battery state of health of a hard-shell battery, tested after use for a preset period of time, according to one embodiment of the invention.
Fig. 7 shows a flow diagram of a method of assessing battery state of health of a hard-shell battery according to one embodiment of the invention.
Description of the reference numerals:
1. a cover plate; 2. a positive connecting column; 3. a negative connecting column; 4. a reference electrode connecting column; 5. an explosion-proof hole; 6. a liquid injection port; 7. an electric core; 8. a negative electrode; 9. a positive electrode; 10. a reference electrode.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
According to the invention, the hard shell battery comprises a hard shell and a battery core arranged in the hard shell, and the testing device comprises: the cover plate is buckled at the top of the hard shell, and is provided with a positive connecting column, a negative connecting column and a reference electrode connecting column; the reference electrode is arranged in the electric core, connected to the reference electrode connecting column and electrically insulated from the anode and the cathode.
Specifically, the produced positive electrode, negative electrode and diaphragm are manufactured into battery cells according to a laminated type or a winding type, a plurality of groups of battery cells form a lithium ion battery pack, and a reference electrode prepared in advance is added into the diaphragm. And (3) putting the battery cell with the reference electrode into the hard shell, welding a positive electrode lug on a positive electrode connecting column and a negative electrode connecting column of the cover plate, welding a negative electrode lug on the negative electrode connecting column of the cover plate, and welding the reference electrode on the reference electrode connecting column. Other battery assembly techniques are known to those skilled in the art and will not be described in detail herein.
According to an exemplary embodiment, the evaluation device for the battery health state of the hard-shell battery is characterized in that a reference electrode is added in the hard-shell battery to prepare a three-electrode, the three-electrode is used for detecting the potentials of the positive electrode and the negative electrode in the hard-shell battery to obtain SOC-OCV curves of the positive electrode and the negative electrode in different stages, the SOC-OCV curves of the positive electrode and the negative electrode in different stages are compared, and the attenuation degree of the positive electrode and the negative electrode is judged, so that the SOH state of the hard-shell battery is comprehensively evaluated.
Preferably, the reference electrode is arranged between the positive electrode and the negative electrode, and the outside of the reference electrode is wrapped by the diaphragm.
Specifically, the position of the reference electrode in the battery core is selected to be in direct contact with the diaphragm in the hard-shell battery, and not in direct contact with the positive electrode and the negative electrode in the battery.
Preferably, the reference electrode is made of one of lithium, a lithium-plated copper wire, a lithium metal alloy and lithium titanate.
Specifically, the hard-shell battery comprises a cylindrical shell, a square shell, a steel shell and an aluminum shell. The reference electrode is made of any one of a metal lithium electrode, a lithium-plated copper wire electrode, a lithium metal alloy electrode and a lithium titanate electrode.
As a preferred scheme, the anode connecting column is connected with the anode in a welding mode, the cathode connecting column is connected with the cathode in a welding mode, and the reference electrode connecting column is connected with the reference electrode in a welding mode.
As the preferred scheme, still be equipped with explosion-proof hole and annotate the liquid mouth on the apron.
According to the method for evaluating the battery health state of the hard-shell battery, the testing device is utilized, and the method comprises the following steps of 1: connecting a positive electrode input end of a voltage acquisition device with a positive connecting column, connecting a negative electrode input end with a negative connecting column, and connecting a reference electrode input end with a reference electrode connecting column; step 2: the hard shell battery is charged and discharged, and in the charging and discharging process, the charge state parameters of the hard shell battery, the corresponding voltage P1 between the positive electrode and the reference electrode, the voltage P2 between the negative electrode and the reference electrode and the voltage P3 between the positive electrode and the negative electrode are acquired in real time; and step 3: based on P1, P2, and P3, SOC-OCV curves were plotted.
Specifically, the hard shell battery is charged and discharged, and in the charging and discharging process, the potential change of the positive electrode and the negative electrode relative to the reference electrode can be detected by using the reference electrode, so that the SOC-OCV curve of the battery is obtained, and the evaluation of the SOH of the hard shell lithium ion battery is realized. Meanwhile, the lithium separated from the negative electrode can be detected.
According to an exemplary embodiment, the evaluation method for the battery health state of the hard-shell battery is characterized in that a reference electrode is added in the hard-shell battery to prepare a three-electrode, the three-electrode is used for detecting the potentials of the positive electrode and the negative electrode in the hard-shell battery to obtain SOC-OCV curves of the positive electrode and the negative electrode in different stages, and the SOC-OCV curves of the positive electrode and the negative electrode in different stages are compared to judge the attenuation degree of the positive electrode and the negative electrode, so that the SOH state of the hard-shell battery is comprehensively evaluated, and the evaluation method has strong operability and high accuracy.
Preferably, the method for evaluating the battery health status of a hard-shell battery further comprises: connecting the positive input end of the impedance acquisition device with a positive connecting column, connecting the negative input end of the impedance acquisition device with a positive connecting column and a negative connecting column, and connecting the reference electrode input end with a reference electrode connecting column; starting an impedance acquisition device, and acquiring the impedance of a positive electrode, the impedance of a negative electrode and full resistance in real time; and drawing an impedance spectrum based on the impedance of the positive electrode, the impedance of the negative electrode and the full resistance.
Specifically, the hard shell battery is subjected to impedance testing, in the impedance testing process, an impedance acquisition device is connected to the hard shell battery with three electrodes to obtain an anode and cathode alternating current impedance spectrum, and the evaluation of the SOH of the hard shell lithium ion battery is realized by combining an SOC-OCV curve.
According to an exemplary embodiment, the evaluation method for the battery health state of the hard-shell battery is characterized in that a reference electrode is added in the hard-shell battery to prepare a three-electrode, the three-electrode is used for detecting the potentials of a positive electrode and a negative electrode in the hard-shell battery to obtain positive and negative electrode impedance spectrums in different stages, SOC-OCV curves and the impedance spectrums in the different stages are compared, and the attenuation degree of the positive electrode and the negative electrode is judged, so that the SOH state of the hard-shell battery is comprehensively evaluated.
Preferably, the test method is performed before the initial use of the hard-shell battery and after a predetermined period of use.
As a preferred scheme, comparing an SOC-OCV curve before the hard shell battery is used for the first time with an SOC-OCV curve after the hard shell battery is used for a preset time period, extracting characteristic points according to the comparison result, judging the polarization degree of the hard shell battery cell through the characteristic points, and determining that the hard shell battery cell reaches the end of the service life when the polarization degree is greater than a first preset threshold value;
comparing an impedance spectrum before the hard-shell battery is used for the first time with an impedance spectrum after the hard-shell battery is used for a preset time period to obtain contact impedance and electron transfer impedance; and when the contact impedance is larger than a second preset threshold or the electron transfer impedance is larger than a third preset threshold, determining the attenuation of the hard shell battery core.
Specifically, an SOC-OCV curve and a positive and negative impedance spectrum before the hard shell battery is used for the first time and an SOC-OCV curve and a positive and negative impedance spectrum after the hard shell battery is used for a preset time period are respectively obtained, the SOC-OCV curves of the two conditions are compared, characteristic points are extracted according to a comparison result, the polarization degree of the hard shell battery cell is judged according to the characteristic points, and when the polarization degree is larger than a first preset threshold value, a voltage platform is lowered (discharged), and the hard shell battery cell is determined to reach the end of service life. And comparing the impedance spectrums of the two conditions to obtain contact impedance and electron transfer impedance, and judging the state of the cathode in the battery cell according to the sizes of the contact impedance and the electron transfer impedance. When the contact resistance is larger, the voltage attenuation is obvious along with the increase of the current; when the electron transfer impedance is too large, the diffusion rate of lithium ions is slow due to the complex porous structure in the battery cell, concentration gradient is generated, concentration polarization is caused, and once the indexes exceed empirical values, the attenuation degree of the battery cell is very obvious.
As a preferred scheme, the hard shell battery is charged by constant current and constant voltage, and the charging multiplying power ranges from 0.3C to 2C; the hard-shelled battery was discharged at a constant current.
Specifically, the hard-shell battery is charged, for example, at a constant current and a constant voltage at 1C, and discharged at 1C.
As a preferred scheme, the impedance test frequency range of the impedance acquisition device is 100 mHz-10 KHz.
Example one
Fig. 1 shows a schematic view of the connection structure of the lid plate of the battery state of health evaluation device of the hard-shell battery according to one embodiment of the present invention. Fig. 2 shows a schematic diagram of a connection structure of a cell and a reference electrode of the battery state of health evaluation device of the hard-shell battery according to one embodiment of the invention. Fig. 3 shows an SOC-OCV curve of a hard-shell battery tested before initial use of the hard-shell battery of the apparatus for evaluating the battery state of health of the hard-shell battery according to one embodiment of the present invention. Fig. 4 shows positive and negative polarity ac impedance spectra of the hard-shell battery test apparatus for evaluating battery state of health of the hard-shell battery according to one embodiment of the present invention before initial use. Fig. 5 shows SOC-OCV curves tested after a preset period of use of a hard-shell battery of the apparatus for evaluating battery state of health of a hard-shell battery according to one embodiment of the present invention. Fig. 6 shows positive and negative ac impedance spectra of a hard-shell battery of an apparatus for assessing battery state of health of a hard-shell battery, tested after use for a preset period of time, according to one embodiment of the invention.
With reference to fig. 1, 2, 3, 4, 5 and 6, the apparatus for evaluating the state of health of a hard-shell battery includes a hard shell and a cell disposed in the hard shell, and the testing apparatus includes: the battery cell comprises a cover plate 1, wherein the cover plate 1 is buckled at the top of a hard shell, the cover plate is provided with a positive connecting column 2, a negative connecting column 3 and a reference electrode connecting column 4, the positive connecting column 2 is used for being connected with a positive electrode 9 of a battery cell, the negative connecting column 3 is used for being connected with a negative electrode 8 of the battery cell, and the reference electrode connecting column 4 is connected with a reference electrode 10; and the reference electrode 10 is arranged in the electric core, and the reference electrode 10 is connected to the reference electrode connecting column 4 and is electrically insulated from the positive electrode 9 and the negative electrode 8.
The reference electrode 10 is arranged between the positive electrode 9 and the negative electrode 8, and the outside of the reference electrode 10 is wrapped by a diaphragm.
The reference electrode 10 is made of one of lithium, a lithium-plated copper wire, a lithium metal alloy and lithium titanate.
The anode connecting column 2 is connected with the anode 9 in a welding mode, the cathode connecting column 3 is connected with the cathode 8 in a welding mode, and the reference electrode connecting column 4 is connected with the reference electrode 10 in a welding mode.
Wherein, the cover plate 1 is also provided with an explosion-proof hole 5 and a liquid injection port 6.
Example two
Fig. 7 shows a flow diagram of a method of assessing battery state of health of a hard-shell battery according to one embodiment of the invention.
As shown in fig. 7, the method for evaluating the battery health status of the hard-shell battery, using the testing apparatus, comprises the steps of 1: connecting a positive electrode input end of a voltage acquisition device with a positive electrode connecting column, connecting a negative electrode input end with a negative electrode connecting column, and connecting a reference electrode input end with a reference electrode connecting column; step 2: the hard shell battery is charged and discharged, and in the charging and discharging process, the charge state parameters of the hard shell battery, the corresponding voltage P1 between the positive electrode and the reference electrode, the voltage P2 between the negative electrode and the reference electrode and the voltage P3 between the positive electrode and the negative electrode are acquired in real time; and 3, step 3: based on P1, P2, and P3, SOC-OCV curves were plotted.
The method for evaluating the battery health state of the hard-shell battery further comprises the following steps: connecting the positive input end of the impedance acquisition device with a positive connecting column, connecting the negative input end of the impedance acquisition device with a positive connecting column and a negative connecting column, and connecting the reference electrode input end with a reference electrode connecting column; starting an impedance acquisition device, and acquiring the impedance of the positive electrode, the impedance of the negative electrode and the full resistance in real time; and drawing an impedance spectrum based on the impedance of the positive electrode, the impedance of the negative electrode and the full resistance.
Wherein the test method is performed before initial use of the hard-shell battery and after a preset period of use.
The method comprises the steps of comparing an SOC-OCV curve of a hard shell battery before initial use with an SOC-OCV curve of the hard shell battery after a preset period of use, extracting characteristic points according to a comparison result, judging the polarization degree of a hard shell battery cell through the characteristic points, and determining that the hard shell battery cell reaches the end of service life when the polarization degree is greater than a first preset threshold value;
comparing an impedance spectrum before the hard-shell battery is used for the first time with an impedance spectrum after the hard-shell battery is used for a preset time period to obtain contact impedance and electron transfer impedance; and when the contact impedance is larger than a second preset threshold or the electron transfer impedance is larger than a third preset threshold, determining the attenuation of the hard shell battery core.
Wherein, the hard shell battery is charged by constant current and constant voltage, and the charging multiplying power ranges from 0.3C to 2C; the hard-shelled battery was discharged at a constant current.
Wherein, the impedance test frequency range of the impedance acquisition device is 100 mHz-10 KHz.
While embodiments of the present invention have been described above, the above description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.
Claims (7)
1. A method for assessing the state of health of a hard-shell battery, using an apparatus for assessing the state of health of a hard-shell battery comprising a rigid housing and a cell disposed within the rigid housing, the apparatus comprising:
the cover plate is buckled at the top of the hard shell, a positive connecting column, a negative connecting column and a reference electrode connecting column are arranged on the cover plate, the positive connecting column is used for being connected with the positive electrode of the battery cell, the negative connecting column is used for being connected with the negative electrode of the battery cell, and the reference electrode connecting column is connected with a reference electrode;
the reference electrode is arranged in the electric core, is connected to the reference electrode connecting column and is electrically insulated from the positive electrode and the negative electrode;
the reference electrode is arranged between the positive electrode and the negative electrode, and a diaphragm is wrapped outside the reference electrode;
the evaluation method comprises the following steps:
step 1: connecting a positive electrode input end of a voltage acquisition device with the positive connecting column, connecting a negative electrode input end with the negative connecting column, and connecting a reference electrode input end with the reference electrode connecting column;
step 2: the hard shell battery is charged and discharged, and in the charging and discharging processes, the charge state parameters of the hard shell battery, the corresponding voltage P1 between the positive electrode and the reference electrode, the voltage P2 between the negative electrode and the reference electrode, and the voltage P3 between the positive electrode and the negative electrode are acquired in real time;
and step 3: drawing a SOC-OCV curve based on the P1, P2 and P3;
the test method is performed before the first use of the hard-shell battery and after a preset period of use;
and comparing the SOC-OCV curve of the hard shell battery before the hard shell battery is used for the first time with the SOC-OCV curve of the hard shell battery after the hard shell battery is used for a preset period of time, extracting characteristic points according to the comparison result, judging the polarization degree of the hard shell battery cell through the characteristic points, and determining that the hard shell battery cell reaches the end of the service life when the polarization degree is greater than a first preset threshold value.
2. The method of claim 1, wherein the reference electrode is made of one of lithium, a plated copper wire, a lithium metal alloy, and lithium titanate.
3. The method of assessing the state of health of a hard-shell battery of claim 1, wherein said positive connection post is connected to said positive electrode by welding, said negative connection post is connected to said negative electrode by welding, and said reference electrode connection post is connected to said reference electrode by welding.
4. The method of claim 1, wherein the cover plate further comprises a vent and a pour port.
5. The method of assessing the state of health of a hard-shell battery of claim 1, further comprising: connecting a positive input end of an impedance acquisition device with the positive connecting column, connecting a negative input end with the negative connecting column, and connecting a reference electrode input end with the reference electrode connecting column;
starting the impedance acquisition device to acquire the impedance of the anode, the impedance of the cathode and the full resistance; and drawing an impedance spectrum based on the impedance of the positive electrode, the impedance of the negative electrode and the full resistance.
6. The method for assessing the state of health of a hard-shell battery according to claim 5,
comparing the impedance spectrum of the hard-shell battery before the hard-shell battery is used for the first time with the impedance spectrum of the hard-shell battery after the hard-shell battery is used for a preset time period, and acquiring contact impedance and electron transfer impedance; and when the contact impedance is larger than a second preset threshold or the electron transfer impedance is larger than a third preset threshold, determining that the hard shell cell is attenuated.
7. The method for evaluating the state of health of a hard-shell battery according to claim 5, wherein the hard-shell battery is charged at a constant current and a constant voltage, and the charging rate is in the range of 0.3C to 2C; discharging the hard-shell battery at a constant current; the impedance test frequency range of the impedance acquisition device is 100 mHz-10 KHz.
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| CN114019390A (en) * | 2021-09-30 | 2022-02-08 | 广东微电新能源有限公司 | Three-electrode battery testing device |
| CN114114053B (en) * | 2021-12-10 | 2023-12-22 | 厦门金龙联合汽车工业有限公司 | Method for measuring life state of battery of hybrid vehicle |
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