CN116973792A - Battery health degree detection method, device, equipment and medium - Google Patents
Battery health degree detection method, device, equipment and medium Download PDFInfo
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- CN116973792A CN116973792A CN202310952550.2A CN202310952550A CN116973792A CN 116973792 A CN116973792 A CN 116973792A CN 202310952550 A CN202310952550 A CN 202310952550A CN 116973792 A CN116973792 A CN 116973792A
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- 230000036541 health Effects 0.000 title claims abstract description 82
- 238000001514 detection method Methods 0.000 title claims abstract description 13
- 239000003792 electrolyte Substances 0.000 claims abstract description 95
- 238000000034 method Methods 0.000 claims abstract description 51
- 239000013543 active substance Substances 0.000 claims abstract description 24
- 239000007772 electrode material Substances 0.000 claims description 151
- 230000005284 excitation Effects 0.000 claims description 23
- 230000006866 deterioration Effects 0.000 claims description 15
- 230000015556 catabolic process Effects 0.000 claims description 11
- 238000006731 degradation reaction Methods 0.000 claims description 11
- 238000001453 impedance spectrum Methods 0.000 claims description 9
- 239000007774 positive electrode material Substances 0.000 claims description 9
- 230000001186 cumulative effect Effects 0.000 claims 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000012544 monitoring process Methods 0.000 abstract description 6
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- 239000002253 acid Substances 0.000 description 3
- 238000013507 mapping Methods 0.000 description 3
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- 239000011149 active material Substances 0.000 description 2
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- 239000004065 semiconductor Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 208000032953 Device battery issue Diseases 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- 150000002500 ions Chemical class 0.000 description 1
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- 229910001416 lithium ion Inorganic materials 0.000 description 1
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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
- 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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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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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Abstract
The disclosure provides a battery health detection method, device, equipment and medium, wherein the method comprises the following steps: the method comprises the steps of obtaining an electrolyte internal resistance value of a battery to be tested and a reference battery in the same target electric quantity, an intrinsic internal resistance value of an electrode active substance and a contact internal resistance value of the electrode active substance, wherein the battery to be tested and the reference battery belong to the same battery, and determining the health state of the battery to be tested based on the electrolyte internal resistance value of the battery to be tested and the reference battery in the target electric quantity, the intrinsic internal resistance value of the electrode active substance and the contact internal resistance value of the electrode active substance. The method can accurately determine the health state of the battery to be detected, thereby achieving the purpose of accurately monitoring the monitoring state of the battery to be detected and reducing the probability of battery faults.
Description
Technical Field
The present invention relates to the field of energy storage technologies, and in particular, to a method, an apparatus, a device, and a medium for detecting battery health.
Background
When detecting the State Of Health (SOH) Of an energy storage battery such as a lead-acid battery or a lead-carbon battery, the SOH Of the energy storage battery is generally estimated using the ac resistance value Of the energy storage battery.
In the related art, as the usage time of the energy storage battery increases, the correspondence between the ac resistance value of the energy storage battery and the SOH of the energy storage battery is affected, resulting in difficulty in accurately estimating the SOH of the energy storage battery using the ac resistance value of the energy storage battery.
Disclosure of Invention
According to an aspect of the present disclosure, there is provided a battery health detection method, the method including:
the method comprises the steps of obtaining an electrolyte internal resistance value of a battery to be tested and a reference battery in the same target electric quantity, an intrinsic internal resistance value of an electrode active material and a contact internal resistance value of the electrode active material, wherein the battery to be tested and the reference battery belong to the same type of battery, and the contact internal resistance value of the electrode active material is the contact internal resistance of the electrode active material and a current collector;
and determining the health state of the battery to be tested based on the internal resistance value of the electrolyte of the battery to be tested and the reference battery in the target electric quantity, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material.
According to another aspect of the present disclosure, there is provided a battery health degree detection apparatus including:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the internal resistance value of electrolyte of a battery to be tested and a reference battery in the same target electric quantity, the intrinsic internal resistance value of an electrode active substance and the contact internal resistance value of the electrode active substance, the battery to be tested and the reference battery belong to the same type of battery, and the contact internal resistance value of the electrode active substance is the contact internal resistance of the electrode active substance and a current collector;
And the determining module is used for determining the health state of the battery to be tested based on the internal resistance value of the electrolyte of the battery to be tested and the reference battery in the target electric quantity, the intrinsic internal resistance value of the electrode active substance and the contact internal resistance value of the positive electrode active substance.
According to another aspect of the present disclosure, there is provided an electronic device including:
a processor; the method comprises the steps of,
a memory storing a program;
wherein the program comprises instructions which, when executed by the processor, cause the processor to perform a method according to an exemplary embodiment of the present disclosure.
According to another aspect of the present disclosure, there is provided a non-transitory computer readable storage medium storing computer instructions for causing the computer to perform the method according to an exemplary embodiment of the present disclosure.
According to one or more technical schemes provided in the exemplary embodiments of the present disclosure, an internal resistance value of an electrolyte, an intrinsic internal resistance value of an electrode active material, and a contact internal resistance value of the electrode active material, which belong to the same type of battery to be measured and a reference battery in the same target electric quantity, may be obtained, where the internal resistance value of the electrolyte is related to a conductivity degree of the electrolyte, the intrinsic internal resistance value of the electrode active material may reflect a degree of change in a discharge structure of the electrode active material, and the contact internal resistance value of the electrode active material is a contact internal resistance of the electrode active material and a current collector, which may reflect a degree of corrosion of the current collector. Therefore, the internal resistance value of the electrolyte of the to-be-measured battery and the reference battery in the target electric quantity, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material in the exemplary embodiment of the disclosure can reflect the influence of the electrolyte conductivity of the to-be-measured battery and the reference battery in the target electric quantity, the electrode active material discharging structure and the corrosion degree of the positive current collector on the internal resistance of the battery more accurately, so that the exemplary embodiment of the disclosure can accurately determine the health state of the to-be-measured battery based on the internal resistance value of the electrolyte of the to-be-measured battery and the reference battery in the target electric quantity, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the active material, thereby achieving accurate monitoring of the monitored state of the to-be-measured battery and reducing the probability of battery faults.
Drawings
Further details, features and advantages of the present disclosure are disclosed in the following description of exemplary embodiments, with reference to the following drawings, wherein:
fig. 1 shows a flow diagram of a battery health detection method according to an exemplary embodiment of the present disclosure;
FIG. 2 illustrates a schematic diagram of a determination of the state of health of a battery under test according to an exemplary embodiment of the present disclosure;
fig. 3 shows a schematic diagram of an internal resistance measurement system of an exemplary embodiment of the present disclosure;
FIG. 4 shows a functional block diagram of a battery health detection device according to an exemplary embodiment of the present disclosure;
FIG. 5 shows a schematic block diagram of a chip according to an exemplary embodiment of the present disclosure;
fig. 6 illustrates a block diagram of an exemplary electronic device that can be used to implement embodiments of the present disclosure.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure have been shown in the accompanying drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.
It should be understood that the various steps recited in the method embodiments of the present disclosure may be performed in a different order and/or performed in parallel. Furthermore, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect.
The term "including" and variations thereof as used herein are intended to be open-ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments. Related definitions of other terms will be given in the description below. It should be noted that the terms "first," "second," and the like in this disclosure are merely used to distinguish between different devices, modules, or units and are not used to define an order or interdependence of functions performed by the devices, modules, or units.
It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be understood as "one or more" unless the context clearly indicates otherwise.
When detecting the State Of Health (SOH) Of an energy storage battery such as a lead-acid battery or a lead-carbon battery, the SOH Of the energy storage battery is generally estimated using the ac resistance value Of the energy storage battery, or the SOH Of the battery may be determined using a gradient Of current drop during battery discharge.
In the related art, the ac resistance value or the dynamic voltage value of the same type of battery at various sizes SOH can be obtained in advance, so as to obtain the corresponding relationship between the health state of the same type of battery and the ac resistance value or the dynamic voltage value. And then acquiring an alternating current resistance value or a dynamic voltage value of the battery to be measured, and searching SOH of the battery to be measured from the corresponding relation.
The inventors have found that as the battery positive current collector grid corrodes and the battery positive active material (e.g., pbO 2 ) Is caused to have irregular changes in internal resistance of the battery; meanwhile, ions released by corrosion of the positive current collector enter the battery electrolyte, so that the conductivity of the battery electrolyte is also uncertain, and therefore, the battery SOH is difficult to accurately calculate through the battery internal resistance determined in a conventional mode, and the battery state cannot be accurately monitored.
In view of the above problems, exemplary embodiments of the present disclosure provide a method for detecting the health of a battery, which can fully reflect the influence of the conductivity change of the electrolyte, the structural change of the positive electrode active material, and the corrosion degree of the positive electrode current collector on the health of the battery by using the change of the internal resistance value of the electrolyte, the change of the intrinsic internal resistance value of the electrode active material, and the change of the contact internal resistance value of the electrode active material, so as to accurately determine the health state of the battery to be detected, and then accurately monitor the monitoring state of the battery to be detected, thereby reducing the probability of battery failure.
Fig. 1 shows a flow diagram of a battery health detection method according to an exemplary embodiment of the present disclosure. As shown in fig. 1, a battery health detection method of an exemplary embodiment of the present disclosure may include:
step 101: and obtaining the internal resistance value of the electrolyte of the battery to be detected and the reference battery in the same target electric quantity, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material, wherein the contact internal resistance value of the electrode active material is the contact internal resistance of the electrode active material and the positive electrode current collector.
In practical application, the battery to be tested and the reference battery can belong to the same type of battery, and can be the same type of battery produced in the same batch or the same battery with different using time lengths. Such batteries may include lead-acid batteries, lead-carbon batteries, and the like, or may include various lithium-metal batteries, lithium-ion batteries, and the like, or may be other various batteries suitable for use in the exemplary embodiments of the present disclosure, without limitation.
The target electric quantity can be 40% -80% when the electrolyte internal resistance value of the battery to be detected and the reference battery in the same target electric quantity, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material are obtained. In order to reduce the loss to the battery, the target power here may be 50% -70%, for example: 50%, 55%, 60%, 65% or 70%.
Step 102: and determining the health state of the battery to be tested based on the internal resistance value of the electrolyte of the battery to be tested and the reference battery in the target electric quantity, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material.
In practical applications, the intrinsic internal resistance value of the electrode active material of the exemplary embodiment of the present disclosure may include the internal resistance value of the positive electrode active material and the internal resistance value of the negative electrode active material, and the contact internal resistance of the electrode active material may include the contact internal resistance value of the positive electrode active material and the positive electrode current collector, as well as the contact internal resistance value of the negative electrode active material and the negative electrode current collector.
The internal resistance value of the negative electrode active material and the contact internal resistance change of the negative electrode active material and the negative electrode current collector of the battery to be tested and the reference battery under the same target electric quantity are considered to be small, so that the state of health of the battery to be tested can be accurately determined, the monitoring state of the battery to be tested can be accurately monitored based on the change of the internal resistance value of the electrolyte, the change of the intrinsic internal resistance value of the electrode active material and the influence of the change of the contact internal resistance value of the electrode active material on the battery electrolyte conductivity, the structural change of the positive electrode active material and the corrosion degree of the positive electrode current collector on the battery health degree, and the probability of battery faults can be reduced by utilizing the change of the internal resistance value of the electrolyte, the change of the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material.
In one possible implementation manner, the accumulated use time length of the reference battery according to the exemplary embodiment of the present disclosure is smaller than the preset time length, and the accumulated use time length of the battery to be measured is longer than the accumulated use time length of the reference battery. The reference battery and the battery to be tested according to the exemplary embodiments of the present disclosure are distinguished by the length of the accumulated use time, and meanwhile, by controlling the accumulated use time of the reference battery to be less than the preset length of time, it is ensured that the current collector corrosion degree, the electrode active material structure and the conductivity of the electrolyte of the reference battery are not greatly changed relative to the freshly prepared battery. Based on the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the positive electrode active material of the battery to be measured and the reference battery in the target electric quantity, the determined health state of the battery to be measured is accurate, and the change of the health degree of the battery to be measured relative to the newly prepared battery can be approximately reflected.
When the battery to be measured and the reference battery are the same battery with different accumulated use time periods, the battery can be regarded as the reference battery when the accumulated use time period of the battery is smaller than the first preset time period, the reference battery is discharged until the battery electric quantity reaches the target electric quantity, and then the internal resistance value of electrolyte, the intrinsic internal resistance value of electrode active material and the contact internal resistance value of the electrode active material of the reference battery in the same target electric quantity are measured. And then continuing to use the battery, when the accumulated use time length of the battery is longer than or equal to a second preset time length, considering the battery as the battery to be tested, then discharging the battery to be tested until the battery electric quantity reaches the target electric quantity, and then measuring the internal resistance value of electrolyte, the intrinsic internal resistance value of electrode active substances and the contact internal resistance value of the electrode active substances of the battery to be tested in the same target electric quantity.
In one possible implementation manner, the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material of the battery to be measured in the target electric quantity may correspond to the same excitation voltage, and the frequency band of the excitation voltage corresponding to the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material of the battery to be measured in the target electric quantity is gradually reduced. The internal resistance value of the electrolyte of the battery to be measured in the target electric quantity, the intrinsic internal resistance value of the electrode active material and the frequency band of the excitation voltage corresponding to the contact internal resistance value of the electrode active material can be determined by the electrochemical impedance spectrum of the battery to be measured in the target electric quantity.
In practical application, the internal resistance value of the electrolyte of the battery to be measured in the target electric quantity, the intrinsic internal resistance value of the electrode active material, and the excitation voltage corresponding to the contact internal resistance value of the electrode active material can be regarded as the alternating voltage applied to the positive and negative terminals of the battery to be measured, and the frequency band where the excitation voltage corresponding to the contact internal resistance value of the electrode active material is located can be accurately determined by analyzing the electrochemical impedance spectrum of the battery to be measured in the target electric quantity.
According to the reference battery in the exemplary embodiment of the disclosure, the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material and the excitation voltage corresponding to the contact internal resistance value of the electrode active material of the reference battery are the same, the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material and the frequency band of the excitation voltage corresponding to the contact internal resistance value of the electrode active material of the reference battery in the target battery are gradually reduced, and the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material and the frequency band of the excitation voltage corresponding to the contact internal resistance value of the electrode active material of the reference battery in the target battery are determined by the electrochemical impedance spectrum of the battery to be measured.
In practical application, the internal resistance value of the electrolyte of the reference battery in the target electric quantity, the intrinsic internal resistance value of the electrode active material, and the excitation voltage corresponding to the contact internal resistance value of the electrode active material can be considered as the alternating voltage applied to the positive and negative terminals of the reference battery, and the internal resistance value of the electrolyte of the reference battery in the target electric quantity, the intrinsic internal resistance value of the electrode active material, and the frequency band of the excitation voltage corresponding to the contact internal resistance value of the electrode active material can be accurately determined by analyzing the electrochemical impedance spectrum of the reference battery in the target electric quantity.
For convenience, the exemplary embodiments of the present disclosure may be understood by analyzing electrochemical impedance spectra of the battery, that the internal resistance of the battery determined at the high frequency ac voltage corresponds to the internal resistance value of the electrolyte, that the internal resistance of the battery determined at the medium frequency ac voltage corresponds to the intrinsic internal resistance value of the electrode active material, and that the internal resistance of the battery determined at the low frequency ac voltage corresponds to the internal resistance of the electrode active material in contact with the current collector. The voltage values (or voltage amplitudes) of the high frequency alternating voltage, the low frequency alternating voltage and the intermediate frequency alternating voltage of the exemplary embodiments of the present disclosure may be equal, the frequency of the high frequency alternating voltage may be an alternating voltage greater than 1KHz, for example, the frequency range may be greater than 1KHz to 10KHz, the frequency range of the intermediate frequency alternating voltage may be 10 -3 Hz～10 3 Hz. For example: the frequency of the medium-frequency alternating voltage can be 1KHz, and the frequency of the low-frequency alternating voltage can be more than or equal to 10 -3 Hz is less than 1KHz.
In one possible implementation, fig. 2 shows a schematic diagram of a determination flow of the state of health of a battery under test according to an exemplary embodiment of the present disclosure. As shown in fig. 2, determining a state of health of the battery to be measured according to the exemplary embodiment of the present disclosure based on the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material, and the contact internal resistance value of the positive electrode active material of the battery to be measured and the reference battery at the target electric quantity may include:
Step 201: and determining the health degree of the electrolyte based on the internal resistance value of the electrolyte of the battery to be tested and the reference battery in the target electric quantity. The degree of health of the electrolyte is inversely related to the degree of deterioration of the electrolyte, which may be the degree of change in the electrolyte due to the ingress of metal ions of the current collector into the electrolyte caused by corrosion of the current collector. Based on this, the degree of deterioration of the electrolyte can be determined by the internal resistance values of the electrolyte at the target electric quantity of the battery to be measured and the reference battery.
For example, the internal resistance value of the electrolyte of the reference battery at the target electric quantity may be set to be Re, the internal resistance value of the electrolyte of the battery to be measured at the target electric quantity may be set to be Re ', and the degree of deterioration of the electrolyte may be expressed by (Re' -Re)/Re. That is, the degree of deterioration of the battery electrolyte can be expressed as: the ratio of the change of the intrinsic internal resistance value of the electrode active material of the battery to be measured relative to the reference battery at the target electric quantity to the intrinsic internal resistance value of the electrode active material of the reference battery at the target electric quantity. When the degree of health of the electrolyte is inversely related to the degree of deterioration of the electrolyte, the degree of health of the electrolyte may be determined by means of 1- (Re' -Re)/Re.
Step 202: and determining the health degree of the electrode active material based on the intrinsic internal resistance values of the electrode active material of the battery to be tested and the reference battery in the target electric quantity. Here, the degree of health of the electrode active material is inversely related to the degree of deterioration of the electrode active material, and the degree of deterioration of the electrode active material may represent the degree of structural change of the electrode active material. Considering that the structural change degree of the electrode active material is related to the internal resistance of the electrode active material, the degradation degree of the electrode active material is determined by the intrinsic internal resistance value of the electrode active material of the battery to be tested and the reference battery at the target electric quantity;
For example, the intrinsic internal resistance value of the electrode active material of the reference battery at the target electric quantity may be set to Ra, the intrinsic internal resistance value of the electrode active material of the battery to be measured at the target electric quantity may be set to Ra ', and the degree of deterioration of the electrode active material may be expressed by (Ra' -Ra)/Ra. When the degree of health of the electrode active material is inversely related to the degree of deterioration of the electrode active material, the degree of health of the electrode active material may be determined by a method of 1- (Ra' -Ra)/Ra.
Step 203: and determining the health degree of the current collector based on the contact internal resistance value of the electrode active substances of the battery to be tested and the reference battery in the target electric quantity. Here, the health of the current collector is inversely related to the degree of deterioration of the current collector, and the degree of deterioration of the electrode active material may represent the degree of corrosion of the current collector. And considering that the corrosion degree of the current collector affects the contact internal resistance value of the electrode active material of the battery at the target electric quantity, the degradation degree of the current collector is determined by the contact internal resistance values of the electrode active material of the battery to be measured and the reference battery at the target electric quantity.
For example, the contact internal resistance value of the electrode active material of the reference battery at the target electric quantity may be set to Rs, the contact internal resistance value of the electrode active material of the battery to be measured at the target electric quantity may be set to Rs ', and the degree of deterioration of the current collector may be represented by (Rs' -Rs)/Rs. When the degree of health of the electrode active material is inversely related to the degree of deterioration of the electrode active material, the degree of health of the electrode active material may be determined by a method of 1- (Rs' -Rs)/Rs.
Step 204: and determining the health degree of the battery to be tested based on the health degree of the electrolyte, the health degree of the electrode active material and the health degree of the current collector.
According to the embodiment of the disclosure, when determining the health degree of the battery to be measured based on the health degree of the electrolyte, the health degree of the electrode active material and the health degree of the current collector, the health degree of the battery to be measured can be determined by a simple addition method, and also can be determined by a weighted addition method, and the weights of all parts can be set according to actual conditions, which is not repeated herein.
Fig. 3 shows a schematic diagram of an internal resistance measurement system of an exemplary embodiment of the present disclosure. As shown in fig. 3, the internal resistance measurement system 300 may connect the positive terminal of the ac signal generator 301 to the positive terminal of the battery 302, the negative terminal of the ac signal generator 301 to the negative terminal of the battery 302, and connect the voltmeter 303 between the positive terminal and the negative terminal of the battery 301 so that the battery 302 and the voltmeter 303 are in parallel connection, and connect the ammeter 304 between the negative terminal of the ac signal generator 301 and the negative terminal of the battery 301 so that the ammeter 304 and the battery 301 are connected in series on the ac signal generator.
As shown in fig. 3, the frequency of the ac voltage is set to be a high frequency fe, a medium frequency fa and a low frequency fs by the ac signal generator, the ac voltage is respectively supplied through the positive terminal and the negative terminal of the battery at these three frequencies, and corresponding current values are recorded, and then the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material can be determined by the mapping relationship of the current values and the internal resistance values.
The exemplary embodiment of the present disclosure may use a new battery as a reference battery, connect the new battery to a circuit shown in fig. 3 in a manner shown in fig. 3 after discharging 50% full power, measure a reference current value Ie corresponding to an ac voltage at a high frequency fe, a reference current value Ia corresponding to an ac voltage at a medium frequency fa, and a reference current value Is corresponding to an ac voltage at a low frequency fs, and then determine an electrolyte internal resistance value Re, an intrinsic internal resistance value Ra of an electrode active material, and a contact internal resistance value Rs of the electrode active material when the new battery Is discharged 50% through a mapping relationship between the current values and the internal resistance values.
On the basis, when a new battery Is used at the time T, the new battery becomes a battery to be measured, the battery to be measured Is fully charged and then discharged by 50%, the battery to be measured Is connected into a loop shown in fig. 3 in a manner shown in fig. 3, a current value Ie 'corresponding to the alternating voltage of the high-frequency fe, a current value Ia' corresponding to the alternating voltage of the medium-frequency fa and a current value Is 'corresponding to the alternating voltage of the low-frequency fs are measured, and then the electrolyte internal resistance Re', the intrinsic internal resistance Ra 'of the electrode active material and the contact internal resistance Rs' of the electrode active material when the battery to be measured Is discharged by 50% are determined through the mapping relation between the current values and the internal resistance.
Finally, the health degree of the battery to be tested is passedThe state of health SOH of the battery to be measured can be determined.
According to one or more technical schemes provided in the exemplary embodiments of the present disclosure, an internal resistance value of an electrolyte, an intrinsic internal resistance value of an electrode active material, and a contact internal resistance value of the electrode active material, which belong to the same type of battery to be measured and a reference battery in the same target electric quantity, may be obtained, where the internal resistance value of the electrolyte is related to a conductivity degree of the electrolyte, the intrinsic internal resistance value of the electrode active material may reflect a degree of change in a discharge structure of the electrode active material, and the contact internal resistance value of the electrode active material is a contact internal resistance of the electrode active material and a current collector, which may reflect a degree of corrosion of the current collector.
Therefore, the internal resistance value of the electrolyte of the to-be-measured battery and the reference battery in the target electric quantity, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material in the exemplary embodiment of the disclosure can reflect the influence of the electrolyte conductivity of the to-be-measured battery and the reference battery in the target electric quantity, the electrode active material discharging structure and the corrosion degree of the positive current collector on the internal resistance of the battery more accurately, so that the exemplary embodiment of the disclosure can accurately determine the health state of the to-be-measured battery based on the internal resistance value of the electrolyte of the to-be-measured battery and the reference battery in the target electric quantity, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the active material, thereby achieving accurate monitoring of the monitored state of the to-be-measured battery and reducing the probability of battery faults.
The frequencies of the excitation voltage related to the method of the exemplary embodiment of the present disclosure may be classified into low frequency, medium frequency, and high frequency, and are specifically set according to the structural characteristics of the battery. Tests prove that the lead-carbon battery charging and discharging scheme assisted by the method of the exemplary embodiment of the disclosure can ensure that the lead-carbon battery can circularly charge and discharge the 48V storage battery pack with 0.35-0.5C and 85% DOD at the running temperature of minus 15-50 ℃ and the number of times of the circular charging and discharging reaches more than 3000.
The embodiment of the disclosure may divide the functional units of the electronic device according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, in the embodiment of the present disclosure, the division of the modules is merely a logic function division, and other division manners may be implemented in actual practice.
In the case of dividing each functional module by corresponding each function, exemplary embodiments of the present disclosure provide a battery health detection apparatus, which may be an electronic device or a chip applied to the electronic device. Fig. 4 shows a functional block diagram of a battery health detection apparatus according to an exemplary embodiment of the present disclosure. As shown in fig. 4, the battery health detection apparatus 400 includes:
An obtaining module 401, configured to obtain an internal resistance value of an electrolyte, an intrinsic internal resistance value of an electrode active material, and a contact internal resistance value of an electrode active material of a to-be-measured battery and a reference battery in the same target electric quantity, where the to-be-measured battery and the reference battery belong to the same type of battery, and the contact internal resistance value of the electrode active material is the contact internal resistance of the electrode active material and a current collector;
a determining module 402, configured to determine a state of health of the battery to be tested based on the internal resistance value of the electrolyte of the battery to be tested and the reference battery at the target electric quantity, the intrinsic internal resistance value of the electrode active material, and the contact internal resistance value of the positive electrode active material.
In one possible implementation manner, the excitation voltage corresponding to the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material of the battery to be measured in the target electric quantity is the same, and the frequency band of the excitation voltage corresponding to the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material of the battery to be measured in the target electric quantity is gradually reduced.
In one possible implementation manner, the frequency band of the excitation voltage corresponding to the internal resistance value of the electrolyte of the battery to be measured at the target electric quantity, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material is determined by the electrochemical impedance spectrum of the battery to be measured at the target electric quantity.
In one possible implementation manner, the excitation voltage corresponding to the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material of the reference battery in the target electric quantity is the same, and the frequency band of the excitation voltage corresponding to the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material of the reference battery in the target electric quantity is gradually reduced.
In one possible implementation manner, the frequency band of the excitation voltage corresponding to the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material of the reference battery in the target electric quantity is determined by the electrochemical impedance spectrum of the battery to be measured in the target electric quantity.
In one possible implementation manner, the determining module 402 is configured to determine the health of the electrolyte based on the internal resistance values of the electrolyte of the to-be-measured battery and the reference battery at the target electric quantity, determine the health of the electrode active material based on the intrinsic internal resistance values of the electrode active material of the to-be-measured battery and the reference battery at the target electric quantity, determine the health of the current collector based on the contact internal resistance values of the electrode active material of the to-be-measured battery and the reference battery at the target electric quantity, and determine the health of the to-be-measured battery based on the health of the electrolyte, the health of the electrode active material and the health of the current collector.
In one possible implementation, the health of the electrolyte is inversely related to the degree of degradation of the electrolyte, which is determined by the internal resistance values of the electrolyte of the battery under test and the reference battery at the target electrical quantity;
the health degree of the electrode active material is inversely related to the degradation degree of the electrode active material, and the degradation degree of the electrode active material is determined by the intrinsic internal resistance value of the electrode active material of the battery to be tested and the reference battery at the target electric quantity;
the health of the current collector is inversely related to the degradation degree of the current collector, and the degradation degree of the current collector is determined by the contact internal resistance value of the electrode active substances of the battery to be tested and the reference battery at the target electric quantity.
In one possible implementation manner, the accumulated use time length of the reference battery is smaller than a preset time length, and the accumulated use time length of the battery to be tested is longer than the accumulated use time length of the reference battery.
Fig. 5 shows a schematic block diagram of a chip according to an exemplary embodiment of the present disclosure. As shown in fig. 5, the chip 500 includes one or more (including two) processors 501 and a communication interface 502. The communication interface 502 may support the electronic device to perform the data transceiving steps of the method described above, and the processor 501 may support the electronic device to perform the data processing steps of the method described above.
Optionally, as shown in fig. 5, the chip 500 further includes a memory 503, where the memory 503 may include a read-only memory and a random access memory, and provides operating instructions and data to the processor. A portion of the memory may also include non-volatile random access memory (non-volatile random access memory, NVRAM).
In some embodiments, as shown in fig. 5, the processor 501 performs the corresponding operation by invoking a memory-stored operating instruction (which may be stored in an operating system). The processor 501 controls the processing operations of any one of the terminal devices, and may also be referred to as a central processing unit (central processing unit, CPU). Memory 903 may include read only memory and random access memory and provides instructions and data to processor 501. A portion of the memory 903 may also include NVRAM. Such as a memory, a communication interface, and a memory coupled together by a bus system that may include a power bus, a control bus, a status signal bus, etc., in addition to a data bus. But for clarity of illustration, the various buses are labeled as bus system 504 in fig. 5.
The method disclosed by the embodiment of the disclosure can be applied to a processor or implemented by the processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The processor may be a general purpose processor, a digital signal processor (digital signal processing, DSP), an ASIC, an off-the-shelf programmable gate array (field-programmable gate array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The various methods, steps and logic blocks of the disclosure in the embodiments of the disclosure may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present disclosure may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.
The exemplary embodiments of the present disclosure also provide an electronic device including: at least one processor; and a memory communicatively coupled to the at least one processor. The memory stores a computer program executable by the at least one processor for causing the electronic device to perform a method according to embodiments of the present disclosure when executed by the at least one processor.
The present disclosure also provides a non-transitory computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor of a computer, is for causing the computer to perform a method according to an embodiment of the present disclosure.
The present disclosure also provides a computer program product comprising a computer program, wherein the computer program, when executed by a processor of a computer, is for causing the computer to perform a method according to embodiments of the disclosure.
Referring to fig. 6, a block diagram of an electronic device 600 that may be a server or a client of the present disclosure, which is an example of a hardware device that may be applied to aspects of the present disclosure, will now be described. Electronic devices are intended to represent various forms of digital electronic computer devices, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the disclosure described and/or claimed herein.
As shown in fig. 6, the electronic device 600 includes a computing unit 601 that can perform various appropriate actions and processes according to a computer program stored in a Read Only Memory (ROM) 602 or a computer program loaded from a storage unit 608 into a Random Access Memory (RAM) 603. In the RAM 603, various programs and data required for the operation of the device 600 may also be stored. The computing unit 601, ROM 602, and RAM 603 are connected to each other by a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.
As shown in fig. 6, various components in the electronic device 600 are connected to the I/O interface 605, including: an input unit 606, an output unit 607, a storage unit 608, and a communication unit 609. The input unit 606 may be any type of device capable of inputting information to the electronic device 600, and the input unit 606 may receive input numeric or character information and generate key signal inputs related to user settings and/or function controls of the electronic device. The output unit 607 may be any type of device capable of presenting information and may include, but is not limited to, a display, speakers, video/audio output terminals, vibrators, and/or printers. Storage unit 608 may include, but is not limited to, magnetic disks, optical disks. The communication unit 609 allows the electronic device 600 to exchange information/data with other devices through a computer network, such as the internet, and/or various telecommunications networks, and may include, but is not limited to, modems, network cards, infrared communication devices, wireless communication transceivers and/or chipsets, such as bluetooth (TM) devices, wiFi devices, wiMax devices, cellular communication devices, and/or the like.
As shown in fig. 6, the computing unit 601 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of computing unit 601 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various computing units running machine learning model algorithms, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 601 performs the various methods and processes described above. For example, in some embodiments, the methods described by the exemplary embodiments of the present disclosure may be implemented as a computer software program tangibly embodied on a machine-readable medium, such as storage unit 608. In some embodiments, part or all of the computer program may be loaded and/or installed onto the electronic device 600 via the ROM 602 and/or the communication unit 609. In some embodiments, the computing unit 601 may be configured to perform the exemplary embodiment methods of the present disclosure by any other suitable means (e.g., by means of firmware).
Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program code may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus such that the program code, when executed by the processor or controller, causes the functions/operations specified in the flowchart and/or block diagram to be implemented. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and pointing device (e.g., a mouse or trackball) by which a user can provide input to the computer. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), and the internet.
The computer system may include a client and a server. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described by the embodiments of the present disclosure are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a terminal, a user equipment, or other programmable apparatus. The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired or wireless means. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, e.g., floppy disk, hard disk, tape; optical media, such as digital video discs (digital video disc, DVD); but also semiconductor media such as solid state disks (solid state drive, SSD).
Although the present disclosure has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations thereof can be made without departing from the spirit and scope of the disclosure. Accordingly, the specification and drawings are merely exemplary illustrations of the present disclosure as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the disclosure. It will be apparent to those skilled in the art that various modifications and variations can be made to the present disclosure without departing from the spirit or scope of the disclosure. Thus, the present disclosure is intended to include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (11)
1. A method for detecting battery health, the method comprising:
the method comprises the steps of obtaining an electrolyte internal resistance value of a battery to be tested and a reference battery in the same target electric quantity, an intrinsic internal resistance value of an electrode active material and a contact internal resistance value of the electrode active material, wherein the battery to be tested and the reference battery belong to the same type of battery, and the contact internal resistance value of the electrode active material is the contact internal resistance of the electrode active material and a current collector;
And determining the health state of the battery to be tested based on the internal resistance value of the electrolyte of the battery to be tested and the reference battery in the target electric quantity, the intrinsic internal resistance value of the electrode active substance and the contact internal resistance value of the positive electrode active substance.
2. The method according to claim 1, wherein the excitation voltages corresponding to the internal resistance value of the electrolyte, the intrinsic resistance value of the electrode active material and the contact internal resistance value of the electrode active material of the battery to be measured in the target electric quantity are the same, and the frequency band of the excitation voltages corresponding to the internal resistance value of the electrolyte, the intrinsic resistance value of the electrode active material and the contact internal resistance value of the electrode active material of the battery to be measured in the target electric quantity is gradually reduced.
3. The method according to claim 2, wherein the frequency band of the excitation voltage corresponding to the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material of the battery to be measured in the target electric quantity is determined by the electrochemical impedance spectrum of the battery to be measured in the target electric quantity.
4. The method according to claim 1, wherein the excitation voltages corresponding to the internal resistance value of the electrolyte, the intrinsic resistance value of the electrode active material, and the contact internal resistance value of the electrode active material of the reference battery at the target electric quantity are the same, and the frequency band of the excitation voltages corresponding to the internal resistance value of the electrolyte, the intrinsic resistance value of the electrode active material, and the contact internal resistance value of the electrode active material of the reference battery at the target electric quantity is gradually decreased.
5. The method according to claim 2, wherein the frequency band of the excitation voltage corresponding to the internal resistance value of the electrolyte, the intrinsic internal resistance value of the electrode active material and the contact internal resistance value of the electrode active material of the reference battery in the target electric quantity is determined by the electrochemical impedance spectrum of the battery to be measured in the target electric quantity.
6. The method according to claim 1, wherein the determining the state of health of the battery to be measured based on the internal resistance value of the electrolyte of the battery to be measured and the reference battery at the target electric quantity, the intrinsic internal resistance value of the electrode active material, and the contact internal resistance value of the positive electrode active material, comprises:
determining the health degree of the electrolyte based on the internal resistance value of the electrolyte of the battery to be detected and the reference battery in the target electric quantity;
determining the health degree of the electrode active material based on the intrinsic internal resistance values of the electrode active material of the battery to be detected and the reference battery in the target electric quantity;
determining the health degree of the current collector based on the contact internal resistance value of the electrode active substances of the battery to be detected and the reference battery in the target electric quantity;
and determining the health degree of the battery to be tested based on the health degree of the electrolyte, the health degree of the electrode active material and the health degree of the current collector.
7. The method according to claim 6, wherein the degree of health of the electrolyte is inversely related to the degree of deterioration of the electrolyte, the degree of deterioration of the electrolyte being determined by the internal electrolyte resistance values of the battery to be measured and the reference battery at the target electric quantity;
the health degree of the electrode active material is inversely related to the degradation degree of the electrode active material, and the degradation degree of the electrode active material is determined by the intrinsic internal resistance value of the electrode active material of the battery to be tested and the reference battery at the target electric quantity;
the health of the current collector is inversely related to the degradation degree of the current collector, and the degradation degree of the current collector is determined by the contact internal resistance value of the electrode active substances of the battery to be tested and the reference battery at the target electric quantity.
8. The method of any one of claims 1 to 7, wherein the reference battery has a cumulative usage time period that is less than a preset time period, and the battery to be measured has a cumulative usage time period that is greater than the reference battery.
9. A battery health degree detection device, characterized by comprising:
the device comprises an acquisition module, a control module and a control module, wherein the acquisition module is used for acquiring the internal resistance value of electrolyte of a battery to be tested and a reference battery in the same target electric quantity, the intrinsic internal resistance value of an electrode active substance and the contact internal resistance value of the electrode active substance, the battery to be tested and the reference battery belong to the same type of battery, and the contact internal resistance value of the electrode active substance is the contact internal resistance of the electrode active substance and a current collector;
And the determining module is used for determining the health state of the battery to be tested based on the internal resistance value of the electrolyte of the battery to be tested and the reference battery in the target electric quantity, the intrinsic internal resistance value of the electrode active substance and the contact internal resistance value of the positive electrode active substance.
10. An electronic device, comprising:
a processor; the method comprises the steps of,
a memory storing a program;
wherein the program comprises instructions which, when executed by the processor, cause the processor to perform the method according to any one of claims 1 to 8.
11. A non-transitory computer readable storage medium storing computer instructions for causing a computer to perform the method of any one of claims 1-8.
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