CN113504480A - Direct-current internal resistance detection method of lithium ion power storage battery - Google Patents
Direct-current internal resistance detection method of lithium ion power storage battery Download PDFInfo
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 220
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 220
- 238000003860 storage Methods 0.000 title claims abstract description 195
- 238000001514 detection method Methods 0.000 title claims abstract description 59
- 208000028659 discharge Diseases 0.000 claims abstract description 114
- 238000000034 method Methods 0.000 claims abstract description 67
- 238000007599 discharging Methods 0.000 claims abstract description 50
- 230000008569 process Effects 0.000 claims abstract description 41
- 239000000178 monomer Substances 0.000 claims description 19
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 5
- 238000011895 specific detection Methods 0.000 description 17
- 238000007726 management method Methods 0.000 description 14
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- 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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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
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Abstract
The application discloses a direct current internal resistance detection method of a lithium ion power storage battery, which comprises the following steps: determining a target discharge capacity value for the lithium ion power storage battery; performing discharge treatment on the lithium ion power storage battery according to preset discharge conditions and the target discharge capacity value; in the discharging process, collecting the voltage of the lithium ion power storage battery according to a preset voltage collecting frequency; and determining the direct current internal resistance of the lithium ion power storage battery based on the acquired voltage. By the adoption of the method and the device, direct current internal resistance of the lithium ion power storage battery can be detected, quality of the lithium ion power storage battery is identified and evaluated, accuracy of quality and safety condition judgment of the lithium ion power storage battery is improved, and safety and usability of the new energy automobile are improved.
Description
Technical Field
The application relates to the technical field of new energy, in particular to a direct current internal resistance detection method of a lithium ion power storage battery.
Background
According to statistics, from 2012 to 2017, the annual production and sales of new energy automobiles are increased from 1 ten thousand to more than 60 ten thousand, the retention amount exceeds the critical point of 1%, the first world is formed by exceeding Japan and America, the industry finishes the lead-in period, and the industry steadily enters the growth period. And various development planning related documents are continuously provided in China, so that new energy automobiles gradually become the future key development field of the automobile industry in China.
And the lithium ion power storage battery products are finally applied to the fields of new energy automobile power and energy storage. However, the development of lithium ion power storage batteries in the field of new energy automobiles faces safety challenges: on one hand, the lithium ion power storage battery is short-circuited and burnt and exploded due to improper use method of a user; on the other hand, lithium ions of the lithium ion power storage battery are active in chemical property, and are easy to explode and combust once high temperature occurs under the coordination of a graphite cathode. The combustion and explosion of the lithium ion power storage battery in use can bring personal and property threats to users of new energy automobiles.
Therefore, the direct current internal resistance and other parameters/indexes of the lithium ion power storage battery of the new energy automobile are detected, the quality of the lithium ion power storage battery can be identified and evaluated, and the quality and safety condition judgment accuracy of the lithium ion power storage battery is improved.
Disclosure of Invention
The present application is proposed to solve the above-mentioned technical problems. The embodiment of the application provides a direct current internal resistance detection method of a lithium ion power storage battery.
According to one aspect of the application, a method for detecting direct current internal resistance of a lithium ion power storage battery is provided, wherein the lithium ion power storage battery comprises more than one single battery cell, and the method comprises the following steps:
determining a target discharge capacity value for the lithium ion power storage battery;
performing discharge treatment on the lithium ion power storage battery according to preset discharge conditions and the target discharge capacity value;
in the discharging process, collecting the voltage of the lithium ion power storage battery according to a preset voltage collecting frequency;
and determining the direct current internal resistance of the lithium ion power storage battery based on the acquired voltage.
In some embodiments, prior to the determining the target discharge capacity value for the lithium-ion power battery, the method further comprises:
determining an available capacity of the lithium ion power storage battery;
the determining a target discharge capacity value for the lithium-ion power battery comprises:
determining a target discharge capacity value for the lithium-ion power battery as a function of available capacity of the lithium-ion power battery.
In some embodiments, said determining a target discharge capacity value for said lithium ion power battery as a function of available capacity of said lithium ion power battery comprises:
determining a target discharge capacity value for the lithium ion power battery by:
cd 50% Ct ternary lithium/73% lithium iron phosphate,
the Cd is a target discharge capacity value of the lithium ion power storage battery, and the Ct is an available capacity of the lithium ion power storage battery.
In some embodiments, the discharging the lithium-ion power storage battery according to the preset discharging condition and the target discharging capacity value includes:
and under the condition that the lithium ion power storage battery is in a charge cut-off state, discharging the lithium ion power storage battery to the target discharge capacity value for the first time according to 1C.
In some embodiments, the discharging the lithium-ion power storage battery according to the preset discharging condition and the target discharging capacity value includes:
and discharging the lithium ion power storage battery for the first time to the target discharge capacity value according to a preset discharge constraint condition of the lithium ion power storage battery, wherein the preset discharge constraint condition is preset by a manufacturer of the lithium ion power storage battery.
In some embodiments, the method further comprises:
performing power-off standing treatment on the lithium ion power storage battery subjected to the primary discharge treatment for a first preset time, wherein the first preset time is 10 minutes, 15 minutes, 30 minutes or 60 minutes;
and performing secondary discharge treatment on the lithium ion power storage battery subjected to outage and standing treatment.
In some embodiments, the secondary discharge treatment of the lithium ion power storage battery subjected to the power-off standing treatment includes:
and discharging the lithium ion power storage battery according to the 1C for a second preset time, wherein the second preset time is 10 seconds, 15 seconds, 30 seconds or 60 seconds.
In some embodiments, the collecting the voltage of the lithium ion power storage battery according to a preset voltage collecting frequency during the discharging process includes:
collecting the initial discharge voltage and the final discharge voltage of the lithium ion power storage battery in the discharge process;
alternatively, the first and second electrodes may be,
in the discharging process, the cell voltage of each cell of the lithium ion power storage battery is acquired according to a first preset time difference, and the range of the first preset time difference is between 0 millisecond and 100 milliseconds.
In some embodiments, the collected cell voltages of the lithium ion power storage battery are sent to a direct current charging grid according to a second preset time difference, and the second preset time difference is between 0 second and 1 second.
In some embodiments, the determining the internal dc resistance of the lithium ion power battery based on the collected voltage comprises:
according to the initial discharge voltage and the final discharge voltage of the lithium ion power storage battery, determining the total direct current internal resistance value of the lithium ion power storage battery according to the following formula:
Rgeneral assembly＝(V1-V2)/I，
Wherein R isGeneral assemblyIs the total DC internal resistance value, V, of the lithium ion power storage battery1Is the discharge initial voltage, V, of the lithium ion power storage battery2For the discharge of said lithium-ion power accumulatorElectrical termination voltage, I is 1C;
alternatively, the first and second electrodes may be,
according to the monomer voltage of the lithium ion power storage battery, determining the monomer direct current internal resistance of each monomer battery cell of the lithium ion power storage battery according to the following formula:
Rn＝(V1n-V2n)/I
wherein R isnIs the monomer direct current internal resistance, V, of the monomer cell with the serial number n of the lithium ion power storage battery1nThe voltage of the last frame of the single battery cell with the serial number n before secondary discharge of the lithium ion power storage battery is V2nAnd the voltage of the single battery cell with the serial number n at the end of secondary discharge of the lithium ion power storage battery is obtained.
The embodiment of the application provides a method for detecting the direct current internal resistance of a lithium ion power storage battery of a new energy automobile, and the method can be used for detecting the direct current internal resistance of the lithium ion power storage battery, so that the quality of the lithium ion power storage battery is identified and evaluated, the accuracy of judging the quality and the safety condition of the lithium ion power storage battery is favorably improved, and the safety and the usability of the new energy automobile are improved.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in more detail embodiments of the present application with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings, like reference numbers generally represent like parts or steps.
Fig. 1 is a schematic diagram of detection connection of a lithium-ion power storage battery provided in an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a detection system of a lithium-ion power storage battery according to an embodiment of the present application.
Fig. 3 is a schematic flow chart of a method for detecting direct current internal resistance of a lithium ion power storage battery according to an embodiment of the present application.
Detailed Description
Hereinafter, example embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be understood that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and that the present application is not limited by the example embodiments described herein.
Fig. 1 is a schematic diagram of detection connection of a lithium-ion power storage battery provided in an embodiment of the present application.
As shown in fig. 1, a is a lithium ion power storage BATTERY, which includes a plurality of or at least one cell, B is a BATTERY management system (BATTERY MANAGEMENT SYSTEM, BMS), and C is a detection device. The BMS can also be called a battery caregiver or a battery manager, and is mainly used for intelligently managing and maintaining each battery unit, preventing the battery from being overcharged and overdischarged, prolonging the service life of the battery and monitoring the state of the battery, in addition, after the BMS opens the function of discharging the electric vehicle by using a direct current charging port, after a detection process is started, information of charging/discharging state guidance, maximum allowable discharging current, minimum cell voltage, cell minimum allowable voltage and the like which are continuously output contents are added in a charging network, through the information, the detection equipment can safely charge/discharge the vehicle, and the information interaction quantity of the BMS and a detection module in a direct current charging network is increased, after the detection process is confirmed, the BMS sends statistical information including the use of the lithium ion power storage battery, the use information of the lithium ion power storage battery, the charge power supply and the detection module in the direct current charging network, And all the monomer voltage information and the like are utilized by the detection equipment to calculate and output the state parameters of the lithium ion power storage battery by utilizing the information and the information which is interacted with the direct current charging.
In this application embodiment, in order to promote convenience and precision of lithium ion power battery, check out test set can satisfy following requirement: the lithium ion power storage battery charging system is provided with a bidirectional isolation DC-DC module, and an energy storage system with 90kWh electric quantity is configured at a direct current end so as to safely fully charge and discharge the lithium ion power storage battery; secondly, the flow and parameter control of the detection equipment are controlled in a programmable mode, full charge and fixed SOC discharge are carried out on the vehicle lithium ion power storage battery according to the BMS control current and voltage requirements, meanwhile, in the charging and discharging processes, a fixed SOC value is obtained, pulse current with a fixed time length is output, and preparation for obtaining direct current internal resistance information is carried out; and thirdly, the detection equipment has the detection precision of the current and the voltage (plus or minus 0.1% rdg. + orminus 0.1% f.s.) of the direct-current end of the lithium ion power storage battery, and the data such as output capacity, internal resistance, voltage difference and the like are calculated through the acquired data.
In general, the detection device in the embodiment of the present application may have the following conditions: the device at least has a direct current charging function and a direct current discharging function; the detection precision meets the following requirements: the measurement error of the output current is not more than +/-0.1% FS; the measurement error of the output voltage does not exceed +/-0.1% FS; temperature measurement error does not exceed
Plus or minus 0.5 ℃; the time measurement error is not more than +/-0.1 s; the precision requirement of insulation test equipment is as follows: 5 percent.
The lithium-ion power accumulator is usually mounted in its carrier vehicle, which is not shown in this figure, mainly to show the connection situation and the devices or equipment involved in the test.
On the basis of the connection, the following describes the detection system of the lithium-ion power storage battery provided by the present application in detail.
Fig. 2 is a schematic structural diagram of a detection system of a lithium-ion power storage battery according to an embodiment of the present application.
As shown in fig. 2, the detection system for a lithium-ion power storage battery provided in the embodiment of the present application, the lithium-ion power storage battery includes more than one unit cell, the system is configured to detect a state parameter of the lithium-ion power storage battery, and may include a specific detection device 21 and a battery management system BMS22, and the specific detection device 21 is communicatively connected to a battery management system BMS 22.
The specific detection device 21 comprises a first detection module 211, a communication module 212, a bidirectional isolation DC-DC module 213 and an energy storage module 214, wherein the bidirectional isolation DC-DC module 213 and the energy storage module 214 are used for charging the lithium ion power storage battery, and the first detection module 211 is used for determining a detection state parameter of the lithium ion power storage battery.
The battery management system BMS22 includes a discharging module 221, an instruction module 222, a data transmission module 223, and a second detection module 224, wherein the discharging module 221 is configured to discharge the lithium ion power storage battery through a dc charging port, the instruction module 222 is configured to send instruction information to the specific detection device, the second detection module 224 is configured to detect an initial state parameter of the lithium ion power storage battery, and the data transmission module 223 is configured to send the detected initial state parameter to the specific detection module.
Based on the detection system and the structure of the detection system, the application provides a direct current internal resistance detection method of a lithium ion power storage battery. Fig. 3 is a schematic flow chart of a method for detecting direct current internal resistance of a lithium ion power storage battery according to an embodiment of the present application.
As shown in fig. 3, a method for detecting the direct current internal resistance of a lithium ion power storage battery includes the following steps:
The available capacity of the lithium ion power storage battery may be determined prior to determining the target discharge capacity value. For example, determining the available capacity of a lithium ion power battery may be performed by:
processing the lithium ion power storage battery according to a first preset condition to determine the accumulated capacity of the lithium ion power storage battery, wherein the accumulated capacity is the sum of the capacities of all single battery cells of the lithium ion power storage battery.
For example, the lithium-ion power storage battery may be subjected to a discharge treatment according to a first preset discharge condition, for example, the lithium-ion power storage battery is subjected to a discharge treatment according to a 1C discharge manner, or the lithium-ion power storage battery is discharged to a preset discharge cutoff condition according to a preset constraint discharge condition, where the preset discharge constraint condition and the preset cutoff condition are both labeled when the lithium-ion power storage battery is shipped from a factory.
In some embodiments, the discharge process may be, for example, discharging the lithium ion power storage battery by a specific detection device (i.e., detection device C shown in fig. 1): when the specific detection equipment receives discharge termination information of a preset battery management system and/or the specific detection equipment detects that the highest voltage value and the lowest voltage value exceed the voltage protection range in the discharge process, stopping discharging the lithium ion power storage battery; and recording the discharge end time. Wherein the preset discharge cut-off condition is that the vehicle SOC value of the carrier of the lithium-ion power storage battery is adjusted to be less than 30%.
And after the discharging treatment is finished, further performing charging treatment on the lithium ion power storage battery after the discharging treatment so as to obtain the accumulated capacity of the lithium ion power storage battery when the first preset charging condition is reached, wherein the accumulated capacity is the sum of the capacities of all the single battery cells of the lithium ion power storage battery.
Further, the lithium ion power storage battery after discharge treatment can be subjected to power-off standing treatment; and under the condition that the power-off standing treatment reaches a preset cut-off time (for example, 10 minutes, 15 minutes or 30 minutes), charging the lithium ion power storage battery to a preset charge cut-off condition according to a preset charge constraint condition to obtain the accumulated capacity of the lithium ion power storage battery. The preset charging constraint condition may be a maximum allowable charging current set by a preset battery management system, that is, the lithium ion power storage battery is charged by the maximum allowable charging current, and in some embodiments, the time for starting charging may be marked; the preset charge cut-off condition may be, for example, a preset battery management system, that is, the preset battery management system sends charge termination information to the detection device, so as to control the specific detection device to stop charging the lithium ion power storage battery, or the preset battery management system sends charge termination information to the detection device, and when the specific detection device detects that the maximum voltage value and the minimum voltage value in the discharging process exceed the voltage protection range, the specific detection device stops charging the lithium ion power storage battery. The voltage protection range may be set or marked when the lithium ion power storage battery leaves a factory, the ranges of different lithium ion power storage batteries may be inconsistent, and the voltage protection ranges may also be inconsistent.
In this embodiment of the application, the voltage protection range may be set in a specific detection device, and the specific detection device compares the detected voltage value with the voltage protection range in the detection process, or the voltage protection range may be set in a preset battery management system, and the specific detection device sends the detected voltage value to the preset battery management system for comparison, and if the voltage protection range is exceeded, the specific detection device sends the charging termination information.
In some embodiments, determining the cumulative capacity of the lithium ion power storage battery may also be accomplished, for example, by:
step 1, performing power-off standing treatment on the lithium ion power storage battery after the discharging treatment;
step 2, charging the lithium ion power storage battery by using specific detection equipment under the condition that the power-off standing treatment reaches a preset cut-off time;
step 3, aiming at the lithium ion power storage battery in a charging state, acquiring the charging capacity of the lithium ion power storage battery when the SOC value of a carrier vehicle of the lithium ion power storage battery is between a first threshold and a second threshold, wherein the first threshold is smaller than the second threshold, the difference value between the second threshold and the first threshold is more than or equal to 5%, and the dereferencing of the first threshold and the second threshold is between 30% and 60%;
after the charging reaches a first preset charging condition, determining and obtaining the accumulated capacity of the lithium ion power storage battery according to the following formula:
wherein, X2Is the second threshold value, X1Is the first threshold value, C1The charging capacity of the lithium-ion power storage battery is determined when the first threshold value is the SOC value of the carrier vehicle of the lithium-ion power storage battery between the first threshold value and a second threshold value.
In other embodiments, determining the cumulative capacity of the lithium-ion power storage battery may also be accomplished, for example, by:
step 1, recording the current value of the lithium ion power storage battery at any moment before a first preset charging condition is reached in the process of charging the lithium ion power storage battery after discharging treatment;
step 2, based on the current value and the charging time of the lithium ion power storage battery at any moment, determining the accumulated capacity of the lithium ion power storage battery according to the following formula:
wherein I is the current value of the lithium ion power storage battery at any moment, t is time, CtAnd the accumulated capacity of the lithium ion power storage battery is obtained.
In turn, a target discharge capacity value for the lithium-ion power battery is determined from the available capacity of the lithium-ion power battery, which in some embodiments may be determined by the following equation:
Cd＝Ct50% of ternary lithium/73% of lithium iron phosphate,
wherein, the CdIs a target discharge capacity value of a lithium ion power storage battery, CtIs the available capacity of the lithium ion power storage battery.
And 302, performing discharge treatment on the lithium ion power storage battery according to preset discharge conditions and the target discharge capacity value.
The preset discharge condition may be preset by a manufacturer of the lithium-ion power storage battery during production or shipment, or may also be preset by a preset battery management system in the foregoing system. In some embodiments, this step may be implemented as: and under the condition that the lithium ion power storage battery is in a charge cut-off state, discharging the lithium ion power storage battery to the target discharge capacity value for the first time according to 1C. In other embodiments, this step may also be implemented as: and v, discharging the lithium ion power storage battery for the first time to the target discharge capacity value according to a preset discharge constraint condition of the lithium ion power storage battery, wherein the preset discharge constraint condition is preset by a manufacturer of the lithium ion power storage battery.
In some embodiments, the lithium ion power storage battery after the first discharge treatment is subjected to a power-off standing treatment for a first preset time, wherein the first preset time is 10 minutes, 15 minutes, 30 minutes or 60 minutes; and performing secondary discharge treatment on the lithium ion power storage battery subjected to the outage standing treatment. Further, the secondary discharge treatment may be, for example, discharging the lithium-ion power storage battery at 1C for a second preset time, the second preset time being 10 seconds, 15 seconds, 30 seconds, or 60 seconds.
And 303, collecting the voltage of the lithium ion power storage battery according to a preset voltage collection frequency in the discharging process.
In some embodiments, during a discharge process, collecting a discharge initiation voltage and a discharge termination voltage of the lithium ion power storage battery;
alternatively, the first and second electrodes may be,
in the discharging process, the cell voltage of each cell of the lithium ion power storage battery is acquired according to a first preset time difference, and the range of the first preset time difference is between 0 millisecond and 100 milliseconds.
Further, after the voltage is collected, the collected monomer voltage of the lithium ion power storage battery can be sent to a direct current charging grid according to a second preset time difference, and the second preset time difference is between 0 second and 1 second. For example, the preset battery management system transmits the voltage information to the specific detection device through the charging grid or the like according to the second preset time difference.
And 304, determining the direct current internal resistance of the lithium ion power storage battery based on the acquired voltage.
The embodiment of the application can determine the total direct current internal resistance of the lithium ion power storage battery and also determine the single direct current internal resistance of each single battery cell of the lithium ion power storage battery.
In some embodiments, the total dc internal resistance of the lithium ion power storage battery is determined according to the following formula according to the initial discharge voltage and the final discharge voltage of the lithium ion power storage battery:
Rgeneral assembly＝(V1-V2)/I，
Wherein R isGeneral assemblyIs the total DC internal resistance value, V, of the lithium ion power storage battery1Is the discharge initial voltage, V, of the lithium ion power storage battery2And I is the discharge termination voltage of the lithium ion power storage battery and is 1C. ,
in other embodiments, according to the cell voltage of the lithium-ion power storage battery, the cell direct current internal resistance of each cell of the lithium-ion power storage battery is determined according to the following formula:
Rn＝(V1n-V2n)/I
wherein R isnIs the monomer direct current internal resistance, V, of the monomer cell with the serial number n of the lithium ion power storage battery1nThe voltage of the last frame of the single battery cell with the serial number n before secondary discharge of the lithium ion power storage battery is V2nAnd the voltage of the single battery cell with the serial number n at the end of secondary discharge of the lithium ion power storage battery is obtained.
Based on the foregoing embodiments, the following summarizes the cell capacity detection process of the lithium-ion power battery according to the embodiments of the present application: (it should be noted that the following processes are in order, the influence of the battery temperature factor on the detection is not considered, the default is that the lithium ion power storage battery has a liquid cooling function, the temperature of the battery lithium ion power storage battery can be controlled within 35 ℃, and the detected ambient temperature is within +/-5 ℃):
the first, mode, parameter setting process:
a) setting a mode as a detection mode;
b) setting a discharge current to transmit an allowable value according to the BMS;
c) setting the type of the lithium ion power storage battery as ternary lithium/lithium iron phosphate/other types;
d) setting the lowest/highest single body (single cell) voltage protection of the lithium ion power storage battery;
e) setting a direct current internal resistance detection pulse discharge current value of the system;
f) setting a single (single-cell) direct-current internal resistance detection pulse discharge current value;
g) the equipment continuously records the single voltage, total voltage, current, SOC and temperature sampling point information of the power battery sent by the BMS, and stores original data according to BMS numbering rules.
Second, discharge process:
a) a discharge current execution strategy allows a discharge current according to the maximum BMS;
b) the discharge cut-off signal (preset discharge cut-off condition) is derived from BMS active stop information, meanwhile, the detection equipment monitors the highest and lowest voltage signals of the lithium ion power storage battery, and when the highest and lowest voltage signals exceed the protection voltage range, the detection equipment actively stops the discharge process and quits the detection process;
c) marking the discharge end time point.
Thirdly, standing: standing requirement and standing time
a) Stopping the output current of the equipment by a BMS discharge stopping signal;
b) the BMS controls the disconnection of the lithium ion power storage battery contactor;
c) and (5) timing 15min I to be 0, marking a time point after the standing is finished, and calling the voltage information of the lithium ion power storage battery monomer at the time point.
Fourth, charging process:
a) the detection equipment and the BMS are interacted to enter a charging process, and the BMS attracts a contactor to prepare for charging;
b) the charging current is controlled according to the maximum allowable charging current sent by the BMS;
c) marking a starting charging time point;
d) the charge stopping signal is derived from BMS active stopping information, meanwhile, the detection equipment monitors the highest and lowest voltage signals of the lithium ion power storage battery, and when the highest and lowest voltage signals exceed the protection voltage range, the detection equipment actively stops the charging process and quits the detection process;
e) in the charging process, the equipment performs integral calculation on the charging capacity according to the accurately acquired current, and synchronously stores the charging capacity and other information according to one frame of data per second;
f) marking a charging end time point.
Fifthly, standing:
a) with the BMS charge stop signal, the device stops outputting current;
b) the BMS controls the disconnection of the lithium ion power storage battery contactor;
c) timing 15min I to be 0, marking a time point fifthly after standing is finished, and calling the voltage information of the power battery monomer at the time point;
d) calculating the target discharge capacity of the next charging and discharging process according to Cd (system charge capacity) 50% _ ternary lithium/73% _ lithium iron phosphate (the specific proportion is set in advance according to the test requirement) in the standing process;
e) and simultaneously, the detection equipment/BMS interface displays the result information such as the capacity, the voltage precision, the current precision, the SOC precision, the charging temperature rise and the like obtained in the previous step.
Sixth, discharge process:
a) the detection equipment and the BMS are interacted to enter a discharging process, and the BMS attracts a contactor to prepare for discharging;
b) performing a discharging process according to a maximum allowable discharging current transmitted from the BMS;
c) during the discharging process, the device carries out integration recording on the discharging capacity according to the accurately collected current, and the discharging process is stopped when the discharging capacity reaches Cd;
d) the detection equipment monitors the highest and lowest voltage signals of the battery, and when the highest and lowest voltage signals exceed the protection voltage range, the detection equipment actively stops the discharging process and quits the detection process.
Seventhly, detecting the system internal resistance:
a) the detection equipment detects current output current according to the set system internal resistance;
b) recording the time point of starting to output current;
c) continuously outputting current I10s, and recording the current output ending time point;
d) and the detection equipment calculates the direct current internal resistance of the system according to the voltage and current information acquired by the port direct current charging port.
Eighth, monomer internal resistance detection process:
a) the detection equipment detects current output current according to the set monomer internal resistance;
b) recording the time point of starting to output current;
c) continuously outputting the current I30 s, and recording the current output ending time point;
d) and the detection equipment calculates the direct current internal resistance of the single battery according to the BMS single battery voltage information received in real time, the marked time point and the current acquired by the detection equipment.
The embodiment of the application provides a method for detecting the direct current internal resistance of a lithium ion power storage battery of a new energy automobile, and the method can be used for detecting the direct current internal resistance of the lithium ion power storage battery, so that the quality of the lithium ion power storage battery is identified and evaluated, the accuracy of judging the quality and the safety condition of the lithium ion power storage battery is favorably improved, and the safety and the usability of the new energy automobile are improved.
The foregoing describes the general principles of the present application in conjunction with specific embodiments, however, it is noted that the advantages, effects, etc. mentioned in the present application are merely examples and are not limiting, and they should not be considered essential to the various embodiments of the present application. Furthermore, the foregoing disclosure of specific details is for the purpose of illustration and description and is not intended to be limiting, since the foregoing disclosure is not intended to be exhaustive or to limit the disclosure to the precise details disclosed.
The block diagrams of devices, apparatuses, systems referred to in this application are only given as illustrative examples and are not intended to require or imply that the connections, arrangements, configurations, etc. must be made in the manner shown in the block diagrams. These devices, apparatuses, devices, systems may be connected, arranged, configured in any manner, as will be appreciated by those skilled in the art. Words such as "including," "comprising," "having," and the like are open-ended words that mean "including, but not limited to," and are used interchangeably therewith. The words "or" and "as used herein mean, and are used interchangeably with, the word" and/or, "unless the context clearly dictates otherwise. The word "such as" is used herein to mean, and is used interchangeably with, the phrase "such as but not limited to".
It should also be noted that in the devices, apparatuses, and methods of the present application, the components or steps may be decomposed and/or recombined. These decompositions and/or recombinations are to be considered as equivalents of the present application.
The previous description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects without departing from the scope of the application. Thus, the present application is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing description has been presented for purposes of illustration and description. Furthermore, the description is not intended to limit embodiments of the application to the form disclosed herein. While a number of example aspects and embodiments have been discussed above, those of skill in the art will recognize certain variations, modifications, alterations, additions and sub-combinations thereof.
Claims (10)
1. A direct current internal resistance detection method of a lithium ion power storage battery, wherein the lithium ion power storage battery comprises more than one single battery cell, and the method comprises the following steps:
determining a target discharge capacity value for the lithium ion power storage battery;
performing discharge treatment on the lithium ion power storage battery according to preset discharge conditions and the target discharge capacity value;
in the discharging process, collecting the voltage of the lithium ion power storage battery according to a preset voltage collecting frequency;
and determining the direct current internal resistance of the lithium ion power storage battery based on the acquired voltage.
2. The method of claim 1, wherein prior to the determining the target discharge capacity value for the lithium-ion power battery, the method further comprises:
determining an available capacity of the lithium ion power storage battery;
the determining a target discharge capacity value for the lithium-ion power battery comprises:
determining a target discharge capacity value for the lithium-ion power battery as a function of available capacity of the lithium-ion power battery.
3. The method of claim 2, wherein determining a target discharge capacity value for the lithium-ion power battery as a function of available capacity of the lithium-ion power battery comprises:
determining a target discharge capacity value for the lithium ion power battery by:
Cd＝Ct50% of ternary lithium/73% of lithium iron phosphate,
wherein, the CdIs a target discharge capacity value of a lithium ion power storage battery, CtIs the available capacity of the lithium ion power storage battery.
4. The method of claim 1, wherein the discharging the lithium-ion power storage battery according to preset discharge conditions and the target discharge capacity value comprises:
and under the condition that the lithium ion power storage battery is in a charge cut-off state, discharging the lithium ion power storage battery to the target discharge capacity value for the first time according to 1C.
5. The method of claim 1, wherein the discharging the lithium-ion power storage battery according to preset discharge conditions and the target discharge capacity value comprises:
and discharging the lithium ion power storage battery for the first time to the target discharge capacity value according to a preset discharge constraint condition of the lithium ion power storage battery, wherein the preset discharge constraint condition is preset by a manufacturer of the lithium ion power storage battery.
6. The method according to claim 4 or 5, characterized in that the method further comprises:
performing power-off standing treatment on the lithium ion power storage battery subjected to the primary discharge treatment for a first preset time, wherein the first preset time is 10 minutes, 15 minutes, 30 minutes or 60 minutes;
and performing secondary discharge treatment on the lithium ion power storage battery subjected to outage and standing treatment.
7. The method of claim 6, wherein the secondary discharge treatment of the lithium ion power storage battery subjected to the power-off standing treatment comprises:
and discharging the lithium ion power storage battery according to the 1C for a second preset time, wherein the second preset time is 10 seconds, 15 seconds, 30 seconds or 60 seconds.
8. The method of claim 1 or 7, wherein the step of collecting the voltage of the lithium ion power storage battery according to a preset voltage collecting frequency during the discharging process comprises:
collecting the initial discharge voltage and the final discharge voltage of the lithium ion power storage battery in the discharge process;
alternatively, the first and second electrodes may be,
in the discharging process, the cell voltage of each cell of the lithium ion power storage battery is acquired according to a first preset time difference, and the range of the first preset time difference is between 0 millisecond and 100 milliseconds.
9. The method of claim 8, further comprising:
and sending the acquired monomer voltage of the lithium ion power storage battery to a direct current charging network according to a second preset time difference, wherein the second preset time difference is between 0 second and 1 second.
10. The method of claim 8, wherein the determining the internal dc resistance of the lithium ion power battery based on the collected voltage comprises:
according to the initial discharge voltage and the final discharge voltage of the lithium ion power storage battery, determining the total direct current internal resistance value of the lithium ion power storage battery according to the following formula:
Rgeneral assembly＝(V1-V2)/I，
Wherein R isGeneral assemblyIs the total DC internal resistance value, V, of the lithium ion power storage battery1Is the discharge initial voltage, V, of the lithium ion power storage battery2The discharge termination voltage of the lithium ion power storage battery is shown, and I is 1C;
alternatively, the first and second electrodes may be,
according to the monomer voltage of the lithium ion power storage battery, determining the monomer direct current internal resistance of each monomer battery cell of the lithium ion power storage battery according to the following formula:
Rn＝(V1n-V2n)/I
wherein R isnIs the monomer direct current internal resistance, V, of the monomer cell with the serial number n of the lithium ion power storage battery1nThe voltage of the last frame of the single battery cell with the serial number n before secondary discharge of the lithium ion power storage battery is V2nAnd the voltage of the single battery cell with the serial number n at the end of secondary discharge of the lithium ion power storage battery is obtained.
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