CN113514769A - Method for simultaneously and rapidly testing IROCV (internal resistance control Voltage) of 128 lithium batteries - Google Patents
Method for simultaneously and rapidly testing IROCV (internal resistance control Voltage) of 128 lithium batteries Download PDFInfo
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- CN113514769A CN113514769A CN202110888528.7A CN202110888528A CN113514769A CN 113514769 A CN113514769 A CN 113514769A CN 202110888528 A CN202110888528 A CN 202110888528A CN 113514769 A CN113514769 A CN 113514769A
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Tests Of Electric Status Of Batteries (AREA)
Abstract
The invention relates to the technical field of lithium battery voltage test, and discloses a method for simultaneously carrying out IROCV quick test on 128 lithium batteries, firstly, the lithium batteries are connected with an IROCV system control interface, a current type SPI bus is adopted, a single chip can be used for two works of lithium battery voltage detection and balance control, a total system mainly adopts a stackable structure, thus a larger-scale voltage detection system can be provided, the chip can not generate large power consumption during standby, a lithium ion storage battery management chip mainly uses two devices of bus management and SPI bus to complete communication operation in an application structure of the battery voltage detection system, the SPI bus issues an operation instruction to an instruction parser, the 128 lithium batteries can be simultaneously tested by the lithium battery test system, the voltage of the 128 lithium batteries is serially connected to carry out actual voltage detection, and meanwhile, the voltage is calibrated, so that the accuracy of the calibrated system in the process of detecting the voltage of the battery is very high.
Description
Technical Field
The invention relates to the technical field of lithium battery voltage testing, in particular to a method for simultaneously carrying out IROCV (IROCV) quick testing on 128 lithium batteries.
Background
For the lithium ion storage battery, more is applied by the way of connecting a plurality of single batteries in series, and only this method meets a plurality of requirements provided by the power supply voltage, the battery performance directly affects the service life, the manufacturing process and the heat dissipation condition are very important influencing factors, the two work operation difficulties of the single battery temperature and the current detection are low, wherein the temperature detection suggests using a thermistor and a digital temperature sensor, the current detection suggests using a hall current sensor, however, the series lithium ion storage battery is to ensure the safety during the application period and prolong the service life, therefore, a voltage detection system is required to be applied in the work to detect the single battery voltage and current, etc.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a method for simultaneously carrying out an IROCV quick test on 128 lithium batteries.
(II) technical scheme
In order to realize the purposes that the voltages of 128 lithium batteries are connected in series to carry out actual voltage detection and are calibrated at the same time, so that the accuracy of a calibrated system in the battery voltage detection process is very high, the invention provides the following technical scheme: a method for simultaneously carrying out an IROCV quick test on 128 lithium batteries comprises the following steps:
(a) firstly, an IROCV system control interface is accessed to a lithium battery, a current type SPI bus is adopted, and a single chip can be used for two works of lithium battery voltage detection and balance control;
(b) the total system mainly adopts a stackable structure, so that a larger-scale voltage detection system can be provided, and the chip does not generate large power consumption during the standby period;
(c) in an application structure of a lithium ion storage battery management chip in a battery voltage detection system, communication operation is mainly completed by two devices, namely bus management and an SPI bus, the SPI bus issues an operation instruction to an instruction resolver, and the bus instruction is read out by a data register after analysis;
(d) the voltage detection and balance control functions of the single batteries are mainly realized by a data register, a 12-bit analog-to-digital converter and a multi-channel gate are used for comprehensively acquiring the voltages of all the single batteries, the final obtained result is stored in a voltage register, and the result is transmitted to a main controller by utilizing an SPI bus;
(e) the STM32F103RCT6 in the voltage detection system is an SPI bus host, the battery management unit mainly runs by means of an LTC6803 chip, and is used for cascading a plurality of units under the help of a current type SPI bus, and the battery management unit monitors a single lithium ion battery in real time;
(f) the voltage detection system control program is an MCU program running in the SPI bus host controller, the management system application program sends out specific instructions, and the control program is responsible for a series of work such as collecting and processing single voltage data.
Preferably, the chip only consumes 12 microamps in the standby mode, the conversion speed of the chip is high, the battery measurement can be finished within 13ms, and the self-test function circuit and the lead open-circuit connection fault detection function provide convenience for operation.
Preferably, after the calibration of the high-precision instrument is completed in the calibration operation, the voltage value can be used as an actual input quantity, and the voltage detection system can determine the original parameters required by calculation after reading the value.
Preferably, the lithium battery test system can simultaneously test 128 lithium batteries, actual voltage detection is performed by serially connecting the voltages of the 128 lithium batteries, and the voltages are calibrated, so that the accuracy of the calibrated system in the battery voltage detection process is very high.
Preferably, because of the improvement of the adaptability, the anti-interference performance and the like of the voltage detection system, a mean value filtering method is selected in actual operation, voltage data of each sampling point is continuously obtained for 8 times, then an average value is obtained, a final calculation result is used as a single battery voltage, the resolution of the analog-to-digital converter can be effectively improved through actual operation, the original 12 bits are improved to 15 bits, the resolution VLSB =0.19 mV, in other words, the value jitter value of the acquisition system is less than 0.2 mV, and the improvement of the anti-interference capability and the resolution of the voltage detection system is facilitated in the application process of the method through corresponding practical operation.
Preferably, in the operation process of the cell voltage reading program, the cell voltage is generally acquired after the LTC6803 finishes the cell voltage analog-to-digital conversion, in order to ensure the effect of the LTC6803 analog-to-digital converter, originally stored data of the voltage register must be cleared before the analog-to-digital conversion, and the AD data inside the MCU program is effectively verified, so that the validity of all data is improved.
(III) advantageous effects
Compared with the prior art, the invention provides a method for simultaneously carrying out the IROCV quick test on 128 lithium batteries, which has the following beneficial effects:
1. this method of carrying out IROCV quick test to 128 lithium cells simultaneously can carry out simultaneous test to 128 lithium cells through lithium cell test system, borrows to establish ties by the voltage with 128 lithium cells, carries out actual voltage detection, calibrates this voltage simultaneously, and the system after calibrating like this is at the in-process precision of battery voltage detection very high.
2. According to the method for simultaneously carrying out the IROCV quick test on the 128 lithium batteries, the power consumption of the chip is only 12 microamperes in the standby mode state, the conversion speed of the chip is high, the battery measurement can be finished within 13ms, and convenience is provided for operation by the self-test function circuit and the lead open-circuit connection fault detection function.
3. According to the method for simultaneously carrying out the IROCV quick test on the 128 lithium batteries, after the calibration of the high-precision instrument is completed in the calibration operation, the voltage value can be used as the actual input quantity, and after the voltage detection system reads the value, the original parameters required by calculation can be determined.
4. According to the method for simultaneously carrying out IROCV quick test on 128 lithium batteries, through the improvement of the adaptability, the anti-interference performance and the like of a voltage detection system, a mean value filtering method is selected in actual operation, voltage data of each sampling point are continuously obtained for 8 times, then an average value is obtained, a final calculation result is used as the voltage of a single battery, the resolution ratio of an analog-to-digital converter can be effectively improved through actual operation, the original 12 bits are improved to 15 bits, the resolution ratio VLSB =0.19 mV, in other words, the value jitter value of an acquisition system is less than 0.2 mV, and the corresponding practical operation shows that the method is beneficial to improving the anti-interference capability and the resolution ratio of the voltage detection system in the application process.
5. According to the method for simultaneously carrying out the IROCV quick test on the 128 lithium batteries, in the operation process of a single voltage reading program, the acquisition of the cell voltage is generally performed after the LTC6803 finishes the analog-to-digital conversion of the cell voltage, in order to ensure the effect of the LTC6803 adc, the data originally stored in the voltage register must be cleared before the adc, the AD data in the MCU program must be validated, thus increasing the validity of all data, when the LTC6803 issues a data register clear instruction, the SPI bus will convert the data format after 1 ms, making it the format of OxFF, and then, the control program sends an acquisition instruction to acquire the voltage of the single battery of the battery management unit, the voltage acquisition work can be finished after 13ms, and if the voltage value acquired by the control program is not OxFF, the hardware system can be determined to be normally operated.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
A method for simultaneously carrying out an IROCV quick test on 128 lithium batteries comprises the following steps:
(a) firstly, an IROCV system control interface is accessed to a lithium battery, a current type SPI bus is adopted, and a single chip can be used for two works of lithium battery voltage detection and balance control;
(b) the total system mainly adopts a stackable structure, so that a larger-scale voltage detection system can be provided, the chip does not generate large power consumption during standby, the power consumption of the chip is only 12 microamperes in a standby mode state, the conversion speed of the chip is high, the battery measurement can be finished within 13ms, and the self-test function circuit and the wire open-circuit connection fault detection function provide convenience for operation;
(c) in an application structure of a lithium ion storage battery management chip in a battery voltage detection system, communication operation is mainly completed through two devices, namely a bus management device and an SPI bus device, the SPI bus device issues an operation instruction to an instruction resolver, a data register reads out the bus instruction after analysis, a high-precision instrument in calibration operation can take a voltage value as an actual input quantity after calibration is completed, and a voltage detection system can determine an original parameter required by calculation after reading a numerical value;
(d) the voltage detection and balance control functions of the single batteries are mainly realized by a data register, a 12-bit analog-to-digital converter and a multi-channel gate are used for comprehensively acquiring the voltages of all the single batteries, the final obtained result is stored in a voltage register, and the result is transmitted to a main controller by utilizing an SPI bus;
(e) the STM32F103RCT6 inside the voltage detection system is an SPI bus master, the battery management unit is operated mainly by means of the LTC6803 chip, and a plurality of units are cascaded under the help of a current type SPI bus, a battery management unit carries out real-time supervision aiming at a single lithium ion battery, because the adaptability, the anti-interference performance and the like of the voltage detection system are improved, the average filtering method is selected in the actual operation, the voltage data of each sampling point is continuously obtained for 8 times, then, an average value is obtained, a final calculation result is used as the voltage of the single battery, the resolution of the analog-to-digital converter can be effectively improved through actual operation, the original 12 bits are improved to 15 bits, the resolution VLSB =0.19 mV, in other words, the value jitter value of the acquisition system is less than 0.2 mV, according to corresponding practical operation, the method is beneficial to improving the anti-interference capability and the resolution of the voltage detection system in the application process;
(f) the voltage detection system control program is an MCU program operated in an SPI bus host controller, a management system application program sends a specific instruction, the control program is responsible for a series of work of collecting and processing single voltage data and the like, the single voltage reading program is generally operated after the LTC6803 finishes the voltage analog-to-digital conversion of a single battery, in order to ensure the effect of the LTC6803 analog-to-digital converter, data originally stored in a voltage register must be cleared before the analog-to-digital conversion, AD data in the MCU program is effectively verified, so that the validity of all data is improved, when the LTC6803 sends a data register clearing instruction, an SPI bus converts a data format after 1 ms to enable the SPI bus to be in an OxFF format, then the control program sends a collecting instruction to collect the voltage of the single battery of a battery management unit, and finishing the voltage acquisition after 13ms, and if the voltage value acquired by the control program is not OxFF, determining that the hardware system operates normally.
Example two
A method for simultaneously carrying out an IROCV quick test on 128 lithium batteries comprises the following steps:
(a) firstly, an IROCV system control interface is accessed to a lithium battery, a current type SPI bus is adopted, and a single chip can be used for two works of lithium battery voltage detection and balance control;
(b) the main system mainly adopts a stackable structure, so that a larger-scale voltage detection system can be provided, the chip cannot generate large power consumption during standby, the power consumption of the chip is only 12 microamperes in a standby mode state, the conversion speed of the chip is high, the battery measurement can be finished within 13ms, the self-test function circuit and the wire open-circuit connection fault detection function provide convenience for operation, the lithium battery test system can simultaneously test 128 lithium batteries, actual voltage detection is carried out by connecting the voltages of the 128 lithium batteries in series, and the voltages are calibrated at the same time, so that the accuracy of the calibrated system in the battery voltage detection process is very high;
(c) in an application structure of a lithium ion storage battery management chip in a battery voltage detection system, communication operation is mainly completed through two devices, namely a bus management device and an SPI bus device, the SPI bus device issues an operation instruction to an instruction resolver, a data register reads out the bus instruction after analysis, a high-precision instrument in calibration operation can take a voltage value as an actual input quantity after calibration is completed, and a voltage detection system can determine an original parameter required by calculation after reading a numerical value;
(d) the voltage detection and balance control functions of the single batteries are mainly realized by a data register, a 12-bit analog-to-digital converter and a multi-channel gate are used for comprehensively acquiring the voltages of all the single batteries, the final obtained result is stored in a voltage register, and the result is transmitted to a main controller by utilizing an SPI bus;
(e) the STM32F103RCT6 inside the voltage detection system is an SPI bus master, the battery management unit is operated mainly by means of the LTC6803 chip, and a plurality of units are cascaded under the help of a current type SPI bus, a battery management unit carries out real-time supervision aiming at a single lithium ion battery, because the adaptability, the anti-interference performance and the like of the voltage detection system are improved, the average filtering method is selected in the actual operation, the voltage data of each sampling point is continuously obtained for 8 times, then, an average value is obtained, a final calculation result is used as the voltage of the single battery, the resolution of the analog-to-digital converter can be effectively improved through actual operation, the original 12 bits are improved to 15 bits, the resolution VLSB =0.19 mV, in other words, the value jitter value of the acquisition system is less than 0.2 mV, according to corresponding practical operation, the method is beneficial to improving the anti-interference capability and the resolution of the voltage detection system in the application process;
(f) the voltage detection system control program is an MCU program operated in an SPI bus host controller, a management system application program sends a specific instruction, the control program is responsible for a series of work of collecting and processing single voltage data and the like, the single voltage reading program is generally operated after the LTC6803 finishes the voltage analog-to-digital conversion of a single battery, in order to ensure the effect of the LTC6803 analog-to-digital converter, data originally stored in a voltage register must be cleared before the analog-to-digital conversion, AD data in the MCU program is effectively verified, so that the validity of all data is improved, when the LTC6803 sends a data register clearing instruction, an SPI bus converts a data format after 1 ms to enable the SPI bus to be in an OxFF format, then the control program sends a collecting instruction to collect the voltage of the single battery of a battery management unit, and finishing the voltage acquisition after 13ms, and if the voltage value acquired by the control program is not OxFF, determining that the hardware system operates normally.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A method for simultaneously carrying out an IROCV quick test on 128 lithium batteries comprises the following steps:
(a) firstly, an IROCV system control interface is accessed to a lithium battery, a current type SPI bus is adopted, and a single chip can be used for two works of lithium battery voltage detection and balance control;
(b) the total system mainly adopts a stackable structure, so that a larger-scale voltage detection system can be provided, and the chip does not generate large power consumption during the standby period;
(c) in an application structure of a lithium ion storage battery management chip in a battery voltage detection system, communication operation is mainly completed by two devices, namely bus management and an SPI bus, the SPI bus issues an operation instruction to an instruction resolver, and the bus instruction is read out by a data register after analysis;
(d) the voltage detection and balance control functions of the single batteries are mainly realized by a data register, a 12-bit analog-to-digital converter and a multi-channel gate are used for comprehensively acquiring the voltages of all the single batteries, the final obtained result is stored in a voltage register, and the result is transmitted to a main controller by utilizing an SPI bus;
(e) the STM32F103RCT6 in the voltage detection system is an SPI bus host, the battery management unit mainly runs by means of an LTC6803 chip, and is used for cascading a plurality of units under the help of a current type SPI bus, and the battery management unit monitors a single lithium ion battery in real time;
(f) the voltage detection system control program is an MCU program running in the SPI bus host controller, the management system application program sends out specific instructions, and the control program is responsible for a series of work such as collecting and processing single voltage data.
2. The method for simultaneously performing the IROCV rapid test on 128 lithium batteries according to claim 1, wherein: the power consumption of the chip is only 12 microamperes in the standby mode state, the conversion speed of the chip is high, the battery measurement can be finished within 13ms, and the operation is facilitated by the self-test function circuit and the lead open-circuit connection fault detection function.
3. The method for simultaneously performing the IROCV rapid test on 128 lithium batteries according to claim 1, wherein: after the calibration of the high-precision instrument is completed in the calibration operation, the voltage value can be used as the actual input quantity, and the original parameters required by calculation can be determined after the voltage detection system reads the value.
4. The method for simultaneously performing the IROCV rapid test on 128 lithium batteries according to claim 3, wherein: the lithium battery test system can simultaneously test 128 lithium batteries, actual voltage detection is carried out by serially connecting the voltages of the 128 lithium batteries, and the voltages are calibrated, so that the accuracy of the calibrated system in the process of battery voltage detection is very high.
5. The method for simultaneously performing the IROCV rapid test on 128 lithium batteries according to claim 1, wherein: because of the improvement of the adaptability, the anti-interference performance and the like of the voltage detection system, a mean value filtering method is selected in actual operation, voltage data of each sampling point is continuously obtained for 8 times, then an average value is obtained, a final calculation result is used as the voltage of the single battery, the resolution of the analog-to-digital converter can be effectively improved through the actual operation, the original 12 bits are improved to 15 bits, the resolution VLSB =0.19 mV, in other words, the value jitter value of the acquisition system is less than 0.2 mV, and the improvement of the anti-interference capability and the resolution of the voltage detection system is facilitated in the application process of the method through corresponding practical operation.
6. The method for simultaneously performing the IROCV rapid test on 128 lithium batteries according to claim 1, wherein: in the operation process of the monomer voltage reading program, the monomer voltage is generally obtained after the LTC6803 finishes the analog-to-digital conversion of the monomer battery voltage, in order to ensure the effect of the LTC6803 analog-to-digital converter, originally stored data of a voltage register must be cleared before the analog-to-digital conversion, AD data inside an MCU program is effectively verified, and therefore the effectiveness of all data is improved.
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Application publication date: 20211019 |