CN114167300A - SOC (System on chip) standard capacity method - Google Patents
SOC (System on chip) standard capacity method Download PDFInfo
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- CN114167300A CN114167300A CN202210033487.8A CN202210033487A CN114167300A CN 114167300 A CN114167300 A CN 114167300A CN 202210033487 A CN202210033487 A CN 202210033487A CN 114167300 A CN114167300 A CN 114167300A
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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
- G01R31/387—Determining ampere-hour charge capacity or SoC
Abstract
The invention discloses a standard method of SOC, which comprises the steps of giving an initial value to AH total of a battery of a BMS system, and recording the AH value after charging/discharging is finished in the charging/discharging ampere-hour integration process of the BMS system; the BMS judges whether the accumulated AH value in the whole charging/discharging process needs to be stored in the EEPROM; and comparing the accumulated AH values of the two constant-voltage charging/discharging times, writing the obtained AH of the battery into the EEPROM again, and reading the real AH of the whole battery from the EEPROM to replace the original nominal AH total value of the battery when the battery leaves the factory. The invention has the beneficial effects that: the SOC estimation precision is improved, meanwhile, the AH total is automatically updated, the cost of manually refreshing the AH total is reduced, convenience and rapidness are realized, the standard of the AH total is automatically completed, and manual modification is not needed; the charging and discharging directions are judged through the current, and after the whole voltage of the battery is judged, the AH accumulated value is stored in the EEPROM, the AH is always thinner in real time, and the SOC estimation precision is improved.
Description
Technical Field
The invention relates to a capacity marking method, in particular to a capacity marking method of a System On Chip (SOC), and belongs to the technical field of battery management systems.
Background
When the SOC of the existing battery is calculated, the total capacity AH of the battery is continuously reduced after the battery is charged and discharged for many times and is no longer a nominal value when the battery leaves a factory; therefore, if the nominal value is always used instead of the actual value when the SOC value is calculated, the SOC calculation error is larger and larger as time goes on, and therefore the battery needs to be periodically subjected to the standard capacity processing after being used for a period of time.
The prior art has the following technical problems:
1) the conventional OCV-SOC for calibrating the total capacity of the SOC mostly corresponds to the SOC to obtain a total AH value of the battery, but when the OCV is collected, the voltage of the battery floats, so that the accurate OCV cannot be collected, and the total AH value with a large error is obtained;
2) the standard capacity of present battery often adopts, artifical manual mode, after carrying out charge-discharge promptly, the AH total number that obtains the data of testing sets up to the procedure in, or uses the host computer to go in burning the on-the-spot BMS system with the total AH number of battery this moment, accomplishes the SOC standard capacity of battery, and the operation is more troublesome like this, can not automatic update total AH number.
Disclosure of Invention
The present invention is directed to a method for scaling an SOC in order to solve the above-mentioned problems.
The invention realizes the purpose through the following technical scheme: a method for marking SOC comprises the following steps
Step one, in the process of charging and discharging a battery, a system endows an initial value to AH of the battery of a BMS system, wherein the initial value is the factory nominal AH number of the battery; then, when the BMS calculates the SOC in the charging and discharging processes, the used AH is the factory nominal AH number of the battery;
step two, recording the AH value after charging/discharging in the charging/discharging ampere-hour integration process of the BMS system;
step three, the BMS judges whether the accumulated AH value in the whole charging/discharging process needs to be stored in an EEPROM;
step four, comparing the accumulated AH values of the constant voltage charge/discharge twice, wherein the larger value is as follows: AH total at this time for the cell;
step five, rewriting the battery AH total obtained in the step four into an EEPROM, and reading the real AH total of the whole battery from the EEPROM to replace the original nominal AH total value of the battery when the battery leaves the factory; calculating the SOC;
step six: and continuously repeating the second step to the fifth step to finish the real-time standard capacity updating of the SOC capacity. As a still further scheme of the invention: in the third step, the charging and discharging direction is judged through the current, and when the current is positive, the battery is in the discharging process;
and (3) judging:
the whole voltage of the battery is less than or equal to the lower limit of the battery at the moment, the voltage is cut off, and the current value is less than 0.05C,
if so: it is stated that the battery is subjected to SOC calibration by constant voltage discharge, and the AH accumulated value of the process is stored in the EEPROM.
As a still further scheme of the invention: in the third step, the charging and discharging direction is judged through the current, and when the current is negative, the battery is in the charging process;
and (3) judging:
the whole voltage of the battery is larger than or equal to the upper limit cut-off voltage of the battery and the current value is smaller than 0.05C,
if so: it is stated that the battery is SOC-scaled in constant voltage charging, and the AH accumulated value of this process is stored in the EEPROM.
As a still further scheme of the invention: in the fifth step, the calculation of the SOC adopts the following formula:
SOC ═ SOCO +. integral ^ Idt/AH Total
Wherein, SOC 0: an initial value of SOC;
integral multiple of Idt: number of changed capacity AH;
AH Total: total capacity AH of the battery.
The invention has the beneficial effects that:
1. real-time capacity updating of SOC capacity is completed through a repeated calculation process of the system, so that SOC estimation precision is improved, meanwhile, the AH total is automatically updated, manual AH total updating cost is reduced, convenience and rapidness are realized, the standard capacity of the AH total is automatically completed, and manual modification is not needed;
2. the charging and discharging directions are judged through the current, and after the whole voltage of the battery is judged, the AH accumulated value is stored in the EEPROM, the AH is always thinner in real time, and the SOC estimation precision is improved.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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
As shown in fig. 1, a method for calibrating SOC includes the following steps:
step one, in the process of charging and discharging a battery, a system endows an initial value to AH of the battery of a BMS system, and the initial value is the factory nominal AH number of the battery; then, when the BMS calculates the SOC in the charging and discharging processes, the used AH is the factory nominal AH number of the battery;
step two, recording the AH value after charging/discharging in the charging/discharging ampere-hour integration process of the BMS system;
step three, the BMS judges whether the accumulated AH value in the whole charging/discharging process needs to be stored in an EEPROM;
judging the charging and discharging direction through the current, and when the current is positive, the battery is in the discharging process;
and (3) judging:
the whole voltage of the battery is less than or equal to the lower limit of the battery at the moment, the voltage is cut off, and the current value is less than 0.05C,
if so: then, the battery is subjected to SOC standard capacity during constant voltage discharge, and the AH accumulated value of the process is stored into the EEPROM;
step four, comparing the accumulated AH values of the constant voltage charge/discharge twice, wherein the larger value is as follows: AH total at this time for the cell;
step five, rewriting the battery AH total obtained in the step four into an EEPROM, and reading the real AH total of the whole battery from the EEPROM to replace the original nominal AH total value of the battery when the battery leaves the factory; calculating the SOC; the following formula is used:
SOC (SOC) 0 ++ Idt/AH total
Wherein, SOC 0: an initial value of SOC;
integral multiple of Idt: number of changed capacity AH;
AH Total: total capacity AH of the battery.
Step six: and continuously repeating the second step to the fifth step to complete real-time capacity updating of the SOC capacity, so that the SOC estimation precision is improved, the AH total is automatically updated, the manual AH total refreshing cost is reduced, and the method is convenient and fast.
Example two
Referring to fig. 1, a method for calibrating SOC includes the following steps:
step one, in the process of charging and discharging a battery, a system endows an initial value to AH of the battery of a BMS system, and the initial value is the factory nominal AH number of the battery; then, when the BMS calculates the SOC in the charging and discharging processes, the used AH is the factory nominal AH number of the battery;
step two, recording the AH value after charging/discharging in the charging/discharging ampere-hour integration process of the BMS system;
step three, the BMS judges whether the accumulated AH value in the whole charging/discharging process needs to be stored in an EEPROM;
judging the charging and discharging direction through the current, and when the current is negative, the battery is in a charging process;
and (3) judging:
the whole voltage of the battery is larger than or equal to the upper limit cut-off voltage of the battery and the current value is smaller than 0.05C,
if so: then, the battery is subjected to SOC standard capacity during constant voltage charging, and the AH accumulated value of the process is stored into the EEPROM;
step four, comparing the accumulated AH values of the constant voltage charge/discharge twice, wherein the larger value is as follows: AH total at this time for the cell;
step five, rewriting the battery AH total obtained in the step four into an EEPROM, and reading the real AH total of the whole battery from the EEPROM to replace the original nominal AH total value of the battery when the battery leaves the factory; calculating the SOC; the following formula is used:
SOC (SOC) 0 ++ Idt/AH total
Wherein, SOC 0: an initial value of SOC;
integral multiple of Idt: number of changed capacity AH;
AH Total: total capacity AH of the battery.
Step six: and continuously repeating the second step to the fifth step to complete real-time capacity updating of the SOC capacity, so that the SOC estimation precision is improved, the AH total is automatically updated, the manual AH total refreshing cost is reduced, and the method is convenient and fast.
The working principle is as follows: the BMS judges whether the accumulated AH value in the whole charging/discharging process needs to be stored in the EEPROM;
judging the charging and discharging direction through the current, and when the current is positive, the battery is in the discharging process;
and (3) judging:
the whole voltage of the battery is less than or equal to the lower limit of the battery at the moment, the voltage is cut off, and the current value is less than 0.05C,
if so: then, the battery is subjected to SOC standard capacity during constant voltage discharge, and the AH accumulated value of the process is stored into the EEPROM;
judging the charging and discharging direction through the current, and when the current is negative, the battery is in a charging process;
and (3) judging:
the whole voltage of the battery is larger than or equal to the upper limit cut-off voltage of the battery and the current value is smaller than 0.05C,
if so: then, the battery is subjected to SOC standard capacity during constant voltage charging, and the AH accumulated value of the process is stored into the EEPROM; comparing the cumulative AH values of the constant voltage charge/discharge twice, wherein the larger value is as follows: AH total at this time for the cell; writing the battery AH obtained in the step four into the EEPROM again, and reading the real AH of the whole battery from the EEPROM to replace the original nominal AH total value of the battery when the battery leaves the factory; continuing to calculate the SOC; the real-time capacitor updating of the SOC capacity is completed by continuously repeating the process, so that the SOC estimation precision is improved, the AH total is automatically updated, the manual AH total refreshing cost is reduced, and the method is convenient and fast.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. A method for scaling an SOC, comprising: comprises the following steps
Step one, in the process of charging and discharging a battery, a system endows an initial value to AH of the battery of a BMS system, wherein the initial value is the factory nominal AH number of the battery; then, when the BMS calculates the SOC in the charging and discharging processes, the used AH is the factory nominal AH number of the battery;
step two, recording the AH value after charging/discharging in the charging/discharging ampere-hour integration process of the BMS system;
step three, the BMS system judges whether to store the accumulated AH value in the whole charging/discharging process into an EEPROM;
step four, comparing the accumulated AH values of the constant voltage charge/discharge twice, wherein the larger value is as follows: AH total at this time for the cell;
step five, rewriting the battery AH total obtained in the step four into an EEPROM, and reading the real AH total of the whole battery from the EEPROM to replace the original nominal AH total value of the battery when the battery leaves the factory; calculating the SOC;
step six: and continuously repeating the second step to the fifth step to finish the real-time standard capacity updating of the SOC capacity.
2. The method of claim 1 for scaling a SOC, comprising: in the third step, the charging and discharging direction is judged through the current, and when the current is positive, the battery is in the discharging process;
and (3) judging:
the whole voltage of the battery is less than or equal to the lower limit of the battery at the moment, the voltage is cut off, and the current value is less than 0.05C,
if so: it is stated that the battery is subjected to SOC calibration by constant voltage discharge, and the AH accumulated value of the process is stored in the EEPROM.
3. The method of claim 1 for scaling a SOC, comprising: in the third step, the charging and discharging direction is judged through the current, and when the current is negative, the battery is in the charging process;
and (3) judging:
the whole voltage of the battery is larger than or equal to the upper limit cut-off voltage of the battery and the current value is smaller than 0.05C,
if so: it is stated that the battery is SOC-scaled in constant voltage charging, and the AH accumulated value of this process is stored in the EEPROM.
4. The method of claim 1 for scaling a SOC, comprising: in the fifth step, the calculation of the SOC adopts the following formula:
SOC (SOC) 0 ++ Idt/AH total
Wherein, SOC 0: an initial value of SOC;
integral multiple of Idt: number of changed capacity AH;
AH Total: total capacity AH of the battery.
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