CN112684344A - Monomer voltage correction method for collecting and balancing collinear in active balancing BMS - Google Patents
Monomer voltage correction method for collecting and balancing collinear in active balancing BMS Download PDFInfo
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Abstract
The invention discloses a method for correcting single voltage during collecting and balancing collineation in an active balancing BMS, which comprises the following steps: and controlling an electronic circuit by adopting a software algorithm, automatically measuring the resistance of all wires, carrying out amplitude limiting on the measured value, and finally storing the correct and credible measured value into an EEPROM. According to the monomer voltage correction method during collection and equalization of the common lines in the active equalization BMS, the software algorithm automatically measures the resistance value of the lead, and then corrects the collected monomer voltage in real time according to the equalization current value, the resistance value of the lead and the charging and discharging directions, so that the voltage collection error caused by the voltage drop caused by the resistance of the lead is effectively reduced, and the collected monomer voltage is corrected in real time.
Description
Technical Field
The invention belongs to the technical field of single voltage correction, and particularly relates to a single voltage correction method for acquiring and balancing collinear in an active balancing BMS.
Background
The function of collecting and balancing the cell voltage in an active balancing Battery Management System (BMS) is important. When the balancing is carried out, if only one lead (namely, acquisition and balancing collinear) is arranged at the connecting end (the positive electrode or the negative electrode) of the single battery, a certain voltage drop can be generated on the lead due to the resistance (generally dozens of milliohms) of the lead, so that the error between the actual voltage and the voltage acquired through an electronic circuit is large (dozens of millivolts to hundreds of millivolts), and the 10mV required by the national standard of GBT38661-2020 cannot be met; therefore, a method for correcting the cell voltage during collecting and balancing the common lines in the active balancing BMS is provided.
Disclosure of Invention
The invention aims to provide a method for correcting a single voltage during the process of collecting and balancing collineations in an active balancing BMS, so as to solve the problem of the background technology.
In order to achieve the purpose, the specific technical scheme of the method for correcting the single voltage during the collinear collection and equalization in the active equalization BMS is as follows:
a method for correcting single voltage during collinear acquisition and equalization in an active equalization BMS comprises the following steps: and controlling an electronic circuit by adopting a software algorithm, automatically measuring the resistance of all wires, carrying out amplitude limiting on the measured value, and finally storing the correct and credible measured value into an EEPROM.
Further, the battery pack is numbered as 1, 2 and 3 … n according to the single battery, the voltage collecting points of the 1 st battery are 1 and 2, the voltage collecting points of the 2 nd battery are 2 and 3, the voltage collecting points of the 3 rd battery are 3 and 4, and so on, the voltage collecting points of the nth battery are n and n + 1.
Furthermore, the resistance of the positive electrode connecting lead of the 1 st battery is R1, and the resistance of the negative electrode connecting lead is R2; the resistance of the positive electrode connecting lead of the No. 2 battery is R2, and the resistance of the negative electrode connecting lead is R3; the resistance of the positive electrode connecting wire of the 3 rd battery is R3, the resistance of the negative electrode connecting wire is R4, and so on, the resistance of the positive electrode connecting wire of the nth battery is Rn, and the resistance of the negative electrode connecting wire is Rn + 1.
Further, the software algorithm takes control measurements of the charge mode and the discharge mode of the battery.
Further, for the charging mode, the software algorithm controlled measurement comprises the following steps:
s11, taking the 2 nd battery as an example, when it is in the charging mode (equalizing current I flows from the collecting point 2), the following results are obtained from kirchhoff' S law:
U2’＝U2+I×R2+I×R3 1；
U1’＝U1–I×R2 2；
U3’＝U3–I×R3 3；
u1 ', U2 ' and U3 ' represent voltages collected by an electronic circuit, U1, U2 and U3 represent actual voltages of batteries, I represents equalizing current, and R2 and R3 values are known, then the actual voltage values U1, U2 and U3 can be calculated by formulas 1, 2 and 3, and analytical formulas 1, 2 and 3 can know that when a certain battery is in a charging mode, the collected voltage is higher than the actual voltage, two adjacent batteries are influenced, and the collected voltage is lower than the actual voltage and needs to be corrected;
s12, making the balance current I equal to 0, namely, the batteries of 1 st, 2 nd and 3 rd are not balanced, and acquiring the voltages U1, U2 and U3 of the batteries of 1 st, 2 nd and 3 rd through an electronic circuit;
s13, charging the 2 nd battery by current I (≠ 0), and acquiring the voltages U1 'and U2' of the 1 st and 2 nd batteries through electronic circuit acquisition;
s14, wherein the formulas 1 and 2 are still true in the step S1; after knowing U1, U1' and I, R2 can be calculated from formula 2;
s15, knowing U2, U2', I and R2, R3 can be calculated from formula 1;
s16, charging the 1 st battery with current I (≠ 0), and acquiring the voltage U1' through an electronic circuit, wherein the method comprises the following steps:
U1’＝U1+I×R1+I×R2 4；
after U1, U1', I and R2 are known, R1 can be calculated from formula 4;
s17, charging the 3 rd battery by current I (≠ 0), and acquiring the voltage U3' by an electronic circuit, wherein the method comprises the following steps:
U3’＝U3+I×R3+I×R4 5；
after U3, U3', I and R3 are known, R4 can be calculated from formula 5;
s18, so far, all wire resistances are control measured in this manner.
Further, for the discharging mode, the software algorithm controlled measurement comprises the following steps:
s21, taking the 2 nd battery as an example, when it is in the discharging mode (the equalizing current I flows from the collecting point 3), the following results are obtained from kirchhoff' S law:
U2’＝U2-I×R2-I×R3 6；
U1’＝U1+I×R2 7；
U3’＝U3+I×R3 8；
u1 ', U2 ' and U3 ' represent voltages collected by an electronic circuit, U1, U2 and U3 represent actual voltages of batteries, I represents equalizing current, R2 and R3 values are known, actual voltage values U1, U2 and U3 can be calculated by formulas 6, 7 and 8, and analytical formulas 6, 7 and 8 show that when a certain battery is in a discharging mode, the collected voltage is lower than the actual voltage; two adjacent batteries are also affected, and the acquired voltage is higher than the actual voltage and needs to be corrected;
s22, making the balance current I equal to 0, namely, the batteries of 1 st, 2 nd and 3 rd are not balanced, and acquiring the voltages U1, U2 and U3 of the batteries of 1 st, 2 nd and 3 rd through an electronic circuit;
s23, discharging the 2 nd battery by current I (≠ 0), and acquiring the voltages U1 'and U2' of the 1 st and 2 nd batteries through electronic circuit acquisition;
s24, in which case, the formulas 6 and 7 are still true in step S1; after knowing U1, U1' and I, R2 can be calculated from formula 7;
s25, knowing U2, U2', I and R2, R3 can be calculated from formula 6;
s26, discharging the 1 st battery by current I (≠ 0), and acquiring the voltage U1' by an electronic circuit, wherein the method comprises the following steps:
U1’＝U1-I×R1-I×R2 9；
after U1, U1', I and R2 are known, R1 can be calculated from formula 9;
s27, discharging the 3 rd battery by current I (≠ 0), and acquiring the voltage U3' by an electronic circuit, wherein the method comprises the following steps:
U3’＝U3-I×R3-I×R4 10；
after U3, U3', I and R3 are known, R4 can be calculated from formula 10;
s28, so far, all wire resistances were measured in this manner.
Further, the software algorithm controlled measurement is suitable for more than three battery packs.
Compared with the prior art, the invention has the following beneficial effects: according to the monomer voltage correction method during collection and equalization of the common lines in the active equalization BMS, the software algorithm automatically measures the resistance value of the lead, and then corrects the collected monomer voltage in real time according to the equalization current value, the resistance value of the lead and the charging and discharging directions, so that the voltage collection error caused by the voltage drop caused by the resistance of the lead is effectively reduced, and the collected monomer voltage is corrected in real time.
Drawings
Fig. 1 is a schematic diagram of the acquisition and equalization of n single batteries according to the invention.
Detailed Description
For a better understanding of the objects, structure and function of the invention, reference should be made to FIG. 1 for a better understanding of the invention.
A method for correcting single voltage during collinear acquisition and equalization in an active equalization BMS comprises the following steps: and controlling an electronic circuit by adopting a software algorithm, automatically measuring the resistance of all wires, carrying out amplitude limiting on the measured value, and finally storing the correct and credible measured value into an EEPROM.
The battery pack is numbered as 1, 2 and 3 … n according to the single battery, the voltage collecting points of the 1 st battery are 1 and 2, the voltage collecting points of the 2 nd battery are 2 and 3, the voltage collecting points of the 3 rd battery are 3 and 4, and so on, the voltage collecting points of the nth battery are n and n + 1.
The resistance of the positive electrode connecting lead of the 1 st battery is R1, and the resistance of the negative electrode connecting lead is R2; the resistance of the positive electrode connecting lead of the No. 2 battery is R2, and the resistance of the negative electrode connecting lead is R3; the resistance of the positive electrode connecting wire of the 3 rd battery is R3, the resistance of the negative electrode connecting wire is R4, and so on, the resistance of the positive electrode connecting wire of the nth battery is Rn, and the resistance of the negative electrode connecting wire is Rn + 1.
The software algorithm takes control measurements of the charge mode and the discharge mode of the battery.
Wherein for the charging mode, the software algorithm controlled measurement comprises the steps of:
s11, taking the 2 nd battery as an example, when it is in the charging mode (equalizing current I flows from the collecting point 2), the following results are obtained from kirchhoff' S law:
U2’＝U2+I×R2+I×R3 1；
U1’＝U1–I×R2 2；
U3’＝U3–I×R3 3；
u1 ', U2 ' and U3 ' represent voltages collected by an electronic circuit, U1, U2 and U3 represent actual voltages of batteries, I represents equalizing current, and R2 and R3 values are known, then the actual voltage values U1, U2 and U3 can be calculated by formulas 1, 2 and 3, and analytical formulas 1, 2 and 3 can know that when a certain battery is in a charging mode, the collected voltage is higher than the actual voltage, two adjacent batteries are influenced, and the collected voltage is lower than the actual voltage and needs to be corrected;
s12, making the balance current I equal to 0, namely, the batteries of 1 st, 2 nd and 3 rd are not balanced, and acquiring the voltages U1, U2 and U3 of the batteries of 1 st, 2 nd and 3 rd through an electronic circuit;
s13, charging the 2 nd battery by current I (≠ 0), and acquiring the voltages U1 'and U2' of the 1 st and 2 nd batteries through electronic circuit acquisition;
s14, wherein the formulas 1 and 2 are still true in the step S1; after knowing U1, U1' and I, R2 can be calculated from formula 2;
s15, knowing U2, U2', I and R2, R3 can be calculated from formula 1;
s16, charging the 1 st battery with current I (≠ 0), and acquiring the voltage U1' through an electronic circuit, wherein the method comprises the following steps:
U1’＝U1+I×R1+I×R2 4；
after U1, U1', I and R2 are known, R1 can be calculated from formula 4;
s17, charging the 3 rd battery by current I (≠ 0), and acquiring the voltage U3' by an electronic circuit, wherein the method comprises the following steps:
U3’＝U3+I×R3+I×R4 5；
after U3, U3', I and R3 are known, R4 can be calculated from formula 5;
s18, so far, all wire resistances are control measured in this manner.
In addition, for the discharge mode, the software algorithm controlled measurement comprises the following steps:
s21, taking the 2 nd battery as an example, when it is in the discharging mode (the equalizing current I flows from the collecting point 3), the following results are obtained from kirchhoff' S law:
U2’＝U2-I×R2-I×R3 6；
U1’＝U1+I×R2 7；
U3’＝U3+I×R3 8；
u1 ', U2 ' and U3 ' represent voltages collected by an electronic circuit, U1, U2 and U3 represent actual voltages of batteries, I represents equalizing current, R2 and R3 values are known, actual voltage values U1, U2 and U3 can be calculated by formulas 6, 7 and 8, and analytical formulas 6, 7 and 8 show that when a certain battery is in a discharging mode, the collected voltage is lower than the actual voltage; two adjacent batteries are also affected, and the acquired voltage is higher than the actual voltage and needs to be corrected;
s22, making the balance current I equal to 0, namely, the batteries of 1 st, 2 nd and 3 rd are not balanced, and acquiring the voltages U1, U2 and U3 of the batteries of 1 st, 2 nd and 3 rd through an electronic circuit;
s23, discharging the 2 nd battery by current I (≠ 0), and acquiring the voltages U1 'and U2' of the 1 st and 2 nd batteries through electronic circuit acquisition;
s24, in which case, the formulas 6 and 7 are still true in step S1; after knowing U1, U1' and I, R2 can be calculated from formula 7;
s25, knowing U2, U2', I and R2, R3 can be calculated from formula 6;
s26, discharging the 1 st battery by current I (≠ 0), and acquiring the voltage U1' by an electronic circuit, wherein the method comprises the following steps:
U1’＝U1-I×R1-I×R2 9；
after U1, U1', I and R2 are known, R1 can be calculated from formula 9;
s27, discharging the 3 rd battery by current I (≠ 0), and acquiring the voltage U3' by an electronic circuit, wherein the method comprises the following steps:
U3’＝U3-I×R3-I×R4 10；
after U3, U3', I and R3 are known, R4 can be calculated from formula 10;
s28, so far, all wire resistances were measured in this manner.
The measurement controlled by the software algorithm is suitable for more than three battery packs.
The software algorithm automatically measures the resistance value of the lead, and then corrects the acquired monomer voltage in real time according to the balanced current value, the resistance value of the lead and the charging and discharging directions, so that voltage acquisition errors caused by voltage drop caused by the resistance of the lead are effectively reduced, and the purpose of correcting the acquired monomer voltage in real time is achieved. In addition, in order to ensure the precision, even if the wire resistance data read from the EEPROM is effective after being electrified, a software algorithm can be used for controlling the electronic circuit to execute the measurement process again, so that the former measurement result is still used after the wire resistance value is changed, and the instantaneity is ensured.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. A method for correcting single voltage during collinear acquisition and equalization in an active equalization BMS is characterized by comprising the following steps: and controlling an electronic circuit by adopting a software algorithm, automatically measuring the resistance of all wires, carrying out amplitude limiting on the measured value, and finally storing the correct and credible measured value into an EEPROM.
2. The method for correcting cell voltages during collinear collection and equalization in an active equalization BMS as claimed in claim 1, wherein the battery pack is assigned to individual cell numbers of 1, 2, and 3 … n, wherein the voltage collection points for the 1 st cell are 1 and 2, the voltage collection points for the 2 nd cell are 2 and 3, the voltage collection points for the 3 rd cell are 3 and 4, and so on, and the voltage collection points for the nth cell are n and n + 1.
3. The method of claim 2, wherein the 1 st cell has a positive lead resistance of R1 and a negative lead resistance of R2; the resistance of the positive electrode connecting lead of the No. 2 battery is R2, and the resistance of the negative electrode connecting lead is R3; the resistance of the positive electrode connecting wire of the 3 rd battery is R3, the resistance of the negative electrode connecting wire is R4, and so on, the resistance of the positive electrode connecting wire of the nth battery is Rn, and the resistance of the negative electrode connecting wire is Rn + 1.
4. The method of claim 3, wherein the software algorithm takes control measurements of the charge mode and the discharge mode of the battery.
5. The method of claim 4, wherein the software algorithm controlled measurements for charge mode comprise the steps of:
s11, taking the 2 nd battery as an example, when it is in the charging mode (equalizing current I flows from the collecting point 2), the following results are obtained from kirchhoff' S law:
U2’＝U2+I×R2+I×R3 1；
U1’＝U1–I×R2 2；
U3’＝U3–I×R3 3；
u1 ', U2 ' and U3 ' represent voltages collected by an electronic circuit, U1, U2 and U3 represent actual voltages of batteries, I represents equalizing current, and R2 and R3 values are known, then the actual voltage values U1, U2 and U3 can be calculated by formulas 1, 2 and 3, and analytical formulas 1, 2 and 3 can know that when a certain battery is in a charging mode, the collected voltage is higher than the actual voltage, two adjacent batteries are influenced, and the collected voltage is lower than the actual voltage and needs to be corrected;
s12, making the balance current I equal to 0, namely, the batteries of 1 st, 2 nd and 3 rd are not balanced, and acquiring the voltages U1, U2 and U3 of the batteries of 1 st, 2 nd and 3 rd through an electronic circuit;
s13, charging the 2 nd battery by current I (≠ 0), and acquiring the voltages U1 'and U2' of the 1 st and 2 nd batteries through electronic circuit acquisition;
s14, wherein the formulas 1 and 2 are still true in the step S1; after knowing U1, U1' and I, R2 can be calculated from formula 2;
s15, knowing U2, U2', I and R2, R3 can be calculated from formula 1;
s16, charging the 1 st battery with current I (≠ 0), and acquiring the voltage U1' through an electronic circuit, wherein the method comprises the following steps:
U1’＝U1+I×R1+I×R2 4；
after U1, U1', I and R2 are known, R1 can be calculated from formula 4;
s17, charging the 3 rd battery by current I (≠ 0), and acquiring the voltage U3' by an electronic circuit, wherein the method comprises the following steps:
U3’＝U3+I×R3+I×R4 5；
after U3, U3', I and R3 are known, R4 can be calculated from formula 5;
s18, so far, all wire resistances are control measured in this manner.
6. The method of claim 4, wherein the software algorithm controlled measurements for discharging mode comprises the steps of:
s21, taking the 2 nd battery as an example, when it is in the discharging mode (the equalizing current I flows from the collecting point 3), the following results are obtained from kirchhoff' S law:
U2’＝U2-I×R2-I×R3 6；
U1’＝U1+I×R2 7；
U3’＝U3+I×R3 8；
u1 ', U2 ' and U3 ' represent voltages collected by an electronic circuit, U1, U2 and U3 represent actual voltages of batteries, I represents equalizing current, R2 and R3 values are known, actual voltage values U1, U2 and U3 can be calculated by formulas 6, 7 and 8, and analytical formulas 6, 7 and 8 show that when a certain battery is in a discharging mode, the collected voltage is lower than the actual voltage; two adjacent batteries are also affected, and the acquired voltage is higher than the actual voltage and needs to be corrected;
s22, making the balance current I equal to 0, namely, the batteries of 1 st, 2 nd and 3 rd are not balanced, and acquiring the voltages U1, U2 and U3 of the batteries of 1 st, 2 nd and 3 rd through an electronic circuit;
s23, discharging the 2 nd battery by current I (≠ 0), and acquiring the voltages U1 'and U2' of the 1 st and 2 nd batteries through electronic circuit acquisition;
s24, in which case, the formulas 6 and 7 are still true in step S1; after knowing U1, U1' and I, R2 can be calculated from formula 7;
s25, knowing U2, U2', I and R2, R3 can be calculated from formula 6;
s26, discharging the 1 st battery by current I (≠ 0), and acquiring the voltage U1' by an electronic circuit, wherein the method comprises the following steps:
U1’＝U1-I×R1-I×R2 9；
after U1, U1', I and R2 are known, R1 can be calculated from formula 9;
s27, discharging the 3 rd battery by current I (≠ 0), and acquiring the voltage U3' by an electronic circuit, wherein the method comprises the following steps:
U3’＝U3-I×R3-I×R4 10；
after U3, U3', I and R3 are known, R4 can be calculated from formula 10;
s28, so far, all wire resistances were measured in this manner.
7. The method for cell voltage correction when collecting and balancing collinear in an active balancing BMS according to claim 5 or 6, wherein the software algorithm controlled measurements are applied to more than three battery packs.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114137415A (en) * | 2021-11-02 | 2022-03-04 | 广州小鹏汽车科技有限公司 | Method and device for detecting calorific value of battery pack, vehicle, and storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114137415A (en) * | 2021-11-02 | 2022-03-04 | 广州小鹏汽车科技有限公司 | Method and device for detecting calorific value of battery pack, vehicle, and storage medium |
| CN114137415B (en) * | 2021-11-02 | 2024-05-28 | 广州小鹏汽车科技有限公司 | Method and device for detecting heating value of battery pack, vehicle and storage medium |
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