WO2019042410A1 - Procédé et système d'égalisation de batterie, véhicule, support d'informations et dispositif électronique - Google Patents

Procédé et système d'égalisation de batterie, véhicule, support d'informations et dispositif électronique Download PDF

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WO2019042410A1
WO2019042410A1 PCT/CN2018/103525 CN2018103525W WO2019042410A1 WO 2019042410 A1 WO2019042410 A1 WO 2019042410A1 CN 2018103525 W CN2018103525 W CN 2018103525W WO 2019042410 A1 WO2019042410 A1 WO 2019042410A1
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Prior art keywords
value
soc
equalization
battery
load voltage
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PCT/CN2018/103525
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English (en)
Chinese (zh)
Inventor
罗红斌
王超
沈晓峰
曾求勇
刘苑红
张祥
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比亚迪股份有限公司
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Publication of WO2019042410A1 publication Critical patent/WO2019042410A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/20—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having different nominal voltages
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Definitions

  • the present application relates to the field of control technologies, and in particular, to a battery equalization method, system, vehicle, storage medium, and electronic device.
  • a vehicle power battery generally consists of a plurality of single cells connected in series to form a module. With the use of the battery, the difference between the individual cells gradually expands, and the consistency between the cells is poor. Due to the short board effect of the battery, the capacity of the battery pack is limited, so that the capacity of the battery pack cannot be fully exerted, resulting in the battery pack. The overall capacity is reduced. On the other hand, the gradual enlargement of the differences between the individual cells will cause over-charging of some single cells, over-discharge of some single cells, affecting battery life, damaging the battery, and possibly generating a large amount of heat to cause the battery. Burning or exploding.
  • the effective balanced management of the electric vehicle power battery is beneficial to improve the consistency of each battery in the battery pack, reduce the battery capacity loss, extend the service life of the battery and the driving range of the electric vehicle, which is of great significance.
  • the single battery that needs to be equalized is determined from the power battery pack, so the battery information of each single battery in the power battery pack needs to be collected in real time, and then according to the battery information. To determine which cells need to be balanced, and then equalize the cells that need to be balanced. Since the battery information of the single battery includes various types, such as load voltage value, SOC value, etc., the accuracy of different types of battery information in different situations is different, how to use the battery information of the single battery to improve the determination of the need to balance the single The accuracy of the body battery is a problem that needs to be solved.
  • a first aspect of the present application provides a battery equalization method, where the method includes:
  • determining, according to an interval in which the SOC value of at least one of the battery cells in the battery pack is located, using a SOC difference value or a load voltage difference value to determine a single cell that needs to be balanced including:
  • the reference SOC value is a minimum value of SOC values of respective single cells in the battery group; and determining the SOC value of the at least one single cell and a reference SOC value required for equalization
  • the SOC difference value includes: determining a SOC difference between the SOC value of the following single cell and the reference SOC value required for equalization:
  • the method further includes:
  • the first calculation manner is a manner in which the single battery calculates the SOC value last time.
  • a cell that needs to be equalized is a cell having a SOC difference in the at least one cell that is greater than or equal to the first equalization on threshold.
  • the equalization module is used to:
  • the unit cell is equalized according to the target equalization period of the unit cell.
  • the single cell that needs to be equalized is a single cell in which the load voltage difference in the at least one single cell is greater than or equal to the second equalization on threshold.
  • the reference load voltage value is a minimum value, a maximum value, or an average value of load voltage values of respective single cells in the battery pack.
  • control module is configured to:
  • the equalization module is used to:
  • the first calculation manner is an ampere-hour integration method or an ampere-hour integration combined with a voltage correction method
  • the second calculation method is an ampere-hour integration method and an ampere-hour integration combined with a voltage correction method and the first calculation Different ways of calculation.
  • control module is connected to an acquisition module and an equalization module corresponding to the same single cell through a channel, and the control module is configured to control when determining that the single battery connected to the control module does not need to be equalized.
  • the control module is connected to a corresponding sampling module; or
  • control module includes a control chip, and the control chip is respectively connected to an acquisition module and an equalization module corresponding to the same single cell through two pins, and the two pins are connected to the two channels. A correspondence.
  • a fourth aspect of the present application provides an electronic device, including:
  • One or more processors for executing a program in the computer readable storage medium.
  • a fifth aspect of the present application provides a vehicle including: a battery pack and the battery equalization system of the second aspect of the present application.
  • the SOC value of at least one of the battery cells in the battery pack is determined to adopt the SOC difference value.
  • the load voltage difference is used to determine the single cell that needs to be equalized, and the SOC value of at least one of the battery cells in the battery pack is at (0, SOC1), or at (SOC1, SOC2) or at (SOC2, 100%).
  • the battery parameter information with higher accuracy is used to determine the unit cells that need to be balanced, and the accuracy of determining the unit cells that need to be balanced is improved.
  • FIG. 1 is a schematic diagram of a battery equalization system according to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a battery equalization system in which two single cells share an equalization module according to an embodiment of the present application
  • FIG. 3 is a schematic diagram of a battery equalization system according to another embodiment of the present application.
  • FIG. 4 is a schematic diagram of a battery equalization system in which two single cells share an equalization module according to another embodiment of the present application;
  • FIG. 5 is a schematic flow chart of a battery equalization method according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a battery internal resistance model according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of an equalization module according to an embodiment of the present application.
  • the battery equalization system includes a control module 101, an acquisition module 102, an equalization module 103, and a battery pack 104.
  • each unit cell corresponds to one acquisition module 102 and one equalization module 103.
  • the acquisition module 102 and the equalization module 103 corresponding to the same single cell are respectively connected to the control module 101 through different control channels.
  • the control module may include a control chip, and the control chip is respectively connected to the acquisition module and the equalization module corresponding to the same single cell through two pins, and the two pins are in one-to-one correspondence with the two channels.
  • control module 101 controls the collection module 102 and the equalization module 103 to be turned on and off according to the unit cycle, respectively, to collect battery information and equalize the battery, so that battery information collection and equalization are performed in a time-sharing manner. Avoid the impact of equalizing current on the accuracy of battery information acquisition when battery information acquisition and equalization are performed simultaneously.
  • each of the cells in the battery is coupled to an acquisition module 102 and an equalization module 103, respectively. If the battery pack includes N single cells, there are N acquisition modules 102 and N equalization modules 103. Thus, the control module 101 passes through 2 ⁇ N control channels, respectively, with N acquisition modules and N equalization modules. connection.
  • control channel or channel described in the embodiment of the present application refers to a transmission path of the control command of the control module 101 to the execution end (the acquisition module 102 and the equalization module 103).
  • different single cells may share an equalization module, for example, N single cells in a battery pack, may share the same equalization module, or each preset number (eg, 2, 3, or 5 equal) single cells share an equalization module and the like.
  • the equalization module and each of the at least two single cells that need to be equalized are equalized during the equalization period of the unit period.
  • the batteries are connected alternately.
  • two single cells share an equalization module.
  • the equalization module is alternately connected with each cell during an equalization period of a unit cycle. Alternate connections may be alternate connections at a certain period. For example, referring to FIG. 2, when the parallel switch 150 on the parallel branch 15 corresponding to one of the two single cells 111 is closed for 2 s under the control of the control module 14, the other of the two cells The parallel switch 150 on the parallel branch 15 corresponding to the unit cell 111 is disconnected for 2 s under the control of the control module 14.
  • the parallel switch 150 on the parallel branch 15 corresponding to each of the two single cells, in the equalization period switches from the closed state to the open state every two seconds, or from the disconnected state. Switch to the closed state. Therefore, on the basis of the time-division of the acquisition module and the equalization module, during the equalization period, the single cells sharing the same equalization module are alternately connected with the shared equalization module to achieve equalization.
  • FIG. 3 is a schematic structural diagram of a battery equalization system according to another embodiment of the present application.
  • the battery equalization system includes a control module 301, an acquisition module 302, an equalization module 303, and a battery pack 304.
  • the battery pack 304 includes a plurality of unit cells connected in series.
  • the control module 301 is connected to the acquisition module 302 and the equalization module 303 corresponding to the same single cell through a control channel 305.
  • the control module is configured to connect the control control module to the corresponding sampling module when it is determined that the single battery connected to the control module does not need to be equalized; or the control module is further configured to determine the requirement of the single battery connected to the control module
  • the acquisition module and the equalization module time-multiplex the channel 305 according to the unit period.
  • One unit period includes: an acquisition period and an equalization period.
  • the control module 301 controls the acquisition module 302 to sample the battery information of the single battery during the collection period to obtain the battery information of the single battery.
  • the battery information includes at least one of the following: voltage, current, temperature, and the like.
  • the battery information may include only voltage values, whereby voltage performance parameters of the single battery may be obtained.
  • the battery information may also include a voltage value, a current value, a temperature value, and the like, thereby obtaining performance parameters such as SOC, internal resistance, and self-discharge rate of the unit battery.
  • the control module 301 determines, according to the battery information of the single battery collected by the collection module 302, the cell to be equalized that needs to be balanced.
  • the control module 301 controls an equalization module corresponding to the to-be-equalized unit cell to balance the cells to be equalized during the equalization period.
  • the acquisition module and the equalization module share the same control channel, and the control module controls the acquisition module and the equalization module, and the control channel is time-multiplexed according to the unit period, thereby avoiding battery information collection and equalization.
  • the control module controls the acquisition module and the equalization module, and the control channel is time-multiplexed according to the unit period, thereby avoiding battery information collection and equalization.
  • the influence of the equalization current on the accuracy of the battery information collection on the other hand, compared with the embodiment shown in FIG. 1 above, the number of channels of the control module chip is reduced, and the hardware cost can be saved.
  • a switch K is provided in the control channel shared by the acquisition module and the equalization module.
  • the control module 301 is connected to the switch K, and the time-sharing is connected to the acquisition module 302 or the equalization module 303 by controlling the switch K.
  • the control module 301 controls the acquisition module 302 to collect battery information for the single battery during the collection cycle.
  • the control module 301 controls the equalization module 303. The corresponding single cells are equalized.
  • different single cells may share an equalization module, for example, N single cells in a battery pack, may share the same equalization module, or each preset number (eg, 2, 3, or 5 equal) single cells share an equalization module and the like.
  • the equalization module and each of the at least two single cells that need to be equalized are equalized during the equalization period of the unit period.
  • the batteries are connected alternately.
  • an exemplary schematic diagram of sharing an equalization module for two single cells is shown.
  • the equalization module is alternately connected with each unit cell during the equalization period of the unit period. Alternate connections may be alternate connections at a certain period. Therefore, on the basis of the time-division of the acquisition module and the equalization module, during the equalization period, the single cells sharing the same equalization module are alternately connected with the shared equalization module to achieve equalization.
  • the battery equalization method according to an embodiment of the present application includes:
  • step S51 the SOC value of at least one of the battery cells in the battery pack is acquired.
  • the method of calculating the SOC value includes a first calculation mode and a second calculation mode, the first calculation mode corresponding to the interval (0, SOC1) and the interval (SOC2, 100%), the second calculation The mode corresponds to the interval (SOC1, SOC2);
  • step S51 includes:
  • the first calculation manner is a manner in which the single battery calculates the SOC value last time.
  • the first calculation manner is an ampere-hour integration method or an ampere-hour integration combined with a voltage correction method
  • the second calculation method is an ampere-hour integration method and an ampere-hour integration combined with a voltage correction method and the first calculation Different ways of calculation.
  • the ampere-hour integral method refers to the SOC value of the single-cell battery obtained by integrating the current value of the collected single-cell battery with time; the ampere-hour integral combined with the voltage correction method first calculates the SOC value of the single-cell battery by using the ampere-hour integral method. Then, the calculated SOC value is corrected by the load voltage value of the single cell, and the corrected SOC value is used as the final SOC value of the single cell.
  • FIG. 6 is a schematic diagram of the OCV-SOC curve of the single battery.
  • the variation of the OCV value of the single cell is small. Therefore, the SOC value of the single cell cannot be accurately calculated by using the OCV value during the OCV platform period, and thus the cell that needs to be balanced cannot be accurately determined.
  • the OCV value is an open circuit voltage value of the single cell, which is different from the load voltage value.
  • the battery internal resistance model is used, and the single battery is equivalent to an ideal voltage source in series with the resistor R. Then, for a single cell, the sampled voltage value V L (ie, the load voltage value) of the single cell can be converted into an open circuit voltage value according to formula (1):
  • V L is a load voltage value collected by the acquisition module during the acquisition period
  • I is a discharge current or a charging current collected by the acquisition module during the acquisition period
  • R is an internal resistance value of the single battery.
  • the voltage collected at the moment when the cell to be balanced stops working and reaches a steady state, or the battery just starts to work is itself an open circuit voltage or can be approximated as an open circuit voltage, so in this case
  • the OCV value of the unit cell to be equalized can be directly collected.
  • the internal resistance of the single cell can be preset.
  • the internal resistance of the unit cell may be determined based on the voltage and capacity of the unit cell.
  • the internal resistance value of the unit cell is determined according to the correspondence relationship between the voltage, the capacity, and the internal resistance value of the unit cell.
  • other battery models such as Thevenin model, PNGV (Partnership for a New Generation of Vehicles) model, etc., can be used to convert the load voltage of the collected single cells. Is the open circuit voltage.
  • OCV value load voltage value + battery internal resistance * battery charging current or discharge current
  • the internal resistance of the battery and the battery charging current or discharge current are constant. Therefore, the difference between the OCV value and the load voltage value is also constant. When the variation of the OCV value is small, the variation of the load voltage value is constant. Also small.
  • the present application proposes that the SOC value is not calculated by the ampere-hour integral combined with the voltage correction method during the OCV platform period, and the SOC value is calculated by the ampere-hour integral method, thereby avoiding the adoption of the OCV platform period.
  • the time integral combined with the voltage correction method calculates the SOC value and causes the calculated SOC value to be inaccurate.
  • the present application also considers that the OCV value varies greatly during the non-OCV platform period.
  • the OCV value of the single cell changes in the [0, SOC1] and [SOC2, 100%] intervals. Larger range. Therefore, in the non-OCV platform period, the calculation using the ampere-hour integral combined with the voltage correction method is more accurate. Therefore, this application proposes to calculate the SOC value of the single cell using the ampere-hour integral and voltage correction method during the non-OCV platform period.
  • the application divides the range of the SOC value of the single battery into three intervals: the first interval, the second interval, and the third interval, and the second interval is the OCV platform period corresponding to
  • the SOC section is, for example, the [SOC1, SOC2] section in FIG. 6; the first section and the third section are SOC sections corresponding to the non-OCV platform period, such as the [0, SOC1] section and [SOC2, 100 in FIG. %].
  • the embodiment of the present application proposes that the SOC value of the single battery is calculated by the ampere-hour integration method in the SOC interval corresponding to the OCV platform period, and the SOC value of the single battery is calculated by using the ampere-hour integral and the voltage correction method in the SOC interval corresponding to the non-OCV platform period.
  • the OCV is an Open Circuit Voltage and the SOC is a State of Charge.
  • the SOC value of the battery can be calculated by adjusting the real-time voltage of the battery (in this case, the load voltage).
  • the rate of change of the battery voltage is small, and the accuracy of calculating the SOC value by introducing the voltage variable is not high, so the SOC value can be directly calculated by the ampere-time integration method.
  • the battery SOC value can also be calculated by using an open circuit voltage method, that is, the voltage value of the battery is collected (the equivalent is an open circuit voltage value), and the OCV-SOC correspondence can be checked. Calculate the battery SOC value.
  • the SOC value of the single cell is calculated by using any one of the hourly integration method and the ampere-hour integration combined with the voltage correction method, and the calculation method adopted at this time is the first calculation. the way. Then, it is determined whether the calculated SOC value belongs to the SOC interval corresponding to the OCV platform period. If the calculated SOC value does not belong to the SOC interval corresponding to the OCV platform period, the calculated SOC value belongs to the SOC interval corresponding to the non-OCV platform period.
  • the SOC value of the single cell is recalculated according to the ampere-hour integral combined with the voltage correction method, optionally, in this case, If the SOC value of the single battery is calculated again, the ampere-hour integral combined with the voltage correction method may be used as the first calculation mode; if the calculated SOC value belongs to the SOC interval corresponding to the OCV platform period, the calculated SOC value is accurate. There is no need to recalculate the SOC value of the single battery. Alternatively, in this case, if the SOC value of the single battery is calculated again, the ampere-hour integration method can be used as the first calculation method.
  • the calculated SOC value belongs to the SOC interval corresponding to the non-OCV platform period, and if the calculated SOC value does not belong to the SOC interval corresponding to the non-OCV platform period, the calculated SOC value belongs to the SOC corresponding to the OCV platform period.
  • the embodiment of the present application proposes to first obtain the SOC value of at least one single battery in the battery group, and then determine the at least one single according to the SOC value of at least one single battery in the battery group.
  • the SOC value of the body battery belongs to which of the three intervals (0, SOC1), (SOC1, SOC2) and (SOC2, 100%), and then determines whether the SOC difference or the load voltage difference is selected to determine the need for equalization.
  • Single battery
  • the number of the components is greater than or equal to the first preset value (for example, the single cell in the battery pack)
  • the first preset value for example, the single cell in the battery pack
  • the number of SOC values belonging to (SOC1, SOC2) is greater than or equal to a second preset value (for example, 1/2 of the total number of single cells in the battery pack), It is determined that the SOC difference is used to determine the cell that needs to be equalized.
  • the number of SOC values belonging to (SOC2, 100%) is greater than or equal to a third preset value (for example, 1/3 of the total number of single cells in the battery pack) Determine the load voltage difference to determine the cell that needs to be balanced.
  • the reference SOC value may be the SOC value of any one of the battery cells in the battery pack, for example, the SOC value of the single battery cell having the largest SOC value in the battery pack, or the minimum SOC value in the battery pack.
  • the SOC value of the unit cell, or the SOC value of the unit cell in which the SOC value in the battery pack is in the middle in the case where the battery pack includes an odd number of unit cells.
  • the SOC difference value includes: a SOC difference between the SOC value of the following single cell and the reference SOC value required for the equalization judgment:
  • the method further comprises: controlling the at least one The single cell in the single cell is charged with a SOC difference greater than or equal to the first equalization on threshold.
  • the SOC value of each of the single cells in the battery pack may be made different from the reference SOC value, thereby determining each of the battery packs. Whether the single cell is a single cell that needs to be balanced.
  • This embodiment is a batch judgment method, and can determine at a time whether each single battery in the battery pack is a single battery that needs to be balanced.
  • the process of equalizing the cells that need to be equalized is: whether the battery pack is in a charged state or a discharged state,
  • the single cell in the bulk battery with the SOC value greater than the average value adopts passive equalization, and discharges the single cell in which the SOC value of the single cell that needs to be equalized is greater than the average value; and the SOC value in the single cell that needs to be equalized is less than
  • the single cells of the average value are all actively balanced, and the single cells in which the SOC value is smaller than the average value in the cell to be balanced are charged.
  • the single cell that needs to be equalized is a single cell in which the load voltage difference in the at least one single cell is greater than or equal to the second equalization on threshold.
  • the reference load voltage value required for the equalization judgment is similar to the description of the reference SOC value required for the equalization judgment, and the reference load voltage value may be the load voltage value of any single battery in the battery pack.
  • the load voltage value of the single battery with the highest load voltage value in the battery pack or the load voltage value of the single battery with the smallest load voltage value in the battery pack, or the single middle of the load voltage value in the battery pack.
  • the load voltage value of the body battery for the case where the battery pack includes an odd number of single cells).
  • the reference load voltage value may also be calculated according to the load voltage value of each single battery in the battery pack, for example, the average value of the load voltage values of the individual cells in the pool group, or the load voltage value row in the battery pack.
  • the average value of the load voltage values of the two cell batteries in the middle for the case where the battery pack includes an even number of cells.
  • the second equalization on threshold may be the same as or different from the first equalization on threshold. Both are thresholds for determining whether to turn on equalization of any of the battery cells in the battery pack, that is, a threshold for determining whether any of the battery cells in the battery pack is a single cell requiring equalization.
  • At least one single cell is selected from the battery pack, and then the load voltage value of the selected at least one single cell is made to be different from the reference load voltage value to obtain a load voltage difference of the selected at least one single cell. Then, the obtained load voltage difference is compared with the second equalization on threshold. If the load voltage difference of one single cell is greater than or equal to the second equalization on threshold, the battery is a single cell that needs to be balanced; If the load voltage difference of the body battery is less than the second equalization on threshold, the battery is a single cell that does not need to be balanced.
  • the reference load voltage value is different, and at least one of the selected single cells is different, and the process of equalizing the cells that need to be balanced is different.
  • the reference load voltage value is the minimum value, the maximum value, and the average value among the load voltage values of the respective unit cells in the battery pack.
  • the load voltage difference between the values includes: determining a load voltage difference between a load voltage value of the following single cell and a reference load voltage value required for equalization determination:
  • the battery cell has a battery cell other than the single cell in which the load voltage value is the minimum value.
  • the method further comprises: controlling the at least A single cell in which a load voltage difference in a single cell is greater than or equal to the second equalization on threshold is discharged.
  • the reference load voltage value is the minimum value among the load voltage values of the respective single cells in the battery pack
  • only the load voltage value of the single cell having the largest load voltage value in the battery pack and the reference load voltage may be used.
  • the value is poor, and it is determined whether the single cell in the battery pack having the largest load voltage value is a single cell that needs to be balanced.
  • Such an embodiment can only determine if a single cell requires equalization.
  • the load voltage of the other battery cells other than the single battery cell having the smallest load voltage value in the battery pack may be further The value is compared with the reference load voltage value to determine whether the other battery cells in the battery pack other than the single cell having the smallest load voltage value are the single cells that need to be balanced.
  • This embodiment is a batch judgment method, and can determine at a time whether the single battery other than the single battery having the smallest load voltage value in the battery pack is a single battery that needs to be balanced.
  • the load voltage difference between the values includes: determining a load voltage difference between a load voltage value of the following single cell and a reference load voltage value required for equalization determination:
  • the method further comprises: controlling the at least A single battery in which a load voltage difference in a single cell is greater than or equal to the second equalization turn-on threshold.
  • the load voltage value of the single cell that minimizes the load voltage value in the battery pack and the reference load voltage may be The value is poor, and it is determined whether the single cell in the battery pack having the smallest load voltage value is a single cell that needs to be balanced. Such an embodiment can only determine if a single cell requires equalization.
  • the load voltage of the other battery cells other than the single battery cell having the largest load voltage value in the battery pack can also be used.
  • the value is compared with the reference load voltage value to determine whether the other battery cells in the battery pack other than the single cell having the smallest load voltage value are the single cells that need to be balanced.
  • This embodiment is a batch judgment method, and can determine at a time whether the single battery other than the single battery having the largest load voltage value in the battery pack is a single battery that needs to be balanced.
  • the difference between the load voltages includes determining a load voltage difference between a load voltage value of each of the battery cells in the battery pack and the reference load voltage value.
  • the method further includes:
  • the method further includes:
  • the equalization of the unit cells is controlled in accordance with the target equalization period of the unit cells.
  • the target equalization time of the unit to be equalized is determined according to the load voltage value of the unit to be balanced and the reference load voltage value, and is not limited to the following three determination manners:
  • the determining, according to the reference load voltage value and the open circuit voltage OCV-remaining power SOC curve of the battery group, determining a first SOC value corresponding to the reference load voltage value including: loading the battery pack The single cell having the smallest difference between the voltage value and the reference load voltage value is determined as a reference battery; determining a reference OCV value of the reference battery according to a load voltage value of the reference battery and an internal resistance value of the reference battery; Determining, according to the reference OCV value and the OCV-SOC curve, a SOC value corresponding to the reference OCV value as the first SOC value;
  • Determining the to-be-balanced according to a load voltage difference between the load voltage value of the to-be-equalized cell and the reference load voltage value, and a correspondence between a preset load voltage difference and a target equalization time The target equalization time of the single battery.
  • the correspondence between the load voltage difference and the target equalization time is obtained by measurement. After obtaining the load voltage difference between the load voltage value of the unit cell to be equalized and the reference load voltage value, the correspondence between the load voltage difference value and the target equalization time length is queried, and the target equalization time length can be determined.
  • the equalization module when the generator 92 is an alternator, the equalization module further includes a rectifier 93 in series with the generator 92, each of the charging branches 130 being connected in series with the rectifier 132. After the alternating current generated by the generator 92 is converted to direct current by the rectifier 93, the generator 92 can be enabled to charge the individual cells to be equalized.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne un procédé d'égalisation de batterie, consistant à : obtenir une valeur d'état de charge d'au moins une cellule d'un bloc-batterie; déterminer, en fonction de la valeur d'état de charge de la ou des cellules du bloc-batterie ainsi que de trois intervalles (0, SOC1), (SOC1, SOC2) et (SOC2, 100 %), l'intervalle où est située la valeur d'état de charge de la ou des cellules; et déterminer, selon l'intervalle où est située la valeur d'état de charge de la ou des cellules, d'utiliser une différence d'état de charge ou une différence de tension de charge pour déterminer une cellule devant être égalisée. Pour le cas où la valeur d'état de charge d'au moins une cellule d'un bloc-batterie se trouve dans un intervalle (0, SOC1), (SOC1, SOC2) ou (SOC2, 100 %), des informations de paramètre de batterie avec une précision relativement élevée peuvent être utilisées pour déterminer une cellule devant être égalisée, et par conséquent, le procédé améliore la précision de détermination de la cellule devant être égalisée. L'invention concerne également un système d'égalisation de batterie, un véhicule, un support d'informations et un dispositif électronique.
PCT/CN2018/103525 2017-08-31 2018-08-31 Procédé et système d'égalisation de batterie, véhicule, support d'informations et dispositif électronique WO2019042410A1 (fr)

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