WO2023060380A1 - 电芯采样电压的补偿方法、装置及用电装置 - Google Patents
电芯采样电压的补偿方法、装置及用电装置 Download PDFInfo
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- WO2023060380A1 WO2023060380A1 PCT/CN2021/123018 CN2021123018W WO2023060380A1 WO 2023060380 A1 WO2023060380 A1 WO 2023060380A1 CN 2021123018 W CN2021123018 W CN 2021123018W WO 2023060380 A1 WO2023060380 A1 WO 2023060380A1
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
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- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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- 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
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- 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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- H—ELECTRICITY
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
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- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
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- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
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- 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
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- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Definitions
- the present application relates to the field of batteries, in particular to a compensation method, device and electrical device for battery cell sampling voltage.
- lithium battery new energy vehicles need to connect multiple cells in series so that the entire battery pack is in a higher voltage range.
- the cells of the battery pack are grouped in such a way that multiple cells form a module, and multiple modules form a battery pack.
- the modules are connected by tabs. Due to the spatial structure of the battery pack between the modules, the length of the bridge between the modules will be long, so it is inevitable in the process of connecting the modules. A longer bar will be introduced. Due to the influence of the impedance of the bar, when a current passes through the battery pack, it will affect the voltage sampling of the battery cell by the voltage sampling device. Therefore, how to accurately obtain the sampling voltage of each battery cell in the battery pack is an urgent problem to be solved.
- the present application provides a compensation method, device and electrical device for battery cell sampling voltage, which can dynamically detect the battery cells that need voltage compensation without the need for special equipment, and according to the cross-module bar
- the impedance voltage of the chip compensates the cell sampling voltage.
- the present application provides a compensation method for battery cell sampling voltage, wherein the battery cell sampling voltage is measured by a voltage acquisition device, and the voltage acquisition device is electrically connected to a plurality of battery cells connected in series in a battery pack , the battery pack includes a plurality of modules, each module includes a plurality of batteries, at least one cross-module pad is connected to different modules in the battery pack, and is located in the sampling channel of the voltage acquisition device Among them, the method includes the following steps: after confirming that all the batteries connected to the voltage acquisition device are in a normal state, charge or discharge the battery pack with a preset current, and obtain The sampling voltage values of the plurality of batteries; according to the acquired sampling voltage values of the plurality of batteries, determine the batteries that need to be compensated for the sampling voltage in the plurality of modules, and calculate the cross-mode Impedance voltage of the assembly plate; perform sampling voltage compensation on the battery cell that needs to be voltage compensated according to the impedance voltage across the module plate.
- the battery pack when the battery pack is in a static state, it is detected whether each battery cell is in a normal state.
- the battery cells in the battery pack are normal, charge or discharge the battery pack by flowing a stable current, determine the position of the battery cells that need to be compensated for voltage and the impedance of the cross-module pads, and according to the cross-mode
- the impedance voltage of the assembly chip compensates the sampling voltage of the cell, so that the collected cell voltage is consistent with the actual voltage of the cell.
- charging or discharging the battery pack with a preset current includes: flowing the preset current through all cells in the battery pack for a predetermined time. By passing the preset current through all the cells in the battery pack for a predetermined time, the voltage of each cell in the battery pack and the average voltage of the cells in the module can be effectively detected, so that it is possible to accurately locate the need for sampling voltage compensation batteries.
- the preset current is a stable value during charging or discharging.
- determining the cells that need sampling voltage compensation includes: calculating the sampling voltage of each cell in the module and the average sampling voltage of all cells in the module The difference value is determined as the battery cell that needs to perform sampling voltage compensation with the difference value greater than the first preset threshold.
- calculating the impedance voltage across the modules of the module includes: calculating the sampling voltage of the cell that needs to be compensated for the sampling voltage and removing the cell that needs to be compensated for the voltage in the module. The difference between the average sampling voltages of the remaining cells, determine the impedance of the cross-module bar according to the difference and the preset current, and determine the impedance of the cross-module bar according to the current flowing through the cross-module bar and the cross-module The impedance of the pads is used to determine the impedance voltage across the pads of the module.
- the impedance of the cross-module patch is recorded, and the state of the cross-module patch is predicted according to the impedance of the cross-module patch recorded multiple times.
- the contact surface of the tabs will age and the fixing bolts will become loose.
- it also includes the step of judging whether the cell is in a normal state, wherein, when the battery pack is in a resting state, when the sampling voltage of each cell in the module is the same as that in the module When the difference between the average sampling voltages of all the cells is less than the second preset threshold, it is determined that all the cells in the module are in a normal state.
- wherein the battery pack is in a resting state includes: when the SOC of the battery pack is in a preset range, the current flowing through the battery pack is a resting current.
- the preset interval is that the SOC of the battery pack is between 30-80%.
- condition test flag bit of the battery pack is set to 1.
- condition test flag bit of the battery pack when the condition test flag bit of the battery pack is 1, it is determined whether all cells in the battery pack are in a normal state, if at least one cell is not in a normal state state, then the condition test flag bit of the battery pack is set to 0, and re-detects whether all the cells in the battery pack are in a normal state, and when it is determined that all the cells in the battery pack are in a normal state, set The condition test flag bit of the battery pack is reset to 1.
- all the cells in the battery pack are of the same type.
- the present application provides a compensation device for cell sampling voltage, including a memory and a processor, the memory stores a computer program, and the processor is used to: when executing the computer program, realize the above-mentioned Compensation method for cell sampling voltage.
- the battery pack and the above-mentioned compensating device for the sampling voltage of the cell the battery pack is used to provide electric energy.
- FIG. 1 is an electrical connection diagram of a battery system in some embodiments of the present application
- Fig. 2 is a schematic diagram of the connection mode between the voltage acquisition device and each battery cell when the battery pack of some embodiments of the present application contains cross-module chips;
- FIG. 3 is a flow chart of a cell sampling voltage compensation scheme in some embodiments of the present application.
- Fig. 4 is the variation diagram of the cell sampling voltage with time in the measured data of some embodiments of the present application.
- FIG. 5 is a block diagram of a cell sampling voltage compensation device in some embodiments of the present application.
- Fig. 6 is a block diagram of an electrical device according to some embodiments of the present application.
- multiple refers to more than two (including two), similarly, “multiple groups” refers to more than two groups (including two), and “multiple pieces” refers to More than two pieces (including two pieces).
- a power battery is a battery that provides a power source for an electrical device.
- the power battery may be a power storage battery.
- the power battery can be lithium ion battery, lithium metal battery, lead acid battery, nickel battery, nickel metal hydride battery, lithium sulfur battery, lithium air battery or sodium ion battery, etc., in the embodiment of this application is not specifically limited.
- the battery in the embodiment of the present application may be a battery cell/battery monomer, or a battery module or battery pack, which is not specifically limited in the embodiment of the present application.
- the electrical device may be a vehicle, ship, or spacecraft, which is not limited in this embodiment of the present application.
- the battery management system (Battery Management System, BMS) of the power battery is a control system that protects the safety of the power battery, and implements functions such as charge and discharge management, high voltage control, battery protection, battery data collection, and battery status evaluation.
- the battery cells of power batteries are usually grouped in such a way that multiple cells form a module, and multiple modules form a battery pack.
- the modules of the battery pack are connected by busbars.
- the tabs are formed in the form of rods or strips made of metal conductors, and are connected to the electrodes of the modules in the battery pack by means of screw bonding or the like.
- the length of the bridge between some modules is relatively long, and it is inevitable to introduce long tabs during the grouping process.
- the sampling channels of the voltage sampling device due to the influence of the chip impedance, when a current passes through the battery pack, it will affect the voltage sampling of the battery cells of the voltage sampling device.
- the voltage sampling channel is the channel between the two sampling terminals of the voltage sampling device.
- one sampling terminal of the voltage sampling device samples the voltage at the positive pole of the battery
- the other One sampling terminal samples the voltage at the negative pole of the battery
- the channel formed between each terminal of the two sampling terminals of the sampling device and the sampling device is a sampling channel.
- the first way is to test the impedance of the tabs between the modules when the battery pack is assembled.
- the management software in the battery management system makes a specific adjustment strategy, the voltage of the battery cell is compensated in combination with the current, that is, the voltage of the battery cell is compensated by calculating the voltage of the bar through Ohm's theorem.
- the disadvantage of the first method is: the impedance of the battery pack may become larger in the later stage of the life cycle of the battery pack, and the data at the beginning of the life cycle BOL (Begin of Life) cannot be fed back to the state at the end of the life cycle EOL (End of Life), resulting in The compensation data of the cell sampling voltage is inaccurate; in addition, it will take a lot of man-hours to test the impedance of each battery pack and write the management software.
- the second method is: some voltage sampling devices (such as sampling chips, which can be the analog front-end AFE (Analog Front End) chip, that is, the analog front-end chip completes the sampling function of the battery pack) support the voltage acquisition of the chip.
- the disadvantage of the second method is that the sampling chip needs more wire harness interface resource support, and the sampling chip can only use the chip that supports the wire harness interface function.
- the second method has relatively high requirements for the voltage sampling chip.
- the embodiments of the present invention provide a compensation method, device and electrical equipment for the sampling voltage of the battery cell.
- the position of the battery cell that needs voltage compensation and the impedance of the cross-module block are determined. Compensate the cell voltage collected by the position voltage sampling device, so that the collected cell voltage is consistent with the actual voltage of the cell.
- a battery system 1000 according to an embodiment of the present application is taken as an example for description.
- FIG. 1 is an electrical connection diagram of a battery system provided by some embodiments of the present application.
- the battery system 1000 includes a high-voltage control box BDU1100, a high-voltage fuse FUSE1300, a vehicle end 1200 and a battery pack 1400, wherein the battery pack 1400 contains four modules, respectively 1401, 1402, and 1403 and 1404, between the modules, the modules are connected by a bar, wherein the bar 1501 connects the module 1401 and the module 1402, the bar 1502 connects the modules 1402 and 1403, and the bar 1503 connects the module 1403 and the module 1404.
- Each module in the battery pack 1400 includes multiple battery cells connected in series, for example, each of the modules 1401 , 1402 , 1403 , and 1404 may include 8 battery cells connected in series.
- the interior of the high-voltage control box BDU1100 is composed of high-voltage relays, which are used to control the shutdown of the entire high-voltage circuit, and the high-voltage fuse FUSE1300 is used to disconnect the high-voltage circuit in extreme conditions such as short circuits.
- the modules in the battery pack are connected to the car end 1200 through BDU1100 and FUSE1300 to supply power for the car.
- the battery pack in Figure 1 may contain multiple modules, not limited to the four modules shown in Figure 1, and each module may also contain multiple Cells connected in series, and the number of cells in each module can be the same or different.
- FIG. 2 is a schematic diagram 2000 of the connection mode between the voltage acquisition device and each battery cell when the battery pack includes cross-module pads in some embodiments of the present application.
- Figure 2000 is a diagram of the connection mode in the battery pack 1400 including cross-module chips and a voltage sampling device
- Figure 2000 includes a voltage acquisition device 2001, a voltage sampling device 2002, and a voltage sampling device 2003, wherein the voltage sampling device
- the devices 2001, 2002 and 2003 can be AFE chips, which respectively sample the cells in the modules 1401, 1402, 1403 and 1404 of the battery pack.
- the voltage sampling device 2001 has sampling terminals S01-S09
- the voltage sampling device S2002 has a sampling terminal S2002. terminals S10-S19
- the voltage sampling device S2003 has sampling terminals S20-S34.
- the module 1401 includes cells C11-C18
- the module 1402 includes cells C22-C28
- the module 1403 includes cells C31-C38
- the module 1404 includes cells C41-C48.
- the bar 1501 is located between the modules 1401 and 1402
- the bar 1502 is located between the modules 1402 and 1403
- the bar 1503 is located between the modules 1403 and 1404 .
- the voltage acquisition device 2001, the voltage acquisition device 2002, and the voltage acquisition device 2003 obtain the sampling voltage of the cell by collecting the voltage between the positive pole and the negative pole of the battery cell of 1401, 1402, 1403, and 1404 in the module through the sampling terminal and calculating the difference,
- the voltage sampling device 2001 collects the sampling voltage of the battery cell C48 through the sampling terminals S01 and S02, that is, the sampling voltage of the battery cell C48 is: the sampling voltage value obtained from the positive pole of C48 through the sampling terminal S01 minus the sampling voltage obtained from the battery cell through the sampling terminal S02
- the sampling voltage value obtained by the negative pole of C48 is from the positive pole of C48 connected to the sampling terminal S01 to the negative pole of C48 connected to the sampling terminal S02.
- the paddle 1503 is located between the sampling terminal S09 of the voltage sampling device 2001 and the sampling terminal S10 of the voltage acquisition device 2002. Since the paddle 1503 is located in two different Between the voltage acquisition devices 2001 and 2002, the voltage of the battery cells in the module 1404 can be obtained directly through the voltage of the sampling terminals S01 to S09 and the sampling voltage of the sampling terminal S10, because all the sampling terminals of the voltage sampling device 2001 The sampling voltage of the sampling terminal S10 of the voltage sampling device 2002 can accurately obtain the sampling voltages of all the cells in the module 1404 , so no sampling voltage compensation is required for the cells in the module 1404 .
- the bar 1502 is located between the modules 1403 and 1402, and the bar 1502 is located between the sampling terminals S17 and S18 of the voltage sampling device 2002, that is, the voltage channel formed by the voltage sampling device 2002, the sampling terminal S17 and the sampling terminal S18 Between, when acquiring the sampling voltage of the cells in the modules 1403 and 1402, it is necessary to calculate the impedance voltage at the pad 1502 to compensate the sampling voltage of the cells.
- the impedance voltage of the chip 1502 needs to be considered, that is, the real voltage at the cell C31 is: (the sampled voltage value at the sampling terminal S17-the sampled voltage value at the sampled terminal S18)+(the chip 1502 Impedance value * current value flowing through the bar piece 1502), therefore, the bar piece 1502 is a cross-module bar piece, by obtaining the impedance voltage of the cross-module bar piece 1502 (that is, the impedance value of the bar piece 1502 * flowing through the bar piece 1502 current value) to compensate the sampled voltage of the cell C31 to obtain the real voltage at the cell C31.
- the above calculation of the true voltage of C31 is: (sampling voltage value at sampling terminal S17-sampling voltage value at sampling terminal S18)-(impedance value of bar 1502*flowing through bar 1502 current value).
- the bar 1501 is located between the sampling channels S25 and S26 of the voltage sampling device 2003.
- FIG. 3 is a flow chart 3000 of a cell sampling voltage compensation solution in some embodiments of the present application.
- the voltage sampling device (such as voltage sampling device 2001, voltage sampling device 2002 and voltage sampling device 2003) measure the sampling voltage of the batteries (such as C11-C18) contained in the battery pack (such as the battery pack 1400) in the module (such as the module 1401-1404), as shown in Figure 2, the voltage acquisition device (such as 2001 , voltage sampling device 2002 and voltage sampling device 2003) are electrically connected to battery cells (such as C11-C48) connected in series in a battery pack (such as battery pack 1400) through sampling ports (such as S01-S34), wherein the battery pack includes multiple
- Each module (such as battery pack 1400 includes modules 1401, 1402, 1403 and 1404), each module (such as 1401, 1402, 1403 and 1404) includes a plurality of batteries (C11-C48), across the module bar different modules in the battery pack (i.e.
- cross-module board 1501 connects modules 1401 and 1402, cross-module board 1502 connects modules 1402 and 1403), cross-mode
- the component bar (for example bar 1501 ) is located between the sampling channels of the voltage acquisition device (for example voltage acquisition device 2003 ).
- the chip 1501 is located between the sampling channels formed by the voltage acquisition device 2001, the sampling ports S25 and S25, and the cross-module chip 1502 is located between the sampling channels of the voltage acquisition device 2002, that is, the voltage acquisition device 2002, the sampling port S17 , Between the sampling channels composed of S18.
- the flowchart 3000 of the cell sampling voltage compensation scheme includes steps:
- a voltage acquisition device such as voltage sampling devices 2001, 2002, and 2003
- the sampled voltage value of the battery cell such as C11-C48
- the acquired sampling voltage value of the cell (such as C11-C48), determine the cell (such as C31 or C21 in FIG. 2 ) that needs sampling voltage compensation in the module (such as module 1401 or 1402) , and calculate the impedance voltage across the module pad (such as 1501 or 1502);
- 3004 Perform sampling voltage compensation on the battery cell (such as C31 or C21) that needs voltage compensation according to the impedance voltage across the module pads (such as 1501 or 1502).
- the battery pack (such as the battery pack 1400) is powered on by passing a stable current value through all the cells (such as the cells C11-C48) in the battery pack (such as the battery pack 1400) for a predetermined time Ts.
- the cells in 1400 are charged or discharged.
- the preset current I and the duration Ts need to be confirmed according to the characteristics of the battery cell.
- the preset current I is enough to meet more than one times the battery power. In the actual detection process, it should be confirmed according to the characteristics of different battery cells.
- the influence of the module pad on the voltage can be exposed, and the battery cell is fully polarized through the set time Ts.
- the polarization phenomenon is more stable.
- the preset current I value can be set to be greater than the current value flowing through the battery cell 1c in the battery pack for charging and discharging.
- the preset current I can be set to be greater than the current value of charging and discharging the battery cell capacity 1c of the battery pack, and the current value of 1c charging and discharging is the current value of the battery fully charged or fully discharged in 1 hour.
- the battery cell in the battery pack has a capacity of 200AH, then I can be set to ⁇ 200A.
- the I value needs to be stable during the test process. For example, according to the capacity of the single cell, it can be a stable 300A or a stable 350A. In the actual testing process, the general Ts is about 10s.
- the cell that needs to be compensated for the sampling voltage can be positioned and the influence of the cross-module chip on the sampling voltage can be calculated.
- the preset current I is a stable current value.
- the stable current value By setting the stable current value, it is convenient to accurately detect the voltage sampling value of each battery cell according to the voltage sampling device during the detection process.
- the battery cells that need to sample voltage in the module when compensating the battery cells that need to sample voltage in the module (such as module 1401 and module 1402), it is necessary to calculate the sampling voltage and The difference between the average sampling voltages of all the cells in the module is determined as the cell that needs to be compensated for the sampling voltage with the difference greater than the threshold.
- the battery pack (such as the battery pack 1400) with a preset stable current I
- the voltage Vcelln of each cell in the module according to the voltage of the voltage sampling device at the sampling end (or sampling point) (n represents the nth cell in the module, n starts from 1)
- Vcelln Whether the voltage difference ⁇ V1 from the average value Vavg2 of the battery cell sampling voltage in the module satisfies ⁇ V1>Y(mv), where Y is the first threshold, and the battery cell that meets this condition is considered to be a battery that needs sampling voltage compensation core.
- ⁇ V1 is greater than Y(mv)
- Y is the preset threshold value according to the experimental test
- Y I*R
- R is obtained according to the experimental test data
- the impedance value, such as R can be set to 0.05m ⁇ .
- the impedance voltage across the module bar is determined by the current flowing through the bar and the impedance R bar of the bar across the module, and the impedance voltage is used to compensate the cell that needs to be sampled and compensated the sampling voltage.
- the purpose of calculating the differential pressure is to eliminate the need to compensate the cell voltage and avoid introducing chip errors.
- the purpose is to more accurately calculate the average sampling voltage of the module, thereby determining the voltage difference ⁇ V2, thereby eliminating the need for compensation Cell voltage, to avoid the error of the chip voltage.
- the impedance R bar of the cross-module bar is recorded, and the state of the cross-module bar is predicted according to the impedance of the cross-module bar recorded multiple times.
- the software of the battery management system can record the impedance value of the cross-module tabs calculated each time, and compare the recorded impedance values of the cross-module tabs to confirm whether there is a trend of becoming larger, and then carry out the impedance calculation of the cross-module tabs. slice state prediction.
- the state of the pad may be the aging of the pad body and the contact surface of the pad, and the loosening of the fixing bolts.
- the fixing bolts of the pads are loose, the resistance will increase, because under the condition of non-human operation, the loosening of the bolts is a slow changing process, so the state of the pads can be detected by collecting the impedance value of the pads multiple times.
- the process of determining or judging whether the cells in the battery pack are in a normal state is as follows: when the battery pack is in a resting state, when the sampling voltage of each cell in the module is in the same state as the When the difference between the average sampling voltages of all the cells in the module is less than the preset threshold, it is determined that all the cells in the module are in a normal state.
- X is the preset threshold value
- X is the differential pressure value to confirm whether the battery cell is normal according to the characteristics of the battery cell in the battery pack.
- the threshold X can be used to filter out the abnormal voltage of the cells in the battery pack in the static state.
- X can generally be set to 50 (mv), and its setting should be confirmed according to the characteristics of different cells.
- the battery pack when the SOC of the battery pack is within a preset range, the battery pack is placed in a static state, that is, the current flowing through the battery pack in the static state is a static current, and the static current is usually for a smaller current value.
- the battery pack when the battery pack is in a static state, when there is no current or the current is relatively small, it is ensured that the polarization effect of the battery cell caused by the current subsides, and the voltage at this time is a normal static voltage.
- the quiescent current is less than 5A.
- 5A is a small quiescent current.
- a normal quiescent voltage value can be obtained, which is more conducive to judging the normal state of the battery.
- the SOC of the battery pack is between 30-80%, so that the battery pack is in a static state.
- the purpose is to ensure that the battery pack detects whether the battery cell is in a normal state under normal working conditions.
- the battery management system when all the cells in the battery pack are in a normal state, the battery management system sets the condition test flag of the battery pack to 1. Usually the condition detection flag for the battery pack is set in the software of the battery management system.
- condition condition test flag The purpose of setting the condition condition test flag is to make the battery management system directly confirm by detecting or setting the flag bit when operating the cells of the battery pack, so as to perform subsequent battery management operations.
- the software of the battery management system detects that the condition test flag bit of the battery pack is 1, it is determined whether all the cells in the battery pack are in a normal state, if at least one cell is not in a normal state, the The condition test flag bit of the battery pack is set to 0, and re-detects whether all the cells in the battery pack are in a normal state, and when it is determined that all the cells in the battery pack are in a normal state, reset the condition test flag bit of the battery pack to 1 .
- the impedance detection and calculation operations across the modules can be started.
- the battery management system By detecting the condition test flag in the battery pack during use and checking whether the battery cell is in a normal state, the battery management system is safer and more reliable when using the battery pack for subsequent operations.
- the batteries in the modules in the battery pack are of the same type.
- Table 1 is the measured data table of the battery pack according to the cell voltage compensation scheme.
- Table 1 lists the sampled voltage values of the battery packs in the actual test, taking cells N31-N40 as an example, over time.
- the table also includes the battery pack voltage, current, and cell voltage maximum and minimum values , and the SOC state of the battery;
- FIG. 4 also shows a graph 4000 of the variation of the cell sampling voltage versus time in the measured data.
- the voltage of the cells in the battery pack (line 174 of the table on the left in Figure 8) is at a stable level, and each cell and its battery pack module
- the condition test flag bit of the battery pack is set to 1.
- the number 1 in the first column of Table 1 indicates the internal design flag of the power management software. When the voltage consistency of the battery cell is high in the static state, the flag bit is set to 1, indicating that the correction can be triggered.
- Table 1 The measured data table of the battery pack according to the cell voltage compensation scheme
- the sampling voltage Vcell40 of the N40 cell is 3000mv
- Fig. 5 is a block diagram of a cell sampling voltage compensation device according to some embodiments of the present application.
- the cell sampling voltage compensation device 5000 of the present invention includes a memory 5100 and a processor 5200, the memory 5100 stores a computer program 5300, and the processor 5200 is used to: when executing the computer program, realize the above-mentioned Compensation method for cell sampling voltage.
- non-transitory computer and/or machine-readable media e.g., memory 5100 can be a hard drive, flash memory, read-only memory, optical disk, digital versatile disk, high-speed cache, random access memory and/or any other storage device or storage disk
- coded computer program 5300 for example, computer and/or machine readable instructions
- non-transitory Information stored in a computer and/or machine-readable medium for any period of time eg, for an extended period of time, persistent, ephemeral instances, temporary cache, and/or information cache.
- non-transitory computer-readable medium is expressly defined to include any type of computer-readable storage device and/or storage disk, and to exclude propagating signals and to exclude transmission media.
- the processor 5200 of the cell sampling voltage compensation device 5000 may also include a non-transitory computer-readable medium inside.
- Processor 5200 may be such as, but not limited to, one or more single-core or multi-core processors.
- the processor(s) may include any combination of general and special purpose processors (eg, graphics processors, application processors, etc.).
- the processor may be coupled thereto and/or may include a memory/storage device, and may be configured to execute instructions stored in the memory/storage device, so as to realize various functions running on the core sampling voltage compensation device 5000 of the present invention. application and/or operating system.
- Fig. 6 is a block diagram of an electrical device according to some embodiments of the present application.
- the electrical device 6000 includes a battery pack 6001 and the above-mentioned compensating device 5000 for the cell sampling voltage of the present invention.
- the battery pack includes multiple modules (such as 1401, 1402 and 1403), and each module contains multiple single cells (such as C11-C48).
- the electrical device is used to provide electrical energy.
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Abstract
Description
Claims (16)
- 一种电芯采样电压的补偿方法,其中,通过电压采集装置测量所述电芯采样电压,所述电压采集装置与电池包中串联连接的多个电芯电连接,所述电池包包括多个模组,每个模组中包括多个电芯,至少一个跨模组巴片连接所述电池包中不同的模组,并位于所述电压采集装置的采样通之间,所述方法包括以下步骤:在确认与所述电压采集装置所连接的所有电芯处于正常状态后,对所述电池包以预设电流进行充电或放电,通过所述电压采集装置获取所述多个电芯的采样电压值;根据所获取的所述多个电芯的采样电压值,在所述多个模组中确定需要进行采样电压补偿的电芯,并计算所述跨模组巴片的阻抗电压;根据所述跨模组巴片的阻抗电压对所述需要进行电压补偿的电芯进行采样电压补偿。
- 根据权利要求1所述的方法,其中,对所述电池包以预设电流进行充电或放电包括:在所述电池包中的所有电芯中流通所述预设电流并持续预定时间。
- 根据权利要求2所述的方法,其中,所述预设电流大于电芯1c充放电的电流值,其中所述1c充放电的电流值为电芯在1小时完全充满或者完全放电的电流值。
- 根据权利要求3所述的方法,其中所述预设电流在充电或放电过程中为稳定值。
- 根据权利要求1所述的方法,其中,在所述多个模组中确定需要进行采样电压补偿的电芯包括:计算模组内每个电芯的采样电压与该模组中所有电芯的平均采样电压的差值,将该差值大于第一预设的阈值的电芯确定为需要进行采样电压补偿的电芯。
- 根据权利要求5所述的方法,其中计算所述跨模组巴片的阻抗电压包括:计算所述需要进行采样电压补偿的电芯的采样电压与在模组中剔除该需要进行采用电压补偿的电芯后剩余电芯的平均采样电压的差值,根据该差值和所述预设电流确定所述跨模组巴片的阻抗,根据流过所述跨模组巴片的电流和所述跨模组巴片的阻抗来确定所述跨模组巴片的阻抗电压。
- 根据权利要求6所述的方法,记录所述跨模组巴片的阻抗,根据多次记录的所述跨模组巴片的阻抗来预测所述跨模组巴片的状态。
- 根据权利要求1所述的方法,还包括判断电芯是否处于正常状态的步骤,其中,在所述电池包处于静置状态时,当所述模组中每个电芯的采样电压与所述模组中所有电芯的平均采样电压的差值均小于第二预设的阈值时,确定所述模组中所有电芯处于正常状态。
- 根据权利要求8所述的方法,其中所述电池包处于静置状态包括:当所述电池包的SOC处于预设区间时,所述电池包的流通电流为静置电流。
- 根据权利要求9所述的方法,其中所述静置电流小于5A。
- 根据权利要求8所述的方法,所述预设区间为所述电池包的SOC在30-80%之间。
- 根据权利要求1所述的方法,其中,当所述电池包中所有电芯处于正常状态时,将所述电池包的条件测试标志位设置为1。
- 根据权利要求12所述的方法,在使用所述电池包时,当所述电池 包的条件测试标志位为1时,确定所述电池包中所有电芯是否处于正常状态,如果至少一个电芯不处于正常状态时,则将所述电池包的条件测试标志位设置为0,并重新检测所述电池包中所有电芯是否处于正常状态,当确定所述电池包中所有电芯处于正常状态时,将所述电池包的条件测试标志位重置为1。
- 根据权利要求1所述的方法,其中所述电池包中的所有电芯为相同类型的电芯。
- 一种电芯采样电压的补偿装置,包括存储器和处理器,所述存储器存储有计算机程序,所述处理器用于:当执行所述计算机程序时,实现如权利要求1-14任一项所述的方法。
- 一种用电装置,包括:电池包以及根据权利要求15所述的装置,所述电池包用于提供电能。
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PCT/CN2021/123018 WO2023060380A1 (zh) | 2021-10-11 | 2021-10-11 | 电芯采样电压的补偿方法、装置及用电装置 |
JP2023538072A JP7521125B2 (ja) | 2021-10-11 | 2021-10-11 | 電池コアサンプリング電圧の補償方法、装置及び電力消費装置 |
EP21960134.1A EP4250430A4 (en) | 2021-10-11 | 2021-10-11 | METHOD AND APPARATUS FOR COMPENSATING BATTERY CELL SAMPLING VOLTAGES, AND ELECTRICAL APPARATUS |
KR1020237020748A KR20230109724A (ko) | 2021-10-11 | 2021-10-11 | 배터리셀 샘플링 전압의 보상방법, 장치 및 전기기기 |
CN202180054547.8A CN116391286A (zh) | 2021-10-11 | 2021-10-11 | 电芯采样电压的补偿方法、装置及用电装置 |
US18/473,316 US20240061052A1 (en) | 2021-10-11 | 2023-09-25 | Battery cell sampling voltage compensation method and apparatus and electric apparatus |
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EP4250430A1 (en) | 2023-09-27 |
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KR20230109724A (ko) | 2023-07-20 |
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