WO2015154381A1 - Procédé et système de détection de niveau de charge de batterie et batterie - Google Patents

Procédé et système de détection de niveau de charge de batterie et batterie Download PDF

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Publication number
WO2015154381A1
WO2015154381A1 PCT/CN2014/086661 CN2014086661W WO2015154381A1 WO 2015154381 A1 WO2015154381 A1 WO 2015154381A1 CN 2014086661 W CN2014086661 W CN 2014086661W WO 2015154381 A1 WO2015154381 A1 WO 2015154381A1
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value
battery
power
circuit voltage
current
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PCT/CN2014/086661
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English (en)
Chinese (zh)
Inventor
张健
王蕾
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中兴通讯股份有限公司
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Publication of WO2015154381A1 publication Critical patent/WO2015154381A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • 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
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • 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 invention relates to the field of battery technologies, and in particular, to a battery capacity detecting method, system, and battery.
  • the terminal battery capacity detection generally adopts the following method: detecting the current flowing in and out of the battery, and using the battery voltage and temperature as auxiliary conditions, and completing the power conversion through the terminal.
  • the method needs to obtain the capacity of the battery to be tested in advance, and the percentage of the current battery power can be obtained according to the ratio between the power detected by the mobile phone conversion and the capacity of the battery to be tested.
  • the prior art has the following deficiencies: First, the power of the battery is generally judged by the voltage at the time of starting up, and the error is large, especially when the low voltage is charged, the virtual power is more, and the error is larger; the second is that only the battery of the specified capacity can be detected. Unable to detect batteries of unknown capacity, the versatility of existing battery capacity detection methods is poor.
  • the main object of the present invention is to solve the technical problem that the existing battery power detecting method has large error and poor versatility.
  • the present invention provides a battery power detecting method, the battery power detecting method comprising the steps of: acquiring a first power value of a battery, and determining a battery current value and a second power value according to the first power value; After the preset time interval, recalculating the first power value according to the preset time interval, and the determined battery current value and the second power value; re-determining the first power value according to the current calculation a battery current value and a second power value; determining a battery power indicator value according to the currently calculated second power value.
  • the step of determining the power indicator value of the battery according to the currently calculated second power value further comprises: determining whether a termination instruction is received, and if not, continuing to sequentially perform the step of recalculating the first power value And subsequent steps until a termination command is received.
  • the step of re-determining the battery current value and the second power value according to the currently calculated first power value comprises: mapping according to a preset battery power value, an open circuit voltage value, and an internal resistance value Determining a first open circuit voltage value and an internal resistance value corresponding to the currently calculated first power value; acquiring a closed circuit voltage value of the battery, according to the closed circuit voltage value, and the currently calculated first open circuit voltage value and internal resistance Recalculating the battery current value and calculating a second open circuit voltage value; determining a second corresponding to the second open circuit voltage value according to a mapping relationship between a preset battery power value, an open circuit voltage value, and an internal resistance value Electricity value.
  • the step of recalculating the battery current value according to the closed circuit voltage value and the currently calculated first open circuit voltage value and the internal resistance value, and calculating the second open circuit voltage value comprises: according to the closed circuit voltage And recalculating the battery current value according to the currently calculated first open circuit voltage value and the internal resistance value; and using the closed circuit voltage based on a mapping relationship between a preset battery power value, an open circuit voltage value, and an internal resistance value The value is used as the open circuit voltage value to determine a corresponding internal resistance value in the mapping relationship, to re-determine the current internal resistance value of the battery, and calculate the second according to the closed circuit voltage value and the currently calculated battery current value and internal resistance value. Open circuit voltage value.
  • the step of determining the power indicator value of the battery according to the currently calculated second power value comprises: determining that the battery is in a charging state or a discharging state; when the battery is in a charging state, and when the recalculating second power value
  • the current power indicator value of the battery is greater than the current power indicator value
  • the first preset value is increased
  • the battery is in the discharging state
  • the recalculated second power value is less than the battery current indicator
  • the current preset value is decreased by a second preset value.
  • the battery power detecting method further includes the following steps: when the battery is in a charging state, and the current second power value is less than the preset power value, calculating the battery according to the preset time interval and the battery current value corresponding to the time interval. The battery charge value is charged in the time interval, and the battery charge value is charged in each time interval until the battery is full, and the battery capacity value is updated according to the accumulated charge battery charge value.
  • the present invention further provides a battery power detecting system, the battery power detecting system comprising: a first calculating module, configured to acquire a first power value of the battery, and determine according to the first power value a battery current value and a second power value; the second calculating module is configured to recalculate the first time according to the preset time interval, and the determined battery current value and the second power value after a preset time interval The first calculation module is further configured to re-determine the battery current value and the second power value according to the currently calculated first power value; and the determining module is configured to determine the battery according to the currently calculated second power value. Battery indicator value.
  • the battery power detecting system further comprises: a loop control module configured to determine whether a termination command is received, and if not, controlling the first computing module, the second computing module, and the determining module to operate.
  • a loop control module configured to determine whether a termination command is received, and if not, controlling the first computing module, the second computing module, and the determining module to operate.
  • the first calculating module includes: a first calculating unit configured to determine, according to a preset mapping relationship between a battery power value, an open circuit voltage value, and an internal resistance value, a current calculated first power value a first open circuit voltage value and an internal resistance value; the second calculating unit is configured to obtain a closed circuit voltage value of the battery, and recalculate the method according to the closed circuit voltage value and the currently calculated first open circuit voltage value and the internal resistance value a battery current value, and calculating a second open circuit voltage value; the third calculating unit is configured to determine, according to a preset mapping relationship between the battery power value, the open circuit voltage value, and the internal resistance value, the second open circuit voltage value The second amount of electricity.
  • the determining module includes: a determining unit configured to determine that the battery is in a charging state or a discharging state; the first adjusting unit is configured to when the battery is in a charging state, and when the recalculated second power value is greater than When the current power indicator value of the battery is described, the current power indicator value is increased by a first preset value; the second adjusting unit is set to when the battery is in a discharging state, and when the recalculated second power value is less than the When the current battery indicator value is used, the current battery indicator value is decreased by a second preset value.
  • the battery power detecting system further includes a capacity update module, the capacity update module is configured to: when the battery is in a charging state, and the current second power value is less than the preset power value, according to the preset time interval and the time
  • the battery current value corresponding to the interval calculates the power value charged in the battery during the time interval, and accumulates the power value of the battery in each time interval after the accumulation, until the battery is full, and is updated according to the accumulated charge value of the battery The capacity value of the battery.
  • the present invention further provides a battery
  • the battery includes a battery power detecting system
  • the battery power detecting system includes: a first calculating module, configured to acquire a first power value of the battery, according to the The first power value determines a battery current value and a second power value; the second calculating module is configured to, after the preset time interval, based on the preset time interval, and the determined battery current value and the second power value Recalculating the first power value; the first calculating module is further configured to re-determine the battery current value and the second power value according to the currently calculated first power value; the determining module is set to be based on the current calculation The second battery value determines the battery power indicator value.
  • the battery power detecting method of the present embodiment recalculates the first power value based on the preset time interval, the battery current value and the second power value at the previous time after the preset time interval, and obtains the current power value according to the current calculation.
  • the first power value re-determines the battery current value and the second power value, and finally determines the battery power indication value according to the currently calculated second power value, thereby improving the accuracy of the battery power detection, in the case where the battery capacity is unknown, Battery power detection is also possible, and the versatility is high.
  • FIG. 1 is a schematic flow chart of a first embodiment of a battery power detecting method according to the present invention
  • FIG. 2 is a schematic diagram showing the refinement process of an embodiment of step S10 in FIG. 1;
  • step S12 in FIG. 2 is a schematic diagram showing the refinement process of an embodiment of step S12 in FIG. 2;
  • step S30 in FIG. 1 is a schematic flow chart of an embodiment of step S30 in FIG. 1;
  • FIG. 5 is a schematic diagram showing the refinement process of an embodiment of step S32 in FIG. 4;
  • FIG. 6 is a schematic diagram of a refinement process of an embodiment of step S40 in FIG. 4;
  • FIG. 7 is a schematic flow chart of a second embodiment of a battery power detecting method according to the present invention.
  • FIG. 8 is a schematic diagram of functional modules of a first embodiment of a battery power detecting system according to the present invention.
  • FIG. 9 is a schematic diagram of a refinement function module of an embodiment of the first computing module of FIG. 8;
  • FIG. 10 is a schematic diagram of a refinement function module of an embodiment of the second computing unit of FIG. 9;
  • FIG. 11 is a schematic diagram of a refinement function module of an embodiment of the determining module of FIG. 8;
  • FIG. 12 is a schematic diagram of functional modules of a second embodiment of a battery power detecting system according to the present invention.
  • FIG. 13 is a schematic diagram of functional modules of a third embodiment of a battery power detecting system according to the present invention.
  • the invention provides a battery power detecting method.
  • FIG. 1 is a schematic flow chart of a first embodiment of a battery power detecting method according to the present invention.
  • the battery power detecting method includes:
  • Step S10 obtaining a first power value of the battery, and determining a battery current value and a second power value according to the first power value;
  • the battery is generally pre-charged with a certain amount of power when leaving the factory, and the pre-stored power value may be pre-stored in the battery before leaving the factory, and the first power value may be a pre-stored power value.
  • the first power value may also be the current actual remaining power value of the battery, and the current battery remaining power value may be calculated according to the following embodiment.
  • step S10 includes:
  • Step S11 Obtain a first power value of the battery, and determine, according to a mapping relationship between the preset battery power value, the open circuit voltage value, and the internal resistance value, the first open circuit voltage value corresponding to the obtained first power value and the internal value. Resistance value.
  • a mapping relationship between the battery power value, the open circuit voltage value and the internal resistance value such as a function or a correspondence table, may be established in advance. Since the temperature also has a certain influence on the mapping relationship between the battery power value, the open circuit voltage value, and the internal resistance value, in this embodiment, first, a temperature, a battery power value, an open circuit voltage value, and an internal resistance value are established. Correspondence table. For example, a correspondence table between the battery power value, the open circuit voltage value, and the internal resistance value at -10 degrees, 0 degrees, 25 degrees, and 50 degrees can be created separately.
  • the battery power value may be the remaining power value of the battery.
  • the battery power value in the correspondence table is a ratio between the battery remaining power value and the battery capacity, as described below.
  • the first power value, the second power value, and the remaining power value are all expressed as a percentage value.
  • a table corresponding to two similar temperatures is selected in the above correspondence table for linear interpolation, and a correspondence table between the battery power value, the open circuit voltage value and the internal resistance value at the current temperature is prepared.
  • the correspondence table corresponding to 0 degrees and 25 degrees is selected, and the two correspondence tables are linearly interpolated to obtain a correspondence table corresponding to 15 degrees.
  • the closed circuit voltage CV of the battery is obtained, and the first electric quantity value is set to Q1.
  • the first open circuit voltage value OCV1 and the internal resistance value R1 of the battery are obtained according to the first electric quantity value Q1.
  • Step S12 acquiring a closed circuit voltage value of the battery, calculating a battery current value according to the closed circuit voltage value, the determined first open circuit voltage value and the internal resistance value, and calculating a second open circuit voltage value;
  • step S12 includes:
  • Step S121 calculating a battery current value according to the closed circuit voltage value and the determined first open circuit voltage value and internal resistance value.
  • Step S122 determining a corresponding internal resistance value in the mapping relationship by using the closed circuit voltage value as an open circuit voltage value to determine a mapping relationship between the preset battery power value, the open circuit voltage value, and the internal resistance value.
  • the current internal resistance value of the battery is calculated according to the closed circuit voltage value, and the currently calculated battery current value and internal resistance value.
  • the closed circuit voltage can be used as the open circuit voltage to query the corresponding relationship table to obtain the corresponding internal resistance value, closed circuit voltage and open circuit voltage.
  • the difference is small, and the difference in the internal resistance value corresponding to the relation table is also small. Therefore, it is more accurate to query the internal resistance value of the battery with the actually measured closed circuit voltage.
  • the re-determined battery internal resistance be R2
  • the second open circuit voltage OCV2 of the battery can be obtained as:
  • Step S13 Determine a second power value corresponding to the second open circuit voltage value based on a mapping relationship between the preset battery power value, the open circuit voltage value, and the internal resistance value.
  • the second power value Q2 corresponding to the second open circuit voltage OCV2 is determined.
  • Step S20 after the preset time interval, recalculate the first power value according to the preset time interval, and the determined battery current value and the second power value;
  • the preset time interval may be set according to actual needs. In order to ensure the accuracy of the power detection, the preset time interval should not be too large. For example, in this embodiment, the preset time interval may be taken as 10 seconds. In other embodiments, the preset time interval may also be 5 seconds, 15 seconds, or 20 seconds, etc., and may be set according to actual needs.
  • the battery power value is the second power value
  • the input or output current of the battery is the battery current value
  • ⁇ t is a preset time interval.
  • the first electric quantity value and the second electric quantity value are both expressed as a percentage value, so the above I ⁇ t is actually a percentage value, that is, I ⁇ t and battery capacity. The ratio between the two. Therefore, it is necessary to pre-store a battery capacity value in the battery.
  • Step S30 re-determining the battery current value and the second power value according to the currently calculated first power value
  • the current calculated first power value is only a rough estimate of the current remaining battery value of the battery, in order to obtain a more accurate battery current remaining power value, a series of calculations are needed to finally obtain a more accurate current remaining power value, which is The second amount of electricity.
  • step S30 includes:
  • Step S31 determining a first open circuit voltage value and an internal resistance value corresponding to the currently calculated first power value according to a mapping relationship between a preset battery power value, an open circuit voltage value, and an internal resistance value;
  • a correspondence table between the temperature, the battery power value, the open circuit voltage value, and the internal resistance value may be established in advance.
  • two similar temperatures are selected in the correspondence table according to the current temperature.
  • the corresponding table is linearly interpolated, and a correspondence table between the battery power value, the open circuit voltage value, and the internal resistance value at the current temperature is prepared.
  • the closed circuit voltage CV of the battery is obtained, and the first electric quantity value is set to Q1.
  • the first open circuit voltage value OCV1 and the internal resistance value R1 of the battery are obtained according to the first electric quantity value Q1.
  • Step S32 obtaining a closed circuit voltage value of the battery, recalculating the battery current value according to the closed circuit voltage value, and the currently calculated first open circuit voltage value and the internal resistance value, and calculating a second open circuit voltage value;
  • FIG. 5 is a schematic diagram of the refinement process of an embodiment of step S32 in FIG. 4.
  • step S32 includes:
  • Step S321 recalculating the battery current value according to the closed circuit voltage value and the currently calculated first open circuit voltage value and the internal resistance value;
  • Step S322 determining a corresponding internal resistance value in the mapping relationship by using the closed circuit voltage value as an open circuit voltage value based on a preset mapping relationship between a battery power value, an open circuit voltage value, and an internal resistance value, to determine The current internal resistance value of the battery is calculated according to the closed circuit voltage value, and the currently calculated battery current value and internal resistance value.
  • the closed circuit voltage can be used as the open circuit voltage in the above correspondence table to obtain the corresponding internal resistance value of the battery, and the closed circuit power
  • the voltage difference between the voltage and the open circuit is small, and the difference of the internal resistance value corresponding to the relation table is also small. Therefore, it is more accurate to query the internal resistance value of the battery by the actually measured closed circuit voltage.
  • the re-determined battery internal resistance be R2
  • the second open circuit voltage OCV2 of the battery can be obtained as:
  • Step S33 determining a second power value corresponding to the second open circuit voltage value according to a mapping relationship between the preset battery power value, the open circuit voltage value, and the internal resistance value.
  • the second power value Q2 corresponding to the second open circuit voltage OCV2 is determined.
  • Step S40 determining a battery power indicator value according to the currently calculated second power value.
  • the power indicator value can be directly modified to the currently calculated second power value.
  • the second power value may be directly sent to the terminal for display by the terminal, or the modified power indicator value may be sent to the terminal for display by the terminal.
  • step S40 is performed.
  • step S40 includes:
  • step S41 it is determined that the battery is in a charging state or a discharging state; in this embodiment, whether the battery is in a charging state or a discharging state can be determined according to the battery current value, and when the battery current value is greater than zero, the battery is in a charging state; When the current value is less than zero, the battery is in a discharged state.
  • Step S42 when the battery is in the charging state, and when the recalculated second power value is greater than the current power indicator value of the battery, adding a first preset value to the current power indicator value;
  • Step S43 when the battery is in a discharged state, and when the recalculated second power value is less than the current power indicator value of the battery, the current power indicator value is decreased by a second preset value.
  • the steps S41, S42, and S43 can be performed once every other preset time.
  • the first preset value and the second preset value are both set to one. It should be noted that, in other embodiments, it may also be set to Other values.
  • the battery power detecting method of the present embodiment recalculates the first power value based on the preset time interval, the battery current value and the second power value at the previous time after the preset time interval, and obtains the current power value according to the current calculation.
  • the first power value re-determines the battery current value and the second power value, and finally determines the battery power indication value according to the currently calculated second power value, thereby improving the accuracy of the battery power detection, in the case where the battery capacity is unknown, Battery power detection is also possible, and the versatility is high.
  • FIG. 7 is a schematic flowchart of the second embodiment of the battery power detecting method according to the present invention.
  • the method further includes:
  • step S50 it is judged whether or not the termination instruction is received, and if not, the steps S20, S30 and S40 are continuously executed in sequence until the termination instruction is received.
  • steps S20, S30, S40, and S50 continue to be executed cyclically. That is to say, after every preset time interval, the first power value at the current time is calculated based on the preset time interval and the battery current value and the second power value determined at the previous time, and then according to the current time. The first electric quantity value determines the current battery current value and the second electric quantity value, and finally determines the battery electric quantity indication value according to the determined second electric quantity value of the current time, and when it is judged that the termination instruction is not received, continues to execute the above step.
  • the battery power detecting method further includes the following steps:
  • the battery charging value is calculated according to the preset time interval and the battery current value corresponding to the time interval, and is accumulated after each time.
  • the battery charge value is charged in the time interval until the battery is full, and the capacity value of the battery is updated according to the accumulated charge value of the battery.
  • the preset power amount is set to 10%. In other embodiments, the preset power value may also be 5% or 8%, etc., and may be set according to actual needs.
  • the battery will detect whether the current second power value is less than the preset power value. In this embodiment, if the current second power value is 6%, and thus the preset power value is less than 10%, the battery starts to accumulate. Calculate the value of the battery charge in each time interval after the time and before the battery is fully charged. Since the battery increases from 6% to 100% during this time period, that is, the battery power increases by 94%, so the battery capacity value The accumulated charge value of the battery is divided by 94%.
  • the updated battery capacity value can be used in the above step S20, that is, to calculate the current first power value.
  • the battery each time When charging is started, it is detected whether the current second power value is less than the preset power value, and the battery capacity value is updated when the current second power value is less than the preset power value.
  • the invention further provides a battery power detecting system.
  • FIG. 8 is a schematic diagram of functional modules of a first embodiment of a battery power detecting system according to the present invention.
  • the functional block diagram shown in FIG. 8 is merely an exemplary diagram of a preferred embodiment, and those skilled in the art will surround the functional modules of the battery power detecting system shown in FIG.
  • the new function modules can be easily supplemented; the names of the function modules are custom names, which are only used to assist in understanding the various program function blocks of the battery power detecting system, and are not used to limit the technical solutions of the present invention.
  • the core is the function that each functional module of the defined name has to achieve.
  • the battery charge detection system comprises:
  • the first calculating module 10 is configured to acquire a first power value of the battery, and determine a battery current value and a second power value according to the first power value;
  • the battery is generally pre-charged with a certain amount of power when leaving the factory, and the pre-stored power value may be pre-stored in the battery before leaving the factory, and the first power value may be a pre-stored power value.
  • the first power value may also be the current actual remaining power value of the battery, and the current battery remaining power value may be calculated according to the following embodiment.
  • FIG. 9 is a schematic diagram of a refinement function module of an embodiment of the first computing module of FIG.
  • the first computing module 10 includes:
  • the first calculating unit 11 is configured to acquire a first power value of the battery, and determine, according to a mapping relationship between the preset battery power value, the open circuit voltage value, and the internal resistance value, the first corresponding to the obtained first power value. Open circuit voltage value and internal resistance value.
  • a mapping relationship between the battery power value, the open circuit voltage value and the internal resistance value such as a function or a correspondence table, may be established in advance. Since the temperature also has a certain influence on the mapping relationship between the battery power value, the open circuit voltage value, and the internal resistance value, in this embodiment, first, a temperature, a battery power value, an open circuit voltage value, and an internal resistance value are established. Correspondence table. For example, a correspondence table between the battery power value, the open circuit voltage value, and the internal resistance value at -10 degrees, 0 degrees, 25 degrees, and 50 degrees can be created separately.
  • the battery power value may be the remaining power value of the battery, preferably, in this embodiment, The battery power value in the correspondence table is a ratio between the battery remaining power value and the battery capacity, and the first power value, the second power value, and the remaining power value are all expressed as percentage values.
  • a table corresponding to two similar temperatures is selected in the above correspondence table for linear interpolation, and a correspondence table between the battery power value, the open circuit voltage value and the internal resistance value at the current temperature is prepared.
  • the correspondence table corresponding to 0 degrees and 25 degrees is selected, and the two correspondence tables are linearly interpolated to obtain a correspondence table corresponding to 15 degrees.
  • the closed circuit voltage CV of the battery is obtained, and the first electric quantity value is set to Q1.
  • the first open circuit voltage value OCV1 and the internal resistance value R1 of the battery are obtained according to the first electric quantity value Q1.
  • the second calculating unit 12 is configured to acquire a closed circuit voltage value of the battery, calculate a battery current value according to the closed circuit voltage value, and the determined first open circuit voltage value and the internal resistance value, and calculate a second open circuit voltage value;
  • FIG. 10 is a schematic diagram of the refinement function module of the second computing unit in FIG. 9.
  • the second computing unit 12 includes:
  • the first calculating subunit 121 is configured to calculate a battery current value according to the closed circuit voltage value and the determined first open circuit voltage value and internal resistance value.
  • the second calculating sub-unit 122 is configured to determine, according to the mapping relationship between the preset battery power value, the open circuit voltage value, and the internal resistance value, the closed circuit voltage value as the open circuit voltage value in the mapping relationship
  • the resistance value is used to re-determine the current internal resistance value of the battery, and the second open circuit voltage value is calculated according to the closed circuit voltage value and the currently calculated battery current value and internal resistance value.
  • the closed circuit voltage can be used as the open circuit voltage to query the corresponding relationship table to obtain the corresponding internal resistance value, closed circuit voltage and open circuit voltage.
  • the difference is small, and the difference in the internal resistance value corresponding to the relation table is also small. Therefore, it is more accurate to query the internal resistance value of the battery with the actually measured closed circuit voltage.
  • the re-determined battery internal resistance be R2
  • the second open circuit voltage OCV2 of the battery can be obtained as:
  • the third calculating unit 13 is configured to determine a second power value corresponding to the second open circuit voltage value based on a mapping relationship between the preset battery power value, the open circuit voltage value, and the internal resistance value.
  • the second power value Q2 corresponding to the second open circuit voltage OCV2 is determined.
  • the second calculating module 20 is configured to, after a preset time interval, recalculate the first power value based on the preset time interval, and the determined battery current value and the second power value;
  • the preset time interval may be set according to actual needs. In order to ensure the accuracy of the power detection, the preset time interval should not be too large.
  • the preset time interval may be taken as 10 seconds. In other embodiments, the preset time interval may also be 5 seconds, 15 seconds, or 20, etc., and may be set according to actual needs.
  • the battery power value is the second power value
  • the input or output current of the battery is the battery current value
  • ⁇ t is a preset time interval.
  • the first electric quantity value and the second electric quantity value are both expressed as a percentage value, so the above I ⁇ t is actually a percentage value, that is, I ⁇ t and battery capacity. The ratio between the two. Therefore, it is necessary to pre-store a battery capacity value in the battery.
  • the first calculating module 10 is further configured to re-determine the battery current value and the second power value according to the currently calculated first power value;
  • the current calculated first power value is only a rough estimate of the current remaining battery value of the battery, in order to obtain a more accurate battery current remaining power value, a series of calculations are needed to finally obtain a more accurate current remaining power value, which is The second amount of electricity.
  • the first calculating unit 11 is further configured to determine the currently calculated first power according to a mapping relationship between the preset battery power value, the open circuit voltage value, and the internal resistance value.
  • the first open circuit voltage value and the internal resistance value corresponding to the value;
  • a correspondence table between the temperature, the battery power value, the open circuit voltage value, and the internal resistance value may be established in advance.
  • two similar temperatures are selected in the correspondence table according to the current temperature.
  • the corresponding table is linearly interpolated, and a correspondence table between the battery power value, the open circuit voltage value, and the internal resistance value at the current temperature is prepared.
  • the closed circuit voltage CV of the battery is obtained, and the first electric quantity value is set to Q1.
  • the first open circuit voltage value OCV1 and the internal resistance value R1 of the battery are obtained according to the first electric quantity value Q1.
  • the second calculating unit 12 is further configured to acquire a closed circuit voltage value of the battery, recalculate the battery current value according to the closed circuit voltage value, and the currently calculated first open circuit voltage value and the internal resistance value, and calculate a second open circuit. Voltage value;
  • the first calculating sub-unit 121 is further configured to recalculate the battery current value according to the closed circuit voltage value and the currently calculated first open circuit voltage value and internal resistance value. ;
  • the second calculating sub-unit 122 is further configured to determine a corresponding relationship in the mapping relationship by using the closed circuit voltage value as an open circuit voltage value based on a mapping relationship between a preset battery power value, an open circuit voltage value, and an internal resistance value.
  • the internal resistance value is used to re-determine the current internal resistance value of the battery, and the second open circuit voltage value is calculated according to the closed circuit voltage value and the currently calculated battery current value and internal resistance value.
  • the closed circuit voltage can be used as the open circuit voltage to query the corresponding relationship table to obtain the corresponding internal resistance value, closed circuit voltage and open circuit voltage.
  • the difference is small, and the difference in the internal resistance value corresponding to the relation table is also small. Therefore, it is more accurate to query the internal resistance value of the battery with the actually measured closed circuit voltage.
  • the re-determined battery internal resistance be R2
  • the second open circuit voltage OCV2 of the battery can be obtained as:
  • the third calculating unit 13 is further configured to determine a second power value corresponding to the second open circuit voltage value according to a mapping relationship between a preset battery power value, an open circuit voltage value, and an internal resistance value.
  • the second power value Q2 corresponding to the second open circuit voltage OCV2 is determined.
  • the determining module 30 is configured to determine a battery power indicator value according to the currently calculated second power value
  • the power indicator value can be directly modified to the currently calculated second power value.
  • the second power value may be directly sent to the terminal for display by the terminal, or the modified power indicator value may be sent to the terminal for display by the terminal.
  • FIG. 11 is a schematic diagram of the refinement function module of the determining module in FIG. 8 .
  • the determining module 30 includes:
  • the determining unit 31 is configured to determine that the battery is in a charging state or a discharging state; in this embodiment, whether the battery is in a charging state or a discharging state may be determined according to the battery current value, and when the battery current value is greater than zero, the battery is in a charging state. When the battery current value is less than zero, the battery is in a discharged state.
  • the first adjusting unit 32 is configured to increase the first preset value of the current power indicator value when the battery is in a charging state, and when the recalculated second power value is greater than a current power indicator value of the battery;
  • the second adjusting unit 33 is configured to reduce the current power indicator value by a second preset value when the battery is in a discharged state, and when the recalculated second power value is less than a current power indicator value of the battery
  • the electric quantity indication value is to be changed according to the current second electric quantity value every other minute, that is, the electric quantity indication value is updated every one minute.
  • the first preset value and the second preset value are both set to one. It should be noted that, in other embodiments, it may also be set to Other values.
  • the battery power detecting system of the present embodiment recalculates the first power value based on the preset time interval, the battery current value and the second power value at the previous time after the preset time interval, and obtains the current power value according to the current calculation.
  • the first power value re-determines the battery current value and the second power value, and finally determines the battery power indication value according to the currently calculated second power value, thereby improving the accuracy of the battery power detection, in the case where the battery capacity is unknown, Battery power detection is also possible, and the versatility is high.
  • FIG. 12 is a schematic diagram of a functional module of a battery power detecting system according to a second embodiment of the present invention.
  • the battery power detecting system further includes a loop control module. 40. Set to determine whether a termination instruction is received, and if not, control the first calculation module, the second calculation module, and the determination module to work until a termination instruction is received.
  • the battery when the battery is exhausted, it can be regarded as receiving the termination command, or the terminal sends a termination signal to the battery, which can also be regarded as a termination instruction.
  • the first calculation module, the second calculation module, and the determination module are controlled to operate. That is to say, after every preset time interval, the first power value at the current time is calculated based on the preset time interval and the battery current value and the second power value determined at the previous time, and then according to the current time.
  • the first electric quantity value determines the current battery current value and the second electric quantity value, and finally determines the battery electric quantity indication value according to the determined second electric quantity value of the current time, and when it is judged that the termination instruction is not received, continues to execute the above step.
  • FIG. 13 is a schematic diagram of a functional module of a battery power detecting system according to a third embodiment of the present invention.
  • the battery power detecting system further includes a capacity updating module 50, and the capacity update is performed.
  • the module 50 is configured to calculate, when the battery is in a charging state, and the current second power value is less than the preset power value, calculate a power value of the battery charged in the time interval according to the preset time interval and the battery current value corresponding to the time interval. And accumulating the charge value of the battery after each time interval until the battery is full, and updating the capacity value of the battery according to the accumulated charge value of the battery.
  • the preset power amount is set to 10%. In other embodiments, the preset power value may also be 5% or 8%, etc., and may be set according to actual needs.
  • the battery will detect whether the current second power value is less than the preset power value. In this embodiment, if the current second power value is 6%, and thus the preset power value is less than 10%, the battery starts to accumulate. Calculate the value of the battery charge in each time interval after the time and before the battery is fully charged. Since the battery increases from 6% to 100% during this time period, that is, the battery power increases by 94%, so the battery capacity value The accumulated charge value of the battery is divided by 94%.
  • the updated battery capacity value can be used in the above step S20, that is, to calculate the current first power value.
  • each time the battery starts charging it detects whether the current second power value is less than the preset power value, and updates the battery capacity value when the current second power value is less than the preset power value.
  • the battery power detecting system in the above embodiment may be integrated in the battery, or may be set as a separate module in the terminal, and may be set according to actual needs.
  • the present invention further provides a battery, which includes a power detecting system.
  • the structure of the power detecting system can be referred to the above embodiment, and details are not described herein again.
  • the battery of the embodiment adopts the technical solution of the above-described electric quantity detecting system, the battery has all the advantageous effects of the above-described electric quantity detecting system.
  • the accuracy of the battery power detection is improved, and in the case where the battery capacity is unknown, the battery power detection can be performed, and the versatility is high.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne un procédé pour détecter le niveau de charge d'une batterie, comprenant : après un intervalle de temps prédéfini, le nouveau calcul d'une première valeur de niveau de charge en se basant sur l'intervalle de temps prédéfini et d'une valeur actuelle et d'une seconde valeur de niveau de charge de la batterie à l'instant précédent, la nouvelle détermination de la valeur actuelle et de la seconde valeur de niveau de charge de la batterie en fonction de la première valeur de niveau de charge actuellement obtenue par calcul, et enfin la détermination d'une valeur d'indication de niveau de charge de la batterie en fonction de la seconde valeur de niveau de charge calculée actuelle, ce qui permet d'augmenter la précision de détection du niveau de charge de la batterie, de sorte que le niveau de charge de la batterie peut également être détecté dans le cas où la capacité de la batterie est inconnue, et la généralité est relativement élevée. L'invention concerne également un système de détection de niveau de charge d'une batterie et une batterie.
PCT/CN2014/086661 2014-08-08 2014-09-16 Procédé et système de détection de niveau de charge de batterie et batterie WO2015154381A1 (fr)

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