WO2020043128A1 - Procédé et dispositif permettant de déterminer l'état de charge d'une batterie, et puce, batterie et aéronef associés - Google Patents

Procédé et dispositif permettant de déterminer l'état de charge d'une batterie, et puce, batterie et aéronef associés Download PDF

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Publication number
WO2020043128A1
WO2020043128A1 PCT/CN2019/103052 CN2019103052W WO2020043128A1 WO 2020043128 A1 WO2020043128 A1 WO 2020043128A1 CN 2019103052 W CN2019103052 W CN 2019103052W WO 2020043128 A1 WO2020043128 A1 WO 2020043128A1
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battery
current
preset
threshold
state
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PCT/CN2019/103052
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English (en)
Chinese (zh)
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秦威
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深圳市道通智能航空技术有限公司
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Publication of WO2020043128A1 publication Critical patent/WO2020043128A1/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]

Definitions

  • Embodiments of the present invention relate to the technical field of batteries, and in particular, to a method for determining a charging state of a battery, a device for determining a charging state of a battery, a chip, a battery having the chip, and an aircraft having the battery.
  • the battery is an essential part of the operation of various devices, such as aircraft, terminal devices, wearable devices, and so on.
  • the battery can provide power for various systems or modules of the aircraft, such as power for the flight controller, radio transceiver module, motor, and ESC of the aircraft to ensure normal flight.
  • the battery usually needs to judge its current state (such as the charging state or the discharging state), so as to perform corresponding operations according to the current state of the battery, for example, when it is determined that the battery is in a charging state At this time, the battery is controlled to be charged to ensure that the battery is in a charging state.
  • the battery is controlled to be discharged to ensure that the battery is in a discharged state, thereby ensuring the normal use of the battery and thus the normal flight of the aircraft.
  • the judgment of the state of charge of the battery usually depends mainly on the direction of the current. Specifically, when a current in a charging direction (ie, a charging current) exists, it is determined that the battery is in a charging state; when a current in a discharging direction (ie, a discharge current) exists, it is determined that the battery is in a discharging state.
  • a charging direction ie, a charging current
  • a discharging direction ie, a discharge current
  • the main purpose of the present invention is to provide a method, a device, a chip, a battery and an aircraft for determining the state of charge of a battery, which can improve the accuracy of determining the state of charge of the battery, reduce misjudgments, and thereby ensure the stability and reliability of the battery function , Thereby ensuring the flight safety of the aircraft using the battery.
  • an embodiment of the present invention provides a method for determining a charging state of a battery, where the method includes:
  • a charging state of the battery is determined according to a comparison result obtained by comparing an output voltage of the battery with a preset voltage threshold.
  • determining the state of charge of the battery according to a time duration during which the current of the battery is in a preset current range includes:
  • the second preset current threshold is greater than the first preset current threshold, and the first preset time is greater than the second preset time.
  • the determining a charging state of the battery according to a comparison result obtained by comparing a voltage at an output terminal of the battery with a preset voltage threshold includes:
  • the method further includes:
  • the wake-up trigger signal When it is detected that the wake-up trigger signal is received, if it is detected that the current of the battery is greater than or equal to the third preset current threshold for a time longer than the third preset time, it is determined that the battery is in a charging state.
  • an embodiment of the present invention further provides a device for determining a charging state of a battery, where the device includes:
  • a power acquisition module configured to acquire the current power of the battery when it is detected that the battery is in an operating state
  • a first determining module configured to determine whether the current power is less than a first preset power threshold
  • a first determining module configured to determine a charging state of the battery according to a time duration when the current of the battery is in a preset current range when the current power is less than the first preset power threshold;
  • a second determining module configured to determine the battery according to a comparison result obtained by comparing an output voltage of the battery with a preset voltage threshold when the current power is greater than or equal to the first preset power threshold State of charge.
  • the first determining module is specifically configured to:
  • the second preset current threshold is greater than the first preset current threshold, and the first preset time is greater than the second preset time.
  • the second determining module is specifically configured to:
  • the apparatus further includes:
  • a second determination module configured to determine whether a wake-up trigger signal is received when the battery is detected to be in a standby state or a sleep state, and the wake-up trigger signal is used to wake up the battery;
  • a third determining module configured to determine the battery when it is detected that the duration of the current of the battery is greater than or equal to a third preset current threshold after the reception of the wake-up trigger signal is greater than a third preset time Being charged.
  • an embodiment of the present invention further provides a chip, including:
  • At least one processor At least one processor
  • a memory connected in communication with the at least one processor; wherein,
  • the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method for determining a charging state of a battery as described above. .
  • an embodiment of the present invention further provides a computer program product.
  • the computer program product includes a computer program stored on a non-volatile computer-readable storage medium.
  • the computer program includes program instructions. When the program instructions are executed by a computer, the computer is caused to execute the method for determining a state of charge of a battery as described above.
  • an embodiment of the present invention further provides a non-volatile computer-readable storage medium, where the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause a computer to execute A method of determining the state of charge of a battery as described above.
  • an embodiment of the present invention further provides a battery, including a chip as described above.
  • an embodiment of the present invention further provides an aircraft, which includes the battery as described above, and the battery is used to provide power.
  • the state of the battery is directly determined only by the direction of the current, misjudgment is easy to occur.
  • the current power of the battery is less than the first preset power threshold
  • the current according to the battery is at the preset current.
  • the duration of the range determines the state of charge of the battery.
  • the battery's charge is determined according to the comparison result obtained by comparing the output voltage of the battery with the preset voltage threshold. The state can improve the accuracy of judging the charging state of the battery and reduce misjudgment, thereby ensuring the stability and reliability of the battery function, and further ensuring the flight safety of the aircraft using the battery.
  • FIG. 1 is a schematic flowchart of a method for determining a charging state of a battery according to an embodiment of the present invention
  • FIG. 2 is a circuit diagram of a battery provided by an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a wake-up circuit according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of switching between a battery in a standby state or a hibernation state and a battery in an operating state according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a current waveform obtained by performing a limit test on a current of a single motor of an aircraft according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of a voltage detection circuit according to an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of another method for determining a charging state of a battery according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a device for determining a charging state of a battery according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a hardware structure of a chip according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of a battery provided by an embodiment of the present invention.
  • FIG. 11 is a schematic diagram of an aircraft provided by an embodiment of the present invention.
  • FIG. 1 is a schematic flowchart of a method for determining a charging state of a battery according to an embodiment of the present invention.
  • the method for determining the charging status of a battery may be applicable to determining the charging status of various batteries, such as a lithium battery, a nickel-cadmium battery, or other storage batteries.
  • the battery can be applied to various electronic devices, for example, aircrafts, electric vehicles, terminal devices, wearable devices, and the like.
  • the method for determining the state of charge of a battery may be performed by any suitable type of chip with a certain logic operation and processing capability, such as a battery main control chip (such as an MCU). The following takes a battery main control chip as an example for detailed description.
  • the method for determining a charging state of a battery includes:
  • the battery may include, but is not limited to, the following states: a standby state (equivalent to a low power consumption state), a hibernation state, and an operating state.
  • the working state includes: a discharging state and a charging state. When there is no current flowing in the main circuit of the battery, it means that the battery is in standby or hibernation state; when there is current flowing in the main circuit of the battery, it means that the battery is in working state.
  • the switch circuit in the battery main circuit When the battery is in the standby or hibernation state, the switch circuit in the battery main circuit will be in the off state. At this time, no current flows through the battery main circuit.
  • the battery may be a battery pack composed of one or more battery cells to meet the power supply requirements of different electronic devices.
  • the battery includes a total positive terminal B +, a total negative terminal B-, an output positive PACK +, and an output negative PACK-.
  • the total positive terminal B + of the battery is the highest voltage terminal of the battery, and the total negative terminal B- of the battery is the lowest voltage terminal of the battery.
  • the total negative terminal B- of the battery is grounded.
  • the positive output terminal PACK + of the battery is the positive output terminal of the battery, and the negative output terminal PACK- of the battery is the negative output terminal of the battery.
  • the battery output positive PACK + is also the battery's positive charging port
  • the battery output negative PACK- is also the battery's negative charging port.
  • the charging MOS tube Q1 and Q2 in FIG. 2 are the charging MOS tube and the discharging MOS tube of the battery main circuit, respectively.
  • the charging MOS tube Q1 and the discharging MOS tube Q2 may be disposed between the total positive terminal of the battery and the output positive electrode of the battery. In some other embodiments, the charging MOS tube Q1 and the discharging MOS tube Q2 may also be disposed between the total negative terminal of the battery and the output negative electrode of the battery.
  • RSENSE in Figure 2 is the main circuit current detection resistor.
  • Q1 and Q2 are in the off state, and no current flows through the detection resistor RSENSE, that is, no current flows through the battery main circuit.
  • the main control chip of the battery can be awakened by receiving a wake-up trigger signal.
  • the battery's output positive PACK + is the positive voltage of the charger divided by R1 and R2, so that the MOS tube Q3 is on.
  • the main control chip of the battery receives the wake-up trigger signal, thereby triggering the interruption of the main control chip of the battery, so that the main control chip of the battery is awakened, and the main control chip of the battery controls the charging in the main circuit of the battery in FIG. 2
  • the MOS tube Q1 and the discharging MOS tube Q2 are turned on. At this time, a current flows through the detection resistor RSENSE, that is, a current flows through the main circuit of the battery, so as to judge the subsequent battery charging status.
  • the battery's main control chip can make the battery's main control chip in a working state by receiving a user operation instruction, and then the battery is in a working state.
  • the user touches or presses the on / off key of the battery, so that the main control chip of the battery receives a user operation instruction, so that the battery puts the battery into a working state.
  • the battery can also be put into a standby state or a hibernation state by receiving a user operation instruction.
  • the battery standby state or the switching between the hibernation state and the working state may be performed in other suitable manners, for example, receiving a switching trigger instruction sent by an external device such as a terminal device.
  • a current flows through the battery's main circuit.
  • the battery's main circuit that is, the current in the discharge direction; if the external (such as a charger, etc.) charges the battery, the battery's main circuit exists.
  • the charging current that is, the current in the charging direction.
  • FIG. 5 it is a schematic diagram of a current waveform obtained by performing a limit test on the current of a single motor of an aircraft. It can be seen from FIG. 5 that during the rapid switching of full throttle forward and full throttle reverse, a single motor will have a large reverse charging current. As shown in FIG. 5,
  • the reverse charging current is -4.1A, and the duration is about 0.171s.
  • the negative sign of the reverse charging current in -4.1A indicates that the reverse charging current and the discharging current have opposite directions.
  • the duration of the reverse charge current is very short, it can be seen from the figure that if the motor is decelerating and reverse pushing, there will be a reverse charge current. In this case, if the overall current becomes The charging direction is the charging current. If the battery has just sampled such a current, according to the normal judgment logic of the battery control chip, the battery will be judged to be in the charging state, and then the battery will be controlled to enter the charging state. Disappear, the battery will enter the shutdown state, which will lead to aircraft bombers and so on.
  • the embodiment of the present invention determines the charging state of the battery based on the battery characteristics when the battery is charged, so that Improve the accuracy of judging the state of charge of the battery. Specifically, when it is detected that the battery is in an operating state, the charging state of the battery is determined according to the charging characteristics corresponding to the battery in different charging stages. Because the battery is in a different charging stage, the corresponding battery has a different power level, so the current charging level of the battery can be used to determine the current charging stage of the battery.
  • the main control chip of the battery first obtains the current power of the battery.
  • the current power can be expressed as a percentage of the remaining power of the battery, that is, the ratio of the current remaining capacity of the battery to the available capacity indicates the current power, for example, the current power is 80%, 81%, ..., 90%, and so on.
  • the remaining capacity of the battery refers to the capacity that the battery can discharge from the current until the discharge voltage is the discharge termination voltage.
  • Available capacity refers to the maximum capacity of the battery.
  • the current power of the battery can be obtained through a power measurement device such as a fuel gauge.
  • a power measurement device such as a fuel gauge.
  • the main control chip of the battery is connected to the fuel gauge, and the current power of the battery is obtained by receiving the fuel gauge.
  • the main control chip of the battery may also obtain the current power of the battery through other methods, for example, an open circuit voltage method, a coulomb monitoring method, or determining the current power of the battery based on the internal resistance of the battery.
  • the main idea of determining the current capacity of the battery based on the internal resistance of the battery is: according to the discharge depth corresponding to the current temperature, the mapping relationship between the open circuit voltage and the internal resistance of the battery (including the first correspondence between the discharge depth and the open circuit voltage and The second correspondence between the depth of discharge and the internal resistance of the battery), combined with the current at the current point in time, to determine the depth of discharge when the discharge voltage of the battery is the discharge termination voltage, and then to determine the remaining capacity of the battery based on the depth of discharge, Then determine the battery's current capacity based on the remaining capacity and available capacity of the battery.
  • the method for determining the remaining capacity of the battery based on the internal resistance of the battery includes: establishing a mapping relationship between a battery's discharge depth, an open circuit voltage, and the internal resistance of the battery in each preset temperature interval in advance; obtaining the current at the current point in time; obtaining A mapping relationship corresponding to the current temperature, and according to the obtained mapping relationship and the current at the current point in time, determining a discharge depth of the battery when the discharge voltage is a discharge end voltage; obtaining a maximum chemical capacity of the battery And obtaining the current discharge depth of the battery; determining the remaining capacity of the battery according to the current discharge depth, the maximum chemical capacity, and the discharge depth corresponding to the discharge termination voltage of the battery; The remaining capacity and available capacity of the battery determine the current capacity of the battery.
  • the first preset power threshold value may be pre-configured in a main control chip of the battery. Or, adjust it according to needs, for example, adjust the first preset power threshold value according to different battery types (such as lithium batteries, nickel-cadmium batteries), application scenarios, etc., or set the first preset power threshold value by the user in order to apply to Various types of batteries or application scenarios.
  • different battery types such as lithium batteries, nickel-cadmium batteries), application scenarios, etc.
  • set the first preset power threshold value by the user in order to apply to Various types of batteries or application scenarios.
  • the first preset power threshold is used to define the battery's stage. For battery charging, in order to protect the battery and prevent the charger from repeatedly charging the battery or overcharging the battery, causing damage to the battery. When it reaches or exceeds a certain value, even if the battery's output positive PACK + and output negative PACK- are directly connected to a charging device such as a charger, it will control to stop charging the battery. At this time, no current can be detected. When the battery power does not reach this value, the battery's output positive PACK + and output negative PACK- are directly connected to a charging device such as a charger and will continue to charge the battery. Therefore, it is defined by the first preset power threshold whether the battery has reached a stage where the charger is connected but the control stops charging the battery.
  • the first preset power threshold may be determined according to historical test data. For example, counting the number of times a battery is connected to a charging device such as a charger but controlling the battery power when the battery is stopped charging, and averaging the battery power in this case to obtain the first preset power threshold.
  • the first preset power threshold may also be determined according to characteristics of the battery itself.
  • the first preset power threshold value may be a specific value or any value within a range. For example, the first preset power threshold value may be 95%, or may be any value within the range of 95% -100%. value.
  • the misjudgment caused by the interference of anti-charge current taking into account that the existence of general anti-charge current is short, and Because when it is greater than or equal to the first preset power threshold, no current can be detected. Therefore, when the current power is less than the first preset power threshold, the main control chip of the battery determines the state of charge of the battery according to the duration of the battery current in the preset current range, so as to improve the determination of the state of charge of the battery Accuracy.
  • the charging MOS tube and the discharging MOS tube of the battery main circuit are in an open state, and there is a current in the battery main circuit, which is the charging current, that is, the current in the charging direction.
  • the constant current phase and the current sampled during this phase is relatively large; the battery is continuously charged.
  • Voltage phase the current sampled during this phase is relatively small.
  • the main control chip of the battery determines the state of charge of the battery according to the duration of the battery current in the preset current range, including: When the current power is greater than a second preset power threshold and less than the first preset power threshold, if it is detected that the current of the battery is greater than the first preset current threshold for a time greater than the first preset time, it is determined The battery is in a charging state; when the current power is less than or equal to the second preset power threshold, if it is detected that the current of the battery is greater than the second preset current threshold, the time duration is greater than the second preset time When it is determined that the battery is in a charging state.
  • the second preset power threshold, the first preset current threshold, and the second preset current threshold may be pre-configured in a main control chip of the battery. Or, make adjustments as needed, for example, adjust the second preset power threshold, the first preset current threshold, the second preset current threshold according to different battery types (such as lithium batteries, nickel-cadmium batteries), application scenarios, or The user customizes the second preset power threshold, the first preset current threshold, and the second preset current threshold to be suitable for various types of batteries or application scenarios.
  • the second preset power threshold is also used to define the stage in which the battery is located. Specifically, when the current power is less than or equal to the second preset power threshold, the charger performs constant current charging of the battery; when the current power is greater than the second preset power threshold and is less than the first preset power When the charge threshold is reached, the charger charges the battery at a constant voltage.
  • the second preset power threshold is smaller than the first preset power threshold. For example, the second preset power threshold may be 90%.
  • the manner of determining the second preset power threshold value is similar to the manner of determining the second preset power threshold value, and therefore, details are not described herein.
  • Both the first preset current threshold and the second preset current threshold can be determined by the constant current charging current of the charger.
  • the constant current charging current of the charger is Imax (that is, the maximum charging current)
  • the second preset charge threshold such as 90%
  • the battery's main The charging MOS tube Q1 and the discharging MOS tube Q2 in the loop are turned on, and the current of the charger can be directly charged into the battery.
  • the battery ’s current capacity is less than or equal to 90%
  • the battery current can reach the maximum charging current Imax.
  • 0.9 times Imax is used as the judgment, that is, the second preset current threshold is equal to 0.9 * Imax, and the judgment is slightly reduced. Conditions for better compatibility.
  • the battery's main control chip detects that the battery current is greater than or equal to 0.9 * Imax and the duration is greater than the second preset time, it is considered that the charger is charging, that is, the battery is in a charging state, and controls the battery to enter a charging state .
  • the second preset time can be pre-configured in the main control chip of the battery, or adjusted as needed.
  • the second preset time is 5S.
  • the continuous 5S is also to ensure that the interference of reverse current can be filtered. Because the reverse current is generally an instantaneous spike, it generally does not exist continuously for 5S, and the charger can always exist in order to improve the determination of the battery's charging status. accuracy.
  • the battery's current power is greater than the second preset power threshold and less than the first preset power threshold, such as greater than 90% and less than 95%, similarly, the battery is in the working state, and the battery's main circuit is The charging MOS tube Q1 and the discharging MOS tube Q2 are turned on, and the current of the charger can be directly charged into the battery.
  • the first preset current threshold value for judging the charging state at this stage must also be appropriately reduced, that is, the second preset current threshold value is greater than the first preset current threshold value.
  • the first preset time for determining the charging state may be increased relative to the second preset time, that is, the first preset time is greater than the second preset time.
  • the first preset time may be 8S, and the interference of reverse current is further avoided here. Since the first preset current threshold used to determine the charging state is reduced, the risk of misjudgment of reverse current is increased, so This risk is offset by increasing the first preset time.
  • the first preset power threshold is 95%
  • the second preset power threshold is 90%
  • the first preset current threshold is 0.4 * Imax
  • the second preset current threshold is 0.9. * Imax
  • the first preset time is 8S
  • the second preset time is 5s.
  • the battery's main control chip will control the charging MOS tube Q1 to be turned off.
  • the gate voltage of the charging MOS tube Q1 is pulled down to be equal to the total positive terminal B + voltage of the battery, so that the charging MOS tube Q1 is in the off state.
  • the voltage of the battery's total positive terminal B + can only be conducted to the battery's output positive PACK + through the body diode of Q1. Because the body diode of Q1 has a certain voltage drop, for example, a voltage drop of about 0.5V, the battery's The voltage of the output positive PACK + will be lower than the voltage of the battery's total positive terminal B + by about 0.5V. In addition, since the charging MOS tube Q1 is in an off state, the charger cannot charge the battery. Therefore, the main control chip of the battery cannot determine whether the battery is in a charging state by the current of the battery.
  • the main control chip of the battery determines whether the battery is in a charging state by detecting the voltage and comparing the output voltage of the battery with a preset voltage threshold.
  • the main control chip of the battery determines the state of charge of the battery according to a comparison result obtained by comparing the output voltage of the battery with a preset voltage threshold, including: if the output voltage is relative to the preset When there is a change in the voltage threshold and the change is within a preset range, it is determined that the battery is in a charging state.
  • the preset voltage threshold is determined by the output positive PACK + of the battery corresponding to the current capacity of the battery being greater than or equal to the first preset power threshold. For example, at this time, the output positive PACK + of the battery is 4.5V. The voltage drop between the total positive terminal B + of the battery in the preset range and the battery output positive PACK + is determined. For example, the preset range may be 0-0.5V.
  • the state of charge of the battery is determined based on a voltage detection circuit as shown in FIG. 6.
  • the detection voltage circuit includes voltage dividing resistors R3 and R4 and a capacitor C1.
  • the voltage of the battery output positive PACK + is divided by the voltage dividing resistors R3 and R4 and then input to the ADC detection port of the battery main control chip through the filter capacitor C1.
  • the battery main control chip detects whether the voltage change detected by the ADC port Plug in the charger, that is, check if the battery is charging.
  • the charging MOS tube Q1 As the current charge of the battery is above 95%, the charging MOS tube Q1 is in the off state, and the output positive electrode PACK + of the battery has a voltage lower than the total positive electrode B + 0.5V of the battery, and because the voltage of the charger is the highest voltage of the battery, So even if the battery has reached the maximum voltage, if a charger is inserted into the battery, the voltage of the battery's output positive PACK + will still change slightly.
  • the battery's main control chip can detect whether a charger is inserted through this slight change in voltage. , That is, whether the battery is in a charging state, and when in a charging state, control the battery to maintain a charging state.
  • the battery main control chip determines that the battery is in a charging state , And then control the battery into a charging state.
  • Step 103 is performed at the same time as step 104.
  • the charging state of the battery is determined according to the duration of the battery current in the preset current range.
  • the current power is greater than or equal to the first preset power threshold
  • determining the state of charge of the battery according to the comparison result obtained by comparing the output voltage of the battery with the preset voltage threshold can improve the accuracy of determining the state of charge of the battery and reduce Misjudgment, thereby ensuring the stability and reliability of the battery function, and thus ensuring the flight safety of the aircraft using the battery.
  • FIG. 7 is a schematic flowchart of another method for determining a charging state of a battery according to an embodiment of the present invention.
  • the method for determining the charging status of a battery may be applicable to determining the charging status of various batteries, such as a lithium battery, a nickel-cadmium battery, or other storage batteries.
  • the battery can be applied to various electronic devices, for example, aircrafts, electric vehicles, terminal devices, wearable devices, and the like.
  • the method for determining the state of charge of a battery may be performed by any suitable type of chip with a certain logic operation and processing capability, such as a battery main control chip (such as an MCU). The following takes a battery main control chip as an example for detailed description.
  • the method for determining a charging state of a battery includes:
  • steps 701-704 in this embodiment of the present invention are similar to steps 101-104 in the above embodiment.
  • steps 701-704 in this embodiment of the present invention reference may be made to the above implementation. The detailed description of steps 101-104 in the example will not be repeated here.
  • the switch circuit in the battery main circuit is in an off state. At this time, no current flows in the battery main circuit. At this time, if the main control chip of the battery receives the wake-up trigger signal, the main control chip of the battery can be awakened so that the battery is awakened. At this time, a current will flow through the main circuit of the battery to determine the battery's power based on the current. charging. Among them, based on the wake-up circuit in FIG. 3, after the charger is connected, the main control chip of the battery can receive the wake-up trigger signal, thereby waking up the battery.
  • the charging state of the battery may be determined based on a period of current to improve the accuracy of determining the charging state of the battery. For the judgment of the discharge state, this current is the discharge current.
  • the third preset current threshold and the third preset time may be pre-configured in the main control chip of the battery. Or, make adjustments as needed, for example, adjust the third preset current threshold, third preset time, or user-defined third preset according to different battery types (such as lithium batteries, nickel-cadmium batteries), application scenarios, etc.
  • a current threshold, and a third preset time so as to be applicable to various types of batteries or application scenarios.
  • the third preset current threshold is used to define whether a discharge current exists. Therefore, the third preset current threshold can be determined by the minimum identification current of the battery. For example, assuming that the minimum identification current of the battery is Imin, the third preset current threshold may be Imin.
  • the third preset time is used to ensure that interference from reverse current can be filtered out, and the third preset time may be 2S.
  • Step 705 is performed at the same time as step 701.
  • the charging state of the battery when the battery is in the working state, when the current power of the battery is less than the first preset power threshold, the charging state of the battery is determined according to the duration of the battery current in the preset current range.
  • the charging state of the battery is determined according to a comparison result obtained by comparing the output voltage of the battery with the preset voltage threshold; and, when the battery is in the standby state or hibernation state, The state of charge of the battery is determined according to the time that the wake-up trigger signal is received and the current of the battery is greater than or equal to the third preset current threshold and is longer than the third preset time.
  • FIG. 8 is a schematic diagram of a device for determining a charging state of a battery according to an embodiment of the present invention.
  • the device 80 for determining the charging state of a battery may be suitable for determining the charging state of various batteries, such as a lithium battery, a nickel-cadmium battery, or other storage batteries.
  • the device 80 for determining the state of charge of the battery may be configured in any suitable type of chip with a certain logic operation capability, such as a main control chip of the battery.
  • the apparatus 80 for determining a charging state of a battery includes a power acquisition module 801, a first determination module 802, a first determination module 803, a second determination module 804, a second determination module 805, and a third determination module 806. .
  • the power acquisition module 801 is configured to acquire the current power of the battery when it is detected that the battery is in an operating state.
  • the battery may include, but is not limited to, the following states: a standby state (equivalent to a low power consumption state), a hibernation state, and an operating state.
  • the working state includes: a discharging state and a charging state. When there is no current flowing in the main circuit of the battery, it means that the battery is in standby or hibernation state; when there is current flowing in the main circuit of the battery, it means that the battery is in working state.
  • the battery when the battery is in a standby state or a hibernation state, taking charging as an example, the battery can be awakened by receiving a wake-up trigger signal. When the battery is awakened, a current flows through the battery's main circuit.
  • the battery when the battery is awakened, the battery can be put into a working state by receiving a user operation instruction, and when the battery is in a working state, the battery can also be put into a standby state or a sleep state by receiving a user operation instruction.
  • the battery When the battery is in operation, current is also flowing through the battery's main circuit.
  • the embodiment of the present invention determines the charging state of the battery based on the battery characteristics during the charging of the battery, so as to improve the judgment Accuracy of the state of charge of the battery. Specifically, when it is detected that the battery is in an operating state, the charging state of the battery is determined according to the charging characteristics corresponding to the battery in different charging stages. Because the battery is in a different charging stage, the corresponding battery has a different power level, so the current charging level of the battery can be used to determine the current charging stage of the battery.
  • the power acquisition module 801 acquires the current power of the battery.
  • the current power can be expressed as a percentage of the remaining power of the battery, that is, the ratio of the current remaining capacity of the battery to the available capacity indicates the current power, for example, the current power is 80%, 81%, ..., 90%, and so on.
  • the remaining capacity of the battery refers to the capacity that the battery can discharge from the current until the discharge voltage is the discharge termination voltage.
  • Available capacity refers to the maximum capacity of the battery.
  • the current power of the battery can be obtained through a power measurement device such as a fuel gauge.
  • a power measurement device such as a fuel gauge.
  • the power acquisition module 801 is connected to the fuel gauge to receive the current power of the batteries measured by the fuel gauge.
  • the power acquisition module 801 may also obtain the current power of the battery by other methods, for example, an open circuit voltage method, a coulomb monitoring method, or determining the current power of the battery based on the internal resistance of the battery.
  • the first determining module 802 is configured to determine whether the current power amount is less than a first preset power amount threshold.
  • the first determining module 803 is configured to determine a charging state of the battery according to a duration in which the current of the battery is in a preset current range when the current power is less than the first preset power threshold.
  • the misjudgment caused by the interference of anti-charge current taking into account that the existence of general anti-charge current is short, and Because when it is greater than or equal to the first preset power threshold, no current can be detected. Therefore, when the current power is less than the first preset power threshold, the first determining module 803 determines the charging state of the battery according to the duration of the battery current in the preset current range, so as to improve the determination of the battery charging state. Accuracy.
  • the constant current phase and the current sampled during this phase is relatively large; the battery is continuously charged.
  • Voltage phase the current sampled during this phase is relatively small.
  • the first determining module 803 is specifically configured to: when it is detected that the current of the battery is greater than the first preset current threshold when the current power is greater than the second preset power threshold and less than the first preset power threshold When the elapsed time is greater than the first preset time, it is determined that the battery is in a charging state; when the current power is less than or equal to the second preset power threshold, if it is detected that the battery current is greater than the second preset power When the duration of the current threshold is greater than the second preset time, it is determined that the battery is in a charging state.
  • the second preset current threshold is greater than the first preset current threshold, and the first preset time is greater than the second preset time.
  • the second determining module 804 is configured to determine, when the current power is greater than or equal to the first preset power threshold, a comparison result obtained by comparing the output voltage of the battery with a preset voltage threshold. The state of charge of the battery.
  • the charging MOS tube Q1 When the current battery power is greater than or equal to the first preset power threshold, such as greater than or equal to 95%, since the current battery power is above 95%, the charging MOS tube Q1 is in an off state, so the charger cannot Charging the battery, therefore, it is not possible to determine whether the battery is in a charging state by the current of the battery.
  • the first preset power threshold such as greater than or equal to 95%
  • the second determining module 804 is specifically configured to determine that the battery is in a charging state if the output terminal voltage changes with respect to the preset voltage threshold and the change is within a preset range.
  • the second determination module 805 is configured to determine whether a wake-up trigger signal is received when the battery is detected to be in a standby state or a sleep state, and the wake-up trigger signal is used to wake up the battery.
  • the switch circuit in the battery main circuit When the battery is in the standby or hibernation state, the switch circuit in the battery main circuit will be in the off state. At this time, no current flows in the battery main circuit. At this time, a wake-up trigger signal needs to be received to wake up the battery, so that a current flows through the main circuit of the battery, so as to subsequently determine the charging state of the battery based on the current. Therefore, the second determination module 805 is required to determine whether a wake-up trigger signal is received, so as to determine the charging state of the battery.
  • the third determining module 806 is configured to determine, when detecting that the wake-up trigger signal is received, if the detected current of the battery is greater than or equal to a third preset current threshold for a time greater than a third preset time.
  • the battery is in a charging state.
  • the charging state of the battery may be determined based on the current over a period of time, that is, if the third determining module 806 detects When the time that the current is greater than or equal to the third preset current threshold is greater than the third preset time, it is determined that the battery is in a charging state to improve the accuracy of judging the charging state of the battery. For the judgment of the discharge state, this current is the discharge current.
  • the device 80 for determining the charging state of the battery may execute the method for determining the charging state of the battery provided by the embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.
  • the method for determining the charging state of a battery provided in the embodiment of the present invention.
  • FIG. 9 is a schematic diagram of a chip hardware structure according to an embodiment of the present invention.
  • the chip may be a main control chip (such as an MCU) of various smart batteries.
  • the chip 90 includes:
  • One processor 901 is taken as an example in FIG. 9.
  • the processor 901 and the memory 902 may be connected through a bus or in other manners.
  • the connection through the bus is taken as an example.
  • the memory 902 is a non-volatile computer-readable storage medium, and may be used to store a non-volatile software program, a non-volatile computer executable program, and a module, such as a method for determining a charging state of a battery in an embodiment of the present invention.
  • Corresponding program instructions / modules for example, the power acquisition module 801, the first determination module 802, the first determination module 803, the second determination module 804, the second determination module 805, and the third determination module 806 shown in FIG. 8) .
  • the processor 901 executes various functional applications and data processing of the chip 90 by running non-volatile software programs, instructions, and modules stored in the memory 902, that is, a method for determining a state of charge of a battery in the method embodiment .
  • the memory 902 may include a storage program area and a storage data area, where the storage program area may store an operating system and application programs required for at least one function; the storage data area may store data created according to the use of the chip 90 and the like.
  • the memory 902 may include a high-speed random access memory, and may further include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage device.
  • the memory 902 may optionally include a memory remotely set relative to the processor 901, and these remote memories may be connected to the chip through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.
  • the one or more modules are stored in the memory 902, and when executed by the one or more processors 901, execute the method for determining a state of charge of a battery in the arbitrary method embodiment, for example, executing the above
  • the described method steps 701 to 706 in FIG. 7 implement the functions of modules 801-806 in FIG.
  • the chip 90 may execute the method for determining the state of charge of a battery in any of the method embodiments, and has function modules and beneficial effects corresponding to the execution method. For technical details that are not described in detail in the chip embodiments, reference may be made to the method for determining the charging state of a battery in the arbitrary method embodiments.
  • An embodiment of the present invention provides a computer program product.
  • the computer program product includes a computer program stored on a non-volatile computer-readable storage medium.
  • the computer program includes program instructions.
  • the program instructions When the program instructions are executed by a computer, At that time, the computer is caused to execute the method for determining a state of charge of a battery as described above. For example, step 701 to step 706 of the method in FIG. 7 described above are performed to implement the functions of modules 801 to 806 in FIG. 8.
  • An embodiment of the present invention provides a non-volatile computer-readable storage medium, where the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause a computer to perform the determination of a battery as described above.
  • Method of charging status For example, step 701 to step 706 of the method in FIG. 7 described above are performed to implement the functions of modules 801 to 806 in FIG. 8.
  • FIG. 10 is a schematic diagram of a battery according to an embodiment of the present invention.
  • the battery 100 includes the chip 90 and at least one battery cell 91 as described above.
  • the battery 100 may be a smart battery, that is, the chip 90 is an integrated circuit (IC) protection board or a microprocessor (MCU) with a certain logic control capability.
  • the at least one battery cell 91 is connected to the chip 90, and the chip 90 is configured to determine a charging state of the battery 100, and when the chip 90 determines that the battery 100 is in a charging state, the power is transmitted through a control circuit.
  • the conduction of the charging circuit causes the battery 100 to enter a charging state, so that an external charger can charge the battery 100, thereby ensuring the stability and reliability of the function of the battery 100, and further ensuring the safety of the aircraft flight.
  • FIG. 11 is a schematic diagram of an aircraft according to an embodiment of the present invention.
  • the aircraft 110 includes: the battery 100 described above.
  • the battery 100 is used to provide power.
  • the battery 100 is used to determine its own charging state, and when it is determined that it is in the charging state, it enters the charging state so that the external charger can charge the battery 100, thereby ensuring the function of the battery 100. Stability and reliability, thereby ensuring the safety of flight of the aircraft 110.
  • the device embodiments described above are only schematic, and the modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical Modules can be located in one place or distributed to multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the objective of the solution of this embodiment.
  • the embodiments can be implemented by means of software plus a general hardware platform, and of course, also by hardware.
  • the program can be stored in a computer-readable storage medium, and the program is being executed. In this case, the process of the embodiment of each method may be included.
  • the storage medium may be a read-only memory (ROM) or a random access memory (RandomAccess Memory, RAM).

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  • 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 et un dispositif permettant de déterminer l'état de charge d'une batterie (100), ainsi qu'une puce, ladite batterie (100) et un aéronef associés. Le procédé selon l'invention consiste : à acquérir, lorsqu'il est détecté qu'une batterie (100) se trouve en état de fonctionnement, la quantité électrique de courant de la batterie (100) ; à déterminer si ladite quantité est inférieure à un premier seuil de quantité électrique prédéfini (102) ; si tel est le cas, à déterminer l'état de charge de la batterie (100) en fonction du temps pendant lequel un courant de la batterie (100) se trouve dans une plage de courant prédéfinie (103) ; et, lorsque la quantité électrique de courant est supérieure ou égale au premier seuil de quantité électrique prédéfini, à déterminer l'état de charge de la batterie (100) en fonction d'un résultat de comparaison obtenu par comparaison d'une tension de borne de sortie de la batterie (100) avec un seuil de tension prédéfini (104). Le procédé selon l'invention permet d'améliorer la précision de la détermination de l'état de charge de la batterie (100).
PCT/CN2019/103052 2018-08-30 2019-08-28 Procédé et dispositif permettant de déterminer l'état de charge d'une batterie, et puce, batterie et aéronef associés WO2020043128A1 (fr)

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