WO2020015502A1 - Procédé et dispositif de suivi de décharge excessive de batterie, puce, batterie, et aéronef - Google Patents

Procédé et dispositif de suivi de décharge excessive de batterie, puce, batterie, et aéronef Download PDF

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Publication number
WO2020015502A1
WO2020015502A1 PCT/CN2019/092792 CN2019092792W WO2020015502A1 WO 2020015502 A1 WO2020015502 A1 WO 2020015502A1 CN 2019092792 W CN2019092792 W CN 2019092792W WO 2020015502 A1 WO2020015502 A1 WO 2020015502A1
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voltage
tracking
battery
minimum
preset
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PCT/CN2019/092792
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English (en)
Chinese (zh)
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刘玉华
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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 WO2020015502A1 publication Critical patent/WO2020015502A1/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 tracking battery overdischarge, a device, chip, battery, and aircraft for tracking battery overdischarge.
  • Batteries are an essential part of the operation of various electronic devices, such as aircraft. Take the aircraft as an example. Electricity is the core of the aircraft system. Whether it is the flight controller, radio transceiver module, motor, ESC, etc., it is necessary to provide power for the aircraft battery to discharge it to meet the use of the aircraft in different environments. Claim. For example, during aerial photography, if a strong wind is encountered, the battery needs to be compensated for high current discharge to ensure the position of the aircraft. During the discharge of the aircraft battery, overdischarge may occur due to various factors. Over-discharge of the battery means over-discharge, which may cause damage to the electrode active material and loss of reaction ability. In the slightest case, the battery may be damaged, which shortens the battery life. In the worst case, the voltage is too low, which may lead to aircraft bombers.
  • the battery When the battery is over-discharged, in order to protect the battery from being destroyed, the battery is usually disconnected from the load automatically by the battery over-discharge protection device or over-discharge protection circuit, and the battery power is turned off to protect the battery and extend the battery life. .
  • the battery over-discharge protection device or over-discharge protection circuit By turning off the battery power supply when an over-discharge occurs, although the battery can be protected, the lack of a method for tracking the voltage during the over-discharge of the battery cannot provide a basis for the analysis of the cause of the over-discharge of the battery.
  • the main purpose of the present invention is to provide a method and device for tracking battery overdischarge, a chip, a battery and an aircraft, which can track the voltage during the battery overdischarge, thereby providing a basis for the analysis of the cause of the battery overdischarge.
  • an embodiment of the present invention provides a method for tracking overdischarge of a battery.
  • the battery includes at least one battery cell, and the method includes:
  • the minimum cell voltage is less than a preset first voltage threshold
  • the voltage of each cell in the at least one cell is tracked, and the minimum cell voltage is the minimum voltage obtained in the at least one cell.
  • the voltage of the battery cell, the preset first voltage threshold value is a threshold voltage value at which the battery is over-discharged;
  • the current minimum cell voltage is compared with the minimum cell voltage of the previous preset time
  • an embodiment of the present invention further provides a device for tracking overdischarge of a battery.
  • the battery includes at least one battery cell, and the device includes:
  • An obtaining module configured to obtain a voltage of each of the at least one battery cell
  • a tracking module configured to track the voltage of each of the at least one cell when the minimum cell voltage is less than a preset first voltage threshold, and the minimum cell voltage is the obtained at least one The voltage of the battery cell with the lowest voltage in the battery cell, the preset first voltage threshold value is a threshold voltage value at which the battery is over-discharged;
  • a comparison module configured to compare the current minimum cell voltage with the minimum cell voltage of a previous preset time during the tracking process
  • a first tracking stop module configured to stop tracking when the comparison module determines that the current minimum cell voltage is greater than the minimum cell voltage of a previous preset time, and The cell voltage is determined as the minimum over-discharge voltage
  • the recording module is configured to update the number of over-discharges of the battery, and record the minimum over-discharge voltage and over-discharge influence parameters corresponding to the minimum over-discharge voltage.
  • 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, so that the at least one processor can perform the method for tracking battery over-discharge 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 tracking over-discharge 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 The method of tracking battery overdischarge 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 voltage of each cell in the at least one cell is tracked, and when the current minimum cell voltage is greater than When the minimum cell voltage for a preset time is reached, the tracking is stopped to track the battery over-discharge; and the related parameters of the minimum over-discharge voltage during the tracking are recorded to analyze the cause of the battery over-discharge Provide a basis for subsequent analysis of the cause of over-discharge of the battery, thereby enhancing the robustness and reliability of the battery function, and thereby ensuring the flight safety of the aircraft using the battery.
  • FIG. 1 is a schematic flowchart of a method for tracking overdischarge of a battery according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of another method for tracking battery overdischarge provided by an embodiment of the present invention
  • FIG. 3 is a detailed flowchart of a method for tracking battery overdischarge provided by an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a voltage fluctuation of a battery cell according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a device for tracking over-discharge of a battery according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of another device for tracking battery overdischarge provided by an embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a hardware structure of a chip according to an embodiment of the present invention.
  • FIG. 8 is a schematic diagram of a battery provided by an embodiment of the present invention.
  • FIG. 9 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 tracking battery overdischarge provided by an embodiment of the present invention.
  • the method for tracking overdischarge of a battery can be used to track overdischarge of various batteries, such as a lithium battery, a nickel-cadmium battery, or other storage batteries.
  • the battery can be applied to various devices including the battery, for example, to an aircraft, an electric vehicle, and the like.
  • the following description of the invention uses an aircraft as an example of a device containing the battery.
  • the method for tracking overdischarge of a battery may be implemented by any suitable type of chip, such as a main control chip (such as MCU) of a battery, which has a certain logic operation capability and can implement the function of tracking overdischarge of the battery.
  • a main control chip such as MCU
  • the method for tracking over-discharge of a battery includes:
  • a battery includes at least one battery cell, that is, the number of battery cells in the battery may be one or more.
  • Each of the at least one battery cell may be connected in series, parallel, or series-parallel to form an energy storage unit with sufficient energy and power to perform the intended function of the battery.
  • power is provided to each system in the aircraft system through serial, parallel, or series-parallel connection of each of the at least one battery.
  • the battery's main control chip will monitor the The voltage of each of the at least one battery is described to obtain the voltage of each of the at least one battery.
  • the main control chip of the battery may measure the voltage of each of the at least one battery cell by means of a voltage measuring device such as a fuel gauge.
  • the minimum cell voltage is a voltage of a cell having the smallest voltage among the at least one cell obtained.
  • the at least one battery cell includes: “Cell 1", “Cell 2", “Cell 3” and “Cell 4". If the battery is discharged at a certain time (the battery may be discharged) At any time during the process), the obtained voltage of "Cell 1" is 4.48V, the voltage of "Cell 2" is 3.64V, the voltage of "Cell 3" is 4.24V, and the voltage of "Cell 4" It is 4.22V, then the minimum cell voltage at this moment is the voltage of "cell 2", which is 3.64V.
  • the main control chip of the battery compares the minimum cell voltage at various times during the discharging process of the battery with a preset first voltage threshold to determine whether an over-discharge has occurred during the discharging process of the battery.
  • the first voltage threshold is a threshold voltage value at which the battery is over-discharged.
  • the preset first voltage threshold may be a discharge cut-off voltage of the battery cell.
  • Discharge cut-off voltage refers to the minimum operating voltage during which the voltage drops to the point where it is not appropriate to continue discharging. According to different battery types and different discharge conditions, the requirements for battery capacity and life are different.
  • the discharge cut-off voltage of the battery cell discharge is also different, that is, the preset first voltage threshold can be pre-configured at The battery's main control chip can also be customized according to needs.
  • the preset first voltage threshold may be 3.0V.
  • the preset first voltage threshold may also be slightly greater than 3.0V, for example, the preset first voltage threshold is 3.2V, so as to occur for subsequent batteries under the allowed conditions.
  • the analysis of the cause of the overdischarge provides as complete a data basis as possible.
  • the main control chip of the battery detects that the minimum cell voltage is less than a preset first voltage threshold, it can be characterized that an over-discharge has occurred during the discharge of the battery, and at this time, each of the at least one cell is started.
  • the voltage is tracked.
  • the main control chip of the battery can track the voltage of each battery cell at a preset tracking frequency, and the preset tracking frequency can be set as required.
  • the preset tracking frequency is 1 Hz, that is, the voltage of each cell is tracked every 1S, and the minimum cell voltage per second is obtained during the tracking process.
  • the current minimum cell voltage is compared with the minimum cell voltage of the previous preset time.
  • the last preset time is based on the current time. Taking the battery's main control chip to track once per second as an example, if the current minimum cell voltage is the minimum cell voltage at the 5S, the previous preset time is Let the minimum cell voltage at time be the minimum cell voltage at 4S. During the tracking process, the battery's main control chip compares the currently obtained minimum cell voltage with the minimum cell voltage obtained at the previous preset time to determine the minimum discharge voltage during the tracking process.
  • the battery's main control chip continues to keep track of the voltage of each cell; when the current When the minimum cell voltage is greater than the minimum cell voltage of the last preset time, the main control chip of the battery stops tracking, and at this time, the minimum cell voltage of the last preset time is determined as the minimum over-discharge voltage. For example, when the current minimum cell voltage is 2.85V and the minimum cell voltage at the last preset time is 2.8V, the battery's main control chip stops tracking the voltage of each cell. The minimum cell voltage of 2.8V is the minimum over-discharge voltage during this tracking process.
  • the main control chip of the battery updates the number of over-discharges of the battery. Specifically, the number of over-discharges of the battery is increased by one on the original basis. For example, if the number of times of tracking the battery over-discharged last time is 10, the number of over-discharges of the corresponding battery after the current tracking stop is 11.
  • the minimum over-discharge voltage and the over-discharge influence parameters corresponding to the minimum over-discharge voltage are recorded, so as to provide a basis for the analysis of the cause of the over-discharge of the battery, and to serve as a retrospective and The reference of source inspection is to facilitate the subsequent analysis of the cause of the battery overdischarge, thereby enhancing the robustness and reliability of the battery function, and thereby ensuring the flight safety of the aircraft using the battery.
  • the over-discharge influence parameter includes at least one of the following parameters: temperature, battery cycle times, and the like. This temperature can be the ambient temperature. In some other embodiments, the temperature may also be the temperature of the battery.
  • the number of battery cycles indicates the total number of all and partial discharge cycles in the entire battery life. By recording the number of battery cycles, it is easy to trace the period of overdischarge, so as to determine how much the battery is more likely to be overdischarged.
  • the voltage of each cell in the at least one cell is tracked, and when the current minimum cell voltage is greater than a previous preset
  • the tracking is stopped to track the battery over-discharge; and the parameters related to the minimum over-discharge voltage during the tracking are recorded to provide a basis for the analysis of the cause of the battery over-discharge In order to analyze the cause of the overdischarge of the battery in the future, so as to enhance the robustness and reliability of the battery function, thereby ensuring the flight safety of the aircraft using the battery.
  • FIG. 2 is a schematic flowchart of another method for tracking battery overdischarge provided by an embodiment of the present invention.
  • the method for tracking overdischarge of a battery can be used to track overdischarge of various batteries, such as a lithium battery, a nickel-cadmium battery, or other storage batteries.
  • the battery can be applied to various devices including the battery, for example, to an aircraft, an electric vehicle, and the like.
  • the following description of the invention uses an aircraft as an example of a device containing the battery.
  • the method for tracking overdischarge of a battery may be implemented by any suitable type of chip, such as a main control chip (such as MCU) of a battery, which has a certain logic operation capability and can implement the function of tracking overdischarge of the battery.
  • a main control chip such as MCU
  • the method for tracking over-discharge of a battery includes:
  • FIG. 3 is a detailed flowchart of a method for tracking battery overdischarge provided by an embodiment of the present invention.
  • the initialization configuration includes: the initialization of the tracking identifier.
  • the tracking identifier is used to characterize a tracking status of the main control chip of the battery tracking the voltage of each of the at least one battery cell, so as to control the start of tracking based on the tracking identifier.
  • the initialization configuration further includes: initializing the minimum cell voltage at an initial preset time. Because the minimum cell voltage during the tracking process cannot be determined before tracking is started, the minimum cell voltage Cell_Min_Temp at the initial preset time before the tracking is not started is initialized.
  • the register used by the battery is usually a 16-bit register, and the maximum value it can store is 65535. Therefore, as shown in FIG. 3, the Cell_Min_Temp initialization value is 65535.
  • the battery Due to the special nature of the battery, when the battery itself turns off the voltage fuel gauge for measuring each of the at least one battery cell due to the power consumption control strategy, before the fuel gauge is not reactivated, after the battery is turned on, the battery's The voltage of each of the at least one battery cell obtained by the main control chip is 0. If the battery over-discharging is tracked at this time, it will lead to misjudgment, which will provide analysis for the cause of battery over-discharge. The information is unreliable.
  • the battery main control chip obtains the voltage of each of the at least one battery cell, it needs to determine whether the fuel gauge is activated, that is, whether the fuel gauge is in a normal working state, and only works when the fuel gauge is activated. Only then can each subsequent cell voltage be obtained.
  • whether a fuel gauge is activated can be determined by judging whether a discharge current exists.
  • a discharge current there is no discharge current when the fuel gauge is not activated.
  • a preset Current threshold such as 10mA
  • the main control chip of the battery obtains the voltage of each of the at least one battery cell, including: when the discharge current exists, obtaining the voltage of each of the at least one battery cell. . Only when there is a discharge current, follow-up tracking is performed in order to prevent misjudgment of the battery over-discharge caused by the fuel gauge not being activated, and provide a reliable basis for subsequent analysis.
  • the tracking stops at each time. Before the next tracking, the main control chip of the battery needs to wait for the minimum cell voltage (Cell_Min in FIG. 3) to be higher than a preset fourth voltage threshold before starting a new tracking.
  • Cell_Min the minimum cell voltage
  • point C is the minimum overdischarge voltage during the tracking overdischarge point during one discharge
  • point D is the minimum overdischarge voltage during the tracking overdischarge point during another discharge.
  • points B, C, and D are presence Same during discharge.
  • the main control chip of the battery needs to wait for the minimum cell voltage to be higher than a preset fourth voltage threshold before starting a new tracking.
  • the preset fourth voltage threshold can be set to 3.2V, that is, when the minimum battery voltage is exceeded before the next tracking.
  • the preset fourth voltage threshold may also be customized according to requirements.
  • tracking the voltage of each cell in the at least one cell includes: when the minimum cell voltage is less than the preset first voltage threshold and When the tracking status represented by the tracking identifier is to start tracking, the voltage of each of the at least one battery cell is tracked.
  • the battery In order to prevent the main control chip of the battery from tracking the voltage of each cell under abnormal working conditions and affecting subsequent analysis, the battery must ensure that the battery is in the process of tracking the voltage of each cell.
  • the main control chip is in a normal working state. Because the working current of the battery's main control chip is provided by the battery, during the tracking process, the total voltage of the battery needs to be monitored in real time to ensure that the battery's main control chip is in a normal working state.
  • the total voltage of the battery refers to the total voltage flowing through the battery, which is different from the voltage of each cell of the battery.
  • the preset third voltage threshold can be set. Set to 3.6V to determine if the battery's main control chip is in a normal working state.
  • the battery in order to ensure the normal operation of the battery's main control chip, the battery usually includes a voltage conversion device connected to the battery's main control chip.
  • the voltage conversion device can convert high voltage to low voltage, so that even the battery When the total voltage exceeds the preset third voltage threshold, it can also be converted into a voltage that can make the battery's main control chip work normally, and when the total voltage of the battery is lower than the preset third voltage threshold, the battery's main voltage cannot be guaranteed. Control chip works normally.
  • the main control chip of the battery determines that the total voltage of the battery is less than a preset third voltage threshold, the tracking is stopped, and the total voltage of the battery is less than the preset third voltage
  • the minimum cell voltage at the threshold is determined as the minimum over-discharge voltage in order to record the minimum over-discharge voltage and the over-discharge influence parameter corresponding to the minimum over-discharge voltage; otherwise, a subsequent comparison judgment is performed.
  • the preset second voltage threshold may be 0, or approximately 0. In the process of voltage tracking, the minimum value that the minimum cell voltage can reach is 0. Therefore, when the minimum cell voltage is equal to or approximately 0, there is no need to compare the minimum cell voltage before and after, and the tracking can be stopped.
  • the minimum cell voltage at the last preset time is determined as the minimum over-discharge voltage; otherwise, subsequent comparison and judgment are performed.
  • step 207 when the minimum cell voltage during the tracking process is equal to a preset second voltage threshold, tracking is stopped and the preset second voltage threshold is determined as the minimum over-discharge voltage, which specifically includes: When the total voltage of the battery is greater than or equal to a preset third voltage threshold and the minimum cell voltage during tracking is equal to a preset second voltage threshold, stop tracking, and set the preset second voltage The threshold is determined as the minimum overdischarge voltage. For details, see the process in FIG. 3.
  • the current minimum cell voltage is compared with the minimum cell voltage of the previous preset time.
  • the voltage of each cell in the at least one cell is tracked, and when the current minimum cell voltage is greater than a previous preset
  • the tracking is stopped to track the battery over-discharge; and the parameters related to the minimum over-discharge voltage during the tracking are recorded to provide a basis for the analysis of the cause of the battery over-discharge.
  • FIG. 5 is a schematic diagram of a device for tracking over-discharge of a battery according to an embodiment of the present invention.
  • the device 50 for tracking over-discharge of a battery can be used to track over-discharge of various batteries, such as a lithium battery, a nickel-cadmium battery, or other storage batteries.
  • the battery over-discharging device 50 may be configured in any suitable type of chip with a certain logic operation capability, such as a main control chip configured in a battery.
  • the apparatus 50 for tracking over-discharge of a battery includes: an acquisition module 501, a tracking module 502, a comparison module 503, a first stop tracking module 504, and a recording module 505.
  • the obtaining module 501 is configured to obtain a voltage of each of the at least one battery cell.
  • the battery includes at least one battery cell, and each battery cell is connected in series, parallel, or series-parallel to provide power for various devices, such as an aircraft.
  • the obtaining module 501 monitors the voltage of each of the at least one battery cell in real time to obtain the voltage of each of the at least one battery cell.
  • the obtaining module 501 may measure a voltage of each of the at least one battery cell by using a voltage measuring device such as a fuel gauge.
  • the tracking module 502 is configured to track the voltage of each of the at least one battery cell when the minimum battery cell voltage is less than a preset first voltage threshold.
  • the minimum cell voltage is a voltage of the cell having the smallest voltage among the at least one cell obtained.
  • the tracking module 502 compares the minimum cell voltage at various times during the battery discharging process with a preset first voltage threshold to determine whether an over-discharge has occurred during the battery discharging process.
  • the first voltage threshold is a threshold voltage value at which the battery is over-discharged.
  • the preset first voltage threshold may be a discharge cut-off voltage of the battery cell.
  • the battery voltage is lower than 2.4V, some materials will start to be destroyed. And because the battery will self-discharge, the voltage will be lower the longer the discharge, so it is best not to stop at 2.4V during discharge.
  • the preset first voltage threshold may be 3.0V.
  • the preset first voltage threshold may also be slightly greater than 3.0V, for example, the preset first voltage threshold is 3.2V, so as to occur for subsequent batteries under the allowed conditions.
  • the analysis of the cause of the overdischarge provides as complete a data basis as possible.
  • the tracking module 502 When the tracking module 502 detects that the minimum cell voltage is less than a preset first voltage threshold, it can indicate that an over-discharge occurred during the battery discharge process. At this time, the voltage of each cell in the at least one cell is started. For tracking.
  • the tracking module 502 can track the voltage of each battery cell at a preset tracking frequency, and the preset tracking frequency can be set as required.
  • the preset tracking frequency is 1 Hz, that is, the voltage of each cell is tracked every 1S, and the minimum cell voltage per second is obtained during the tracking process.
  • the comparison module 503 is configured to compare the current minimum cell voltage with the minimum cell voltage at a previous preset time during the tracking process.
  • the last preset time is based on the current time. Taking the battery's main control chip to track once per second as an example, if the current minimum cell voltage is the minimum cell voltage at the 5S, the previous preset time is Let the minimum cell voltage at time be the minimum cell voltage at 4S.
  • the first stop tracking module 504 is configured to stop the tracking when the comparison module 503 determines that the current minimum cell voltage is greater than the minimum cell voltage of a previous preset time, and updates the previous Set the minimum cell voltage for the time as the minimum over-discharge voltage.
  • the tracking module 502 continues to keep track of the voltage of each cell; when the current minimum cell voltage is When the core voltage is greater than the minimum cell voltage of the last preset time, the first stop tracking module 504 stops tracking, and at this time, the minimum cell voltage of the last preset time is determined as the minimum over-discharge voltage. For example, when the current minimum cell voltage is 2.85V and the minimum cell voltage at the last preset time is 2.8V, the battery's main control chip stops tracking the voltage of each cell. The minimum cell voltage of 2.8V is the minimum over-discharge voltage during this tracking process.
  • the recording module 505 is configured to update the number of over-discharges of the battery, and record the minimum over-discharge voltage and over-discharge influence parameters corresponding to the minimum over-discharge voltage.
  • the recording module 505 updates the number of over-discharges of the battery. Specifically, the number of over-discharges of the battery is increased by one on the original basis. For example, if the number of times of tracking the battery over-discharged last time is 10, the number of over-discharges of the corresponding battery after the current tracking stop is 11.
  • the recording module 505 records the minimum over-discharge voltage and the over-discharge influence parameter corresponding to the minimum over-discharge voltage, so as to provide a basis for the analysis of the cause of the over-discharge of the battery as a problem of over-discharge.
  • the reference for traceability and source inspection in order to analyze the cause of overdischarge of the battery in the future, so as to enhance the robustness and reliability of the battery function, and thus ensure the flight safety of the aircraft using the battery.
  • the over-discharge influence parameter includes at least one of the following parameters: temperature, battery cycle times, and the like. This temperature can be the ambient temperature. In some other embodiments, the temperature may also be the temperature of the battery.
  • the recording module 505 records the temperature corresponding to the minimum overdischarge voltage during the battery overdischarge, which can provide an important basis for the analysis of the cause of the battery overdischarge. In order to analyze the impact of temperature on battery over-discharge later.
  • the number of battery cycles indicates the total number of all and partial discharge cycles in the entire battery life. By recording the number of battery cycles, it is easy to trace the period of overdischarge, so as to determine how much the battery is more likely to be overdischarged.
  • the device 50 for tracking over-discharge of a battery can execute the method for tracking over-discharge of a battery provided by the embodiment of the present invention, and has function modules and beneficial effects corresponding to the execution method.
  • the method for tracking battery overdischarge provided in the embodiment of the present invention.
  • FIG. 6 is a schematic diagram of another device for tracking battery overdischarge provided by an embodiment of the present invention.
  • the device 60 for tracking over-discharge of a battery can be used to track over-discharge of various batteries, such as a lithium battery, a nickel-cadmium battery, or other storage batteries.
  • the battery over-discharging device 60 may be configured in any suitable type of chip with a certain logic operation capability, such as a main control chip configured in a battery.
  • the device 60 for tracking over-discharge of a battery includes: an initialization setting module 601, a third judgment module 602, an acquisition module 603, a state transition module 604, a tracking module 605, a second judgment module 606, and a third tracking stop module. 607.
  • the initialization setting module 601 is configured to initialize the tracking identifier so that the tracking status represented by the tracking identifier is ready for tracking.
  • the tracking identifier is used to characterize a tracking state of tracking the voltage of each of the at least one battery cell.
  • the initialization setting module 601 performs initialization configuration.
  • the initialization configuration includes: the initialization of the tracking identifier.
  • the tracking mark is used to characterize the tracking status of the battery's main control chip tracking the voltage of each battery cell, so as to control the start of tracking based on the tracking mark.
  • the initialization of the tracking identifier by the initialization setting module 601 makes the tracking status represented by the tracking identifier to be ready for tracking.
  • the initialization configuration further includes: initializing the minimum cell voltage at an initial preset time. Because the minimum cell voltage in the tracking process cannot be determined before the tracking is started, the minimum cell voltage at the initial preset time before the tracking is not started is initialized.
  • the register used by the battery is usually a 16-bit register, and the maximum value that can be stored is 65535. Therefore, the initialization value is 65535.
  • the third determination module 602 is configured to determine whether a discharge current exists.
  • the three determination modules 602 determine whether the fuel gauge is activated, that is, whether the fuel gauge is in a normal working state, and the subsequent acquisition of each cell voltage can be performed only when the fuel gauge is activated and works normally. Specifically, the third determination module 602 determines whether the fuel gauge is activated by determining whether a discharge current exists.
  • the third judgment module 602 can determine whether the discharge current is greater than a preset current threshold (for example, 10 mA) to determine whether a discharge current exists. Specifically, when the discharge current is greater than the current threshold, it is determined that a discharge current exists, that is, the fuel gauge is activated, and subsequent cell voltage can be obtained; otherwise, it is determined that there is no discharge current, that is, the fuel gauge is not activated.
  • a preset current threshold for example, 10 mA
  • the obtaining module 603 is configured to obtain a voltage of each of the at least one battery cell.
  • the obtaining module 603 is specifically configured to: when the discharge current exists, obtain a voltage of each of the at least one battery cell. Only when the discharge current is present, the acquisition module 603 performs subsequent tracking in order to prevent misjudgment of the battery over-discharge caused by the fuel gauge not being activated, and provide a reliable basis for subsequent analysis.
  • the state conversion module 604 is configured to change the tracking state represented by the tracking identifier to start tracking when the minimum cell voltage is greater than a preset fourth voltage threshold.
  • the preset fourth voltage threshold may be 3.2V.
  • the preset fourth voltage threshold may also be customized according to requirements.
  • the tracking module 605 is configured to track the voltage of each of the at least one cell when the minimum cell voltage is less than a preset first voltage threshold.
  • the minimum cell voltage is an obtained voltage of the cell with the smallest voltage among the at least one cell
  • the preset first voltage threshold is a threshold voltage value at which the battery is over-discharged.
  • the tracking module 605 is specifically configured to track the voltage of each of the at least one battery cell when the minimum battery cell voltage is less than a preset first voltage threshold and the tracking status represented by the tracking identifier is starting tracking.
  • the second determining module 606 is configured to determine whether the total voltage of the battery is less than a preset third voltage threshold during the tracking process.
  • the third stop tracking module 607 is configured to stop tracking when the second determination module 606 determines that the total voltage of the battery is less than a preset third voltage threshold, and reduce the total voltage of the battery to less than The minimum cell voltage at the preset third voltage threshold is determined as the minimum over-discharge voltage.
  • the first determining module 608 is configured to determine whether the minimum cell voltage during the tracking process is equal to a preset second voltage threshold.
  • the second stop tracking module 609 is configured to stop the tracking when the first judgment module 608 determines that the minimum cell voltage during the tracking process is equal to a preset second voltage threshold, and sets the preset The second voltage threshold is determined as the minimum over-discharge voltage.
  • the preset second voltage threshold may be 0, or approximately 0.
  • the minimum value that the minimum cell voltage can reach is 0, so when the minimum cell voltage is equal to or approximately 0, there is no need to compare the minimum cell voltage before and after, and the second stop tracking
  • the module 609 can stop tracking, and determine the minimum battery voltage at the last preset time as the minimum over-discharge voltage; otherwise, perform subsequent comparison and judgment.
  • the second stop tracking module 609 is specifically configured to: when the second determination module 606 determines that the total voltage of the battery is greater than or equal to a preset third voltage threshold, and the first determination module 608 determines that the When the minimum cell voltage during tracking is equal to a preset second voltage threshold, tracking is stopped, and the preset second voltage threshold is determined as the minimum over-discharge voltage.
  • the comparison module 6010 is configured to compare the current minimum cell voltage with the minimum cell voltage at a previous preset time during the tracking process.
  • the first stop tracking module 6011 is configured to stop tracking when the current minimum cell voltage is greater than the minimum cell voltage of a previous preset time, and set the minimum cell voltage of the last preset time to be Determined as the minimum overdischarge voltage.
  • the first tracking stop module 6011 is specifically configured to: when the first judging module 608 judges that the minimum cell voltage during tracking is not equal to a preset second voltage threshold, and the comparison module 6010 judges that When the current minimum cell voltage is greater than the minimum cell voltage of the last preset time, tracking is stopped, and the minimum cell voltage of the last preset time is determined as the minimum over-discharge voltage.
  • the recording module 6012 is configured to update the number of over-discharges of the battery, and record the minimum over-discharge voltage and over-discharge influence parameters corresponding to the minimum over-discharge voltage.
  • the over-discharge influence parameter includes at least one of the following parameters: temperature, battery cycle times.
  • the device for tracking over-discharge of a battery 60 may execute the method for tracking over-discharge of a battery provided by the embodiment of the present invention, and has functional modules and beneficial effects corresponding to the execution method.
  • the method for tracking battery overdischarge provided in the embodiment of the present invention.
  • FIG. 7 is a schematic diagram of a chip hardware structure according to an embodiment of the present invention, where the chip may be a main control chip of various smart batteries and the like. As shown in FIG. 7, the chip 70 includes:
  • the processor 701 and the memory 702 may be connected through a bus or in other manners. In FIG. 7, the connection through the bus is taken as an example.
  • the memory 702 is a non-volatile computer-readable storage medium, and can be used to store non-volatile software programs, non-volatile computer executable programs, and modules, as corresponding to the method for tracking battery over-discharge in the embodiment of the present invention.
  • Program instructions / modules for example, the initialization setting module 601, the third judgment module 602, the acquisition module 603, the state transition module 604, the tracking module 605, the second judgment module 606, and the third stop tracking module 607 shown in FIG. 6 ,
  • the processor 701 executes various functional applications and data processing of the chip by running non-volatile software programs, instructions, and modules stored in the memory 702, that is, a method for tracking the battery over-discharge in the method embodiment.
  • the memory 702 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 chip usage, and the like.
  • the memory 702 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 702 may optionally include a memory remotely set relative to the processor 701, 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 702, and when executed by the one or more processors 701, execute the method for tracking battery overdischarge in any of the method embodiments, for example, performing the above description Steps 201 to 2012 of the method in FIG. 2 implement the functions of modules 601-6012 in FIG. 6.
  • the chip can execute the method for tracking battery overdischarge provided in the method embodiment, and has corresponding function modules and beneficial effects of executing the method.
  • the chip can execute the method for tracking battery overdischarge provided in the method embodiment, and has corresponding function modules and beneficial effects of executing the method.
  • 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 tracking battery overdischarge as described above. For example, the method steps 201 to 2012 in FIG. 2 described above are performed to implement the functions of modules 601-6012 in FIG. 6.
  • 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 battery tracking process described above.
  • Discharge method For example, the method steps 201 to 2012 in FIG. 2 described above are performed to implement the functions of modules 601-6012 in FIG. 6.
  • FIG. 8 is a schematic diagram of a battery according to an embodiment of the present invention.
  • the battery 80 includes the chip 70 and at least one battery cell 81 as described above.
  • the battery 80 may be a smart battery, that is, the chip 70 is an integrated circuit (IC) protection board or a microcontroller unit (MCU) with a certain logic control capability.
  • the at least one battery cell 81 is connected to the chip 70.
  • the chip 70 is used to track the over-discharge of the battery 80, and records the relevant parameters of the minimum over-discharge voltage during the tracking process, so that the battery 80 is
  • the analysis of the cause of the overdischarge provides a basis for subsequent analysis of the cause of the overdischarge of the battery 80, thereby enhancing the robustness and reliability of the battery function, and thereby ensuring the flight safety of the aircraft using the battery.
  • FIG. 9 is a schematic diagram of an aircraft according to an embodiment of the present invention.
  • the aircraft 90 includes a battery 80 as described above.
  • the battery 80 is used to provide power, and the battery 80 is used to track its own over-discharge, and to record the relevant parameters of the minimum over-discharge voltage during the tracking process, so as to account for the cause of the over-discharge of the battery 80
  • the analysis provides a basis for subsequent analysis of the cause of the over-discharge of the battery 80, thereby enhancing the robustness and reliability of the battery function, thereby ensuring the safety of the flight of the aircraft 90.
  • the aircraft 90 includes, but is not limited to, an unmanned aerial vehicle, an unmanned ship, and the like.
  • 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 (Read-Only Memory, ROM) or a random access memory (Random, Access 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

La présente invention concerne le domaine technique des batteries, un procédé et un dispositif de suivi de décharge excessive d'une batterie, une puce (70), une batterie (80) et un aéronef (90). La batterie (80) comprend au moins une cellule (81), et le procédé comprend : l'acquisition de la tension (101, 203) de la cellule ou des cellules (81); quand la tension minimale de cellule est inférieure à un premier seuil de tension prédéfini, le suivi de la tension de la cellule ou des cellules (81), la tension minimale de cellule étant la tension acquise (102, 205) de la cellule ayant la tension minimale parmi chaque cellule (81); quand la tension minimale de cellule de l'instant est supérieure à la tension minimale de cellule à un moment prédéfini antérieur, l'arrêt du suivi et la détermination de la tension minimale de cellule au moment prédéfini antérieur comme étant la tension minimale de décharge excessive (104, 2011); et la mise à jour du nombre de décharges excessives de la batterie, et l'enregistrement de la tension minimale de décharge excessive et des paramètres d'influence de décharge excessive (105, 2012) correspondant à la tension minimale de décharge excessive. La tension pendant la décharge excessive d'une batterie peut être suivie au moyen d'un procédé de suivi de décharge excessive d'une batterie, ce qui fournit ainsi une base pour analyser la raison de la décharge excessive de la batterie.
PCT/CN2019/092792 2018-07-17 2019-06-25 Procédé et dispositif de suivi de décharge excessive de batterie, puce, batterie, et aéronef WO2020015502A1 (fr)

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CN109617167B (zh) * 2018-12-21 2021-06-01 深圳市道通智能航空技术股份有限公司 一种电池过放电警示方法、装置、电池及飞行器
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