WO2023070321A1 - 一种电池过流检测方法、电池管理系统及电池 - Google Patents

一种电池过流检测方法、电池管理系统及电池 Download PDF

Info

Publication number
WO2023070321A1
WO2023070321A1 PCT/CN2021/126448 CN2021126448W WO2023070321A1 WO 2023070321 A1 WO2023070321 A1 WO 2023070321A1 CN 2021126448 W CN2021126448 W CN 2021126448W WO 2023070321 A1 WO2023070321 A1 WO 2023070321A1
Authority
WO
WIPO (PCT)
Prior art keywords
current
battery
detection
threshold
temperature
Prior art date
Application number
PCT/CN2021/126448
Other languages
English (en)
French (fr)
Inventor
邹志婷
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2021/126448 priority Critical patent/WO2023070321A1/zh
Priority to EP21961697.6A priority patent/EP4317995A1/en
Priority to CN202180098357.6A priority patent/CN117321427A/zh
Publication of WO2023070321A1 publication Critical patent/WO2023070321A1/zh
Priority to US18/495,239 priority patent/US20240061048A1/en

Links

Images

Classifications

    • 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]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
    • G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
    • G01R19/16542—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies for batteries
    • 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]
    • G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • 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]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection

Definitions

  • the embodiments of the present application relate to the field of battery technology, and in particular, to a battery overcurrent detection method, a battery management system, and a battery.
  • Batteries are used as important energy storage and power supply equipment, for example, for new energy Power supply for cars or terminal equipment, etc., and store energy for solar panels.
  • the battery management system (BATTERY MANAGEMENT SYSTEM, BMS) is a protection and management unit specially designed for batteries. Specifically, the battery management system manages the charge and discharge of the battery, and performs cut-off protection for the battery when the battery fails (for example, an overcurrent fault, etc.). When the current of the battery is greater than the set threshold, it is determined that an overcurrent fault occurs, triggering disconnection of the battery from the external device (charging device or power supply device). It can be understood that the over-current detection is a prerequisite for determining the over-current fault. Therefore, the accuracy of the over-current detection is highly required, which directly affects the judgment of the over-current fault.
  • the present application provides a battery overcurrent detection method, a battery management system and a battery, which can accurately detect the battery overcurrent fault.
  • the present application provides a battery overcurrent detection method, including: obtaining the first current of the negative pole of the battery and the second current of the positive pole of the battery, and determining the current current from the first current and the second current according to the detection current determination strategy. Detect the current, obtain the charge and discharge state of the battery and the current temperature of the battery, and determine the current threshold according to the current temperature and charge and discharge state. If the current detection current exceeds the current threshold and meets the preset conditions, it is determined that the battery has an overcurrent fault.
  • the current detection current is determined from the first current of the battery negative pole and the second current of the battery positive pole, which can ensure the accuracy of the current detection current. Compared with directly using the first current or the second current, it can effectively prevent the currently detected current from being inaccurate due to the acquisition error of the first current or the second current.
  • the current threshold is determined according to the charge and discharge state of the battery and the current temperature, that is, the influence of the charge and discharge state and the current temperature on the current threshold is taken into account, for example, the current threshold required at high temperature and low temperature is different, and the state of charge and discharge are different.
  • the required current thresholds are different, so that the current threshold matches the charging and discharging state and the current temperature, which is more refined.
  • the current detection current is compared with the current threshold, if the current detection current exceeds the current threshold and meets the preset condition, it is determined that the battery has an overcurrent fault, so that the detection result is accurate. That is, by ensuring that the current detection current is accurate, setting an accurate and reasonable current threshold, and setting preset conditions during the comparison process, the overcurrent detection is more accurate and reliable, and false alarms are effectively reduced, so that the battery overcurrent fault can be accurately detected .
  • determining the current detection current from the first current and the second current according to the detection current determination strategy includes: performing validity checks on the first current and the second current respectively, A rationality check is performed on the first current and the second current, and the current detection current is determined according to a result of the validity check and a result of the rationality check.
  • the validity and rationality of the collected first current and the second current are respectively checked to obtain the validity and rationality of the first current and the validity and rationality of the second current. Then, the current detection current is determined accordingly, that is, the current detection current is determined after considering the validity and rationality of the first current and the validity and rationality of the second current, which is more accurate and beneficial to improve over-current detection accuracy.
  • the aforementioned verification of the validity of the first current and the second current respectively includes: if the first current is within the first preset measurement range, and the zero drift of the first current If the value is less than or equal to the first preset zero drift threshold, it is determined that the first current is valid; or, if the second current is within the second preset measurement range, and the zero drift value of the second current is less than or equal to the second preset zero drift threshold, it is determined that the second current is valid; wherein, the first preset measurement range is the measurement range of the first current sensor used to measure the first current, and the second preset measurement range is the second current sensor used to measure the second current. The measuring range of the current sensor.
  • the validity of the first current can be detected by combining the measurement range of the first current sensor and the first preset zero-drift threshold to accurately determine the validity of the first current. If the first current is valid, the first current is within the first preset measurement range and its zero drift value is reasonable, indicating that the first current sensor is normal, and the first current is acquired when the state of the first current sensor is stable, Receive less disturbance.
  • the validity of the second current can be accurately determined. If the second current is valid, the second current is within the second preset measurement range and its zero drift value is reasonable, indicating that the second current sensor is normal, and the second current is obtained when the state of the second current sensor is stable, Receive less disturbance.
  • the aforementioned checking of the rationality of the first current and the second current includes: if the difference between the first current and the second current is within a preset deviation range, then determining that the first current and the second current are reasonable; or, if the difference between the first current and the second current is not within a preset deviation range, determining that the first current and the second current are unreasonable.
  • the first current and the second current are the currents of the same loop in the same state, and are detected by different sensors.
  • the first current and the second current should be the same or similar. Therefore, by comparing the current Whether the difference between the first current and the second current is within the preset deviation range can determine the rationality of the first current and the second current, and ensure that the collected first current and the second current are in the same loop and in the same state In order to avoid the current detection current determined according to the first current and the second current being inaccurate due to the acquisition delay of the first current or the second current, and affecting the final detection result.
  • determining the current detected current according to the result of the validity check and the result of the rationality check includes: if both the first current and the second current are valid, and the first current and the second current are reasonable, then determine that the current detection current is the first current; or, if both the first current and the second current are valid, and the first current and the second current are unreasonable, then determine that the current detection current is the first current current and the larger value of the second current; or, if one of the first current and the second current is valid and the other is invalid, then it is determined that the current detection current is an effective current; or, if the first current and the second current are invalid, and the first current is greater than or equal to the upper limit of the first preset measurement range, and the second current is greater than or equal to the upper limit of the second preset measurement range, then it is determined that the current detected current is the higher value of the first current and the second current.
  • the current detection current is the detection current of the last detection cycle.
  • both the first current and the second current are invalid and the first current exceeds the upper limit of the measurement range of the first current sensor, and the second current exceeds the upper limit of the measurement range of the second current sensor, that is, both the first current and the second current exceed the limit
  • the current detection current is the larger value of the first current and the second current, so that the detection result is more cautious and the accuracy is higher.
  • the current detection current is the detection current of the previous detection cycle, so that the detection result is more cautious and more accurate. high.
  • the working principles of the first current sensor and the second current sensor are different, the first current sensor is powered by the first power supply unit, the second current sensor is powered by the second power supply unit, and the first current sensor is powered by the second power supply unit.
  • the power supply unit and the second power supply unit are independent of each other.
  • the first current sensor and the second current sensor have different working principles, they are equivalent to two current sensors of different types, which can prevent the failure of the two current sensors due to the same reason, that is, avoid the failure of the two current sensors. Sensor common cause failure.
  • the working principles of the first current sensor and the second current sensor are different, the risk of simultaneous failure of both can be reduced, so that the current detection current is more accurate, which is beneficial to improving the accuracy of detection results.
  • the first current sensor and the second current sensor are respectively powered by two independent power supply units, so as to avoid simultaneous failure of the two current sensors due to power supply. That is, through the above method, the first current and the second current are respectively collected through two independent collection paths without affecting each other, so that the current detection current is more accurate, which is beneficial to improving the accuracy of detection results.
  • the first current sensor outputs a first signal, and the first signal undergoes analog-to-digital conversion processing by the first analog-to-digital converter to obtain the first current;
  • the second current sensor outputs a second signal, The second signal is subjected to analog-to-digital conversion processing by the second analog-to-digital converter to obtain the second current; wherein, the first analog-to-digital converter and the second analog-to-digital converter are independent of each other.
  • the first current is obtained by processing the first signal collected by the first current sensor by the first analog-to-digital converter
  • the second current is obtained by processing the first signal collected by the second current sensor by the second analog-to-digital converter.
  • the two signals are obtained, and the two analog-to-digital conversion paths are independent of each other, which can reduce the risk of sampling failure due to analog-to-digital conversion failure, make the current detection current more accurate, and help improve the accuracy of detection results.
  • the determination of the current threshold according to the current temperature and the charging and discharging state includes: according to the current temperature and the charging and discharging state, searching for the corresponding current threshold in the preset temperature threshold relationship table ;
  • the charge and discharge state includes charge state or discharge state
  • the temperature threshold relationship table includes the correspondence between temperature, charge state and current threshold, and the correspondence between temperature, discharge state and current threshold.
  • a temperature threshold relationship table is preset, and by setting the temperature threshold relationship table, it includes the correspondence between temperature, charge state and current threshold, and the correspondence between temperature, discharge state and current threshold , thus, after obtaining the current temperature and the charging and discharging state, the corresponding current threshold can be determined by looking up the temperature threshold relationship table.
  • the found current threshold is not only adapted to the current temperature, but also adapted to the current charging and discharging state, so that the found current threshold is more accurate and refined.
  • the above method of setting the temperature threshold relationship table and determining the current threshold by looking up the table not only makes the current threshold more reasonable and accurate. Also simple and convenient.
  • the preset condition includes that the number of times the current detected current exceeds the current threshold reaches the preset number of times, and if the current detected current exceeds the current threshold and meets the preset condition, it is determined that the battery has an overcurrent fault , including: if the preset number of times is one, then the current detection current exceeds the current threshold, and it is determined that the battery has an overcurrent fault; or, if the preset number of times is multiple, when the above-mentioned current detection current exceeds the current threshold, a new first A current and a new second current, and according to the detection current determination strategy, determine a new current detection current from the new first current and the new second current; and when the new current detection current exceeds the current threshold, accumulate the corresponding times, until the current detected current exceeds the current threshold for a preset number of times, it is determined that the battery has an overcurrent fault.
  • the preset number of times is set once
  • the preset number of times is multiple times.
  • the current detection current is updated multiple times and compared with the current Detect whether the current exceeds the current threshold, and accumulate the corresponding times until the current detection current exceeds the current threshold for the preset number of times, it is determined that the battery has an overcurrent fault, that is, after multiple detections of the results of the overcurrent fault, it is finally determined that the overcurrent has occurred Faults can prevent false positives and make the final detection results more accurate.
  • the present application provides a battery overcurrent detection device, including: a current acquisition module, used to acquire the first current of the negative pole of the battery and the second current of the positive pole of the battery; Determine the strategy, determine the current detection current from the first current and the second current; the state acquisition module is used to obtain the charge and discharge state of the battery; the temperature acquisition module is used to obtain the current temperature of the battery; The temperature and the charge and discharge state determine the current threshold; the fault determination module is used to determine that the battery has an overcurrent fault if the current detected current exceeds the current threshold and meets the preset conditions.
  • a current acquisition module used to acquire the first current of the negative pole of the battery and the second current of the positive pole of the battery
  • Determine the strategy determine the current detection current from the first current and the second current
  • the state acquisition module is used to obtain the charge and discharge state of the battery
  • the temperature acquisition module is used to obtain the current temperature of the battery
  • the temperature and the charge and discharge state determine the current threshold
  • the fault determination module is used to determine that the battery has an
  • the current detection current determination module determines the current detection current from the first current of the negative pole of the battery and the second current of the positive pole of the battery based on the preset detection current determination strategy, which can ensure the accuracy of the current detection current Compared with directly using the first current or the second current, it can effectively prevent the current detection current from being inaccurate due to the acquisition error of the first current or the second current.
  • the current threshold is determined by the threshold determination module according to the charging and discharging state of the battery and the current temperature, that is, the influence of the charging and discharging state and the current temperature on the current threshold is taken into account, for example, the current threshold required at high temperature and low temperature is different, the charging state and The current threshold required in the discharge state is different, so that the current threshold matches the charge and discharge state and the current temperature, making it more refined.
  • the fault determination module compares the current detection current with the current threshold, if the current detection current exceeds the current threshold and meets the preset condition, it is determined that the battery has an overcurrent fault, so that the detection result is accurate. That is, by ensuring that the current detection current is accurate, setting an accurate and reasonable current threshold, and setting preset conditions during the comparison process, the overcurrent detection is more accurate and reliable, and false alarms are effectively reduced, so that the battery overcurrent fault can be accurately detected .
  • the present application provides a battery management system, including: a first current sensor, used to collect the first current of the negative electrode of the battery; a second current sensor, used to collect the second current of the positive electrode of the battery; a temperature sensor, used to For collecting the current temperature of the battery; the processor, the processor is respectively connected with the first current sensor, the second current sensor and the temperature sensor in communication, so as to obtain the first current, the second current and the current temperature; the memory, the memory and the processor The communication connection, the memory stores instructions that can be executed by the processor, and the instructions are executed by the processor, so that the processor can execute the battery overcurrent detection method of the first aspect.
  • the battery management system can realize an accurate and reliable overcurrent detection function.
  • the present application provides a battery, including the battery management system in the third aspect.
  • the battery has accurate and reliable over-current detection and over-current protection functions, which is safer and more reliable.
  • Figure 1 is a schematic structural view of a battery in some embodiments of the present application.
  • Fig. 2 is a schematic diagram of the connection of the switch circuit in some embodiments of the present application.
  • FIG. 3 is a schematic flowchart of a battery overcurrent detection method in some embodiments of the present application.
  • Fig. 4 is a schematic diagram of a sub-flow process of step S20 in the method shown in Fig. 3;
  • Fig. 5 is a schematic diagram of a sub-flow process of step S21 in the method shown in Fig. 4;
  • Fig. 6 is a schematic diagram of a sub-flow process of step S22 in the method shown in Fig. 4;
  • Fig. 7 is a schematic diagram of a sub-flow process of step S23 in the method shown in Fig. 4;
  • Fig. 8 is a schematic diagram of a sub-flow process of step S40 in the method shown in Fig. 3;
  • Fig. 9 is a schematic diagram of a sub-flow process of step S50 in the method shown in Fig. 3;
  • FIG. 10 is a schematic diagram of a battery overcurrent detection device in some embodiments of the present application.
  • Fig. 11 is a schematic structural diagram of a battery management system in some embodiments of the present application.
  • multiple refers to more than two (including two), similarly, “multiple groups” refers to more than two groups (including two), and “multiple pieces” refers to More than two pieces (including two pieces).
  • a battery management system (BATTERY MANAGEMENT SYSTEM, BMS) is designed as a battery protection and management unit.
  • a battery 100 includes a battery body 10 and a battery management system 20 , and the battery body 10 may be a cell or one or more cell modules.
  • the battery management system 20 includes a voltage sampling module 21 , a current sampling module 22 , a temperature sensor 23 , a controller 24 , a switch circuit 25 and the like.
  • the voltage sampling module 21 is used to collect the voltage of the battery body 10 in real time, passive equalization power, etc.
  • the current sampling module 22 is used to sample the current of the battery body 10 in the process of charging and discharging
  • the temperature sensor 23 is used to collect the current of the battery body 10 in real time. 10 temperature.
  • the voltage sampling module 21 and the current sampling module 22 transmit the collected data to the controller 24 (MCU), and the controller 24 determines the required undervoltage, overvoltage, overcurrent, short circuit, overtemperature and temperature of the battery 100 according to the collected data.
  • MCU controller 24
  • the control switch circuit 25 selectively disconnects or connects the connection between the battery 100 and the external device 30 (load or charger), so as to implement the determined protective measures .
  • the voltage sampling module 21 and the current sampling module 22 can be implemented by an existing chip module (such as an integrated circuit IC) or a conventional circuit in the field, and the details of the voltage sampling module 21 and the current sampling module 22 will not be described here. Circuit configuration.
  • the temperature sensor 23 can be implemented by an existing thermal resistance or thermocouple, and the structure and principle of the temperature sensor 23 will not be described in detail here.
  • the switch circuit 25 can be implemented by existing MOS transistors and fuses.
  • the switch circuit 25 includes two MOS transistors 251 and a fuse 252, the two MOS transistors 251 are connected in series with the fuse 252, and the control terminals of the two MOS transistors 251 are connected to the controller 24 respectively. connect. Then, the switch circuit 25 connects the battery body 10 and the external device 30 (load or charger), which is equivalent to connecting the switch circuit 25 and the external device 30 in series. It can be understood that the MOS transistor 251 can be turned on and off under the action of the driving voltage applied by the controller 24 within the current threshold range or the voltage threshold range.
  • the control MOS tube 251 is disconnected so that the battery 100 is connected to the external
  • the device 30 load or charger is disconnected to prevent the battery 100 from being ignited due to over-current, over-voltage or over-temperature.
  • the MOS transistor 251 is triggered to disconnect the battery 100 from the external device 30 (charging device or power supply device). It can be understood that the accuracy of detecting current and the accuracy and rationality of the current threshold directly affect the accuracy of overcurrent fault detection.
  • the inventors of the present application have found through research that the accuracy of the detection current can be improved, so that the detection current is effective and reasonable, and can accurately reflect the current in the current circuit of the battery.
  • the use accuracy is high
  • a current sensor is used to collect the detection current, or a plurality of current sensors are used to collect the current, and the final detection current is determined from the plurality of currents.
  • the precise rationality of the current threshold can also be optimized to make the current threshold more reasonable in the state of the battery, for example, considering the influence of the charge and discharge state of the battery or the temperature of the battery on the current threshold.
  • the first current of the negative electrode of the battery and the second current of the positive electrode of the battery are obtained, and the current detected current is determined from the first current and the second current according to the detection current determination strategy. That is, collect the first current and the second current from the positive pole and the negative pole of the battery respectively, and determine the current detection current from the first current and the second current according to the preset detection current determination strategy, which can reduce the current inaccuracy caused by collection failures Compared with directly using the first current or the second current, it can effectively prevent the current detection current from being inaccurate due to the acquisition error of the first current or the second current.
  • the current threshold is determined according to the charging and discharging state of the battery and the current temperature, that is, the influence of the charging and discharging state and the current temperature on the current threshold is taken into account.
  • the required current thresholds are different, so that the current threshold matches the charging and discharging state and the current temperature, which is more refined.
  • the overcurrent detection is more accurate and reliable, and false alarms are effectively reduced, so that the battery overcurrent fault can be accurately detected .
  • the batteries disclosed in the embodiments of the present application can be used, but not limited to, in electric devices such as vehicles, ships or aircrafts.
  • the power system composed of the battery disclosed in this application can be used to form the power device. In this way, based on the accurate and reliable overcurrent detection and overcurrent protection functions of the battery, the power device and power system are safer and more reliable.
  • the embodiment of the present application provides an electric device using a battery as a power source.
  • the electric device can be, but not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like.
  • electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric boat toys, electric airplane toys, etc.
  • spacecraft may include airplanes, rockets, space shuttles, spaceships, etc.
  • FIG. 3 is a schematic flowchart of a battery overcurrent detection method provided in an embodiment of the present application.
  • the method S100 may specifically include the following steps:
  • the first current is the current collected from the negative pole of the battery.
  • the sensor A collects the current signal A at the negative pole of the battery, and the current signal A obtains the first current after being processed by analog-to-digital conversion;
  • the sensor B collects the current signal B at the positive pole of the battery, and the current signal B obtains the first current after undergoing analog-to-digital conversion processing.
  • Two currents It can be understood that the first current and the second current are currents collected at different locations in the same loop, and theoretically, the difference between the first current and the second current should be small or consistent.
  • S20 Determine the current detection current from the first current and the second current according to the detection current determination strategy.
  • the detection current determination strategy is used to guide the determination of the current detection current from the first current and the second current. It can be understood that if the first current (or the second current) is directly used as the current detection current, in the case of failure in the collection of the first current (or the second current), the error of the first current (or the second current) Larger, making the current detection current inaccurate.
  • the current detection current is determined from the first current of the battery negative pole and the second current of the battery positive pole, which can ensure the accuracy of the current detection current, compared to directly using the first current or the second current , which can effectively prevent the current detected current from being inaccurate due to the acquisition error of the first current or the second current.
  • the charging and discharging state of the battery includes a charging state or a discharging state.
  • the battery When the battery is connected to the charger, the battery is in the charging state, and when the battery is connected to the load, the battery is in the discharging state.
  • the current direction of the battery in the charge state and discharge state is opposite, and the controller in the battery management system can analyze the charge and discharge state according to the current direction.
  • the current temperature of the battery is usually detected by a temperature sensor.
  • the temperature sensor can be attached to the surface of the cell module in the battery to collect the temperature signal, and then convert the temperature signal into the current temperature. It can be understood that the temperature sensor collects temperature signals in real time to obtain the current temperature.
  • S40 Determine the current threshold according to the current temperature and the charging and discharging state.
  • the current threshold is a current threshold used for comparison with the current detection current, and if the current detection current exceeds the current threshold, it can be determined that an overcurrent fault occurs.
  • the current threshold is determined according to the charging and discharging state of the battery and the current temperature, which takes into account the influence of the charging and discharging state and the current temperature on the current threshold.
  • the current threshold is different, so that the current threshold matches the charge and discharge state and the current temperature, which is more refined.
  • the current detection current is compared with the current threshold, if the current detection current exceeds the current threshold and meets the preset condition, it is determined that the battery has an overcurrent fault, so that the detection result is accurate.
  • the preset condition is used to limit the current detection current exceeding the current threshold. To make the detection result more cautious and accurate, for example, the value of the current detection current exceeding the current threshold can reach a certain percentage.
  • the current detection current is determined from the first current of the negative pole of the battery and the second current of the positive pole of the battery, which can ensure the accuracy of the current detection current.
  • the current threshold is determined according to the charge and discharge state of the battery and the current temperature, that is, the influence of the charge and discharge state and the current temperature on the current threshold is taken into account, for example, the current threshold required at high temperature and low temperature is different, and the state of charge and discharge are different.
  • the required current thresholds are different, so that the current threshold matches the charging and discharging state and the current temperature, which is more refined.
  • the current detection current is compared with the current threshold, if the current detection current exceeds the current threshold and meets the preset condition, it is determined that the battery has an overcurrent fault, so that the detection result is accurate. That is, by ensuring that the current detection current is accurate, setting an accurate and reasonable current threshold, and setting preset conditions during the comparison process, the overcurrent detection is more accurate and reliable, and false alarms are effectively reduced, so that the battery overcurrent fault can be accurately detected .
  • step S20 specifically includes:
  • Validity verification can be understood as verifying whether a fault occurs in the current collection process, and confirming that the current collection process is normal. For example, if the first current is much smaller than the detection range of the sensor, or is much larger than the detection range of the sensor, it means that the collection process of the first current fails, and the first current is invalid.
  • the first current and the second current are currents collected at different locations in the same loop, and theoretically, the difference between the first current and the second current should be small or consistent. Therefore, the rationality check can be understood as verifying whether the first current and the second current are currents of the same loop. It can be understood that if the difference between the first current and the second current is abnormally large, it is obvious that the first current and the second current are unreasonable.
  • the validity check and the rationality check are respectively performed on the collected first current and the second current to obtain the validity and rationality of the first current and the validity and rationality of the second current, Then, the current detection current is determined accordingly, that is, the current detection current is determined after considering the validity and rationality of the first current and the validity and rationality of the second current, which is more accurate and beneficial to improve the accuracy of overcurrent detection sex.
  • step S21 specifically includes:
  • the first preset measurement range is the measurement range of the first current sensor for measuring the first current
  • the second preset measurement range is the measurement range of the second current sensor for measuring the second current
  • the first preset zero-drift threshold is a threshold reflecting the zero-point drift of the first current sensor.
  • the second preset zero-drift threshold is a threshold reflecting the zero-point drift of the second current sensor. Zero drift means that when the amplifier circuit has no input signal, if the output terminal is measured with a sensitive DC meter, there will be a slow output voltage, that is, the baseline of the waveform of the current signal and the zero line deviate.
  • the first current is within the first preset measurement range, it means that the first current sensor is normal. If the zero drift value of the first current is less than or equal to the first preset zero drift threshold, it means that the first current sensor is in a stable state. Therefore, in When both conditions are met, the first current is valid.
  • the second current is within the second preset measurement range, it means that the second current sensor is normal. If the zero drift value of the second current is less than or equal to the second preset zero drift threshold, it means that the second current sensor is in a stable state. Therefore, in When both conditions are met, the second current is valid. It can be understood that the stability of the state can be the stability of the temperature and the input voltage, and the interference is small.
  • the validity of the first current can be detected by combining the measurement range of the first current sensor and the first preset zero-drift threshold to accurately determine the validity of the first current. If the first current is valid, the first current is within the first preset measurement range and its zero drift value is reasonable, indicating that the first current sensor is normal, and the first current is acquired when the state of the first current sensor is stable, Receive less disturbance.
  • the validity of the second current can be accurately determined. If the second current is valid, the second current is within the second preset measurement range and its zero drift value is reasonable, indicating that the second current sensor is normal, and the second current is obtained when the state of the second current sensor is stable, Receive less disturbance.
  • step S22 specifically includes:
  • the preset deviation range is used as the basis for judgment. It can be understood that the preset deviation range is a current range, which can be determined by those skilled in the art according to the accuracy of the two current sensors and actual test conditions.
  • the first current and the second current are the currents of the same circuit in the same state, and are detected by different sensors.
  • the first current and the second current should be the same or similar. Therefore, by comparing the first current Whether the difference between the first current and the second current is within the preset deviation range can determine the rationality of the first current and the second current, and ensure that the collected first current and the second current are the same loop in the same state Current, so as not to cause the current detection current determined according to the first current and the second current to be inaccurate due to the acquisition delay of the first current or the second current, and affect the final detection result.
  • step S23 specifically includes:
  • the inventors of the present application have found in historical experiments that the current sensor at the negative pole has higher accuracy. Therefore, when both the first current and the second current are effective and reasonable, it is more convenient to select the first current at the negative pole as the current detection current. accurate.
  • the historical experiment includes collecting multiple sets of effective and reasonable first current and second current, respectively using the first current as the current detection current and the second current as the current detection current to perform over-current detection, and counting the two cases The accuracy rate of the detection result, it is found that the accuracy rate of the detection result is higher when the first current is used as the current detection current.
  • S234 If both the first current and the second current are invalid, and the first current is greater than or equal to the upper limit of the first preset measurement range, and the second current is greater than or equal to the upper limit of the second preset measurement range, then determine that the current detection current is The larger of the first current and the second current.
  • both the first current and the second current are invalid and the first current exceeds the upper limit of the measurement range of the first current sensor, and the second current exceeds the upper limit of the measurement range of the second current sensor, that is, both the first current and the second current exceed the limit
  • the smaller of the two is selected as the current detection current and compared with the current detection threshold, misjudgment is likely to occur.
  • choosing the larger of the two as the current detection current makes the detection result more cautious and more accurate.
  • both the first current and the second current are invalid and neither the first current nor the second current has an overrun error
  • the first current is less than the lower limit of the measurement range of the first current sensor
  • the second current is less than the lower limit of the measurement range of the second current sensor.
  • the lower limit of the measurement range is invalid. If any one of them is selected as the current detection current, the error will be large. Therefore, it is determined that the current detection current is the detection current of the previous detection cycle, so that the detection result is more cautious and the accuracy is higher.
  • both the first current and the second current when both the first current and the second current are effective and reasonable, it is found through historical experimental data that it is more accurate to select the first current at the negative pole as the current detection current.
  • both the first current and the second current are effective and unreasonable, the larger of the two is selected as the current detection current, so that the detection result is more cautious and the accuracy is higher.
  • one of the first current and the second current is valid and the other is invalid, it is more appropriate to determine that the currently detected current is a valid current.
  • both the first current and the second current are invalid and the first current exceeds the upper limit of the measurement range of the first current sensor, and the second current exceeds the upper limit of the measurement range of the second current sensor, that is, both the first current and the second current exceed the limit
  • the current detection current is the larger value of the first current and the second current, so that the detection result is more cautious and the accuracy is higher.
  • the current detection current is the detection current of the previous detection cycle, so that the detection result is more cautious and more accurate. high.
  • the working principles of the first current sensor and the second current sensor are different, the first current sensor is powered by the first power supply unit, the second current sensor is powered by the second power supply unit, and the first current sensor is powered by the second power supply unit.
  • the power supply unit and the second power supply unit are independent of each other.
  • the first current sensor and the second current sensor are of different types and have different working principles.
  • the first current sensor may be an existing Hall current sensor
  • the second current sensor may be an existing Rogowski coil current sensor.
  • the two current sensors with different working principles collect current separately, which can avoid the failure of the two current sensors due to the same cause, that is, avoid the common cause failure of the two current sensors.
  • the first current sensor and the second current sensor are connected to the battery, if the voltage of the battery is unstable, it is easy to cause a large zero drift in the first current and the second current, which will affect the accuracy of the current detection current.
  • the first current sensor is powered by the first power supply unit (such as battery 1#)
  • the second current sensor is powered by the second power supply unit (such as battery 2#), which can be beneficial to increase the accuracy of the current detection current, and avoid Two current sensors fail at the same time due to power supply.
  • the first current sensor and the second current sensor have different working principles, they are equivalent to two current sensors of different types, which can prevent the failure of the two current sensors due to the same reason, that is, avoid the common failure of the two current sensors. due to failure.
  • the working principles of the first current sensor and the second current sensor are different, the risk of simultaneous failure of both can be reduced, so that the current detection current is more accurate, which is beneficial to improving the accuracy of detection results.
  • the first current sensor and the second current sensor are respectively powered by two independent power supply units, so as to avoid simultaneous failure of the two current sensors due to power supply. That is, through the above method, the first current and the second current are respectively collected through two independent collection paths without affecting each other, so that the current detection current is more accurate, which is beneficial to improving the accuracy of detection results.
  • the first current sensor outputs a first signal, and the first signal is subjected to analog-to-digital conversion processing by the first analog-to-digital converter to obtain the first current.
  • the second current sensor outputs a second signal, and the second signal undergoes analog-to-digital conversion processing by the second analog-to-digital converter to obtain a second current.
  • the first analog-to-digital converter and the second analog-to-digital converter are independent of each other.
  • the first analog-to-digital converter performs analog-to-digital conversion processing on the first signal to obtain the first current.
  • the type of the first current sensor determines the first signal, and the first signal may be a current signal or a voltage signal.
  • the second analog-to-digital converter performs analog-to-digital conversion processing on the second signal to obtain the second current.
  • the type of the second current sensor determines the second signal, and the second signal may be a current signal or a voltage signal.
  • the first analog-to-digital converter and the second analog-to-digital converter are independent of each other.
  • the first analog-to-digital converter may be an ADC. It can be understood that before sampling, the ADC analog-to-digital converter can be checked, for example, collecting a preset voltage signal (such as a 2.5V voltage signal), and converting it through the ADC analog-to-digital converter, if the converted If the voltage is approximately 2.5V, it can be determined that the ADC analog-to-digital converter is normal.
  • a preset voltage signal such as a 2.5V voltage signal
  • the second analog-to-digital converter may be another ADC analog-to-digital converter, or a voltage detector model AME8550. Before the acquisition, the second analog-to-digital converter may also be verified, and the specific verification method can be designed by those skilled in the art, and will not be repeated here.
  • the first current is obtained by processing the first signal collected by the first current sensor by the first analog-to-digital converter
  • the second current is obtained by processing the second signal collected by the second current sensor by the second analog-to-digital converter
  • step S40 specifically includes:
  • the charging and discharging state includes a charging state or a discharging state, for example, when the battery is connected to a charger, it is in a charging state, and when it is connected to a load, it is in a discharging state.
  • the temperature threshold relationship table includes the correspondence between temperature, charge state and current threshold, and the correspondence between temperature, discharge state and current threshold, so that when the current temperature and charge and discharge state are obtained, the temperature threshold relationship is searched Table, the corresponding current threshold can be determined.
  • the temperature threshold relationship table may be as shown in Table 1 below:
  • the fault tolerance time interval in Table 1 means that when an overcurrent fault occurs, the battery must be cut off for protection within the fault tolerance time interval, that is, the connection between the battery and the external device must be cut off.
  • the temperature threshold relationship table is preset, and the temperature threshold relationship table includes the correspondence between temperature, charge state and current threshold, and the correspondence between temperature, discharge state and current threshold, so that , after obtaining the current temperature and charging and discharging state, look up the temperature threshold relationship table to determine the corresponding current threshold.
  • the found current threshold is not only adapted to the current temperature, but also adapted to the current charging and discharging state, so that the found current threshold is more accurate and refined.
  • the above method of setting the temperature threshold relationship table and determining the current threshold by looking up the table not only makes the current threshold more reasonable and accurate. Also simple and convenient.
  • the preset condition includes that the number of times the current detected current exceeds the current threshold reaches a preset number of times.
  • the preset number of times can be 1 time, 2 times, 3 times, etc., which can be set according to actual conditions.
  • step S50 specifically includes:
  • the new first current and second current will be reacquired for the second detection, for example, the original first signal and the first signal
  • the second signal is re-analog-to-digital converted
  • a new first current and a second current are obtained, and a new current detection current is determined from the new first current and the new second current; and when the new current detection current exceeds the current threshold , the new first current and second current are reacquired for the third and fourth detections, etc., until it is detected that the new current detection current exceeds the current threshold for 3 times, and it is determined that the battery has an overcurrent fault.
  • the corresponding times are accumulated until the current detection current exceeds the current threshold for a preset number of times, and it is determined that the battery has an overcurrent fault, that is, multiple After the result of the over-current fault is detected for the first time, it is finally determined that the over-current fault has occurred, which can prevent false alarms and make the final detection result more accurate.
  • a current overcurrent detection method including:
  • the independent path corresponding to the first current includes a first current sensor, a first analog-to-digital converter, and a first power supply unit for supplying power to the first current sensor.
  • the independent path corresponding to the second current includes a second current sensor, a second analog-to-digital converter, and a second power supply unit for powering the second current sensor.
  • the other errors in Table 2 are non-overrunning errors. Combined with the detection current determination strategy in Table 2, the validity and rationality of the first current and the second current are checked, and the current current is determined according to the validity and rationality check results.
  • the detection current makes the current detection current accurate, the detection result is more cautious, and the accuracy is higher.
  • the temperature-threshold relationship table includes the corresponding relationship between temperature, charging state and current threshold, and the corresponding relationship between temperature, discharging state and current threshold.
  • the threshold relationship table can determine the corresponding current threshold.
  • the found current threshold is not only adapted to the current temperature, but also adapted to the current charging and discharging state, so that the found current threshold is more accurate and refined. Compared with setting a relatively rough current threshold regardless of whether it is at high temperature or low temperature, or whether it is in the charging state or the discharging state, the above method of setting the temperature threshold relationship table and determining the current threshold by looking up the table not only makes the current threshold more reasonable and accurate. Also simple and convenient.
  • the present application also provides a battery overcurrent detection device 300, including: a current acquisition module 301, a current detection current determination module 302, a state acquisition module 303, and a temperature acquisition module 304 , a threshold determination module 305 and a fault determination module 306.
  • the current acquiring module 301 is configured to acquire the first current of the negative pole of the battery and the second current of the positive pole of the battery.
  • the current detection current determination module 302 is configured to determine the current detection current from the first current and the second current according to the detection current determination strategy.
  • the state acquisition module 303 is configured to acquire the charge and discharge state of the battery.
  • the temperature acquisition module 304 is configured to acquire the current temperature of the battery.
  • the threshold determination module 305 is configured to determine the current threshold according to the current temperature and the state of charging and discharging.
  • the fault determination module 306 is configured to determine that the battery has an over-current fault if the current detected current exceeds the current threshold and satisfies a preset condition.
  • the current detection current determination module 302 determines the current detection current from the first current of the negative pole of the battery and the second current of the positive pole of the battery based on the preset detection current determination strategy, which can ensure the accuracy of the current detection current, Compared with directly using the first current or the second current, it can effectively prevent the currently detected current from being inaccurate due to the acquisition error of the first current or the second current.
  • the current threshold is determined by the threshold determination module according to the charging and discharging state of the battery and the current temperature, that is, the influence of the charging and discharging state and the current temperature on the current threshold is taken into account, for example, the current threshold required at high temperature and low temperature is different, the charging state and The current threshold required in the discharge state is different, so that the current threshold matches the charge and discharge state and the current temperature, making it more refined.
  • the fault determination module 306 compares the current detected current with the current threshold, if the current detected current exceeds the current threshold and meets the preset condition, it is determined that the battery has an overcurrent fault, so that the detection result is accurate. That is, by ensuring that the current detection current is accurate, setting an accurate and reasonable current threshold, and setting preset conditions during the comparison process, the overcurrent detection is more accurate and reliable, and false alarms are effectively reduced, so that the battery overcurrent fault can be accurately detected .
  • the present application also provides a battery management system 400 including: a first current sensor 401 , a second current sensor 402 , a temperature sensor 403 , a processor 404 and a memory 405 .
  • the first current sensor 401 is connected to the negative pole of the battery for collecting the first current of the negative pole of the battery
  • the second current sensor 402 is connected to the positive pole of the battery for collecting the second current of the positive pole of the battery.
  • the temperature sensor 403 can be attached to the surface of the cell module in the battery to collect the current temperature of the battery.
  • the processor 404 is respectively connected in communication with the first current sensor 401 , the second current sensor 402 and the temperature sensor 403 to acquire the first current, the second current and the current temperature.
  • the memory 405 is connected in communication with the processor 404, and the memory 405 stores instructions executable by the processor 404, and the instructions are executed by the processor 404, so that the processor 404 can execute the battery overcurrent detection method of the first aspect.
  • the memory 405 may include a read-only memory and a random access memory, and provides instructions and data to the processor 404 .
  • a part of the memory 405 may also include a non-volatile random access memory (non-volatile random accedd memory, NVRAM).
  • NVRAM non-volatile random accedd memory
  • the memory 405 stores operating instructions, executable modules or data structures, or a subset thereof, or an extended set thereof.
  • the processor 404 may be an integrated circuit chip and has a signal processing capability. In the implementation process, each step of the above current overcurrent detection method may be completed by an integrated logic circuit of hardware in the processor 404 or instructions in the form of software.
  • the above-mentioned processor 404 can be a general-purpose processor, a digital signal processor (digital signal processing, DSP), a microprocessor or a microcontroller, and can further include an application-specific integrated circuit (application specific integrated circuit, ASIC), field programmable Field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.
  • the processor can implement or execute the aforementioned battery overcurrent detection method.
  • the battery management system 400 can realize an accurate and reliable overcurrent detection function.
  • the present application also provides a battery, including the foregoing battery management system.
  • the battery has accurate and reliable over-current detection and over-current protection functions, which is safer and more reliable.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Secondary Cells (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

本申请实施例涉及电池技术领域，特别是涉及一种电池过流检测方法、电池管理系统及电池，基于预先设置的检测电流确定策略，确定当前检测电流，能够确保当前检测电流的准确性。其次，电流阈值是根据电池的充放电状态和当前温度确定的，即考虑到了充放电状态和当前温度对电流阈值的影响，使得电流阈值与充放电状态和当前温度相匹配，更加精细化。最后，在将当前检测电流与电流阈值进行比较时，当前检测电流超过电流阈值满足预设条件，确定电池发生过流故障，使得检测结果准确。也即，通过确保当前检测电流准确、设置准确合理的电流阈值以及在比较过程中设置预设条件，使得过流检测更加准确可靠，有效减少误报，从而，能准确检测出电池的过流故障。

Description

一种电池过流检测方法、电池管理系统及电池 技术领域
本申请实施例涉及电池技术领域，特别是涉及一种电池过流检测方法、电池管理系统及电池。
背景技术
随着绿色能源的发展，电池的应用越来越广泛，尤其是在近年来兴起的新能源汽车领域、信息家电领域或光伏发电领域，电池都作为重要的储能供电设备，例如，为新能源汽车或终端设备等供电，为太阳能板储能。
电池由带有极高活性的化学材料通过复杂的工艺制造而成，在电池的充放电使用过程中，容易出现过流、过充电压或过热等问题。电池管理系统(BATTERY MANAGEMENT SYSTEM,BMS)是专门针对电池而设计的保护和管理单元。具体地，电池管理系统对电池进行充放电管理，在电池发生故障时(例如过流故障等)，对电池进行切断保护。当电池的电流大于设定阈值时，确定发生过流故障，触发断开电池与外部设备(充电设备或供电设备)的连接。可以理解的是，过流检测是确定过流故障的前提，因此，对过流检测的准确性要求较高，其直接影响过流故障的判断。
发明内容
鉴于上述问题，本申请提供一种电池过流检测方法、电池管理系统及电池，能准确检测出电池的过流故障。
第一方面，本申请提供了一种电池过流检测方法，包括：获取电池负极的第一电流以及电池正极的第二电流，根据检测电流确定策略，从第一电流及第二电流中确定当前检测电流，获取该电池的充放电状态和该电池的当前温度，根据当前温度和充放电状态，确定电流阈值，若当 前检测电流超过电流阈值满足预设条件，则确定电池发生过流故障。
在本申请的上述实施方式中，首先，基于预先设置的检测电流确定策略，从电池负极的第一电流和电池正极的第二电流中确定当前检测电流，能够确保当前检测电流的准确性，相比于直接使用第一电流或第二电流，可以有效防止因第一电流或第二电流的采集误差使得当前检测电流不准确。其次，电流阈值是根据电池的充放电状态和当前温度确定的，即考虑到了充放电状态和当前温度对电流阈值的影响，例如高温和低温下所需要的电流阈值不同，充电状态和放电状态下所需要的电流阈值不同，使得电流阈值与充放电状态和当前温度相匹配，更加精细化。最后，在将当前检测电流与电流阈值进行比较时，当前检测电流超过电流阈值满足预设条件，确定电池发生过流故障，使得检测结果准确。也即，通过确保当前检测电流准确、设置准确合理的电流阈值以及在比较过程中设置预设条件，使得过流检测更加准确可靠，有效减少误报，从而，能准确检测出电池的过流故障。
在第一方面的一种可能实现方式中，前述根据检测电流确定策略，从第一电流及第二电流中确定当前检测电流，包括：分别对第一电流和第二电流进行有效性校验，对第一电流和第二电流进行合理性校验，根据有效性校验的结果和合理性校验的结果，确定当前检测电流。
在本申请上述实施方式中，对采集到的第一电流和第二电流分别进行有效性校验和合理性校验，获取第一电流的有效性和合理性以及第二电流的有效性和合理性，然后，据此确定当前检测电流，即当前检测电流是在考虑第一电流的有效性和合理性以及第二电流的有效性和合理性后确定的，更加准确，有益于提高过流检测的准确性。
在第一方面的一种可能实现方式中，前述分别对第一电流和第二电流进行有效性校验，包括：若第一电流在第一预设测量范围内，且第一电流的零漂值小于或等于第一预设零漂阈值，则确定第一电流有效；或，若第二电流在第二预设测量范围内，且第二电流的零漂值小于或等于第二预设零漂阈值，则确定第二电流有效；其中，第一预设测量范围为用于测量第一电流的第一电流传感器的测量范围，第二预设测量范围为用 于测量第二电流的第二电流传感器的测量范围。
在本申请上述实施方式中，结合第一电流传感器的测量范围和第一预设零漂阈值，检测第一电流的有效性，能准确确定第一电流的有效性。若第一电流有效，则第一电流在第一预设测量范围内且其零漂值合理，说明第一电流传感器正常，且第一电流是在第一电流传感器状态稳定的情况下获取的，受到的干扰较小。
同理，结合第二电流传感器的测量范围和第二预设零漂阈值，检测第二电流的有效性，能准确确定第二电流的有效性。若第二电流有效，则第二电流在第二预设测量范围内且其零漂值合理，说明第二电流传感器正常，且第二电流是在第二电流传感器状态稳定的情况下获取的，受到的干扰较小。
在第一方面的一种可能实现方式中，前述对第一电流和第二电流进行合理性校验，包括：若第一电流和第二电流之间的差值在预设偏差范围内，则确定第一电流和第二电流合理；或，若第一电流和第二电流之间的差值不在预设偏差范围内，则确定第一电流和第二电流不合理。
在本申请上述实施方式中，第一电流和第二电流是同一回路在同一状态下的电流，由不同的传感器检测，理论上第一电流和第二电流应该相同或相近，从而，通过比较第一电流和第二电流之间的差值是否在预设偏差范围内，即可确定第一电流和第二电流的合理性，确保采集到的第一电流和第二电流是同一回路在同一状态下的电流，以免因第一电流或第二电流的采集延迟，而导致根据第一电流和第二电流确定的当前检测电流不准确，影响最终的检测结果。
在第一方面的一种可能实现方式中，前述根据有效性校验的结果和合理性校验的结果，确定当前检测电流，包括：若第一电流和第二电流均有效，且第一电流和第二电流合理，则确定所述当前检测电流为第一电流；或，若第一电流和第二电流均有效，且第一电流和第二电流不合理，则确定当前检测电流为第一电流和第二电流中的较大值；或，若第一电流和第二电流中的一个有效，另一个无效，则确定当前检测电流为有效的电流；或，若第一电流和第二电流均无效，且第一电流大于或等 于第一预设测量范围的上限、第二电流大于或等于第二预设测量范围的上限，则确定当前检测电流为第一电流和第二电流中的较大值；或，若第一电流和第二电流均无效，且第一电流小于第一预设测量范围的上限和/或第二电流小于第二预设测量范围的上限，则确定当前检测电流为上一检测周期的检测电流。
在本申请上述实施方式中，在第一电流和第二电流均有效且合理的情况下，经过历史实验数据发现，选择负极处的第一电流作为当前检测电流更加精确。在第一电流和第二电流均有效且不合理的情况下，选择两者中较大的作为当前检测电流，使得检测结果更加谨慎，准确度更高。在第一电流和第二电流中一个有效、另一个无效的情况下，确定当前检测电流为有效的电流，比较合适。在第一电流和第二电流均无效且第一电流超过第一电流传感器的测量范围上限、第二电流超过第二电流传感器的测量方位上限时，即第一电流和第二电流均出现超限错误的情况下，确定当前检测电流为第一电流和第二电流中的较大值，使得检测结果更加谨慎，准确度更高。在第一电流和第二电流均无效且第一电流和第二电流均未出现超限错误的情况下，确定当前检测电流为上一检测周期的检测电流，使得检测结果更加谨慎，准确度更高。
在第一方面的一种可能实现方式中，第一电流传感器和第二电流传感器的工作原理不同，第一电流传感器由第一供电单元供电，第二电流传感器由第二供电单元供电，第一供电单元和第二供电单元相互独立。
在本申请上述实施方式中，基于第一电流传感器和第二电流传感器的工作原理不同，相当于类型不同的两个电流传感器，能够避免两个电流传感器因同一原因导致失效，即避免两个电流传感器共因失效。当第一电流传感器和第二电流传感器的工作原理不同时，能减少两者同时失效的风险，使得当前检测电流更加准确，有益于提高检测结果的准确性。此外，第一电流传感器和第二电流传感器分别由两个独立的供电单元供电，避免因供电原因导致两个电流传感器同时失效。也即，通过上述方式，使得第一电流和第二电流分别是通过两个独立的采集路径采集到的，互不影响，使得当前检测电流更加准确，有益于提高检测结果的准确性。
在第一方面的一种可能实现方式中，第一电流传感器输出第一信号，第一信号经第一模数转换器进行模数转换处理得到第一电流；第二电流传感器输出第二信号，第二信号经第二模数转换器进行模数转换处理得到第二电流；其中，第一模数转换器和第二模数转换器相互独立。
在本申请上述实施方式中，第一电流由第一模数转换器处理第一电流传感器采集到的第一信号得到，第二电流由第二模数转换器处理第二电流传感器采集到的第二信号得到，两个模数转换路径相互独立，能够减少因模数转换故障而导致采样失效的风险，使得当前检测电流更加准确，有益于提高检测结果的准确性。
在第一方面的一种可能实现方式中，前述根据当前温度和充放电状态，确定电流阈值，包括：根据当前温度和充放电状态，在预设的温度阈值关系表中，查找对应的电流阈值；其中，充放电状态包括充电状态或放电状态，温度阈值关系表包括温度、充电状态和电流阈值之间的对应关系，以及，温度、放电状态和电流阈值之间的对应关系。
在本申请上述实施方式中，预先设置有温度阈值关系表，通过设置温度阈值关系表包括温度、充电状态和电流阈值之间的对应关系，以及，温度、放电状态和电流阈值之间的对应关系，从而，当获取到当前温度和充放电状态后，查找温度阈值关系表，即可确定对应的电流阈值。基于查找到的电流阈值不仅与当前温度相适应，还与当前的充放电状态相适应，使得查找到的电流阈值更加准确、精细化。相比于无论在高温、低温或无论在充电状态、放电状态下均设置一个较为粗略的电流阈值，上述设置温度阈值关系表，并通过查表确定电流阈值的方式，不仅电流阈值更加合理准确，还简单方便。
在第一方面的一种可能实现方式中，前述预设条件包括当前检测电流超过电流阈值的次数达到预设次数，前述若当前检测电流超过电流阈值满足预设条件，则确定电池发生过流故障，包括：若预设次数为一次，则当前检测电流超过电流阈值，确定电池发生过流故障；或，若预设次数为多次，则当上述当前检测电流超过电流阈值时重新获取新的第一电流和新的第二电流，并根据检测电流确定策略，从新的第一电流和新的 第二电流中确定新的当前检测电流；并当新的当前检测电流超过电流阈值时，累计相应的次数，直至当前检测电流超过电流阈值达到预设次数时，确定电池发生过流故障。
在本申请上述实施方式中，除设置预设次数为一次这种情况外，还有预设次数为多次的情况，当预设次数为多次时，通过多次更新当前检测电流并比较当前检测电流是否超过电流阈值，累计相应的次数，直到当前检测电流超过电流阈值达到预设次数时，确定电池发生过流故障，即多次检测出过流故障的结果后，才最终确定发生过流故障，能够防止误报，使得最终的检测结果更加准确。
第二方面，本申请提供了一种电池过流检测装置，包括：电流获取模块，用于获取电池负极的第一电流以及电池正极的第二电流；当前检测电流确定模块，用于根据检测电流确定策略，从第一电流及第二电流中确定当前检测电流；状态获取模块，用于获取电池的充放电状态；温度获取模块，用于获取电池的当前温度；阈值确定模块，用于根据当前温度和充放电状态，确定电流阈值；故障确定模块，用于若当前检测电流超过电流阈值满足预设条件，则确定电池发生过流故障。
在本申请上述实施方式中，当前检测电流确定模块基于预先设置的检测电流确定策略，从电池负极的第一电流和电池正极的第二电流中确定当前检测电流，能够确保当前检测电流的准确性，相比于直接使用第一电流或第二电流，可以有效防止因第一电流或第二电流的采集误差使得当前检测电流不准确。其次，电流阈值是阈值确定模块根据电池的充放电状态和当前温度确定的，即考虑到了充放电状态和当前温度对电流阈值的影响，例如高温和低温下所需要的电流阈值不同，充电状态和放电状态下所需要的电流阈值不同，使得电流阈值与充放电状态和当前温度相匹配，更加精细化。最后，故障确定模块在将当前检测电流与电流阈值进行比较时，当前检测电流超过电流阈值满足预设条件，确定电池发生过流故障，使得检测结果准确。也即，通过确保当前检测电流准确、设置准确合理的电流阈值以及在比较过程中设置预设条件，使得过流检测更加准确可靠，有效减少误报，从而，能准确检测出电池的过流故障。
第三方面，本申请提供了一种电池管理系统，包括：第一电流传感器，用于采集电池负极的第一电流；第二电流传感器，用于采集电池正极的第二电流；温度传感器，用于采集电池的当前温度；处理器，该处理器分别与第一电流传感器、第二电流传感器和温度传感器通信连接，以获取第一电流、第二电流以及当前温度；存储器，该存储器与处理器通信连接，存储器存储有可被处理器执行的指令，该指令被处理器执行，以使处理器能够执行第一方面的电池过流检测方法。
在本申请上述实施方式中，电池管理系统能够实现准确可靠的过流检测功能。
第四方面，本申请提供了一种电池，包括第三方面的电池管理系统。
在本申请上述实施方式中，电池具有准确可靠的过流检测和过流保护功能，更加安全可靠。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
附图说明
通过阅读对下文优选实施方式的详细描述，各种其他的优点和益处对于本领域普通技术人员将变得清楚明了。附图仅用于示出优选实施方式的目的，而并不认为是对本申请的限制。而且在全部附图中，用相同的附图标号表示相同的部件。在附图中：
图1为本申请一些实施例中电池的结构示意图；
图2为本申请一些实施例中开关电路的连接示意图；
图3为本申请一些实施例中电池过流检测方法的流程示意图；
图4为图3所示方法中步骤S20的一子流程示意图；
图5为图4所示方法中步骤S21的一子流程示意图；
图6为图4所示方法中步骤S22的一子流程示意图；
图7为图4所示方法中步骤S23的一子流程示意图；
图8为图3所示方法中步骤S40的一子流程示意图；
图9为图3所示方法中步骤S50的一子流程示意图；
图10为本申请一些实施例中电池过流检测装置的示意图；
图11为本申请一些实施例中电池管理系统的结构示意图。
具体实施方式
下面将结合附图对本申请技术方案的实施例进行详细的描述。以下实施例仅用于更加清楚地说明本申请的技术方案，因此只作为示例，而不能以此来限制本申请的保护范围。
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本文中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。
在本申请实施例的描述中，技术术语“第一”“第二”等仅用于区别不同对象，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量、特定顺序或主次关系。在本申请实施例的描述中，“多个”的含义是两个以上，除非另有明确具体的限定。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
在本申请实施例的描述中，术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请实施例的描述中，术语“多个”指的是两个以上(包括两个)，同理，“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
随着绿色能源的发展，电池的应用越来越广泛，尤其是在近年来兴起的新能源汽车领域、信息家电领域或光伏发电领域，电池都作为重要的储能供电设备，例如，为新能源汽车或终端设备等供电，为太阳能板储能。随着电池应用领域的不断扩大，其市场的需求量也在不断地扩增。
为了电池的安全，在充放电过程中避免因过流、过充电压或过热等故障导致电池损坏，设计了电池管理系统(BATTERY MANAGEMENT SYSTEM,BMS)，作为电池的保护和管理单元。如图1所示，电池100包括电池本体10和电池管理系统20，电池本体10可以为电芯、一个或多个电芯模组。
电池管理系统20包括电压采样模块21、电流采样模块22、温度传感器23、控制器24和开关电路25等。其中，电压采样模块21用于实时采集电池本体10的电压、被动均衡电量等，电流采样模块22用于对电池本体10在充放电过程中的电流进行采样，温度传感器23用于实时采集电池本体10的温度。电压采样模块21和电流采样模块22将采集到的数据传输至控制器24(MCU)，控制器24根据采集到的数据确定电池100所需的欠压、过压、过流、短路、过温和低温等异常状态对应的保护措施，然后根据确定的保护措施，控制开关电路25选择性地断开或导通电池100与外部设备30(负载或充电器)的连接，以实施该确定的保护措施。可以理解的是，电压采样模块21和电流采样模块22可以由现有的芯片模组(例如集成电路IC)或本领域常规电路实现，在此不详细介绍电压采样模块21和电流采样模块22的电路结构。温度传感器23可以由现有的热电阻或热电偶等实现，在此不详细介绍温度传感器23的结构和原理。
开关电路25可以由现有的MOS管和熔断器实现。在一些实施方式中，如图2所示，开关电路25包括两个MOS管251和熔断器252，两个 MOS管251与熔断器252串联，两个MOS管251的控制端分别与控制器24连接。然后，开关电路25连接电池本体10和外部设备30(负载或充电器)，相当于开关电路25与外部设备30串联。可以理解的是，MOS管251在电流阈值范围内或电压阈值范围内，在控制器24施加的驱动电压作用下，能够导通和断开。当控制器24根据电压采样模块21、电流采样模块22和温度传感器23采集到的数据确定出现过电流、过充电流或过温等异常状态时，控制MOS管251断开，使得电池100与外部设备30(负载或充电器)断开，以防止电池100因过电流、过电压或过温而发生燃爆。
其中，当电池100的检测电流大于预设的电流阈值时，确定发生过流故障，触发MOS管251断开电池100与外部设备30(充电设备或供电设备)的连接。可以理解的是，检测电流的准确性以及电流阈值的精确合理性，直接影响过流故障检测的准确性。
为了能够能准确检测出电池的过流故障，本申请发明人经过研究发现，可以提高检测电流的准确性，使得检测电流有效合理，能准确反映电池当前所在回路中的电流，例如，使用精度高的电流传感器采集检测电流，或，采用多个电流传感器采集电流，从多个电流中确定最终的检测电流。还可以优化电流阈值的精确合理性，使得电流阈值在电池所处的状态下更加合理，例如，考虑电池的充放电状态或电池的温度对电流阈值的影响。可以理解的是，当电池的温度较高时，若电流阈值偏大，则容易导致电池因电流大而进一步发热，容易产生燃爆。当电池处于充电状态下时，若电流阈值偏大，则容易导致电池大电流充电，不容易充满。
具体地，为了提高检测电流的准确性，获取电池负极的第一电流以及电池正极的第二电流，根据检测电流确定策略，从第一电流及第二电流中确定当前检测电流。即从电池正极和负极处分别采集第一电流和第二电流，按预设的检测电流确定策略，从第一电流及第二电流中确定当前检测电流，能够降低因采集故障而导致电流不准确的风险，确保当前检测电流的准确性，相比于直接使用第一电流或第二电流，可以有效防 止因第一电流或第二电流的采集误差使得当前检测电流不准确。
为了优化电流阈值的精确合理性，首先，获取该电池的充放电状态和该电池的当前温度，然后，根据当前温度和充放电状态，确定电流阈值，若当前检测电流超过电流阈值满足预设条件，则确定电池发生过流故障。其中，电流阈值是根据电池的充放电状态和当前温度确定的，即考虑到了充放电状态和当前温度对电流阈值的影响，例如高温和低温下所需要的电流阈值不同，充电状态和放电状态下所需要的电流阈值不同，使得电流阈值与充放电状态和当前温度相匹配，更加精细化。最后，在将当前检测电流与电流阈值进行比较时，当前检测电流超过电流阈值满足预设条件，确定电池发生过流故障，使得检测结果准确。
也即，通过确保当前检测电流准确、设置准确合理的电流阈值以及在比较过程中设置预设条件，使得过流检测更加准确可靠，有效减少误报，从而，能准确检测出电池的过流故障。
本申请实施例公开的电池可以但不限用于车辆、船舶或飞行器等用电装置中。可以使用具备本申请公开的电池等组成该用电装置的电源系统，这样，基于电池具有准确可靠的过流检测和过流保护功能，使得用电装置和电源系统，更加安全可靠。
本申请实施例提供一种使用电池作为电源的用电装置，用电装置可以为但不限于手机、平板、笔记本电脑、电动玩具、电动工具、电瓶车、电动汽车、轮船、航天器等等。其中，电动玩具可以包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等，航天器可以包括飞机、火箭、航天飞机和宇宙飞船等等。
根据本申请的一些实施例，请参阅图3，图3为本申请实施例提供的电池过流检测方法的流程示意图，该方法S100具体可以包括如下步骤：
S10：获取电池负极的第一电流以及电池正极的第二电流。
第一电流为从电池负极处采集到的电流。具体的，传感器A采集电池负极处的电流信号A，电流信号A经过模数转换处理后得到第一电流；传感器B采集电池正极处的电流信号B，电流信号B经过模数转换处理 后得到第二电流。可以理解的是，第一电流和第二电流是同一回路中，不同位置采集到的电流，理论上，第一电流和第二电流应该相差较小或一致。
S20：根据检测电流确定策略，从第一电流及第二电流中确定当前检测电流。
其中，检测电流确定策略用于指导从第一电流和第二电流中确定当前检测电流。可以理解的是，若直接使用第一电流(或第二电流)作为当前检测电流，在第一电流(或第二电流)的采集出现故障的情况下，第一电流(或第二电流)误差较大，使得当前检测电流不准确。
基于预先设置的检测电流确定策略，从电池负极的第一电流和电池正极的第二电流中确定当前检测电流，能够确保当前检测电流的准确性，相比于直接使用第一电流或第二电流，可以有效防止因第一电流或第二电流的采集误差使得当前检测电流不准确。
S30：获取该电池的充放电状态和该电池的当前温度。
可以理解的是，电池的充放电状态包括充电状态或放电状态。当电池与充电器连接时，电池处于充电状态，当电池与负载连接时，电池处于放电状态。电池在充电状态和放电状态下的电流方向相反，电池管理系统中的控制器可以根据电流方向解析出充放电状态。
电池的当前温度通常由温度传感器检测得到，例如将温度传感器可以贴在电池中电芯模组的表面，以采集温度信号，再将温度信号转换为当前温度。可以理解的是，温度传感器实时采集温度信号得到当前温度。
S40：根据当前温度和充放电状态，确定电流阈值。
电流阈值为用于与当前检测电流进行对比的电流阈值，若当前检测电流超过电流阈值则可以确定发生过流故障。电流阈值是根据电池的充放电状态和当前温度确定的，即考虑到了充放电状态和当前温度对电流阈值的影响，例如高温和低温下所需要的电流阈值不同，充电状态和放电状态下所需要的电流阈值不同，使得电流阈值与充放电状态和当前温度相匹配，更加精细化。
S50：若当前检测电流超过电流阈值满足预设条件，则确定电池发 生过流故障。
在将当前检测电流与电流阈值进行比较时，当前检测电流超过电流阈值满足预设条件，确定电池发生过流故障，使得检测结果准确。可以理解的是，预设条件用于限制当前检测电流超过电流阈值，为使得检测结果更加谨慎准确的条件，例如，可以为当前检测电流超过电流阈值的值达到一定百分比。
在上述实施方式中，首先，基于预先设置的检测电流确定策略，从电池负极的第一电流和电池正极的第二电流中确定当前检测电流，能够确保当前检测电流的准确性，相比于直接使用第一电流或第二电流，可以有效防止因第一电流或第二电流的采集误差使得当前检测电流不准确。其次，电流阈值是根据电池的充放电状态和当前温度确定的，即考虑到了充放电状态和当前温度对电流阈值的影响，例如高温和低温下所需要的电流阈值不同，充电状态和放电状态下所需要的电流阈值不同，使得电流阈值与充放电状态和当前温度相匹配，更加精细化。最后，在将当前检测电流与电流阈值进行比较时，当前检测电流超过电流阈值满足预设条件，确定电池发生过流故障，使得检测结果准确。也即，通过确保当前检测电流准确、设置准确合理的电流阈值以及在比较过程中设置预设条件，使得过流检测更加准确可靠，有效减少误报，从而，能准确检测出电池的过流故障。
根据本申请的一些实施例，可选地，请参阅图4，步骤S20具体包括：
S21：分别对第一电流和第二电流进行有效性校验。
S22：对第一电流和第二电流进行合理性校验。
S23：根据有效性校验的结果和合理性校验的结果，确定当前检测电流。
有效性校验可以理解为对电流采集过程是否发生故障进行验证，确定电流的采集过程正常。例如，若第一电流远小于传感器的检测范围，或远大于传感器的检测范围，即说明第一电流的采集过程发生故障，该第一电流是无效的。
可以理解的是，第一电流和第二电流是同一回路中，不同位置采集到的电流，理论上，第一电流和第二电流应该相差较小或一致。从而，合理性校验可以理解为对第一电流和第二电流是否是同一回路的电流进行验证。可以理解的是，若第一电流和第二电流之间的差异异常大，则明显第一电流和第二电流不合理。
在上述实施方式中，对采集到的第一电流和第二电流分别进行有效性校验和合理性校验，获取第一电流的有效性和合理性以及第二电流的有效性和合理性，然后，据此确定当前检测电流，即当前检测电流是在考虑第一电流的有效性和合理性以及第二电流的有效性和合理性后确定的，更加准确，有益于提高过流检测的准确性。
根据本申请的一些实施例，可选地，请参阅图5，步骤S21具体包括：
S211：若第一电流在第一预设测量范围内，且第一电流的零漂值小于或等于第一预设零漂阈值，则确定第一电流有效。
S212：若第二电流在第二预设测量范围内，且第二电流的零漂值小于或等于第二预设零漂阈值，则确定第二电流有效。
其中，第一预设测量范围为用于测量第一电流的第一电流传感器的测量范围，第二预设测量范围为用于测量第二电流的第二电流传感器的测量范围。
可以理解的是，第一预设零漂阈值是反映第一电流传感器的零点漂移的阈值。第二预设零漂阈值是反映第二电流传感器的零点漂移的阈值。零点漂移是指放大电路在没有输入信号时，用灵敏的直流表测量输出端，会有缓慢的输出电压产生，即电流信号的波形的基线与零线偏移。
若第一电流在第一预设测量范围内，说明第一电流传感器正常，若第一电流的零漂值小于或等于第一预设零漂阈值，说明第一电流传感器状态稳定，因此，在这两个条件均满足时，第一电流有效。
若第二电流在第二预设测量范围内，说明第二电流传感器正常，若第二电流的零漂值小于或等于第二预设零漂阈值，说明第二电流传感器状态稳定，因此，在这两个条件均满足时，第二电流有效。可以理解的 是，状态稳定可以为温度和输入的电压稳定，受到的干扰小。
在本申请上述实施方式中，结合第一电流传感器的测量范围和第一预设零漂阈值，检测第一电流的有效性，能准确确定第一电流的有效性。若第一电流有效，则第一电流在第一预设测量范围内且其零漂值合理，说明第一电流传感器正常，且第一电流是在第一电流传感器状态稳定的情况下获取的，受到的干扰较小。
同理，结合第二电流传感器的测量范围和第二预设零漂阈值，检测第二电流的有效性，能准确确定第二电流的有效性。若第二电流有效，则第二电流在第二预设测量范围内且其零漂值合理，说明第二电流传感器正常，且第二电流是在第二电流传感器状态稳定的情况下获取的，受到的干扰较小。
根据本申请的一些实施例，可选地，请参阅图6，步骤S22具体包括：
S221：若第一电流和第二电流之间的差值在预设偏差范围内，则确定第一电流和第二电流合理。
S222：若第一电流和第二电流之间的差值不在预设偏差范围内，则确定第一电流和第二电流不合理。
基于第一电流和第二电流是同一回路中，不同位置采集到的电流，理论上，第一电流和第二电流应该相差较小或一致。为了表征差异大小，采用预设偏差范围作为判断基础。可以理解的是，预设偏差范围为一个电流范围，可以由本领域技术人员根据两个电流传感器精度及实际测试情况确定。
在上述实施方式中，第一电流和第二电流是同一回路在同一状态下的电流，由不同的传感器检测，理论上第一电流和第二电流应该相同或相近，从而，通过比较第一电流和第二电流之间的差值是否在预设偏差范围内，即可确定第一电流和第二电流的合理性，确保采集到的第一电流和第二电流是同一回路在同一状态下的电流，以免因第一电流或第二电流的采集延迟，而导致根据第一电流和第二电流确定的当前检测电流不准确，影响最终的检测结果。
根据本申请的一些实施例，可选地，请参阅图7，步骤S23具体包括：
S231：若第一电流和第二电流均有效，且第一电流和第二电流合理，则确定当前检测电流为第一电流。
本申请发明人在历史实验中发现，在负极处的电流传感器具有更高精度，因此，第一电流和第二电流均有效且合理的情况下，选择负极处的第一电流作为当前检测电流更加精确。其中，历史实验包括采集多组有效且合理的第一电流和第二电流，分别将第一电流作为当前检测电流，将第二电流作为当前检测电流，进行过流检测，统计这两种情况下检测结果的准确率，发现将第一电流作为当前检测电流这种情况下的检测结果的准确率更高。
S232：若第一电流和第二电流均有效，且第一电流和第二电流不合理，则确定当前检测电流为第一电流和第二电流中的较大值。
在第一电流和第二电流均有效且不合理的情况下，若选择两者中较小的作为当前检测电流与电流检测阈值进行对比，容易产生误判。相反，选择两者中较大的作为当前检测电流，使得检测结果更加谨慎，准确度更高。
S233：若第一电流和第二电流中的一个有效，另一个无效，则确定当前检测电流为有效的电流。
可以理解的是，在第一电流和第二电流中一个有效、另一个无效的情况下，确定当前检测电流为有效的电流，比较合适。
S234：若第一电流和第二电流均无效，且第一电流大于或等于第一预设测量范围的上限、第二电流大于或等于第二预设测量范围的上限，则确定当前检测电流为第一电流和第二电流中的较大值。
在第一电流和第二电流均无效且第一电流超过第一电流传感器的测量范围上限、第二电流超过第二电流传感器的测量方位上限时，即第一电流和第二电流均出现超限错误的情况下，若选择两者中较小的作为当前检测电流与电流检测阈值进行对比，容易产生误判。相反，选择两者中较大的作为当前检测电流，使得检测结果更加谨慎，准确度更高。
S235：若第一电流和第二电流均无效，且第一电流小于第一预设测量范围的上限和/或第二电流小于第二预设测量范围的上限，则确定当前检测电流为上一检测周期的检测电流。
在第一电流和第二电流均无效且第一电流和第二电流均未出现超限错误的情况下，说明第一电流小于第一电流传感器的测量范围下限，第二电流小于第二电流传感器的测量范围下限，均无效，若选择其中任何一个作为当前检测电流，误差均较大。因此，确定当前检测电流为上一检测周期的检测电流，使得检测结果更加谨慎，准确度更高。
在上述实施方式中，在第一电流和第二电流均有效且合理的情况下，经过历史实验数据发现，选择负极处的第一电流作为当前检测电流更加精确。在第一电流和第二电流均有效且不合理的情况下，选择两者中较大的作为当前检测电流，使得检测结果更加谨慎，准确度更高。在第一电流和第二电流中一个有效、另一个无效的情况下，确定当前检测电流为有效的电流，比较合适。在第一电流和第二电流均无效且第一电流超过第一电流传感器的测量范围上限、第二电流超过第二电流传感器的测量方位上限时，即第一电流和第二电流均出现超限错误的情况下，确定当前检测电流为第一电流和第二电流中的较大值，使得检测结果更加谨慎，准确度更高。在第一电流和第二电流均无效且第一电流和第二电流均未出现超限错误的情况下，确定当前检测电流为上一检测周期的检测电流，使得检测结果更加谨慎，准确度更高。
根据本申请的一些实施例，可选地，第一电流传感器和第二电流传感器的工作原理不同，第一电流传感器由第一供电单元供电，第二电流传感器由第二供电单元供电，第一供电单元和第二供电单元相互独立。
第一电流传感器和第二电流传感器的类型不同，工作原理不同，例如第一电流传感器可以为现有的霍尔电流传感器，第二电流传感器可以为现有的罗氏线圈型电流传感器。两个工作原理不同的电流传感器分别采集电流，能够避免两个电流传感器因同一原因导致失效，即避免两个电流传感器共因失效。
若第一电流传感器和第二电流传感器与电池连接，若电池的电压不 稳定时，容易使得第一电流和第二电流都存在较大的零漂，影响当前检测电流的准确性。从而，第一电流传感器由第一供电单元供电(例如电池1#)，第二电流传感器由第二供电单元供电(例如电池2#)，可以有益于增加当前检测电流的准确性，以及，避免因供电原因导致两个电流传感器同时失效。
在上述实施方式中，基于第一电流传感器和第二电流传感器的工作原理不同，相当于类型不同的两个电流传感器，能够避免两个电流传感器因同一原因导致失效，即避免两个电流传感器共因失效。当第一电流传感器和第二电流传感器的工作原理不同时，能减少两者同时失效的风险，使得当前检测电流更加准确，有益于提高检测结果的准确性。此外，第一电流传感器和第二电流传感器分别由两个独立的供电单元供电，避免因供电原因导致两个电流传感器同时失效。也即，通过上述方式，使得第一电流和第二电流分别是通过两个独立的采集路径采集到的，互不影响，使得当前检测电流更加准确，有益于提高检测结果的准确性。
根据本申请的一些实施例，可选地，第一电流传感器输出第一信号，第一信号经第一模数转换器进行模数转换处理得到第一电流。第二电流传感器输出第二信号，第二信号经第二模数转换器进行模数转换处理得到第二电流。其中，第一模数转换器和第二模数转换器相互独立。
可以理解的是，第一模数转换器将第一信号进行模数转换处理得到第一电流。第一电流传感器的类型决定了第一信号，第一信号可以为电流信号或电压信号等。同理，第二模数转换器将第二信号进行模数转换处理得到第二电流。第二电流传感器的类型决定了第二信号，第二信号可以为电流信号或电压信号等。
为了减少因模数转换故障而导致采样失效的风险，第一模数转换器和第二模数转换器相互独立。在一些实施例中，第一模数转换器可以为ADC模数转换器。可以理解的是，在采样前，可以对ADC模数转换器进行校验，例如采集一个预设电压信号(例如2.5V的电压信号)，通过该ADC模数转换器进行转换，若转换出的电压大致为2.5V，则可以确定ADC模数转换器正常。
在一些实施例中，第二模数转换器可以为另一ADC模数转换器，或，型号为AME8550的电压检测器。在采集前，也可对第二模数转换器进行校验，具体的校验方式可由本领域技术人员自行进行设计，在此不再赘述。
在上述实施方式中，第一电流由第一模数转换器处理第一电流传感器采集到的第一信号得到，第二电流由第二模数转换器处理第二电流传感器采集到的第二信号得到，两个模数转换路径相互独立，能够减少因模数转换故障而导致采样失效的风险，使得当前检测电流更加准确，有益于提高检测结果的准确性。
根据本申请的一些实施例，可选地，请参阅图8，步骤S40具体包括：
S41：根据当前温度和充放电状态，在预设的温度阈值关系表中，查找对应的电流阈值。
可以理解的是，充放电状态包括充电状态或放电状态，例如当电池与充电器连接时，处于充电状态，当电池与负载连接时，处于放电状态。
温度阈值关系表包括温度、充电状态和电流阈值之间的对应关系，以及，温度、放电状态和电流阈值之间的对应关系，从而，当获取到当前温度和充放电状态后，查找温度阈值关系表，即可确定对应的电流阈值。例如，温度阈值关系表可以为如下表1所示：
表1温度阈值关系表
Figure PCTCN2021126448-appb-000001
Figure PCTCN2021126448-appb-000002
表1中仅仅是示例性说明，可以理解的是，对于表1中两个分界温度之间的温度，可以按照线性插值法来确定两个分界温度之间的温度对应的电流阈值。例如，若当前温度为T＝-12℃，已知T0＝-15℃，对应的电流阈值I0＝650A，T1＝-10℃，对应的电流阈值I1＝840A，根据以下插值公式，可以得出当前温度T对应的电流阈值I。
Figure PCTCN2021126448-appb-000003
表1中故障容忍时间间隔是指当发生过流故障时必须在故障容忍时间间隔内对电池进行切断保护，即切断电池与外部设备的连接。
在上述实施方式中，预先设置有温度阈值关系表，通过设置温度阈值关系表包括温度、充电状态和电流阈值之间的对应关系，以及，温度、放电状态和电流阈值之间的对应关系，从而，当获取到当前温度和充放电状态后，查找温度阈值关系表，即可确定对应的电流阈值。基于查找到的电流阈值不仅与当前温度相适应，还与当前的充放电状态相适应，使得查找到的电流阈值更加准确、精细化。相比于无论在高温、低温或无论在充电状态、放电状态下均设置一个较为粗略的电流阈值，上述设置温度阈值关系表，并通过查表确定电流阈值的方式，不仅电流阈值更加合理准确，还简单方便。
根据本申请的一些实施例，可选地，预设条件包括当前检测电流超过电流阈值的次数达到预设次数。例如预设次数可以为1次、2次、3次等，具体可根据实际情况设置。
请参阅图9，前述步骤S50具体包括：
S51：若预设次数为一次，则当前检测电流超过电流阈值，确定电池发生过流故障。
在预设次数为一次的情况下，则对当前检测电流和电流阈值进行一次比较，若当前检测电流超过电流阈值，确定电池发生过流故障。
S52：若预设次数为多次，则当当前检测电流超过电流阈值时重新获取新的第一电流和新的第二电流，并根据检测电流确定策略，从新的第一电流和新的第二电流中确定新的当前检测电流；并当新的当前检测电流超过电流阈值时，累计相应的次数，直至当前检测电流超过电流阈值达到预设次数时，确定电池发生过流故障。
例如，预设次数为3次，则若第1次检测到当前检测电流超过电流阈值，则重新获取新的第一电流和第二电流进行第2次检测，例如对原来的第一信号和第二信号重新进行模数转换处理后得到新的第一电流和第二电流，从新的第一电流和新的第二电流中确定新的当前检测电流；并当新的当前检测电流超过电流阈值时，则重新获取新的第一电流和第二电流进行第3次检测、第4次检测等，直到检测出新的当前检测电流超过电流阈值达到3次时，确定电池发生过流故障。
在此实施例中，通过多次更新当前检测电流并比较当前检测电流是否超过电流阈值，累计相应的次数，直到当前检测电流超过电流阈值达到预设次数时，确定电池发生过流故障，即多次检测出过流故障的结果后，才最终确定发生过流故障，能够防止误报，使得最终的检测结果更加准确。
根据本申请的一些实施例，提供了一种电流过流检测方法，包括：
(1)采用两条独立的路径分别采集并获取电池负极的第一电流以及电池正极的第二电流。其中，第一电流对应的独立路径包括第一电流传感器、第一模数转换器和为第一电流传感器供电的第一供电单元。第二电流对应的独立路径包括第二电流传感器、第二模数转换器和为第二电流传感器供电的第二供电单元。
(2)按照以下表2中的检测电流确定策略，从第一电流及第二电流中确定当前检测电流。
表2检测电流确定策略
Figure PCTCN2021126448-appb-000004
Figure PCTCN2021126448-appb-000005
表2中其他错误为非超限错误，结合表2中的检测电流确定策略，对第一电流和第二电流进行有效性和合理性校验，根据有效性和合理性校验结果，确定当前检测电流，使得当前检测电流准确，检测结果更加谨慎，准确度更高。
(3)根据当前温度和充放电状态，在预设的温度阈值关系表中，查找对应的电流阈值。其中，温度阈值关系表包括温度、充电状态和电流阈值之间的对应关系，以及，温度、放电状态和电流阈值之间的对应关系。
(4)若当前检测电流超过电流阈值达到预设次数(例如3次)，则确定电池发生过流故障。
通过设置温度阈值关系表包括温度、充电状态和电流阈值之间的对应关系，以及，温度、放电状态和电流阈值之间的对应关系，从而，当获取到当前温度和充放电状态后，查找温度阈值关系表，即可确定对应的电流阈值。基于查找到的电流阈值不仅与当前温度相适应，还与当前的充放电状态相适应，使得查找到的电流阈值更加准确、精细化。相比于无论在高温、低温或无论在充电状态、放电状态下均设置一个较为粗略的电流阈值，上述设置温度阈值关系表，并通过查表确定电流阈值的方式，不仅电流阈值更加合理准确，还简单方便。
在将当前检测电流与电流阈值进行比较时，当前检测电流超过电流阈值达到预设次数，确定电池发生过流故障，使得检测结果准确。
根据本申请的一些实施例，请参阅图10，本申请还提供了一种电池过流检测装置300，包括：电流获取模块301、当前检测电流确定模块302、状态获取模块303、温度获取模块304、阈值确定模块305和故障确定模块306。
其中，电流获取模块301，用于获取电池负极的第一电流以及电池正极的第二电流。当前检测电流确定模块302，用于根据检测电流确定策略，从第一电流及第二电流中确定当前检测电流。状态获取模块303，用于获取电池的充放电状态。温度获取模块304，用于获取电池的当前温度。阈值确定模块305，用于根据当前温度和充放电状态，确定电流阈值。故障确定模块306，用于若当前检测电流超过电流阈值满足预设条件，则确定电池发生过流故障。
在上述实施方式中，当前检测电流确定模块302基于预先设置的检测电流确定策略，从电池负极的第一电流和电池正极的第二电流中确定当前检测电流，能够确保当前检测电流的准确性，相比于直接使用第一电流或第二电流，可以有效防止因第一电流或第二电流的采集误差使得当前检测电流不准确。其次，电流阈值是阈值确定模块根据电池的充放电状态和当前温度确定的，即考虑到了充放电状态和当前温度对电流阈值的影响，例如高温和低温下所需要的电流阈值不同，充电状态和放电状态下所需要的电流阈值不同，使得电流阈值与充放电状态和当前温度相匹配，更加精细化。最后，故障确定模块306在将当前检测电流与电流阈值进行比较时，当前检测电流超过电流阈值满足预设条件，确定电池发生过流故障，使得检测结果准确。也即，通过确保当前检测电流准确、设置准确合理的电流阈值以及在比较过程中设置预设条件，使得过流检测更加准确可靠，有效减少误报，从而，能准确检测出电池的过流故障。
根据本申请的一些实施例，请参阅图11，本申请还提供一种电池管理系统400，包括：第一电流传感器401、第二电流传感器402、温度传感器403、处理器404和存储器405。
其中，第一电流传感器401连接于电池负极处，用于采集电池负极 的第一电流，第二电流传感器402连接于电池正极处，用于采集电池正极的第二电流。温度传感器403可以贴在电池中电芯模组的表面，用于采集电池的当前温度。
处理器404分别与第一电流传感器401、第二电流传感器402和温度传感器403通信连接，以获取第一电流、第二电流以及当前温度。存储器405与处理器404通信连接，存储器405存储有可被处理器404执行的指令，该指令被处理器404执行，以使处理器404能够执行第一方面的电池过流检测方法。
其中，存储器405可以包括只读存储器和随机存取存储器，并向处理器404提供指令和数据。存储器405的一部分还可以包括非易失性随机存取存储器(non-volatile random accedd memory，NVRAM)。存储器405存储有操作指令、可执行模块或者数据结构，或者它们的子集，或者它们的扩展集。
处理器404可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述电流过流检测方法的各步骤可以通过处理器404中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器404可以是通用处理器、数字信号处理器(diginal signal processing，DSP)、微处理器或微控制器，还可进一步包括专用集成电路(application specific integrated circuit，ASIC)、现场可编程门阵列(field-programmable gate array，FPGA)或者其它可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。该处理器可实现或者执行前述电池过流检测方法。
基于电池管理系统400能够执行前述电池过流检测方法，电池管理系统400能够实现准确可靠的过流检测功能。
根据本申请的一些实施例，本申请还提供了一种电池，包括前述电池管理系统。
在上述实施方式中，电池具有准确可靠的过流检测和过流保护功能，更加安全可靠。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案， 而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围，其均应涵盖在本申请的权利要求和说明书的范围当中。尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (12)

  1. 一种电池过流检测方法，其特征在于，所述方法包括：
    获取所述电池负极的第一电流以及所述电池正极的第二电流；
    根据检测电流确定策略，从所述第一电流及所述第二电流中确定当前检测电流；
    获取所述电池的充放电状态和所述电池的当前温度；
    根据所述当前温度和所述充放电状态，确定电流阈值；
    若所述当前检测电流超过所述电流阈值满足预设条件，则确定所述电池发生过流故障。
  2. 根据权利要求1所述的方法，其特征在于，所述根据检测电流确定策略，从所述第一电流及所述第二电流中确定当前检测电流，包括：
    分别对所述第一电流和所述第二电流进行有效性校验；
    对所述第一电流和所述第二电流进行合理性校验；
    根据所述有效性校验的结果和所述合理性校验的结果，确定所述当前检测电流。
  3. 根据权利要求2所述的方法，其特征在于，所述分别对所述第一电流和所述第二电流进行有效性校验，包括：
    若所述第一电流在第一预设测量范围内，且所述第一电流的零漂值小于或等于第一预设零漂阈值，则确定所述第一电流有效；或，
    若所述第二电流在第二预设测量范围内，且所述第二电流的零漂值小于或等于第二预设零漂阈值，则确定所述第二电流有效；
    其中，所述第一预设测量范围为用于测量所述第一电流的第一电流传感器的测量范围，所述第二预设测量范围为用于测量所述第二电流的第二电流传感器的测量范围。
  4. 根据权利要求3所述的方法，其特征在于，所述对所述第一电流和所述第二电流进行合理性校验，包括：
    若所述第一电流和所述第二电流之间的差值在预设偏差范围内，则确定所述第一电流和所述第二电流合理；或，
    若所述第一电流和所述第二电流之间的差值不在所述预设偏差范围内，则确定所述第一电流和所述第二电流不合理。
  5. 根据权利要求4所述的方法，其特征在于，所述根据所述有效性校验的结果和所述合理性校验的结果，确定所述当前检测电流，包括：
    若所述第一电流和所述第二电流均有效，且所述第一电流和所述第二电流合理，则确定所述当前检测电流为所述第一电流；或，
    若所述第一电流和所述第二电流均有效，且所述第一电流和所述第二电流不合理，则确定所述当前检测电流为所述第一电流和所述第二电流中的较大值；或，
    若所述第一电流和所述第二电流中的一个有效，另一个无效，则确定所述当前检测电流为有效的电流；或，
    若所述第一电流和所述第二电流均无效，且所述第一电流大于或等于所述第一预设测量范围的上限、所述第二电流大于或等于所述第二预设测量范围的上限，则确定所述当前检测电流为所述第一电流和所述第二电流中的较大值；或，
    若所述第一电流和所述第二电流均无效，且所述第一电流小于所述第一预设测量范围的上限和/或所述第二电流小于所述第二预设测量范围的上限，则确定所述当前检测电流为上一检测周期的检测电流。
  6. 根据权利要求3-5任意一项所述的方法，其特征在于，所述第一电流传感器和所述第二电流传感器的工作原理不同，所述第一电流传感器由第一供电单元供电，所述第二电流传感器由第二供电单元供电，所述第一供电单元和所述第二供电单元相互独立。
  7. 根据权利要求6所述的方法，其特征在于，所述第一电流传感器输出第一信号，所述第一信号经第一模数转换器进行模数转换处理得到所述第一电流；
    所述第二电流传感器输出第二信号，所述第二信号经第二模数转换器进行模数转换处理得到所述第二电流；
    其中，所述第一模数转换器和所述第二模数转换器相互独立。
  8. 根据权利要求1-7任意一项所述的方法，其特征在于，所述根据 所述当前温度和所述充放电状态，确定电流阈值，包括：
    根据所述当前温度和所述充放电状态，在预设的温度阈值关系表中，查找对应的电流阈值；
    其中，所述充放电状态包括充电状态或放电状态，所述温度阈值关系表包括温度、充电状态和电流阈值之间的对应关系，以及，温度、放电状态和电流阈值之间的对应关系。
  9. 根据权利要求1-7任意一项所述的方法，其特征在于，所述预设条件包括所述当前检测电流超过所述电流阈值的次数达到预设次数，所述若所述当前检测电流超过所述电流阈值满足预设条件，则确定所述电池发生过流故障，包括：
    若预设次数为一次，则所述当前检测电流超过所述电流阈值，确定所述电池发生过流故障；或，
    若预设次数为多次，则当所述当前检测电流超过所述电流阈值时重新获取新的第一电流和新的第二电流，并根据所述检测电流确定策略，从所述新的第一电流和所述新的第二电流中确定新的当前检测电流；并当所述新的当前检测电流超过所述电流阈值时，累计相应的次数，直至当前检测电流超过所述电流阈值达到所述预设次数时，确定所述电池发生过流故障。
  10. 一种过流检测装置，其特征在于，包括：
    电流获取模块，用于获取所述电池负极的第一电流以及所述电池正极的第二电流；
    当前检测电流确定模块，用于根据检测电流确定策略，从所述第一电流及所述第二电流中确定当前检测电流；
    状态获取模块，用于获取所述电池的充放电状态；
    温度获取模块，用于获取所述电池的当前温度；
    阈值确定模块，用于根据所述当前温度和所述充放电状态，确定电流阈值；
    故障确定模块，用于若所述当前检测电流超过所述电流阈值满足预设条件，则确定所述电池发生过流故障。
  11. 一种电池管理系统，其特征在于，包括：
    第一电流传感器，用于采集电池负极的第一电流；
    第二电流传感器，用于采集所述电池正极的第二电流；
    温度传感器，用于采集所述电池的当前温度；
    处理器，所述处理器分别与所述第一电流传感器、所述第二电流传感器和所述温度传感器通信连接，以获取第一电流、第二电流以及当前温度；
    存储器，所述存储器与所述处理器通信连接，所述存储器存储有可被所述处理器执行的指令，所述指令被所述处理器执行，以使所述处理器能够执行如权利要求1-9中任意一项所述的方法。
  12. 一种电池，其特征在于，包括如权利要求11所述的电池管理系统。
PCT/CN2021/126448 2021-10-26 2021-10-26 一种电池过流检测方法、电池管理系统及电池 WO2023070321A1 (zh)

Priority Applications (4)

Application Number Priority Date Filing Date Title
PCT/CN2021/126448 WO2023070321A1 (zh) 2021-10-26 2021-10-26 一种电池过流检测方法、电池管理系统及电池
EP21961697.6A EP4317995A1 (en) 2021-10-26 2021-10-26 Battery overcurrent detection method, battery management system, and battery
CN202180098357.6A CN117321427A (zh) 2021-10-26 2021-10-26 一种电池过流检测方法、电池管理系统及电池
US18/495,239 US20240061048A1 (en) 2021-10-26 2023-10-26 Method for overcurrent detection in battery, battery management system, and battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/126448 WO2023070321A1 (zh) 2021-10-26 2021-10-26 一种电池过流检测方法、电池管理系统及电池

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/495,239 Continuation US20240061048A1 (en) 2021-10-26 2023-10-26 Method for overcurrent detection in battery, battery management system, and battery

Publications (1)

Publication Number Publication Date
WO2023070321A1 true WO2023070321A1 (zh) 2023-05-04

Family

ID=86158974

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/126448 WO2023070321A1 (zh) 2021-10-26 2021-10-26 一种电池过流检测方法、电池管理系统及电池

Country Status (4)

Country Link
US (1) US20240061048A1 (zh)
EP (1) EP4317995A1 (zh)
CN (1) CN117321427A (zh)
WO (1) WO2023070321A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117335534A (zh) * 2023-12-01 2024-01-02 广东采日能源科技有限公司 电池充放电短路保护及采样电路
CN117526529A (zh) * 2024-01-05 2024-02-06 上海泰矽微电子有限公司 一种充电控制方法、装置、电子设备和介质

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011137682A (ja) * 2009-12-28 2011-07-14 Panasonic Corp 電池異常検出回路、電池電源装置、及び電池電源システム。
CN102355021A (zh) * 2011-09-26 2012-02-15 惠州市亿能电子有限公司 一种电动汽车电池充放电电流控制方法
CN104391251A (zh) * 2014-11-18 2015-03-04 郑州日产汽车有限公司 电动汽车电池管理系统数据采集方法
CN104714187A (zh) * 2015-03-23 2015-06-17 重庆长安汽车股份有限公司 动力电池异常判定方法及系统
CN106374152A (zh) * 2016-09-30 2017-02-01 北京珠穆朗玛移动通信有限公司 一种电池异常处理方法、装置、移动终端和系统
CN108152558A (zh) * 2017-11-23 2018-06-12 北京新能源汽车股份有限公司 一种电流采样系统和电动汽车
CN108501757A (zh) * 2018-04-27 2018-09-07 北京新能源汽车股份有限公司 一种电池管理系统、电流采样方法、装置及电动汽车

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011137682A (ja) * 2009-12-28 2011-07-14 Panasonic Corp 電池異常検出回路、電池電源装置、及び電池電源システム。
CN102355021A (zh) * 2011-09-26 2012-02-15 惠州市亿能电子有限公司 一种电动汽车电池充放电电流控制方法
CN104391251A (zh) * 2014-11-18 2015-03-04 郑州日产汽车有限公司 电动汽车电池管理系统数据采集方法
CN104714187A (zh) * 2015-03-23 2015-06-17 重庆长安汽车股份有限公司 动力电池异常判定方法及系统
CN106374152A (zh) * 2016-09-30 2017-02-01 北京珠穆朗玛移动通信有限公司 一种电池异常处理方法、装置、移动终端和系统
CN108152558A (zh) * 2017-11-23 2018-06-12 北京新能源汽车股份有限公司 一种电流采样系统和电动汽车
CN108501757A (zh) * 2018-04-27 2018-09-07 北京新能源汽车股份有限公司 一种电池管理系统、电流采样方法、装置及电动汽车

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117335534A (zh) * 2023-12-01 2024-01-02 广东采日能源科技有限公司 电池充放电短路保护及采样电路
CN117335534B (zh) * 2023-12-01 2024-03-19 广东采日能源科技有限公司 电池充放电短路保护及采样电路
CN117526529A (zh) * 2024-01-05 2024-02-06 上海泰矽微电子有限公司 一种充电控制方法、装置、电子设备和介质
CN117526529B (zh) * 2024-01-05 2024-03-08 上海泰矽微电子有限公司 一种充电控制方法、装置、电子设备和介质

Also Published As

Publication number Publication date
CN117321427A (zh) 2023-12-29
EP4317995A1 (en) 2024-02-07
US20240061048A1 (en) 2024-02-22

Similar Documents

Publication Publication Date Title
WO2023070321A1 (zh) 一种电池过流检测方法、电池管理系统及电池
US10908227B2 (en) Method and system for detecting resistance of internal short circuit of battery
US10974613B2 (en) Method and system for determining discharging process of battery
WO2021068121A1 (zh) 电池检测方法、电池、电子设备和存储介质
US9476778B2 (en) Rechargeable battery temperature detection method, power management device and electronic system
TW201029288A (en) Protection circuit with timer, battery systems and protection methods
CN105846493B (zh) 过流检测、保护电路及电池
US20200064411A1 (en) Mobile platform, computer readable storage medium, battery and control method and system thereof
CN102692281B (zh) 组合式锂电池温度检测电路
CN111812474A (zh) 直流充电桩绝缘检测电路、系统及方法
WO2022057583A1 (zh) 一种电池充电控制方法和装置
WO2021063288A1 (zh) 一种电池及汽车诊断平板
CN102735915A (zh) 电池电压检测装置以及电池电压检测方法
Gu et al. A precise minor-fault diagnosis method for lithium-ion batteries based on phase plane sample entropy
TWI754943B (zh) 智慧電池裝置
WO2018158505A1 (en) Method, controllling unit and electronic charging arrangement for determining state of charge of a battery during charging of the battery
JP2022521953A (ja) 温度測定装置、これを含むバッテリ装置および温度測定方法
CN112130077A (zh) 一种不同工况下动力电池组的soc估算方法
CN108363012B (zh) 一种车用锂电池启动电源关键器件故障检测系统及方法
EP4057477A1 (en) Cell fault detection in batteries with parallel cells
EP4123867B1 (en) Smart battery device, and electronic device thereof
US10436852B2 (en) Battery monitoring using a redundant neighbor measurement
CN109387785B (zh) 一种多串电池组的单节电压采集系统
CN114019396A (zh) 一种电池包阻抗检测方法及装置
CN117554845B (zh) 电池健康状态评估方法、装置、电子设备及存储介质

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21961697

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 21961697.6

Country of ref document: EP

Ref document number: 2021961697

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2021961697

Country of ref document: EP

Effective date: 20231026

WWE Wipo information: entry into national phase

Ref document number: 202180098357.6

Country of ref document: CN

NENP Non-entry into the national phase

Ref country code: DE