CN113391228A - Battery internal resistance and health state monitoring method and electronic device - Google Patents

Battery internal resistance and health state monitoring method and electronic device Download PDF

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Publication number
CN113391228A
CN113391228A CN202110662730.8A CN202110662730A CN113391228A CN 113391228 A CN113391228 A CN 113391228A CN 202110662730 A CN202110662730 A CN 202110662730A CN 113391228 A CN113391228 A CN 113391228A
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battery
discharge
battery cell
internal resistance
current
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杨培磊
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Dongguan Poweramp Technology Ltd
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Dongguan Poweramp Technology Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/389—Measuring internal impedance, internal conductance or related variables
    • 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]
    • G01R31/392—Determining battery ageing or deterioration, e.g. state of health
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • 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)
  • Secondary Cells (AREA)

Abstract

The application provides a battery internal resistance and health state monitoring method and an electronic device, wherein the method comprises the following steps: acquiring a first mapping relation between the open-circuit voltage and the discharge depth of the battery cell in a standard discharge state; acquiring a second mapping relation between the open-circuit voltage and the discharge depth of the battery cell in an actual discharge state; calculating the current discharge depth of the battery cell according to the current charge state of the battery cell; determining a first open-circuit voltage according to the current discharge depth of the battery cell and the first mapping relation; determining a second open-circuit voltage according to the current discharge depth of the battery cell and a second mapping relation; and calculating the internal resistance of the battery cell according to the first open-circuit voltage, the second open-circuit voltage and the current discharge current. The method and the device improve the accuracy of monitoring the health state of the battery based on the internal resistance of the battery.

Description

Battery internal resistance and health state monitoring method and electronic device
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a method for monitoring internal resistance and health status of a battery and an electronic device.
Background
The lithium battery has the characteristics of high energy density, small volume, light weight, high cycle frequency, high charging efficiency and the like, and is widely applied to new energy equipment such as electric automobiles, AI robots and the like. Along with the increase of the charging and discharging cycle times of the lithium battery or the battery failure, the battery performance is abnormal or attenuated, and in order to ensure the normal operation of equipment, the health state of the battery is necessary to be monitored. SOH (state Of health), which is generally a key indicator characterizing the state Of health Of a battery, is determined by the ratio Of the actual discharge capacity Of the battery to the initial maximum capacity. However, in the actual use process of the battery, on one hand, due to the inconsistency of the battery cells, the battery is prone to have unreleased capacity, and on the other hand, the battery is not discharged at a discharge depth of 100%, so that an error occurs in the measurement of the actual discharge capacity, and the state of health of the battery is misjudged.
Disclosure of Invention
In view of the above, it is desirable to provide a battery internal resistance and health status monitoring method and an electronic device, which can monitor the health status of the battery by dynamically calculating the internal resistance of the battery cell.
An embodiment of the present application provides a method for monitoring internal resistance of a battery, where the method includes: the method comprises the steps of obtaining a first mapping relation between the open-circuit voltage and the discharge depth of a battery cell in a standard discharge state, obtaining a second mapping relation between the open-circuit voltage and the discharge depth of the battery cell in an actual discharge state, calculating the current discharge depth of the battery cell according to the current charge state of the battery cell, and determining a first open-circuit voltage V according to the current discharge depth of the battery cell and the first mapping relationcDetermining a second open-circuit voltage V according to the current discharge depth of the battery cell and the second mapping relation; according to the first open-circuit voltage VcCalculating the internal resistance R of the battery cell according to the second open-circuit voltage V and the current discharge current IccWherein R iscc＝(Vc-V)/I. According to the embodiment of the application, the internal resistance of the battery cell is dynamically calculated based on the voltage difference of the battery in the standard discharge state and the actual discharge state and the discharge current during working, so that the accuracy of calculating the internal resistance of the battery cell in the current discharge state of the battery is effectively improved.
According to some embodiments of the application, the first mapping relationship comprises: and discharging the battery cell at a first discharge rate, wherein the discharge current of the battery cell in a standard discharge state is smaller than the discharge current of the battery cell in actual working, a voltage-DOD curve of the battery in the discharge process of the battery cell is obtained, and a first mapping relation between the open-circuit voltage and the discharge depth of the battery cell is obtained according to the voltage-DOD curve of the battery. Some embodiments of the present application determine the standard discharge state as discharging the electrical core at the first discharge rate, which improves the accuracy of the voltage-DOD curve of the battery.
According to some embodiments of the application, the second mapping relationship comprises: discharging the battery cell at a second discharge rate, and acquiring the open-circuit voltage and the battery capacity of the battery cell in the discharging process; and after the electric core finishes discharging, acquiring a second mapping relation between the open-circuit voltage and the discharge depth of the electric core according to the open-circuit voltage and the battery capacity of the electric core in the discharging process. Some embodiments of the present application determine the actual discharge state as discharging the battery cell at the second discharge rate, which improves the accuracy of the second mapping relationship of the battery.
According to some embodiments of the application, the method further comprises: judging whether the state of charge of the battery cell changes or not; and when the state of charge of the battery cell is judged to be changed, calculating the current depth of discharge of the battery cell according to the current state of charge of the battery cell. Some embodiments of the present disclosure recalculate the current depth of discharge of the cell only when the state of charge of the cell changes, avoiding repeated calculations.
According to some embodiments of the present application, the current remaining capacity C and the maximum capacity C of the battery cell are determined according tomaxAnd calculating the current state of charge (SOC) of the battery cell, wherein the SOC is equal to C/Cmax. According to some embodiments of the application, the current state of charge is determined according to the real-time residual capacity of the battery cell, and the real-time performance of the state of charge is ensured.
According to some embodiments of the present application, the calculating the current depth of discharge of the cell from the current state of charge of the cell comprises: determining the initial depth of discharge DOD1 and the final depth of discharge DOD2 of the battery cell in the actual discharge state according to the second mapping relation; and calculating the current depth of discharge DOD of the battery cell according to the starting depth of discharge DOD1, the ending depth of discharge DOD2 and the current state of charge (SOC), wherein DOD is DOD1+ (DOD2-DOD1) SOC. According to some embodiments of the application, the current discharge depth is determined according to the initial discharge depth and the final discharge depth of the battery cell in the actual discharge state, and errors caused by the fact that the actual discharge depth is not consistent with the theoretical discharge depth are avoided.
An embodiment of the present application provides a method for monitoring a state of health of a battery, where the method includes the above method for monitoring an internal resistance of a battery, and further includes: judging the internal resistance R of the battery cellccWhether the current discharge depth is larger than the maximum internal resistance value of the battery cell corresponding to the current discharge depth; determining the internal resistance R of the battery cellccAnd when the internal resistance is larger than the maximum internal resistance value, determining that the battery is abnormal. The embodiment of the application monitors the health state of the battery based on the actual internal resistance of the battery core, and effectively improves the accuracy of monitoring the health state of the battery.
According to some embodiments of the application, the method further comprises: and when the battery is determined to be abnormal, prompting to disable, repair or replace the battery. Some embodiments of the application prompt the user in time when the battery is abnormal, and avoid damage to the electronic equipment caused by abnormal battery.
According to some embodiments of the application, the method further comprises: and obtaining a mapping relation between the capacity retention rate and the cycle number of the plurality of battery cells in a standard discharge state and a mapping relation between the internal resistance and the cycle number, and determining the maximum internal resistance value of the battery cell corresponding to the current discharge depth according to the mapping relation between the capacity retention rate and the cycle number of the plurality of battery cells and the mapping relation between the internal resistance and the cycle number. Some embodiments of the application may determine the internal resistance threshold of the battery cell in a normal state according to the historical parameters of the battery cell, and then determine whether the battery cell is abnormal according to the internal resistance of the current battery cell.
An embodiment of the present application provides an electronic device, which includes a battery and a processor, wherein the processor is configured to execute the battery internal resistance monitoring method or the battery health state monitoring method as described above.
One or more of the above embodiments include the following advantageous effects: the internal resistance of the battery cell is dynamically calculated based on the voltage difference of the battery in the standard discharge state and the actual discharge state and the discharge current in the working process, so that the accuracy of calculating the internal resistance of the battery cell in the current discharge state of the battery is effectively improved, the health state of the battery is monitored based on the internal resistance of the battery cell, and the accuracy of monitoring the health state of the battery is effectively improved.
Drawings
Fig. 1 is a schematic diagram of an electronic device according to an embodiment of the present application.
Fig. 2 is a flowchart of a method for monitoring internal resistance of a battery according to an embodiment of the present disclosure.
Fig. 3 is a flowchart illustrating a first mapping relationship between an open-circuit voltage and a depth of discharge of a battery cell in a standard discharge state according to an embodiment of the present disclosure.
Fig. 4 is a schematic diagram of a first mapping relationship and a second mapping relationship according to an embodiment of the present application.
Fig. 5 is a flowchart illustrating a first mapping relationship between an open-circuit voltage and a depth of discharge of a battery cell in an actual discharge state according to an embodiment of the present application.
Fig. 6 is a flowchart of a battery state of health monitoring method according to an embodiment of the present application.
Fig. 7 is a schematic diagram of a mapping relationship between capacity retention rate and internal resistance and cycle number according to an embodiment of the present application.
Description of the main elements
Electronic device 100
Battery management system 10
Memory 11
Processor 12
Battery 13
Battery cell 131
Collection device 14
Display screen 15
The following detailed description will explain the present application in further detail in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application.
Referring to fig. 1, fig. 1 is a schematic view of an electronic device according to an embodiment of the present disclosure. The electronic device 100 includes, but is not limited to, a Battery Management System (BMS) 10. The battery management system 10 includes, but is not limited to, a memory 11, at least one processor 12, a battery 13, a collection device 14, and a display screen 15, and these elements may be connected via a bus or directly.
It should be noted that fig. 1 is only an example of the electronic device 100 and the battery management system 10. In other embodiments, the electronic device 100 and the battery management system 10 may include more or fewer elements, or have different configurations of elements. The electronic device 100 may be an electric motorcycle, an electric bicycle, an electric automobile, a mobile phone, a tablet computer, a digital assistant, a personal computer, or any other suitable rechargeable device.
In one embodiment, the battery 13 is a rechargeable battery for providing power to the electronic device 100. For example, the battery 13 may be a lead-acid battery, a nickel-cadmium battery, a nickel-metal hydride battery, a lithium ion battery, a lithium polymer battery, a lithium iron phosphate battery, or the like. The battery 13 is connected to a Power Conversion System (PCS) in a communication manner through the battery management System (to perform functions of charging, discharging, and the like), the battery management System 10 may be connected to a Power Conversion System (PCS) through CAN or RS485, the battery 13 includes a battery cell 131, and the battery 13 may be repeatedly charged in a manner of being rechargeable cyclically.
In this embodiment, the collecting device 14 is configured to collect the open-circuit voltage and the discharge current of the battery cell 131 of the battery 13. In this embodiment, the acquisition device 14 is an analog-to-digital converter. It is understood that the collection device 14 may also be other voltage collection devices and current collection devices. The display screen 15 is used for displaying and outputting alarm information. The battery management system 10 may record the discharge time of the battery cells 131 of the battery 13 during the discharge process. It is understood that the battery management system 10 may also include other devices, such as pressure sensors, light sensors, gyroscopes, hygrometers, infrared sensors, etc.
Referring to fig. 2, fig. 2 is a flowchart of a battery internal resistance monitoring method according to an embodiment of the present application. The method for monitoring the internal resistance of the battery is applied to the electronic device 100. The method for monitoring the internal resistance of the battery comprises the following steps:
step S20: a first mapping relationship between the open-circuit voltage and the depth of discharge of the battery cell 131 of the battery 13 in the standard discharge state is obtained.
It should be noted that, when the battery is discharged at a discharge rate not exceeding 0.1C, the initial depth of discharge is 0%, and the final depth of discharge is 100%, and this discharge process is the standard discharge. Referring to fig. 3, in an embodiment, the first mapping relationship includes: step S30, discharging the battery cell 131 at a first discharge rate. The first discharge rate is less than or equal to 0.1C, and the discharge current of the battery cell 131 in the standard discharge state is less than the discharge current of the battery cell 131 during actual operation. Step S31, obtaining a voltage-DOD (depth of discharge) curve of the battery 13 during the standard discharge process of the battery cell 131. Step S32, obtaining a first mapping relationship between the open-circuit voltage and the depth of discharge of the battery cell 131 according to the voltage-DOD curve of the battery cell 131 in the standard discharge process.
Specifically, the discharge current of the battery cell 131 in the standard discharge process is determined according to the first discharge rate, the real-time discharge capacity is calculated according to the product of the discharge current of the battery cell 131 in the standard discharge process and the discharge time recorded by the battery management system 10, and the real-time discharge depth is calculated according to the ratio between the real-time discharge capacity and the rated capacity of the battery 13.
In an embodiment, after the discharge of the battery cell 131 is completed, the battery cell 1 collected by the collecting device 14 is used as the reference31, determining a voltage-DOD curve of the battery cell 131 in the standard charging process according to the real-time open-circuit voltage in the standard discharging process and the calculated real-time depth of discharge, and further determining a corresponding relationship between the open-circuit voltage and the depth of discharge of the battery cell 131 in the standard discharging state, so as to obtain a first mapping relationship between the open-circuit voltage and the depth of discharge of the battery cell 131. For example, if the first discharge rate is 0.1C and the rated capacity of the battery 13 is 2200mA · h, the discharge current I of the battery cell 131 in the standard discharge process is10.1 2200mA 220 mA. If the discharge time is one hour, the discharge capacity C1220mA, 1h, 220mA, h, depth of discharge DOD1＝220mA·h/2200mA·h＝10％。
Referring to fig. 4, in an embodiment, a first mapping relationship between the open-circuit voltage and the depth of discharge of the battery cell 131 in the standard discharge state is represented by a curve, specifically, a dashed line in fig. 3. In other embodiments, the first mapping relationship between the open-circuit voltage and the depth of discharge of the battery cell 131 in the standard discharge state may also be represented by a table or other suitable forms.
In one embodiment, when the battery cell 131 is discharged in the standard discharge state, the battery cell is discharged without the capacity of the battery, the initial depth of discharge is 0%, and the discharge capacity is the maximum capacity of the battery, that is, the final depth of discharge is 100%.
Step S21: and acquiring a second mapping relation between the open-circuit voltage and the discharge depth of the battery cell 131 in an actual discharge state.
Referring to fig. 5, in an embodiment, the second mapping relationship includes: step S40, discharging the battery cell 131 at a second discharge rate. Wherein the second discharge rate is greater than the first discharge rate and less than or equal to a discharge rate threshold. The discharge rate threshold may be a maximum discharge rate specified in the battery specification, such as 1C, 1.5C, etc., and the second discharge rate may be 1C. Step S41, acquiring a voltage-DOD curve of the battery 13 during actual discharging of the battery cell 131. Step S42, obtaining a second mapping relationship between the open-circuit voltage and the depth of discharge of the battery cell 131 according to the voltage-DOD curve of the battery 13 during the actual discharge of the battery cell 131.
Specifically, the real-time open-circuit voltage of the battery cell 131 in the actual discharging process is acquired by the acquisition device 14, the discharging time of the battery cell 131 in the actual discharging process is recorded by the battery management system 10, the discharging current of the battery cell 131 in the actual discharging process is determined according to the second discharging rate, the real-time discharging capacity is calculated according to the product of the discharging time and the discharging current of the battery cell 131 in the actual discharging process, and the real-time discharging depth is calculated according to the ratio between the real-time discharging capacity and the rated capacity of the battery 13.
In an embodiment, after the discharge of the battery cell 131 is completed, a voltage-DOD curve of the battery cell 131 in an actual discharge process is obtained according to the real-time open-circuit voltage and the discharge depth of the battery cell 131 in the actual discharge process, which are collected by the collecting device 14, and a corresponding relationship between the open-circuit voltage and the discharge depth of the battery cell 131 in an actual discharge state is determined according to the voltage-DOD curve of the battery cell 131 in the actual discharge process, so as to obtain a second mapping relationship between the open-circuit voltage and the discharge depth of the battery cell 131.
In an embodiment, the second mapping relationship between the open-circuit voltage and the depth of discharge of the battery cell 131 in the actual discharge state is represented by a curve, specifically, a solid line in fig. 3. In other embodiments, the second mapping relationship between the open-circuit voltage and the depth of discharge of the battery cell 131 in the actual discharge state may also be represented by a table or other suitable forms.
Step S22: during the operation of the battery 13, the state of charge of the battery cell 131 is monitored in real time.
In one embodiment, the current remaining capacity C and the maximum capacity C of the battery cell 131 are determined according to the current remaining capacity C and the maximum capacity CmaxCalculating the current state Of charge SOC (State Of Charge). Wherein, the maximum capacity CmaxThe SOC is the rated capacity of the battery 13, and is C/Cmax. The current remaining capacity C is the maximumCapacity CmaxAnd the difference between the discharge capacities. The method for calculating the discharge capacity of the battery 13 during operation is the same as the above-described method for calculating the discharge capacity.
Step S23: calculating the current depth of discharge of the cell 131 according to the current state of charge of the cell 131.
In an embodiment, the starting depth of discharge DOD1 and the ending depth of discharge DOD2 of the battery cell 131 in the actual discharge state are determined according to the second mapping relationship. It should be noted that, during the actual operation of the battery 13, because there is attenuation in the battery capacity, the initial discharge depth is usually not zero, and the final discharge depth is not 100% for the safety of the battery.
In an embodiment, the current depth of discharge DOD of the battery cell 131 is calculated according to the starting depth of discharge DOD1, the ending depth of discharge DOD2 and the current state of charge SOC. Among them, DOD1+ (DOD2-DOD1) · SOC.
In one embodiment, the method for monitoring internal resistance of battery further comprises, between step S22 and step S23: it is determined whether a change occurs in the state of charge of the battery cells 131. Specifically, whether the current state of charge of the battery cell 131 is the same as the last state of charge of the battery cell 131 is determined. Determining that the state of charge of the cell 131 has not changed when it is determined that the currently monitored state of charge of the cell 131 is the same as the last monitored state of charge of the cell 131. When it is determined that the currently monitored state of charge of the cell 131 is different from the last monitored state of charge of the cell 131, it is determined that the state of charge of the cell 131 is changed. At this time, step S23 includes: when it is determined that the state of charge of the battery cell 131 changes, the current depth of discharge of the battery cell 131 is calculated according to the current state of charge of the battery cell 131. In this way, the state of charge of the battery 13 is dynamically monitored in real time, and when the state of charge of the battery 13 changes, the current depth of discharge DOD of the battery cell 131 is recalculated, so as to avoid repeated operation.
Step S24: according to the current discharge depth of the battery cell 131 and the first mapping relation, determiningConstant first open circuit voltage VcAnd determining a second open-circuit voltage V according to the current discharge depth of the battery cell 131 and the second mapping relationship.
In an embodiment, the first open-circuit voltage V corresponding to the current depth of discharge DOD is determined according to a corresponding relationship between the open-circuit voltage and the depth of discharge of the battery cell 131 in a standard discharge statecAnd determining a second open-circuit voltage V corresponding to the current depth of discharge DOD according to a corresponding relationship between the open-circuit voltage and the depth of discharge of the battery cell 131 in an actual discharge state.
Step S25: according to the first open-circuit voltage VcCalculating the internal resistance R of the battery cell 131 by the second open-circuit voltage V and the current discharge current Icc。
In one embodiment, Rcc＝(Vc-V)/I. Wherein the current discharge current I is determined by the power of the consumer using the battery 13.
Referring to fig. 6, fig. 6 is a flowchart illustrating a battery health status monitoring method according to an embodiment of the present application. The battery health state monitoring method is applied to the electronic device 100.
Steps S61 to S65 of the battery state of health monitoring method are the same as steps S21 to S25 of the battery internal resistance monitoring method.
Step S66: judging the internal resistance R of the battery cell 131ccWhether the internal resistance is greater than the maximum internal resistance of the battery cell 131 corresponding to the current depth of discharge.
Step S67: when it is determined that the internal resistance of the battery cell 131 is greater than the maximum internal resistance value, it is determined that the battery 13 is abnormal.
Step S68: when it is determined that the internal resistance of the battery cell 131 is less than or equal to the maximum internal resistance value, it is determined that the battery 13 is in a healthy state.
In one embodiment, the battery state of health monitoring method further includes, after step S67: and when the battery 13 is determined to be abnormal, outputting alarm information. Specifically, when it is determined that the battery 13 is abnormal, the display screen 15 displays the alarm information, which may be a text "battery abnormal". In other embodiments, when it is determined that the battery 13 is abnormal, the alarm information may be output by a speaker (not shown) outputting a voice, or output by an indicator lamp (not shown) flashing a light, or send the alarm information to a mobile terminal of a battery maintenance person, such as a mobile phone.
In one embodiment, the battery state of health monitoring method further includes, after step S67: and when the battery 13 is determined to be abnormal, prompting to disable, repair or replace the battery.
Specifically, when it is determined that the battery 13 is abnormal, whether the battery 13 has a safety problem is determined according to a detection result of the battery cell 131 by a detection device (not shown), and when it is determined that the battery 13 has a safety problem, disabling, repairing or replacing the battery is prompted. When it is determined that the battery 13 is abnormal, and a maintenance worker receives the alarm information, the failure analysis may be performed on the battery cell 131 through the manual work and the detection device, for example, whether the battery cell 131 has internal short circuit between positive and negative electrodes, liquid leakage, flatulence and swelling, poor capacity consistency, capacity diving, and other faults is analyzed. When the detection result of the detection device for the battery cell 131 indicates that at least one fault exists in the battery cell 131, it is determined that a safety problem exists in the battery 13. When the detection result of the detection device on the battery cell 131 indicates that the battery cell 131 does not have any of the above faults, it is determined that the battery 13 does not have a safety problem. When it is determined that there is no safety problem with the battery 13, it is suggested that the battery 13 can continue to operate normally.
In one embodiment, when it is determined that there is a safety problem with the battery 13, disabling, repairing, or replacing the battery 13 is prompted. Specifically, when it is determined that there is a safety problem in the battery 13, it is determined whether the battery 13 is within a quality guarantee period. And when the battery 13 is judged to be within the quality guarantee period, prompting a maintenance worker to disable the battery 13 and maintain or replace the battery 13. When it is determined that the battery 13 is not within the warranty period, a serviceman is prompted to disable only the battery 13.
In one embodiment, the battery state of health monitoring method further comprises: acquiring a mapping relation between capacity retention rate and cycle number and a mapping relation between internal resistance and cycle number of the plurality of battery cells 131 in a healthy state, and determining the maximum internal resistance value of the battery cell 131 corresponding to the current depth of discharge DOD according to the mapping relation between the capacity retention rate and cycle number of the battery cell 131 and the mapping relation between the internal resistance and cycle number. Wherein the capacity retention rate is a maximum depth of discharge of the battery cells 131 at each cycle number, and the specifications of the battery cells 131 are the same. In other embodiments, the maximum internal resistance value may be a preset value.
Referring to fig. 7, specifically, the corresponding relationship between the capacity retention rate and the cycle count of the plurality of battery cells 131 in the healthy state and the corresponding relationship between the internal resistance and the cycle count are obtained from the cloud big data or the historical data, and the mapping relationship between the capacity retention rate and the cycle count and the mapping relationship between the internal resistance and the cycle count are obtained. And determining the corresponding relation between the capacity retention rate and the internal resistance according to the mapping relation between the capacity retention rate and the cycle times and the mapping relation between the internal resistance and the cycle times. As shown in fig. 7, each capacity retention rate of the battery cells 131 corresponds to an internal resistance value, and the internal resistance values corresponding to the same capacity retention rate of different battery cells 131 are different. Determining internal resistance values corresponding to capacity retention rates of different battery cells 131 equal to the current discharge depth, determining a plurality of internal resistance values due to different internal resistance values corresponding to the same capacity retention rates of different battery cells 131, determining a maximum value of the plurality of internal resistances, and determining the maximum value of the plurality of internal resistances as the maximum value of the internal resistance of the battery cell 131. Thus, the internal resistance R of the battery cell 131 can be judgedccWhether or not the resistance of the cell 131 is greater than the maximum value of the resistance of the cell 131 determines whether or not the cell 131 is in a healthy state.
Referring to fig. 1, in the present embodiment, the memory 11 may be an internal memory of a battery management system, that is, a memory built in the electronic device. In other embodiments, the memory 11 may also be an external memory of the electronic device, i.e. a memory externally connected to the electronic device.
In some embodiments, the memory 11 is used for storing program codes and various data, and realizes high-speed and automatic access to programs or data during the operation of the electronic device.
The memory 11 may include random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
In one embodiment, the Processor 12 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor may be any other conventional processor or the like.
The program code and various data in the memory 11 may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as separate products. Based on such understanding, all or part of the processes in the methods of the embodiments described above, for example, the steps in the battery internal resistance monitoring method and the battery health status monitoring method, may also be implemented by a computer program that can be stored in a computer-readable storage medium and instructs related hardware to implement the steps in the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, U disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), or the like.
It is understood that the above described module division is a logical function division, and there may be other division ways in actual implementation. In addition, functional modules in the embodiments of the present application may be integrated into the same processing unit, or each module may exist alone physically, or two or more modules are integrated into the same unit. The integrated module can be realized in a hardware form, and can also be realized in a form of hardware and a software functional module.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.

Claims (10)

1. A method for monitoring internal resistance of a battery, the method comprising:
acquiring a first mapping relation between the open-circuit voltage and the discharge depth of a battery cell in a standard discharge state;
acquiring a second mapping relation between the open-circuit voltage and the discharge depth of the battery cell in an actual discharge state;
calculating the current depth of discharge of the battery cell according to the current state of charge of the battery cell;
determining a first open-circuit voltage V according to the current discharge depth of the battery cell and the first mapping relationc；
Determining a second open-circuit voltage V according to the current discharge depth of the battery cell and the second mapping relation;
according to the first open-circuit voltage VcCalculating the internal resistance R of the battery cell according to the second open-circuit voltage V and the current discharge current IccWherein R iscc＝(Vc-V)/I。
2. The battery internal resistance monitoring method according to claim 1, wherein the first mapping relationship includes:
discharging the battery cell at a first discharge rate, wherein the discharge current of the battery cell in a standard discharge state is smaller than the discharge current of the battery cell in actual operation;
acquiring a voltage-DOD curve of the battery in the battery cell discharging process;
and acquiring a first mapping relation between the open-circuit voltage and the discharge depth of the battery cell according to the voltage-DOD curve of the battery.
3. The battery internal resistance monitoring method according to claim 1, wherein the second mapping relationship includes:
discharging the battery cell at a second discharge rate, and acquiring the open-circuit voltage and the battery capacity of the battery cell in the discharging process;
and after the electric core finishes discharging, acquiring a second mapping relation between the open-circuit voltage and the discharge depth of the electric core according to the open-circuit voltage and the battery capacity of the electric core in the discharging process.
4. The method of monitoring the internal resistance of a battery according to claim 1, further comprising:
judging whether the state of charge of the battery cell changes or not;
and when the change of the state of charge of the battery cell is determined, calculating the current depth of discharge of the battery cell according to the current state of charge of the battery cell.
5. The battery internal resistance monitoring method of claim 1 or 4, characterized in that according to the current remaining capacity C and the maximum capacity C of the battery cellmaxAnd calculating the current state of charge (SOC) of the battery cell, wherein the SOC is equal to C/Cmax。
6. The battery internal resistance monitoring method of claim 5, wherein the calculating the current depth of discharge of the cell from the current state of charge of the cell comprises: determining the initial depth of discharge DOD1 and the final depth of discharge DOD2 of the battery cell in the actual discharge state according to the second mapping relation; and calculating the current depth of discharge DOD of the battery cell according to the starting depth of discharge DOD1, the ending depth of discharge DOD2 and the current state of charge (SOC), wherein DOD is DOD1+ (DOD2-DOD1) SOC.
7. A battery state of health monitoring method, characterized in that the method comprises any of claims 1 to 6, further comprising:
judging the internal resistance R of the battery cellccWhether the current discharge depth is larger than the maximum internal resistance value of the battery cell corresponding to the current discharge depth;
determining the internal resistance R of the battery cellccAnd when the internal resistance is larger than the maximum internal resistance value, determining that the battery is abnormal.
8. The battery state of health monitoring method of claim 7, further comprising:
and when the abnormity of the battery is determined, prompting to disable, repair or replace the battery.
9. The battery state of health monitoring method of claim 7, further comprising:
acquiring a mapping relation between capacity retention rate and cycle number and a mapping relation between internal resistance and cycle number of a plurality of battery cells in a healthy state;
and determining the maximum internal resistance value of the battery cell corresponding to the current discharge depth according to the mapping relation between the capacity retention rate and the cycle number of the battery cells and the mapping relation between the internal resistance and the cycle number.
10. An electronic device, comprising:
a battery; and
a processor for performing the battery internal resistance monitoring method according to any one of claims 1 to 6 or the battery state of health monitoring method according to any one of claims 7 to 9.
CN202110662730.8A 2021-06-15 2021-06-15 Battery internal resistance and health state monitoring method and electronic device Pending CN113391228A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115656845A (en) * 2022-10-27 2023-01-31 拓尔微电子股份有限公司 Battery electric quantity calculation method and device, terminal and storage medium

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109061518A (en) * 2018-10-18 2018-12-21 国家电网有限公司 A kind of communication storage battery health degree on-line monitoring method
CN109856559A (en) * 2019-02-28 2019-06-07 武汉理工大学 A kind of prediction technique of lithium battery cycle life
CN110398693A (en) * 2019-07-29 2019-11-01 国网河南省电力公司电力科学研究院 A kind of retired LiFePO4 single battery state fast appraisement method
CN110568373A (en) * 2019-07-29 2019-12-13 深圳市科陆电子科技股份有限公司 Lithium battery health state evaluation method, system, terminal and storage medium
CN111157907A (en) * 2019-12-30 2020-05-15 Oppo广东移动通信有限公司 Detection method and device, charging method and device, electronic device and storage medium
CN112485686A (en) * 2019-09-12 2021-03-12 东莞新能德科技有限公司 Method for determining battery impedance, electronic device and computer readable storage medium
CN112858931A (en) * 2021-02-01 2021-05-28 重庆峘能电动车科技有限公司 Battery cell health monitoring method, terminal equipment and system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109061518A (en) * 2018-10-18 2018-12-21 国家电网有限公司 A kind of communication storage battery health degree on-line monitoring method
CN109856559A (en) * 2019-02-28 2019-06-07 武汉理工大学 A kind of prediction technique of lithium battery cycle life
CN110398693A (en) * 2019-07-29 2019-11-01 国网河南省电力公司电力科学研究院 A kind of retired LiFePO4 single battery state fast appraisement method
CN110568373A (en) * 2019-07-29 2019-12-13 深圳市科陆电子科技股份有限公司 Lithium battery health state evaluation method, system, terminal and storage medium
CN112485686A (en) * 2019-09-12 2021-03-12 东莞新能德科技有限公司 Method for determining battery impedance, electronic device and computer readable storage medium
CN111157907A (en) * 2019-12-30 2020-05-15 Oppo广东移动通信有限公司 Detection method and device, charging method and device, electronic device and storage medium
CN112858931A (en) * 2021-02-01 2021-05-28 重庆峘能电动车科技有限公司 Battery cell health monitoring method, terminal equipment and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115656845A (en) * 2022-10-27 2023-01-31 拓尔微电子股份有限公司 Battery electric quantity calculation method and device, terminal and storage medium
CN115656845B (en) * 2022-10-27 2023-11-14 拓尔微电子股份有限公司 Method, device, terminal and storage medium for calculating battery electric quantity

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Application publication date: 20210914