CN111834675B - Battery charging/discharging management method, electronic device, and storage medium - Google Patents

Battery charging/discharging management method, electronic device, and storage medium Download PDF

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Publication number
CN111834675B
CN111834675B CN201910300917.6A CN201910300917A CN111834675B CN 111834675 B CN111834675 B CN 111834675B CN 201910300917 A CN201910300917 A CN 201910300917A CN 111834675 B CN111834675 B CN 111834675B
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battery
charge
threshold value
charging
protection range
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CN111834675A (en
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钟弟
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Dongguan Poweramp Technology Ltd
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Dongguan Poweramp Technology Ltd
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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44Methods for charging or discharging
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44Methods for charging or discharging
    • H01M10/443Methods for charging or discharging in response to temperature
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

The application provides a battery charging and discharging management method, which comprises the following steps: acquiring characteristic parameters of a battery; determining the protection range according to the corresponding relation between the characteristic parameters and the protection range; collecting a voltage value of a battery; and judging whether the voltage value of the battery is within the protection range, and judging whether to perform turn-off control on the charging loop and the discharging loop. The application also provides an electronic device and a storage medium. According to the battery charging and discharging management method, the electronic device and the storage medium, charging and discharging protection can be performed on the battery, and the service life and reliability of the battery are improved.

Description

Battery charging/discharging management method, electronic device, and storage medium
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a battery charging/discharging management method, an electronic device, and a storage medium.
Background
At present, the lithium ion battery pack has the advantages of high energy density, high power density, multiple recycling times, long storage time and the like, and has wide application prospects in the aspects of large and medium-sized electric equipment such as electric vehicles and energy storage facilities, so the lithium ion battery pack becomes a key for solving global problems such as energy crisis, environmental pollution and the like.
In a Battery Management System (BMS) provided in an existing battery pack, an overvoltage protection value and an undervoltage protection value, which are set in association with a battery charge and discharge interval, are fixed values. In this case, as the number of charging cycles and the usage time increase, the available capacity of the battery pack may be greatly deteriorated, thereby resulting in a reduction in the actual life span of the battery pack.
Disclosure of Invention
In view of the above, it is desirable to provide a battery charging/discharging management method, an electronic device and a storage medium, which can protect the battery from charging/discharging and improve the service life and reliability of the battery.
An embodiment of the present application provides a battery charge and discharge management method, including:
acquiring characteristic parameters of a battery;
determining the protection range according to the corresponding relation between the characteristic parameters and the protection range;
collecting a voltage value of a battery; and
and judging whether the voltage value of the battery is within the protection range, and judging whether to perform turn-off control on the charging loop and the discharging loop.
According to some embodiments of the present application, the protection range includes an overvoltage protection range and an undervoltage protection range.
According to some embodiments of the present application, the characteristic parameters include a length of time of use, a number of charge and discharge cycles, and a cell temperature of the battery.
According to some embodiments of the present application, the determining whether the voltage value of the battery is within the protection range and determining whether to perform turn-off control on the charging loop and the discharging loop specifically includes:
in the charging process, judging whether the maximum value of the voltage value of the battery is within the overvoltage protection range or not; and
and when the maximum value of the voltage value of the battery is not in the overvoltage protection range, performing turn-off control on the charging loop.
According to some embodiments of the present application, the step of determining whether the voltage value of the battery is within the protection range and determining whether to perform turn-off control on the charging loop and the discharging loop specifically further includes:
in the discharging process, judging whether the minimum value of the voltage value of the battery is in the undervoltage protection range or not; and
and when the minimum value of the voltage value of the battery is not in the under-voltage protection range, performing turn-off control on the discharge loop.
According to some embodiments of the present application, the battery charge and discharge management method further comprises:
acquiring an impedance value of the battery according to the service life or the charge-discharge cycle number of the battery;
and determining the corresponding relation between the overvoltage protection threshold value and the undervoltage protection threshold value and the service life or the charging and discharging cycle number of the battery according to the impedance value of the battery.
According to some embodiments of the present application, the battery charge and discharge management method further comprises:
acquiring the cell temperature of the battery;
judging whether the cell temperature of the battery is in a first range;
when the core temperature of the battery is in the first range, improving the overvoltage protection threshold value according to the corresponding relation between the overvoltage protection threshold value and the service life or the charging and discharging cycle times of the battery; and
and when the cell temperature of the battery is in the first range, reducing the undervoltage protection threshold value according to the corresponding relation between the undervoltage protection threshold value and the service life or the charging and discharging cycle number of the battery.
According to some embodiments of the present application, the battery charge and discharge management method further comprises:
acquiring the cell temperature of the battery;
judging whether the cell temperature of the battery is in a second range;
when the core temperature of the battery is in the second range, reducing the overvoltage protection threshold value according to the corresponding relation between the overvoltage protection threshold value and the service life or the charging and discharging cycle times of the battery; and
and when the cell temperature of the battery is in the second range, improving the undervoltage protection threshold value according to the corresponding relation between the undervoltage protection threshold value and the service life or the charging and discharging cycle times of the battery.
An embodiment of the present application provides an electronic device, including:
a battery;
a processor; and
a memory in which a plurality of program modules are stored, the program modules being loaded by the processor and executing the battery charge and discharge management method as described above to manage the charge and discharge of the battery.
An embodiment of the present application provides a storage medium, on which at least one computer instruction is stored, where the instruction is loaded by a processor to execute the battery charging and discharging management method as described above.
According to the battery charging and discharging management method, the electronic device and the storage medium, the protection range is determined by obtaining the characteristic parameters of the battery and according to the corresponding relation between the characteristic parameters and the protection range, the voltage value of the battery is collected, whether the voltage value of the battery is in the protection range is judged, and whether the charging loop and the discharging loop are controlled to be turned off or not is judged. In this way, the battery charge and discharge management method, the electronic device, and the storage medium according to the embodiments of the present application can protect the charge and discharge of the battery, thereby improving the service life and reliability of the battery.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Fig. 2 is a flowchart of a battery charge and discharge management method according to an embodiment of the present application.
Fig. 3 is a flowchart of a battery charge and discharge management method according to another embodiment of the present application.
Fig. 4 is a curve diagram illustrating a charge-discharge interval of a battery during a charge or discharge process.
Fig. 5 is a schematic diagram illustrating a cell temperature of a battery in stages.
Fig. 6 is an enlarged view of the VI portion of the variation curve of the overvoltage protection threshold value in fig. 4.
Fig. 7 is an enlarged diagram of a VII portion of a variation curve of the undervoltage protection threshold in fig. 4.
Fig. 8 is a block diagram of a battery charge and discharge management system according to an embodiment of the present application.
Description of the main elements
Electronic device 100
Battery charge and discharge management system 10
Memory 11
Processor 12
Battery 13
Sensor 14
Acquisition module 101
Acquisition module 102
Determination module 103
Control module 104
The following detailed description will further illustrate the present application 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.
All other embodiments that can be obtained by a person skilled in the art without inventive step based on the embodiments in this application are within the scope of protection of this application.
Referring to fig. 1, a battery charging/discharging management system 10 operates in an electronic device 100. The electronic device 100 includes, but is not limited to, a memory 11, at least one processor 12, a battery 13, and a sensor 14, and the above 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. In other embodiments, electronic device 100 may include more or fewer elements, or have a different configuration 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 logically connected to the processor 12 through a Battery Management System (BMS), so that functions such as charging, discharging, and power consumption management are implemented through the battery management system. The battery management system CAN be in communication connection with a power storage inverter (PCS) through CAN or RS 485. The battery 13 includes a cell (not shown).
In the present embodiment, the sensor 14 is used to measure the temperature of the battery cell 13 during charging or discharging. In one embodiment, the sensor 14 may be a Negative Temperature system (NTC) thermistor. It is understood that the electronic device 100 may also include other sensors, such as pressure sensors, light sensors, gyroscopes, hygrometers, infrared sensors, and the like.
Referring to fig. 2, fig. 2 is a flowchart illustrating a battery charging/discharging management method according to an embodiment of the present disclosure. The battery charge and discharge management method may include the steps of:
step S21, obtaining characteristic parameters of the battery 13.
In the present embodiment, the characteristic parameters of the battery 13 may include a service life of the battery 13, a number of charge and discharge cycles of the battery 13, and a cell temperature of the battery 13.
Specifically, the battery charge and discharge management system 10 obtains the cell temperature T of the battery 13 through the sensor 14. The battery charge and discharge management system 10 may obtain the number of charge and discharge cycles of the battery 13 through a counting unit (not shown). Further, the battery charge and discharge management system 10 may also obtain the usage duration of the battery 13 through a timing unit (not shown).
In the present embodiment, the battery charge/discharge management system 10 may acquire the characteristic parameters of the battery 13 in real time or at preset time intervals. Preferably, the preset time interval may be ten seconds, or may be other times, and may be determined according to specific requirements.
Step S22, determining the protection range according to the corresponding relationship between the characteristic parameters of the battery 13 and the protection range.
In one embodiment, the protection range may include an over-voltage protection range and an under-voltage protection range.
In one embodiment, the correspondence between the characteristic parameter and the protection range describes: when the battery 13 is charged or discharged, acquiring the cell temperature of the battery 13, the number of charge-discharge cycles of the battery 13 and the service life of the battery 13; and according to the cell temperature of the battery 13, the charging and discharging cycle number of the battery 13 and the service life of the battery 13, establishing a mapping relation between the battery and the overvoltage protection range and the undervoltage protection range in advance.
Step S23, collecting the voltage value of the battery 13.
In an embodiment, the battery charge and discharge management system 10 collects voltages of all the unit cells of the battery 13, and calculates a maximum value and a minimum value of the voltages of all the unit cells.
Step S24, determining whether the voltage value of the battery 13 is within the protection range, and determining whether to perform shutdown control on the charging circuit and the discharging circuit.
Specifically, during the charging process of the battery 13, the battery charging and discharging management system 10 will determine whether the maximum value of the voltage value of the battery 13 is within the overvoltage protection range, and if the maximum value of the voltage value of the battery 13 is not within the overvoltage protection range, the battery charging and discharging management system 10 will perform turn-off control on the charging loop, otherwise, the charging loop may be continuously maintained to be turned on.
In the discharging process of the battery 13, the battery charging and discharging management system 10 will determine whether the minimum value of the voltage value of the battery 13 is within the under-voltage protection range, if the minimum value of the voltage value of the battery 13 is not within the under-voltage protection range, the battery charging and discharging management system 10 will perform turn-off control on the discharging loop, otherwise, the turning-on of the discharging loop can be continuously maintained.
Referring to fig. 3, the battery charging and discharging management system 10 may determine the protection range according to the corresponding relationship between the characteristic parameter of the battery 13 and the protection range by the following steps:
step S31, obtaining the impedance value of the battery 13 according to the usage duration or the number of charge and discharge cycles of the battery 13.
In one embodiment, the impedance value of the battery 13 tends to increase gradually as the service time or the number of charge and discharge cycles of the battery 13 increases, and the impedance value of the battery has a direct correlation with the aging degradation of the battery core. Thus, the battery charge and discharge management system 10 can obtain the impedance value of the battery 13 by obtaining the usage time or the number of charge and discharge cycles of the battery 13.
Step S32, determining a corresponding relationship between the overvoltage protection threshold and the undervoltage protection threshold and the usage duration or the number of charge and discharge cycles of the battery according to the impedance value of the battery 13.
Specifically, the battery charge and discharge management system 10 may establish a main curve of changes of the overvoltage protection threshold value and the undervoltage protection threshold value under different use durations or charge and discharge cycle times according to the impedance value of the battery 13.
Referring to fig. 4, a schematic diagram of a charge/discharge interval of the battery 13 during a charging or discharging process is shown. As can be seen from fig. 4, the variation curve C41 of the overvoltage protection threshold value has a trend that the initial overvoltage threshold value gradually decreases with the increase of the impedance value of the battery 13, and the impedance value of the battery 13 gradually increases with the increase of the usage time or the number of charge and discharge cycles. Thus, the trend of the main curve of the variation of the overvoltage protection threshold value gradually decreases with the increase of the service life of the battery 13 or the number of charge and discharge cycles. As can be seen from the curve C41 of the overvoltage protection threshold value, the charging interval of the battery 13 gradually decreases as the usage duration or the number of charge/discharge cycles of the battery increases. According to the characteristics of the lithium ion battery, the charging interval of the battery 13 is reduced, so that the service life or the chargeable times of the battery 13 can be increased.
The trend of the variation curve C42 of the under-voltage protection threshold value is that the initial under-voltage threshold value gradually increases with the increase of the impedance value of the battery 13, and the impedance value of the battery 13 gradually increases with the increase of the usage duration or the number of charge and discharge cycles. Thus, the trend of the curve C42 of the undervoltage protection threshold value change is gradually increased as the usage time period or the number of charge and discharge cycles of the battery 13 is increased. As can be known from the main curve of the variation of the undervoltage protection threshold, the discharge interval of the battery 13 gradually increases with the use duration of the battery or the increase of the number of charge and discharge cycles. According to the characteristics of the lithium ion battery, reducing the discharge interval of the battery 13 can increase the service life or the dischargeable times of the battery 13.
For example, referring to fig. 6 and fig. 7 together, the over-voltage protection threshold is denoted as Vth _ ov, and the under-voltage protection threshold is denoted as Vth _ uv.
The main curve C61 of the overvoltage protection threshold value Vth _ ov satisfies the following formula:
Vth_ov=Vth_ov(0)-kb*Rcc (1)
the main curve C71 of the undervoltage protection threshold value Vth _ uv satisfies the formula:
Vth_uv=Vth_uv(0)+ka*Rcc (2)
wherein Vth _ ov (0) is an initial overvoltage threshold value of Vth _ ov, Vth _ uv (0) is an initial undervoltage threshold value of Vth _ uv, Rcc is an impedance value of the battery, kb is a proportionality coefficient of a rise of the overvoltage protection threshold value Vth _ ov voltage, and ka is a proportionality coefficient of a fall of the undervoltage protection threshold value Vth _ uv voltage. Namely, the overvoltage protection threshold value Vth _ ov performs amplitude reduction linearly related to the impedance value on the basis of the initial overvoltage threshold value, and the undervoltage protection threshold value Vth _ uv performs amplitude enhancement linearly related to the impedance value on the basis of the initial undervoltage threshold value, so that it can be known that as the service time T of the battery or the number Cycle of charge and discharge cycles increases, the main curve C61 of the overvoltage protection threshold value Vth _ ov gradually decreases, and the main curve C71 of the undervoltage protection threshold value Vth _ uv gradually increases.
In this embodiment, values of ka and kb depend on the rate requirement of the charge and discharge interval, and the larger values of ka and kb are, the faster the convergence tendency of the undervoltage protection threshold value Vth _ uv and the overvoltage protection threshold value Vth _ ov becomes. The smaller the values of ka and kb are, the slower the convergence trend of the undervoltage protection threshold value Vth _ uv and the overvoltage protection threshold value Vth _ ov is.
Step S33, acquiring the cell temperature of the battery 13.
In one embodiment, the cell temperature of the battery 13 is obtained by the sensor 14.
Step S34, determining whether the cell temperature of the battery 13 is within a first range. If so, the process proceeds to step S35, otherwise, the process proceeds to step S36.
Referring to fig. 5, according to the temperature characteristic of the battery cell, the battery cell temperature may be segmented, for example, three key temperature points are set for the battery cell temperature: tu, Ts, To. Wherein the critical temperature point Tu is a boundary point between proper temperature and low temperature, the critical temperature point To is a boundary point between proper temperature and high temperature, and the critical temperature point Ts is a most proper temperature.
In the present embodiment, the first range is a temperature range between the critical temperature point Tu and the critical temperature point To.
The value ranges of Tu, Ts, To can be adjusted according To different cell specifications. In this embodiment, the critical temperature point To may have a range between 35 ℃ and 45 ℃, the critical temperature point Tu may have a range between 0 ℃ and 15 ℃, and the critical temperature point Ts may have a range between 15 ℃ and 35 ℃.
Step S35, according to the corresponding relation between the overvoltage protection threshold value and the service life or the charging and discharging cycle times of the battery, the overvoltage protection threshold value is increased; and reducing the undervoltage protection threshold value according to the corresponding relation between the undervoltage protection threshold value and the service life or the charging and discharging cycle times of the battery.
As shown in fig. 6 and fig. 7, it can be seen that the real-time curve C62 of the over-voltage protection threshold value Vth _ ov is influenced by the real-time temperature to generate a certain curve fluctuation on the basis of the main curve C61 of the over-voltage protection threshold value Vth _ ov, and the real-time curve C72 of the under-voltage protection threshold value Vth _ uv is influenced by the real-time temperature to generate a certain curve fluctuation on the basis of the main curve C71 of the under-voltage protection threshold value Vth _ uv.
In an embodiment, when the cell temperature of the battery 13 is in the first range, the charging and discharging interval is appropriately increased around the overvoltage protection threshold value Vth _ ov main curve C61 and the undervoltage protection threshold value Vth _ uv main curve C71.
For example, when the cell temperature of the battery 13 is in the first range, that is, when the cell temperature of the battery 13 is between the critical temperature point Tu and the critical temperature point To, the charge-discharge interval of the battery 13 is widened.
The actual curve C62 of the over-voltage protection threshold Vth _ ov at this time will satisfy the following equation:
vth _ ov ═ Vth _ ov main curve + za × MIN (| Temp-Tu |, | To-Temp |) (3)
It follows that the actual curve C72 for the under-voltage protection threshold Vth _ uv will satisfy the formula:
vth _ uv ═ Vth _ uv main curve-zb × MIN (| Temp-Tu |, | To-Temp |) (4)
Where Temp is the cell temperature of the battery 13, MIN represents the minimum value of the numbers in parentheses, and za and zb are unit conversion linear proportionality coefficients for converting the temperature difference into a voltage value.
Therefore, when the cell temperature of the battery 13 is in the first range, the overvoltage protection threshold value may be increased on the basis of the overvoltage protection threshold value Vth _ ov main curve to obtain an upper limit curve C63 of the overvoltage protection threshold value Vth _ ov, and the undervoltage protection threshold value may be decreased on the basis of the undervoltage protection threshold value Vth _ uv main curve to obtain a lower limit curve C74 of the undervoltage protection threshold value Vth _ uv.
Step S36, reducing the overvoltage protection threshold value according to the corresponding relation between the overvoltage protection threshold value and the service life or the charging and discharging cycle times of the battery; and increasing the undervoltage protection threshold value according to the corresponding relation between the undervoltage protection threshold value and the service life or the charging and discharging cycle times of the battery.
In an embodiment, when the cell temperature of the battery 13 is in the second range, the charging and discharging interval is appropriately adjusted around the overvoltage protection threshold value Vth _ ov main curve and the undervoltage protection threshold value Vth _ uv, so as to further extend the charging and discharging cycle number or the service time of the battery or the battery pack.
For example, when the cell temperature of the battery 13 is in the second range, that is, the cell temperature of the battery 13 is less than or equal To the critical temperature point Tu, or the cell temperature of the battery 13 is greater than the critical temperature point To, the charge and discharge interval of the battery 13 is narrowed.
The actual curve of the overvoltage protection threshold value Vth _ ov at this time will satisfy the following equation:
vth _ ov ═ Vth _ ov main curve-zc × MAX (| Tu-Temp |, | To-Temp |) (5)
The actual curve of the undervoltage protection threshold value Vth _ uv will thus satisfy the formula:
vth _ uv ═ Vth _ uv main curve + zd × (i Tu-Temp |, | To-Temp |) (6)
Where, MAX represents the maximum value of the number in parentheses, and zc and zd are units to convert the linear proportionality coefficient for converting the temperature difference into the voltage value. The values of ka, kb, za, zb, zc, and zd can be determined by the following method: and carrying out a charge-discharge interval circulation experiment on the battery cell under a plurality of groups of conditions with different temperatures and different Rcc to obtain a plurality of groups of charge-discharge interval management curves, wherein ka, kb, za, zb, zc and zd can be taken from ka, kb, za, zb, zc and zd in the charge-discharge interval management curves when the charge-discharge cycle times of the battery cell in the experiment reach maximum values.
Thus, when the cell temperature of the battery 13 is in the second range, the overvoltage protection threshold value may be decreased on the basis of the main overvoltage protection threshold value Vth _ ov curve to obtain a lower limit curve C64 of the overvoltage protection threshold value Vth _ ov and increased on the basis of the main undervoltage protection threshold value Vth _ uv curve to obtain an upper limit curve C73 of the undervoltage protection threshold value Vth _ uv.
Specifically, a plurality of groups of experimental data can be obtained by performing a charge-discharge interval Cycle experiment on the battery cell under the conditions of a plurality of groups of different temperatures Temp, different charge-discharge Cycle times Cycle and different impedances Rcc.
For example, when the Cycle number of charge and discharge cycles is 0 and the resistance Rcc is 5m Ω, if the temperature Temp of the cell is-10 ℃, the lower limit of Vth _ ov is 3.62V and the upper limit of Vth _ uv is 2.92V. If the temperature Temp of the battery cell is 25 deg.c, the upper limit value of Vth _ ov is 3.65V and the lower limit value of Vth _ uv is 2.90V. If the temperature Temp of the battery cell is 45 deg.c, the lower limit of Vth _ ov can be 3.63V and the upper limit of Vth _ uv can be 2.93V.
When the Cycle number of charge and discharge cycles is 500 and the resistance Rcc is 8m Ω, if the temperature Temp of the cell is-10 ℃, the lower limit of Vth _ ov is 3.61V and the upper limit of Vth _ uv is 2.91V. If the temperature Temp of the battery cell is 25 deg.c, the upper limit value of Vth _ ov is 3.63V and the lower limit value of Vth _ uv is 2.90V. If the temperature Temp of the battery cell is 45 deg.c, the lower limit of Vth _ ov can be 3.60V and the upper limit of Vth _ uv can be 2.92V.
When the Cycle number of charge and discharge cycles is 1000 and the resistance Rcc is 19m Ω, if the temperature Temp of the cell is-10 ℃, the lower limit of Vth _ ov is 3.50V and the upper limit of Vth _ uv is 2.80V. If the temperature Temp of the battery cell is 25 deg.c, the upper limit value of Vth _ ov is 3.58V and the lower limit value of Vth _ uv is 2.89V. If the temperature Temp of the battery cell is 45 deg.c, the lower limit of Vth _ ov can be 3.48V and the upper limit of Vth _ uv can be 2.82V.
When the Cycle number of charge and discharge cycles is 3000 and the resistance Rcc is 33m Ω, if the temperature Temp of the cell is-10 ℃, the lower limit of Vth _ ov is 3.35V and the upper limit of Vth _ uv is 3.18V. If the temperature Temp of the battery cell is 25 deg.c, the upper limit value of Vth _ ov is 3.45V and the lower limit value of Vth _ uv is 3.10V. If the temperature Temp of the cell is 45 deg.c, the lower limit of Vth _ ov can be 3.33V and the upper limit of Vth _ uv can be 3.15V.
Thus, the Vth _ uv upper limit value, Vth _ uv lower limit value, Vth _ ov upper limit value and Vth _ uv lower limit value of the charge-discharge interval Cycle experiment performed under the conditions of several sets of different temperatures Temp, different numbers of charge-discharge cycles, and different impedances Rcc are recorded. Then all the sets of Vth _ ov upper limit values form an upper limit curve C63 for Vth _ ov and all the sets of Vth _ ov lower limit values form a lower limit curve C64 for Vth _ ov. All the sets of Vth _ uv upper limit values form an upper limit curve C73 for Vth _ uv, and all the sets of Vth _ uv lower limit values form a lower limit curve C74 for Vth _ uv.
Referring to fig. 8, in an embodiment, in the present embodiment, the battery charging and discharging management system 10 may be divided into one or more modules, and the one or more modules are stored in the memory 11 and executed by at least one processor (in this embodiment, one processor 12) to complete the present application. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the battery charge and discharge management system 10 in the electronic device 100. For example, the battery charge and discharge management system 10 may be divided into the acquisition module 101, the acquisition module 102, the determination module 103, and the control module 104 in fig. 8.
The collecting module 101 is configured to collect a voltage value of the battery 13.
The obtaining module 102 is configured to obtain a characteristic parameter of the battery 13.
The determining module 103 is configured to determine the protection range according to the corresponding relationship between the characteristic parameter and the protection range.
The control module 104 is configured to determine whether the voltage value of the battery 13 is within the protection range, and determine whether to perform turn-off control on the charging loop and the discharging loop.
Thereby, the battery 13 can be protected from charge and discharge, and the service life and reliability of the battery can be improved. For specific content, reference may be made to the above-mentioned embodiments of the battery charge and discharge management method, and details are not described herein.
In this embodiment, the memory 11 may be an internal memory of the electronic device 100, that is, a memory built in the electronic device 100. In other embodiments, the memory 11 may also be an external memory of the electronic device 100, that is, a memory externally connected to the electronic device 100.
In some embodiments, the memory 11 is used for storing program codes and various data, for example, program codes of the battery charging and discharging management system 10 installed in the electronic device 100, and realizes high-speed and automatic access to programs or data during the operation of the electronic device 100. For example, in the present embodiment, the battery charge and discharge management system 10 is configured to determine whether the voltage value of the battery 13 is within the protection range, and determine whether to perform shutdown control on the charge circuit and the discharge circuit.
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 an 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), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, a discrete hardware component, or the like. A general purpose processor may be a microprocessor or the processor 12 may be any other conventional processor or the like.
The modules in the battery charge and discharge management system 10, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the embodiments of the methods described above can be realized. 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, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
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.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (7)

1. A battery charge and discharge management method is characterized by comprising the following steps:
acquiring characteristic parameters of a battery; the characteristic parameters comprise the service life of the battery, the charge-discharge cycle times and the cell temperature;
determining the protection range according to the corresponding relation between the characteristic parameters and the protection range, wherein the protection range comprises an overvoltage protection range and an undervoltage protection range;
collecting a voltage value of a battery; and
judging whether the voltage value of the battery is within the protection range or not, and judging whether to perform turn-off control on a charging loop and a discharging loop or not;
wherein the step of determining the protection range according to the correspondence between the characteristic parameter and the protection range specifically includes:
acquiring an impedance value of the battery according to the service life or the charging and discharging cycle number of the battery, and determining a corresponding relation between an overvoltage protection threshold value and an undervoltage protection threshold value and the service life or the charging and discharging cycle number of the battery according to the impedance value of the battery;
acquiring the cell temperature of the battery, and judging whether the cell temperature of the battery is between a first key temperature point and a second key temperature point; and when the cell temperature of the battery is between the first key temperature point and the second key temperature point, increasing the overvoltage protection threshold value according to the corresponding relation between the overvoltage protection threshold value and the service life or the charging and discharging cycle number of the battery.
2. The battery charge and discharge management method according to claim 1, wherein the step of determining whether the voltage value of the battery is within the protection range and determining whether to perform turn-off control on the charge loop and the discharge loop specifically includes:
in the charging process, judging whether the maximum value of the voltage value of the battery is within the overvoltage protection range or not; and
and when the maximum value of the voltage value of the battery is not in the overvoltage protection range, performing turn-off control on the charging loop.
3. The battery charge and discharge management method according to claim 1, wherein the step of determining whether the voltage value of the battery is within a protection range and determining whether to perform shutdown control on the charge loop and the discharge loop further comprises:
in the discharging process, judging whether the minimum value of the voltage value of the battery is in the undervoltage protection range or not; and
and when the minimum value of the voltage value of the battery is not in the under-voltage protection range, performing turn-off control on the discharge loop.
4. The battery charge and discharge management method according to claim 3, further comprising:
and when the cell temperature of the battery is between the first key temperature point and the second key temperature point, reducing the undervoltage protection threshold value according to the corresponding relation between the undervoltage protection threshold value and the service life or the charging and discharging cycle times of the battery.
5. The battery charge and discharge management method according to claim 1, further comprising:
acquiring the cell temperature of the battery;
judging whether the cell temperature of the battery is less than or equal to the first key temperature point or whether the cell temperature of the battery is greater than the second key temperature point;
when the cell temperature of the battery is less than or equal to the first key temperature point or whether the cell temperature of the battery is greater than the second key temperature point, reducing the overvoltage protection threshold value according to the corresponding relation between the overvoltage protection threshold value and the service life or the charging and discharging cycle number of the battery; and
and when the cell temperature of the battery is less than or equal to the first key temperature point or whether the cell temperature of the battery is greater than the second key temperature point, increasing the undervoltage protection threshold value according to the corresponding relation between the undervoltage protection threshold value and the service life or the charging and discharging cycle number of the battery.
6. An electronic device, comprising:
a battery;
a processor; and
a memory in which a plurality of program modules are stored, the program modules being loaded by the processor and executing the battery charge and discharge management method according to any one of claims 1 to 5 to manage charge and discharge of the battery.
7. A storage medium having at least one computer instruction stored thereon, wherein the instruction is loaded by a processor to perform the battery charge and discharge management method according to any one of claims 1-5.
CN201910300917.6A 2019-04-15 2019-04-15 Battery charging/discharging management method, electronic device, and storage medium Active CN111834675B (en)

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