CN114665527A - Battery pack charging control method, electronic device, and storage medium - Google Patents

Battery pack charging control method, electronic device, and storage medium Download PDF

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CN114665527A
CN114665527A CN202011572766.9A CN202011572766A CN114665527A CN 114665527 A CN114665527 A CN 114665527A CN 202011572766 A CN202011572766 A CN 202011572766A CN 114665527 A CN114665527 A CN 114665527A
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battery
charge
voltage
charging
battery pack
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朱珊
关婷
吴飞
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Ningde Amperex Technology Ltd
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Ningde Amperex Technology Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • 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
    • H01M10/44—Methods for charging or discharging
    • H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially

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  • Engineering & Computer Science (AREA)
  • Power Engineering (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 charging control method of a battery pack, which comprises the following steps: determining a first charging voltage U of a target battery in a battery pack in an nth charge-discharge cyclenThe target battery is a single battery with the highest voltage in the charging process of the nth charge-discharge cycle of the battery pack; determining a second charging voltage U of the target battery in the nth charge-discharge cycleF(ii) a In the n + m charge-discharge cycles, the first charge voltage U is usednAnd the second charging voltage UFM is a preset integer greater than or equal to 1 as the charge cut-off voltage of each single cell in the battery pack during charging. According to the charge control method of the battery pack, the electronic device and the storage medium provided by the application, the cycle performance of the battery pack can be improved.

Description

Battery pack charging control method, electronic device, and storage medium
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a charging control method for a battery pack of a battery, an electronic device, and a storage medium.
Background
The battery pack is generally formed by connecting a plurality of single cells in series or in parallel. The single cells have inconsistency during processing or operation, so that the voltage of some single cells can continuously increase and the voltage of some single cells can continuously decrease during constant-voltage charging of the battery pack. In order to better protect the performance of the battery pack and ensure that the single cells are not overcharged, the charging cut-off conditions of the general battery pack are two, namely the cut-off voltage and the cut-off current of the battery pack, and the cut-off voltage of the single cells.
The cutoff voltage of the single cell is generally set to a constant value, and this method has a certain problem. Because the polarization resistance of a single cell continues to increase during cycling, particularly late in cycling, the polarization is already large. If the cut-off voltage of the battery cell is still controlled to the constant value, the SOC (state of charge) defined by the actual charging of the battery cell is caused to continuously decrease as the cycle progresses. Further, the capacity of the battery pack is rapidly reduced due to the charge cut-off condition of the single cells in the later period of the cycle, and the capacity of the battery pack has a large influence on the cycle performance of the battery pack.
Disclosure of Invention
In view of the above, it is desirable to provide a charging control method for a battery pack, an electronic device and a storage medium, which can improve the cycle performance of the battery pack.
An embodiment of the present application provides a method for controlling charging of a battery pack, the method including: determining a first charging voltage U of a target battery in a battery pack in an nth charge-discharge cyclenN is an integer greater than or equal to 1, Un＝OCVF+I×Rn-1，OCVFThe open-circuit voltage of the target battery in a preset charge state is obtained, and I is the cut-off current of the target battery when the charging is cut off; rn-1The polarization impedance of the target battery after the n-1 th charge-discharge cycle is obtained, wherein the target battery is a single battery with the highest voltage in the charging process of the battery pack in the nth charge-discharge cycle; determining a second charging voltage U of the target battery in the nth charge-discharge cycleF，UFDetermined according to the stability of the electrolyte and cathode materials in the target cell; and in the (n + m) th charge-discharge cycle, the first charging voltage UnAnd the second charging voltage UFM is greater than or equal to a charge cut-off voltage of each unit cell in the battery pack during chargingOr a preset integer equal to 1.
According to some embodiments of the present application, a polarization resistance R of the target battery after the n-1 th charge-discharge cycle is calculatedn-1The method comprises the following steps: monitoring the voltage and current of each battery in the battery pack during the (n-1) th charging process of the battery pack; setting the single battery with the highest voltage in the charging process as the target battery; acquiring a first voltage U and a current I of the target battery at the end of charging; after the charging is finished and the battery is kept still for a preset time, acquiring a second voltage U' of the target battery; calculating to obtain polarization impedance R according to the first voltage U, the second voltage U' and the current In-1Wherein R isn-1＝(U-U')/I。
According to some embodiments of the present application, an open-circuit voltage OCV of the target battery at a predetermined state of charge is obtainedFThe method comprises the following steps: acquiring a state of charge (SOC) -Open Circuit Voltage (OCV) curve of the target battery; presetting the state of charge of the target battery at the charge cut-off time; determining the open-circuit voltage OCV corresponding to the preset state of charge according to the preset state of charge and the SOC-open-circuit voltage OCV curveF。
According to some embodiments of the present application, the method of obtaining the state of charge SOC-open circuit voltage OCV curve of the target battery comprises: discharging the target battery at a preset multiplying power for a first preset time, and then standing the monocell; acquiring the voltage of the target battery during standing; and obtaining a SOC-open circuit voltage OCV curve of the target battery according to a plurality of voltage values of the target battery when the target battery is placed for standing after being discharged for a plurality of times.
According to some embodiments of the present application, the determining the second charging voltage U of the target battery in the nth charge-discharge cycleFThe method comprises the following steps: obtaining a corresponding potential of the material during oxidation reaction according to the material of the target battery, wherein the material comprises a cathode material or electrolyte in the target battery; subtracting the anode potential of the target battery from the potential to obtain the second charging voltage UF。
According to the present applicationIn some embodiments, the determining the second charging voltage U of the target battery in the nth charging and discharging cycleFThe method comprises the following steps: obtaining a corresponding potential of the material during oxidation reaction according to the material of the target battery; setting the potential to the second charging voltage UF。
According to some embodiments of the present application, the determining the second charging voltage U of the target battery in the nth charge-discharge cycleFThe method comprises the following steps: respectively adopting different preset potentials to carry out cyclic charge and discharge tests on the target battery; acquiring a plurality of capacity attenuation values of the battery cell of the target battery after cyclic charge and discharge under different preset potentials; confirming whether a capacity attenuation value in the plurality of capacity attenuation values is smaller than or equal to a preset value or not; when the capacity attenuation value is smaller than or equal to the preset value, the preset potential corresponding to the capacity attenuation smaller than or equal to the preset value is the second charging voltage UF。
According to some embodiments of the present application, the predetermined state of charge is greater than or equal to 95%.
Another embodiment of the present application provides an electronic device including a battery pack and a processor for executing the charging control method of the battery pack as described above.
Another embodiment of the present application provides a storage medium having at least one computer instruction stored thereon, the computer instruction being loaded by a processor and used to execute the method for controlling charging of a battery pack as described above.
The embodiment of the application adopts the first charging voltage U in the n + m times of charge-discharge cyclesnAnd a second charging voltage UFThe smaller of the above as a charge cut-off voltage of the target battery during charging. The first charging voltage is calculated according to the polarization impedance of the target battery in the last cycle, and the second charging voltage is a limit voltage determined according to the system characteristics of the battery pack. By adopting the method, the problem of capacity attenuation caused by the control of the voltage cut-off condition of the single battery in the circulation process of the battery pack can be solved.
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 method of controlling charging of a battery pack according to an embodiment of the present application.
Fig. 3 is a graph of voltage versus time of a target battery during charging.
Fig. 4 is a schematic diagram of an open circuit voltage curve of a target cell.
Fig. 5 is a schematic diagram of the cutoff voltage of a target battery during cycling according to an embodiment of the present application.
Fig. 6 is a graph comparing the capacity retention rate after controlling the charge and discharge cycles of the battery by the optimization method of the present application with the capacity retention rate after controlling the charge and discharge cycles of the battery by the conventional method.
Fig. 7 is a block diagram of a charge control system according to an embodiment of the present application.
Description of the main elements
Electronic device 1
Charging control system 100
Processor 11
Battery pack 12
Single cell 120
Determination module 101
Processing module 102
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, a charging control system 100 operates in an electronic device 1. The electronic device 1 includes, but is not limited to, at least one processor 11 and a battery pack 12, and the above elements may be connected via a bus or directly.
Fig. 1 is only an example of the electronic apparatus 1. In other embodiments, the electronic device 1 may also include more or fewer elements, or have a different arrangement of elements. The electronic device 1 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 pack 12 is a rechargeable battery for providing electrical energy to the electronic device 1. For example, the battery 12 may be a lithium ion battery, a lithium polymer battery, a lithium iron phosphate battery, or the like. The battery pack 12 includes a plurality of battery cells 120, and the battery pack 12 can be repeatedly charged in a rechargeable manner.
Although not shown, the electronic device 1 may further include a Wireless Fidelity (WiFi) unit, a bluetooth unit, a speaker, and other components, which are not described in detail herein.
Referring to fig. 2, fig. 2 is a flowchart illustrating a charging control method for a battery pack according to an embodiment of the present disclosure. The charge control method of the battery pack may include the steps of:
step S1: determining a first charging voltage U of a target battery in a battery pack in an nth charge-discharge cyclenN is an integer greater than or equal to 1, Un＝OCVF+I×Rn-1Wherein OCVFThe open-circuit voltage of the target battery in a preset charge state is obtained, and I is the cut-off current of the target battery when the charging is cut off; rn-1The polarization impedance of the target cell after the (n-1) th charge-discharge cycle. The target battery is a single battery with the highest voltage in the charging process of the battery pack in the nth charge-discharge cycle, and the preset charge state is greater than or equal to 95%.
Because the battery pack is formed by connecting a plurality of single batteries in series or in parallel, the condition of each single battery is different in the use process of the battery pack. At the time of assembly of the battery pack, not only the charge/discharge cutoff condition of the battery pack but also the charge/discharge cutoff condition of each single cell is set. In the prior art, in the later stage of the charge and discharge cycle use of the battery pack, due to the increase of polarization impedance of each single battery, the set charge and discharge cut-off condition is continuously used, so that the capacity of the battery pack is reduced. Then, in the present application, the target battery in the battery pack is detected in real time, and then the first charging voltage (i.e., the charging cut-off voltage) of the target battery is calculated according to the polarization impedance of the target battery. The charging cut-off voltage of each single battery in the battery pack in the using process is confirmed according to the first charging voltage and the set charging and discharging cut-off condition, so that the problem of capacity fading of the battery pack in the circulating process due to the control of the voltage cut-off condition of the single battery can be solved.
In one embodiment, the open-circuit voltage OCV of the target battery in a predetermined state of charge is obtainedFThe method comprises the following steps: acquiring a state of charge (SOC) -Open Circuit Voltage (OCV) curve of the target battery; presetting the state of charge of the target battery at the charge cut-off time; determining the open-circuit voltage corresponding to the preset state of charge according to the preset state of charge and the state of charge (SOC) -open-circuit voltage (OCV) curve, and recording the open-circuit voltage as the OCVF。
In another embodiment, the method of acquiring a state of charge (SOC) -Open Circuit Voltage (OCV) curve of the target battery includes: discharging the target battery at a preset multiplying power for a first preset time, and then standing the monocell; acquiring the voltage of the target battery during standing; and obtaining a SOC-open circuit voltage OCV curve of the target battery according to a plurality of voltage values of the target battery when the target battery is placed for standing after being discharged for a plurality of times.
For example, (1) discharging the target battery at a preset rate (e.g., 0.1C or 0.2C) for a first preset time, and then standing the target battery for a second preset time; (2) acquiring the voltage of the target battery after standing for a second preset time; (3) repeatedly executing the step (1) and the step (2) until the target battery is discharged, and obtaining a plurality of static voltages; (4) the curve obtained by connecting the plurality of settled voltages is a state of charge (SOC) -Open Circuit Voltage (OCV) curve of the target battery, as shown in fig. 3.
In the present embodiment, the polarization resistance R of the target battery after the n-1 th charge-discharge cycle is calculatedn-1The method comprises the following steps: monitoring the voltage and current of each single battery in the battery pack during the (n-1) th charging process of the battery pack; setting the single battery with the highest voltage in the charging process as the target battery; acquiring a first voltage U and a current I of the target battery at the end of charging; after the charging is finished and the battery is kept still for a third preset time, acquiring a second voltage U' of the target battery; it will be appreciated that the third predetermined time is generally greater than or equal to five minutes. Calculating to obtain polarization impedance R according to the first voltage U, the second voltage U' and the current In-1Wherein R isn-1(U-U')/I as shown in fig. 4.
Step S2: determining a second charging voltage U of a target battery in the battery pack in the nth charge-discharge cycleF，UFAs determined by the stability of the electrolyte and cathode materials in the target cell.
The impedance of the target cell is increasing during the charge and discharge cycles of the battery pack. If the first charging voltage is taken as the cutoff voltage of the target battery during the charge-discharge cycle. It is possible that the first charging voltage is greater than the limit voltage of the target battery. For example, the limit voltage of the target battery is 4.5V, and the first charging voltage of the target battery, which is obtained by calculation, is 4.6V, which is greater than the limit voltage of the target battery. If the first charging voltage is used as the cutoff voltage of the target battery during the charging process without considering the limit voltage of the target battery, the capacity of the battery pack is affected. Therefore, it is necessary to determine the second charging voltage UF of the target battery in the battery pack in the nth charge-discharge cycle and determine the cutoff voltage of the target battery in the charging process according to the magnitudes of the second charging voltage and the first charging voltage.
It will be appreciated that when the battery system is usedAfter the determination, the second charging voltage UFIt is determined. The second charging voltage U may be determined according to the characteristics of the cathode material or the electrolyte of the battery pack in consideration of the stability of the cathode material and the electrolyte of the battery packF。
In one embodiment, a second charging voltage U of the target battery in the battery pack in the nth charge-discharge cycle is determinedFThe method comprises the following steps: obtaining a corresponding potential of the material during an oxidation reaction according to the material of the target battery; subtracting the anode potential of the target battery from the potential to obtain the second charging voltage UF。
Specifically, the potential corresponding to the oxidation reaction of the material (cathode material, electrolyte solution, etc.) may be obtained by CV scanning of the material based on the material, and the anode potential of the target battery may be subtracted from the obtained potential to obtain the limit potential (i.e., the second charging voltage U) of the target batteryF)。
In one embodiment, the target cell may have an anode potential of only about 0.1V even in a fully charged state of the target cell because the target cell has a small anode potential. Therefore, the second charging voltage U of the target battery in the battery pack in the nth charge-discharge cycle is determinedFFurther comprising: obtaining a corresponding potential of the material (such as a cathode material or an electrolyte) during an oxidation reaction according to the material of the target battery; setting the potential to the second charging voltage UF。
In another embodiment, different limit potentials may be respectively used to perform a cyclic charge and discharge test on the target battery, so as to ensure that the capacity fading of the battery cell of the target battery after cyclic charge and discharge is within an acceptable range (for example, the battery capacity fading of the target battery after 500 charge and discharge cycles is less than 20% at an ambient temperature of 45 ℃), thereby determining the limit potential of the target battery during cyclic charge and discharge.
Specifically, a second charging voltage U of a target battery in the battery pack in the nth charge-discharge cycle is determinedFThe method comprises the following steps: respectively adopting different preset potential pairsCarrying out cyclic charge and discharge test on the standard battery; acquiring a plurality of capacity attenuation values of the battery cell of the target battery after cyclic charge and discharge under different preset potentials; confirming whether a capacity attenuation value less than or equal to a preset value (such as 20%) exists in the plurality of capacity attenuation values; when the capacity attenuation value is smaller than or equal to a preset value, the preset potential corresponding to the capacity attenuation smaller than or equal to the preset value is the second charging voltage UF。
The preset potential is a limit potential that the target battery can bear.
Step S3: in the n + m charge-discharge cycles, the first charge voltage U is usednAnd the second charging voltage UFM is a preset integer greater than or equal to 1 as the charge cut-off voltage of each single cell in the battery pack during charging.
As shown in fig. 5, according to the polarization resistance R of each unit cell in the charge and discharge cyclenCalculating a first charging voltage U of each celln＝OCVF+I×Rn-1. It can be seen that the first charging voltage increases during cycling because the polarization increases during the charge-discharge cycle. If we still adopt the set cut-off condition as the voltage limit of the single battery in the charging and discharging process, the actual charging SOC can be greatly reduced. Meanwhile, since the battery pack system itself is limited by the maximum cut-off voltage (second charging voltage), the charging cut-off voltage of the single cell takes the smaller value of the first charging voltage and the second charging voltage as the limit.
It is understood that the first charging voltage U may be applied during the n + m charge-discharge cyclesnAnd the second charging voltage UFThe smaller of the two is used as a charge protection voltage (i.e., a charge cutoff voltage) of each unit cell in the battery pack during charging.
In order to make the object, technical solution and technical effect of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. Comparative examples and electricity used in the examplesThe battery system is made of LiCoO2The cathode is graphite, the anode is graphite, the diaphragm, electrolyte and the packaging shell are added, and the cathode is prepared by the processes of mixing, coating, assembling, forming, aging and the like. The battery pack is obtained by connecting the batteries in series and parallel. The specific implementation is elaborated and compared to the cyclic capacity fade using the prior art method and the optimization method of the present application. As shown in fig. 6, it is apparent that the optimization method provided in the present application can provide a battery pack with a higher capacity retention rate.
It should be noted that comparative example 1 and example 1 below were tested at an ambient temperature of 25 ℃ and an ambient temperature of 45 ℃, respectively.
Comparative example 1: the battery pack includes 6 unit cells.
The method comprises the following steps: standing the battery pack for 40 minutes;
step two: charging the battery pack to 25.2V at a constant current of 6A, and then charging the battery pack to 0.02C at a constant voltage;
step three: standing the battery pack for 30 minutes;
step four: discharging the battery pack to 15V at a current of 40A;
step five: and repeating the steps one to four for 500 cycles.
Example 1: the battery pack also includes 6 cells.
The method comprises the following steps: standing the battery pack for 40 minutes;
step two: setting the maximum voltage bearable by the battery pack to be UF4.3V (i.e., the second charging voltage);
step three: charging the battery pack to 25.2V at a constant current of 6A, and then charging the battery pack to 0.02C at a constant voltage; recording the cut-off voltage and current of each single cell in the battery pack, marking the single cell with the highest voltage as a target battery A, marking the voltage as U and the current as I;
step four: standing the battery pack for 30 minutes;
step five: recording the voltage of the target battery A after standing as U';
step six: the charge cut-off voltage of the target battery can be obtained as follows:UL＝OCVF+ I '× ((U-U')/I), wherein said OCVFThe open-circuit voltage when the charge state of the target battery is 101%, and the I' is a charging cut-off current;
step seven: discharging the battery pack to 15V at a current of 40A;
step eight: standing the battery pack for 30 minutes;
step nine: charging the battery pack to 25.2V at a constant current of 6A, and then charging the battery pack to 0.02C at a constant voltage;
step ten: standing the battery pack for 30 minutes;
step eleven: discharging the battery pack to 15V at a current of 40A;
step twelve: standing the battery pack for 30 minutes;
step thirteen: repeating the step nine to the step twelve and 50 cycles;
fourteen steps: repeating the step three to the step thirteen 10 cycles.
C is a charge/discharge rate, which is a current value required for charging to a rated capacity or discharging the rated capacity within a predetermined time, and is numerically equal to a multiple of the rated capacity of the battery.
The capacity retention rate of the battery after 500 charge-discharge cycles can be obtained by recording the discharge capacity of the battery after 500 charge-discharge cycles during the cycle and dividing by the first discharge capacity of the battery according to the charge-discharge procedures of example 1 and comparative example 1 above, respectively. In addition, the capacity retention rates of the batteries of example 1 and comparative example 1 after 500 cycles of charge and discharge under the conditions of an ambient temperature of 25 ℃ and an ambient temperature of 45 ℃ are shown in table 1.
TABLE 1 Capacity Retention ratio of comparative example 1 and example 1
Figure BDA0002855215850000111
As can be seen from table 1, the capacity retention of the battery pack can be improved by about 10% by using the charge control method (i.e., the optimization method) of the present application, and the cycle performance of the battery pack can be improved. In addition, the optimization method of the application can enable the battery pack to have higher capacity retention rate in the charging and discharging cycle process than the prior method even in a higher temperature environment. According to the method and the device, the charging cut-off voltage of the single battery is improved according to the actual polarization condition of the single battery in the circulation process, the possibility of cut-off of the single battery voltage of the battery pack caused by the polarization effect of the battery is eliminated, and the attenuation problems of sudden capacity reduction and the like of the battery pack are controlled.
Referring to fig. 7, in this embodiment, the charging control system 100 may be divided into one or more modules, and the one or more modules may be stored in the processor 11, and the processor 11 executes the charging control method for the battery pack according to the embodiment of the present application. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used for describing the execution process of the charging control system 100 in the electronic device 1. For example, the charging control system 100 may be divided into a determination module 101 and a processing module 102 in fig. 7.
The determining module 101 is configured to determine a first charging voltage U of a target battery in a battery pack in an nth charging and discharging cyclenN is an integer greater than or equal to 1, Un＝OCVF+I×Rn-1，OCVFThe open-circuit voltage of the target battery in a preset charge state is obtained, and I is the cut-off current of the target battery when the charging is cut off; r isn-1The polarization impedance of the target battery after the n-1 th charge-discharge cycle is obtained, wherein the target battery is a single battery with the highest voltage in the charging process of the battery pack in the nth charge-discharge cycle; the determining module 101 is further configured to determine a second charging voltage U of the target battery in an nth charging and discharging cycleF，UFDetermined according to the stability of the electrolyte and cathode materials in the target cell; the processing module 102 is configured to charge and discharge at the first charging voltage U in the n + m charging and discharging cyclesnAnd the second charging voltage UFAs each of the battery packsAnd m is a preset integer which is greater than or equal to 1.
The charging control system 100 can solve the problem that the charging cut-off voltage of the single battery is raised according to the actual polarization condition of the single battery in the circulation process. The possibility of voltage cut-off of a single battery due to battery polarization of the battery pack is eliminated, and the problem of attenuation such as sudden capacity drop of the battery pack is solved. For details, reference may be made to the above-mentioned embodiments of the charging control method for the battery pack, and details are not described herein.
In an embodiment, the Processor 11 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. The general purpose processor may be a microprocessor or the processor 11 may be any other conventional processor or the like.
The modules in the charging control system 100, if implemented in the form of software functional units and sold or used as separate 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 suitable additions or subtractions depending on the requirements of legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer-readable media may not include electrical carrier signals or telecommunication signals in accordance with 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.
In another embodiment, the electronic device 1 may further include a memory (not shown), and the one or more modules may be further stored in the memory and executed by the processor 11. The memory may be an internal memory of the electronic device 1, i.e. a memory built into the electronic device 1. In other embodiments, the memory may also be an external memory of the electronic device 1, i.e. a memory externally connected to the electronic device 1.
In some embodiments, the memory is used for storing program codes and various data, for example, storing program codes of the charging control system 100 installed in the electronic device 1, and realizing high-speed and automatic access to programs or data during the operation of the electronic device 1.
The memory 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.
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 (10)

1. A charge control method of a battery pack, characterized by comprising:
determining a first charging voltage U of a target battery in a battery pack in an nth charge-discharge cyclenN is an integer greater than or equal to 1, Un＝OCVF+I×Rn-1Wherein OCVFAn open circuit voltage of the target battery at a preset state of charge;
i is the cut-off current of the target battery when the charging is cut off;
Rn-1the polarization impedance of the target battery after the n-1 th charge-discharge cycle is obtained, wherein the target battery is a single battery with the highest voltage in the charging process of the battery pack in the nth charge-discharge cycle;
determining a second charging voltage U of the target battery in the nth charge-discharge cycleF，UFDetermined according to the stability of the electrolyte and cathode materials in the target cell;
in the n + m charge-discharge cycles, the first charge voltage U is usednAnd the second charging voltage UFM is a preset integer greater than or equal to 1 as the charge cut-off voltage of each single cell in the battery pack during charging.
2. The battery pack charging control method according to claim 1, wherein the polarization resistance R of the target battery after the n-1 th charge-discharge cycle is calculatedn-1The method comprises the following steps:
monitoring the voltage and current of each battery in the battery pack during the (n-1) th charging process of the battery pack;
setting the single battery with the highest voltage in the charging process as the target battery;
acquiring a first voltage U and a current I of the target battery at the end of charging;
after the charging is finished and the battery is kept still for a preset time, acquiring a second voltage U' of the target battery;
calculating to obtain polarization impedance R according to the first voltage U, the second voltage U' and the current In-1Wherein R isn-1＝(U-U')/I。
3. The battery pack charge control method according to claim 2, wherein an open-circuit voltage OCV of the target battery at a preset state of charge is acquiredFThe method comprises the following steps:
acquiring a state of charge (SOC) -Open Circuit Voltage (OCV) curve of the target battery;
presetting the state of charge of the target battery at the charge cut-off time;
determining the open-circuit voltage OCV corresponding to the preset state of charge according to the preset state of charge and the state of charge SOC-open-circuit voltage OCV curveF。
4. The charge control method of a battery pack according to claim 3, wherein the method of acquiring the state of charge SOC-open circuit voltage OCV curve of the target battery includes:
discharging the target battery at a preset multiplying power for a first preset time, and then standing the monocell;
acquiring the voltage of the target battery during standing;
and obtaining a SOC-OCV curve of the target battery according to a plurality of voltage values of the target battery when the target battery is placed for a plurality of times after being discharged.
5. Charge control of a battery as claimed in claim 1Method, characterized in that the second charging voltage U of the target battery in the nth charge-discharge cycle is determinedFThe method comprises the following steps:
obtaining a corresponding potential of the material during oxidation reaction according to the material of the target battery;
subtracting the anode potential of the target battery from the potential to obtain the second charging voltage UF。
6. The battery pack charging control method according to claim 1, wherein the determination of the second charging voltage U of the target battery in the nth charge-discharge cycleFThe method comprises the following steps:
obtaining a corresponding potential of the material during oxidation reaction according to the material of the target battery;
setting the potential to the second charging voltage UF。
7. The battery pack charging control method according to claim 1, wherein the determination of the second charging voltage U of the target battery in the nth charge-discharge cycleFThe method comprises the following steps:
respectively adopting different preset potentials to carry out cyclic charge and discharge tests on the target battery;
acquiring a plurality of capacity attenuation values of the battery cell of the target battery after cyclic charge and discharge under different preset potentials;
confirming whether a capacity attenuation value in the plurality of capacity attenuation values is smaller than or equal to a preset value or not;
when the capacity attenuation value is smaller than or equal to the preset value, the preset potential corresponding to the capacity attenuation smaller than or equal to the preset value is the second charging voltage UF。
8. The method of claim 3, wherein the predetermined state of charge is greater than or equal to 95%.
9. An electronic device, comprising:
a battery pack; and
a processor for performing the charge control method of the battery pack according to any one of claims 1 to 8.
10. A storage medium having stored thereon at least one computer instruction, wherein the instruction is loaded by a processor and used to execute a method of controlling charging of a battery pack according to any of claims 1 to 8.
CN202011572766.9A 2020-12-23 2020-12-23 Battery pack charging control method, electronic device, and storage medium Pending CN114665527A (en)

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