CN107611510B - Charging control method and charging control device - Google Patents
Charging control method and charging control device Download PDFInfo
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- CN107611510B CN107611510B CN201710768555.4A CN201710768555A CN107611510B CN 107611510 B CN107611510 B CN 107611510B CN 201710768555 A CN201710768555 A CN 201710768555A CN 107611510 B CN107611510 B CN 107611510B
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Abstract
The present invention relates to a charge control method and a charge control device. The attenuation of the battery charging capacity of the charging control method is used for adjusting the charging limiting voltage by judging the attenuation of the battery charging capacity in the charging process of the battery so as to keep the available capacity of the battery in the early and middle periods of the life cycle of the battery unchanged. In the charging process at every turn, the charging limiting voltage is adjusted upwards through the attenuation of the charging electric quantity during charging, so that the available electric quantity in the early and middle periods of the life cycle of the battery is kept unchanged, the driving mileage of the electric vehicle cannot be felt to be shortened, the user experience is better, the early charging voltage is lower, and the service life of the battery is prolonged.
Description
Technical Field
The invention relates to the field of lithium batteries, in particular to a charging control method and a charging control device.
Background
In the prior art, in the whole life cycle of the battery, the charging limit voltage of the battery is always unchanged, the battery is charged to the upper limit voltage of a single battery or a battery pack, and the charging is finished after the constant voltage is converted. The prior art has the following problems that on the one hand, the battery is always in a high-voltage state when fully charged, so that the battery is quickly attenuated, and the service life of the battery is influenced; on the second hand, the battery attenuation is fast, the driving mileage of the electric vehicle is obviously reduced along with the battery attenuation, and the customer experience is poor; in the third aspect, the battery state of charge is set to a high voltage upper limit state, and safety is reduced.
And (3) charge recovery: the battery is placed for a specified time under a certain voltage and a certain environment, and is discharged again, fully charged and discharged again to cut-off voltage, and the electric quantity discharged by the last discharge is the recovered electric quantity. The higher the battery holding voltage is, the less the recovery capacity is, and the capacity cannot be restored, affecting the service life.
Disclosure of Invention
The invention aims to provide a charging control method and a charging control device, which can keep the available electric quantity in the early and middle periods of the life cycle of a battery unchanged.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
the invention provides a charging control method, which is characterized in that in the charging process of a battery, the attenuation of the charging electric quantity of the battery is judged to adjust the charging limiting voltage upwards so as to keep the available electric quantity in the early and middle periods of the life cycle of the battery unchanged.
The present invention also provides a charge control device, including:
the judging module is suitable for judging the attenuation of the charging electric quantity of the battery;
and the up-regulation module is suitable for up-regulating the charging limiting voltage.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a charging control method and a charging control device, wherein in the charging process of a battery, the charging control method designs a charging strategy by judging the attenuation amount of the charging electric quantity of the battery, so that the charging electric quantity is kept unchanged in the early and middle stages of the life cycle of the battery, a vehicle user can obtain stable driving mileage at the battery, the driving anxiety of the user caused by insufficient driving mileage is avoided, the driving safety is influenced, and the electric quantity is kept unchanged in winter due to the low-temperature capacity of a lithium battery, so that the driving mileage of the driver in winter is kept unchanged.
Furthermore, the charging strategy of the invention keeps the charging electric quantity of the battery stable in each charging process, and does not need to be charged to the upper limit voltage V in each charging process, the higher the charging voltage is under the same condition of the lithium battery, and the lower the capacity after charge recovery is, the charging strategy of the invention does not need to charge the battery to the upper limit voltage V in each charging process, the lower charging voltage is beneficial to prolonging the service life of the battery, and the lower charging voltage improves the safety of the lithium battery in use.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a block diagram of a control device 100 according to an embodiment of the present invention
Fig. 2 is a flowchart illustrating a charging control method according to a preferred embodiment of the invention.
Fig. 3 is a flowchart illustrating sub-steps of step S110 shown in fig. 2.
Fig. 4 is a flowchart illustrating sub-steps of step S120 shown in fig. 2.
Fig. 5 is a flowchart illustrating sub-steps of step S122 shown in fig. 4.
Fig. 6 is a block diagram illustrating a charging control apparatus according to an embodiment of the present invention.
Fig. 7 is a block diagram illustrating a determining module of a charging control apparatus according to an embodiment of the present invention.
Fig. 8 is a block diagram illustrating an up-regulation module of a charging control apparatus according to an embodiment of the present invention.
Fig. 9 is a block diagram illustrating a second obtaining submodule of the charging control apparatus according to the embodiment of the present invention.
Fig. 10 is a discharge capacity-voltage curve after X cycles.
In the figure: 100-a control device; 101-a memory; 102-a memory controller; 103-a processor; 200-a charge control device; 110-a judgment module; 111-a first acquisition submodule; 112-a first comparison submodule; 120-up-regulation module; 121-a second acquisition submodule; 122-a first execution submodule; 123-a second execution submodule; 1A-initial discharge capacity-voltage curve; discharge capacity-voltage curve after 1B-X cycles; 2A-first use straight line; 2B-Xth demand line.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Referring to fig. 1, a block diagram of a control device 100 according to an embodiment of the present invention is shown. Control apparatus 100 the control apparatus 100 includes a charging control device 200, a memory 101, a storage controller 102, and a processor 103.
The memory 101, the memory controller 102 and the processor 103 are electrically connected to each other directly or indirectly to realize data transmission or interaction. For example, the components may be electrically connected to each other through one or more signal lines. The charging control apparatus 200 includes at least one software function module which may be stored in the memory 101 in the form of software or firmware (firmware) or solidified in an Operating System (OS) of the control device 100. The processor 103 is used to execute the executable modules stored in the memory 101.
The Memory 101 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory 101 is used for storing a program, and the processor 103 executes the corresponding program after receiving an execution instruction, and the executed method defined by the flow disclosed in any embodiment of the present invention may be applied to the processor 103, or implemented by the processor 103.
The processor 103 may be an integrated circuit chip having signal processing capabilities. The processor 103 may be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor 103 may be any conventional processor or the like.
First embodiment
Referring to fig. 2, fig. 2 is a flowchart illustrating a charging control method according to a preferred embodiment of the invention. The method comprises the following steps:
s110: and judging the attenuation amount of the charging electric quantity of the battery.
The amount of attenuation of the Battery charge amount is calculated by a Battery Management System (BMS).
S120: the charge limit voltage is adjusted up.
During each charging process, the charging limit voltage is adjusted up by the BMS according to the amount of battery degradation during the last charging process.
Referring to fig. 3, step S110 further includes the following steps:
s111: charging to a charging limit voltage VnObtaining the charging quantity E of the batterynThen, the attenuation y of the battery charging capacity is calculatedn。
Charging to a charging limit voltage VnObtaining the charging quantity E of the batterynThen, the amount of attenuation of the battery charge amount is calculated by the BMS.
S112: attenuation y of battery charging capacitynAnd comparing the attenuation with a preset attenuation y.
The calculated attenuation ynComparing with a preset attenuation y when the attenuation y isnWhen the preset attenuation y is reached, the charging limit voltage of the battery needs to be adjusted at this time.
Referring to fig. 4, step S120 further includes the following steps:
s121: obtaining an initial charge limiting voltage V1。
Obtaining initial charging limiting voltage V through BMS1。
S122: when the battery is charged1Attenuation y of1And when the attenuation is less than the preset attenuation y, the charging is finished.
When the battery is charged1Attenuation y of1When the attenuation y is less than the preset attenuation y, the charging is completed to prolong the service life of the battery.
S123: when the battery is charged1Attenuation y of1When the voltage is equal to or greater than a preset attenuation y, limiting the initial charging to a voltage V1Is adjusted up to V2。
When the battery is charged1Attenuation y of1When the voltage is equal to or greater than a preset attenuation y, limiting the initial charging to a voltage V1Is adjusted up to V2。
The steps further include correcting a State of Charge (SOC) curve of the battery pack after the initial Charge limiting voltage V1 is adjusted up to V2.
S124: continuing to charge to the limit voltage V2Then, the battery charging capacity E is obtained again2Attenuation y of2When the battery is charged by electric energy E2Attenuation y of2And when the attenuation is less than the preset attenuation y, the charging is finished.
Continuing to charge to the limit voltage V2Then, the battery charging capacity E is obtained again2Attenuation y of2When the battery is charged by electric energy E2Attenuation y of2And when the attenuation is less than the preset attenuation y, the charging is finished.
S125: up to VnEqual to the upper limit voltage V or the battery charge EnAttenuation y ofnAnd when the attenuation is less than the preset attenuation y, the charging is finished.
Up to VnEqual to the upper limit voltage V or the battery charge EnAttenuation y ofnAnd when the attenuation is less than the preset attenuation y, the charging is finished.
Referring to fig. 5, step S121 further includes the following sub-steps:
s1211: the battery charging upper limit voltage V is divided into N segments.
The upper limit voltage V for charging the battery is divided into N sections so as to achieve the purpose of adjusting the charging limit voltage for multiple times, thereby achieving the purpose of prolonging the service life of the battery.
S1212: selecting X% of electric quantity as initial charging limiting voltage V according to battery characteristics1。
Selecting X% of electric quantity as initial charging limiting voltage V according to battery characteristics1。
Second embodiment
Referring to fig. 6, a charging control apparatus 200 is provided according to an embodiment of the present invention. The charging control apparatus 200 is applied to the control device 100, and includes a determining module 110 and an upscaling module 120.
The determining module 110 is adapted to determine the attenuation of the charging power of the battery.
In this embodiment of the present invention, the determining module 110 may be configured to execute step S110.
An up-regulation module 120 adapted to up-regulate the charge limit voltage.
In this embodiment of the present invention, the tuning-up module 120 may be configured to perform step S120.
Referring to fig. 7, the determining module further includes a first obtaining sub-module 111 and a first comparing sub-module 112.
A first acquisition submodule 111 for charging to a charging limit voltage VnObtaining the charging quantity E of the batterynThen, the attenuation y of the battery charging capacity is calculatedn。
In this embodiment of the present invention, the first obtaining sub-module 111 may be configured to execute step S111.
A first comparison submodule 112 for attenuating the charge power y of the batterynAnd comparing the attenuation with a preset attenuation y.
In an embodiment of the present invention, the first comparison sub-module 112 may be configured to perform step S112.
Referring to fig. 8, the up-regulation module 120 includes a second obtaining sub-module 121, a first executing sub-module 122, a second executing sub-module 123, and a third executing sub-module 124.
A second obtaining submodule 121 adapted to obtain an initial charge limit voltage V1。
In this embodiment of the present invention, the second obtaining sub-module 121 may be configured to execute step S121.
A first execution submodule 122 for executing the battery charging quantity E1Attenuation y of1And when the attenuation is less than the preset attenuation y, the charging is finished.
In the embodiment of the present invention, the first execution sub-module 122 may be configured to execute step S122.
A second execution submodule 123 for executing the second execution submodule when the battery charging capacity E is smaller1Attenuation y of1When the voltage is equal to or greater than a preset attenuation y, limiting the initial charging to a voltage V1Is adjusted up to V2。
In the embodiment of the present invention, the second execution sub-module 123 may be configured to execute step S123.
A third execution submodule 124 for continuing charging to the limit voltage V2Then, the battery charging capacity E is obtained again2Attenuation y of2When the battery is charged by electric energy E2Attenuation y of2And when the attenuation is less than the preset attenuation y, the charging is finished.
In the embodiment of the present invention, the third execution sub-module 124 may be configured to execute step S124.
A fourth execution submodule 125 for up to VnEqual to the upper limit voltage V or the battery charge EnAttenuation y ofnAnd when the attenuation is less than the preset attenuation y, the charging is finished.
In the embodiment of the present invention, the fourth execution submodule 125 may be configured to execute step S125.
Referring to fig. 9, the second obtaining sub-module 121 further includes a grading sub-unit 1211 and a selecting sub-unit 1212.
The classification subunit 1211 is configured to divide the battery charging upper limit voltage V into N segments.
In an embodiment of the present invention, the ranking subunit 1211 may be configured to perform step S1211.
A selection stator unit 1212 for selecting X% of the electricity quantity as an initial charging limiting voltage V according to the battery characteristics1。
In this embodiment of the present invention, the first execution subunit 1212 may be configured to execute step S1212.
Please refer to fig. 10, a curve 1A of initial discharge capacity versus voltage, and a curve 1B of discharge capacity versus voltage after X cycles.
Assuming that a rider needs 74wh to drive, the energy between the initial use straight line 2A and the initial discharge capacity-voltage curve 1A can meet the requirement of driving, the first charging voltage is about 3.85V, and as the battery decays, the 74wh electric quantity still to be discharged after the X +1 th cycle needs to be adjusted to 3.95V according to the electric quantity between the X-th required straight line 2B and the initial use straight line 2A, so that the corresponding stroke can be completed. Compared with other existing systems, the charging method and the charging system have the advantages that the adjustment is carried out through hardware or the charging is carried out aiming at the whole system, the charging strategy adjustment is carried out only aiming at the battery, the applicability is stronger, the application range is wider, and the charging method and the charging system can be applied to various vehicle bodies or equipment driven by electric quantity.
In summary, the embodiments of the present invention provide a charging control method and a charging control apparatus. The charge control method is characterized in that the attenuation of the battery charge electric quantity is judged in the battery charge process to adjust the charge limiting voltage upwards so as to prolong the service life of the battery. In the charging process of each time, the charging limiting voltage is adjusted upwards according to the attenuation amount during the last charging, the service life of the battery is prolonged, a user cannot feel that the driving distance of the residual electric quantity of the electric vehicle is shortened in a long period of time when using the electric vehicle, and the user experience is good.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (5)
1. A charge control method is characterized in that,
during the charging process of the battery, the charging limiting voltage is adjusted up by judging the decrement of the charging electric quantity of the battery so as to keep the available electric quantity in the early and middle periods of the life cycle of the battery unchanged,
the method for judging the attenuation of the charging capacity of the battery comprises the following steps:
charging to a charging limit voltage VnObtaining the charging quantity E of the batterynThen, the attenuation y of the battery charging capacity is calculatedn；
The attenuation amount y of the charging electric quantity of the batterynComparing the attenuation quantity with a preset attenuation quantity y,
the method for adjusting up the charging limiting voltage comprises the following steps:
obtaining an initial charge limiting voltage V1；
When the battery charging capacity E1Attenuation y of1When the attenuation is less than the preset attenuation y, the charging is finished;
when the battery charging capacity E1Attenuation y of1When the initial charge is equal to or greater than the preset attenuation y, limiting the initial charge to a voltage V1Is adjusted up to V2；
Continuing to charge to the limit voltage V2Then, the charging electric quantity E of the battery is obtained again2Attenuation y of2When is coming into contact withThe charging capacity E of the battery2Attenuation y of2When the attenuation is less than the preset attenuation y, the charging is finished;
up to VnIs equal to the upper limit voltage V or the battery charging quantity EnAttenuation y ofnAnd when the attenuation is less than the preset attenuation y, finishing charging.
2. The charge control method according to claim 1,
the method of acquiring the initial charge limit voltage V1 includes:
dividing the upper limit voltage V for charging the battery into N sections;
selecting X% of electric quantity as initial charging limiting voltage V according to battery characteristics1。
3. The charge control method according to claim 1,
when the battery charging capacity E1Attenuation y of1When the initial charge is equal to or greater than the preset attenuation y, limiting the initial charge to a voltage V1Is adjusted up to V2The method of (2) further comprises:
limiting the initial charging to a voltage V1Is adjusted up to V2After that, the SOC curve is corrected.
4. A charge control device, characterized by comprising:
the judging module is suitable for judging the attenuation of the charging electric quantity of the battery;
an up-regulation module adapted to up-regulate the charge limit voltage,
the judging module further comprises:
the first obtaining submodule is suitable for obtaining the attenuation of the charging electric quantity of the battery;
a first comparison sub-module adapted to compare the obtained attenuation amount with a preset attenuation amount,
the upward adjustment module comprises:
a second obtaining submodule adapted to obtain an initial charge limit voltage V1；
A first execution submodule for executing the first execution submodule when the battery charging capacity E is1Attenuation y of1When the attenuation is less than the preset attenuation y, the charging is finished;
a second execution submodule for executing the second execution submodule when the battery charging capacity E is smaller1Attenuation y of1When the initial charge is equal to or greater than the preset attenuation y, limiting the initial charge to a voltage V1Is adjusted up to V2；
A third execution submodule for continuing charging to the limit voltage V2Then, the charging electric quantity E of the battery is obtained again2Attenuation y of2When the battery charging capacity E2Attenuation y of2When the attenuation is less than the preset attenuation y, the charging is finished;
a fourth execution submodule for up to VnIs equal to the upper limit voltage V or the battery charging quantity EnAttenuation y ofnAnd when the attenuation is less than the preset attenuation y, finishing charging.
5. The charge control device according to claim 4,
the second obtaining sub-module further includes:
the grading subunit is used for dividing the battery charging upper limit voltage V into N sections;
a selection subunit for selecting X% of the electricity quantity as an initial charge limiting voltage V according to the battery characteristics1。
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| CN110843604B (en) * | 2019-10-24 | 2022-10-14 | 金龙联合汽车工业（苏州）有限公司 | Method for preventing overvoltage caused by repeated charging of power battery |
| CN116390073A (en) * | 2023-03-31 | 2023-07-04 | 深圳市每开创新科技有限公司 | Passive NFC chip, control method of passive NFC chip and passive NFC equipment |
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| CN1897398A (en) * | 2005-07-12 | 2007-01-17 | 乐金电子（昆山）电脑有限公司 | Controlling a charging operation of a battery |
| CN101752892A (en) * | 2010-02-10 | 2010-06-23 | 江西伏沃特蓄电池有限公司 | Fast charging method of storage battery |
| CN106463997A (en) * | 2014-06-13 | 2017-02-22 | 日产自动车株式会社 | Charge control device and charge control method |
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| JPH08195224A (en) * | 1995-01-19 | 1996-07-30 | Kyocera Corp | Method for determining completion of charge of battery |
| CN1897398A (en) * | 2005-07-12 | 2007-01-17 | 乐金电子（昆山）电脑有限公司 | Controlling a charging operation of a battery |
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