CN115940308A - Battery health management method and battery health management device - Google Patents
Battery health management method and battery health management device Download PDFInfo
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- CN115940308A CN115940308A CN202110975478.6A CN202110975478A CN115940308A CN 115940308 A CN115940308 A CN 115940308A CN 202110975478 A CN202110975478 A CN 202110975478A CN 115940308 A CN115940308 A CN 115940308A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application provides a battery health management method, which comprises the following steps: the method comprises the steps of charging the battery to enable the battery voltage of the battery to rise from an initial voltage to a rated voltage, driving the battery to discharge according to a fixed expected discharge rate after the battery voltage rises to the rated voltage to enable the battery voltage to fall from the rated voltage to a storage voltage, and enabling the battery to discharge automatically according to a standing discharge rate after the battery voltage falls to the storage voltage, wherein the expected discharge rate is larger than the standing discharge rate. When the battery voltage after the battery is static is equal to the storage voltage, the battery is charged so that the battery voltage is increased from the storage voltage to the rated voltage. In addition, the application further provides a battery health management device.
Description
Technical Field
The present disclosure relates to battery management methods and battery management apparatuses, and more particularly, to a battery health management method and a battery health management apparatus capable of delaying aging time of a battery.
Background
With the increasing demand of people on battery application, more attention is paid to the capacity and the service life of the battery. Fig. 1 is a graph of battery voltage versus time for a battery of a conventional uninterruptible power system, in which, as shown in fig. 1, the battery is first charged by a constant current/constant voltage charging method (CCCV) such that the battery voltage rises from an initial voltage (3.0V) to a rated voltage (4.0V). After finishing the constant current/constant voltage charging, the battery enters a standing stage, the battery automatically discharges in the standing stage, and when the battery voltage of the battery is reduced from the rated voltage to a recharging reference voltage (3.9V) through the self-discharging, the battery is recharged by adopting a constant current/constant voltage charging method (CCCV) so that the battery voltage of the battery is increased from the recharging reference voltage to the rated voltage. Since the time required for the battery voltage of the battery to drop from the rated voltage to the recharge reference voltage through self-discharge is as long as 3 months, the battery voltage of the battery is in a state higher than the recharge reference voltage for a long time in the standing stage, thereby causing the battery to be easily and rapidly aged.
Disclosure of Invention
The technical problem to be solved by the present application is to provide a battery health management method for the deficiency of the prior art, which is characterized by comprising: charging a battery to raise a battery voltage of the battery from an initial voltage to a rated voltage; after the battery voltage rises to the rated voltage, driving the battery to discharge according to a fixed expected discharge rate so as to reduce the battery voltage from the rated voltage to a storage voltage; after the battery voltage is reduced to the storage voltage, the battery is placed still to enable the battery to discharge automatically according to a standing discharge rate, and the fixed expected discharge rate is larger than the standing discharge rate; and when the battery voltage after the battery is static is equal to the storage voltage, recharging the battery so as to enable the battery voltage to rise from the storage voltage to the rated voltage.
Preferably, charging the battery to raise the battery voltage of the battery from the initial voltage to the rated voltage comprises: charging the battery through a constant current until the battery voltage reaches the rated voltage; and charging the battery through a certain voltage after the battery voltage reaches the rated voltage, so that the battery voltage is maintained at the rated voltage for charging until a battery current of the battery is reduced to a cutoff charging current.
Preferably, during the process of standing the battery, the battery voltage of the battery first rises from the storage voltage to a first voltage, and then the battery voltage of the battery falls from the first voltage to the storage voltage.
Preferably, the discharging of the battery according to the fixed expected discharge rate is performed by discharging the battery through a constant current until the battery voltage drops to the storage voltage.
The application also discloses battery health management device, its characterized in that includes: a detection circuit for detecting a battery voltage and a battery current of a battery; and a controller electrically connected to the detection circuit; wherein the controller charges the battery to raise the battery voltage of the battery from an initial voltage to a rated voltage; after the battery voltage rises to the rated voltage, the controller drives the battery to discharge according to a fixed expected discharge rate so as to enable the battery voltage to be reduced from the rated voltage to a storage voltage; after the battery voltage drops to the storage voltage, standing the battery to enable the battery to automatically discharge according to a standing discharge rate, wherein the fixed expected discharge rate is greater than the standing discharge rate; and when the battery voltage after the battery is static is equal to the storage voltage, the controller recharges the battery to enable the battery voltage to rise from the storage voltage to the rated voltage.
Preferably, the controller charges the battery according to a constant current until the battery voltage reaches the rated voltage, and after the battery voltage reaches the rated voltage, the controller charges the battery according to a constant voltage to maintain the battery voltage at the rated voltage for charging until a battery current of the battery drops to a cutoff charging current.
Preferably, the detection circuit includes a first input terminal and a first output terminal, the controller includes a second input terminal and a second output terminal, the first input terminal is electrically connected to the battery, the first output terminal is electrically connected to the second input terminal, and the second output terminal is electrically connected to the battery.
Preferably, the controller drives the battery to discharge according to the fixed expected discharge rate by driving the battery to discharge through a constant current until the battery voltage drops to the storage voltage.
The application also discloses battery health management device, its characterized in that includes: charging a battery to raise a battery voltage of the battery from an initial voltage to a rated voltage; after the battery voltage rises to the rated voltage, driving the battery to discharge according to a non-fixed expected discharge rate so as to reduce the battery voltage from the rated voltage to a storage voltage; after the battery voltage is reduced to the storage voltage, the battery is placed still to enable the battery to discharge automatically according to a standing discharge rate, wherein the non-fixed expected discharge rate is larger than the standing discharge rate; and when the battery voltage after the battery is static is equal to the storage voltage, recharging the battery to enable the battery voltage to rise from the storage voltage to the rated voltage.
Preferably, the discharging of the battery according to the non-fixed expected discharge rate is driven by a discharging current that continuously increases with time or continuously decreases with time until the battery voltage drops to the storage voltage.
One of the benefits of the present disclosure is that, through the battery health management method and the battery health management apparatus of the present disclosure, the controller actively drives the battery to discharge according to the expected discharge rate, and the expected discharge rate is greater than the standing discharge rate of the battery. Therefore, compared with the prior art that the battery is only discharged by self when in the standing stage, the time required for the voltage of the battery to be reduced from the rated voltage to the storage voltage can be greatly reduced. Therefore, the time that the battery voltage of the battery is higher than the storage voltage is greatly shortened, and the purpose of delaying the aging of the battery is achieved.
For a better understanding of the nature and technical content of the present application, reference should be made to the following detailed description and accompanying drawings, which are provided for purposes of illustration and description only and are not intended to limit the present application.
Drawings
FIG. 1 is a graph of battery voltage versus time for a battery of a conventional UPS system.
Fig. 2 is a functional block diagram of a battery health management device according to an embodiment of the present application.
Fig. 3 is a flowchart of a battery health management method according to a first embodiment of the present application.
Fig. 4 is a flowchart of a battery health management method according to a second embodiment of the present application.
Fig. 5 is a graph of battery voltage versus time using the battery health management method of fig. 3.
Detailed Description
The following description is provided for the implementation of the battery health management method and the battery health management apparatus provided in the present application by specific embodiments, and those skilled in the art can understand the advantages and effects of the present application from the content provided in the present specification. The present application is capable of other and different embodiments and its several details are capable of modifications and variations in various respects, all without departing from the present application. The drawings in the present application are for illustrative purposes only and are not intended to be drawn to scale. The following embodiments will further explain the related art contents of the present application in detail, but the contents are not provided to limit the scope of the present application.
It will be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one element from another element, or from one signal to another signal. In addition, the term "or" as used herein should be taken to include any one or combination of more of the associated listed items as the case may be.
In order to solve the problem of battery aging, the present application provides a battery health management method and a battery health management device, after a battery is charged at a constant current/constant voltage, a controller actively drives the battery to discharge according to an expected discharge rate, and then the battery discharges automatically according to a standing discharge rate when standing, because the expected discharge rate is greater than the standing discharge rate, the time required by the battery voltage to drop from a rated voltage to a storage voltage is reduced, and the time required by the battery voltage of the battery to be higher than the storage voltage is greatly shortened.
[ first embodiment ]
Fig. 2 is a functional block diagram of a battery health management device suitable for a battery according to an embodiment of the present disclosure. As shown in fig. 2, the battery health management apparatus a includes a detection circuit 1 and a controller 2, the detection circuit 1 includes a first input terminal 11 and a first output terminal 12, and the controller 2 includes a second input terminal 21 and a second output terminal 22. The first input terminal 11 of the detection circuit 1 is electrically connected to a battery B for detecting a battery voltage and a battery current of the battery B. The first output terminal 12 of the detection circuit 1 is electrically connected to the second input terminal 21 of the controller 2, so that the controller 2 obtains the battery voltage and the battery current of the battery B. The second output terminal 22 of the controller 2 is electrically connected to the battery B and performs a battery health management method on the battery B according to the battery voltage and the battery current.
Specifically, the kind of the battery B to which the battery health management apparatus a is applied is not limited, and the battery may be, for example, a battery of an uninterruptible power system or a fuel cell. The controller 2 is, for example, a Microprocessor (Microprocessor) or a Digital Signal Processor (DSP), or the like, or other similar devices or combinations thereof. Regarding the embodiments of the detection circuit 1 and the controller 2, the detection circuit 1 and the controller 2 may be, for example, two different chips respectively or integrated in the same chip.
In other embodiments of the battery health management apparatus a, the battery health management apparatus a may further include a first wireless communication module and a second wireless communication module, the detection circuit 1 and the controller 2 are electrically connected to the first wireless communication module and the second wireless communication module, respectively, and the first wireless communication module and the second wireless communication module are in communication connection with each other. After the detection circuit 1 obtains the battery voltage and the battery current of the battery B, the controller 2 obtains the battery voltage and the battery current of the battery B through the communication connection of the first wireless communication module and the second wireless communication module.
Fig. 3 is a flowchart of a battery health management method according to a first embodiment of the present application. In step S31, the battery B is charged by a constant current/constant voltage charging method (CC/CV) through the controller 2 so that the battery voltage of the battery B is increased from the initial voltage to the rated voltage. In the constant current/constant voltage charging method, the controller 2 first charges the battery B with a constant current until the battery voltage of the battery B rises from the initial voltage to the rated voltage. Then, the controller 2 charges the battery B with a constant voltage to maintain the battery voltage of the battery B at the rated voltage for charging until the battery current of the battery decreases to the cut-off charging current. The magnitude of the constant current and the constant voltage during charging is properly adjusted according to the requirement of the user.
In step S32, after the constant current/constant voltage charging method is finished, the battery B is driven to discharge according to a fixed expected discharge rate through the controller 2, so that the battery voltage of the battery B is decreased from the rated voltage to the storage voltage. In detail, after the constant current/constant voltage charging method is finished, the battery B is driven to discharge according to the constant current through the controller 2, so that the battery voltage of the battery B is reduced from the rated voltage to the storage voltage.
In step S33, after the battery voltage of battery B decreases from the rated voltage to the storage voltage, battery B is left to discharge by itself according to the left discharge rate. Specifically, at the beginning of the resting stage of battery B, the battery voltage of battery B instantaneously rises by a voltage difference from the storage voltage, and then the battery voltage of battery B continuously drops until the battery voltage of battery B is equal to the storage voltage.
Further, the fixed expected discharge rate in step S32 is larger than the stationary discharge rate in step S33.
In step S34, when the battery voltage of the battery B after standing is equal to the storage voltage, the battery B is recharged by a constant current/constant voltage charging method (CC/CV) through the controller 2 so that the battery voltage of the battery B is increased from the storage voltage to the rated voltage. Specifically, in order to ensure that the charge of the battery B is sufficient for normal use, the controller 2 recharges the battery B by a constant current/constant voltage charging method (CC/CV) each time the battery voltage of the battery B drops to the storage voltage in the standing stage.
With respect to the battery health management method of fig. 3, for example, for a rechargeable battery used in a terminal device, a charging and discharging procedure is continuously performed for a plurality of times to ensure that the battery capacity is sufficient for normal use. In each charge/discharge process, the battery voltage of the rechargeable battery is charged to a rated voltage by a constant current/constant voltage charging method (CC/CV). After the constant current/constant voltage charging method is finished, the battery is driven by the controller to discharge according to the expected discharge rate until the battery voltage drops from the rated voltage to the storage voltage. The battery enters a rest phase when the battery voltage of the battery drops to a storage voltage, wherein the expected discharge rate is greater than the rest discharge rate of the battery during the rest phase.
[ second embodiment ]
Fig. 4 is a flowchart of a battery health management method according to a second embodiment of the present application. In step S41, the battery B is charged by a constant current/constant voltage charging method (CC/CV) through the controller 2 so that the battery voltage of the battery B is increased from the initial voltage to the rated voltage.
In step S42, after the constant current/constant voltage charging method is finished, the battery B is driven to discharge according to the non-fixed expected discharge rate through the controller 2, so that the battery voltage of the battery B is decreased from the rated voltage to the storage voltage. In detail, the battery B is not discharged with a constant current, and the discharge current of the battery B is not a fixed value, for example, the discharge current of the battery B may continuously increase with time or continuously decrease with time.
In step S43, after the battery voltage of battery B decreases from the rated voltage to the storage voltage, battery B is left to discharge by itself according to the left discharge rate. Further, the non-fixed expected discharge rate in step S42 is larger than the stationary discharge rate when the battery is stationary in step S33.
In step S44, when the battery voltage of the battery B after standing is equal to the storage voltage, the battery B is recharged by a constant current/constant voltage charging method (CC/CV) through the controller 2 so that the battery voltage of the battery B is increased from the storage voltage to the rated voltage.
Fig. 5 is a graph of battery voltage versus time using the battery health management method of fig. 3. The controller 2 first charges the battery B by a constant current/constant voltage charging method (CCCV), which covers two periods, and in a first period (0-T1), the controller 2 first charges the battery B by the constant current of 1A, so that the battery voltage of the battery B is increased from an initial voltage (3.0V) to a rated voltage (4.0V). In a second period (T1 to T2), the controller 2 charges the battery B through a constant voltage of 4V to maintain the battery voltage of the battery B at a rated voltage (4.0V) for charging until the battery current of the battery B drops to a cut-off charging current (e.g., 0.5A).
In a third time period (T2-T3), the battery B is driven by the controller 2 to discharge according to the constant current of 1A, so that the battery voltage of the battery B is decreased from the rated voltage (4.0V) to the storage voltage (3.9V).
In the fourth period (T3 to T4), after the battery voltage of battery B decreases from the rated voltage to the storage voltage, battery B is left to discharge by itself. Specifically, when the battery B is at the beginning of the standing phase, the battery voltage of the battery B is first increased from the storage voltage (3.9V) to the first voltage (about 3.93V) instantaneously, and then the battery voltage of the battery B is decreased from the first voltage to the storage voltage (3.9V), and the sum of the first time interval to the fourth time interval is about one to two weeks, and the time duration is different according to the material of the battery core.
In a fifth time period (T4-T5), when the battery voltage of the battery B after standing is equal to the storage voltage, the battery B is recharged by a constant current/constant voltage charging method (CC/CV) through the controller 2, so that the battery voltage of the battery B is increased from the storage voltage (3.9V) to the rated voltage (4.0V).
[ advantageous effects of the embodiments ]
One of the benefits of the present application is that, through the battery health management method and the battery health management apparatus of the present application, the controller actively drives the battery to discharge according to the expected discharge rate, and the expected discharge rate is greater than the static discharge rate when the battery is static. Therefore, compared with the prior art that the battery is only discharged by self when in the standing stage, the time required for the voltage of the battery to be reduced from the rated voltage to the storage voltage can be greatly reduced. Therefore, the time that the battery voltage of the battery is higher than the storage voltage is greatly shortened, and the purpose of delaying the aging of the battery is achieved.
The above-mentioned embodiments are only preferred and practical embodiments of the present application, and not intended to limit the scope of the claims of the present application, so that all equivalent technical changes made by using the contents of the specification and the drawings of the present application are included in the scope of the claims of the present application.
Claims (10)
1. A battery health management method, comprising:
charging a battery to raise a battery voltage of the battery from an initial voltage to a rated voltage; after the battery voltage rises to the rated voltage, driving the battery to discharge according to a fixed expected discharge rate so as to reduce the battery voltage from the rated voltage to a storage voltage;
after the battery voltage is reduced to the storage voltage, the battery is placed still to enable the battery to discharge automatically according to a standing discharge rate, wherein the fixed expected discharge rate is larger than the standing discharge rate; and
when the battery voltage after the battery is settled is equal to the storage voltage, the battery is charged again to enable the battery voltage to rise from the storage voltage to the rated voltage.
2. The method of claim 1, wherein charging the battery to raise the battery voltage of the battery from the initial voltage to the nominal voltage comprises: charging the battery through a constant current until the battery voltage reaches the rated voltage; and charging the battery through a certain voltage after the battery voltage reaches the rated voltage, so that the battery voltage is maintained at the rated voltage for charging until a battery current of the battery is reduced to a stop charging current.
3. The method of claim 1, wherein during the resting of the battery, the battery voltage of the battery first increases from the storage voltage to a first voltage, and then the battery voltage of the battery decreases from the first voltage to the storage voltage.
4. The method of claim 1, wherein the discharging the battery according to the fixed expected discharge rate is performed by discharging the battery through a constant current until the battery voltage drops to the storage voltage.
5. A battery health management device, comprising:
a detection circuit for detecting a battery voltage and a battery current of a battery; and
a controller electrically connected to the detection circuit;
wherein the controller charges the battery to raise the battery voltage of the battery from an initial voltage to a rated voltage; after the battery voltage rises to the rated voltage, the controller drives the battery to discharge according to a fixed expected discharge rate so as to enable the battery voltage to be reduced from the rated voltage to a storage voltage; after the battery voltage drops to the storage voltage, standing the battery to enable the battery to automatically discharge according to a standing discharge rate, wherein the fixed expected discharge rate is greater than the standing discharge rate; and when the battery voltage after the battery is static is equal to the storage voltage, the controller recharges the battery to enable the battery voltage to rise from the storage voltage to the rated voltage.
6. The device of claim 5, wherein the controller charges the battery according to a constant current until the battery voltage reaches the rated voltage, and after the battery voltage reaches the rated voltage, the controller charges the battery according to a constant voltage to maintain the battery voltage at the rated voltage until a battery current of the battery drops to a cutoff charging current.
7. The device of claim 5, wherein the detection circuit comprises a first input terminal and a first output terminal, the controller comprises a second input terminal and a second output terminal, the first input terminal is electrically connected to the battery, the first output terminal is electrically connected to the second input terminal, and the second output terminal is electrically connected to the battery.
8. The device of claim 5, wherein the controller drives the battery to discharge according to the fixed expected discharge rate drives the battery to discharge through a constant current until the battery voltage drops to the storage voltage.
9. A battery health management method, comprising:
charging a battery to raise a battery voltage of the battery from an initial voltage to a rated voltage;
after the battery voltage rises to the rated voltage, driving the battery to discharge according to a non-fixed expected discharge rate so as to reduce the battery voltage from the rated voltage to a storage voltage; after the battery voltage is reduced to the storage voltage, the battery is stood to enable the battery to discharge automatically according to a standing discharge rate, wherein the non-fixed expected discharge rate is larger than the standing discharge rate; and
when the battery voltage after the battery is settled is equal to the storage voltage, the battery is charged again to enable the battery voltage to rise from the storage voltage to the rated voltage.
10. The method of claim 9, wherein the discharging the battery according to the non-fixed expected discharge rate is performed by discharging the battery through a discharge current that continuously increases with time or continuously decreases with time until the battery voltage drops to the storage voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110975478.6A CN115940308A (en) | 2021-08-24 | 2021-08-24 | Battery health management method and battery health management device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110975478.6A CN115940308A (en) | 2021-08-24 | 2021-08-24 | Battery health management method and battery health management device |
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| Publication Number | Publication Date |
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| CN115940308A true CN115940308A (en) | 2023-04-07 |
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| CN202110975478.6A Pending CN115940308A (en) | 2021-08-24 | 2021-08-24 | Battery health management method and battery health management device |
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- 2021-08-24 CN CN202110975478.6A patent/CN115940308A/en active Pending
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