CN115719981A - 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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- CN115719981A CN115719981A CN202110975455.5A CN202110975455A CN115719981A CN 115719981 A CN115719981 A CN 115719981A CN 202110975455 A CN202110975455 A CN 202110975455A CN 115719981 A CN115719981 A CN 115719981A
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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
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Abstract
The application provides a battery health management method, which comprises the following steps. The battery is charged so that the battery voltage of the battery rises from an initial voltage to a rated voltage. After the battery voltage rises to the rated voltage, step discharge is sequentially performed a plurality of times until the battery voltage drops to the storage voltage. The step discharge comprises driving the battery to discharge according to a fixed expected discharge rate and standing the battery to enable the battery to discharge automatically according to a standing discharge rate, wherein the expected discharge rate is greater than the standing discharge rate. When the battery voltage of the battery is equal to the storage voltage, the battery is charged so that the battery voltage rises 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 for battery applications, more attention is paid to battery capacity and service life. 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 the battery voltage of the battery from an initial voltage to a rated voltage; and after the battery voltage rises to the rated voltage, sequentially executing a plurality of step discharges until the battery voltage drops to the storage voltage; wherein the step discharging comprises driving the battery to discharge according to a fixed expected discharging rate and standing the battery to enable the battery to automatically discharge according to a standing discharging rate, wherein the fixed expected discharging rate is greater than the standing discharging rate; when the battery voltage of the battery 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.
Optionally, 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 stop charging current.
Optionally, during the process of standing the battery, the driving the battery to discharge according to the fixed expected discharge rate drives the battery to discharge according to a certain current.
Optionally, after the battery is driven to discharge according to the fixed expected discharge rate, the battery is left to discharge by itself according to the left discharge rate.
The application also discloses battery health management device, its characterized in that includes: the detection circuit is used 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, sequentially executing a plurality of step discharges until the battery voltage drops to a storage voltage; wherein the step discharging comprises the controller driving the battery to discharge according to a fixed expected discharge rate and standing the battery to enable the battery to automatically discharge according to a standing discharge rate; when the battery voltage of the battery is reduced to the storage voltage, the controller charges the battery so that the battery voltage is increased from the storage voltage to the rated voltage.
Optionally, the controller charges the battery according to a certain 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 certain voltage so as to maintain the battery voltage at the rated voltage for charging until a battery current of the battery drops to a cut-off charging current.
Optionally, 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.
The application also discloses a battery health management method, which is characterized by comprising the following steps: 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, sequentially executing a plurality of step discharges until the battery voltage drops to a storage voltage; wherein the step discharging comprises driving the battery to discharge according to a non-fixed expected discharging rate and standing the battery to enable the battery to discharge automatically according to a standing discharging rate, wherein the non-fixed expected discharging rate is greater than the standing discharging rate; and when the battery voltage of the battery is reduced to the storage voltage, charging the battery so as to enable the battery voltage to be increased from the storage voltage to the rated voltage.
Optionally, 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.
Optionally, after the battery is driven to discharge according to the non-fixed expected discharge rate, the battery is left to discharge by itself according to the left discharge rate.
One of the advantages of the present application is that, through the battery health management method and the battery health management apparatus of the present application, the battery performs multiple step discharges in sequence to make the battery continuously in a relaxed dynamic discharge state, compared with the conventional self-discharge only when the battery is in a static state, the time required by the battery voltage of the battery to drop from the rated voltage to the storage voltage is greatly reduced, and the self-discharge time in the static state of the battery is also shortened. 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, 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 used primarily 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 apparatus, after charging a battery voltage of a battery to a rated voltage through a constant current/constant voltage charging method, performing step discharge for a plurality of times in sequence to keep the battery in a relaxed dynamic discharge state, wherein the step discharge includes driving the battery to discharge according to an expected discharge rate and driving the battery to discharge according to a standing discharge rate, thereby reducing a time required for the battery voltage to decrease from the rated voltage to a storage voltage, and greatly shortening a time for the battery voltage of the battery to be higher than the storage voltage.
[ 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 the battery B so as to detect the battery voltage and the 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 type of the battery B to which the battery health management device a is applied is not limited, and the battery B may be, for example, a battery of an uninterruptible power system or a fuel cell. The controller 2 may be, for example, a Microprocessor (Microprocessor) or a Digital Signal Processor (DSP), etc., 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 two different chips respectively, or integrated on the same chip.
In another embodiment 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, 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 (CCCV) 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 so that the battery voltage of the battery B is maintained at the rated voltage for charging until the battery current of the battery B decreases to the off-charging current. The magnitude of the constant current and the constant voltage are properly adjusted according to the requirement of the user.
In step S32, after the constant current/constant voltage charging method is finished, the controller 2 drives the battery B to sequentially perform step discharging for a plurality of times until the battery voltage of the battery B is reduced to the storage voltage. Each step of discharging includes the controller 2 driving the battery B to discharge according to a fixed expected discharge rate and causing the battery B to enter the standing phase. And the battery B can automatically discharge according to the standing discharge rate in the standing stage. Wherein, the battery B enters the standing stage after the controller 2 drives the battery B to discharge according to the fixed expected discharge rate, and the fixed expected discharge rate is greater than the standing discharge rate. In detail, each time step discharge is performed, the battery B is driven to discharge according to a constant current through the controller 2, after the controller 2 finishes driving the battery B to discharge according to the constant current, the battery B enters a standing phase, in the standing phase of the battery B, the battery voltage of the battery B is increased by a voltage difference instantly, and then the battery voltage of the battery B is continuously decreased until the standing phase is finished.
In step S33, when the battery voltage of the battery B decreases 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 increases 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 from the rated voltage to the storage voltage.
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, step discharging is sequentially performed a plurality of times until the battery voltage drops from the rated voltage to the storage voltage.
Fig. 4 is a flowchart of a battery health management method according to a second embodiment of the present application. In step S41, battery B is charged by a constant current/constant voltage charging method (CC/CV) through controller 2 so that the battery voltage of battery B is raised from the initial voltage to the rated voltage.
In step S42, after the constant current/constant voltage charging method is finished, the controller 2 drives the battery B to sequentially perform the step discharging for a plurality of times until the battery voltage of the battery B is reduced to the storage voltage. Each step of discharging includes that the controller 2 drives the battery B to discharge according to the non-fixed expected discharging rate and the battery B is allowed to stand to discharge according to the standing discharging rate, wherein in the standing stage of the battery B, after the controller 2 drives the battery B to discharge according to the non-fixed expected discharging rate, the non-fixed expected discharging rate is greater than the standing discharging rate. With respect to the non-fixed expected discharge rate, it is meant that battery B is not discharged at a constant current, and the discharge current of battery B is not a fixed value, for example, the discharge current of battery B may continuously increase or continuously decrease over time.
In step S43, when the battery voltage of the battery B decreases 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 increases 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 a 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 the 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) until the battery current of the battery B drops to a cutoff charging current (e.g., 0.5A).
In a third time period (T2-T3 days), the controller 2 drives the battery B to sequentially perform step discharge for a plurality of times until the battery voltage of the battery B decreases from the rated voltage (4.0V) to the storage voltage (3.9V). The number of step discharges is shown as 8 in fig. 5, but the present application is not limited thereto. Each time step discharge is performed, controller 2 first drives battery B to discharge for 1 minute at a constant current of 1A (S1), and then brings battery B into the standing phase for about 1 hour (S2), and if the standing phase of battery B in fig. 5 (S2) is enlarged, the battery voltage of battery B actually instantaneously rises by a voltage difference, and then battery B discharges itself. The sum of the first period to the third period in fig. 5 is about two days, and the lengths of the three periods vary according to the cell materials and the cell capacities.
In a fourth period (T3 to T4), when the battery voltage of the battery B decreases from the rated voltage to the storage voltage through the multi-step discharge, the battery B is recharged by the controller 2 by a constant current/constant voltage charging method (CC/CV) so that the battery voltage of the battery B increases from the storage voltage (3.9V) to the rated voltage (4.0V).
[ advantageous effects of the embodiments ]
One of the advantages of the present application is that, through the battery health management method and the battery health management apparatus of the present application, the battery is driven to perform the step discharge for multiple times in sequence, so that the battery is always in the relaxed dynamic discharge state, compared with the conventional self-discharge only when the battery is in a static state, the time required by the voltage of the battery to decrease from the rated voltage to the storage voltage is greatly reduced, and the self-discharge time of the battery in the static state is also shortened. 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 possible examples of the present disclosure, and not intended to limit the scope of the present disclosure, so that all equivalent technical changes made by using the contents of the specification and drawings are included in the scope of the present disclosure.
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, sequentially executing a plurality of step discharges until the battery voltage drops to a storage voltage;
wherein the step discharging comprises driving the battery to discharge according to a fixed expected discharging rate and standing the battery to enable the battery to discharge automatically according to a standing discharging rate, wherein the fixed expected discharging rate is greater than the standing discharging rate; and
when the battery voltage of the battery is reduced to the storage voltage, the battery is charged so that the battery voltage is increased 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 the discharging the battery according to the fixed expected discharge rate is driven by a constant current.
4. The method of claim 1, wherein after the battery is driven to discharge according to the fixed expected discharge rate, the battery is left to discharge by itself according to the left discharge rate.
5. A battery health management device, comprising:
the detection circuit is used 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 sequentially executes step discharge for a plurality of times until the battery voltage drops to a storage voltage; wherein the step discharging comprises the controller driving the battery to discharge according to a fixed expected discharge rate and standing the battery to enable the battery to automatically discharge according to a standing discharge rate; when the battery voltage of the battery is reduced to the storage voltage, the controller charges the battery so that the battery voltage is increased 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. 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, sequentially executing a plurality of step discharges until the battery voltage drops to a storage voltage;
wherein the step discharging comprises driving the battery to discharge according to a non-fixed expected discharging rate and standing the battery to enable the battery to discharge automatically according to a standing discharging rate, wherein the non-fixed expected discharging rate is greater than the standing discharging rate; and
when the battery voltage of the battery is reduced to the storage voltage, the battery is charged so that the battery voltage is increased from the storage voltage to the rated voltage.
9. The method of claim 8, wherein the discharging the battery according to the non-fixed expected discharge rate is driven by a discharging current that increases continuously with time or decreases continuously with time.
10. The method of claim 8, wherein after the battery is driven to discharge according to the non-fixed expected discharge rate, the battery is left to discharge by itself according to the left discharge rate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110975455.5A CN115719981A (en) | 2021-08-24 | 2021-08-24 | Battery health management method and battery health management device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110975455.5A CN115719981A (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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| CN115719981A true CN115719981A (en) | 2023-02-28 |
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| CN202110975455.5A Pending CN115719981A (en) | 2021-08-24 | 2021-08-24 | Battery health management method and battery health management device |
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- 2021-08-24 CN CN202110975455.5A patent/CN115719981A/en active Pending
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