TWI786769B - Battery health management method - Google Patents

Abstract

A battery health management method is presented and the method comprises steps described below. Charging a battery makes a battery voltage of the battery rises from an initial voltage to a charged voltage. Performing multiple step discharges sequentially on the battery until the battery voltage of the battery drops to a storage voltage, wherein the step discharge includes driving the battery to discharge according to a constant desired discharge rate and discharging the battery according a self-discharge rate, wherein the constant desired discharge rate is larger than a self-discharge rate. When the battery voltage is equal to the storage voltage, charging the battery increases the battery voltage from the storage voltage to the charged voltage.

Description

Battery Health Management Methods

The invention relates to a battery management method, in particular to a battery health management method capable of delaying battery aging time.

As people's demand for battery applications continues to increase, more attention is paid to battery capacity and life. Fig. 1 is the corresponding graph of the battery voltage and time of the battery of the conventional uninterruptible power supply system. The voltage (3.0V) rises to the rated voltage (4.0V). After the constant current/constant voltage charging is completed, the battery enters the static stage. During the static stage, the battery will discharge itself. When the battery voltage of the battery drops from the rated voltage to the recharge reference voltage (3.9V), the constant current will be used. /Constant voltage charging method (CCCV) recharges the battery so that the battery voltage of the battery rises from the recharge reference voltage to the rated voltage. Since it takes as long as 3 months for the battery voltage of the battery to drop from the rated voltage to the recharge reference voltage through self-discharge, the battery voltage of the battery is higher than the recharge reference voltage for a long time during the static stage. , which in turn leads to the rapid aging of the battery.

The technical problem to be solved by the present invention is to provide a battery health management method that can delay battery aging time in view of the deficiencies of the prior art.

In order to solve the above technical problems, one of the technical solutions adopted by the present invention is to provide a battery health management method, which includes: charging a battery 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, a number of step discharges are performed sequentially until the battery voltage drops to the storage voltage; wherein the step discharge Including driving the battery to discharge according to a fixed expected discharge rate and resting the battery to allow the battery to discharge itself according to a resting discharge rate, wherein the fixed expected discharge rate is greater than the resting discharge rate; the battery voltage at the battery is equal to the stored charging the battery to increase the battery voltage from the stored voltage to the rated voltage.

In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a battery health management method, which includes: charging a battery 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, a number of step discharges are performed in sequence until the battery voltage drops to the storage voltage; where the step discharge includes driving the battery to discharge according to a non-fixed expected discharge rate and standing the battery to make the battery discharge according to the static discharge rate. Self-discharge at a set discharge rate, wherein the non-fixed expected discharge rate is greater than the static discharge rate; when the battery voltage of the battery is equal to the storage voltage, the battery is charged to increase the battery voltage from the storage voltage to the rated voltage.

One of the beneficial effects of the present invention is that, through the battery health management method of the present invention, the controller drives the battery to perform multiple step discharges in order to keep the battery in a mild dynamic discharge state. The self-discharging during the time can greatly reduce the time required for the battery voltage to drop from the rated voltage to the storage voltage, and also shorten the self-discharging time of the battery at rest. In this way, the time during which the battery voltage of the battery is higher than the storage voltage is greatly shortened, thereby achieving the purpose of delaying battery aging.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings related to the present invention. However, the provided drawings are only for reference and description, and are not intended to limit the present invention.

A: Battery health management device

1: Detection circuit

11: The first input terminal

12: The first output terminal

2: Controller

21: The second input terminal

22: The second output terminal

B: battery

S31: Through the controller, use the constant current/constant voltage charging method to charge the battery, so that the battery voltage of the battery rises from the initial voltage to the rated voltage

S32: Through the controller, the battery is driven to perform multiple step discharges in sequence until the battery voltage of the battery drops to the storage voltage. Each step discharge includes the controller driving the battery to discharge according to a fixed expected discharge rate and resting the battery Make the battery self-discharge according to the static discharge rate

S33: Through the controller, use the constant current/constant voltage charging method to charge the battery again, so that the battery voltage rises from the storage voltage to the rated voltage

S41: Through the controller, use the constant current/constant voltage charging method to charge the battery, so that the battery voltage of the battery rises from the initial voltage to the rated voltage

S42: Through the controller, the battery is driven to perform multiple step discharges in sequence until the battery voltage of the battery drops to the storage voltage. Each step discharge includes the controller driving the battery to discharge according to a non-fixed expected discharge rate and standing still The battery allows the battery to discharge itself according to the resting discharge rate

S43: Through the controller, use the constant current/constant voltage charging method to charge the battery again, so that the battery voltage rises from the storage voltage to the rated voltage

FIG. 1 is a graph corresponding to battery voltage and time of a conventional uninterruptible power system battery.

FIG. 2 is a functional block diagram of a battery health management device applied to a battery according to an embodiment of the present invention.

FIG. 3 is a flow chart of the battery health management method according to the first embodiment of the present invention.

FIG. 4 is a flowchart of a battery health management method according to a second embodiment of the present invention.

FIG. 5 is a corresponding graph of battery voltage versus time using the battery health management method of FIG. 3 .

The implementation of the "battery health management method" disclosed in the present invention is described below through specific specific examples. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only for simple illustration, and are not drawn according to the actual size, which is stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention.

It should be understood that although terms such as "first", "second", and "third" may be used herein to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are mainly used to distinguish one element from another element, or one signal from another signal. In addition, the term "or" used herein may include any one or a combination of more of the associated listed items depending on the actual situation.

In order to solve the problem of battery aging, the present invention provides a battery health management method. After the battery voltage of the battery is charged to the rated voltage through the constant current/constant voltage charging method, multiple step discharges are performed sequentially to keep the battery in a moderate state. Dynamic discharge state, where the step discharge includes driving the battery to discharge according to the expected discharge rate and the battery to discharge according to the static discharge rate, by This reduces the time required for the battery voltage to drop from the rated voltage to the storage voltage, and greatly shortens the time when the battery voltage of the battery is higher than the storage voltage.

FIG. 2 is a functional block diagram of a battery health management device adapted to a battery according to an embodiment of the present invention. As shown in FIG. 2 , the battery health management device A includes a detection circuit 1 and a controller 2 . The detection circuit 1 includes a first input end 11 and a first output end 12 , and the controller 2 includes a second input end 21 and a second output end 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 , whereby the controller 2 obtains the battery voltage and battery current of the battery B. The second output terminal 22 of the controller 2 is electrically connected to the battery B and executes the battery health management method for the battery B according to the battery voltage and the battery current.

Specifically, the type of the battery B that the battery health management device A is applicable to is not limited, and the battery B can be, for example, a battery of an uninterruptible power system or a fuel cell. The controller 2 can be, for example, a microprocessor (Microprocessor) or a digital signal processor (Digital Signal Processor, DSP) or other similar devices or a combination of these devices. Regarding the embodiment of the detection circuit 1 and the controller 2, the detection circuit 1 and the controller 2 can be two different chips, or integrated into the same chip.

Regarding other embodiments of the battery health management device A, the battery health management device A may further include a first wireless communication module and a second wireless communication module, and the detection circuit 1 and the controller 2 are respectively electrically connected to the first wireless communication module. The wireless communication module and the second wireless communication module, after the detection circuit 1 obtains the battery voltage and battery current of the battery B, through the communication connection between the first wireless communication module and the second wireless communication module, the controller 2 obtains the battery B's battery voltage and battery current.

FIG. 3 is a flow chart of the battery health management method according to the first embodiment of the present invention. In step S31, through the controller 2, the battery B is charged by a constant current/constant voltage charging method (CCCV), so that the battery voltage of the battery B rises from an initial voltage to a rated voltage. Regarding the constant current/constant voltage charging method, the controller 2 first charges battery B through a constant current until the battery voltage of battery B rises from the initial voltage up to the rated voltage. Next, the controller 2 charges the battery B through 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 drops to the cut-off charging current. As for the constant current and constant voltage, it is moderately adjusted according to the usage requirements.

In step S32 , after the constant current/constant voltage charging method is completed, the controller 2 drives the battery B to perform multiple step discharges in sequence until the battery voltage of the battery B drops to the storage voltage. Each execution of the step discharge includes the controller 2 driving the battery B to discharge according to a fixed expected discharge rate and making the battery B enter a static stage. During the static stage, battery B will discharge itself according to the static discharge rate. The battery B enters the static stage after the controller 2 drives the battery B to discharge according to a fixed expected discharge rate, and the fixed expected discharge rate is greater than the static discharge rate. To be more specific, during each step discharge, the controller 2 drives the battery B to discharge according to the constant current. After the controller 2 drives the battery B to discharge according to the constant current, the battery B enters the static stage. During the rest period of the battery B, the battery voltage of the battery B rises instantaneously by a voltage difference, and then the battery voltage of the battery B decreases continuously until the rest period ends.

In step S33, when the battery voltage of battery B drops to the storage voltage, through the controller 2, the constant current/constant voltage charging method (CC/CV) is used to charge the battery B again, so that the battery voltage rises from the storage voltage to the rated voltage. Voltage. Specifically, in order to ensure that the power of battery B is sufficient for normal use, every time the battery voltage of battery B drops from the rated voltage to the storage voltage, the controller 2 will use the constant current/constant voltage charging method (CC/CV) to charge the battery B Charge again.

With regard to the battery health management method in FIG. 3 , for example, for the rechargeable battery used by the terminal device, the charging and discharging procedures are continuously performed multiple times to ensure that the battery has sufficient power for normal use. In each charging and discharging procedure, the battery voltage of the rechargeable battery is charged to the rated voltage by using the constant current/constant voltage charging method (CC/CV). After the constant current/constant voltage charging method is completed, multiple step discharges are sequentially performed 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 invention. in step S41, through the controller 2, the battery B is charged by a constant current/constant voltage charging method (CC/CV), so that the battery voltage of the battery B rises from an initial voltage to a rated voltage.

In step S42 , after the constant current/constant voltage charging method is completed, the controller 2 drives the battery B to perform multiple step discharges in sequence until the battery voltage of the battery B drops to the storage voltage. Each execution of step discharge includes the controller 2 driving the battery B to discharge according to the non-fixed expected discharge rate and resting the battery B to discharge the battery B according to the resting discharge rate, wherein the resting stage of the battery B is driven by the controller 2 After battery B is discharged according to a non-fixed expected discharge rate, and the non-fixed expected discharge rate is greater than the static discharge rate. Regarding the non-fixed expected discharge rate, it means that the battery B is not discharged at 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 continue to increase or decrease over time.

In step S43, when the battery voltage of battery B drops to the storage voltage, through the controller 2, the constant current/constant voltage charging method (CC/CV) is used to charge the battery B again, so that the battery voltage rises from the storage voltage to the rated voltage Voltage.

FIG. 5 is a corresponding graph of battery voltage versus time using the battery health management method of FIG. 3 . Controller 2 first uses the constant current/constant voltage charging method (CCCV) to charge battery B, which covers two periods. In the first period (0~T1), controller 2 first charges battery B through a constant current of 1A. Charging is performed so that the battery voltage of battery B rises from the initial voltage (3.0V) to the rated voltage (4.0V). In the second period (T1~T2), the controller 2 charges the battery B through a constant voltage of 4V, so that the battery voltage of the battery B is maintained at the rated voltage (4.0V) for charging, until the battery current of the battery B drops to the cut-off charging current (for example, 0.5A).

In the third period (T2~T3), the controller 2 drives the battery B to perform multiple step discharges in sequence until the battery voltage of the battery B drops from the rated voltage (4.0V) to the storage voltage (3.9V). 5 shows that the number of step discharges is 8, but the present invention is not limited thereto. When step discharge is performed each time, the controller 2 first drives battery B to discharge at a constant current of 1A for 1 minute (S1), and then makes battery B It enters the resting stage for about 1 hour (S2). If you zoom in on the resting stage (S2) of battery B in Figure 5, in fact, the battery voltage of battery B rises instantly by a voltage difference, and then battery B discharges itself . The sum of the first period to the third period in Figure 5 lasts about two days, and the length of the aforementioned three periods will vary depending on the battery material and battery capacity.

In the fourth period (T3~T4), when the battery voltage of battery B drops from the rated voltage to the storage voltage through multiple step discharges, through the controller 2, the constant current/constant voltage charging method (CC/CV) is used to charge the battery. Battery B is recharged so that the battery voltage of battery B rises from the storage voltage (3.9V) to the rated voltage (4.0V).

To sum up, the beneficial effect of the battery health management method of the present invention is at least that the controller drives the battery to perform multiple step discharges in sequence so that the battery is always in a mild dynamic discharge state. The self-discharge during storage greatly reduces the time required for the battery voltage to drop from the rated voltage to the storage voltage, and also shortens the self-discharge time of the battery at rest. In this way, the time during which the battery voltage of the battery is higher than the storage voltage is greatly shortened, thereby achieving the purpose of delaying battery aging.

The content disclosed above is only a preferred feasible embodiment of the present invention, and does not therefore limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made by using the description and drawings of the present invention are included in the application of the present invention. within the scope of the patent.

S31: Through the controller, use the constant current/constant voltage charging method to charge the battery, so that the battery voltage of the battery rises from the initial voltage to the rated voltage

S32: Through the controller, the battery is driven to perform multiple step discharges in sequence until the battery voltage of the battery drops to the storage voltage. The step discharge includes the controller driving the battery to discharge according to a fixed expected discharge rate and standing the battery to make the battery Self-discharge according to resting discharge rate

S33: Through the controller, use the constant current/constant voltage charging method to charge the battery again, so that the battery voltage rises from the storage voltage to the rated voltage

Claims (7)

A battery health management method, comprising: charging a battery so that a battery voltage of the battery rises from an initial voltage to a rated voltage; after the battery voltage rises to the rated voltage, sequentially performing a plurality of step discharges until The battery voltage drops to a storage voltage; wherein the step discharge includes driving the battery to discharge according to a fixed expected discharge rate and standing the battery so that the battery discharges itself according to a static discharge rate, wherein the fixed expected discharge rate The discharge rate is greater than the static discharge rate; and when the battery voltage of the battery drops to the storage voltage, the battery is charged so that the battery voltage rises from the storage voltage to the rated voltage. The battery health management method according to claim 1, wherein charging the battery to increase the battery voltage of the battery from the initial voltage to the rated voltage includes: charging the battery with a certain current until the battery voltage reaches the rated voltage; And after the battery voltage reaches the rated voltage, the battery is charged with a certain voltage so that the battery voltage is maintained at the rated voltage until a battery current of the battery drops to a cut-off charging current. The battery health management method according to claim 1, wherein driving the battery to discharge according to the fixed expected discharge rate is driving the battery to discharge according to a certain current. The battery health management method as described in Claim 1, wherein after the battery is driven to discharge according to the fixed expected discharge rate, the battery is left to discharge automatically according to the static discharge rate. A battery health management method, comprising: charging a battery to increase a battery voltage of the battery from an initial voltage to a rated voltage; After the battery voltage rises to the rated voltage, sequentially perform a plurality of step discharges until the battery voltage drops to a storage voltage; wherein the step discharge includes driving the battery to discharge according to a non-fixed expected discharge rate and resting the battery to self-discharge the battery according to a resting discharge rate, wherein the non-fixed expected discharge rate is greater than the resting discharge rate; and charging the battery when the battery voltage of the battery drops to the stored voltage so that The battery voltage rises from the storage voltage to the rated voltage. The battery health management method according to claim 5, wherein driving the battery to discharge according to the non-fixed expected discharge rate is driving the battery to discharge through a discharge current that increases or decreases with time. The battery health management method as described in claim 5, wherein after the battery is driven to discharge according to the non-fixed expected discharge rate, the battery is allowed to stand still so that the battery discharges itself according to the rest discharge rate.

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