TWI786770B - Battery health management method and battery health management device - Google Patents

Abstract

A battery health management method is presented and the method comprises steps described below. Charging the battery makes a battery voltage of the battery rises from an initial voltage to a rated voltage. Driving the battery to discharge based on a constant desired discharge rate makes the battery voltage drops from the rated voltage to a storage voltage after the battery voltage rises to the rated voltage. After the battery voltage drops to the storage voltage, the battery discharges by itself according a self-discharge rate and the desired discharge rate is larger than the self-discharge rate, and when the battery voltage is equal to the storage voltage after the battery discharges by itself, charging the battery increases the battery voltage from the storage voltage to the rated voltage. Moreover, a battery health management device is presented.

Description

Battery health management method and battery health management device

The invention relates to a battery management method and a battery management device, in particular to a battery health management method and a battery health management device 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. Figure 1 is a graph corresponding to the battery voltage and time of a battery in a conventional uninterruptible power supply system. The initial voltage (3.0V) is raised 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) through self-discharge, the The constant current/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 and a battery health management device that can delay battery aging time in view of the deficiencies in 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 a battery voltage of the battery rises from an initial voltage to a rated voltage; After the battery voltage rises to the rated voltage, the battery is driven to discharge according to a fixed expected discharge rate, so that the battery voltage drops from the rated voltage to a storage voltage; after the battery voltage drops to the storage voltage, the battery is left standing the battery self-discharges the battery according to a resting discharge rate with a fixed expected discharge rate greater than the resting discharge rate; and recharging the battery when the battery voltage after the resting is equal to the stored voltage so that The battery voltage rises from the storage 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 device, which includes a detection circuit and a controller. The detection circuit is used to detect a battery voltage and a battery current of a battery, and the controller is electrically connected to the detection circuit, wherein the controller is used to execute a battery health management method, and the battery health management method includes: charging the 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, driving the battery to discharge according to a fixed expected discharge rate so that the battery voltage increases from the rated voltage drops to a storage voltage; after the voltage of the battery drops to the storage voltage, resting the battery causes the battery to self-discharge according to a resting discharge rate, and the fixed expected discharge rate is greater than the resting discharge rate; and When the battery voltage is equal to the stored voltage after the battery is left standing, the battery is recharged so that the battery voltage rises 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 a battery voltage of the battery rises from an initial voltage to a rated voltage; After the battery voltage rises to the rated voltage, the battery is driven to discharge according to a non-fixed expected discharge rate, so that the battery voltage drops from the rated voltage to a storage voltage; after the battery voltage drops to the storage voltage, static placing the battery so that the battery discharges itself according to a resting discharge rate, and the variable expected discharge rate is greater than the resting discharge rate; and recharging the battery when the battery voltage after the resting is equal to the stored voltage, to increasing 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 and battery health management device of the present invention, the controller actively drives the battery to discharge according to the expected discharge rate, and the expected discharge rate is greater than the resting discharge rate of the battery. In this way, compared with the past, only relying on the self-discharge of the battery during the static stage, the time required for the battery voltage to drop from the rated voltage to the storage voltage can be greatly reduced. 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.

The following are specific examples to illustrate the implementation of the "battery health management method and battery health management device" disclosed in the present invention. 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 and a battery health management device. After charging the battery at a constant current/constant voltage, the controller first actively drives the battery to discharge according to the expected discharge rate, and then the battery static Self-discharge according to the static discharge rate when placed, because the expected discharge rate is greater than the static discharge rate, so as to reduce the time required for the battery voltage to drop from the rated voltage to the storage voltage, and greatly shorten 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 Figure 2, the battery health management device 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 An 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 so as to detect the battery voltage and 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 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 that the battery health management device A is applicable to is not limited, and the battery can 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 (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 in the same chip, for example.

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, and the first wireless communication module and the second wireless communication module are connected in communication with each other. After the detection circuit 1 obtains the battery voltage and battery current of the battery B, the controller 2 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.

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 constant current/constant voltage charging method (CC/CV), so that the battery voltage of the battery B rises from the initial voltage to the rated voltage. Regarding 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. 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 drops to the cut-off charging current. As for the constant current and constant voltage during charging, it is moderately adjusted according to the needs of use.

In step S32, after the constant current/constant voltage charging method is completed, the controller 2 drives the battery B to discharge according to a fixed expected discharge rate, so that the battery voltage of the battery B drops from the rated voltage to the storage voltage. In detail, after the constant current/constant voltage charging method is completed, the controller 2 drives the battery B to discharge according to the constant current, so that the battery voltage of the battery B drops from the rated voltage to the storage voltage.

In step S33 , after the battery voltage of the battery B drops from the rated voltage to the storage voltage, the battery B is allowed to stand still to discharge itself according to the resting discharge rate. In detail, when the rest period of the battery B starts, the battery voltage of the battery B instantly rises by a voltage difference from the storage voltage, and then the battery voltage of the battery B continues to drop until the battery voltage of the battery B is equal to the storage voltage.

Furthermore, the fixed expected discharge rate in step S32 is greater than the resting discharge rate in step S33.

In step S34, when the battery voltage of the battery B after standing still is equal to the stored voltage, the battery B is recharged by the constant current/constant voltage charging method (CC/CV) through the controller 2, so that the battery voltage of the battery B Rising from storage voltage to rated 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 to the storage voltage during the static stage, the controller 2 will use the constant current/constant voltage charging method (CC/CV) to charge the battery B is charged 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, the controller drives the battery to discharge according to the expected discharge rate until the battery voltage drops from the rated voltage to the storage voltage. When the battery voltage of the battery drops to the storage voltage, the battery enters the rest period, wherein the expected discharge rate is greater than the rest discharge rate of the battery during the rest period.

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 constant current/constant voltage charging method (CC/CV), so that the battery voltage of the battery B rises from the initial voltage to the rated voltage.

In step S42, after the constant current/constant voltage charging method is completed, the controller 2 drives the battery B to discharge according to a non-fixed expected discharge rate, so that the battery voltage of the battery B drops 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 or decrease with time.

In step S43 , after the battery voltage of the battery B drops from the rated voltage to the stored voltage, the battery B is allowed to stand still to discharge itself according to the resting discharge rate. Furthermore, the non-fixed expected discharge rate in step S42 is greater than the resting discharge rate when the battery is resting in step S33.

In step S44, when the battery voltage of the battery B after standing still is equal to the storage voltage, the battery B is recharged by the constant current/constant voltage charging method (CC/CV) through the controller 2, so that the battery voltage of the battery B Rising from storage voltage to rated 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 discharge according to the constant current of 1A, so that the battery voltage of the battery B drops from the rated voltage (4.0V) to the storage voltage (3.9V).

In the fourth period (T3~T4), after the battery voltage of the battery B drops from the rated voltage to the storage voltage, the battery B is allowed to stand still to discharge itself. In detail, when the battery B starts the rest period, the battery voltage of the battery B rises instantaneously from the storage voltage (3.9V) to the first voltage (about 3.93V), and then the battery voltage of the battery B drops from the first voltage to Store the voltage (3.9V), and the sum of the first period to the fourth period lasts about one to two weeks, and the length of time will also vary depending on the battery material.

In the fifth period (T4~T5), when the battery voltage after battery B is equal to the storage voltage, the battery B is recharged by the constant current/constant voltage charging method (CC/CV) through the controller 2, so that The battery voltage of battery B rises from the storage voltage (3.9V) to the rated voltage (4.0V).

One of the beneficial effects of the present invention is that, through the battery health management method and battery health management device of the present invention, 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 at rest . In this way, compared with the past, only relying on the self-discharge of the battery during the static stage, the time required for the battery voltage to drop from the rated voltage to the storage voltage can be greatly reduced. 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.

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: Drive the battery to discharge according to a fixed expected discharge rate through the controller, so that the battery voltage of the battery drops from the rated voltage to the storage voltage

S33: Let the battery stand still to discharge itself according to the resting discharge rate

S34: When the battery voltage is equal to the storage voltage after the battery is left standing, the battery is recharged by the constant current/constant voltage charging method through the controller, so that the battery voltage of the battery 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 discharge according to a non-fixed expected discharge rate, so that the battery voltage of the battery drops from the rated voltage to the storage voltage

S43: Let the battery stand still to discharge itself according to the resting discharge rate

S44: When the battery voltage is equal to the storage voltage after the battery is left standing, recharge the battery by using the constant current/constant voltage charging method through the controller, so that the battery voltage of the battery 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 .

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: Drive the battery to discharge according to a fixed expected discharge rate through the controller, so that the battery voltage of the battery drops from the rated voltage to the storage voltage

S33: Let the battery stand still to discharge itself according to the resting discharge rate

S34: When the battery voltage is equal to the storage voltage after the battery is left standing, the battery is recharged by the constant current/constant voltage charging method through the controller, so that the battery voltage of the battery rises from the storage voltage to the rated voltage

Claims (5)

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, driving the battery according to a fixed expected discharge rate Discharging is performed so that the battery voltage drops from the rated voltage to a storage voltage; after the battery voltage drops to the storage voltage, the battery is left standing, and the battery voltage of the battery is first changed from the stored voltage is first increased to a first voltage, and then the battery voltage of the battery is decreased from the first voltage to the stored voltage according to a resting discharge rate, wherein the fixed expected discharge rate is greater than the resting discharge rate; and When the voltage of the battery after the battery is at rest is equal to the storage voltage, the battery is recharged to increase the voltage of the battery 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 through a certain current until the battery voltage drops to the storage voltage. 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, driving the battery to discharge according to a non-fixed expected discharge rate so that the battery voltage drops from the rated voltage to a storage voltage; after the battery voltage drops to the storage voltage , put the battery at rest, during the process of leaving the battery at rest, the battery voltage of the battery first rises from the storage voltage to a first voltage, and then the battery voltage of the battery increases from the first voltage according to a resting discharge rate a voltage drop to the stored voltage, wherein the non-fixed expected discharge rate is greater than the resting discharge rate; and when the battery voltage after resting the battery is equal to the stored voltage, recharging the battery so that the battery voltage increases from the The storage voltage is raised to this rated voltage. The battery health management method as described in claim 4, 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 continuously increases or decreases with time, until the battery voltage drops to the storage voltage.

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