TWI784737B - Battery health management method and battery health management device - Google Patents

Abstract

A battery health management method comprises: performing a charge-discharge process having multiple step discharges on a battery; determining whether a step discharge times is below a threshold; increasing an expected charging voltage of the charge-discharge process when the step discharge times is lower than the threshold; keeping the expected charging voltage of the charge-discharge process when the step discharge times is not lower than the threshold; determining whether the expected charging voltage is equal to or greater than a rated charging voltage; performing the charge-discharge process according to the rated charging voltage when the expected charging voltage is equal to or greater than the rated charging voltage; and performing the charge-discharge process according to the expected charging voltage when the expected charging voltage is less than the rated charging 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 increasing battery capacity.

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) rises to the rated voltage (4.1V). 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.

Regarding the state of health (State of Health; SOH) of the battery, the new product of the battery is regarded as a 100% healthy state. With the use of the battery cycle charge and discharge, the capacity and performance of the battery will gradually deteriorate, so the estimated value of SOH It will gradually decrease from 100%, and finally to SOH = 0%, which means it is completely unusable. But generally, the battery will not be replaced until the battery is completely unable to discharge. Therefore, one SOH indication method is to warn the user to replace the battery as soon as possible when the SOH is lower than a threshold value.

The technical problem to be solved by the present invention is to provide a battery health management method and a battery health management device capable of increasing battery capacity 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: performing a charge and discharge program on the battery, the charge and discharge program includes multiple step discharges; judging the step discharge of the battery Whether the number of times is lower than the threshold value; when the number of step discharges is lower than the threshold value, increase the expected charging voltage of the charge and discharge program; when the number of step discharges is not lower than the threshold value, maintain the expected charging voltage; determine whether the expected charging voltage is greater than or Equal to the rated charging voltage; when the expected charging voltage is greater than or equal to the rated charging voltage, perform the charging and discharging procedure on the battery according to the rated charging voltage; and when the expected charging voltage is less than the rated charging voltage, perform the charging and discharging procedure on the battery according to the expected charging 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 first detection circuit, a second module and a controller. The first detection circuit is used for detecting the battery voltage and battery current of the battery. The second module is used to detect the step discharge times of the battery. The controller is electrically connected to the first detection circuit, the second module and the battery. The controller is used to execute the health management method, and the health management method includes: performing a charging and discharging program on the battery, and the charging and discharging program includes multiple step discharges; judging whether the number of step discharges of the battery is lower than a threshold value; when the number of step discharges If it is lower than the threshold value, increase the expected charging voltage of the charging and discharging procedure; when the number of step discharges is not lower than the threshold value, maintain the expected charging voltage; judge whether the expected charging voltage is greater than or equal to the rated charging voltage; when the expected charging voltage is greater than or equal to the rated charging voltage Charging voltage, performing a charging and discharging procedure on the battery according to the rated charging voltage; and performing a charging and discharging procedure on the battery according to the expected charging voltage when the expected charging voltage is lower than the rated charging voltage.

One of the beneficial effects of the present invention is that, through the battery health management method and battery health management device provided by the present invention, whenever the number of step discharges of the battery is lower than the threshold value, it means that the current state of health of the battery is not good, so through Increase the voltage level of the expected charging voltage, so that the number of step discharges of the battery exceeds the threshold. In this way, the time during which the number of step discharges is higher than the threshold value can be greatly increased, thereby improving the health status of the battery. In addition, when the battery is discharged according to the expected discharge rate greater than the static discharge rate, the time required for the battery voltage to drop from the expected charging 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, and the purpose of delaying battery aging can also be achieved.

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.

The battery's state of health (State of Health; SOH) will continue to decline as the number of charge and discharge increases, and the number of step discharges of the battery can reflect the current state of health of the battery. Therefore, when the number of step discharges of the battery is lower than the threshold value, it means that the battery is in poor health and cannot be used normally. At this time, the voltage level of the expected charging voltage in the charging and discharging procedure must be increased, and the battery is charged and discharged according to the increased expected charging voltage. In this way, the step discharge times of the battery can be increased to exceed the threshold value. When the expected charging voltage is higher than the rated charging voltage after several boosts, the battery is charged and discharged according to the rated charging voltage.

[first embodiment]

FIG. 2 is a functional block diagram of a battery health management device provided by an embodiment of the present invention. As shown in Figure 2, the battery health management device A includes a first detection circuit 1, a second module 2 and a controller 3, the first detection circuit 1 includes a first input terminal 11 and a first output Terminal 12 , the first input terminal 11 of the first 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 second module 2 includes a second input terminal 21 and a second output terminal 22 , the second input terminal 21 of the second module 2 is electrically connected to the battery B, so as to detect the step discharge times of the battery B. The controller 3 includes a third input terminal 31 , a fourth input terminal 32 and a third output terminal 33 . The third input terminal 31 and the fourth input terminal 32 of the controller 3 are respectively electrically connected to the first output terminal 12 of the first detection circuit 1 and the second output terminal 22 of the second module 2, whereby the controller 3 Obtain the battery voltage, battery current and step discharge times of battery B. The third output terminal 33 of the controller 3 is electrically connected to the battery B and performs a battery health management method on the battery B according to the battery voltage, battery current and step discharge times of the battery B, and the battery health management method will be illustrated in FIG. 3 .

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 type of the controller 3 of the battery health management device A is not limited, and the controller 3 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 . In addition, the first detection circuit 1 , the second module 2 and the controller 3 can be integrated in the same chip or be three different chips.

Regarding other embodiments of the battery health management device A, the first detection circuit 1 is also provided with a first wireless communication module, the second module 2 is also provided with a second wireless communication module, and the controller 3 is also provided with a first wireless communication module. Three wireless communication modules. The first wireless communication module and the second wireless communication module are connected to the third wireless communication module respectively, whereby the controller 3 can obtain the battery voltage and battery current detected by the first detection circuit 1 and the second The number of step discharges detected by module 2.

FIG. 3 is a flow chart of the battery health management method according to the first embodiment of the present invention. As shown in FIG. 3 , in step S301 , the battery B is charged using a constant current/constant voltage charging method (CC/CV), so that the battery voltage of the battery B reaches a desired charging voltage. Regarding the constant current/constant voltage charging method, the battery B is continuously charged with a constant current until the battery voltage of the battery B reaches the expected charging voltage. Next, the battery B is charged according to the constant voltage, so that the battery voltage of the battery B is maintained at the expected charging voltage, until the battery current of the battery drops to the cut-off charging current.

In step S303, after the constant current/constant voltage charging method is completed, the drive battery B sequentially performs multiple step discharges, so that the battery voltage drops from the expected charging voltage to the storage voltage, and each step discharge includes battery B Discharge at a fixed expected discharge rate and discharge at a resting rate. Furthermore, the fixed expected discharge rate is greater than the resting discharge rate. In detail, the step discharge in step S303 includes a first sub-step and a second sub-step following the first sub-step. The first sub-step is to drive the battery B to discharge according to a predetermined current. The second sub-step is to discharge the battery B entering the static stage according to the static discharge rate. The above step S301 to step S303 is to execute a charging and discharging procedure for the battery B.

In step S305, it is judged whether the number of step discharges of the battery B is lower than a threshold value. When it is confirmed that the number of step discharges of the battery B is lower than the threshold value (for example, 14), step S307 is executed. In detail, the state of health (SOH) of the battery will gradually decrease with the increase of the charge and discharge times of the battery B, and the decrease of the battery SOH will also reduce the step discharge times of the battery B. Therefore, the number of step discharges of battery B can reflect the health status of battery B, and the lower the number of step discharges of battery B, the worse the health status of battery B is. When the number of step discharges of battery B is lower than the threshold value, it means that the available power supply time of battery B is greatly reduced at this time, and it is difficult to use normally.

In step S307, the expected charging voltage is increased according to a fixed voltage increase amount. For example, each time the expected charging voltage is increased, the increased voltage increment is 0.05V. When it is confirmed that the step discharge times of the battery B are not lower than the preset times threshold, step S309 is executed. In step S309, maintain the expected charging voltage, and then return to step S301.

In step S311, it is determined whether the expected charging voltage of the charging and discharging procedure is greater than or equal to the rated charging voltage. When it is confirmed that the expected charging voltage of the charging and discharging procedure is greater than or equal to the rated charging voltage, step S313 is executed. In step S313, set the rated charging voltage as the expected charging voltage, and then return to step S301. When it is confirmed that the expected charging voltage of the battery B is lower than the rated charging voltage, then return to step S301.

The battery health management method in FIG. 3 can be implemented by the battery health management device A in FIG. 2 , for example, but not limited thereto. In detail, step S301 , the first sub-step of step discharge in step S303 and steps S305 - S313 can be executed by the controller 3 of the battery health management device A. As shown in FIG.

In order to understand the battery health management method proposed in FIG. 3 more clearly, an example is given below. FIG. 4A is a graph showing the relationship between battery voltage and time based on the battery health management method in FIG. 3 , and FIG. 4B is a graph corresponding to the relationship between battery health status and time in FIG. 4A . Referring to Figure 4A and Figure 4B together, between the time point T0 and the time point T1, the battery is charged using the constant current/constant voltage charging method, wherein the charging current is 1A, the cut-off charging current is 0.1A, and the initial expected charging The voltage is 4.0V. Between the time point T1 and the time point T2, the battery B has performed 20 step discharges, and at the time point T2, the battery voltage has dropped from the expected charging voltage to the storage voltage, and the storage voltage is 3.9V.

Between time point T3 and time point T4, the number of step discharges performed by battery B is 14 times, which is already lower than the threshold value (15 times) of step discharge times. Therefore, when charging battery B next time, it must be increased Expected charging voltage. From the time point T0 to the time point T4, the state of health of the battery B continues to drop from 100% to 70%. At time point T4, the state of health of battery B is lower than the threshold (75%) of the state of health.

Between the time point T4 and the time point T5, the constant current/constant voltage charging method is also used to charge the battery B, the difference is that the expected charging voltage has been changed from 4.0V to 4.05V. Between time point T5 and time point T6, the number of step discharges performed by battery B was 16 times and could not be restored to 20 times, which means that the current health status of battery B has deteriorated due to multiple charge and discharge. In the initial state of health of battery B.

Between time point T7 and time point T8, the number of step discharges performed by battery B is 14 times, which is already lower than the threshold value (15 times) of step discharge times, so the next time battery B is charged, it must be charged again. Increase the expected charging voltage. From time point T4 to time point T8, the state of health of battery B continues to drop from 85% to 70%. At time point T8, the state of health of the battery B is lower than the threshold (75%) of the state of health.

Between the time point T8 and the time point T9, the constant current/constant voltage charging method is also used to charge the battery B, the difference is that the expected charging voltage has been changed from 4.05V to 4.10V. Between the time point T9 and the time point T10, the number of step discharges performed by battery B was 16 and could not be restored to 20 times, indicating that the current health status of battery B has deteriorated due to multiple charge and discharge. In the initial state of health of battery B. In addition, since the expected charging voltage has reached the rated charging voltage (4.1V), the battery B is subsequently charged according to the rated charging voltage.

[Second embodiment]

FIG. 5 is a flowchart of a battery health management method according to a second embodiment of the present invention. Compared with the battery health management method of the first embodiment in FIG. 3 , the battery health management method of the second embodiment in FIG. 5 is mainly different in that each time a step discharge is performed, the battery B is driven to discharge according to a non-fixed expected discharge. After the battery B is driven to discharge according to a non-fixed expected discharge rate, the battery B enters the static stage, and the detailed steps in Figure 5 are as follows.

In step S501 , the battery B is charged using a constant current/constant voltage charging method (CC/CV), so that the battery voltage of the battery B reaches a desired charging voltage. In step S503 , after the constant current/constant voltage charging method is completed, the driving battery B sequentially performs a plurality of step discharges, so that the battery voltage drops from the expected charging voltage to the storage voltage. Each step discharge includes discharging battery B according to a non-fixed expected discharge rate and discharging according to a resting discharge rate. Furthermore, the non-stationary expected discharge rate is greater than the resting discharge rate. In detail, the step discharge in step S503 includes a first sub-step and a second sub-step following the first sub-step, wherein the first sub-step is to drive the battery B to discharge with a non-fixed current, that is, the battery B 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 continuously with time. The second sub-step is to discharge the battery B entering the static stage according to the static discharge rate. The above step S501 to step S503 is to execute a charging and discharging procedure for the battery B.

In step S505, it is judged whether the number of step discharges of the battery B is lower than a threshold value. When it is confirmed that the number of step discharges of the battery B is lower than the threshold value, step S507 is executed. In step S507, the expected charging voltage is increased according to a fixed voltage increase amount. When it is confirmed that the step discharge times of the battery B are not lower than the preset times threshold, step S509 is executed. In step S509, maintain the expected charging voltage, and then return to step S501.

In step S511, it is determined whether the expected charging voltage of the charging and discharging procedure is greater than or equal to the rated charging voltage. When it is confirmed that the expected charging voltage of the charging and discharging procedure is greater than or equal to the rated charging voltage, step S513 is executed. In step S513, set the rated charging voltage as the expected charging voltage, and then return to step S501. When it is confirmed that the expected charging voltage of the battery B is lower than the rated charging voltage, then return to step S501.

The battery health management method in FIG. 5 can be implemented by the battery health management device A in FIG. 2 , for example, but is not limited thereto. In detail, step S501 , the first sub-step of step discharge in step S503 and steps S505 - S513 may be executed by the controller 3 of the battery health management device A, for example.

[Third embodiment]

FIG. 6 is a flowchart of a battery health management method according to a third embodiment of the present invention. Compared with the battery health management method of the first embodiment in FIG. 3, the battery health management method of the third embodiment in FIG. The voltage increase increases the expected charging voltage. For example, when the expected charging voltage is increased for the first time, the increased voltage increment is 0.01V, and when the expected charged voltage is increased for the second time, the increased voltage increment is changed from 0.01V to 0.02V, and the figure The detailed steps of 6 are as follows.

In step S601 , the battery B is charged using a constant current/constant voltage charging method (CC/CV), so that the battery voltage of the battery B reaches a desired charging voltage. In step S603 , after the constant current/constant voltage charging method is completed, the driving battery B sequentially performs a plurality of step discharges, so that the battery voltage drops from the expected charging voltage to the storage voltage. Each step discharge includes discharging battery B according to a fixed expected discharge rate and discharging according to a resting discharge rate. In detail, the step discharge includes a first sub-step and a second sub-step following the first sub-step, wherein the first sub-step is to drive the battery B to discharge according to a constant current, and the second sub-step enters a static state Stage battery B was discharged according to the resting discharge rate. The above step S601 to step S603 is to execute a charging and discharging procedure for the battery B.

In step S605, it is judged whether the number of step discharges of the battery B is lower than a threshold value. When it is confirmed that the number of step discharges of the battery B is lower than the threshold value, step S607 is executed. In step S507, increase the expected charging voltage according to the non-fixed voltage increase amount. When it is confirmed that the step discharge times of the battery B are not lower than the preset times threshold, step S609 is executed. In step S609, maintain the expected charging voltage, and then return to step S601.

In step S611, it is determined whether the expected charging voltage of the charging and discharging procedure is greater than or equal to the rated charging voltage. When it is confirmed that the expected charging voltage of the charging and discharging procedure is greater than or equal to the rated charging voltage, step S613 is executed. In step S613, set the rated charging voltage as the expected charging voltage, and then return to step S601. When it is confirmed that the expected charging voltage of the battery B is lower than the rated charging voltage, then return to step S601.

The battery health management method in FIG. 6 can be implemented by the battery health management device A in FIG. 2 , for example, but is not limited thereto. In detail, step S601 , the first sub-step of step discharge in step S603 and steps S605 - S613 may be executed by the controller 3 of the battery health management device A, for example.

[Fourth embodiment]

FIG. 7 is a flowchart of a battery health management method according to a fourth embodiment of the present invention. Compared with the battery health management method of the first embodiment in FIG. 3 , the battery health management method of the fourth embodiment in FIG. 7 is mainly different in that each time a step discharge is performed, the battery B is driven to discharge according to a non-fixed expected discharge. After the battery B is driven to discharge according to a non-fixed expected discharge rate, the battery B enters the static stage. When it is confirmed that the number of step discharges of the battery B is lower than the threshold value, the expected charging voltage is increased according to the non-fixed voltage increase, and the detailed steps in FIG. 7 are as follows.

In step S701 , the battery B is charged using a constant current/constant voltage charging method (CC/CV), so that the battery voltage of the battery B reaches a desired charging voltage. In step S703 , after the constant current/constant voltage charging method is completed, the driving battery B sequentially performs a plurality of step discharges, so that the battery voltage drops from the expected charging voltage to the storage voltage. Each step discharge includes discharging battery B according to a non-fixed expected discharge rate and discharging according to a resting discharge rate. Furthermore, the non-stationary expected discharge rate is greater than the resting discharge rate. In detail, the step discharge includes a first sub-step and a second sub-step following the first sub-step, wherein the first sub-step is to drive the battery B to discharge according to a non-fixed current, and the second sub-step is to enter The battery B in the static stage is discharged according to the static discharge rate. The above step S701 to step S703 is to execute a charging and discharging procedure for the battery B.

In step S705, it is judged whether the number of step discharges of the battery B is lower than a threshold value. When it is confirmed that the number of step discharges of the battery B is lower than the threshold value, step S707 is executed. In step S707, increase the expected charging voltage according to the non-fixed voltage increase amount. When it is confirmed that the step discharge times of the battery B are not lower than the preset times threshold, step S709 is executed. In step S709, maintain the expected charging voltage, and then return to step S701.

In step S711, it is determined whether the expected charging voltage of the charging and discharging procedure is greater than or equal to the rated charging voltage. When it is confirmed that the expected charging voltage of the charging and discharging procedure is greater than or equal to the rated charging voltage, step S713 is executed. In step S713, set the rated charging voltage as the expected charging voltage, and then return to step S701. When it is confirmed that the expected charging voltage of the battery B is lower than the rated charging voltage, then return to step S701.

The battery health management method in FIG. 7 can be implemented by the battery health management device A in FIG. 2 , for example, but is not limited thereto. In detail, step S701 , the first sub-step of step discharge in step S703 and steps S705 - S713 can be executed by the controller 3 of the battery health management device A, for example.

[Advantageous Effects of Embodiment]

One of the beneficial effects of the present invention is that, through the battery health management method and battery health management device provided by the present invention, whenever the number of step discharges of the battery is lower than the threshold value, it means that the current state of health of the battery is not good, so through Increase the voltage level of the expected charging voltage, so that the number of step discharges of the battery exceeds the threshold. In this way, the time during which the number of step discharges is higher than the threshold value can be greatly increased, thereby improving the health status of the battery. In addition, when the battery is discharged according to the expected discharge rate greater than the static discharge rate, the time required for the battery voltage to drop from the expected charging 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, and the purpose of delaying battery aging can also be achieved.

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: The first detection circuit 2: The second module 3: Controller 11: The first input terminal 12: The first output terminal 21: The second input terminal 22: The second output terminal 31: The third input terminal 32: The fourth input terminal 33: The third output terminal B: battery S301: Use the constant current/constant voltage charging method to charge the battery, so that the battery voltage of the battery reaches the expected charging voltage S303: Drive the battery to perform multiple step discharges in sequence, so that the battery voltage drops from the expected charging voltage to the storage voltage, and each step discharge includes discharging the battery according to a fixed expected discharge rate and discharging according to a static discharge rate S305: Judging whether the step discharge times of the battery is lower than the threshold value S307: Increase the expected charging voltage according to the fixed voltage increase S309: Maintain expected charging voltage S311: judging whether the expected charging voltage of the charging and discharging program is greater than or equal to the rated charging voltage S313: Set the rated charging voltage as the expected charging voltage S501: Use the constant current/constant voltage charging method to charge the battery, so that the battery voltage of the battery reaches the expected charging voltage S503: Drive the battery to perform multiple step discharges in sequence, so that the battery voltage drops from the expected charging voltage to the storage voltage, and each step discharge includes discharging the battery according to a non-fixed expected discharge rate and discharging according to a resting discharge rate S505: Judging whether the step discharge times of the battery is lower than the threshold value S507: Increase the expected charging voltage according to the fixed voltage increase S509: Maintain expected charging voltage S511: judging whether the expected charging voltage of the charging and discharging program is greater than or equal to the rated charging voltage S513: Set the rated charging voltage as the expected charging voltage S601: Use the constant current/constant voltage charging method to charge the battery, so that the battery voltage of the battery reaches the expected charging voltage S603: Drive the battery to perform multiple step discharges in sequence, so that the battery voltage drops from the expected charging voltage to the storage voltage, and each step discharge includes discharging the battery according to a fixed expected discharge rate and discharging according to a static discharge rate S605: Judging whether the step discharge times of the battery is lower than the threshold value S607: Increase the expected charging voltage according to the non-fixed voltage increase S609: Maintain expected charging voltage S611: judging whether the expected charging voltage of the charging and discharging program is greater than or equal to the rated charging voltage S613: Set the rated charging voltage as the expected charging voltage S701: Use the constant current/constant voltage charging method to charge the battery so that the battery voltage of the battery reaches the expected charging voltage S703: Drive the battery to perform multiple step discharges in sequence, so that the battery voltage drops from the expected charging voltage to the storage voltage, and each step discharge includes discharging the battery according to a non-fixed expected discharge rate and discharging according to a resting discharge rate S705: Judging whether the step discharge times of the battery is lower than the threshold value S707: Increase the expected charging voltage according to the non-fixed voltage increase S709: Maintain expected charging voltage S711: judging whether the expected charging voltage of the charging and discharging program is greater than or equal to the rated charging voltage S713: Set the rated charging voltage to the expected charging 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 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. 4A is a graph showing the relationship between battery voltage and time based on the battery health management method in FIG. 3 .

FIG. 4B is a graph corresponding to the relationship between battery state of health and time in FIG. 4A .

FIG. 5 is a flowchart of a battery health management method according to a second embodiment of the present invention.

FIG. 6 is a flowchart of a battery health management method according to a third embodiment of the present invention.

FIG. 7 is a flowchart of a battery health management method according to a fourth embodiment of the present invention.

S301: Use the constant current/constant voltage charging method to charge the battery, so that the battery voltage of the battery reaches the expected charging voltage

S303: Drive the battery to perform multiple step discharges in sequence, so that the battery voltage drops from the expected charging voltage to the storage voltage, and each step discharge includes discharging the battery according to a fixed expected discharge rate and a static discharge rate

S305: Judging whether the step discharge times of the battery is lower than the threshold value

S307: Increase the expected charging voltage according to the fixed voltage increase

S309: Maintain expected charging voltage

S311: judging whether the expected charging voltage of the charging and discharging program is greater than or equal to the rated charging voltage

S313: Set the rated charging voltage as the expected charging voltage

Claims (9)

A battery health management method, comprising: executing a charging and discharging program for a battery, the charging and discharging program includes multiple step discharges, and each step discharge includes: driving the battery to discharge according to a fixed discharge rate; judging the battery Whether the number of step-by-step discharges is lower than a threshold value; when the step-by-step discharge times are lower than the threshold value, increase an expected charging voltage of the charge-discharge procedure; when the step-by-step discharge times are not lower than the threshold value, maintain the Expected charging voltage; judging whether the expected charging voltage is greater than or equal to a rated charging voltage; when the expected charging voltage is greater than or equal to the rated charging voltage, perform the charging and discharging procedure on the battery according to the rated charging voltage; and when the expected The charging voltage is lower than the rated charging voltage, and the charging and discharging procedure is performed on the battery according to the expected charging voltage. The battery health management method as described in claim 1, wherein the charging and discharging procedure includes: charging the battery through a constant current/constant voltage charging method, so that a battery voltage of the battery reaches the expected charging voltage; and executing the Multiple step discharges are performed to lower the battery voltage from the expected charging voltage to a storage voltage. The battery health management method as described in Claim 2, wherein each step of discharging further includes: leaving the battery to discharge itself according to a static discharge rate, wherein the fixed discharge rate is greater than the static discharge rate. The battery health management method according to claim 1, wherein increasing the expected charging voltage includes increasing the expected charging voltage according to a fixed voltage increase. The battery health management method as described in claim 1, wherein the expected charge is increased Voltage includes increasing the expected charging voltage according to a non-fixed voltage increase. A battery health management device, comprising: a first detection circuit for detecting a battery voltage and a battery current of a battery; a second module for detecting the step-by-step discharge times of the battery; and a A controller electrically connected to the first detection circuit, the second module, and the battery; wherein the controller is used to execute a health management method, and the health management method includes: executing a charging and discharging procedure on a battery, the The charge and discharge program includes multiple step discharges, and each step discharge includes: driving the battery to discharge according to a fixed discharge rate; judging whether the step discharge times of the battery are lower than a threshold value; when the step discharge times If it is lower than the threshold value, increase an expected charging voltage of the charging and discharging procedure; when the number of step discharges is not lower than the threshold value, maintain the expected charging voltage; determine whether the expected charging voltage is greater than or equal to a rated charging voltage; When the expected charging voltage is greater than or equal to the rated charging voltage, perform the charging and discharging procedure on the battery according to the rated charging voltage; The charge and discharge procedure. The battery health management device according to claim 6, wherein the first detection circuit includes a first input terminal and a first output terminal, the second module includes a second input terminal and a second output terminal, The controller includes a third input terminal, a first Four input terminals and a third output terminal, the first input terminal and the second input terminal are respectively electrically connected to the battery, the first output terminal and the second output terminal are respectively electrically connected to the third input terminal and the fourth input end, the third output end is electrically connected to the battery. The battery health management device as claimed in claim 6, wherein the controller increases the expected charging voltage according to a fixed voltage increase amount. The battery health management device as claimed in claim 6, wherein the controller increases the expected charging voltage according to a non-fixed voltage increase amount.

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