TW201814318A - A method for estimating a battery power percentage of a battery and a power management apparatus - Google Patents

Abstract

This disclosure relates to a method for estimating a battery power percentage of a battery, wherein the method includes: performing a first fuel gauge operation upon the battery; and using the first fuel gauge operation to generate the battery power percentage of the battery by referring to information measured by a second fuel gauge operation performed upon the battery wherein the second fuel gauge operation is different from the first fuel gauge operation. Therefore, this disclosure can achieve high accuracy for all battery status estimates and high applicability, and only need to wait for less time to get the correct battery power percentage.

Description

Method for obtaining battery power percentage and power management device

The present invention relates to the technical field of batteries, and in particular, to a method and a power management device for obtaining a percentage of battery power.

Generally speaking, there are currently multiple types of conventional fuel gauge solutions provided to estimate the battery's charge percentage, especially when the battery is reconnected to the fuel gauge device or connected to the fuel gauge device for the first time. Unfortunately, because batteries can be replaced, charged, discharged, processed, or at rest, traditional solutions have their own performance limitations; that is, the state of the battery may vary at different times. For example, some traditional schemes can achieve high estimation accuracy, but only when the battery is at rest for a long time. Although other traditional solutions can be applied to all battery states, it is difficult to achieve high estimation accuracy. Therefore, it is difficult to achieve a high estimation accuracy and high applicability for all battery states using only a single traditional fuel gauge scheme.

In view of this, the present invention provides a method and a power management device for obtaining a battery power percentage, so as to realize high-precision estimation and high applicability of all battery states.

According to a first aspect of the present invention, a method for obtaining a battery power percentage is disclosed, comprising: performing a first power measurement operation on the battery to measure the battery power percentage; and performing a second power measurement operation on the battery by reference. The obtained information uses the first power measurement operation to obtain a battery power percentage; wherein the second power measurement operation is different from the first power measurement operation.

According to a second aspect of the present invention, a power management device for obtaining a percentage of battery power is disclosed, comprising: a memory device; a controller coupled to the memory device and configured to load code from the memory device, To perform the following steps; perform a first power measurement operation on the battery to measure the battery power percentage; and use the first power measurement operation to obtain the battery power percentage by referring to information obtained from the second power measurement operation performed on the battery; The second electric quantity measurement operation is different from the first electric quantity measurement operation.

After the method provided by the present invention performs the first power measurement operation on the battery to obtain the battery power percentage, the first power measurement operation can be quickly compensated or calibrated by using the information measured by the second power measurement operation, thereby using the first power The calculation operation quickly and accurately obtains the percentage of battery power, which can achieve high-precision estimation and high applicability of all battery states. At the same time, the invention only needs to wait for less time to obtain the correct percentage of battery power.

The following description is a preferred embodiment of the present invention. The following embodiments are only used to illustrate the technical features of the present invention, and are not intended to limit the scope of the present invention. Certain terms are used throughout the specification and scope of patent applications to refer to specific elements. Those skilled in the art will understand that manufacturers may use different terms to refer to the same components. The scope of this specification and the patent application does not take the difference in names as a way to distinguish components, but rather uses the difference in functions of components as a basis for differences. The scope of the invention should be determined with reference to the appended patent application scope. The terms “component”, “system” and “device” used in the present invention may be a computer-related entity, wherein the computer may be hardware, software, or a combination of hardware and software. The terms "including" and "including" mentioned in the following description and the scope of patent application are open-ended terms, and therefore should be interpreted as "including, but not limited to ...". Furthermore, the term "coupled" means an indirect or direct electrical connection. Therefore, if one device is described as being coupled to another device, it means that the device can be directly electrically connected to the other device, or indirectly electrically connected to the other device through the other device or connection means.

Please refer to FIG. 1. FIG. 1 is a flowchart showing a method capable of accurately measuring / measuring the battery power (especially the remaining power) of the first embodiment of the present invention. This method can significantly improve the accuracy of the battery percentage measurement of the battery. It should be noted that the battery power percentage in the embodiment of the present application is represented by a depth-of-discharge (DOD). This is not a limitation on the present invention, because the battery power percentage can also be expressed by state-of-charge (SOC), and the state of charge supplements the depth of discharge. The method is configured to use and execute two different fuel gauge operations to produce two different information results, each of which includes at least one of a percentage represented by DOD and a battery cell voltage corresponding to the percentage Among them, the two different information results are regarded as the measurement results, and one of the two kinds of measurement results of the electric quantity calculation operation is dynamically selected as the measurement result according to different conditions of the battery. In practice, the method is set to dynamically arrange / set different levels of trust for two types of electricity metering calculations under different conditions. In some cases, the trust level of one power measurement operation is configured to be higher than the trust level of another power measurement operation, but in other cases it is configured to be lower than the trust level of another power measurement operation. Therefore, by dynamically rating / adjusting the trust level under different conditions, this method can configure / set the measurement result as a percentage of the electricity metering calculation with a higher trust level. In addition, the method may be set to select a measurement result of a corresponding operation from at least three kinds of power measurement operations based on their level of trust. The number of electric quantity calculation operations is not a limitation on the present invention.

In an embodiment, the two different types of power measurement operations include a first power measurement operation (for example, a voltage-based power measurement operation) and a second power measurement operation (for example, a coulomb-based power measurement operation). The voltage-based measurement operation uses a sensing resistor and measures the voltage drop across the sensing resistor to estimate the battery current, thereby measuring the remaining power of the battery and obtaining first information, the first information including the corresponding one hundredth represented by DOD At least one of a fractional ratio and a first battery cell voltage corresponding to a first percentage. The coulometric calculation based on the coulomb counter uses a coulomb counter circuit to measure the battery current, thereby measuring the remaining power of the battery and obtaining second information, the second information includes a corresponding second percentage represented by DOD and a corresponding second At least one of the scaled second battery cell voltages. This method can improve the traditional scheme, and based on the advantages of both the voltage-based fuel gauge calculation and the coulomb-based fuel gauge calculation, it can provide users with different conditions such as temperature, aging factor, battery history, etc. Provide more accurate power metering results.

It should be noted that determining which percentage is used as the percentage of battery power is based on the determination of the first information and the second information. In practice, the determination operation may be performed based on the first percentage and the second percentage; in addition, the determination operation may be performed based on the first battery cell voltage and the second battery cell voltage. An advantage of performing the determination operation based on the first battery cell voltage and the second battery cell voltage is that, in some cases, the variation range of the corresponding battery cell voltage is wider than the variation range of the above percentage. In addition, by converting the above percentages to generate corresponding battery cell voltages based on the look-up data sheet, the corresponding battery cell voltages can be easily obtained.

As long as the substantially the same result can be achieved, the order of the steps of the flowchart shown in FIG. 1 need not be strictly in the order shown and need not be continuous, that is, there may be other steps in the middle. The detailed steps of FIG. 1 are as follows.

Step 105: Start;

Step 110: Determine whether to re-estimate or recalculate the battery charge percentage? If yes, go to step 120; otherwise, continue to step 115;

Step 115: Estimate the battery current by using the sensing resistor and measuring the voltage drop across the sensing resistor, and perform a voltage-based fuel gauge operation to measure the remaining battery percentage and generate a first percentage;

Step 120: by using a coulomb counter circuit to measure the current of the battery, performing a coulomb meter-based power measurement operation, thereby measuring the remaining battery percentage and generating a second percentage;

Step 125: Compare and calculate the percentage difference between the first percentage and the second percentage;

Step 130: Determine if the percentage difference is above the percentage threshold? If the percentage difference is higher than the percentage threshold, the trust level of the voltage-based electricity metering operation is configured to be higher than the trust level of the coulomb-based electricity metering operation, and the process further performs step 120; otherwise, the voltage-based electricity metering operation The trust level is configured to be lower than the trust level of the coulomb-based electricity measurement operation, and the flow proceeds to step 115.

In step 110, an operation of determining whether to re-estimate or recalculate the percentage of the battery ’s charge can be determined by determining whether the battery has remained in a stationary state for a specific period of time. The stationary state means that the battery is not provided to the system when the battery is in a static condition. The current may provide very little current. If the battery has been held for a certain period of time under this static condition, the method is set to determine that the battery has rested for that particular period of time, and the method can re-estimate or recalculate the battery's charge percentage to calculate the current charge percentage. Then, proceed to step 120. In step 120, the coulomb counter circuit is used to measure / accumulate the current of the battery during a time interval to measure the battery's charge percentage.

It should be noted that the method is set to estimate or calculate the initial charge percentage of the battery at step 105, so when the battery-powered system restarts, the method proceeds to step 115. In step 115, the battery current is estimated by using an AC (alternating current) resistor and measuring the voltage drop across the AC resistance, and a voltage-based fuel gauge calculation is performed to measure the current battery charge percentage represented by DOD or SOC. The change in voltage drop can reflect the change in battery current, so this method can measure the current battery's DOD percentage based on the change in voltage drop.

At step 125 and step 130, the method is configured to dynamically and selectively select one of two measurement results of a coulomb-based coulometry calculation and a voltage-based coulometry calculation. The method is set to compare and calculate the percentage difference between two percentages, and then decide whether the percentage difference is above the percentage threshold. If the percentage difference is higher than the percentage threshold, the method determines that the reliability of the coulomb-based fuel-gauge operation is lower than the reliability of the voltage-based fuel-gauge operation, and accordingly, the trust level of the coulomb-based electricity meter operation is set to Lower value. Conversely, if the percentage difference is lower than the percentage threshold, the method determines that the reliability of the coulomb-based fuel-gauge operation is higher than the reliability of the voltage-based fuel-gauge operation, and accordingly, the trust level of the coulomb-based electricity meter operation is Set to a higher value. By doing so, the method can effectively evaluate the reliability of the coulomb-meter-based fuel-gauge operation and the voltage-based fuel-gauge operation, and thus determine one of the two measurement results as the battery power percentage result. Due to the different advantages, accuracy, and measurement conditions of the two different types of energy measurement calculations, by selectively using one measurement result as the final result, this method can obtain the advantages of these two different types of energy measurement operations and avoid their limitations. Sex. For example, if the battery has been kept in a static condition, the method can use the percentage of the coulomb-based fuel gauge calculation as the final battery charge percentage. If the battery is not kept in a static condition, the method can use the percentage of the voltage-based fuel gauge calculation as the final battery charge percentage. That is, the method is set to be able to use the two different kinds of electric quantity calculation operations and dynamically select one measurement result of the two different kinds of electric quantity calculation operations as the final result. Therefore, the method can improve the accuracy of the final measurement result and display the final measurement result of the percentage of battery power for the user.

In another embodiment, for step 125, the method may be set to compare and calculate a voltage difference between the first battery cell voltage and the second battery cell voltage. For step 130, the method may be set to determine whether the voltage difference is above a voltage threshold. If the voltage difference is higher than the voltage threshold, the trust level of the voltage-based coulometry calculation is configured to be higher than the trust level of the coulomb-based coulometry calculation. Otherwise, the trust level of the voltage-based electricity measurement operation is configured to be lower than the trust level of the coulomb-based electricity measurement operation.

In addition, if the trust level of the voltage-based fuel gauge calculation is higher than the trust level of the coulomb-based fuel gauge calculation and exceeds the high threshold (or if the percentage difference between the two percentages is higher than the high percentage threshold), this means The measurement results of the voltage-based coulometric calculation become more reliable. In this case, the coulomb-based coulometric calculation should be re-executed to measure the battery's charge percentage, and the coulomb-based coulometric calculation percentage result should be generated again. And re-evaluate the level of trust in coulomb-based power measurement calculations. This is equivalent to improving the accuracy of the coulomb-based coulometry calculation by referring to the measurement results of the voltage-based coulometry calculation. Similarly, if the trust level of the coulometric calculation based on the coulomb counter is higher than the trust level of the voltage-based fuel measurement calculation and exceeds the high threshold (or if the percentage difference between the two percentages is higher than the high percentage threshold), this means The measurement results of the coulometric calculation based on the coulomb meter have become more reliable. In this case, the voltage-based fuel measurement calculation should be performed again to measure the battery's charge percentage, and the voltage-based fuel measurement calculation percentage result should be generated again. And re-evaluate the level of trust in voltage-based energy measurement calculations. This is equivalent to improving the accuracy of the voltage-based energy measurement operation by referring to the measurement results of the coulomb-based energy measurement operation.

The above method or at least one step may be performed by a controller or a microcontroller executing loading corresponding code from a memory device (such as a register circuit). FIG. 2 is a block diagram of the power management device 200 capable of accurately measuring and measuring the remaining power of the battery 201 according to the flowchart in FIG. 1. The power management device 200 is coupled to the battery 201 and includes a memory device 205 and a controller 210, which can be implemented by a single integrated circuit chip. The memory device 205 is configured to store or buffer the measurement result (ie, the power percentage) and the corresponding code of the power measurement operation. The controller 210 is coupled to the memory device 205 and is configured to load code from the memory device 205 when a software application or system is enabled to enable and execute two fuel gauge operations to estimate a battery power percentage. The controller 210 is then configured to execute code to perform the operations of the above steps. Further description is not repeated here.

In addition, in the second embodiment of the present invention, a method capable of more accurately estimating / calculating the percentage of the charge of the battery is provided. In particular, when the battery-powered system is restarted or the battery has been resting for a period of time (fully rested state or static state), the charge percentage may be, for example, but not limited to, the discharge depth percentage of the battery. In some embodiments, the power percentage may be expressed as a state-of-charge (SOC) percentage. More specifically, the method may be set to estimate or measure the initial charge percentage of the battery, and may improve the accuracy of the estimation of the initial charge percentage, especially when the battery is first connected to or reconnected to the coulometer circuit. The method is set to accurately select a battery percentage from the previous battery percentage, software estimated percentage, and hardware measurement percentage as the initial battery percentage based on the confidence level calculated or determined from the following information, the information including at least the At least one of a percentage difference between a pair of percentages and a voltage difference between at least a pair of battery cell voltages corresponding to the percentage. In other words, based on the percentage difference and / or the corresponding battery cell voltage difference, a charge percentage can be selected as the initial charge percentage. In addition, the method may selectively display the previous battery percentage for the user to improve the user experience in some cases, even if the initial battery percentage is determined to be a software estimated percentage or a hardware measured percentage. FIG. 3 is a flowchart illustrating a method capable of accurately metering / measuring the electric quantity of a battery according to a second embodiment of the present invention. As long as the basically the same result can be achieved, the order of the steps of the flowchart shown in FIG. 3 need not strictly follow the order shown and need not be continuous, that is, there may be other steps in the middle. The detailed steps in Figure 3 are as follows:

Step 305: Start;

Step 310: Read the previous power percentage RTCP (or the most recent power percentage) from a memory device (such as a register circuit) located inside or outside the battery pack containing the battery;

Step 315: generate a hardware measurement percentage HWP of the battery by using a hardware circuit (such as a Coulomb counter circuit), where the hardware measurement percentage HWP may be, for example, a hardware open circuit voltage measurement percentage;

Step 320: generate a software estimated percentage SWP of the battery by using a software algorithm capable of estimating battery power, where the software estimated percentage SWP may be, for example, software open circuit voltage estimated percentage;

Step 325: Calculate or determine the trust level of the previous power percentage RTCP, the hardware measurement percentage HWP, and the software estimated percentage SWP based on the difference between at least one pair of the previous power percentage RTCP, the hardware measurement percentage HWP, and the software estimated percentage SWP. ;

Step 330: dynamically select a percentage from the previous power percentage RTCP, the hardware measurement percentage HWP, and the software estimated percentage SWP as the initial power percentage by referring to the above-mentioned trust level;

Step 335: End.

For example, if the difference (or absolute difference) between the hardware measurement percentage HWP and the previous power percentage RTCP is much higher than the threshold (e.g. 30% DOD), the method is set to determine that the previous power percentage RTCP is less reliable than the hardware Measure the percentage HWP. In addition, if the difference (or absolute difference) between the software estimated percentage SWP and the previous power percentage RTCP is much higher than the threshold (for example, 10% DOD), the method is set to determine that the software estimated percentage SWP has a higher trust level than the previous power percentage RTCP's level of trust. In addition, if the difference (or absolute difference) between the hardware measurement percentage HWP and the software estimated percentage SWP is much higher than the threshold (for example, 30%), the method is set to determine that the software estimated percentage SWP has a higher level of trust than the hardware measurement Percent HWP level of trust. In addition, if the battery is not connected to the charger device, has not been swapped / preset, and / or the previous power percentage RTCP has not been accessed / processed, this method can increase the trust level of the previous power percentage RTCP. In addition, if the software estimated percentage SWP is below a lower threshold (for example, 3% DOD), this method can increase the confidence level of the software estimated percentage SWP. Therefore, by referring to at least one step of rating, configuring or adjusting the trust level of the previous power percentage RTCP, hardware measurement percentage HWP, and software estimated percentage SWP, the method can accordingly and accurately choose one of the three percentages As a percentage of the battery's initial charge. Several modified embodiments are provided in detail below.

In addition, in another embodiment of step 325, the method may be configured to calculate or determine a previous charge percentage RTCP, hardware based on a voltage difference between at least one of the battery cell voltages corresponding to the three percentages. The level of confidence in measuring percentage HWP and software estimated percentage SWP.

4A and 4B are flowcharts showing a first embodiment of the method shown in FIG. 3. As long as the substantially the same result can be achieved, the order of the steps of the flowchart shown in FIG. 4A and FIG. 4B need not strictly follow the order shown and need not be continuous, that is, there may be other steps in the middle. The detailed steps for Figures 4A and 4B are as follows:

Step 405: Start;

Step 410: If the charger is connected to the battery, stop / disable the charger;

Step 415: Perform a hardware measurement operation to obtain a hardware measurement percentage HWP, perform a software measurement operation to obtain a software estimated percentage SWP, and read a previous power percentage RTCP from the memory device;

Step 420: Determine whether the battery is replaced. If the battery has not been replaced, continue to step 425; otherwise, continue to step 455;

Step 425: Determine if the battery is now connected to the charger device. If the battery is not connected to the charger device, proceed to step 430; otherwise, proceed to step 455;

Step 430: Determine whether to use the previous power percentage RTCP as the initial power percentage. If it is determined that the previous power percentage RTCP is not used to set the initial power percentage, proceed to step 435; otherwise, proceed to step 440;

Step 435: Set the trust level of hardware measurement percentage HWP or software estimated percentage SWP trust level to the highest level, and configure the initial power percentage as hardware measurement percentage HWP or software estimated percentage SWP;

Step 440: Determine whether the software estimated percentage SWP is below a low threshold. If the software estimated percentage SWP is lower than the low threshold (for example, 3% DOD), proceed to step 445; otherwise, proceed to step 450;

Step 445: Set the trust level of the software estimated percentage SWP to the highest level, and configure the initial power percentage as the software estimated percentage SWP to display the previous power percentage RTCP to the user to indicate to the user an initial power percentage equal to the previous power percentage RTCP, and The software does not display the estimated percentage SWP, so the user experience of the battery level is smooth;

Step 450: Set the trust level of the previous power percentage RTCP to the highest level, and configure the initial power percentage as the previous power percentage RTCP to display the previous power percentage RTCP to the user;

Step 455: Calculate the absolute difference between the hardware measurement percentage HWP and the previous power percentage RTCP, and determine whether the absolute difference is higher than a specific threshold; if the absolute difference is higher than a specific threshold (for example, 30% DOD), Continue to step 460; otherwise, perform step 465;

Step 460: Calculate the first absolute difference between the hardware measurement percentage HWP and the software estimated percentage SWP and the second absolute difference between the software estimated percentage SWP and the previous power percentage RTCP, and determine whether the first absolute difference is less than The second absolute difference; if yes, proceed to step 470; otherwise, proceed to step 465;

Step 465: Calculate the absolute difference between the software estimated percentage SWP and the previous power percentage RTCP, and determine whether the absolute difference is greater than a threshold (such as 10 ± 1%); if it is greater than the threshold, start to execute step 475; otherwise, execute Step 430;

Step 470: Calculate the absolute difference between the hardware measurement percentage HWP and the software estimated percentage SWP, and determine whether the absolute difference is greater than a threshold value (such as 15%); if it is greater than the threshold value, start to execute step 480; otherwise, execute step 485;

Step 475: Calculate a third absolute difference between the software estimated percentage SWP and the previous charge percentage RTCP and a fourth absolute difference between the software estimated percentage SWP and the rated battery percentage VBATP, and determine whether the third absolute difference is higher than The fourth absolute difference; if yes, start to perform step 480; otherwise, perform step 430;

Step 480: Set the trust level of the software estimated percentage SWP to the highest level, configure the initial power percentage as the software estimated percentage SWP, and display the software estimated percentage SWP to the user;

Step 485: Set the trust level of the hardware measurement percentage HWP to the highest level, configure the initial power percentage as the hardware measurement percentage HWP, and display the hardware measurement percentage HWP for the user;

Step 490: End.

FIG. 5 is a flowchart showing a second embodiment of the method shown in FIG. 3. As long as the substantially the same result can be achieved, the order of the steps of the flowchart shown in FIG. 5 need not be strictly in the order shown and need not be continuous, that is, there may be other steps in the middle. The detailed steps of Figure 5 are as follows:

Step 505: Start;

Step 510: if the charger is connected to the battery, stop / disable the charger;

Step 515: Perform a hardware measurement operation to obtain a hardware measurement percentage HWP, perform a software measurement operation to obtain a software estimated percentage SWP, and read a previous power percentage RTCP from the memory device;

Step 520: Determine whether the battery is embedded in the battery pack. If it is embedded in the battery pack, proceed to step 525; otherwise, proceed to step 530;

Step 525: Configure the initial power percentage as the embedded power percentage.

Step 530: Determine whether the battery is replaced. If the battery has not been replaced, continue to step 535; otherwise, continue to step 540;

Step 535: Determine if the battery is now connected to the charger device. If the battery is not connected to the charger device, proceed to step 525; otherwise, proceed to step 545;

Step 540: Configure the battery loop to zero and the loop of the coulomb counter circuit to zero.

Step 545: Calculate the absolute difference between the hardware measurement percentage HWP and the previous power percentage RTCP, and determine whether the absolute difference is higher than a specific threshold; if the absolute difference is higher than the specific threshold (for example, 30% DOD) , Proceed to step 550; otherwise, proceed to step 555;

Step 550: Calculate the first absolute difference between the hardware measurement percentage HWP and the software estimated percentage SWP and the second absolute difference between the software estimated percentage SWP and the previous power percentage RTCP, and determine whether the first absolute difference is less than The second absolute difference; if yes, proceed to step 560; otherwise, proceed to step 555;

Step 555: Calculate the absolute difference between the rated power percentage VBATP and the previous power percentage RTCP, and determine whether the absolute difference is greater than a threshold (such as 10%); if it is greater than the threshold, proceed to step 560; otherwise, proceed to step 525 ;

Step 560: Calculate the absolute difference between the hardware measurement percentage HWP and the software estimated percentage SWP, and determine whether the absolute difference is greater than a threshold value (such as 15%); if it is greater than the threshold value, start to execute step 565; otherwise, execute step 570;

Step 565: Set the trust level of the software estimated percentage SWP to the highest level, and configure the initial power percentage as the software estimated percentage SWP to display the software estimated percentage SWP to the user;

Step 570: Set the trust level of the hardware measurement percentage HWP to the highest level, configure the initial power percentage as the hardware measurement percentage HWP, and display the hardware measurement percentage HWP for the user;

Step 575: End.

6A and 6B are flowcharts showing a third embodiment of the method shown in FIG. 3. As long as the substantially the same result can be achieved, the order of the steps of the flowcharts shown in FIG. 6A and FIG. 6B need not strictly follow the order shown and need not be continuous, that is, there may be other steps in the middle. The detailed steps for Figures 6A and 6B are as follows:

Step 605: Start;

Step 610: Determine whether to use the previous power percentage RTCP as the initial power percentage. If it is determined that the previous power percentage RTCP is not used as the initial power percentage, step 615 is performed; otherwise, step 630 is performed;

Step 615: Calculate the absolute difference between the hardware measurement percentage HWP and the software estimated percentage SWP, and determine whether the absolute difference is greater than a threshold (such as 15%); if it is greater than the threshold, start to execute step 620; otherwise, execute step 625;

Step 620: Set the trust level of the software estimated percentage SWP to the highest level, and configure the initial power percentage as the software estimated percentage SWP to display the software estimated percentage SWP to the user, so as to indicate the battery power when the system is restarted;

Step 625: Set the trust level of the hardware measurement percentage HWP to the highest level, configure the initial power percentage as the hardware measurement percentage HWP, and display the hardware measurement percentage HWP for the user to indicate the battery power when the system restarts;

Step 630: Determine whether the previous power percentage RTCP is higher than the software estimated percentage SWP. If the previous power percentage RTCP is higher than the software estimated percentage SWP, step 650 is started; otherwise, step 635 is performed;

Step 635: Determine if the battery is now connected to or inserted into the charger device. If the battery is connected to the charger device, go to step 645; otherwise, go to step 640;

Step 640: Calculate the absolute difference between the software estimated percentage SWP and the previous power percentage RTCP, and determine whether the absolute difference is greater than a threshold (such as 15% ± 1%); if it is greater than 16% (or 14% in some cases) ), Start to perform step 650; otherwise, perform step 645;

Step 645: Set the trust level of the previous power percentage RTCP to the highest level, and configure the initial power percentage as the previous power percentage RTCP to display the previous power percentage RTCP to the user, so as to indicate the battery power when the system is restarted;

Step 650: Determine whether the absolute difference between the software estimated percentage SWP and the previous power percentage RTCP is greater than a lower threshold (e.g., 10% ± 1%); if it is greater than 11% (or 9% in some cases), start to perform steps 655; otherwise, go to step 660;

Step 655: Set the trust level of the software estimated percentage SWP to the highest level, and configure the initial power percentage as the software estimated percentage SWP to show the user the previous power percentage RTCP (or the previous power percentage RTCP minus 1%) so that when the system restarts Indicate the battery level when starting up;

Step 660: Determine whether the software estimated percentage SWP is lower than a low threshold (for example, 3%); if the software estimated percentage SWP is lower than 3%, start to execute step 655; otherwise, execute step 645;

Step 665: End.

Similarly, for the steps of FIG. 4 to FIG. 6, in other embodiments, the method may be set according to the voltage difference between at least one of the battery cell voltages corresponding to the three percentages of RTCP, HWP, and SWP. , Calculate or determine the trust level of the previous power percentage RTCP, hardware measurement percentage HWP, and software estimated percentage SWP. Corresponding operations (calculation and comparison with threshold) related to the battery cell voltage are similar to these three percentage-related operations, and further detailed description will not be repeated here.

In addition, in some embodiments, the method may be set to adjust the trust level of the above three percentages based on battery usage / history information, time information, aging factor, and / or temperature information. For example, this method can increase the confidence level of the hardware measurement percentage HWP to the highest level if the time information indicates that the battery has been resting for a certain period of time (for example, 30 minutes). That is, in this case, the hardware measurement percentage HWP can be directly selected to set the initial power percentage. Therefore, after adjusting the three levels of trust based on battery usage / history information, time information, aging factor, and / or temperature information, the method can set the initial power percentage accordingly. In addition, for example, if it is detected that the power consumption of a battery connected to the charger device is less than a low power threshold (for example, 5mAH, but is not limited thereto), the method can adjust the level of trust. In addition, for example, if it is detected that the voltage difference between the new battery cell voltage and the previous battery cell voltage is greater than a voltage threshold (for example, 20 mV, but is not limited thereto), the method can adjust the level of confidence. None of these examples is a limitation of the invention. Battery usage / history information includes battery status history.

Based on battery usage / history information, time information, aging factor, and / or temperature information, this method can more accurately determine or configure the battery's initial charge percentage. For example, in the first scenario, as shown in FIG. 7, the method determines / detects that the system is enabled or started and no charger is connected to the battery, that is, no charger is inserted into the battery. In this scenario, the method is set to detect whether the battery has been removed or replaced. If it is detected that the battery has not been removed (step 705), the method is set to check / detect the system off time of the battery (step 710) to determine whether the system off time exceeds a certain period of time, such as 30 minutes (Step 713). The system shutdown time refers to the time period from the last time the system was shut down (disabled) to the current time when the system was turned on (enabled). If the system shutdown time exceeds 30 minutes, then proceed to step 715, the method is set to set the trust level of the hardware measurement percentage HWP to the highest level, and use the hardware measurement percentage HWP as the initial battery percentage. And the method can be set to display the previous power percentage RTCP minus the percentage gap for the user. In contrast, if the system shutdown time is less than 30 minutes, step 720 is performed, and the method is set to set the trust level of the previous power percentage RTCP to the highest level and use the previous power percentage RTCP as the initial power percentage of the battery. At the same time, the method is set to display the previous power percentage RTCP for the user.

In the second scenario, as shown in Figure 8, the method determines / detects that the system is enabled or started under temperature conditions where the temperature conditions when the system is disabled are different when no charger is connected to the battery. In this scenario, the method is set to detect whether the battery has been removed or replaced. If it is detected that the battery has not been removed (step 805), the method is set to check / detect the temperature difference between the battery temperature when the system was last disabled and the current battery temperature when the system is re-enabled (step 810), It is determined whether the temperature difference is above a temperature threshold (step 815). If the temperature difference does not exceed the temperature threshold, step 820 is performed and the method is set to time check / detect the system shutdown time for the battery. The method is set to determine whether the system shutdown time exceeds a specific time period, such as 30 minutes (step 825), and if the system shutdown time exceeds a specific time period, such as 30 minutes, then continue to step 830, the method is set by setting the hardware The confidence level of the measurement percentage HWP is the highest level, and the hardware measurement percentage HWP is used as the initial battery percentage. And the method can be set to display the previous power percentage RTCP minus the percentage gap for the user. In contrast, if the system shutdown time is less than 30 minutes, step 835 is executed, and the method is set to set the trust level of the previous power percentage RTCP to the highest level, and use the previous power percentage RTCP as the initial power percentage of the battery. At the same time, the method is set to display the previous power percentage RTCP for the user. However, in the second scenario, if the temperature difference is higher than the temperature threshold, step 840 is performed, and the method is set based on the trust level of the previous power percentage RTCP, the hardware measurement percentage HWP, and the software measurement percentage SWP from the previous power percentage Select one of RTCP, hardware measurement percentage HWP, and software measurement percentage SWP as the battery's initial charge percentage.

In a third scenario, as shown in Figure 9, the method determines / detects that no charger is connected to the battery and the battery is removed. In this scenario, the method is set to detect whether the battery has been removed or replaced. If it is detected that the battery has been removed, the method is set to detect / check specific information of the battery, such as the battery identification, the chemical composition of the battery, or the characteristics of the battery to select the corresponding battery parameter (step 905). After determining the battery parameters, the method is set to detect whether the battery has been removed or replaced. In this scenario, the method can detect that the battery has been removed. The method is then set to detect or check the battery removal time (step 910). After detecting the battery removal time, the method is set to compare and determine whether the battery removal time exceeds a certain time period, such as 30 minutes (step 915). If the battery removal time is less than 30 minutes, then proceed to step 920, the method is set to detect / check the temperature difference between the battery temperature when the system was last disabled and the current battery temperature when the system is re-enabled to determine the temperature Whether the difference is above the temperature threshold Temp (step 925). If the temperature difference does not exceed the temperature threshold Temp, step 930 is performed, and the method is set to be based on the trust level of the previous power percentage RTCP, the hardware measurement percentage HWP, and the software measurement percentage SWP from the previous power percentage RTCP, the hardware measurement percentage HWP, and Select one of the software measurement percentage SWP as the battery's initial charge percentage. If the temperature difference is higher than the temperature threshold Temp, step 935 is performed, and the method is set to set the trust level of the hardware measurement percentage HWP to the highest level, and use the hardware measurement percentage HWP as the initial battery percentage. And the method is set to display the hardware measurement percentage HWP for the user. However, if the battery removal time is greater than 30 minutes, proceed to step 940, the method is set to set the trust level of the hardware measurement percentage HWP to the highest level, and use the hardware measurement percentage HWP as the battery's initial charge percentage. And the method is set to display the hardware measurement percentage HWP or the previous power percentage RTCP for the user.

In the fourth scenario, the method can determine / detect that there is a charger plugged / unplugged between the current time when the system was last turned off (disabled) and the system turned on (enabled) to determine the initial percentage of battery power. The method may be set to determine whether a charger circuit is inserted. When a charger circuit is detected, the method is set to perform a hardware measurement percentage estimation using the charger circuit and use the measurement result of the charger circuit as the initial charge percentage of the battery. Conversely, if it is detected that the charger circuit was previously inserted but is now unplugged, the method is set to set the level of trust of the hardware measurement HWP percentage or software measurement SWP to the highest level, using hardware measurement HWP percentage or software measurement The percentage SWP is used as the initial power percentage. At the same time, the method can be set to display the hardware measurement percentage HWP or software measurement percentage SWP for the user.

In a fifth scenario, the method can determine / detect that there is a charger inserted between the current time when the system was last turned off (disabled) and the system was turned on (enabled) to determine the initial percentage of battery power. The method may be set to determine whether a charger circuit is inserted. When a charger circuit is detected, the method is set to perform a hardware measurement percentage estimation using the charger circuit and use the measurement result of the charger circuit as the initial charge percentage of the battery. Conversely, if it is detected that the charger circuit was previously inserted but is now unplugged, the method is set to set the level of trust of the hardware measurement HWP percentage or software measurement SWP to the highest level, using hardware measurement HWP percentage or software measurement The percentage SWP is used as the initial power percentage. At the same time, the method can be set to display the hardware measurement percentage HWP or software measurement percentage SWP for the user.

It should be noted that this method may be set to determine the battery power percentage based on the combined scenario of the different scenarios described above. That is, the method can more accurately determine the percentage of the battery's power based on at least one of information such as charger insertion / removal, battery insertion / removal, temperature difference, system shutdown time, and battery removal time. The above scenario is not a limitation on the present invention.

The method in FIG. 3 to FIG. 6 or at least one of the steps may be performed by a controller or a microcontroller executing a corresponding program code loaded from a memory device such as a register circuit. For example, the controller 210 of FIG. 2 may be configured to load code from the memory device 205 and execute the code to perform at least one step, thereby rating / adjusting / setting a trust level to dynamically select one of three percentages as a battery Initial battery percentage. Further description will not be repeated here.

In addition, in some cases, the battery has a SOC (State of Charge) or DOD (Discharge Depth) percentage that may be mistaken for a higher SOC / DOD percentage or a lower SOC / DOD percentage. For example, a 100% SOC may be mistaken for a 30% SOC, or a 40% SOC may be mistaken for a 100% SOC. In these cases, you can only wait for a longer convergence time to complete the calibration, and you can only successfully calibrate or adjust the estimated battery power percentage using voltage-based fuel gauge calculations; in fact, this convergence time can be equal to three Ten minutes or an hour. It is very inconvenient for the user to wait for such a long time to obtain an accurate battery charge percentage.

In order to solve the above problems, in the embodiment of the present invention, the power management device 200 may be configured to quickly or quickly perform compensation / calibration based on the information measured by the second electric quantity measurement operation, and the second electric quantity measurement is performed. The operation is different from the first electric quantity measurement operation. The first power measurement operation may be a voltage-based power measurement operation, and the second power measurement operation is a coulomb-based power measurement operation. However, the above is not a limitation on the present invention. The first electric quantity measurement may also be an electric quantity calculation operation based on a coulomb meter, and the second electric quantity measurement may also be a voltage-based electricity quantity calculation operation.

In an embodiment of the present invention, the power management device 200 is configured to use and execute a coulomb-based power measurement operation to measure and obtain accurate information, such as the accurate value of the amount of power / electric energy charged or discharged by the battery 201 and / or An accurate battery current value of the battery 201. For example, the value of the amount of electricity / electric energy charged or discharged by the battery 201 may be measured periodically. The battery current through the battery 201 may be a transient or average measured battery current. For example, the power management device 200 uses the accurate value of the amount of electricity / electric energy charged or discharged from the battery 201, and infers the accurate battery current value through the battery 201, and then uses the derived battery current value to calculate the correctness of the battery 201 Accurate battery cell voltage. The power management device 200 can finally obtain or obtain the accuracy / correctness of the battery 201 by referring to the mapping table (or mapping curve) that defines the relationship between the battery cell voltage of the battery 201 and the percentage of battery power according to the correct / accurate battery cell voltage value Of battery power. Similarly, the power management device 200 may directly use the accurate battery current value measured by the coulomb-based coulometry calculation to calculate the correct / precise battery cell voltage value of the battery 201. In addition, after calculating the correct / accurate battery cell voltage value, the power management device 200 may use such correct / accurate battery cell voltage value to calibrate or adjust the percentage of battery power measured by a coulomb-based fuel gauge operation.

FIG. 10 is a flowchart of a first operation example of the controller 210 based on coulomb-meter-based power measurement operation information. The controller 210 is configured to perform a voltage-based power measurement operation to obtain a correct percentage of battery power. As long as the substantially the same result can be achieved, the order of the steps of the flowchart shown in FIG. 10 need not be strictly in the order shown and need not be continuous, that is, there may be other steps in the middle. The detailed steps of Figure 10 are as follows:

Step 1005: Start;

Step 1010: The controller 210 executes a voltage-based electric quantity measurement operation to generate or estimate a first value of the electric quantity / electric energy charged or discharged by the battery 201;

Step 1015: The controller 210 performs a coulomb-meter-based power measurement operation to generate or measure a second value of the power / electric energy charged or discharged by the battery 201;

Step 1020: The controller 210 determines whether to perform fast compensation / calibration on the voltage-based energy measurement operation; if so, proceeds to step 1025; otherwise, proceeds to step 1010;

Step 1025: The controller 210 uses the second value of the electric quantity / electric energy measured by the coulomb-based electric quantity calculation operation to perform a voltage-based electric quantity calculation operation in order to derive and calculate an accurate battery cell voltage value of the battery 201;

Step 1030: The controller 210 obtains the accurate battery power percentage of the battery 201 by referring to a mapping table that defines the relationship between the battery cell voltage and the battery power percentage according to the accurate battery cell voltage value;

Step 1035: End.

In step 1020, for example, the controller 210 is set to calculate a difference between the first value and the second value, and determine whether the difference ratio is higher than a specific threshold value in order to decide whether to perform fast compensation / calibration. However, the above is not a limitation on the present invention. The controller 210 may also be arranged to trigger the execution of fast compensation / calibration based on other algorithms. For example, the specific threshold is 1% or 0.5%. If the difference ratio is higher than 1% or 0.5%, step 1025 is continued; otherwise, step 1010 is continued, and the controller 210 repeats step 1010 and step 1015.

In step 1025, the controller 210 derives and calculates an accurate battery cell voltage value of the battery 201 by using the second value of the electric quantity / electric energy measured through a fuel metering operation based on a coulomb counter. For example, the controller 210 calculates a battery cell voltage value based on the following equation:

Among them, ΔCAR represents the value of electricity / electricity measured by the coulometric calculation based on the coulomb counter during the time interval ΔT, and I1 represents the battery current through the battery 201. Regardless of whether the battery 201 is being charged or discharged, Vbat represents the external battery voltage. Vbat is measured based on the voltage-based coulometry calculation, R represents the resistance of the sensing resistor obtained using the voltage-based coulometry calculation, and Vzcv represents the battery cell voltage value of the battery 201 to be calculated / derived. As an example, the sense resistance is included in the battery 201; that is, the resistance of the sense resistance is the equivalent resistance of the battery 201. Since the voltage-based power measurement operation can be set to calculate the first value of power / electricity, the present invention equally uses the second value of power / electricity instead of the first value of power / electricity.

After obtaining the accurate battery cell voltage value Vzcv of the battery 201, in step 1030, the controller 210 may directly obtain or obtain the accurate battery cell voltage value by referring to a mapping table that defines the relationship between the battery cell voltage and the percentage of power. Battery 201 is a precise percentage of battery power. The mapping table that defines the relationship between the battery cell voltage and the percentage of battery power is established based on the fuel gas quantity calculation operation of the voltage.

In another embodiment, the controller 210 may decide to perform fast compensation / calibration on the voltage-based fuel gauge operation in response to a temperature change, a change in a battery aging factor, and / or a change in an initial state. For example, when the system is reconnected to the battery and / or the battery is initially used, the controller 210 may perform quick compensation / calibration on the voltage-based fuel gauge operation when performing such a voltage-based fuel gauge operation.

FIG. 11 is a flowchart of a second operation example of a controller using a coulomb-based fuel gauge calculation information, the controller is used to perform a voltage-based fuel gauge calculation to obtain a correct percentage of battery power. As long as the basically the same result can be achieved, the order of the steps of the flowchart shown in FIG. 11 need not strictly follow the order shown and need not be continuous, that is, there may be other steps in the middle. The detailed steps of Figure 11 are as follows:

Step 1105: Start;

Step 1110: The controller 210 executes a voltage-based electric quantity measurement operation to generate or estimate a first value of the electric quantity / electric energy charged or discharged by the battery 201;

Step 1115: The controller 210 determines whether to perform fast compensation / calibration on the voltage-based fuel-gauge operation according to a temperature change, a change in a battery aging factor, and / or a change in an initial state of the battery. If yes, continue to step 1120, otherwise continue to step 1110;

Step 1120: The controller 210 performs a coulomb-meter-based power measurement operation to generate or estimate a second value of the power / electric energy charged or discharged by the battery 201;

Step 1125: The controller 210 derives and calculates the accurate battery cell voltage value of the battery 201 by using the second value of the electric quantity / electric energy measured based on the coulometric calculation of the coulomb counter;

Step 1130: The controller 210 obtains an accurate battery power percentage of the battery 201 by referring to a mapping table defining a relationship between the battery cell voltage and the battery power percentage according to the accurate battery cell voltage value;

Step 1135: End.

In addition, in step 1115, the controller 210 may be further configured to periodically perform fast compensation / calibration on the voltage-based fuel-gauge operation.

In addition, in other embodiments, the controller 210 may be configured to perform a fast voltage-based fuel-gauge operation with reference to a battery current measured by a coulomb-based fuel-gauge operation when performing such a voltage-based fuel gauge operation Compensation / calibration performs quick compensation / calibration.

FIG. 12 is a flowchart of a third operation example of a controller based on coulometric calculation information of a coulometer, the controller is used to perform a voltage-based fuel measurement operation to obtain a correct percentage of battery power. As long as the basically the same result can be achieved, the order of the steps of the flowchart shown in FIG. 12 need not strictly follow the order shown and need not be continuous, that is, there may be other steps in the middle. The detailed steps of Figure 12 are as follows:

Step 1205: Start;

Step 1210: The controller 210 executes a voltage-based electric quantity measurement operation to generate or estimate a first value of the electric quantity / electric energy charged or discharged by the battery 201;

Step 1215: The controller 210 performs a coulomb-meter-based power measurement operation to generate or measure a second value of the power / electric energy charged or discharged by the battery 201;

Step 1220: The controller 210 determines whether to perform fast compensation / calibration on the voltage-based power measurement operation; if so, proceed to step 1225, otherwise proceed to step 1210;

Step 1225: The controller 210 performs a voltage-based fuel gauging operation by using the second value of the power / electric energy measured based on the coulometric operation of the coulomb counter, so as to derive and calculate an accurate battery cell voltage value of the battery 201;

Step 1230: The controller 210 obtains the accurate battery power percentage of the battery 201 by referring to the mapping table defining the relationship between the battery cell voltage and the battery power percentage according to the accurate battery cell voltage value;

Step 1235: End.

In step 1225, the controller 210 derives and calculates an accurate battery cell voltage value of the battery 201 by using the battery current I1 measured by a coulometric calculation based on a coulomb counter. For example, the controller 210 calculates the value of the battery cell voltage based on the following formula:

To summarize the embodiments of Figs. 1 and 2. As shown in FIG. 10 to FIG. 12, when the first power measurement operation is performed to estimate the battery power percentage, the controller 210 may be set to be measured by the second power measurement operation (for example, a coulomb-based power measurement operation). Information (such as battery current and / or charge / energy) to perform fast / rapid compensation / calibration on the first fuel gauge calculation (such as voltage-based fuel gauge calculations) to directly and quickly calculate the precise battery cell of battery 201 Voltage value in order to use accurate battery cell voltage values and quickly obtain / generate the correct percentage of battery power based on the above mapping table. The power management device 200 can quickly obtain the correct percentage of battery power by performing quick compensation / calibration while referring to the mapping table at the same time. Therefore, the power management device 200 only needs to wait for less time to obtain the correct battery power percentage.

Although the embodiments of the present invention and the advantages thereof have been described in detail, it should be understood that various changes, substitutions and alterations can be made to the present invention without departing from the spirit of the present invention and the scope defined by the scope of patent application. The described embodiments are for illustrative purposes only and are not intended to limit the invention in all respects. The scope of protection of the present invention shall be determined by the scope of the appended claims. Those skilled in the art can make some modifications and retouching without departing from the spirit and scope of the present invention. The above description is only a preferred embodiment of the present invention, and all equivalent changes and modifications made in accordance with the scope of patent application of the present invention shall fall within the scope of the present invention.

105, 110, 115, 120, 125, 130, 305, 310, 315, 320, 325, 330, 335, 405, 410, 415, 420, 425, 430, 435, 440, 445, 450, 455, 460, 465,470,475,480,485,490,505,510,515,520,525,530,535,540,545,550,555,560,565,570,575,605,610,615,620, 625, 630, 635, 640, 645, 650, 655, 660, 665, 705, 710, 713, 715, 720, 805, 810, 815, 820, 825, 830, 835, 840, 905, 910, 915, 920, 925, 930, 935, 940, 1005, 1010, 1015, 1020, 1025, 1030, 1035, 1105, 1110, 1115, 1120, 1125, 1130, 1135, 1205, 1210, 1215, 1220, 1225, 1230, 1235‧‧‧step

200‧‧‧Power Management Device

201‧‧‧ Battery

205‧‧‧Memory device

210‧‧‧ Controller

FIG. 1 shows a flowchart of a method for obtaining a battery power percentage according to a first embodiment of the present invention; FIG. 2 is a schematic diagram of a power management device for obtaining a battery power percentage according to the flowchart of FIG. 1; FIG. 3 shows a flowchart of a method for obtaining a percentage of battery power according to a second embodiment of the present invention. Figures 4A and 4B are flowcharts of a first example of the method shown in Figure 3; Figure 5 is a flowchart of a second example of the method shown in Figure 3; Figures 6A and 6B are third A flowchart of a third example of the method shown in the figure; Figures 7, 8 and 9 are based on battery usage / history information, time information, aging factor, and / or temperature information to determine or configure the battery's initial charge percentage Flowchart of the implementation in different scenarios. FIG. 10 shows a flowchart of a first operation example of a controller using a coulomb-based fuel-gauge calculation information in FIG. 2, which is used to perform a voltage-based fuel-gauge calculation to obtain a correct percentage of battery power . FIG. 11 shows a flowchart of a second operation example of the controller using the coulomb-based fuel gauge calculation information in FIG. 2, which is used to perform a voltage-based fuel gauge calculation to obtain a correct percentage of battery power . FIG. 12 shows a flowchart of a third operation example of the controller using the coulomb-based fuel gauge calculation information in FIG. 2, which is used to perform a voltage-based fuel gauge calculation to obtain the correct battery percentage .

Claims (10)

A method for obtaining a battery power percentage, comprising: performing a first power measurement operation on the battery to measure the battery power percentage; and using the first information obtained by referring to a second power measurement operation performed on the battery, using the first The fuel gauge calculation obtains a battery power percentage; wherein the second fuel gauge calculation is different from the first fuel gauge calculation. The method for obtaining the percentage of battery power as described in item 1 of the scope of patent application, wherein the first power measurement operation is a voltage-based power measurement operation, and the second power measurement operation is a coulomb-based power measurement operation. The method for obtaining a battery power percentage as described in item 1 of the scope of patent application, wherein the step of obtaining the battery power percentage by using the first power measurement operation by referring to information obtained by performing a second power measurement operation on the battery Specifically, the method includes: using a second electric quantity measurement operation to obtain the electric quantity or electric energy of the battery charged or discharged during a preset time interval; calculating a battery cell voltage of the battery by referring to the electric quantity or electric energy; and obtaining the battery of the battery according to the calculation For the cell voltage, a battery power percentage is obtained by referring to a mapping table obtained by the first power measurement operation, where the mapping table defines a relationship between the battery cell voltage and the battery power percentage obtained by the calculation. The method for obtaining the percentage of battery power as described in item 3 of the scope of patent application, wherein the step of calculating the battery cell voltage of the battery by referring to the amount of power or electrical energy specifically includes: obtaining according to the amount of power or electrical energy and a preset time interval Battery current; and calculating a battery cell voltage of the battery based on the battery current, the battery resistance, and an external battery voltage obtained through a first electricity measurement operation. The method for obtaining a battery power percentage as described in item 1 of the scope of patent application, wherein the step of obtaining the battery power percentage by using the first power measurement operation by referring to information obtained by performing a second power measurement operation on the battery Specifically, the method includes: obtaining a battery current using a second electric quantity measurement operation; calculating a battery cell voltage of the battery by referring to the battery current; and a mapping table obtained by referring to the first electric quantity measurement operation according to the battery unit voltage of the battery obtained according to the calculation To obtain the battery power percentage, where the mapping table defines the relationship between the battery cell voltage of the battery and the battery power percentage obtained by the calculation. The method for obtaining a percentage of battery power as described in item 5 of the scope of patent application, wherein the step of calculating the battery cell voltage of the battery by referring to the battery current specifically includes: according to the battery current, battery resistance, and the first power The external battery voltage obtained by the measurement operation calculates the battery cell voltage of the battery. The method for obtaining a percentage of battery power as described in item 1 of the scope of patent application, wherein the method further comprises: performing a first power measurement operation to obtain a first value of the amount of power or electrical energy charged or discharged by the battery; performing a second first The electric quantity measurement operation obtains a second value of the electric quantity or electric energy charged or discharged by the battery; and compares the first value with the second value to determine whether to trigger the step of acquiring the battery electric quantity percentage. The method for obtaining a percentage of battery power as described in item 1 of the scope of the patent application, wherein the step of comparing the first value with the second value to determine whether to trigger the acquisition of the percentage of battery power specifically includes: calculating the first A difference ratio between a value and the second value; and when the difference ratio is greater than a preset threshold, determining to enter the step of obtaining a battery power percentage. The method for obtaining a battery power percentage according to item 1 of the patent application scope, wherein the method further comprises: calibrating or adjusting the battery power percentage obtained according to the second power measurement operation using the battery power percentage obtained according to the first power measurement operation Another battery charge percentage. A power management device for obtaining a battery power percentage includes: a memory device; a controller coupled to the memory device and configured to load code from the memory device to perform the following steps; for the battery Performing a first power measurement operation for measuring a battery power percentage; using the first power measurement operation to obtain a battery power percentage by referring to information obtained from a second power measurement operation performed on the battery; wherein the second power measurement operation is performed This is different from the first electric quantity measurement operation.