JP3640142B2 - Battery level indicator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery remaining amount display device, and more particularly to a battery remaining amount display device mounted on an electric vehicle.
Examples of the electric vehicle include an electric wheelchair, an electric tricycle, a two-wheeled vehicle, a four-wheeled vehicle, and an electric assist bicycle.
[0002]
[Prior art]
Conventionally, there has been a method for calculating a remaining battery level based on battery terminal voltage data. This is to calculate the remaining amount of the battery by utilizing the fact that the value of the battery terminal voltage decreases according to the discharge characteristics of the battery when the remaining amount of the battery decreases.
In addition, there is a method of calculating the remaining amount of battery by integrating the amount of current consumed by the battery and subtracting the amount of current consumed from the total amount of charging current.
[0003]
[Problems to be solved by the invention]
However, in the method of calculating the remaining amount of battery from the terminal voltage of the battery using the discharge characteristics of the battery, when the battery deteriorates and the maximum capacity decreases, or immediately after charging or when the battery is left unattended However, since the discharge characteristics of the battery change, there is an inconvenience that an accurate battery remaining amount cannot be displayed.
[0004]
Also, in the conventional example in which the current consumption amount of the battery is subtracted, if the deterioration of the battery progresses or if the difference between the calculated charge current amount and the current consumption amount becomes large, it is accurate. There was an inconvenience that the remaining battery charge could not be displayed.
[0005]
OBJECT OF THE INVENTION
The present invention improves the inconveniences of the conventional example, and in particular, provides a battery remaining amount display device capable of accurately displaying the remaining amount of battery that changes according to the deterioration state of the battery, the use environment, or the change of the use state. The purpose is to do.
[0006]
[Means for Solving the Problems]
Therefore, in the present invention, the remaining amount calculation means for each current amount that calculates the remaining amount for each current amount of the battery based on the consumed current amount and the charging current amount of the battery mounted on the electric vehicle, and the remaining amount for each current amount And a remaining amount display unit for displaying a remaining battery level corresponding to the remaining amount by current amount calculated by the calculating unit. In addition, a remaining amount by voltage value calculating unit that calculates a remaining amount by voltage value based on a predetermined discharge characteristic of the battery based on a voltage value and a current value of the battery, and the remaining amount calculating unit by voltage value is calculated by the voltage value remaining amount calculating unit. The remaining amount by voltage value and the remaining amount by current amount calculated by the remaining amount by current amount calculating unit, and both remaining amount values compared by the remaining amount comparison unit When the difference between the two is smaller than a predetermined threshold, the remaining amount by current amount is determined as the remaining battery level, and the remaining amount determining unit outputs the remaining battery level to the remaining amount display unit. The structure is taken. Thus, the above-described purpose is achieved.
[0007]
Here, the remaining amount comparison means includes a battery remaining amount (here, referred to as a remaining amount by current amount) due to a difference between the current consumption amount and the charging current amount of the battery, a battery terminal voltage, and a discharge characteristic of the battery. Is compared with the remaining battery level (referred to herein as the remaining voltage level). The remaining amount determination means determines the remaining amount by current amount as the remaining battery amount when the difference between both remaining amount values is smaller than a predetermined threshold value, and determines the remaining battery amount as the remaining amount. Output to the display means. In this way, the value of the remaining amount by current amount and the value of the remaining amount by voltage value are mutually monitored, and when both values substantially coincide with each other, the remaining amount is displayed.
[0008]
If the difference between Ryozanryou value is greater than a predetermined threshold value, it may be displayed the smaller value of the two Zanryouchi, With reference to the one value, You may make it correct | amend based on the other value. In a preferred embodiment, the remaining amount by current amount is corrected in accordance with the magnitude of the difference from the remaining amount by voltage value and the remaining amount itself with the remaining amount by current amount as a reference. In other words, when the difference between the remaining amount values calculated by the remaining amount comparing means is equal to or greater than the threshold value, the remaining amount determining means determines the remaining amount by current amount until the remaining difference becomes less than the threshold value. When the difference between the correction function for subtracting the remaining amount and the remaining amount value calculated by the remaining amount comparison means is greater than or equal to the threshold value, after waiting for a waiting time of the length corresponding to the difference in the remaining amount, the subtraction process by the correction function And a first correction timing setting function. This waiting time is set to a short waiting time when the difference in the remaining amount is large, and is set to a long waiting time when the difference in the remaining amount is small.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0010]
FIG. 1 is a block diagram showing a configuration of a battery remaining amount display device according to the present invention. The battery remaining amount display device includes a current amount-dependent remaining amount calculating unit 4 that calculates a remaining amount for each current amount of the battery based on a consumption current amount and a charging current amount of a battery mounted on the electric vehicle, and a voltage value of the battery. And a voltage value-based remaining amount calculating means 6 for calculating a remaining amount by voltage value based on a predetermined discharge characteristic of the battery based on the current value. A remaining amount value comparing unit that compares the remaining amount by voltage value calculated by the remaining amount calculating unit by voltage value and the remaining amount by current amount calculated by the remaining amount calculating unit by current amount; When the difference between the remaining amount values compared by the comparing means is smaller than a predetermined threshold value, the remaining amount by current amount is determined as the remaining battery amount and the remaining battery amount is output to the remaining amount display means. A remaining amount determining unit and a remaining amount displaying unit 12 for displaying the remaining battery level determined by the remaining amount determining unit are provided. In the example shown in FIG. 1, the two calculation methods are mutually monitored by comparing the remaining amount by current amount and the remaining amount by voltage value, and the remaining battery amount is displayed when more accurate.
[0011]
FIG. 2 is a block diagram showing the configuration of the remaining amount determining means 10 for correcting the value of the remaining amount by current amount when the difference between the remaining amount by current amount and the remaining amount by voltage value is larger than a predetermined threshold value. FIG. In the example illustrated in FIG. 2, when the remaining amount determination unit 10 determines that the difference between the remaining amount values calculated by the remaining amount comparison unit 8 is equal to or greater than the threshold value, the difference in the remaining amount is less than the threshold value. A correction function 18 is provided to subtract the remaining amount by current amount until. Thus, for example, even when the full capacity is reduced due to the deterioration of the battery and calculated more than the actual charging current amount, it is possible to obtain a rough value based on the remaining amount by voltage value. By making corrections, it is possible to display a more accurate remaining battery level.
[0012]
Further, in a desirable example, the remaining amount determining means 10 waits for a length corresponding to the difference in the remaining amount when the difference in the remaining amount value calculated by the remaining amount comparing means 8 is equal to or larger than the threshold value. A first correction timing setting function 14 for performing subtraction processing by the correction function 18 after waiting for a time is provided. The waiting time may be set to a short waiting time when the difference in the remaining amount is large, and set to a long waiting time when the difference in the remaining amount is small. In this example, when the difference between the remaining amount by current amount and the remaining amount by voltage value is small, the remaining amount is corrected slowly so that the display becomes natural. Yes. In addition, when the difference is large, the display that is not appropriate is immediately corrected to improve the display accuracy.
[0013]
Furthermore, the remaining amount determining means 10 is a case where the remaining amount by voltage value itself is smaller than a predetermined value even when a long standby time is set by the first correction timing setting function. It is preferable to provide a second correction timing setting function for resetting to a short standby time. In this example, if there is a difference between the two remaining amount values when the remaining amount of the battery is low, a correction is made rapidly to immediately notify that the remaining amount is low.
[0014]
Next, an embodiment in the case of an electric vehicle will be described.
[0015]
As shown in FIG. 3, the battery remaining amount display device according to the present embodiment includes first and second motors 28 and 30 for driving an electric vehicle, a main controller for controlling the rotation amount of the motor, and the main controller 26. And first and second batteries 32 and 34 for supplying electric power to each motor, and a joystick controller 20 for transmitting a drive command to the main controller. The first and second motors input the rotational speed of the motor to the main controller 26.
[0016]
The joystick controller 20 includes an operation knob 22 for controlling the traveling direction of the electric vehicle, a power switch 24, and a display panel 12 for displaying the remaining battery level. The joystick controller 20 outputs an accelerator signal and a maximum speed setting signal to the main controller. A charger 38 that supplies power to the batteries 32 and 34 is connected to the batteries 32 and 34 and the main controller 26 via a connector 42. The charger 38 has an AC plug 40. In the example shown in FIG. 3, the first battery 32 is equipped with a temperature sensor 36. This temperature sensor 36 measures the temperature of the battery and outputs it to the main controller.
[0017]
As shown in FIG. 4, the main controller 26 stores discharge characteristic data of the batteries 32 and 34 and a battery remaining amount calculation program and is supplied from the one-chip microcomputer 50 that operates according to the program and data and the batteries 32 and 34. The power supply circuit 46 converts the voltage of the generated power into a control voltage, and a current detection circuit 48 that amplifies the voltage across the shunt resistor 52 and outputs the amplified voltage to the A / D input port of the microcomputer 50. The microcomputer 50 cumulatively calculates the value output from the A / D input port, and calculates the current consumption amount and the charging current amount.
When calculating the amount of charging current, the microcomputer 50 preferably has a function of stopping the integration of the amount of charging current at the value when the amount of charging current when charging the battery exceeds a predetermined upper limit value. This is because the amount of charge is generally higher than the amount of discharge, so by setting an upper limit value for the remaining battery level and preventing the calculated remaining battery level from increasing further, the actual remaining battery level can be reduced. The possibility of exceeding the value is reduced.
[0018]
Since the capacity of the battery varies depending on the temperature, the upper limit value of the remaining amount data may be calculated according to the discharge characteristic data at each temperature. Further, the microcomputer 50 may be provided with a table storing the upper limit value for each temperature. When the battery temperature sensor is not connected, the battery temperature Tb may be calculated as a certain temperature. The Tb in the state where the temperature sensor is not connected or disconnected is set to the condition of the smallest capacity normally used, for example, 0 degrees.
[0019]
The microcomputer 50 operates according to a program stored in advance, thereby realizing each means and each function of the control system shown in FIG. When the power switch 24 of the joystick controller 20 is turned on, power is supplied to the control system of the joystick controller and the main controller, and the one-chip microcomputer built in both is activated. The main controller 26 detects the battery terminal voltage, the battery consumption current, the battery charging current, and the battery temperature, and calculates the remaining battery capacity based on these data. Since the battery capacity changes and the discharge characteristics change due to the change in the battery temperature, the microcomputer 50 may be provided with discharge characteristic data for each battery temperature. Further, the microcomputer 50 sends the calculation result of the remaining battery level to the joystick controller, and the remaining battery level data is displayed by the joystick controller.
[0020]
The battery remaining amount display method includes an LED multi-point lighting method, a liquid crystal display, and a multiple order method using 7 segments. Further, as a numerical expression, there is a method of displaying as a remaining traveling distance, a remaining traveling time, a remaining battery capacity, and the like. FIG. 5 is an explanatory diagram for explaining the display panel (remaining amount display means) 12 according to this embodiment. As shown in FIG. 5 (A), the display panel 12 includes a battery fuel gauge that displays the remaining amount in six stages, and a time display meter that displays the time that can be traveled before the next charging. Yes. FIG. 5B shows the relationship between the display on the battery level indicator and the remaining battery level (denoted as capacity in the figure).
[0021]
In general, the battery voltage recovers and rises when the no-load state continues. Therefore, if the remaining battery level is calculated based only on the battery voltage, the remaining battery level will apparently increase due to such voltage recovery. In addition, when a load is generated after returning once, the voltage value rapidly decreases. Therefore, the voltage value and the current value are not constant immediately after the start of the operation of the electric vehicle. For this reason, in the present embodiment, the microcomputer (remaining amount determining means) determines the remaining amount by voltage value or the operation until a predetermined time elapses after the operation of the electric vehicle starts or a certain amount of power is consumed. It has a function of determining the lower one of the remaining amount by current amount before the start as the remaining battery amount.
[0022]
The point at which the battery remaining amount display is “0” is not limited to the 100% discharge state of the battery, but the 70% to 80% discharge state may be set to “0”. In particular, in the case of a dull battery, if the discharge rate of one time exceeds 70% to 80%, the life of the battery is remarkably reduced. To do. Further, even for the user, even if “0” is displayed on the fuel gauge, it is not impossible to travel, so that the user can use it with peace of mind.
[0023]
Next, the remaining battery level calculation process will be described with reference to the flowcharts of FIGS. When the power switch 24 of the joystick controller 20 is turned on, the microcomputer 50 of the main controller 26 is turned on, and the remaining amount calculation process is started (step S1). When started, the elapsed time t is first counted.
[0024]
Subsequently, the battery terminal voltage Vb, the battery consumption current Ib, and the battery temperature Tb are taken in from the A / D input of the microcomputer (step S2). Then, the microcomputer calculates the remaining amount Xn by voltage value based on the battery terminal voltage Vb, the battery consumption current Ib, the value of the battery temperature Tb, and predetermined battery discharge characteristic data (step S3). .
[0025]
Subsequently, it is determined whether or not the elapsed time t from the start has passed a predetermined time A [sec] (step S4). If not, the process returns to step S2. If it has elapsed, the process proceeds to step S5. The time t from the start in step S4 is referred to accurately even when the battery terminal voltage Vb is started from a state in which the battery terminal voltage Vb is likely to fluctuate in a short time, such as after the battery is left for a long time or after the end of charging. This is for displaying the remaining battery level. If the current consumption amount is subtracted on the basis of the remaining battery level data calculated from the battery terminal voltage immediately after the start, the battery current consumption Ib, and the battery temperature Tb without performing this operation, the battery terminal voltage Vb is obtained in a short time from the start. In the case of a sudden drop, the remaining amount cannot be calculated accurately.
[0026]
In step S5, it is determined whether or not the voltage value remaining amount Xn calculated according to the battery terminal voltage Vb or the like exceeds a predetermined amount. Also in step S5, as in step S4, the discharge characteristics differ depending on the state of the battery at that time. Therefore, data in a state where power is consumed to some extent is adopted as a reference value, so that X4 which is a predetermined remaining amount is used. The remaining amount determination process is performed after the value is lower than.
[0027]
For example, in the case of a battery whose capacity has decreased due to an increase in the internal resistance of the battery, the battery terminal voltage Vb in the no-load state immediately after charging is equal to a normal value, but in a state where a load is applied Vb is a lower value than normal. As described in step S4 and step S5, a state in which the battery has been consumed for a certain period of time or a certain place is used as a reference value for the remaining amount calculation, so that the unstable elements of the battery described above are eliminated and accurate remaining amount determination is performed. I am trying. In some embodiments, the display on the display panel 12 of the joystick controller 20 is not performed until a certain amount of time has elapsed and a certain amount has been consumed.
[0028]
When a certain time has elapsed from the start (step S4) and the value of the remaining amount Xn by voltage value based on the battery terminal voltage falls below a predetermined remaining amount X4 (step S5), the voltage value calculated immediately before The current consumption amount Yn is subtracted from the remaining amount Xn, and this is set as the remaining amount Xn + 1 by current amount (step S6).
[0029]
Next, the battery terminal voltage Vb, the battery consumption current Ib, and the battery temperature Tb are taken in from the A / D input of the microcomputer 50 (step S7). Then, the remaining amount Xs by voltage value is calculated with reference to the discharge characteristic data by temperature of the battery (step S8). Then, the difference between the remaining amount by current amount Xn + 1 and the remaining amount by voltage value Xs is calculated, and if this difference is smaller than a predetermined value B, the remaining amount by current amount Xn + 1 is used as the remaining battery amount. It outputs to the display panel 12 (step S11). After displaying the remaining battery level, the process returns to step S6. On the other hand, when the difference Xn + 1−Xs between the remaining amount values is larger than a predetermined value B, correction calculation is performed on the remaining amount Xn + 1 by current amount.
[0030]
FIG. 7 is a flowchart illustrating a processing example in which correction is performed at the first correction timing. When the process proceeds to step S10 shown in FIG. 6, first, it is confirmed whether or not the correction flag is “H”. When the correction calculation is performed for the first time after the power is turned on, the correction flag is “L”, and the process proceeds to step S26. In steps S26 to S32, a setting for changing the correction timing according to the magnitude of the difference Xn + 1−Xs between the remaining amount values is performed. Here, assuming that Xe>Xd> Xc, the longer correction standby time is set in descending order of the difference in the remaining amount.
[0031]
That is, when the difference between the remaining amounts is equal to or greater than Xe, 1 is input to the “correction timer” (steps S26 and S27). If the difference in the remaining amount is less than Xe and Xd or more, 2 is input to the “correction timer” (steps S28 and S29), if it is less than Xd and Xc or more, 3 is input, and if it is less than Xc Enter 4 for. These values are times for waiting until the actual correction processing (step S24) is performed.
[0032]
Subsequently, the correction flag is set to “H” (step S34). Then, the process returns to the main routine shown in FIG. When the correction calculation described above is completed, Xn + 1 before correction is displayed in step S11 (step S11). Subsequently, the remaining amount by current amount Xn + 1 and the remaining amount by voltage value Xs are calculated again in steps S6 to S8, and it is determined whether or not the difference is equal to or less than a predetermined value B.
[0033]
When the process proceeds to the correction calculation process again, since the correction flag is “H” in step S22 of FIG. 7, the process proceeds to step S23. Here, in step S23, 1 is subtracted from the value input in step S27, S29 or S31 in the previous correction calculation, and this is used as the value of the “correction timer”. That is, the value of the correction timer is decremented. If the value of the correction timer is 0, a certain amount X is subtracted from the value of the remaining amount by current amount (step S24). As a result, the difference between the remaining amount by current amount Xn + 1 and the remaining amount by voltage value Xs is reduced. Subsequently, the correction flag is cleared (step S25).
[0034]
If a value of 2 or more is input to the correction timer, the value of the correction timer does not become “0” in step S23, and the process returns to the main routine again to calculate both remaining amounts. In this way, the value of the correction timer is subtracted in step S23, and the actual correction process (step S24) is performed after waiting until this value becomes 0. Therefore, when the difference in the remaining amount is large, the correction is performed quickly. Further, when the difference in the remaining amount is small, the correction is performed slowly, so that the change in the remaining amount to be displayed can be made natural.
[0035]
FIG. 8 is a flowchart showing an example in which the remaining battery level is corrected at the second correction timing. When used in combination with the first correction timing shown in FIG. 7, reference symbol A (step S33) shown in FIG. 8) is added to the processing shown in FIG. In the state of symbol A shown in FIG. 7, values 1 to 3 are already input to the correction timer. In the example shown in FIG. 8, when the remaining value by voltage value is small, the value input to the correction timer is further subtracted according to the small value. That is, when there is a large difference between the two remaining amounts when the remaining amount of the battery is low and charging is imminent, the correction is performed earlier than usual.
[0036]
In FIG. 8, X3>X2> X1. When the voltage-based remaining amount Xs exceeds X3, that is, when the remaining amount is still sufficient, correction is performed at the first correction timing shown in FIG. If the remaining voltage value Xs is less than X3 and X2 or more, “1” is subtracted from the value of the correction timer (step S42). If the value of the correction timer becomes 0, 1 is input to the correction timer (steps S43 and S46), and otherwise the process returns to the symbol A in FIG.
[0037]
If the remaining voltage value is less than X2 and X1 or more, the value of the correction timer is subtracted by “2” (step S45). Then, if the value of the correction timer becomes 0 or less, 1 is input to this (step S46). On the other hand, if it is 1 or more, the processing is returned to symbol A in FIG. On the other hand, when the remaining battery level by voltage value is less than X1, the value of the correction timer is forcibly set to 1 (step S46). By performing the processing shown in FIG. 8, the charging timing can be accurately displayed by performing the correction quickly when the remaining battery level is low.
[0038]
The battery remaining amount calculated in this way is calculated as it is when the power is turned on next time, for example, by storing it in the memory without turning off the calculation function regarding the remaining amount even when the power switch 24 of the joystick controller 20 is turned off. To continue. It is preferable to start from the start shown in FIG. 6 when the power is turned on only when the battery is disconnected or left for a certain time.
[0039]
At the time of charging, the charging current amount is added to the remaining amount data (Xn + 1). However, since the charge amount is generally larger than the discharge amount, the upper limit value of the remaining amount data is determined and the calculated battery remaining amount is not further increased. Further, since the capacity of the battery varies depending on the temperature, the upper limit value of the remaining amount data may be determined based on the battery temperature Tb at that time based on the discharge characteristic data at each temperature.
[0040]
As described above, according to the present embodiment, the remaining amount by current amount and the remaining amount by voltage value are mutually monitored and correction according to the situation is performed, so that the remaining amount of the battery with many unstable elements can be more accurately determined. Can be displayed. In addition, since it is based on the addition and subtraction of the current consumption amount and the charge current amount, even if the battery terminal voltage is in a high state immediately after fully charging a battery whose battery capacity has decreased due to long-term use or overdischarge, The battery remaining amount to be displayed is not a full charge display, but the amount of energy of the battery, that is, the information on the distance and time that can be traveled can be displayed more accurately.
[0041]
【The invention's effect】
Since the present invention is configured and functions as described above, according to this, the remaining amount value comparing means compares the remaining amount by current amount and the remaining amount by voltage value, and the remaining amount determining means has both remaining amounts. When the difference between the values is smaller than a predetermined threshold value, the remaining amount by current amount is determined as the remaining battery amount and the remaining battery amount is output to the remaining amount display means. The amount value and the remaining amount value by voltage value can be monitored each other, so that the remaining amount of the battery with many unstable elements can be displayed more accurately. Even if the amount of charge current during battery charging is added more than the actual value by correcting to reduce the difference when the difference is greater than a predetermined threshold, the voltage value The correct value can be calculated by correcting with the remaining amount, and the voltage When calculating the remaining amount according to the discharge characteristics in consideration of the battery temperature, the remaining amount according to the current amount can be corrected according to the battery temperature, and thus two types of calculation methods are used in combination. Thus, it is possible to provide an unprecedented excellent battery remaining amount display device capable of displaying a more accurate remaining battery amount as compared with the conventional case.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.
FIG. 2 is a block diagram showing a configuration example of a remaining amount determination unit 10 shown in FIG.
FIG. 3 is a block diagram showing a configuration of an embodiment of the present invention.
4 is a circuit diagram showing a configuration example of a current detection unit of the main controller shown in FIG. 3;
5 is an explanatory diagram for explaining the display panel shown in FIG. 3. FIG. 5 (A) is a diagram showing a display example on the display panel, and FIG. 5 (B) is a diagram showing display on the display panel. It is a figure which shows a meaning.
FIG. 6 is a flowchart illustrating an example of a main routine of battery remaining amount determination processing.
FIG. 7 is a flowchart illustrating an example of a remaining battery level correction process illustrated in FIG. 6;
FIG. 8 is a flowchart illustrating an example of a process for setting a second correction timing that can be added to the symbol A illustrated in FIG.
[Explanation of symbols]
4 Remaining amount calculation means by current amount 6 Remaining voltage calculation means by voltage value 8 Remaining value comparison means 10 Remaining amount determination means 12 Remaining amount display means 24 Power switch

Claims (3)

Calculated by a current amount-based remaining amount calculating means for calculating a remaining amount for each current amount of the battery based on the consumption current amount and the charging current amount of the battery mounted on the electric vehicle, and the remaining amount calculation means for each current amount. In a battery remaining amount display device comprising a remaining amount display means for displaying a predetermined battery remaining amount according to the remaining amount by current amount,
Calculated by a voltage value-based remaining amount calculating means for calculating a remaining amount by voltage value based on a predetermined discharge characteristic of the battery based on the voltage value and current value of the battery, and by this voltage value-based remaining amount calculating means. The remaining amount by voltage value and the remaining amount by voltage value calculated by the remaining amount calculating unit by current amount, and the remaining amount value compared by the remaining value comparison unit. When the difference is smaller than a predetermined threshold, the remaining amount by current amount is determined as the remaining battery level, and the remaining amount determining unit that outputs the remaining battery level to the remaining amount display unit ,
If the difference between the remaining amount values calculated by the remaining amount comparing means is greater than or equal to the threshold value, the remaining amount determining means determines the current amount difference until the remaining difference becomes less than the threshold value. When the difference between the correction function for subtracting the remaining amount and the remaining amount value calculated by the remaining amount comparing means is equal to or greater than the threshold value, after waiting for a waiting time of a length corresponding to the difference in the remaining amount, A first correction timing setting function for performing subtraction processing by the correction function,
The waiting time is set to a short waiting time when the difference in the remaining amount is large and set to a long waiting time when the difference in the remaining amount is small.
A battery remaining amount display device. The remaining amount determining means has a short waiting time when the remaining amount per voltage value is smaller than a predetermined value even when a long waiting time is set by the first correction timing setting function. The battery remaining amount display device according to claim 1, further comprising a second correction timing setting function for resetting the battery. Calculated by a current amount-based remaining amount calculating means for calculating a remaining amount for each current amount of the battery based on the consumption current amount and the charging current amount of the battery mounted on the electric vehicle, and the remaining amount calculation means for each current amount. In a battery remaining amount display device comprising a remaining amount display means for displaying a predetermined battery remaining amount according to the remaining amount by current amount,
Calculated by a voltage value-based remaining amount calculating means for calculating a remaining amount by voltage value based on a predetermined discharge characteristic of the battery based on the voltage value and current value of the battery, and by this voltage value-based remaining amount calculating means. The remaining amount by voltage value and the remaining amount by voltage value calculated by the remaining amount calculating unit by current amount, and the remaining amount value compared by the remaining value comparison unit. When the difference is smaller than a predetermined threshold, the remaining amount by current amount is determined as the remaining battery level, and the remaining amount determining unit that outputs the remaining battery level to the remaining amount display unit,
The remaining amount determining means is a voltage value remaining amount calculated by the voltage value remaining amount calculating means until a predetermined time elapses after the electric vehicle starts operating or until a certain amount of power is consumed. Or, with the function of determining the lower one of the remaining amount by current amount before the start of the operation as the remaining amount of battery ,
A battery remaining amount display device.

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