Display system, vehicle equipped with same, and method for displaying state of secondary battery

Abstract

To display the SOC and the full charge capacity of a secondary battery in an easily understandable way.SOLUTION: A vehicle 1 has an instrument panel 70 and an ECU 100 for controlling the instrument panel 70 to display an icon expressing the state of a battery 50. The icon expresses one of a first index expressing SOC of the battery 50 and a second index expressing a full charge capacity of the battery 50 by increase / decrease in a scale, and expresses the other index out of the first and second indexes by an amount shown according to the size of display areas of the icon.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a display system, a vehicle equipped with the same, and a method for displaying the state of a secondary battery. [Background technology]

[0002] The State of Charge (SOC) is widely used as an index to indicate the remaining battery power (remaining capacity) of a secondary battery. Furthermore, secondary batteries deteriorate with use, and the full charge capacity of the secondary battery decreases.

[0003] The SOC and full charge capacity of a secondary battery are particularly important indicators for users. However, in general electrical devices, it is rare for both the SOC and full charge capacity of a secondary battery to be displayed simultaneously on the same screen. For example, many smartphones always display the remaining battery level, but require a specific operation to display the full charge capacity.

[0004] On the other hand, if the SOC and full charge capacity decrease in a vehicle (such as an electric vehicle) equipped with a secondary battery, the vehicle's EV driving distance (the distance the vehicle can travel with the power stored in the secondary battery) may become excessively short. Therefore, to alleviate the user's anxiety, it is conceivable that the vehicle may display both the SOC and the full charge capacity. For example, Japanese Patent Laid-Open Publication No. 2011-257213 (Patent Document 1) discloses a battery display device that displays both the SOC and the full charge capacity of the battery (see FIG. 3 of Patent Document 1). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2011-257213 A Summary of the Invention [Problem to be solved by the invention]

[0006] If the SOC and full charge capacity of the secondary battery are displayed on the same screen at the same time, the user may confuse the two and may not be able to intuitively understand the displayed content. Therefore, it is desirable to display the SOC and full charge capacity of the secondary battery in an easy-to-understand manner.

[0007] The present disclosure has been made to solve such problems, and an object of the present disclosure is to provide a technique capable of displaying the SOC and full charge capacity of a secondary battery in an easily understandable manner. [Means for solving the problem]

[0008] (1) A display system according to an aspect of the present disclosure includes a display device and a control device that controls the display device to display an icon representing a state of a secondary battery. The icon represents one of a first indicator representing the remaining battery capacity of the secondary battery and a second indicator representing the full charge capacity of the secondary battery by increasing or decreasing a scale in a display area of ​​the icon, and represents the other of the first and second indicators by an amount indicated by a change in the size (change) of the display area of ​​the icon.

[0009] (2) The icon shows the first indicator by increasing or decreasing the scale, and the second indicator by the amount shown by the size of the icon's display area. As the first indicator decreases, the scale decreases. As the second indicator decreases, the icon's display area becomes smaller.

[0010] In the above configurations (1) and (2), the first index and the second index are represented by different icon features (increase or decrease in the scale / largeness or smallness of the icon display area). Therefore, compared to a case where both the first and second indexes are represented by a common feature (for example, a case where both are displayed by scales), it is easier to distinguish between the first index and the second index, and it is possible to prevent the user from confusing the two. Therefore, according to the above configurations (1) and (2), the SOC and full charge capacity of the secondary battery can be displayed in an easy-to-understand manner.

[0011] (3) The scale increases or decreases in a predetermined direction. The display area of ​​the icon changes as the shape of the icon changes in a direction perpendicular to the predetermined direction.

[0012] According to the above configuration (3), if the direction of increase / decrease of the icon's scale and the direction of change in the icon's display area are the same (for example, if both are vertical), there is a risk that the decrease in the icon's display area will be mistaken for a decrease in the scale. By making the two directions perpendicular to each other, the possibility of such a misinterpretation can be reduced.

[0013] (4) The shape of the icon is transformed in the perpendicular direction while maintaining the aspect ratio of the icon.

[0014] According to the above configuration (4), the shape of the icon is transformed (i.e., enlarged / reduced) while maintaining the aspect ratio of the icon, making it easier for the user to recognize the icon and allowing the SOC and full charge capacity of the secondary battery to be displayed in a more easily understandable manner.

[0015] (5) The icon shape is the outer shape of the battery case. The scale is displayed as a segment.

[0016] According to the above configuration (5), by using a battery-shaped icon to represent the state of the secondary battery and adopting a segment display that is familiar to many users, the SOC and full charge capacity of the secondary battery can be displayed in an even easier-to-understand manner.

[0017] (6) A vehicle according to another aspect of the present disclosure includes a secondary battery and the above-described display system.

[0018] According to the above configuration (6), it is possible to realize an easy-to-understand display of the SOC and full charge capacity of the secondary battery in the vehicle.

[0019] (7) A method for displaying a status of a secondary battery according to yet another aspect of the present disclosure displays the status of the secondary battery. The method for displaying a status of a secondary battery includes the steps of acquiring a first index representing a remaining battery level of the secondary battery, acquiring a second index representing a full charge capacity of the secondary battery, and displaying an icon representing the status of the secondary battery on a display device. The icon represents one of the first and second indexes by increasing or decreasing a scale in a display area of ​​the icon, and represents the other of the first and second indexes by an amount indicated by the size of the display area of ​​the icon.

[0020] According to the method of (7) above, like the configuration of (1) above, the SOC and full charge capacity of the secondary battery can be displayed in an easily understandable manner. Effect of the Invention

[0021] According to the present disclosure, the SOC and full charge capacity of a secondary battery can be displayed in an easily understandable manner. [Brief description of the drawings]

[0022] [Figure 1] 1 is a diagram illustrating an overall configuration of a system including a vehicle according to an embodiment of the present disclosure. [Diagram 2] 5 is a flowchart showing a battery display process in the present embodiment. [Diagram 3] FIG. 11 is a diagram for explaining a method for determining an icon size. [Figure 4] FIG. 13 is a diagram for explaining a method for determining the number of segments of an icon. [Diagram 5] FIG. 4 is a diagram showing an example of an icon displayed on an instrument panel. [Figure 6] 13A and 13B are diagrams for explaining other display modes of the icon size. [Figure 7] FIG. 11 is a diagram showing another example of an icon displayed on the instrument panel. [Figure 8] FIG. 13 shows an example of an icon further displaying the SOH of a battery. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, the present embodiment will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and their description will not be repeated.

[0024] [Embodiment Mode] <Overall system configuration> Fig. 1 is a diagram that illustrates a schematic overall configuration of a system including a vehicle according to an embodiment of the present disclosure. With reference to Fig. 1, vehicle 1 is, for example, a plug-in hybrid vehicle that is configured to be electrically connected to a charger 3 via a charging cable 2. Vehicle 1 may be any vehicle equipped with a secondary battery as a driving source, and may be a normal hybrid vehicle that cannot be plugged in for charging. Vehicle 1 may also be an electric vehicle or a fuel cell vehicle.

[0025] The vehicle 1 includes motor generators 11, 12, an engine 21, a power split device 22, driving wheels 23, a power control device (PCU: Power Control Unit) 30, a system main relay (SMR: System Main Relay) 41, a charging relay 42, a battery 50, a power conversion device 61, an inlet 62, an instrument panel 70, a car navigation system 80, a communication device 90, and an electronic control unit (ECU: Electronic Control Unit) 100.

[0026] Each of the motor generators 11, 12 is, for example, a three-phase AC rotating electric machine with a permanent magnet embedded in a rotor (not shown). The motor generator 11 is connected to a crankshaft of the engine 21 via a power split device 22. When starting the engine 21, the motor generator 11 rotates the crankshaft of the engine 21 using the power of the battery 50. The motor generator 11 can also generate power using the power of the engine 21. The AC power generated by the motor generator 11 is converted to DC power by the PCU 30 and charged into the battery 50. The AC power generated by the motor generator 11 may also be supplied to the motor generator 12.

[0027] The motor generator 12 rotates the drive shaft using at least one of the power from the battery 50 and the power generated by the motor generator 11. The motor generator 12 can also generate power by regenerative braking. The AC power generated by the motor generator 12 is converted to DC power by the PCU 30 and charged into the battery 50.

[0028] The engine 21 is an internal combustion engine such as a gasoline engine or a diesel engine, and generates power for running the vehicle 1 in response to a control signal from the ECU 100. The power split device 22 is, for example, a planetary gear mechanism, and splits the power generated by the engine 21 into power transmitted to the drive wheels 23 and power transmitted to the motor generator 11.

[0029] In response to a control signal from ECU 100, PCU 30 converts the DC power stored in battery 50 into AC power and supplies it to motor generators 11, 12. In addition, PCU 30 converts the AC power generated by motor generators 11, 12 into DC power and supplies it to battery 50.

[0030] The SMR 41 is electrically connected to a power line connecting the PCU 30 and the battery 50. The SMR 41 switches between supplying and cutting off power between the PCU 30 and the battery 50 in response to a control signal from the ECU 100.

[0031] The charging relay 42 is electrically connected to a power line connecting the battery 50 and the power conversion device 61. The charging relay 42 switches between supplying and cutting off power between the battery 50 and the power conversion device 61 in response to a control signal from the ECU 100.

[0032] The battery 50 is a DC power supply configured to be capable of being charged and discharged. A secondary battery such as a lithium ion secondary battery or a nickel metal hydride battery can be used as the battery 50. The battery 50 supplies the PCU 30 with electric power for generating a driving force for the vehicle 1. The battery 50 also stores the electric power generated by the motor generator 11.

[0033] The battery 50 includes a monitoring unit 51 that monitors the state of the battery 50. The monitoring unit 51 includes a voltage sensor that detects the voltage VB of the battery 50, a current sensor that detects the current IB input to and output from the battery 50, and a temperature sensor that detects the temperature TB of the battery 50 (none of which are shown). Each sensor outputs a signal indicating the detection result to the ECU 100. The ECU 100 can calculate the SOC of the battery 50 and the full charge capacity of the battery 50 based on the detection results of the voltage sensor and the current sensor.

[0034] The power conversion device 61 includes, for example, an AC / DC converter (not shown). The power conversion device 61 converts AC power supplied from the charger 3 via the charging cable 2 and the inlet 62 into DC power and outputs the DC power to the charging relay 42.

[0035] The instrument panel 70 is an instrument panel on which meters are installed, and displays various states of the vehicle 1 under the control of the ECU 100. More specifically, the instrument panel 70 displays a speedometer, a tachometer, a fuel gauge, a water temperature gauge, a trip meter, and warning lights, as well as the state of the battery 50 (SOC and full charge capacity).

[0036] The car navigation system 80 includes a GPS (Global Positioning System) receiver for identifying the position of the vehicle 1 based on radio waves from artificial satellites, and a monitor with a touch panel for accepting user operations and displaying various information (neither shown).

[0037] The communication device 90 is configured to be capable of two-way wired or wireless communication with the service tool 4. The communication device 90 is also configured to be capable of two-way communication with the smartphone 5 of the user.

[0038] The ECU 100 includes a CPU (Central Processing Unit), a memory, and an input / output port (none of which are shown). The ECU 100 may be divided into a plurality of ECUs for each function. The ECU 100 outputs control signals based on input of signals from each sensor and maps and programs stored in the memory, and controls each device so that the vehicle 1 is in a desired state. In this embodiment, a main control executed by the ECU 100 is a "battery display process" that calculates the SOC and full charge capacity of the battery 50 and displays indicators relating to each of the SOC and full charge capacity on the instrument panel 70 using icons. The battery display process will be described in detail later.

[0039] The service tool 4 is a dedicated terminal installed at a dealer or a repair shop, etc., and diagnoses the presence or absence of an abnormality in the vehicle 1 (including the state of the battery 50). More specifically, the service tool 4 includes a communication unit 401, a display unit 402, an operation unit 403, and a control unit 404. The control unit 404 diagnoses the presence or absence of an abnormality in the vehicle 1 by performing necessary communication with the vehicle 1 via the communication unit 401 in accordance with an operation on the operation unit 403 by a worker, and causes the display unit 402 to display the diagnosis result.

[0040] The smartphone 5 includes a communication module 501, a touch panel display 502, and a control unit 503. The control unit 503 can display various information related to the vehicle 1 on the touch panel display 502 and accept user operations on the touch panel display 502 by communicating with the vehicle 1 via the communication module 501.

[0041] The instrument panel 70 corresponds to the "display device" according to the present disclosure. The "display device" according to the present disclosure is not limited to the instrument panel 70, and may be the car navigation system 80, the service tool 4, or the smartphone 5. The ECU 100 of the vehicle 1, the control unit 404 of the service tool 4, and the control unit 503 of the smartphone 5 correspond to the "control device" according to the present disclosure.

[0042] <Battery display processing> When both the SOC and full charge capacity (capacity maintenance rate Q in the example described later) of the battery 50 are displayed on the instrument panel 70 in the battery display process, the user may confuse the two and may not be able to intuitively understand the displayed contents. Therefore, it is desirable to display the SOC and full charge capacity of the battery 50 in an easy-to-understand manner.

[0043] In this embodiment, the SOC of the battery 50 is represented by a segment display in a single icon displayed on the instrument panel 70, and the full charge capacity FCC of the battery 50 is represented by the display area of ​​the icon. Details of this representation mode will be described below with reference to the flowchart of Fig. 2. Note that, although this flowchart describes an example in which an icon representing the state of the battery 50 is displayed on the instrument panel 70, it is also possible to display the icon in a similar manner on other display devices (the car navigation system 80, the service tool 4, or the smartphone 5).

[0044] <Processing flow> 2 is a flowchart showing the battery display process in this embodiment. This flowchart is executed by the ECU 100 at each predetermined control cycle, for example. Each step included in this flowchart is basically realized by software processing by the ECU 100, but may also be realized by dedicated hardware (electrical circuitry) created within the ECU 100. In the following, steps are abbreviated as "S".

[0045] 2, in S1, the ECU 100 acquires the full charge capacity FCC of the battery 50. The ECU 100 can calculate the full charge capacity FCC of the battery 50 during, for example, plug-in charging of the vehicle 1, store the calculated full charge capacity FCC in a memory (not shown), and read out the value of the full charge capacity FCC.

[0046] A known method can be used to calculate the full charge capacity FCC. For example, the ECU 100 calculates the SOC of the battery 50 when plug-in charging starts. This SOC is referred to as the "start SOC" and is denoted as S1. The ECU 10 then calculates the amount of power ΔAh to be charged and discharged from the time when the start SOC is estimated. The amount of power ΔAh can be calculated by integrating the current value flowing through the battery 50 using a current sensor included in the monitoring unit 51. The ECU 100 then calculates the SOC of the battery 50 again. This SOC is referred to as the "end SOC" and is denoted as S2. Then, the ECU 100 can calculate the full charge capacity FCC of the battery 50 according to the following formula (1).

[0047] FCC=ΔAh / |S1-S2|×100 (1) In S2, the ECU 100 calculates the capacity maintenance rate Q of the battery 50. The capacity maintenance rate Q of the battery 50 is the ratio [unit: %] of the current full charge capacity FCC of the battery 50 to the full charge capacity FCC0 in the initial state of the battery 50, and is calculated by the following formula (2). Note that as the initial value FCC0 of the full charge capacity, a full charge capacity measured at the time of manufacturing the battery 50 (or the vehicle 1) may be used, or a specification value (catalog value) of the full charge capacity of the battery 50 may be used.

[0048] Q = FCC / FCC0 × 100 (2) However, the following process can be performed using the full charge capacity FCC without converting the full charge capacity FCC to the capacity maintenance rate Q. Also, instead of the full charge capacity FCC or the capacity maintenance rate Q of the battery 50, the EV distance maintenance rate of the vehicle 1 may be used. The EV distance maintenance rate is the ratio [unit: %] of the EV distance of the vehicle 1 at the current time to the EV distance of the vehicle 1 in the initial state. The EV distance is calculated as a value obtained by multiplying the full charge capacity of the battery 50 by the electric power consumption (power consumption per unit driving distance) of the vehicle 1. Since the EV distance is proportional to the full charge capacity, the EV distance maintenance rate indicates the same value as the capacity maintenance rate Q. Note that each of the full charge capacity FCC, the capacity maintenance rate Q, and the EV distance maintenance rate corresponds to the "second index" according to the present disclosure.

[0049] In S3, the icon size (icon display area) is determined according to the capacity maintenance rate Q calculated in S2.

[0050] Fig. 3 is a diagram for explaining a method for determining the icon size. With reference to Fig. 3, in this embodiment, the state of battery 50 is displayed by an icon that abstracts the case shape of a typical battery cell (such as a dry cell).

[0051] The size of the display area of ​​the icon represents the capacity maintenance rate Q of the battery 50. In the example shown in FIG. 3, the shape of the icon is the same regardless of the capacity maintenance rate Q of the battery 50, and the icons are congruent with each other. In other words, the display area of ​​the icon changes in the horizontal direction (X direction) and vertical direction (Y direction) while maintaining the aspect ratio of the icon. For comparison, the display size of the icon when the capacity maintenance rate Q of the battery 50 is 100% is shown by a dashed line in the figure.

[0052] The higher the capacity maintenance rate Q of the battery 50, the larger the display area of ​​the icon. When the capacity maintenance rate Q is 0%, the display area of ​​the icon becomes a predetermined minimum area Amin. When the capacity maintenance rate Q is 100%, the display area of ​​the icon becomes a predetermined maximum area Amax. When the capacity maintenance rate Q is greater than 0% and less than 100% (in this example, Q=40%), the display area of ​​the icon is determined to be proportional to the capacity maintenance rate Q between the minimum area Amin and the maximum area Amax.

[0053] Returning to Fig. 2, in S4, the ECU 100 acquires the current SOC of the battery 50. Then, the ECU 100 determines the number of segments to be displayed in the display area of ​​the icon according to the SOC acquired in S4 (S5).

[0054] Fig. 4 is a diagram for explaining a method for determining the number of segments in an icon. Referring to Fig. 4, the number of segments displayed in an icon represents the SOC of battery 50. In the example shown in Fig. 4, the number of segments in the icon increases or decreases in the vertical direction (Y direction) in accordance with changes in the SOC of battery 50.

[0055] The higher the SOC of the battery 50, the more the number of segments. When the SOC is 0%, the number of segments is a predetermined minimum number Nmin (0 in this example). When the SOC is 100%, the number of segments is a predetermined maximum number Nmax (9 in this example). When the SOC is greater than 0% and less than 100% (Q=40% in this example), the number of segments is determined to be proportional to the SOC between the minimum number Nmin and the maximum number Nmax.

[0056] Referring back to FIG. 2, in S6, ECU 100 causes instrument panel 70 to display an icon in accordance with the display area determined in S3 and the number of segments determined in S4.

[0057] 5 is a diagram showing an example of an icon displayed on the instrument panel 70. For example, when the SOC of the battery 50 is 100% and the capacity maintenance rate Q of the battery 50 is 100%, an icon as shown on the right side of the figure is displayed on the instrument panel 70. On the other hand, when the SOC of the battery 50 drops to 40% and the battery 50 deteriorates to the point where the capacity maintenance rate Q of the battery 50 drops to 10%, an icon as shown on the left side is displayed on the instrument panel 70.

[0058] As described above, in this embodiment, both the SOC and the capacity maintenance rate Q of the battery 50 are simultaneously displayed by a single icon. In the icon display mode in this embodiment, the SOC and the capacity maintenance rate Q of the battery 50 are represented by different icon features (number of segments / icon size). Therefore, compared to a case where the SOC and the capacity maintenance rate Q of the battery 50 are represented by a common feature, such as displaying both the SOC and the capacity maintenance rate Q of the battery 50 by segments (see, for example, Patent Document 1), it is easier to distinguish between the SOC and the capacity maintenance rate Q of the battery 50, and it is possible to prevent the user from confusing the two. Therefore, according to this embodiment, the SOC and full charge capacity of the battery 50 can be displayed in an easy-to-understand manner.

[0059] Generally, when a battery deteriorates and the capacity maintenance rate decreases, the amount of power that can be stored in the battery decreases. From this perspective, the capacity maintenance rate can be said to be an index that represents the size of the "container" that stores power. In this embodiment, the capacity maintenance rate Q of the battery 50 is expressed by the size of the display area of ​​the icon (icon size). Then, as the capacity maintenance rate Q of the battery 50 decreases, that is, as the size of the "container" becomes smaller, the icon size is made smaller. This allows the user to intuitively understand that the full charge capacity of the battery 50 is decreasing.

[0060] It is also conceivable to keep the icon size constant regardless of the capacity maintenance rate Q of the battery 50, and change the shading of the icon by an area corresponding to the amount of decrease as the capacity maintenance rate Q decreases (so-called graying out). However, some users may not immediately understand that the graying out means a decrease in the capacity maintenance rate Q, and may mistakenly believe that the grayed out area is due to a decrease in the SOC of the battery 50. Alternatively, the user may have to consciously confirm that the graying out means a decrease in the capacity maintenance rate Q and that a decrease in the number of segments means a decrease in the SOC (and not the other way around). According to this embodiment, by matching the change in the size of the "container" with the change in the icon size, the user can easily intuitively understand that the capacity maintenance rate Q of the battery 50 is decreasing.

[0061] However, the display method of the SOC of the battery 50 and the display method of the capacity maintenance rate Q of the battery 50 may be interchanged. That is, it is also possible to represent the capacity maintenance rate Q of the battery 50 by a segment display, and represent the SOC of the battery 50 by an icon size.

[0062] Also, as explained in Figures 3 and 4, while the number of segments in an icon increases or decreases in the vertical direction, the display area of ​​the icon changes in the horizontal direction (although it also changes in the vertical direction). That is, in this embodiment, the direction in which the number of segments of the icon increases or decreases and the direction in which the display area of ​​the icon changes are mutually perpendicular. If the direction in which the number of segments of the icon changes and the direction in which the display area of ​​the icon changes are the same (for example, if both are vertical), there is a risk that a decrease in the display area of ​​the icon will be mistaken for a decrease in the number of segments. By making the two directions perpendicular to each other, the possibility of such a misinterpretation can be reduced.

[0063] 4, the icon shape is enlarged / reduced while maintaining the aspect ratio of the icon, so that the user can easily recognize the icon. Therefore, the SOC and capacity maintenance rate Q of the battery 50 can be displayed in an easier-to-understand manner.

[0064] The segment display is an example of a "display by increasing or decreasing the scale" according to the present disclosure. The "scale display" is not limited to a segment display, and may include, for example, a meter display. In other words, the value indicated by an analog needle may indicate one of the SOC and the capacity maintenance rate Q of the battery 50.

[0065] 3, an example has been described in which an icon is enlarged / reduced in accordance with the capacity maintenance rate Q of battery 50 while maintaining the aspect ratio of the icon. However, it is not always necessary to maintain the aspect ratio of the icon when changing the icon size.

[0066] Fig. 6 is a diagram for explaining another display mode of the icon size. With reference to Fig. 6, in this example, the length in the horizontal direction (Y direction) perpendicular to the direction in which the number of segments changes (X direction) is changed, while the length in the vertical direction, which is the same direction as the direction in which the number of segments changes, is maintained. Even with such a display mode, it is possible to reduce the possibility of misreading.

[0067] When the full charge capacity of the battery 50 decreases, the number of segments of the icon decreases quickly even if the same amount of charge and discharge of power is performed as before the decrease in the full charge capacity of the battery 50. However, it is possible that the user does not notice the decrease in the full charge capacity and questions why the speed at which the number of segments of the icon decreases has increased. In the display mode shown in FIG. 6, the direction in which the number of segments increases and decreases is the vertical direction, while the direction in which the icon size changes is only the horizontal direction (the width direction of the icon). In other words, the direction in which the number of segments increases and decreases and the direction in which the icon size changes are completely distinguished. In this way, the user can more easily understand that the full charge capacity of the battery 50 has decreased because the width of the icon has narrowed, and can further understand that the direction in which the number of segments increases and decreases has become faster as the full charge capacity decreases. This reduces the possibility that the user will have such questions.

[0068] [Variation 1] In the embodiment, an example has been described in which an icon that abstracts the shape of a battery case is used, but the type of icon is not limited to this.

[0069] FIG. 7 is a diagram showing another example of an icon displayed on the instrument panel 70. Referring to FIG. 7, in the first modification, a bucket-shaped icon is used, and the amount of power stored in the battery 50 is likened to water. The SOC of the battery 50 is represented by the amount of water in the bucket, and the full charge capacity of the battery 50 is represented by the size of the bucket. The act of filling a bucket with water and pouring water from the bucket is a common occurrence in daily life, and the analogy is easy to understand even for users who are not familiar with batteries. The first modification can also display the SOC and full charge capacity of the battery 50 in an easy-to-understand manner, similar to the embodiment.

[0070] [Variation 2] In the present embodiment and the first modification, a configuration for displaying the SOC and full charge capacity of the battery 50 has been described. In the second modification, a configuration for displaying the degradation state (SOH: State Of Health) of the battery 50 in addition to the SOC and full charge capacity of the battery 50 will be described. In general, the internal resistance of the battery increases as the battery deteriorates. The SOH of the battery 50 in the second modification described below specifically refers to the internal resistance of the battery 50.

[0071] Fig. 8 is a diagram showing an example of an icon further displaying the SOH of battery 50. Referring to Fig. 8, in Modification 1, a heart-shaped icon is employed to represent the internal resistance R of battery 50. The lower the internal resistance R of battery 50, the larger the display area of ​​the heart-shaped icon. As deterioration of battery 50 progresses and the internal resistance R increases, the display area of ​​the heart-shaped icon becomes smaller.

[0072] In this manner, the SOH of the battery 50 may be further displayed in addition to the SOC and full charge capacity of the battery 50. The SOH of the battery 50 may affect the charge / discharge performance of the battery 50 (and thus the driving performance of the vehicle 1). The SOH of the battery 50 may also affect the selling price of the vehicle 1. Therefore, the SOH of the battery 50 is of concern to the user. Therefore, by displaying the SOH of the battery 50 in a manner that is easy for the user to understand, it is possible to improve user convenience.

[0073] The SOH of the battery 50 is not limited to the internal resistance R of the battery 50. The SOH of the battery 50 may be a parameter (i.e., the life of the battery 50) calculated based on both the full charge capacity FCC and the internal resistance R of the battery 50. For example, the SOH may be a parameter that scores the state of the battery 50, such that the full charge capacity FCC and the internal resistance R of the battery 50 are appropriately weighted and the full score (e.g., FCC 60 points + R 40 points = 100 points in total) is reached when both the full charge capacity FCC and the internal resistance R are at their highest values ​​(initial values ​​of the battery 50), and the zero score (FCC 0 points + R 0 points = 0 points in total) is reached when both the full charge capacity FCC and the internal resistance R are at their lowest values ​​(manufacturer's guaranteed values ​​of the battery 50 after deterioration).

[0074] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present disclosure is defined by the claims, not by the description of the embodiments described above, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0075] 1 vehicle, 2 charging cable, 3 charger, 4 service tool, 401 communication unit, 402 display unit, 403 operation unit, 404 control unit, 5 smartphone, 501 communication module, 502 touch panel display, 503 control unit, 11, 12 motor generator, 21 engine, 22 power split device, 23 drive wheel, 42 charging relay, 50 battery, 51 monitoring unit, 61 power conversion device, 62 inlet, 70 instrument panel, 80 car navigation system, 90 communication device, 100 ECU.

Claims

1. A display system mounted on a vehicle, comprising: a display device configured to display first and second icons each representing information related to a secondary battery serving as a drive source for the vehicle; the first icon indicates a decrease in a remaining battery charge of the secondary battery by a decrease in a scale within the first icon, and indicates a decrease in a full charge capacity of the secondary battery by a decrease in a display area of ​​the first icon, the second icon does not include a scale for indicating a decrease in a remaining battery charge of the secondary battery, while a decrease in a display area of ​​the second icon indicates an increase in an internal resistance of the secondary battery; A display system, wherein the display device displays the first icon and the second icon in the same display area.

2. The display system according to claim 1 , wherein the display device displays the first icon superimposed on the second icon.

3. The scale increases and decreases in a predetermined direction, 3. The display system according to claim 1, wherein the display area of ​​the first icon is changed by changing a shape of the first icon in a direction perpendicular to the predetermined direction.

4. The display system according to claim 3 , wherein the shape of the first icon is transformed in the orthogonal direction while maintaining an aspect ratio of the first icon.

5. 3. The display system according to claim 1, wherein the first icon further includes a first line representing a display area of ​​the first icon when the capacity maintenance rate of the secondary battery is 100%, and the first line does not change regardless of a decrease in the display area of ​​the first icon due to a decrease in the full charge capacity.

6. The display system according to claim 1 or 2, wherein the second icon further includes a second line that does not change despite a reduction in the display area of ​​the second icon accompanying a reduction in the internal resistance.

7. A display system according to claim 1; A vehicle comprising the secondary battery.

8. A method for displaying a status of a secondary battery as a driving source of a vehicle, comprising: acquiring a remaining battery charge of the secondary battery; acquiring a full charge capacity of the secondary battery; displaying the first and second icons in the same display area of ​​the display device; the first icon indicates a decrease in a remaining battery charge of the secondary battery by a decrease in a scale within the first icon, and indicates a decrease in a full charge capacity of the secondary battery by a decrease in a display area of ​​the first icon, A method for displaying the status of a secondary battery, wherein the second icon does not include a scale to indicate a decrease in the remaining battery capacity of the secondary battery, while a decrease in the display area of ​​the second icon indicates an increase in the internal resistance of the secondary battery.

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