JP2021040370A - Display device - Google Patents

Abstract

To provide a display device which displays a degree of deterioration of a secondary battery mounted in a vehicle in such a manner that a user can intuitively recognize whether or not the secondary battery is a recyclable state.SOLUTION: A display device which displays a degree of deterioration of a secondary battery mounted in a vehicle comprises a scale 61 to which a zero point is added for indicating an upper limit value of the degree of deterioration capable of using the secondary battery for a predetermined application (e.g., for fixation) and is configured to display the degree of deterioration of the secondary battery (e.g., a present value of full charge capacity of the secondary battery) using the scale 61.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to a display device, and more particularly to a display device capable of displaying information on a secondary battery mounted on a vehicle.

Electric vehicles, such as electric vehicles (EVs) or hybrid vehicles (HVs), include secondary batteries that store power for travel. Secondary batteries deteriorate over time. When the secondary battery deteriorates, the full charge capacity of the secondary battery decreases. When the full charge capacity of the secondary battery decreases, the cruising range of the electric vehicle (so-called EV cruising range) becomes shorter due to the electric power stored in the secondary battery. For example, as disclosed in Japanese Patent Application Laid-Open No. 2011-257213 (Patent Document 1), a technique for notifying a user of the degree of deterioration of a current secondary battery by displaying a full charge capacity on a display device mounted on a vehicle. It has been known. According to such a technology, when the degree of deterioration of the secondary battery mounted on the electric vehicle becomes large, the user can replace the secondary battery. The electric vehicle is a vehicle that can run using the electric power stored in the secondary battery. The fully charged capacity of the secondary battery corresponds to the amount of electricity stored in the secondary battery when fully charged.

Japanese Unexamined Patent Publication No. 2011-257213

It is conceivable that the secondary battery used in the electric vehicle is removed from the electric vehicle and reused (secondary use) for other purposes (for example, for stationary use). However, if the deterioration of the secondary battery progresses until the use of the secondary battery cannot be continued in the electric vehicle, the secondary battery removed from the electric vehicle may not operate normally for the above other purposes.

The display device described in Patent Document 1 displays the full charge capacity of the secondary battery. However, at least at present, a display device for displaying the full charge capacity of a secondary battery mounted on a vehicle has not become widespread, and the full charge capacity is a parameter unfamiliar to users. Therefore, it is difficult for the user to determine whether or not the current secondary battery mounted on the vehicle is in a reusable state based only on the value of the full charge capacity of the secondary battery.

The present disclosure has been made to solve the above problems, and the purpose of the present disclosure is to allow the user to intuitively recognize whether or not the secondary battery mounted on the vehicle is in a reusable state. It is to provide a display device which displays the degree of deterioration of a secondary battery.

The display device according to the present disclosure is a display device that displays the degree of deterioration of a secondary battery mounted on a vehicle (hereinafter, also referred to as a “target vehicle”), and is a deterioration that allows the secondary battery to be used for a predetermined purpose. It has a scale with a zero point indicating the upper limit of the degree (hereinafter, also referred to as “guaranteed threshold”), and is configured to display the degree of deterioration of the secondary battery using this scale.

The display device has a scale with a zero point (ie, a reference point) indicating a guarantee threshold for a given application. The zero point on the scale may be represented by a numerical value "0" or a predetermined mark. When the degree of deterioration of the secondary battery is smaller than the guaranteed threshold value, it means that the secondary battery mounted on the target vehicle is in a reusable state for the above-mentioned predetermined use. When the degree of deterioration of the secondary battery is larger than the guaranteed threshold value, it means that the secondary battery mounted on the target vehicle is not in a reusable state for the above-mentioned predetermined use. In the above display device, the degree of deterioration of the secondary battery is displayed by a scale with a zero point indicating the guarantee threshold value, so whether or not the secondary battery mounted on the target vehicle is in a reusable state is determined. The user will be able to recognize it intuitively. Therefore, the user can determine the replacement time of the secondary battery mounted on the target vehicle in consideration of the reuse of the secondary battery.

The guarantee threshold is, for example, an upper limit of the degree of deterioration in which the normal operation of the secondary battery is guaranteed for a predetermined period when the secondary battery is removed from the target vehicle and used for a predetermined purpose. A business operator who sells a used battery may be required by a purchaser to guarantee the normal operation of the used battery for a predetermined period (so-called manufacturer's warranty). The guarantee threshold value may be a boundary value of whether or not the manufacturer's warranty can be obtained for the secondary battery removed from the target vehicle. By indicating the boundary value of whether or not the zero point on the scale is covered by the manufacturer's warranty, it becomes easier for the user to determine whether or not the secondary battery in use is covered by the manufacturer's warranty.

The display device may have a memory for storing the guarantee threshold. The display device may be configured to associate the scale with the degree of deterioration of the secondary battery. The display device may be configured to associate a guarantee threshold with respect to the zero point of the scale.

The predetermined application may be an application in which the performance required for the secondary battery is lower than that when the secondary battery is used in the target vehicle. The predetermined use may be for stationary use (for example, for residential use). Further, the predetermined use may be mounted on a vehicle other than the above-mentioned target vehicle (for example, a used vehicle).

The degree of deterioration of the secondary battery displayed by the display device is a parameter that changes according to the progress of deterioration of the secondary battery. The degree of deterioration of the secondary battery may be the fully charged capacity of the secondary battery (that is, the amount of electricity stored when fully charged). The degree of deterioration of the secondary battery may be the capacity retention rate of the secondary battery or the EV cruising range of the target vehicle.

The target vehicle may be an electric vehicle configured to travel using the electric power stored in the secondary battery. Electric vehicles include EVs (electric vehicles), HVs (hybrid vehicles), PHVs (plug-in hybrid vehicles), and range extender EVs.

The display device may be mounted on the target vehicle, or may be mounted on a mobile device such as a smartphone, a wearable device, an electronic key, or a service tool (that is, an electronic device portable by the user).

According to the present disclosure, it is provided a display device for displaying the degree of deterioration of a secondary battery so that the user can intuitively recognize whether or not the secondary battery mounted on the vehicle is in a reusable state. Becomes possible.

It is a figure which shows an example of the structure of the vehicle which mounted the display device which concerns on embodiment of this disclosure. It is a figure which shows the screen which is displayed on the display part of the display device which concerns on embodiment of this disclosure. It is a figure for demonstrating the detail of the display area shown in FIG. It is a flowchart which shows the processing procedure of the display control executed by the display device which concerns on embodiment of this disclosure. It is a figure which shows the modification of the display area shown in FIG. In the modified example shown in FIG. 5, it is a figure which shows the display mode when the degree of deterioration of a secondary battery becomes larger than a zero point.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the figure, the same or corresponding parts are designated by the same reference numerals, and the description thereof will not be repeated.

Hereinafter, a case where the display device according to the embodiment of the present disclosure is mounted on a vehicle will be described as an example. FIG. 1 is a diagram showing an example of a configuration of a vehicle 1 equipped with a display device according to the present embodiment.

With reference to FIG. 1, vehicle 1 is, for example, an electric vehicle. The vehicle 1 includes a motor generator (MG) 10, a power transmission gear 20, a drive wheel 30, a power control unit (PCU) 40, and a system main relay (SMR) 50. A built-in battery 100, a monitoring unit 200, an electronic control unit (ECU) 300, a display device 400, and an input device 500 are provided. The vehicle 1 is configured to travel using the electric power stored in the assembled battery 100.

The MG 10 is, for example, a three-phase AC rotary electric machine, and has a function as an electric motor (motor) and a function as a generator (generator). The output torque of the MG 10 is transmitted to the drive wheels 30 via a power transmission gear 20 including a speed reducer, a differential device, and the like.

When the vehicle 1 is braked, the MG 10 is driven by the drive wheels 30, and the MG 10 operates as a generator. The MG 10 can function as a braking device that performs regenerative braking that converts the kinetic energy of the vehicle 1 into electric power. The regenerative power generated by the regenerative braking force in the MG 10 is stored in the assembled battery 100.

The PCU 40 is a power conversion device that converts power in both directions between the MG 10 and the assembled battery 100. The PCU 40 includes, for example, an inverter and a converter that operate based on a control signal from the ECU 300. When the assembled battery 100 is discharged, the converter boosts the DC power supplied from the assembled battery 100 and supplies it to the inverter, and the inverter converts the DC power supplied from the converter into AC power to drive the MG 10. When charging the assembled battery 100, the inverter converts the AC power generated by the MG 10 into DC power and supplies it to the converter, and the converter steps down the DC power supplied from the inverter to a voltage suitable for charging the assembled battery 100. Is supplied to the assembled battery 100.

The PCU 40 suspends charging / discharging by stopping the operation of the inverter and the converter based on the control signal from the ECU 300. The PCU 40 may have a configuration in which the converter is omitted.

The SMR 50 is electrically connected to a power line connecting the assembled battery 100 and the PCU 40. When the SMR 50 is closed (that is, in a conductive state) in response to a control signal from the ECU 300, electric power can be exchanged between the assembled battery 100 and the PCU 40. On the other hand, when the SMR 50 is opened (that is, in the cutoff state) in response to the control signal from the ECU 300, the electrical connection between the assembled battery 100 and the PCU 40 is cut off.

The assembled battery 100 is a secondary battery that stores electric power for driving the MG 10 (that is, electric power for traveling). The assembled battery 100 according to this embodiment corresponds to an example of the "secondary battery" according to the present disclosure. The assembled battery 100 is a DC power source that can be recharged. For example, a plurality of parallel battery blocks formed by connecting a plurality of cells (battery elements) in parallel are connected in series. As the cell, for example, a lithium ion secondary battery can be adopted. However, the cell is not limited to the lithium ion secondary battery, and may be another secondary battery (for example, a nickel hydrogen secondary battery). Further, the cell may be an all-solid-state battery. The secondary battery is not limited to the assembled battery, and may be a single battery.

The monitoring unit 200 includes a voltage detection unit 210, a current detection unit 220, and a temperature detection unit 230. The voltage detection unit 210 detects the voltage VB between the terminals of the plurality of parallel battery blocks. The current detection unit 220 detects the current IB input / output to / from the assembled battery 100. The temperature detection unit 230 detects the temperature TB of each of the plurality of cells. Each detection unit outputs the detection result to the ECU 300.

The ECU 300 includes a CPU (Central Processing Unit) 301 and a memory 302. In this embodiment, the memory 302 includes a ROM (Read Only Memory), a RAM (Random Access Memory), and a rewritable non-volatile memory. The ECU 300 controls the in-vehicle device so that the vehicle 1 is in a desired state based on the signal received from the monitoring unit 200 and the information (for example, a map and a program) stored in the memory 302. Further, the ECU 300 constantly monitors the state of the assembled battery 100 and records the charge / discharge history (for example, voltage VB, current IB, and temperature TB) of the assembled battery 100 in the memory 302.

The display device 400 includes a control unit 410 and a display unit 420. The control unit 410 includes a CPU 411 and a memory 412. The control unit 410 is configured to be able to communicate with the ECU 300. The control unit 410 can acquire, for example, the state of the assembled battery 100 detected by the monitoring unit 200 from the ECU 300 in real time. Further, the control unit 410 can acquire the charge / discharge history of the assembled battery 100 from the ECU 300. The control program and the guarantee threshold value described later are stored in the memory 412 in advance. The display unit 420 displays information to the user (for example, the occupant of the vehicle 1).

The control unit 410 is configured to display the fully charged capacity of the assembled battery 100 (that is, the amount of electricity stored when fully charged) on the display unit 420. The control unit 410 is configured to update the content displayed on the display unit 420 by controlling the display unit 420. In the control unit 410, the CPU 411 executes the program stored in the memory 412 to execute the control of the display unit 420 (that is, the display control). However, the means for executing the display control is not limited to software, and it is also possible to execute the display control by dedicated hardware (electronic circuit). In this embodiment, the meter panel mounted on the vehicle 1 is adopted as the display unit 420 of the display device 400. However, the display unit 420 is not limited to the meter panel, and may be another display (for example, a head-up display or a display of a navigation system). The full charge capacity of the assembled battery 100 according to this embodiment corresponds to an example of the “degree of deterioration of the secondary battery” according to the present disclosure.

The input device 500 is a device that receives input from the user. The input device 500 is operated by the user and outputs a signal corresponding to the user's operation to the display device 400. The user can input a predetermined instruction or request to the display device 400 through the input device 500, or set the value of the parameter used in the display control to the display device 400. Examples of the input device 500 include various switches, various pointing devices, a keyboard, and a touch panel.

By the way, it is conceivable that the assembled battery 100 (that is, the used battery) used in the vehicle 1 is removed from the vehicle 1 and reused for other purposes. In this embodiment, it is assumed that the assembled battery 100 removed from the vehicle 1 is reused for stationary use. At this time, the user can determine the replacement time of the assembled battery 100 by referring to the state of the assembled battery 100 displayed on the display device 400.

In this embodiment, the display device 400 displays the full charge capacity of the assembled battery 100. However, full charge capacity is a parameter unfamiliar to users. Therefore, the display device 400 according to this embodiment has a scale with a zero point indicating a guarantee threshold value, and is configured to display the full charge capacity of the assembled battery 100 using this scale. In this embodiment, the guarantee threshold guarantees the normal operation of the assembled battery 100 for a predetermined period when the assembled battery 100 is removed from the vehicle 1 and used as a stationary (for example, residential) battery. It means the upper limit of the degree of deterioration.

By displaying the full charge capacity of the assembled battery 100 using the scale, the display device 400 intuitively recognizes whether or not the assembled battery 100 mounted on the vehicle 1 is in a reusable state. become able to. Therefore, the user can determine the replacement time of the assembled battery 100 mounted on the vehicle 1 in consideration of the reuse of the assembled battery 100. In this embodiment, the "stationary use" corresponds to an example of the "predetermined use" according to the present disclosure.

FIG. 2 is a diagram showing a screen displayed on the display unit 420 (that is, the meter panel) of the display device 400 according to this embodiment. With reference to FIG. 2, the screen D100 includes display areas M11 to M15 described below.

The display area M11 numerically displays the capacity retention rate of the assembled battery 100. The capacity retention rate of the assembled battery 100 is the current full charge capacity of the assembled battery 100 (hereinafter, "current capacity") with respect to the full charge capacity of the assembled battery 100 in the initial state (new) (hereinafter, also referred to as "initial capacity"). (Also referred to as) is expressed as a percentage. Each unit of the initial capacity and the current capacity is, for example, "Ah". However, "Wh" may be adopted instead of "Ah". The capacity retention rate corresponds to a parameter indicating the degree of deterioration of the assembled battery 100. As the deterioration of the assembled battery 100 progresses, the capacity retention rate of the assembled battery 100 decreases. The initial capacity is stored in advance in, for example, the memory 302. The control unit 410 obtains the current capacity of the assembled battery 100 based on the state of the assembled battery 100 detected by the monitoring unit 200, and determines the capacity retention rate of the assembled battery 100 based on the initial capacity of the assembled battery 100 and the current capacity. It is configured to calculate. The display area M11 displays the calculated capacity retention rate based on the instruction from the control unit 410. The monitoring unit 200 or the ECU 300 may have a function of calculating the capacity retention rate. Further, the display area M11 may display the current capacity numerically instead of the capacity retention rate.

The display area M12 includes a scale 61 and a needle 62. Each of the scale 61 and the needle 62 may be physically provided or may be virtually provided by an image. The display area M12 uses the scale 61 and the needle 62 to display the degree of deterioration of the assembled battery 100. The degree of deterioration of the assembled battery 100 is indicated by the needle 62. The indicated value of the needle 62 (that is, the degree of deterioration of the assembled battery 100 pointed to by the needle 62) is indicated by a numerical value attached to the scale 61. In this embodiment, the current capacity of the assembled battery 100 is used as an index of the degree of deterioration of the assembled battery 100. As the deterioration of the assembled battery 100 progresses, the current capacity of the assembled battery 100 becomes smaller, and as the current capacity of the assembled battery 100 becomes smaller, the needle 62 swings to the − side of the scale 61. Details of the display area M12 will be described later (see FIG. 3). The control unit 410 sequentially calculates the current capacity of the assembled battery 100 based on the state of the assembled battery 100 detected by the monitoring unit 200, and displays the obtained current capacity in the display area M12. The monitoring unit 200 or the ECU 300 may have a function of calculating the current capacity.

The display area M13 displays the SOC (State Of Charge) of the assembled battery 100 by a bar graph. The higher the SOC of the assembled battery 100, the longer the bar graph becomes and the closer to "F (Full)". The lower the SOC of the assembled battery 100, the shorter the bar graph and the closer to "E (Empty)". SOC represents the ratio of the amount of electricity stored to the fully charged capacity (more specifically, the current capacity) as a percentage. The SOC corresponds to a parameter indicating the remaining charge of the assembled battery 100. The SOC increases as the remaining charge of the assembled battery 100 increases. The control unit 410 sequentially calculates the SOC of the assembled battery 100 based on, for example, the state of the assembled battery 100 detected by the monitoring unit 200. As a method for calculating SOC, various known methods can be adopted. The display area M13 displays the calculated SOC based on the instruction from the control unit 410. The monitoring unit 200 or the ECU 300 may have a function of calculating SOC.

The display area M14 displays the traveling speed of the vehicle 1. The display area M15 displays the mileage of the vehicle 1. The control unit 410 is configured to sequentially acquire detected values of various sensors (for example, a vehicle speed sensor and an odometer (not shown)) from the ECU 300 and update the display contents of the display areas M14 and M15.

FIG. 3 is a diagram for explaining the details of the display area M12. With reference to FIG. 3, the scale 61 includes a zero point (ie, a reference point). A numerical value "0" is attached to the zero point. The scale 61 is provided with a numerical value and a reference numeral indicating the degree of deviation from the zero point and the direction of deviation so that the user can easily recognize the degree of deviation from the zero point. In this embodiment, the movable limit value on the − side of the needle 62 is “-3”, and the movable limit value on the + side of the needle 62 is “+7”. In this embodiment, the scale 61 divides the range of motion of the needle 62 into 10 regions at equal intervals. The indicated value of the needle 62 is variable in the range of "-3" to "+7". The region on the + side of the zero point of the scale 61 corresponds to the region where the degree of deterioration of the assembled battery 100 is smaller than the zero point. In the region on the + side of the scale 61 (that is, the region of more than 0 and +7 or less), the larger the attached numerical value (absolute value), the smaller the degree of deterioration of the assembled battery 100. The region on the-side of the zero point of the scale 61 corresponds to the region where the degree of deterioration of the assembled battery 100 is larger than the zero point. In the region on the − side of the scale 61 (that is, the region of -3 or more and less than 0), the larger the attached numerical value (absolute value), the greater the degree of deterioration of the assembled battery 100. The control unit 410 is configured to continuously move the needle 62 according to the degree of deterioration of the assembled battery 100 (current capacity in this embodiment).

The control unit 410 acquires the initial capacity of the assembled battery 100 from the ECU 300, and also acquires the guaranteed threshold value (that is, the upper limit of the degree of deterioration of the assembled battery 100 that can be used as a stationary battery) from the memory 412, and these initial values. Based on the capacity and the guaranteed threshold value, the scale 61 is associated with the degree of deterioration of the assembled battery 100 (hereinafter, also referred to as “scale setting”). In this embodiment, the control unit 410 associates the initial capacitance with the movable limit value (that is, "+7") on the + side of the needle 62. Further, the control unit 410 associates the guarantee threshold value with the zero point. By determining the degree of deterioration of two points on the scale 61, the degree of deterioration per scale (and by extension, the degree of deterioration at each position of the scale 61) is uniquely determined.

The control unit 410 sets the scale and acquires the degree of deterioration (current capacity in this embodiment) of the assembled battery 100. Then, the control unit 410 moves the needle 62 so that the needle 62 points to the position of the scale 61 corresponding to the degree of deterioration of the acquired assembled battery 100. In the example of FIG. 3, the needle 62 points to the zero point. This means that the degree of deterioration of the assembled battery 100 matches the upper limit of the degree of deterioration that allows the assembled battery 100 to be used as a stationary battery. That is, if the assembled battery 100 is further deteriorated, the assembled battery 100 cannot be reused as a stationary battery. As the deterioration of the assembled battery 100 progresses, the needle 62 swings toward the − side of the scale 61 (that is, the direction indicated by the arrow D11 in FIG. 3). On the other hand, when the deterioration of the assembled battery 100 is recovered, the needle 62 swings toward the + side of the scale 61 (that is, the direction indicated by the arrow D12 in FIG. 3).

FIG. 4 is a flowchart showing a display control processing procedure executed by the control unit 410 of the display device 400.

With reference to FIG. 4 together with FIGS. 1 and 2, in step 100 (hereinafter, also simply referred to as “S”) 100, the control unit 410 of the display device 400 determines whether or not a predetermined display update condition is satisfied. To do. The display update condition is a condition that defines the timing at which the control unit 410 updates the contents displayed in the display areas M11 and M12. When the display update condition is satisfied (YES in S100), the contents displayed in the display areas M11 and M12 are updated by the processing of S102, S104, S106, S108, and S110 described later. If the display update condition is not satisfied (NO in S100), the process of S100 is repeatedly executed, and the contents displayed in the display areas M11 and M12 are not updated.

The display update condition can be arbitrarily set, but in this embodiment, the display update condition is satisfied every time a predetermined period elapses. That is, the display update condition is satisfied when a predetermined period elapses from the previous update. The predetermined period may be one minute, one day, or one trip. The elapsed time may be measured by a timer (not shown) built in the control unit 410. When the power of the control unit 410 is turned off, the display update condition may be satisfied when the power of the control unit 410 is turned on.

In S102, the control unit 410 acquires the charge / discharge history of the assembled battery 100 used for calculating the current capacity of the assembled battery 100. The control unit 410 can acquire the charge / discharge history of the assembled battery 100 from the ECU 300.

In S104, the control unit 410 estimates the current value (that is, the current capacity) of the fully charged capacity of the assembled battery 100. The method for estimating the current capacity of the assembled battery 100 is arbitrary. For example, the control unit 410 can use the charge / discharge history acquired in S102 to obtain the electric energy ΔAh charged / discharged in the assembled battery 100 while the SOC of the assembled battery 100 changes from SOC1 to SOC2. The control unit 410 may calculate the electric energy ΔAh by integrating the current. The control unit 410 may estimate the current capacity C1 of the assembled battery 100 by the equation (1) shown below.

C1 = 100 × ΔAh / (SOC1-SOC2) ... (1)
The current capacity of the assembled battery 100 may be estimated by the ECU 300. The control unit 410 of the display device 400 may acquire the current capacity of the assembled battery 100 estimated by the ECU 300 from the ECU 300. The ECU 300 may be configured to create a frequency distribution indicating the frequency for each used area divided by the temperature of the assembled battery 100 and the SOC of the assembled battery 100. The ECU 300 may determine the degree of deterioration of the assembled battery 100 using such a frequency distribution, and estimate the current capacity of the assembled battery 100 based on the obtained degree of deterioration.

In S106, the control unit 410 acquires the initial value (that is, the initial capacity) of the fully charged capacity of the assembled battery 100 from the ECU 300. In S108, the control unit 410 sets the scale described above (that is, associates the scale 61 with the degree of deterioration of the assembled battery 100). A guarantee threshold is associated with the zero point on the scale 61. The guaranteed threshold is stored in memory 412.

In S110, the control unit 410 updates the contents displayed in the display areas M11 and M12 (FIG. 2) by executing the control (that is, display control) of the display unit 420. The details of S110 will be described below.

The control unit 410 calculates the capacity retention rate Q of the assembled battery 100 using the current capacity C1 and the initial capacity C0 acquired in S104 and S106, and displays the calculated capacity retention rate Q in the display area M11. The control unit 410 can calculate the capacity retention rate Q of the assembled battery 100 by the formula (2) shown below.

Q = 100 × C1 / C0 ... (2)
The control unit 410 uses the scale 61 on which the scale setting (S108) is set to display the current capacity C1 (that is, the degree of deterioration of the assembled battery 100) acquired in S104 in the display area M12. When the current capacity C1 of the assembled battery 100 matches the guaranteed threshold value, the needle 62 points to the zero point of the scale 61. When the current capacity C1 of the assembled battery 100 is larger than the guaranteed threshold value, the needle 62 points to the region + side of the zero point of the scale 61. In this case, the assembled battery 100 is in a state where it can be reused as a stationary battery. When the current capacity C1 of the assembled battery 100 is smaller than the guaranteed threshold value, the needle 62 points to the region on the − side of the zero point of the scale 61. In this case, the assembled battery 100 is in a state where it cannot be reused as a stationary battery.

In the display device 400 described above, the degree of deterioration of the assembled battery 100 is displayed by the scale 61 having a zero point indicating the guarantee threshold value. As a result, the user can intuitively recognize whether or not the assembled battery 100 mounted on the vehicle 1 is in a reusable state. The user can determine the replacement time of the assembled battery 100 mounted on the vehicle 1 in consideration of the reuse of the assembled battery 100.

In the above embodiment, the control unit 410 continuously moves the needle 62 according to the change in the degree of deterioration of the assembled battery 100. However, the present invention is not limited to this, and the control unit 410 may rotate the needle 62 by an angle corresponding to one scale each time the degree of deterioration of the assembled battery 100 changes by a unit amount (that is, the degree of deterioration per scale). ..

In the above embodiment, in the scale setting, the initial capacitance is associated with the movable limit value on the + side of the needle 62. However, the present invention is not limited to this, and a capacity smaller than the initial capacity (for example, the capacity when the capacity retention rate is 80%) may be associated with the movable limit value on the + side of the needle 62.

The zero point on the scale 61 may be represented by a predetermined mark instead of the numerical value "0". Moreover, the position of the zero point can be changed as appropriate. The movable range of the needle 62 may be set to "-5 to +5" instead of "-3 to +7". In the above embodiment, the number of divisions of the scale 61 is set to 10, but the number of divisions of the scale 61 is arbitrary. The number of divisions of the scale 61 may be 5 or more and less than 10, 11 or more, or 30 or more. The number of regions divided by the scale 61 may be only two, a region in which the degree of deterioration of the assembled battery 100 is less than the zero point and a region in which the degree of deterioration of the assembled battery 100 is greater than the zero point.

In the above embodiment, the display area M12 of the display device 400 is configured to display the degree of deterioration of the assembled battery 100 by using the scale 61 and the needle 62 (pointer) (see FIGS. 2 and 3). However, the present invention is not limited to this, and the display area M12A shown in FIG. 5 may be adopted instead of the display area M12. FIG. 5 is a diagram showing a modified example of the display area M12 shown in FIG.

With reference to FIG. 5, the display area M12A includes ten segments 70-79 constituting the scale and a mark M indicating the position of the zero point. Each of the segments 70 to 79 and the mark M may be physically provided or virtually provided by an image. The display area M12A is configured to display the degree of deterioration (for example, the current capacity) of the assembled battery 100 by using the segments 70 to 79 and the mark M. The lighting / extinguishing of each of the segments 70 to 79 is controlled by the control unit 410. The segments 70 to 79 are turned off in order from the + side (segment 79 side) as the deterioration of the assembled battery 100 progresses. For example, when the degree of deterioration of the assembled battery 100 increases by a unit amount (that is, the degree of deterioration per scale) from the state where all the segments 70 to 79 are lit, only the segment 79 of the segments 70 to 79 is turned off. It will be in the state of. When the degree of deterioration of the assembled battery 100 further increases by a unit amount after this state is reached, the segment 78 is further turned off as shown in FIG. Then, when the degree of deterioration of the assembled battery 100 reaches the guaranteed threshold value (that is, the upper limit of the degree of deterioration that allows the assembled battery 100 to be used as a stationary battery), the segment up to the position indicated by the mark M in FIG. (That is, segments 75 to 79) are turned off.

FIG. 6 is a diagram showing an example of a display mode of the display area M12A when the degree of deterioration of the assembled battery 100 becomes larger than the zero point. With reference to FIG. 6, in this example, when the degree of deterioration of the assembled battery 100 becomes larger than the zero point (that is, the guarantee threshold value), the control unit 410 changes the lighting state of each segment. For example, the control unit 410 changes the color of the light emitted from each segment, or changes the lighting state of each segment from lighting to blinking. This makes it easier for the user to recognize that the degree of deterioration of the assembled battery 100 is larger than the guaranteed threshold value. In the example of FIG. 6, only the segments 70 to 72 of the segments 70 to 79 are lit. Therefore, the degree of deterioration of the assembled battery 100 is larger than the zero point represented by the mark M. Each of the segments 70 to 72 shown in FIG. 6 is lit or blinking in a manner different from that shown in FIG.

In the display area M12A, the number of segments is not limited to 10, but is arbitrary as long as it is 2 or more. The number of segments may be 5 or more and less than 10, 11 or more, or 30 or more. Further, the shape of the mark M is not limited to a triangle and can be changed as appropriate.

In the above-described embodiment and modification, the current capacity is adopted as the degree of deterioration of the assembled battery 100 displayed in the display area M12 or M12A of the display device 400. However, the present invention is not limited to this, and instead of the current capacity of the assembled battery 100, the capacity retention rate of the assembled battery 100 or the EV cruising range of the vehicle 1 may be displayed in the display areas M12 and M12A. The EV cruising range of the vehicle 1 can be calculated, for example, by multiplying the average electricity cost (km / kWh) of the vehicle 1 by the current capacity (kWh).

In the above-described embodiment and modification, stationary use is adopted as a predetermined use. However, the predetermined use is not limited to the stationary use and can be changed as appropriate. For example, the guarantee threshold value stored in the memory 412 may be an upper limit value of the degree of deterioration of the assembled battery 100 that can use the assembled battery 100 as a battery for a used car.

The target vehicle is not limited to EV (electric vehicle). For example, the target vehicle may be an HV (hybrid vehicle), a PHV (plug-in hybrid vehicle), or a range extender EV. The ECU 300 (vehicle control device) may have a part or all of the functions of the control unit 410 of the display device 400. The ECU 300 may function as a control unit of the display device 400.

In the above-described embodiment and modification, the display device 400 and the input device 500 are mounted on the vehicle 1. However, the present invention is not limited to this, and the display device 400 and the input device 500 may be mounted on a portable device (for example, a smartphone, a wearable device, an electronic key, or a service tool) configured to be able to communicate with the ECU 300 (vehicle control device). Good. The portable device including the display device 400 may display the degree of deterioration of the assembled battery 100 on the display unit 420 of the display device 400 based on the information of the assembled battery 100 (vehicle-mounted battery) acquired from the ECU 300. The screen D100 shown in FIG. 2 includes display areas M11 to M15. However, the present invention is not limited to this, and only the display area M12 may be displayed on the display unit 420 of the display device 400.

The embodiments disclosed this time should be considered to be exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the description of the embodiment described above, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

1 vehicle, 10 MG, 20 power transmission gear, 30 drive wheels, 40 PCU, 50 SMR, 61 scale, 62 needles, 70-79 segments, 100 sets of batteries, 200 monitoring unit, 210 voltage detector, 220 current detector, 230 temperature detector, 300 ECU, 301 CPU, 302 memory, 400 display device, 410 control unit, 411 CPU, 412 memory, 420 display unit, 500 input device, M mark, M11 to M15, M12A display area.

Claims (1)

It is a display device that displays the degree of deterioration of the secondary battery mounted on the vehicle.
It has a scale with a zero point indicating an upper limit of the degree of deterioration in which the secondary battery can be used in a predetermined application, and is configured to display the degree of deterioration of the secondary battery using the scale. , Display device.

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