JP2021040366A - Display device - Google Patents

Abstract

To display information relating to whether or not a degree of deterioration of a secondary battery is covered by a guarantee.SOLUTION: A control device executes processing including: a step (S102) of acquiring a charge/discharge history in the case where a display update condition is satisfied (YES in S100); a step (S104) of estimating a degree of deterioration of a battery pack; a step (S106) of acquiring a vehicle application flag; a step (S110) of setting a guarantee threshold to 60% when the vehicle application flag is in an ON state (YES in S108); a step (S112) of setting the guarantee threshold to 30% when the vehicle application flag is in an OFF state (NO in S108); and a step (S114) of executing display control.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a display device that displays the degree of deterioration of a secondary battery.

An electric vehicle in which a vehicle is driven by a drive electric motor such as an electric vehicle or a hybrid vehicle is equipped with a secondary battery used as a power source for supplying electric power to the drive electric motor. Further, when this secondary battery cannot be used as a power source for an electric vehicle due to deterioration, it may be sold and used as a stationary storage battery for a house, for example.

For users who purchased a vehicle equipped with such a secondary battery or a user who purchased a secondary battery installed in an electric vehicle for the purpose of a stationary storage battery, for example, the full charge capacity is within the warranty period. A warranty may be set to replace the battery if it is significantly reduced (ie, if the degree of deterioration increases rapidly).

Therefore, in order for the user to accurately grasp the degree of deterioration of the secondary battery, it is required that the full charge capacity and the degree of deterioration of the secondary battery be displayed on a display device that can be recognized by the user.

For example, Japanese Patent Application Laid-Open No. 2011-257213 (Patent Document 1) discloses a technique for displaying the remaining capacity and the fully charged capacity of a secondary battery.

Japanese Unexamined Patent Publication No. 2011-257213

However, it is not possible to judge by simply displaying the full charge capacity and deterioration degree of the secondary battery to the user as to what state the full charge capacity and deterioration degree of the secondary battery should be covered by the warranty. Because it is not possible, it is required to provide the user with information about whether it is covered by the warranty.

The present disclosure has been made to solve the above-mentioned problems, and an object thereof is to provide a display device capable of displaying information as to whether or not it is covered by a guarantee regarding the degree of deterioration of a secondary battery. That is.

The display device according to a certain aspect of the present disclosure is a display device that displays the degree of deterioration of a secondary battery used as a power supply source of a drive electric motor for driving an electric vehicle by using a scale. The display device is configured to display together with the degree of deterioration of the secondary battery by changing the upper limit of the degree of deterioration in which the secondary battery can be used depending on the use of the secondary battery.

In this way, the upper limit of the degree of deterioration in which the secondary battery can be used is changed depending on the application of the secondary battery, and in addition to the degree of deterioration in the secondary battery, the degree of deterioration in which the secondary battery can be used is changed. Since the upper limit value of is displayed, the user can visually recognize whether the deterioration degree of the secondary battery exceeds the upper limit value, that is, whether the deterioration degree has increased enough to be replaced. Can be done.

According to the present disclosure, it is possible to provide a display device capable of displaying information as to whether or not the degree of deterioration of the secondary battery is covered by the guarantee.

It is a figure which shows an example of the structure of the vehicle including the display device which concerns on this embodiment. It is a flowchart which shows an example of the process executed by the control device which controls the display device which concerns on this Embodiment. It is a figure which shows the display example using a display device. It is a figure which shows the other display example using a display device. It is a figure for demonstrating the structure of the electric device connected to the assembled battery when it is used as a stationary storage battery.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The same or corresponding parts in the drawings 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 including a display device according to the present embodiment.

In this embodiment, the vehicle 1 is, for example, an electric vehicle. The vehicle 1 includes a drive system 2, an assembled battery 100, a monitoring unit 200, a control device 300, and a display device 400.

The drive system 2 includes an electric load of the assembled battery 100. Specifically, the drive system 2 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). : System Main Relay) 50.

The MG10 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. As a result, the MG 10 also functions 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.

When the assembled battery 100 is discharged, the converter boosts the voltage supplied from the assembled battery 100 and supplies it to the inverter. The inverter converts the DC power supplied from the converter into AC power to drive the MG 10.

On the other hand, the inverter converts the AC power generated by the MG 10 into DC power and supplies it to the converter when the assembled battery 100 is charged. The converter lowers the voltage supplied from the inverter to a voltage suitable for charging the assembled battery 100 and supplies the voltage to the assembled battery 100.

Further, the PCU 40 suspends charging / discharging by stopping the operation of the inverter and the converter. 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), electric power can be exchanged between the assembled battery 100 and the PCU 40. On the other hand, when the SMR 50 is open (that is, in a cut-off state), the electrical connection between the assembled battery 100 and the PCU 40 is cut off.

The assembled battery 100 is a power storage device that stores electric power for driving the MG 10. The assembled battery 100 is a DC power source that can be recharged, and is configured by, for example, a plurality of cells (battery elements) connected in series. The cell includes, for example, a secondary battery such as a nickel metal hydride battery or a lithium ion secondary battery. The assembled battery 100 may be configured by connecting a plurality of parallel battery blocks formed by connecting a plurality of cells in parallel in series, for example. A memory 102 is provided in the assembled battery 100. In the memory 102, for example, information about the initial value of the full charge capacity of the assembled battery 100, a vehicle use flag, and the like are stored. For example, when the vehicle use flag is on, it indicates that the assembled battery 100 is used as a power source for the vehicle 1. When the vehicle use flag is off, it indicates that the assembled battery 100 is used for a purpose other than the vehicle use, for example, as a stationary storage battery. The vehicle use flag is set to the on state as an initial state, for example. The vehicle use flag may be set to an off state by using a predetermined device such as a PC (Personal Computer), for example, when the degree of deterioration of the assembled battery 100 progresses and the battery is sold as a stationary storage battery. The information stored in the memory 102 can be read by the control device 300.

The monitoring unit 200 is provided in the assembled battery 100. 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 assembled battery 100. 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 the assembled battery 100. Each detection unit outputs the detection result to the control device 300.

The control device 300 includes a CPU (Central Processing Unit) 301 and a memory 302. The above-mentioned memories 102 and 302 include, for example, a ROM (Read Only Memory) and a RAM (Random Access Memory). The control device 300 controls the display device 400 based on a signal received from the monitoring unit 200, information acquired from the memory 102, information such as a map and a program stored in the memory 302. The various controls performed by the control device 300 are not limited to processing by software, but can also be processed by dedicated hardware (electronic circuits).

The control device 300 stores the detected value from the monitoring unit 200 in the memory 302. The control device 300 has a function of sequentially calculating the SOC (State Of Charge) of the assembled battery 100 based on the values detected by the voltage detection unit 210, the current detection unit 220, and the temperature detection unit 230. SOC indicates the current amount of electricity stored in the assembled battery 100 as a percentage. As a method for calculating SOC, various known methods such as a method based on current value integration (Coulomb count) or a method based on estimation of open circuit voltage (OCV) can be adopted.

The display device 400 is composed of, for example, a liquid crystal display, an organic EL (Electro-Luminescence) display, or the like. The display device 400 displays predetermined information according to the control signal from the control device 300. In the present embodiment, the display device 400 includes, for example, a display device provided at a position visible to a seated driver in the room of the vehicle 1, a display device of a mobile terminal such as a smartphone carried by the user, and the vehicle 1. Includes at least one of a display device such as a PC owned by the user at home and a display device of a deterioration diagnostic device used in a dealer or the like outside the above. Further, the control device 300 may be realized as one function of an ECU (Electronic Control Unit) provided in the vehicle 1, for example, may be realized by a control device of a mobile terminal, or a PC owned by a user. It may be realized by the control device of the deterioration diagnosis machine. When the control device 300 is realized by a device other than the ECU provided in the vehicle 1, the information output from the monitoring unit 200 and the information stored in the memory 102 are the communication devices mounted on the vehicle 1 (not shown). It may be transmitted from to a mobile terminal, a PC or a deterioration diagnosis device via a predetermined communication network.

As described above, the vehicle 1 configured as described above is equipped with the assembled battery 100, which is a secondary battery used as a power source for supplying electric power to the MG 10 which is a drive electric motor, and the vehicle 1 is mounted on the assembled battery 100. It runs with the charge and discharge of. Therefore, the assembled battery 100 deteriorates with time. Further, when the assembled battery 100 cannot be used as a power source for the vehicle 1 due to the progress of deterioration, it may be sold and used as a stationary storage battery for a house, for example.

For users who purchased the vehicle 1 equipped with the assembled battery 100 as a new car or a used car, or for users who purchased the assembled battery 100 mounted on the vehicle 1 as a used battery for the purpose of a stationary storage battery. For example, if the full charge capacity drops significantly within a predetermined warranty period (that is, the degree of deterioration increases rapidly), a warranty may be set so that the battery can be replaced with another assembled battery.

Therefore, in order for the user to accurately grasp the degree of deterioration of the assembled battery 100, it is required that the fully charged capacity and the degree of deterioration of the assembled battery 100 are displayed on the display device 400 that can be recognized by the user.

However, it is not possible to judge the state in which the fully charged capacity and the degree of deterioration of the assembled battery 100 are covered by the warranty simply by displaying the fully charged capacity and the degree of deterioration of the assembled battery 100 to the user. Because it is not possible, it is required to provide the user with information about whether it is covered by the warranty.

Therefore, in the present embodiment, the display device 400 displays the degree of deterioration of the assembled battery 100 used as the power supply source of the MG 10 for driving the vehicle 1 by using a scale, and the assembled battery 100 can be used. The upper limit of the degree shall be changed according to the use of the assembled battery 100 and displayed together with the degree of deterioration of the assembled battery 100.

In this way, the upper limit of the degree of deterioration in which the assembled battery 100 can be used is changed depending on the application of the assembled battery 100, and in addition to the degree of deterioration in the assembled battery 100, the degree of deterioration in which the assembled battery 100 can be used is changed. Since the upper limit value of is displayed, the user can visually check whether the deterioration degree of the assembled battery 100 exceeds the usable upper limit value, that is, whether the deterioration degree has increased enough to be replaced. Can be recognized.

Hereinafter, an example of the control process executed by the control device 300 will be described with reference to FIG. FIG. 2 is a flowchart showing an example of processing executed by the control device 300 that controls the display device 400 according to the present embodiment.

In step 100 (hereinafter, step is referred to as S) 100, the control device 300 determines whether or not the display update condition is satisfied.

The control device 300 determines that the display update condition is satisfied when, for example, the condition that a certain time has elapsed from the time when the display control of the previous deterioration degree is executed is satisfied. For example, a timer (not shown) built in the control device 300 can measure the elapsed time from the time when the previous deterioration degree display control is executed. The fixed time can be set to, for example, about several minutes, about several hours, or about several days. When it is determined that the display update condition is satisfied (YES in S100), the process is transferred to S102. On the other hand, when it is determined that the display update condition is not satisfied (NO in S100), this process is terminated.

In S102, the control device 300 acquires the charge / discharge history. The control device 300 has, for example, a charge / discharge history (for example, a history of battery temperature TB, which is necessary for calculating the degree of deterioration in the period from the time when the display control of the degree of deterioration is executed last time to the time when a certain time has elapsed. The charge / discharge history is acquired by reading the SOC history, the current IB history, the voltage VB history, etc.) from the memory 302.

In S104, the control device 300 estimates the degree of deterioration of the assembled battery 100. In the present embodiment, as an example, the degree of deterioration of the secondary battery is quantitatively determined by using, for example, a "capacity retention rate" defined as a percentage of the current fully charged capacity to the fully charged capacity (Ah) when new. Evaluate to. From this definition, it is understood that the higher the capacity retention rate, the lower the degree of deterioration of the secondary battery, and the lower the capacity retention rate, the higher the degree of deterioration of the secondary battery.

The control device 300 uses, for example, the amount of change in SOC and the integrated value of charge / discharge current in the period from the execution of the previous display control of the degree of deterioration to the elapse of a certain time, to present the full charge capacity of the assembled battery 100. The value may be estimated, and the degree of deterioration may be estimated using the capacity retention rate calculated from the estimated current value of the fully charged capacity and the fully charged capacity when the product is new.

Alternatively, the control device 300 sets, for example, a plurality of use areas divided by the temperature of the assembled battery 100 and the SOC, and each use in a period from the execution of the previous deterioration degree display control until a certain time elapses. The frequency distribution used in the area is obtained, the deterioration progress in each area is calculated from the obtained frequency distribution, and the amount of decrease in the capacity retention rate calculated from the deterioration progress and the usage time in each area. May be used to estimate the degree of deterioration. As a method for estimating the degree of deterioration of the assembled battery 100, not only the above-mentioned method but also a known technique may be applied.

In S106, the control device 300 acquires the vehicle use flag. The control device 300 acquires the vehicle use flag by reading the vehicle use flag from the memory 102, for example.

In S108, the control device 300 determines whether or not the vehicle use flag is in the ON state. When it is determined that the vehicle use flag is in the ON state (YES in S108), the process is transferred to S110.

In S110, the control device 300 sets the guarantee threshold to 60%. The guarantee threshold value indicates an upper limit value of the degree of deterioration (full charge capacity retention rate) at which the assembled battery 100 can be used. That is, the control device 300 sets 60% as a guarantee threshold value corresponding to the vehicle application. When it is determined that the vehicle use flag is in the off state (NO in S108), the process is transferred to S112.

In S112, the control device 300 sets the guarantee threshold to 30%. That is, the control device 300 is set to 30% as a guarantee threshold value corresponding to applications other than vehicle applications (applications for stationary storage batteries).

At S114, the control device 300 executes display control. Specifically, the control device 300 displays the current value of the full charge capacity maintenance rate indicated as the degree of deterioration and the guarantee threshold value.

FIG. 3 is a diagram showing a display example using the display device 400. As shown in FIG. 3, the display device 400 displays the full charge capacity retention rate of the assembled battery 100, which is represented by a numerical value from 0% to 100%, using a predetermined number (for example, 10) of scales.

That is, in the display device 400, 10 rectangular frames are stacked and displayed as scales in the vertical direction of FIG. A straight line portion extending from the left end of the lower side of the rectangular frame corresponding to 0% to 10% of the displayed predetermined number of rectangular frames (scales) is displayed, and "0%" is displayed on the left end side of the straight line portion. Character information indicating "" is displayed. The state in which the full charge capacity retention rate is 0% indicates the state in which the degree of deterioration is the highest.

Further, a straight line portion is displayed on the left end side of the upper side of the rectangular frame corresponding to 90% to 100% of the displayed predetermined number of rectangular frames, and a character indicating "100%" is displayed on the left end side of the straight line portion. Information is displayed. A state in which the full charge capacity retention rate is 100% indicates a state in which the degree of deterioration is the lowest.

Further, a straight line portion extending from the left end of the upper side of the rectangular frame corresponding to 50% to 60% of the displayed predetermined number of rectangular frames to the left is displayed, and the "guarantee threshold" is displayed above the display of the straight line portion. Character information indicating "value" is displayed. Further, character information indicating "60%" is displayed on the left end side of the straight line portion. The rectangular frame corresponding to 0% to 60%, which indicates the guarantee threshold value, is given a color scheme different from other rectangular frames (diagonal areas with narrow intervals in FIG. 3).

Further, an arrow arranged toward the right end of the upper side is displayed on the right end side of the upper side of the rectangular frame corresponding to 70% to 80% of the displayed predetermined number of rectangular frames, and the right end side of the arrow is displayed. Character information indicating "80% (current value)" is displayed in. The rectangular frame corresponding to the guarantee threshold value of 60% to the current value of the capacity retention rate of 80% is given a color scheme different from that of other rectangular frames (divided area with a wide interval in FIG. 3).

FIG. 4 is a diagram showing another display example using the display device 400. FIG. 4 differs from FIG. 3 in that the guarantee threshold value is set to 30%. Therefore, since the display mode of FIG. 4 is the same as the display mode of FIG. 3 except for the case described below, the detailed description thereof will not be repeated.

In FIG. 4, a straight line portion extending from the left end of the upper side of the rectangular frame corresponding to 20% to 30% of the displayed predetermined number of scales to the left is displayed, and "guarantee" is displayed above the display of the straight line portion. Character information indicating "threshold value" is displayed. Further, character information indicating "30%" is displayed on the left end side of the straight line portion. The rectangular frame corresponding to 0% to 30%, which indicates the guarantee threshold value, is given a color scheme different from that of other rectangular frames (diagonal areas with narrow intervals in FIG. 4).

Further, an arrow arranged toward the right end of the upper side is displayed on the right end side of the upper side of the rectangular frame corresponding to 40% to 50% of the displayed predetermined number of rectangular frames, and the right end side of the arrow is displayed. Character information indicating "50% (current value)" is displayed in. The rectangular frame corresponding to the guarantee threshold value of 30% to the current value of the current value of the capacity retention rate of 50% is given a color scheme different from other rectangular frames (diagonal area with a wide interval in FIG. 4). Will be done.

The operation of the control device 300 of the display device 400 according to the present embodiment based on the above structure and flowchart will be described.

For example, when a certain time has elapsed from the time when the display control of the degree of deterioration was executed last time, it is determined that the display update condition is satisfied (YES in S100), and the charge / discharge history is acquired (S102). ). The degree of deterioration of the assembled battery 100 is estimated using the acquired charge / discharge history (S104), and the vehicle use flag is acquired from the memory 102 of the assembled battery 100 (S106).

When the vehicle use flag is on (YES in S108), the guarantee threshold value is set to 60% (S110), and display control is executed (S114). By executing the display control, the display device 400 displays the current value of the full charge capacity maintenance rate and the guaranteed threshold value as shown in FIG.

In some cases, the assembled battery 100 is deteriorated and cannot be used as a power source for the vehicle 1. In such a case, the assembled battery 100 may be distributed to a distributor and sold as a stationary storage battery (used battery). At this time, the vehicle use flag stored in the memory 102 is set to the off state and the vehicle is sold. It is assumed that the user who purchased the assembled battery 100 uses it as a stationary storage battery.

FIG. 5 is a diagram for explaining the configuration of an electric device connected to the assembled battery 100 when used as a stationary storage battery. As shown in FIG. 5, when the assembled battery 100 is installed as a stationary storage battery in the house 3, the assembled battery 100 is connected to the electric load 4 in the house 3.

The electric load 4 includes a power conversion device that converts DC power into AC power, and an electric device 6 such as a home appliance that operates by AC power.

In such a case, if it is determined that the display update condition is satisfied when a certain time has elapsed from the time when the display control of the degree of deterioration was executed last time (YES in S100), the charge / discharge history Is acquired (S102). The degree of deterioration of the assembled battery 100 is estimated using the acquired charge / discharge history (S104), and the vehicle use flag is acquired from the memory 102 of the assembled battery 100 (S106).

When the vehicle use flag is in the off state (NO in S108), the guarantee threshold value is set to 30% (S112), and display control is executed (S114). By executing the display control, the display device 400 displays the current value of the full charge capacity maintenance rate and the guaranteed threshold value as shown in FIG.

As described above, according to the display device 400 according to the present embodiment, the guaranteed threshold value of the full charge capacity retention rate of the assembled battery 100 is changed depending on the application of the assembled battery 100, and the full charge capacity retention rate is changed. Since the guaranteed threshold value is displayed in addition to the current value, whether or not the user has a full charge capacity retention rate of the assembled battery 100 below the guaranteed threshold value, that is, the degree of deterioration increases as it is subject to replacement. It is possible to visually recognize whether or not it is done. Therefore, it is possible to provide a display device capable of displaying information as to whether or not the degree of deterioration of the secondary battery is covered by the guarantee.

Hereinafter, modification examples will be described.

In the above embodiment, the guarantee threshold is set to 60% when the vehicle use flag is on, and the guarantee threshold is set to 30% when the vehicle use flag is off. Although described as, the guaranteed thresholds of 30% and 60% are examples and are not particularly limited to these values.

Further, in the above-described embodiment, it has been described that whether the assembled battery 100 is used for a vehicle application or a non-vehicle application is determined by using a vehicle application flag, but there are a plurality of types of applications. Different guarantee thresholds may be set for various uses.

Further, in the above-described embodiment, the display device 400 has been described as displaying the full charge capacity retention rate of the assembled battery 100, but in addition to displaying the full charge capacity retention rate of the assembled battery 100, the assembled battery 100 Other information such as SOC information of the assembled battery 100 and temperature information of the assembled battery 100 may be displayed.

Further, in the above-described embodiment, the warranty threshold value is changed and displayed depending on the application when the display update condition is satisfied. However, for example, when the warranty period has elapsed, the warranty threshold value is displayed. You may stop the display of, or you may display that the warranty period has expired.

Further, in the above-described embodiment, the unit of the fully charged capacity of the assembled battery 100 is set to "Ah", and the capacity retention rate (current capacity retention rate) thereof has been described as indicating the degree of deterioration. The unit of the fully charged capacity may be "Wh", and the capacity retention rate (power capacity retention rate) may indicate the degree of deterioration.

Further, in the above-described embodiment, the vehicle use flag is stored in the memory 102 of the assembled battery 100. For example, in the memory 102 of the assembled battery 100, the assembled battery 100 is specified instead of the vehicle use flag. The ID information for the operation may be stored, and the vehicle use flag corresponding to the assembled battery 100 may be stored in the server or the like together with the ID information. In this case, the control device 300 acquires the ID information from the memory 102 and also acquires the vehicle use flag corresponding to the ID information acquired from the server.

In addition, the above-mentioned modification may be carried out by appropriately combining all or a part thereof.

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

1 vehicle, 2 drive system, 3 housing, 4 electric load, 5 power converter, 6 electric equipment, 20 power transmission gear, 30 drive wheels, 40 PCU, 50 SMR, 100 sets of batteries, 102 memory chips, 210 voltage detector , 220 current detector, 230 temperature detector, 300 control device, 301 CPU, 302 memory, 400 display device.

Claims (1)

A display device that displays the degree of deterioration of a secondary battery used as a power supply source for a drive motor that drives an electric vehicle using a scale.
A display device configured to display the upper limit value of the degree of deterioration in which the secondary battery can be used together with the degree of deterioration of the secondary battery by changing the upper limit value according to the use of the secondary battery.

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