Power management device for an electric vehicle

Abstract

This power source management device for an electric vehicle comprises: a contactor that electrically connects or disconnects a driving battery and an auxiliary battery; and a DCDC converter that enables power supply from the driving battery to the auxiliary battery when the driving battery and the auxiliary battery are electrically connected. The power source management device comprises: an auxiliary charging management unit in which is provided a request evaluating unit that outputs a connection request for the contactor for only a predetermined charging period when a predetermined timing is reached; a connection management unit in which is provided a charging execution evaluating unit that evaluates whether the contactor is connected upon receiving the connection request for the contactor; and a display management unit that is connected to a display, wherein the display management unit has an execution impossibility display unit that displays, on the display, a predetermined message when the charging execution evaluating unit evaluates that connection is impossible.

Description

Technical Field

[0001] The present disclosure relates to a power management device for an electric vehicle.

Background Art

[0002] Patent Document 1 discloses an electric vehicle including a driving battery that supplies power to a traveling motor driven at a high voltage and an auxiliary battery that supplies power to auxiliary devices driven at a low voltage. When such an electric vehicle equipped with a driving battery and an auxiliary battery is left unattended, the stored power of the auxiliary battery gradually decreases. Therefore, by electrically connecting the auxiliary battery to the driving battery and starting a DCDC converter at regular intervals, power is supplied from the driving battery to the auxiliary battery to charge the auxiliary battery (charging the auxiliary battery at regular intervals in this way is referred to as "periodic auxiliary charging").

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, if periodic auxiliary charging is not performed for some reason, eventually the stored power of the auxiliary battery will decrease, and the electric vehicle cannot be started.

[0005] In view of the above circumstances, at least one embodiment of the present invention aims to provide a power management device for an electric vehicle that can notify the user that auxiliary charging could not be performed when periodic auxiliary charging could not be performed for some reason.

Means for Solving the Problems

[0006] (1) The power management device for an electric vehicle according to at least one embodiment of the present invention includes a contactor that electrically connects or disconnects a driving battery and an auxiliary battery, and a DCDC converter that enables power supply from the driving battery to the auxiliary battery when the driving battery and the auxiliary battery are electrically connected. The power management device for an electric vehicle is provided with an auxiliary charging management unit having a request determination unit that outputs a connection request for the contactor for a predetermined charging period at a predetermined timing, a connection management unit having a charging execution determination unit that determines whether the contactor can be connected when a connection request for the contactor is input, and a display management unit to which a display is connected. The display management unit has an unexecutable display unit that displays a predetermined message on the display when the charging execution determination unit determines that connection is impossible.

[0007] According to the configuration of (1) above, since a predetermined message is displayed on the display when connection of the contactor is impossible, it is possible to notify the user that auxiliary charging (periodic auxiliary charging) could not be performed.

[0008] (2) The power management device for an electric vehicle according to some embodiments, in the configuration of (1) above, the unexecutable display unit displays the message on the display when the display is activated.

[0009] According to the configuration of (2) above, since the message is displayed on the display when the display is activated, it is possible to notify the user that auxiliary charging could not be performed when the user activates the display (when the electric vehicle is set to Ready On).

[0010] (3) The power management device for an electric vehicle according to some embodiments, in the configuration of (1) or (2) above, the connection management unit has a count unit that counts the number of times the charging execution determination unit determines that connection is impossible, and the auxiliary charging management unit has a timing change unit that shortens the period until the predetermined timing as the number of times counted by the count unit increases.

[0011] According to the configuration of (3) above, as the number of times counted by the counting unit increases, the period until a predetermined timing is shortened, so the start timing of charging (periodic auxiliary machine charging) is advanced, and the frequency of the electric vehicle being unable to start due to insufficient stored power in the auxiliary machine battery can be reduced.

[0012] (4) In the power management device for an electric vehicle according to some embodiments, in the configuration of (3) above, when the charging execution determination unit determines that connection is possible, the counting unit resets the number of times.

[0013] According to the configuration of (4) above, since the counting unit resets the number of times when the charging execution determination unit determines that connection is possible, the start timing of charging (periodic auxiliary machine charging) becomes a predetermined timing, and overcharging of the auxiliary machine battery can be prevented.

[0014] (5) In the power management device for an electric vehicle according to some embodiments, in any one of the configurations of (1) to (4) above, the auxiliary machine charging management unit has a charging period extension unit that extends the charging period when the charging execution determination unit determines that connection is impossible.

[0015] According to the configuration of (5) above, since the charging period is extended when the charging execution determination unit determines that connection is impossible, the charging time of charging (periodic auxiliary machine charging) at the next timing is extended, and the frequency of the electric vehicle being unable to start due to insufficient stored power in the auxiliary machine battery can be reduced.

[0016] (6) In the power management device for an electric vehicle according to some embodiments, in any one of the configurations of (1) to (5) above, the auxiliary machine charging management unit has a start date and time determination unit that determines the predetermined timing, and the display management unit has a start timing display unit that displays the predetermined timing on the display.

[0017] According to the configuration of (6) above, it is possible to notify the user of a predetermined timing, that is, the timing to start charging the auxiliary battery next.

[0018] (7) In the power management device for an electric vehicle according to some embodiments, in any one of the configurations of (1) to (6) above, the auxiliary charging management unit has a remaining period measurement unit that measures the period until the end of the charging period, and the display management unit has a period display unit that displays the period until the end of the charging period on the display.

[0019] According to the configuration of (7) above, it is possible to notify the user of the period until the charging of the auxiliary battery is completed.

[0020] (8) In the power management device for an electric vehicle according to some embodiments, in any one of the configurations of (1) to (7) above, the display is a display provided on a communication terminal, and the display management unit has a communication unit capable of communicating with the communication terminal.

[0021] According to the configuration of (8) above, since a predetermined message is displayed on the display provided on the communication terminal when the connection of the contactor is impossible, the user can know that the auxiliary charging (periodic auxiliary charging) could not be performed.

Advantages of the Invention

[0022] According to at least one embodiment of the present invention, it is possible to notify the user that the auxiliary charging could not be performed.

Brief Description of the Drawings

[0023]

Figure 1

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Figure 8

[0024] Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples.

[0025] [Embodiment 1] [Configuration of Power Management Device] FIG. 1 is a block diagram schematically showing a power management device 1A of an electric vehicle according to Embodiment 1.

[0026] The power management device 1A of the electric vehicle according to Embodiment 1 is adopted in electric vehicles such as electric cars, hybrid cars, and plug-in hybrid cars. A plug-in hybrid car can be externally charged and can also supply power externally.

[0027] As shown in FIG. 1, the electric vehicle includes a contactor 7 that electrically connects or disconnects the drive battery 3 and the auxiliary battery 5. A DCDC converter 9 is provided between the contactor 7 and the auxiliary battery 5. The DCDC converter 9 is for converting the voltage of the drive battery 3 into a voltage that can be supplied to the auxiliary battery 5, and is activated when the drive battery 3 and the auxiliary battery 5 are electrically connected by the contactor 7, and stops when the drive battery 3 and the auxiliary battery 5 are electrically disconnected by the contactor 7.

[0028] The power management device 1A of the electric vehicle includes an auxiliary battery charging management unit 11, a connection management unit 13, and a display management unit 15. The auxiliary battery charging management unit 11, the connection management unit 13, and the display management unit 15 are each composed of a processor (not shown) such as an arithmetic device, a register for storing instructions and information, and a peripheral circuit, a memory (not shown) such as a ROM (Read Only Memory) and a RAM (Random Access Memory), and an input interface (not shown). The auxiliary battery 5 is connected to the auxiliary battery charging management unit 11, the connection management unit 13, and the display management unit 15, and power is constantly supplied from the auxiliary battery 5 to the auxiliary battery charging management unit 11, the connection management unit 13, and the display management unit 15.

[0029] The auxiliary battery charging management unit 11 is provided with a request determination unit 17 that outputs a connection request for the contactor 7 for a predetermined charging period at a predetermined timing. The predetermined timing is the timing to start regular auxiliary battery charging, and the predetermined charging period is the charging period of regular auxiliary battery charging.

[0030] For example, the auxiliary machine charging management unit 11 is provided with a start date and time determination unit 19 that determines the timing to start regular auxiliary machine charging, and a remaining period measurement unit 21 that measures the period (remaining period) until the regular auxiliary machine charging ends. When the timing to start the regular auxiliary machine charging determined by the start date and time determination unit 19 arrives, the request determination unit 17 is configured to output a connection request for the contactor 7 as long as the remaining period measured by the remaining period measurement unit 21 remains. The timing to start the regular auxiliary machine charging is, for example, the date and time when a predetermined period has elapsed since the end of the previous auxiliary machine charging (not limited to regular auxiliary machine charging). For example, when the current date and time managed by the clock information management unit 23 connected to the auxiliary machine charging management unit 11 reaches the timing to start the regular auxiliary machine charging determined by the start date and time determination unit 19, the start date and time determination unit 19 is configured to output a regular auxiliary machine charging start request. Also, for example, the remaining period measurement unit 21 is configured to start measuring the remaining period when a regular auxiliary machine charging start request is input, and end the measurement of the remaining period when the regular auxiliary machine charging ends, and is configured to output a regular auxiliary machine charging request as long as the remaining period remains. Also, for example, the request determination unit 17 is configured to output a connection request for the contactor 7 only during the period when a regular auxiliary machine charging request is input.

[0031] The connection management unit 13 is provided with a charging execution determination unit 25 that determines whether the contactor 7 can be connected when a connection request for the contactor 7 is input.

[0032] For example, a state management unit 29 provided with an information acquisition unit 27 that acquires opening and closing information of opening and closing members such as an engine hood, a tailgate, and a rear door is connected to the charging execution determination unit 25. The charging execution determination unit 25 is configured to determine that connection is possible when all of these opening and closing members are closed, while determining that connection is not possible when at least one of these opening and closing members is open.

[0033] Further, when the charging execution determination unit 25 determines that connection is possible, it outputs a connection request to the contactor 7 only during the period in which a connection request for the contactor 7 is output from the request determination unit 17. On the other hand, when it determines that connection is not possible, it is configured to immediately output a disconnection request to the contactor 7.

[0034] A display 31 is connected to the display management unit 15, and a non-executable display unit 33 is provided. The display 31 is, for example, a multi-information display 37 provided in the meter 35. When the charging execution determination unit 25 determines that connection is not possible, the non-executable display unit 33 causes the display 31 to display a predetermined message. The predetermined message is, for example, a message such as "Since the last startup, the auxiliary battery has not been chargeable. Please perform driving, normal charging, or rapid charging for a while.", but is not limited thereto.

[0035] For example, when the charging execution determination unit 25 determines that connection is not possible, the non-executable display unit 33 causes the display 31 to display a predetermined message when the display 31 is started next (for example, when the electric vehicle is set to Ready On), but may immediately cause the display 31 to display the predetermined message.

[0036] In addition, the display management unit 15 is provided with a start timing display unit 39 that causes the display 31 to display the timing for starting the periodic auxiliary charging. As described above, the timing for starting the periodic auxiliary charging is determined by the start date and time determination unit 19 provided in the auxiliary charging management unit 11. Therefore, the start timing display unit 39 causes the display 31 to display that timing. The timing is displayed, for example, as "The scheduled date and time for starting the next charging of the auxiliary battery is around XX:XX on XX / XX / XXXX".

[0037] In addition, the display management unit 15 is provided with a period display unit 41 that causes the display 31 to display the period until the charging period ends. As described above, the period until the charging period ends is measured by the remaining period measurement unit 21. Therefore, the period display unit 41 causes the display 31 to display that period. For example, the period is displayed as "Charging the auxiliary battery. ○:○○ until completion".

[0038] In addition, the display management unit 15 is provided with a communication unit 45 that can communicate with the communication terminal 43, and a predetermined message, the timing to start periodic auxiliary charging, and the time until the charging period ends are displayed on the display 31 provided on the communication terminal 43. For example, the communication terminal 43 is a smartphone 47, and the display 31 is a display 49 provided on the smartphone 47, but it is not limited to this.

[0039] [Operation of the power management device 1A] FIG. 2 is a flowchart schematically showing the operation of the power management device 1A of the electric vehicle according to Embodiment 1.

[0040] As shown in FIG. 2, in the power management device 1A of the electric vehicle according to Embodiment 1, when it is time to start periodic auxiliary charging (step S11: Yes), the request determination unit 17 outputs a connection request for the contactor 7 for a predetermined period (step S13). When this connection request for the contactor 7 is input to the charging execution determination unit 25, the charging execution determination unit 25 determines whether the contactor 7 can be connected (step S15). When the charging execution determination unit 25 determines that connection is possible, the charging execution determination unit 25 outputs a connection request for the contactor 7 until the period during which a periodic auxiliary charging request is output from the remaining period measurement unit 21 ends (steps S17 to S21). As a result, the contactor 7 electrically connects the drive battery 3 and the auxiliary battery 5 until the predetermined period ends at the predetermined timing. As a result, power is supplied from the drive battery 3 to the auxiliary battery 5, and the auxiliary battery 5 is charged (periodic auxiliary charging).

[0041] On the other hand, when the charging execution determination unit 25 determines that connection is impossible while the driving battery 3 and the auxiliary machine battery are electrically connected (step S19: No), the charging execution determination unit 25 outputs a disconnection request for the contactor 7 (step S23). As a result, the contactor 7 immediately electrically disconnects the driving battery 3 and the auxiliary machine battery 5. As a result, the power supply from the driving battery 3 to the auxiliary machine battery is interrupted, and the charging of the auxiliary machine battery 5 is aborted.

[0042] On the other hand, when the charging execution determination unit 25 determines that connection is impossible even though a connection request for the contactor 7 is input to the charging execution determination unit 25 (step S15: No), the process ends without outputting a connection request for the contactor 7. Then, when the charging execution determination unit 25 determines that connection is impossible, the non-executable display unit 33 causes the display 31 to display a predetermined message (step S25).

[0043] [Effect] According to the power management device 1A for an electric vehicle according to Embodiment 1, since a predetermined message is displayed on the display 31 when connection of the contactor 7 is impossible, it is possible to notify the user that auxiliary machine charging (periodic auxiliary machine charging) could not be performed.

[0044] In addition, since a message is displayed on the display 31 when the display 31 is activated, it is possible to notify the user that auxiliary machine charging could not be performed when the user activates the display 31 (for example, when the electric vehicle is set to Ready On).

[0045] In addition, since the predetermined timing, that is, the timing to start charging the auxiliary machine battery 5 next, is displayed on the display 31, it is possible to notify the user of the timing to start charging the auxiliary machine battery 5 next.

[0046] In addition, since the period until the end of the charging period is displayed on the display 31, it is possible to notify the user of the period until the charging of the auxiliary machine battery 5 ends.

[0047] In addition, since the communication unit 45 can communicate with the communication terminal 43, a predetermined message is displayed on the display 31 provided in the communication terminal 43 when the connection of the contact 7 is impossible. Thereby, the user can know that the auxiliary machine charging (periodic auxiliary machine charging) could not be performed.

[0048] [Embodiment 2] [Configuration of Power Management Device] FIG. 3 is a block diagram schematically showing a power management device 1B for an electric vehicle according to Embodiment 2.

[0049] The configuration of the request determination unit 17 of the auxiliary machine charging management unit 11, the charging execution determination unit 25 of the auxiliary machine management unit, and the display management unit 15 of the power management device 1B for an electric vehicle according to Embodiment 2 is the same as the configuration of the request determination unit 17 of the auxiliary machine charging management unit 11, the charging execution determination unit 25 of the auxiliary machine management unit, and the display management unit 15 of the power management device 1A for an electric vehicle according to Embodiment 1.

[0050] As shown in FIG. 3, the connection management unit 13 according to Embodiment 2 is provided with a count unit 51 that counts the number of times the charging execution determination unit 25 determines that the connection is impossible. The count unit 51 resets the number of times when the charging execution determination unit 25 determines that the connection is possible, but is not limited thereto. For example, it may be reset when the number of times the connection is determined to be possible reaches a predetermined number of times.

[0051] The auxiliary machine charging management unit 11 according to Embodiment 2 is provided with a timing change unit 53 that shortens the period until the start of periodic auxiliary machine charging as the number of times counted by the count unit 51 increases.

[0052] For example, as shown in FIG. 4, when the timing change unit 53 sets the start timing of the regular auxiliary machine charging to be after the TA period (initial value) from the end of the previous auxiliary machine charging, and the charging execution determination unit 25 determines that connection is impossible and the regular auxiliary machine charging fails, the start timing of the next regular auxiliary machine charging is set to the TB period, which is shorter than the TA period. Then, when the regular auxiliary machine charging fails after the TB period, the timing change unit 53 sets the start timing of the next regular auxiliary machine charging to the TC period, which is even shorter than the TB period.

[0053] Also, for example, when the start timing of the regular auxiliary machine charging is set to a period shorter than the TA period, and the charging execution determination unit 25 determines that connection is possible, the count unit 51 resets the count, and the timing change unit 53 sets the start timing of the next regular auxiliary machine charging to the TA period (initial value).

[0054] [Operation of Power Management Device 1B] FIG. 5 is a flowchart schematically showing the operation of the power management device 1B of the electric vehicle according to Embodiment 2.

[0055] The operations of the request determination unit 17 of the auxiliary machine charging management unit 11, the charging execution determination unit 25 of the auxiliary machine management unit, and the display management unit 15 of the power management device 1B of the electric vehicle according to Embodiment 2 are the same as the operations of the request determination unit 17 of the auxiliary machine charging management unit 11, the charging execution determination unit 25 of the auxiliary machine management unit, and the display management unit 15 of the power management device 1A of the electric vehicle according to Embodiment 1.

[0056] In the power management device 1B for an electric vehicle according to Embodiment 2, when the charging execution determination unit 25 determines that connection is impossible even if a connection request for the contactor 7 is input, the counting unit 51 counts the number of times connection has been determined to be impossible (step S27). When the counting unit 51 counts that connection is impossible, the timing change unit 53 sets the timing for starting the next periodic auxiliary machine charging to a TB period shorter than the TA period (step S29). Then, when the periodic auxiliary machine charging after the TB period fails, the timing change unit 53 sets the timing for starting the periodic auxiliary machine charging to a TC period shorter than the B period (step S29).

[0057] When the start value timing of the periodic auxiliary machine charging is set to a period shorter than the TA period, if the charging execution determination unit 25 determines that connection is possible (step S15: Yes), the counting unit 51 resets the counted number of times (step S31). As a result, the timing change unit 53 sets the timing for starting the next periodic auxiliary machine charging to the TA period (initial value).

[0058] [Effect] According to the power management device 1B for an electric vehicle according to Embodiment 2, since the period until a predetermined timing is shortened as the number of times counted by the counting unit 51 increases, the start timing of charging (periodic auxiliary machine charging) is advanced, the frequency with which the storage power of the auxiliary machine battery 5 becomes insufficient and the electric vehicle cannot run on the track can be reduced.

[0059] Further, since the counting unit 51 resets the number of times determined to be impossible to connect when the charging execution determination unit 25 determines that connection is possible, the start timing of charging (periodic auxiliary machine charging) becomes the predetermined timing, and overcharging of the auxiliary machine battery 5 can be prevented.

[0060] [Embodiment 3] [Configuration of Power Management Device] FIG. 6 is a block diagram schematically showing a power management device 1C for an electric vehicle according to Embodiment 3.

[0061] The configurations of the request determination unit 17 of the auxiliary machine charging management unit 11, the charging execution determination unit 25 of the auxiliary machine management unit, and the display management unit 15 of the power management device 1C of the electric vehicle according to Embodiment 3 are the same as those of the request determination unit 17 of the auxiliary machine charging management unit 11, the charging execution determination unit 25 of the auxiliary machine management unit, and the display management unit 15 of the power management device 1A of the electric vehicle according to Embodiment 1.

[0062] As shown in FIG. 6, the connection management unit 13 according to Embodiment 3 includes a charging period extension unit 55 that extends the charging period when the charging execution determination unit 25 determines that connection is impossible.

[0063] For example, as shown in FIG. 7, when the charging period is the TX period (initial value), if the regular auxiliary machine charging fails because the charging execution determination unit 25 determines that connection is impossible, the charging period extension unit 55 sets the charging period of the next regular auxiliary machine charging to the TY period, which is longer than the TX period.

[0064] Also, for example, when the charging period of the regular auxiliary machine charging is set to a period longer than the TX period, if the charging execution determination unit 25 determines that connection is possible, the charging period extension unit 55 sets the charging period of the next regular auxiliary machine charging to the TX period (initial value).

[0065] [Operation of Power Management Device 1C] FIG. 8 is a flowchart schematically showing the operation of the power management device 1C of the electric vehicle according to Embodiment 3.

[0066] The operations of the request determination unit 17 of the auxiliary machine charging management unit 11, the charging execution determination unit 25 of the auxiliary machine management unit, and the display management unit 15 of the power management device 1C of the electric vehicle according to Embodiment 3 are the same as those of the request determination unit 17 of the auxiliary machine charging management unit 11, the charging execution determination unit 25 of the auxiliary machine management unit, and the display management unit 15 of the power management device 1A of the electric vehicle according to Embodiment 1.

[0067] As shown in Fig. 8, in the power supply management device 1C of the electric vehicle according to Embodiment 3, when the charging execution determination unit 25 determines that the connection is impossible even if a connection request for the contactor 7 is input to the charging execution determination unit 25, the charging period extension unit 55 sets the charging time of the periodic auxiliary machine charging to a TY period longer than the TX period (step S33).

[0068] When the charging execution determination unit 25 determines that the connection is possible (step S15: Yes) when the charging period of the periodic auxiliary machine charging is set to a period shorter than the a period, the charging period extension unit 55 sets the charging period of the periodic auxiliary machine charging to the TX period (initial value) (step S35).

[0069] [Effect] According to the power supply management device 1C of the electric vehicle according to Embodiment 3, since the charging period extension unit 55 extends the charging period when the charging execution determination unit 25 determines that the connection is impossible, the charging time of the next charging (periodic auxiliary machine charging) is extended, the stored power of the auxiliary machine battery 5 is insufficient, and the frequency at which the electric vehicle cannot be started can be reduced.

Explanation of Signs

[0070] 1A, 1B, 1C Power supply management device 3 Driving battery 5 Auxiliary machine battery 7 Contactor 9 DCDC converter 11 Auxiliary machine charging management unit 13 Connection management unit 15 Display management unit 17 Request determination unit 19 Start date and time determination unit 21 Remaining period measurement unit 23 Clock information management unit 25 Charging execution determination unit 27 Information acquisition unit 29 State management unit 31 Display 33 Non-executable display unit 35 Meter 37 Multi-information display 39 Start timing display unit 41 Period display unit 43 Communication terminal 45 Communication section 47 Smartphone 49 Display 51 Counting section 53 Timing change section 55 Charging period extension section

Claims

1. A contactor that electrically connects or disconnects a driving battery and an auxiliary machine battery, A DC-DC converter that enables power supply from the driving battery to the auxiliary machine battery when the driving battery and the auxiliary machine battery are electrically connected, A power management device for an electric vehicle, comprising: An auxiliary machine charging management unit provided with a request determination unit that outputs a connection request for the contactor for a predetermined charging period at a predetermined timing; A connection management unit provided with a charging execution determination unit that determines whether the contactor can be connected when a connection request for the contactor is input; A display management unit to which a display is connected, Comprising: The display management unit has an unexecutable display unit that displays a predetermined message on the display when the charging execution determination unit determines that connection is impossible; The connection management unit has a count unit that counts the number of times the charging execution determination unit determines that connection is impossible; The auxiliary machine charging management unit has a timing change unit that shortens the period until the predetermined timing as the number of times counted by the count unit increases. A power management device for an electric vehicle.

2. A contactor that electrically connects or disconnects a driving battery and an auxiliary machine battery, A DC-DC converter that enables power supply from the driving battery to the auxiliary machine battery when the driving battery and the auxiliary machine battery are electrically connected, A power management device for an electric vehicle, comprising: An auxiliary machine charging management unit provided with a request determination unit that outputs a connection request for the contactor for a predetermined charging period at a predetermined timing; A connection management unit provided with a charging execution determination unit that determines whether the contactor can be connected when a connection request for the contactor is input; A display management unit to which a display is connected, Comprising: The display management unit has an unexecutable display unit that displays a predetermined message on the display when the charging execution determination unit determines that connection is impossible; The auxiliary machine charging management unit has a charging period extension unit that extends the charging period when the charging execution determination unit determines that connection is impossible. A power management device for an electric vehicle.

3. The unexecutable display unit displays the message on the display when the display is activated. The power management device for an electric vehicle according to Claim 1 or 2.

4. When the charging execution determination unit determines that connection is possible, the counting unit resets the number of times. The power management device for an electric vehicle according to claim 1.

5. The auxiliary machine charging management unit includes a start date and time determination unit that determines the predetermined timing. The display management unit includes a start timing display unit that displays the predetermined timing on the display. The power management device for an electric vehicle according to any one of claims 1 to 4.

6. The auxiliary machine charging management unit includes a remaining period measurement unit that measures the period until the charging period ends. The display management unit includes a period display unit that displays the period until the charging period ends on the display. The power management device for an electric vehicle according to any one of claims 1 to 5.

7. The display is a display provided on a communication terminal. The display management unit includes a communication unit capable of communicating with the communication terminal. The power management device for an electric vehicle according to any one of claims 1 to 6.

8. (Deleted)

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