Vehicle and charging system

Abstract

Disclosed are a vehicle and a charging system. The above-described processing section (37) of the vehicle (2) stops charging when the measured charging ratio becomes equal to or greater than the target charging ratio during a charging phase. The above-described processing section (37) transmits the measured charging ratio to the charging device (3) as the transmitted charging ratio (91) when the measured charging ratio is less than the charging threshold (TH1) in the case where the target charging ratio is greater than the charging threshold (TH1), transmits a value less than the charging threshold (TH1) to the charging device (3) as the transmitted charging ratio (91) in the case where the measured charging ratio is greater than the charging threshold (TH1) and less than the target charging ratio, and transmits the measured charging ratio to the charging device (3) as the transmitted charging ratio (91) in the case where the measured charging ratio is equal to or greater than the target charging ratio.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a vehicle and a charging system. BACKGROUND

[0002] Various schemes have been proposed regarding a charging system including a vehicle equipped with an electrical storage device and a charging device that charges the electrical storage device.

[0003] For example, in the charging system described in Japanese Patent Application Publication No. 2020-124033, the vehicle transmits an instruction value of a charging current to the charging device, and the charging device adjusts the charging current in accordance with the received instruction value. SUMMARY

[0004] Here, the electrical storage device mounted on the vehicle is provided by various electrical storage device manufacturers. Therefore, there are cases where the quality of the electrical storage device mounted on the vehicle is deviated.

[0005] In the case where the quality is deviated, depending on the electrical storage device, there are cases where the electrical storage device can be damaged when charged to a high SOC. Thus, there are cases where the charging device is set in such a manner that the charging is stopped when the SOC becomes a prescribed value in order to suppress the damage of the electrical storage device.

[0006] As a result, for example, in the case where the user intends full charging or charging to a predetermined target SOC as a target SOC, it is also possible that the charging is stopped before becoming full charging or the target SOC.

[0007] The present disclosure was achieved in view of the problems as described above, and an object thereof is to provide a vehicle and a charging system in which it is also possible to charge to a high SOC in the case where an electrical storage device is charged using a charging device that stops charging when the SOC becomes a prescribed value.

[0008] The vehicle of the present disclosure receives electric power from a charging device provided outside to charge an electrical storage device mounted thereon, wherein the charging device stops charging to the vehicle when a first charging ratio transmitted from the vehicle is greater than a prescribed value. The above vehicle is provided with: an electrical storage device; a processing portion that calculates a second charging ratio that indicates a charging ratio of the electrical storage device; and a communication portion that transmits the first charging ratio to the charging device. The above processing portion stops charging when the second charging ratio becomes a prescribed third charging ratio or more in a charging phase, and the processing portion transmits the second charging ratio as the first charging ratio to the charging device in the case where the second charging ratio is less than or equal to a charging threshold value related to the prescribed value when the third charging ratio is greater than the charging threshold value, transmits a value less than or equal to the charging threshold value as the first charging ratio to the charging device in the case where the second charging ratio is greater than the charging threshold value and less than the third charging ratio, and transmits the second charging ratio as the first charging ratio to the charging device in the case where the second charging ratio is the third charging ratio or more.

[0009] According to the above-described vehicle, in a case where the electric storage device is charged using the charging device that stops charging when the SOC becomes the prescribed value, the electric storage device can also be charged to a high SOC.

[0010] The charging system of the present disclosure includes an electric storage vehicle and a charging device. The charging device stops charging to the vehicle when a first charge ratio transmitted from the vehicle is greater than a prescribed value. The vehicle includes an electric storage device, a processing portion that calculates a second charge ratio that indicates a charge ratio of the electric storage device, and a communication portion that transmits the first charge ratio to the charging device. The processing portion stops charging when the second charge ratio becomes a third charge ratio or greater in a charging phase, and in a case where the third charge ratio is greater than a charge threshold value related to the prescribed value, the processing portion transmits the second charge ratio as the first charge ratio to the charging device when the second charge ratio is the charge threshold value or less, transmits a value that is the charge threshold value or less as the first charge ratio to the charging device when the second charge ratio is greater than the charge threshold value and less than the third charge ratio, and transmits the second charge ratio as the first charge ratio to the charging device when the second charge ratio is the third charge ratio or greater.

[0011] According to the above-described charging system, in a case where the electric storage device is charged using the charging device that stops charging when the SOC becomes the prescribed value, the electric storage device can also be charged to a high SOC.

[0012] The above and other objects, features, aspects and advantages of the present application will become more apparent from the following detailed description of the present application taken in conjunction with the accompanying drawings, in which: BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a schematic diagram that schematically shows the charging system 1 of the present embodiment 1.

[0014] Figure 2 is a schematic diagram that schematically shows a database DB1 that stores the charge threshold value TH1 of the charging device stored in the server 4.

[0015] Figure 3 is a block diagram in a state where the plug 20 is connected to the charging inlet 13 of the vehicle 2.

[0016] Figure 4 is a flowchart that shows an outline of the charging flow.

[0017] Figure 5 is a flowchart that shows the charging specification configuration phase (Step 50).

[0018] Figure 6is a flowchart showing a part of the flow of the charging phase (Step 60).

[0019] Figure 7 is a flowchart showing the SOC value adjustment control.

[0020] Figure 8 is a flowchart of the charging phase, which is Figure 6 is a flowchart subsequent to the flowchart shown in

[0021] Figure 9 is a flowchart showing the end of the charging phase.

[0022] Figure 10 is a schematic diagram schematically showing the charging system 1A of Embodiment 2.

[0023] Figure 11 is a schematic diagram schematically showing the database DB2 of the server 4 of Embodiment 2.

[0024] Figure 12 is a flowchart showing the flow of the charging specification configuration phase of the charging system 1A.

[0025] Figure 13 is a flowchart showing a part of the flow of the charging phase.

[0026] Figure 14 is a flowchart showing the SOC value adjustment control.

[0027] Figure 15 is a flowchart showing the charging phase, which is Figure 13 is a flowchart subsequent to the flow shown in

[0028] Figure 16 is a schematic diagram schematically showing the charging system 1B.

[0029] Figure 17 is a graph showing the change in the charging power output by the charging system 1B during the charging.

[0030] Figure 18 is a flowchart showing the flow of the charging specification configuration phase.

[0031] Figure 19 is a flowchart showing a part of the flow of the charging phase.

[0032] Figure 20 is a flowchart showing the flow of setting the charging threshold TH5.

[0033] Figure 21 is a flowchart showing the SOC value adjustment control.

[0034] Figure 22is a flowchart of a charging phase, is a flowchart showing Figure 19 the flow shown in FIG. 8. DETAILED DESCRIPTION

[0035] Using Figures 1 to 22 The charging system 1 of the present embodiment will be described. Using Figures 1 to 22 The charging system of the present embodiment will be described.

[0036] (Embodiment 1)

[0037] Figure 1 is a schematic view schematically showing the charging system 1 of the present embodiment 1. The charging system 1 is provided with a vehicle 2, a charging device 3, and a server 4.

[0038] The vehicle 2 is provided with an electric storage device 10, a vehicle controller 37, an external communication section 12, a charging inlet 13, a power wiring 14, a vehicle main body 15, an input section 17, a position detection device 18, and an electronic lock 19.

[0039] The electric storage device 10, the vehicle controller 37, the input section 17, the position detection device 18, and the power wiring 14 are disposed in the vehicle main body 15.

[0040] The electric storage device 10 is, for example, a secondary battery such as a lithium ion battery. The electric storage device 10 includes a plurality of unit cells 16. The electric storage device 10 supplies electric power to a not-shown rotary electric machine, and drives the rotary electric machine.

[0041] The charging inlet 13 is disposed at a side surface of the vehicle main body 15. The charging inlet 13 is configured to be able to connect a plug 20 disposed at the charging device 3. The electronic lock 19 is a device for locking the plug 20 connected to the charging inlet 13.

[0042] The power wiring 14 connects the charging inlet 13 and the electric storage device 10. The power wiring 14 includes a power line and a communication line. The power line of the power wiring 14 connects the charging inlet 13 and the electric storage device 10. Then, electric power supplied from the charging inlet 13 is supplied to the electric storage device 10 via the power wiring 14. The communication line of the power wiring 14 is connected to the charging inlet 13 and the vehicle controller 37 and the BMS 38.

[0043] The external communication section 12 is disposed at an upper surface of the vehicle main body 15. The external communication section 12 is configured to be able to communicate with the server 4, and the vehicle 2 and the server 4 exchange various information.

[0044] The input section 17 is used by the user to input various information. For example, the user can input a target SOC value (third charge ratio) TV when charging the electrical storage device 10. The target SOC value TV input to the input section 17 is stored in the vehicle controller 37. In this specification, the "SOC value" means the "charge ratio". Further, SOC refers to the "State Of Charge" of the electrical storage device 10.

[0045] The position detection device 18 is a device that acquires the position of the vehicle 2. As the position detection device 18, for example, a GPS (Global Positioning System) or the like can be used. The current position information of the vehicle 2 acquired by the position detection device 18 is stored in the vehicle controller 37.

[0046] The vehicle controller 37 includes a BMS (battery management system) 38. The BMS 38 communicates with the charger controller 73 during charging to exchange various information.

[0047] The charging device 3 is provided with a plug 20, a charging cord 21, a charger 22, and a charger controller 73. The plug 20 is configured to be connectable to the charging jack 13.

[0048] The charger 22 is connected to an external power supply 23 provided externally. The charger 22 converts the alternating-current electric power supplied from the external power supply 23 into direct-current electric power.

[0049] The charging cord 21 is connected to the charger 22, and the plug 20 is connected to the front end of the charging cord 21. The charging cord 21 includes a power line and a communication line. The power line of the charging cord 21 connects the plug 20 and the charger 22, and the communication line of the charging cord 21 connects the plug 20 and the charger controller 73.

[0050] Then, the direct-current electric power output from the charger 22 is supplied to the electrical storage device 10 via the power line of the charging cord 21, the plug 20, the charging jack 13, and the power line of the power wiring 14.

[0051] The charger controller 73 exchanges various information with the BMS 38 (vehicle controller 37) via the communication line of the charging cord 21, the plug 20, the charging jack 13, and the communication line of the power wiring 14.

[0052] During the charging of the electrical storage device 10 by the charging device 3, the charger controller 73 receives the transmitted SOC value (first charge ratio) 90 from the BMS 38 via the charging cord 21. Further, the transmitted SOC value 90 is a value transmitted from the vehicle 2 as a value indicating the SOC of the electrical storage device 10 at the present time, but is different from the SOC value as a measured value as described later.

[0053] Then, the charger controller 73 stops charging when the transmitted SOC value 90 becomes a prescribed value TH. The prescribed value TH is, for example, 85% to 95%.

[0054] By setting the prescribed value TH to such a range, even if the electric storage device 10 is one that is easily damaged at a high SOC, for example, damage to the electric storage device 10 can be suppressed.

[0055] The vehicle 2 transmits the completion SOC value 91 to the server 4 at the time of completion of charging. Further, the completion SOC value 91 is an SOC that is actually measured for the SOC of the electric storage device 10 at the time of completion of charging.

[0056] The server 4 receives the completion SOC value 91 at the time of completion of charging from a plurality of vehicles that are charged in the charging device 3. Then, the server 4 predicts the prescribed value TH of the charging device 3 from the plurality of completion SOC values, and calculates the charging threshold value TH1. Then, the calculated charging threshold value TH1 is stored in the storage section of the server 4.

[0057] Then, before the charging stage, the vehicle 2 transmits a request signal that requests the charging threshold value TH1 to the server 4, and the server 4 transmits the charging threshold value TH1 of the charging device 3 to the vehicle 2. The vehicle 2 receives the charging threshold value TH1 via the external communication section 12, and the received charging threshold value TH1 is stored in the storage section of the BMS 38.

[0058] Figure 2 is a schematic view that schematically shows a database DB1 that stores the charging threshold value TH1 of the charging device stored in the server 4.

[0059] The database DB1 stores the ID of each charging device, the position information of the charging device, and the charging threshold value TH1.

[0060] Figure 3 is a block diagram in a state in which the plug 20 is connected to the charging inlet 13 of the vehicle 2.

[0061] The charging inlet 13 includes a DC(+) terminal 50, a DC(-) terminal 51, a PE terminal 52, an S(+) terminal 53, an S(-) terminal 54, a CC1 terminal 55, a CC2 terminal 56, and a frame 57. Each of the terminals 50 to 56 is housed in the frame 57, and each of the terminals is insulated.

[0062] The vehicle 2 includes the electric storage device 10, a vehicle controller 37, a DC(+) wire 30, a DC(-) wire 31, a PE wire 32, an S(+) signal line 33, an S(-) signal line 34, a CC1 communication line 35, a CC2 communication line 36, the vehicle controller 37, contactors K5, K6, and switches S2, Sv.

[0063] The DC(+) wire 30 and the DC(-) wire 31 are connected to the electrical storage device 10. The DC(+) wire 30 is connected to the DC(+) terminal 50, and the DC(-) wire 31 is connected to the DC(-) terminal 51. The PE wire 32 is a ground wire, and is connected to the PE terminal 52.

[0064] The S(+) signal wire 33, the S(-) signal wire 34, the CC1 communication wire 35, and the CC2 communication wire 36 are connected to the vehicle controller 37. The S(+) signal wire 33 is connected to the S(+) terminal 53, and the S(-) signal wire 34 is connected to the S(-) terminal 54. The CC1 communication wire 35 is connected to the CC1 terminal 55, and the CC2 communication wire 36 is connected to the CC2 terminal 56.

[0065] The contactor K5 is provided to the DC(+) wire 30, and the contactor K6 is provided to the DC(-) wire 31. The resistance R4 is connected to the CC1 communication wire 35, and the switch S2 is connected in series to the resistance R4 to the CC1 communication wire 35. The switch Sv is provided to the CC2 communication wire 36. The vehicle controller 37 performs switching control of the on / off of the contactors K5, K6 and the switches S2, Sv.

[0066] The BMS (battery management system) 38 is provided in the vehicle controller 37.

[0067] The charging device 3 includes the charger 22, a DC(+) wire 60, a DC(-) wire 61, a PE wire 62, an S(+) signal wire 63, an S(-) signal wire 64, a CC1 communication wire 65, a CC2 communication wire 66, a contactor K1, a contactor K2, a switch S1, a voltage measuring device 45, a voltage dividing circuit 46, an IMD (Insulation Monitoring Device) 47, and a charger controller 73.

[0068] The plug 20 includes a DC(+) terminal 80, a DC(-) terminal 81, a PE terminal 82, an S(+) terminal 83, an S(-) terminal 84, a CC1 terminal 85, a CC2 terminal 86, and a frame 87. Each terminal is housed in the frame 87.

[0069] The DC(+) wire 60 and the DC(-) wire 61 are connected to the charger 22. The DC(+) wire 60 is connected to the DC(+) terminal 80, and the DC(-) wire 61 is connected to the DC(-) terminal 81. The PE wire 62 is a ground wire, and is connected to the PE terminal 82.

[0070] The S(+) signal line 63, the S(-) signal line 64, and the CC1 communication line 65 are connected to the charger controller 73. The S(+) signal line 63 is connected to the S(+) terminal 83, and the S(-) signal line 64 is connected to the S(-) terminal 84.

[0071] The CC1 communication line 65 is connected to the CC1 terminal 85. One end of the CC2 communication line 66 is connected to the PE line 62, and the other end is connected to the CC2 terminal 86.

[0072] The contactor K1 is provided to the DC(+) terminal 80, and the contactor K2 is provided to the DC(-) terminal 81. The resistance R1 is provided in the CC1 communication line 65, and the switch S1 is connected to the CC1 communication line 65 in parallel with the resistance R1.

[0073] The voltage measuring device 45 is provided so as to connect the DC(+) wiring 60 and the DC(-) wiring 61. Specifically, between the DC(+) terminal 80 and the contactor K1 in the DC(+) wiring 60 and between the DC(-) terminal 81 and the contactor K2 in the DC(-) wiring 61.

[0074] The IMD 47 is provided between the charger 22 and the contactors K1, K2 so as to connect the DC(+) wiring 60 and the DC(-) wiring 61. Further, the IMD 47 is also connected to the PE line 62. The voltage dividing circuit 46 is provided between the charger 22 and the contactors K1, K2 so as to connect the DC(+) wiring 60 and the DC(-) wiring 61.

[0075] In a state in which the plug 20 is connected to the charging outlet 13, the DC(+) terminal 50 is connected to the DC(+) terminal 80, and the DC(-) terminal 51 is connected to the DC(-) terminal 81. The PE terminal 52 is connected to the PE terminal 82, and the S(+) terminal 53 is connected to the S(+) terminal 83. The S(-) terminal 54 is connected to the S(-) terminal 84, and the CC1 terminal 55 is connected to the CC1 terminal 85. The CC2 terminal 56 is connected to the CC2 terminal 86.

[0076] The vehicle controller 37 periodically monitors the detection points P2, P3, and the charger controller 73 periodically monitors the detection point PI.

[0077] The charger controller 73 performs on / off switching control of the charger 22, the switch SI, and on / off switching control of the contactors K1, K2.

[0078] The vehicle controller 37 performs on / off switching control of the switch S2 and the switch Sv and on / off switching control of the contactors K5, K6.

[0079] When the plug 20 is connected to the charging inlet 13 as described above, various controls for implementing charging are performed.

[0080] Figure 4 is a flowchart showing an outline of the charging procedure. In Figure 4 the charging procedure includes a connection confirmation stage (Step 10), an adhesion check stage (Step 20), an insulation test stage (Step 30), a charging handshake stage (Step 40), a charging specification configuration stage (Step 50), a charging stage (Step 60), and a charging end stage (Step 70).

[0081] Here, in the connection confirmation stage, it is confirmed whether the charging inlet 13 and the plug 20 are connected.

[0082] In Figure 3 , in the unconnected state TO (a state in which the charging inlet 13 and the plug 20 are not connected), the switches SI, S2, Sv, the contactors Kl, K2, and the contactors K5, K6 are open. At this time, the voltage of the detection point PI is, for example, 12 V. The voltage of the detection point P2 is 0 V.

[0083] In the connected state Tl (a state in which the plug 20 is inserted into the charging inlet 13), the switches SI, S2, Sv, the contactors Kl, K2, and the contactors K5, K6 are open. The detection point PI is 2.95 V, the detection point P2 is 2.25 V, and the detection point P3 is 0 V. That is, by fitting the plug 20 into the charging inlet 13, the voltage of the detection point PI changes from 12 V to 2.95 V, and the voltage of the detection point P2 changes from 0 V to 2.25 V.

[0084] Then, the charger controller 73 can detect whether the plug 20 is fitted into the charging inlet 13 by detecting a change in the voltage of the detection point PI. The vehicle controller 37 can detect whether the plug 20 is fitted into the charging inlet 13 by detecting a change in the voltage of the detection point P2.

[0085] At the wake-up T2 after the connected state Tl, the switch SI becomes closed. Then, the charger controller 73 starts transmission of a charging handshake message when the voltage of the detection point PI becomes 8.98 V. Further, various messages are executed via the S(+) signal line 63 and the S(+) signal line 33 and the S(-) signal line 64 and the S(-) signal line 34.

[0086] The vehicle controller 37 detects that the detection point P2 is 8.28 V, and confirms that the CC2 communication line 36 and the CC1 communication line 66 are connected. Then, the vehicle controller 37 and the charger controller 73 start transmission and reception of messages.

[0087] At the wake-up T3 after the wake-up T2, the charger controller 73 makes the switch Sv into the closed state. Thereafter, the vehicle controller 37 detects the voltage at the detection point P3, and judges the version of the connected charging device based on the voltage at the detection point P3. For example, in the case where the voltage at the detection point P3 is 6 V, the vehicle controller 37 judges that the ChaoJi charger is connected.

[0088] After the vehicle controller 37 judges the version of the charging device connected to the charging inlet 13, the vehicle controller 37 makes the switch Sv into the open state.

[0089] At the wake-up T4 after the wake-up T3, the vehicle controller 37 makes the electronic lock 19 shown in Fig. 6 open, and locks the charging inlet 13 and the plug 20. In this way, the connection confirmation stage (Step 10) is completed. Figure 1

[0090] Next, the adhesion inspection stage (Step 20) will be described. In the adhesion inspection stage, it is detected whether the contactors K5 and K6 are not adhered. Specifically, in the state where the contactors K5 and K6 are in the open state (disconnected), the vehicle controller 37 makes the contactors K1 and K2 into the open state (disconnected), and the voltage measurement device 45 performs voltage measurement. Then, in the case where the voltage measured by the voltage measurement device 45 does not exceed 10 V, for example, the charger controller 73 judges that the contactors K5 and K6 are not adhered.

[0091] Next, the insulation test stage (Step 30) will be described.

[0092] The vehicle controller 37 makes the contactors K1 and K2 into the closed state (connected). In addition, the contactors K5 and K6 are in the open state (disconnected). Then, the charger controller 73 outputs electric power from the charger 22, and performs an insulation test using the IMD 47. For example, the insulation between the DC (+) wire 60 and the PE wire 62 and the insulation between the DC (-) wire 61 and the PE wire 62 are confirmed.

[0093] Then, when the charger controller 73 confirms that each insulation state is not problematic, the charger controller 73 drives the voltage dividing circuit 46, and thereafter, makes the contactors K1 and K2 into the open state (disconnected). In this way, the insulation test stage is ended.

[0094] Returning to Figure 4 In the handshake stage (Step 40), the BMS 38 and the charger controller 73 exchange a version message, discharge compatibility information, and an identification message.

[0095] ​Next, the charging specification configuration phase (Step 50) is explained. After the completion of the charging handshake phase, the charger controller 73 and the BMS 38 transmit and receive various charging specification messages, and determine whether or not charging can be performed between the two.

[0096] Figure 5 FIG. 6 is a flowchart showing the charging specification configuration phase (Step 50).

[0097] The BMS 38 transmits the power storage battery charging specification message BCP to the charger controller 73 (Step 31).

[0098] The charger controller 73 transmits the charger time synchronization information message CTS, the charger maximum output capability message CML, and the charger charge / discharge direction request message CCD to the BMS 38 (Step 32).

[0099] Then, the BMS 38 determines whether or not charging implementation is not problematic (Step 33). When the BMS 38 determines that charging implementation is not problematic (YES in Step 33), the BMS 38 transmits the charging preparation completion message BRO to the charger controller 73 (Step 34). In addition, when the BMS 38 determines that charging implementation is problematic (NO in Step 33), the BMS 38 transmits an error message (Step 37), and charging is not performed.

[0100] The charger controller 73 determines whether or not charging implementation is not problematic when receiving the power storage battery charging specification message BCP (Step 35). When the charger controller 73 determines that charging implementation is not problematic (YES in Step 35), the charger controller 73 transmits the charger output preparation completion message CRO to the BMS 38 (Step 36). On the other hand, when the charger controller 73 determines that charging is problematic (NO in Step 35), an error message is transmitted (Step 38), and charging is not started.

[0101] In the power storage battery charging specification message BCP, information indicating the maximum allowable charging voltage, the maximum allowable charging current, and the maximum allowable temperature of the power storage device 10 is included.

[0102] In the charger time synchronization information message CTS, time synchronization information transmitted from the charger controller 73 to the BMS 38 is included.

[0103] In the charger maximum output capability message CML, information indicating the maximum output voltage, the minimum output voltage, the maximum output current, and the minimum output current is included.

[0104] The charger charge / discharge direction request message CCD contains information indicating the charge / discharge direction from the charging device 3. For example, "00" indicates charging, and "01" indicates discharging.

[0105] The charging preparation complete message BRO is a message from BMS38 to the charging device 3 indicating that charging is ready. When BMS38 is in the ready state, it closes contactors K5 and K6 (connects) (Step 39).

[0106] The Charger Output Ready Complete Message (CRO) is a message displayed by the charging device 3 to the BMS38 indicating that charging is ready to complete.

[0107] After sending the charger output ready-to-work message CRO, the charger controller 73 closes the contactors K1 and K2 (Step 130).

[0108] Then, BMS38 sends the threshold request signal RS1 to server 4 (Step 132). The threshold request signal RS1 is a signal to server 4 requesting the charging threshold TH1 of charging device 3. The threshold request signal RS1 contains information indicating the current location of vehicle 2.

[0109] When server 4 receives threshold request signal RS1 from vehicle 2, it determines charging device 3 and charging threshold TH1 based on the current location information of vehicle 2 contained in threshold request signal RS1 and database DB1.

[0110] Then, server 4 sends response signal RP1 to vehicle 2 (Step 134). Response signal RP1 contains the determined charging threshold TH1 of charging device 3.

[0111] Next, the charging stage (Step 60) will be explained.

[0112] exist Figure 3 In this process, the charger controller 73 drives the charger 22 to begin charging. During this charging phase, the BMS 38 sends the charging requirements of the energy storage device 10 to the charger controller 73. The charging device 3 adjusts the charging voltage and charging current.

[0113] Figure 6 This is a flowchart illustrating a portion of the charging phase (Step 60).

[0114] When BMS38 receives the charger output ready-to-complete message CRO, it determines whether it has received the charging threshold TH1 from server 4 (Step 140).

[0115] BMS 38 determines whether the target SOC value TV is input (Step 144). When it is determined that the target SOC value TV is not input (NO in Step 144), 100 (%) is set as the target SOC value TV (Step 146).

[0116] Then, the BMS 38 determines whether the target SOC value TV is greater than the charge threshold TH1 (Step 148). Then, in the case where the target SOC value TV is greater than the charge threshold TH1, the SOC value adjustment control is implemented (Step 150). In the case where the target SOC value TV is equal to or lower than the charge threshold TH1 (NO in Step 148), the SOC value adjustment control is not implemented.

[0117] Then, in the case where it is determined that the charge threshold TH1 is not received (NO in Step 140) and in the case where the target SOC value TV is equal to or lower than the charge threshold TH1 (NO in Step 148), the BMS 38 calculates the measured SOC value (second charge ratio) MV (Step 152). Further, the measured SOC value MV is calculated from the measured voltage and the like of the electrical storage device 10, and the measured SOC value MV indicates the actual SOC value at the time point. Next, the BMS 38 sets the measured SOC value MV as the transmission SOC value 90 (Step 154). Further, the transmission SOC value 90 is a value transmitted to the charger controller 73 as described later.

[0118] Figure 7 is a flowchart illustrating the SOC value adjustment control. The BMS 38 calculates the measured SOC value MV of the electrical storage device 10 (Step 200). Next, the BMS 38 determines whether the measured SOC value MV is equal to or lower than the charge threshold TH1 (Step 202). Then, when it is determined that the measured SOC value MV is equal to or lower than the charge threshold TH1 (YES in Step 202), the BMS 38 sets the transmission SOC value 90 to the measured SOC value MV (Step 203).

[0119] The BMS 38 determines whether the measured SOC value MV is less than the target SOC value TV when it is determined that the measured SOC value MV is greater than the charge threshold TH1 (NO in Step 202) (Step 204). Further, in the case where the target SOC value TV is not input, the target SOC value TV is set to 100 (%). That is, it is determined whether the electrical storage device 10 is fully charged.

[0120] BMS 38 sets a value lower than the charging threshold THl to the transmission SOC value 90 when it judges that the measured SOC value MV is lower than the target SOC value TV (YES in Step 204). For example, the charging threshold THl is set to the transmission SOC value 90.

[0121] In this embodiment, the BMS 38 cannot acquire the prescribed value TH set by the charging device 3, and thus estimates the charging threshold THl acquired from the server 4 as the prescribed value TH. Therefore, in a case where the measured SOC value MV is greater than the charging threshold THl and the measured SOC value MV is lower than the target SOC value TV, the vehicle 2 continues charging, and it is intended that the measured SOC value MV becomes the target SOC value TV.

[0122] On the other hand, when the transmission SOC value 90 transmitted to the charger controller 73 is greater than the charging threshold THl, it is possible that the charging is stopped by the charger controller 73.

[0123] Thus, in this embodiment, the value of the transmission SOC value 90 is not set to the measured SOC value MV, but is set to a value lower than the charging threshold THl. Thereby, even if the transmission SOC value 90 is transmitted to the charger controller 73, it is possible to reduce the possibility that the charging is stopped by the charger controller 73.

[0124] Then, the BMS 38 sets the measured SOC value MV to the transmission SOC value 90 when it judges that the measured SOC value MV is equal to or greater than the target SOC value TV (NO in Step 204).

[0125] That is, when the measured SOC value MV becomes the target SOC value TV, it is required that the charging is stopped by the vehicle 2. Further, in Step 148, the target SOC value TV is greater than the charging threshold THl, and the measured SOC value MV is greater than the target SOC value TV. Therefore, as the transmission SOC value 90, the measured SOC value MV is transmitted to the charger controller 73, and thus the possibility that the charging is stopped by the charger controller 73 is high.

[0126] Further, in a case where the target SOC value TV is not input, the target SOC value TV is set to 100 (%) in the above Step 146, and 100 (%) is set as the transmission SOC value 90.

[0127] Next, returning to Figure 6 , the BMS 38 transmits the battery charge request message BCL and the battery charge summary status message BCS to the charger controller 73 (Step 156).

[0128] The charger controller 73 sends a charger charge status message CCS to the BMS 38 (Step 158).

[0129] The battery charge demand message BCL contains information indicating a voltage demand (V), a current demand (A), and a charge mode.

[0130] The battery charge summary status message BCS contains a sent SOC value 90. Further, the battery charge summary status message BCS contains information indicating a measured value of a charge voltage (V), a measured value of a charge current (A), a voltage of a highest unit cell and a number of the highest unit cell, an estimated remaining charge time, and a voltage of a lowest unit cell and a number of the lowest unit cell.

[0131] The highest unit cell indicates a unit cell 16 having the highest voltage among the plurality of unit cells 16 provided in the electrical storage device 10. The lowest unit cell indicates a unit cell 16 having the lowest voltage among the plurality of unit cells 16 provided in the electrical storage device 10.

[0132] In the charger charge status message CCS, information indicating a voltage output value (V), a current output value (A), and a cumulative charge time currently output by the charging device 3 is contained.

[0133] Figure 8 is a flowchart of the charging phase, and is Figure 6 the flowchart shown in FIG. 17. In Figure 8 In Step 170, the BMS 38 determines whether the measured SOC value MV of the electrical storage device 10 is equal to or greater than the target SOC value TV.

[0134] Further, in a case where the target SOC value TV is not input, the target SOC value TV is set to 100 (%) in Step 146 described above. In this case, when the measured SOC value MV becomes 100 (%), and the electrical storage device 10 becomes fully charged, the condition is satisfied.

[0135] When the BMS 38 determines that the measured SOC value MV is equal to or greater than the target SOC value TV (YES in Step 170), the BMS 38 sends a charge stop message BST to the charger controller 73 (Step 172), and causes the charging to enter the charging end phase.

[0136] On the other hand, when the BMS 38 determines that the measured SOC value MV is smaller than the target SOC value TV (NO in Step 170), the BMS 38 determines whether or not the charger stop message CST of the charger described later is received (Step 180). When the BMS 38 determines that the charger stop message CST of the charger is received (YES in Step 180), the BMS 38 transmits the battery stop message BST (Step 172). Then, when the BMS 38 determines that the charger stop message CST of the charger is not received (NO in Step 180), the BMS 38 repeats the control of the charging phase.

[0137] The charger controller 73 determines whether or not the transmitted SOC value 90 is larger than the prescribed value TH (Step 182). Further, the transmitted SOC value 90 is included in the battery charge total status message BCS of Step 156 described above.

[0138] When the charger controller 73 determines that the transmitted SOC value 90 is larger than the prescribed value TH (YES in Step 182), the charger stop message CST of the charger is transmitted to the BMS 38 (Step 184).

[0139] When the charger controller 73 determines that the transmitted SOC value 90 is the prescribed value TH or less (NO in Step 182), the charger controller 73 determines whether or not the battery stop message BST is received (Step 186). When the charger controller 73 determines that the battery stop message BST is received (YES in Step 186), the charger stop message CST of the charger is transmitted (Step 184). On the other hand, when the charger controller 73 determines that the battery stop message BST is not received (NO in Step 186), the control of the charging phase is repeated.

[0140] Next, the charging end phase (Step 70) will be described.

[0141] When the charging is stopped, the charging device 3 and the BMS 38 enter the charging end phase. In this charging end phase, the BMS 38 transmits the SOC and the like at the end of charging to the charger controller 73. The charger controller 73 transmits the output electric power amount and the like during the charging to the BMS 38.

[0142] Figure 9 is a flowchart showing the charging end phase. The BMS 38 transmits the statistics message BSD to the charger controller 73 (Step 190). The charger controller 73 transmits the charger statistics message CSD to the BMS 38 (Step 192).

[0143] Further, the BMS 38 transmits the information Dl (Step 194).

[0144] In the information Dl, the completed SOC value 91, information indicating whether or not the SOC value adjustment control is performed, and information indicating the target SOC value TV are included. Further, in a case where the setting of the target SOC value TV is not performed, 100(%) is transmitted as the target SOC value TV.

[0145] The server 4 updates the charging threshold value TH1 according to the information Dl. For example, in a case where the SOC value adjustment control is not performed, the average value of the completed SOC value 91 in the case where the target SOC value TV is 100(%) is set as the charging threshold value TH1.

[0146] The information Dl is transmitted from a plurality of vehicles to the server 4, and various methods can be employed as a method of calculating the charging threshold value TH1 according to a plurality of information Dl.

[0147] (Embodiment 2)

[0148] The charging system 1A of the present embodiment 2 is described using Figure 10 In the charging system 1A, the charging device 3A is configured to be able to communicate with the server 4A. Figure 10

[0149] The charging device 3A transmits the prescribed value TH to the server 4A. Further, other charging devices, which are not illustrated, also transmit the prescribed value TH to the server 4A, and the server 4A acquires information regarding the prescribed value TH of a plurality of charging devices. The server 4 includes a storage in which a database DB2 is stored.

[0150] Figure 12 is a schematic view schematically showing the database DB2 of the server 4 of the present embodiment 2. The database DB2 includes the charging device ID of each charging device, the position information of each charging device, and the prescribed value TH of each charging device.

[0151] In the charging system 1A of the present embodiment 2, the charging protocol is also performed similarly to the charging procedure of the charging system 1 of the above-described embodiment 1. Thus, mainly the part different from the charging procedure of the charging system 1 is described.

[0152] Figure 12 is a flowchart showing the flow of the charging specification configuration stage of the charging system 1A.

[0153] ​When the BMS 38A of the vehicle 2A transmits the threshold request signal RS1 to the server 4A (Step 132), the server 4A transmits the response signal RP1 to the vehicle 2A (Step 134A). In the threshold request signal RS1, the position information of the vehicle 2A at the start of charging is included. The server 4A determines the charging device 3A from the position information of the vehicle 2A included in the threshold request signal RS1 and the database DB2. Then, the prescribed value TH of the charging device 3A is transmitted to the vehicle 2A.

[0154] Figure 13 is a flowchart showing a part of the flow of the charging phase. In the flow of the charging phase, Step 140A and Step 148A are different from the flow of the charging phase of Embodiment 1.

[0155] The BMS 38A judges whether or not the prescribed value TH is received from the server 4A when the charger output preparation completion message CRO is received (Step 140A).

[0156] Then, the BMS 38A judges whether or not the target SOC value TV is input when it is judged that the prescribed value TH is received (Yes in Step 140A), (Step 144). The BMS 38A judges whether or not the target SOC value TV is larger than the prescribed value TH when it is judged that the target SOC value TV is not input (No in Step 144) (Step 148A).

[0157] Then, the BMS 38A executes the SOC value adjustment control when it is judged that the target SOC value TV is larger than the prescribed value TH (Step 150).

[0158] Figure 14 is a flowchart showing the SOC value adjustment control. Further, the flow of Embodiment 2 is different from the flow of Embodiment 1 in Step 202, Step 206.

[0159] The BMS 38A judges whether or not the measured SOC value MV is the prescribed value TH or less after the measured SOC value MV is calculated (Step 200) (Step 202A).

[0160] Then, the BMS 38A sets the measured SOC value MV to the transmission SOC value 90 when it is judged that the measured SOC value MV is the prescribed value TH or less (Yes in Step 202A) (Step 203).

[0161] The BMS 38A judges whether or not the measured SOC value MV is smaller than the target SOC value TV when it is judged that the measured SOC value MV is larger than the prescribed value TH (No in Step 202A) (Step 204).

[0162] Then, when it is determined that the measured SOC value MV is less than the target SOC value TV (YES in Step 204), the BMS 38A sets the transmission SOC value 90 to a value below the prescribed value TH (Step 206A). When it is determined that the measured SOC value MV is equal to or greater than the target SOC value TV (NO in Step 204), the BMS 38A sets the transmission SOC value 90 to the measured SOC value MV (Step 208).

[0163] Then, returning to Figure 13 , the BMS 38A transmits the battery charge demand message BCL and the battery charge total status message BCS to the charger controller 73A (Step 156). Here, the transmission SOC value 90 is included in the battery charge total status message BCS. Then, the charger controller 73A transmits the charger charge status message CCS to the BMS 38A (Step 158).

[0164] Figure 15 is a flowchart showing the charging phase, and is a flowchart showing the flow subsequent to that shown in Figure 13 . Further, the flow of Embodiment 2 is the same as that of Embodiment 1.

[0165] Then, in the charger controller 73A, when it is also determined that the transmission SOC value 90 is greater than the prescribed value TH (YES in Step 182), the charger controller 73A transmits the charger charge suspension message CST to the BMS 38A (Step 184). Then, the control flow shifts to the charging end phase.

[0166] In the charging system 1A of this Embodiment 2, the charging device 3A transmits the prescribed value TH to the server 4A. Then, before the charging is started, the vehicle 2A receives the prescribed value TH.

[0167] Therefore, in the charging system 1A of Embodiment 2, the transmission SOC value 90 is set using the prescribed value TH instead of the charging threshold value TH1.

[0168] (Embodiment 3)

[0169] The vehicle 2B and the charging system 1B of Embodiment 3 are described using Figure 16 , etc. Figure 16 is a schematic diagram schematically showing the charging system 1B. The charging system 1B is provided with the vehicle 2B and the charging device 3B, and is not provided with a server.

[0170] In the charging system 1B, the transmission SOC value 90 is transmitted by the charging system 1B during charging.

[0171] Figure 17 is a graph showing a change in the charging power output from the charging system IB during the charging.

[0172] In this graph, the vertical axis indicates the transmitted SOC value 90, and the horizontal axis indicates time. Further, in this Figure 17 In the example shown, the transmitted SOC value 90 is a state in which the SOC value adjustment control is not performed.

[0173] The charging device 3B outputs the charging power CP1 when the transmitted SOC value 90 is below the prescribed value TH2. Therefore, the SOC of the electric storage device 10 increases with the passage of time. As a result, the transmitted SOC value 90 received from the vehicle 2B also increases. Thereafter, at time T10, the transmitted SOC value 90 reaches the prescribed value TH2.

[0174] Then, the charging device 3B outputs the charging power CP2 when it is determined that the transmitted SOC value 90 is greater than the prescribed value TH2. Here, the charging power CP2 is smaller than the charging power CP1.

[0175] Therefore, after time T10, the rate of increase of the SOC of the electric storage device 10 decreases. Along with this, the rate of increase of the transmitted SOC value 90 also decreases.

[0176] Thereafter, at time T11, the transmitted SOC value 90 becomes the prescribed value TH. The charging device 3B stops charging when it is determined that the transmitted SOC value 90 becomes the prescribed value TH or more or that the transmitted SOC value 90 becomes the prescribed value TH. Specifically, the charger controller 73 transmits a charger stop message CST.

[0177] In this way, the charging device 3B reduces the charging power when the transmitted SOC value 90 is greater than the prescribed value TH2, thereby suppressing the transmitted SOC value 90 from greatly exceeding the prescribed value TH.

[0178] Further, as described later, the charging device 3B transmits a charger charge state message CCS to the vehicle 2B during the charging phase. In the charger charge state message CCS, the voltage output value (V) and the current output value (A) that the charging device 3B is currently outputting are included.

[0179] Thus, the vehicle 2B can grasp the change in the charging power output from the charging device 3B in accordance with the received charger charge state message CCS.

[0180] The vehicle 2B transmits the battery charge demand message BCL to the charging device 3B, in which the voltage demand (V) and the current demand (A) are included. Then, the vehicle 2B is able to judge that the transmission SOC value 90 exceeds the prescribed value TH2 in a case where the amount of decrease in the charging power is larger than the prescribed value TH3, without the voltage demand (V) and the current demand (A) of the battery charge demand message BCL changing.

[0181] Thus, a value obtained by adding the margin TH4 to the transmission SOC value 90 at the time of judging that the transmission SOC value 90 exceeds the prescribed value TH2 is set as the charging threshold value TH5.

[0182] Then, the vehicle 2B sets the transmission SOC value 90 to a value equal to or lower than the charging threshold value TH5 in a case where the measured SOC value MV is lower than the charging threshold value TH5. Then, the vehicle 2B sets the transmission SOC value 90 to the measured SOC value MV when the measured SOC value MV becomes equal to or higher than the target SOC value TV.

[0183] Figure 18 is a flowchart showing a part of the flow of the charging phase. The BMS 38B judges whether the charger charge state message CCS is received multiple times (Step 140B). After the charging is just started, the BMS 38B does not receive the charger charge state message CCS. Or, sometimes the charger charge state message CCS is received only once. Figure 5 Step 132 and Step 134 shown in FIG. 12 and FIG. 13.

[0184] Figure 19 is a flowchart showing a part of the flow of the charging phase. The BMS 38B judges whether the charger charge state message CCS is received multiple times (Step 140B). After the charging is just started, the BMS 38B does not receive the charger charge state message CCS. Or, sometimes the charger charge state message CCS is received only once.

[0185] In this case (NO in Step 140B), the BMS 38B calculates the measured SOC value MV (Step 152), and sets the transmission SOC value 90 to the measured SOC value MV (Step 154).

[0186] On the other hand, as the charging time elapses, the BMS 38B receives multiple charger charge state messages CCS.

[0187] The BMS 38B sets the charging threshold value TH5 (Step 142B) when judging that the multiple charger charge state messages CCS are received (YES in Step 140B). Figure 20 is a flowchart showing the flow of setting the charging threshold value TH5.

[0188] The BMS 38B determines whether the required power in the battery charge demand message BCL has changed (Step 300). In the battery charge demand message BCL, the voltage demand (V) and the current demand (A) are included, and the required power can be calculated from the voltage demand and the current demand.

[0189] The BMS 38B calculates the charging power when it is determined that the required power has not changed (NO in Step 300). The BMS 38B periodically receives the charger state message CCS.

[0190] The BMS 38B calculates the charging power output by the charging device 3B from the most recently received charger state message CCS. Further, the BMS 38B calculates the charging power output by the charging device 3B from the previously received charger state message CCS.

[0191] The BMS 38B determines whether the decreased charging amount is greater than the prescribed value TH3 (Step 320). The decreased charging amount is a value obtained by subtracting the charging power calculated from the most recent charger state message CCS from the charging power calculated from the previous charger state message CCS.

[0192] For example, in the case where the charging power CP1 changes to the charging power CP2, the decreased charging amount becomes greater than the prescribed value TH3. Figure 17

[0193] The BMS 38B updates the charging threshold TH5 when it is determined that the decreased charging amount is greater than the prescribed value TH3 (YES in Step 320) (Step 330).

[0194] Specifically, the most recent, the transmitted SOC value 90 included in the battery charge demand message BCL transmitted to the charger controller 73B is extracted. Then, a value obtained by adding the margin TH4 to the transmitted SOC value 90 is set as the charging threshold TH5. Further, for example, the margin TH4 is set in a range of 15% or more and 25% or less.

[0195] Further, the initial value of the charging threshold TH5 is 100 (%), and in this Step 330, it is updated to the newly calculated charging threshold TH5.

[0196] On the other hand, the BMS 38B does not update the charging threshold TH5 when it is determined that the required power has changed (YES in Step 300).

[0197] Returning to Figure 19 ​BMS 38B determines whether or not the target SOC value TV is input (Step 144). BMS 38B sets the target SOC value TV to 100 (%) in the case where the target SOC value TV is not input (Step 146), and sets the input value as the target SOC value TV in the case where the target SOC value TV is input.

[0198] BMS 38B then determines whether or not the target SOC value TV is greater than the charge threshold TH5 (Step 148A). BMS 38B then executes SOC value adjustment control when it is determined that the target SOC value TV is greater than the charge threshold TH5 (Step 148A) (Step 150A).

[0199] Figure 21 is a flowchart showing SOC value adjustment control. BMS 38B calculates the measured SOC value MV (Step 200). BMS 38B then determines whether or not the measured SOC value MV is 100 (%) or less (Step 202A).

[0200] BMS 38B then sets the measured SOC value MV as the transmission SOC value 90 when it is determined that the measured SOC value MV is 100 (%) or less (YES in Step 202A).

[0201] On the other hand, BMS 38B determines whether or not the measured SOC value MV is less than the target SOC value TV when it is determined that the measured SOC value MV is greater than the charge threshold TH5 (Step 204). BMS 38B sets a value that is 100 (%) or less than the charge threshold TH5 as the transmission SOC value 90 in the case where the measured SOC value MV is less than the target SOC value TV (YES in Step 204) (Step 206A). On the other hand, BMS 38B sets the measured SOC value MV as the transmission SOC value 90 in the case where the measured SOC value MV is 100 (%) or more than the target SOC value TV (Step 208).

[0202] Returning to Figure 19 BMS 38B transmits the battery charge demand message BCL and the battery charge total status message BCS (Step 156).

[0203] Charger controller 73B sets the charge power when it receives the battery charge demand message BCL (Step 340). Charger controller 73B sets the charge power in accordance with the transmission SOC value 90 included in the battery charge demand message BCL.

[0204] Specifically, as Figure 17As shown, the charging power is set to the charging power CP1 in the case where the transmitted SOC value 90 is below the prescribed value TH2. Then, the charging power is set to the charging power CP2 in the case where the transmitted SOC value 90 is greater than the prescribed value TH2. Further, the charging power CP2 is a value smaller than the charging power CP1.

[0205] Then, the voltage output value (V) and the current output value (A) are set in such a manner as to become the set charging power, and the charger charging state message CCS is transmitted to the BMS 38B (Step 158B).

[0206] Figure 22 is a flowchart of the charging phase, and is a flowchart showing Figure 19 the flow shown in FIG. 18B.

[0207] Then, the charger controller 73B judges whether the transmitted SOC value 90 is greater than the prescribed value TH (Step 182B).

[0208] Then, the charger controller 73B transmits the charger charging stop message CST when the transmitted SOC value 90 becomes greater than the prescribed value TH (Step 184), and shifts to the charging end phase.

[0209] In the charging system IB of this Embodiment 3, the vehicle 2B estimates the prescribed value TH in accordance with the charging condition of the charging device 3B.

[0210] Embodiments of the present application have been described, but the embodiments disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present application is shown by the claims, and is intended to include all modifications equivalent in meaning and scope to the claims.

Claims

1. A vehicle that receives power from an externally located charging device to charge its onboard energy storage device, wherein, When the first charge ratio sent from the vehicle becomes greater than a predetermined value, the charging device stops charging the vehicle. The vehicle has the following features: The energy storage device; The processing unit calculates a second charging ratio representing the charging ratio of the energy storage device; as well as The communication unit sends the first charging ratio to the charging device. During the charging phase, the processing unit stops charging when the second charging ratio reaches or exceeds a predetermined third charging ratio. When the third charging ratio is greater than a charging threshold related to the predetermined value, the processing unit... When the second charging ratio is below the charging threshold, the second charging ratio is sent to the charging device as the first charging ratio. If the second charging ratio is greater than the charging threshold but less than the third charging ratio, the value below the charging threshold is sent to the charging device as the first charging ratio. When the second charging ratio is greater than or equal to the third charging ratio, the second charging ratio is sent to the charging device as the first charging ratio. Wherein, the first charging ratio is a value representing the current charging state of the energy storage device. The second charging ratio is an actual state-of-charge value calculated based on the measured voltage of the energy storage device. The third charging ratio is the target charging state value of the energy storage device. The vehicle and the charging device are configured to communicate with the server. The charging device sends the specified value to the server. The vehicle will send a request signal to the server. When the server receives the request signal, it sends the specified value to the vehicle. The charging threshold is the specified value.

2. The vehicle according to claim 1, wherein, The third charging ratio is the charging ratio when the energy storage device is fully charged.

3. The vehicle according to claim 1, wherein, The vehicle also includes an input unit for the user to input the third charging ratio. The third charging ratio is set by the input unit.

4. The vehicle according to any one of claims 1 to 3, wherein, When the third charging ratio is below the charging threshold... The processing unit sends the second charging ratio as the first charging ratio.

5. The vehicle according to any one of claims 1 to 3, wherein, The vehicle is configured to communicate with the server. When the vehicle is fully charged, it sends the charging percentage at that point to the server. The server calculates the charging threshold based on the charging percentage when charging is complete. The vehicle sends a request signal requesting the charging threshold. When the server receives the request signal, it sends the charging threshold to the vehicle.

6. The vehicle according to any one of claims 1 to 3, wherein, The charging device also includes: Charger, connected to an external power source; Charging plug; The first DC+ wiring and the first DC- wiring connect the charging plug and the charger; The first contactor is disposed on the first DC+ wiring; The second contactor is disposed on the first DC-wiring; as well as An insulation monitoring device is connected to the first DC+ wiring and the first DC- wiring. The vehicle also features: A charging port is connected to the charging plug; An electronic lock secures the charging plug connected to the charging port. The second DC+ wiring and the second DC- wiring connect the charging port and the energy storage device. The third contactor is located in the second DC+ wiring; as well as The fourth contactor is located in the second DC-wiring. After the charging port and the charging plug are locked by the electronic lock, before the charging phase, the charging device confirms that the third and fourth contactors are not stuck together while the first and second contactors are disconnected. After confirming that the third and fourth contactors are not stuck together, connect the first and second contactors to perform an insulation test. After the insulation test is completed, a charging preparation complete message is sent to the vehicle. After receiving the charging preparation complete message, the vehicle sends the first charging ratio to the charging device.

7. A charging system comprising an electric storage vehicle and a charging device, When the first charge ratio sent from the vehicle becomes greater than a predetermined value, the charging device stops charging the vehicle. The vehicle has the following features: Energy storage devices; The processing unit calculates a second charging ratio representing the charging ratio of the energy storage device; as well as The communication unit sends the first charging ratio to the charging device. During the charging phase, when the second charging ratio becomes a third charging ratio or higher, the processing unit stops the charging process. When the third charging ratio is greater than a charging threshold related to the predetermined value, the processing unit... When the second charging ratio is below the charging threshold, the second charging ratio is sent to the charging device as the first charging ratio. If the second charging ratio is greater than the charging threshold but less than the third charging ratio, the value below the charging threshold is sent to the charging device as the first charging ratio. When the second charging ratio is greater than or equal to the third charging ratio, the second charging ratio is sent to the charging device as the first charging ratio. Wherein, the first charging ratio is a value representing the current charging state of the energy storage device. The second charging ratio is an actual state-of-charge value calculated based on the measured voltage of the energy storage device. The third charging ratio is the target charging state value of the energy storage device. The vehicle and the charging device are configured to communicate with the server. The charging device sends the specified value to the server. The vehicle will send a request signal to the server. When the server receives the request signal, it sends the specified value to the vehicle. The charging threshold is the specified value.

8. The charging system according to claim 7, wherein, The charging device also includes: Charger, connected to an external power source; Charging plug; The first DC+ wiring and the first DC- wiring connect the charging plug and the charger; The first contactor is disposed on the first DC+ wiring; The second contactor is disposed on the first DC-wiring; as well as An insulation monitoring device is connected to the first DC+ wiring and the first DC- wiring. The vehicle also features: A charging port is connected to the charging plug; An electronic lock secures the charging plug connected to the charging port. The second DC+ wiring and the second DC- wiring connect the charging port and the energy storage device. The third contactor is located in the second DC+ wiring; as well as The fourth contactor is located in the second DC-wiring. After the charging port and the charging plug are locked by the electronic lock, before the charging phase, the charging device confirms that the third and fourth contactors are not stuck together while the first and second contactors are disconnected. After confirming that the third and fourth contactors are not stuck together, connect the first and second contactors to perform an insulation test. After the insulation test is completed, a charging preparation complete message is sent to the vehicle. After receiving the charging preparation complete message, the vehicle sends the first charging ratio to the charging device.

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