Charging system

Abstract

To eliminate or reduce doubts or discomfort associated with simultaneous charging. [Solution] A charging system that supplies power to multiple storage devices to charge them, a controller 6 that determines the charging order includes a simultaneous charging determination unit 6a that determines whether multiple storage devices are connected, a priority request acceptance unit 6b that accepts a request to charge a specified storage device in priority over other storage devices, a request notification unit 6d that notifies that a request has been made, a priority charging approval unit 6e that approves the priority charging of the specified storage device based on the request, a priority charging instruction unit 6f that, if approved, charges the specified storage device in priority over charging other storage devices, and a basic charging order setting unit 6h that, if there is no priority request or if priority charging is not approved, sets the charging order of the multiple storage devices to the order in which the storage devices are connected to the charging stand.

Description

[Technical Field]

[0001] The present invention relates to a system for charging a power storage device of an electric vehicle or the like, and more particularly to a system for controlling simultaneous charging of secondary batteries in a plurality of power storage devices. [Background technology]

[0002] Patent Document 1 describes a charging system configured to control charging of multiple vehicles equipped with power storage devices. In this system, the multiple vehicles each hold information for determining a charging schedule, and one of the vehicles determines a charging schedule, including the order in which charging will be performed, based on that information. The charging schedule specifies the start and end times or charging order for each vehicle, and is determined with reference to the SOC (State of Charge) of each vehicle and limiting conditions such as the power storage device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-180747 Summary of the Invention [Problem to be solved by the invention]

[0004] With the widespread use of electric vehicles such as battery electric vehicles (BEVs) and plug-in hybrid vehicles (PHEVs), various charging stations (or charging stands) that can be used by any vehicle are being installed. These types of charging stations or charging stands (hereinafter collectively referred to as charging stands) are equipped with multiple charging cables or outlets, allowing multiple vehicles to be charged simultaneously. Although these multiple vehicles have in common the fact that they are equipped with power storage devices, they typically have different power storage device capacities, control systems that control the power storage devices, systems for data communication with external devices, and installed applications. Therefore, multiple vehicles connected to a charging station do not necessarily share common information for charging, and typically cannot exchange information between vehicles, making it difficult to create a charging schedule as described in Patent Document 1.

[0005] Therefore, when multiple vehicles are simultaneously charged at a charging station intended for an unspecified number of electric vehicles, which vehicle completes charging first is determined based on the state of the vehicle or the power storage device, and is subject to chance. For example, even if a vehicle starts charging first, if the following vehicle has a higher SOC or is capable of rapid or ultra-rapid charging, the following vehicle will complete charging before the leading vehicle. Conversely, if a condition that limits charging exists, such as a high temperature in the power storage device, the following vehicle may complete charging later than the other vehicles, even if only a small amount of charge is required or rapid or ultra-rapid charging is possible.

[0006] Conversely, it is possible to complete charging in the order in which the vehicles were connected to the charging station. In this case, if the following vehicles were to wait until the preceding vehicle was fully charged, simultaneous charging would essentially be impossible, thereby undermining the original function of the charging station, which can connect multiple vehicles. Alternatively, it is possible to charge simultaneously, but complete charging in the order in which the vehicles were connected to the charging station. However, in this case, even if charging can be completed in a short time, the inconvenience of longer charging times due to the later connection to the charging station occurs.

[0007] On the other hand, it is also possible to determine the order in which charging is completed for multiple vehicles simultaneously connected to a charging station based on the SOC of each vehicle, the capacity of the power storage device, etc. However, such a configuration has the disadvantage that the driver or owner of a vehicle that completes charging later than a subsequent vehicle may unnecessarily suspect that the reason for the delay in completing charging is due to a malfunction or failure of their own vehicle or the charging station.

[0008] The above-mentioned problem when multiple power storage devices are connected to the same charging station and charged is caused by the charging being performed without the intention or awareness of the person charging. Therefore, the present invention aims to resolve or reduce the doubts or discomfort that accompany simultaneous charging by reflecting the intentions of the parties involved in so-called simultaneous charging. [Means for solving the problem]

[0009] In order to achieve the above-mentioned object, the present invention provides a charging system that supplies external electric power to a plurality of power storage devices via a charging stand to which the power storage devices are connected, and charges the power storage devices, the charging system having a controller that determines the order of charging the plurality of power storage devices connected to the charging stand, the controller comprising: a simultaneous charging determination unit that determines whether a plurality of power storage devices are connected to the charging stand; a priority request acceptance unit that accepts a request made by manual operation to charge a specified power storage device among the plurality of power storage devices in priority to other power storage devices; a request notification unit that notifies the presence of the request; a priority charging approval unit that approves the priority charging of the specified power storage device based on the request in accordance with manual operation; a priority charging instruction unit that, if the priority charging approval unit has given approval, charges the specified power storage device in priority to charging the other power storage devices; and a basic charging order setting unit that, if the priority request acceptance unit has not received the request or if the priority charging approval unit has not given approval, sets the order of charging the plurality of power storage devices to the order in which the power storage devices were connected to the charging stand.

[0010] In the present invention, the request received by the priority request receiving unit is a request to prioritize charging of a subsequent power storage device that is second or later among the multiple power storage devices when connected to the charging stand over charging of a preceding power storage device that was connected to the charging stand before the subsequent power storage device, and the request notification unit may be configured to make the notification to the preceding power storage device.

[0011] In the present invention, the controller may further include an information acquisition unit that acquires information about the storage devices, and a request condition determination unit that determines permission conditions that enable the request to prioritize charging, and the basic charging order setting unit may be further configured to set the charging order of the multiple storage devices to the order in which the storage devices were connected to the charging stand when the storage devices about which the information acquisition unit acquired the information do not satisfy the permission conditions.

[0012] In the present invention, the controller may further include a continuous charging instruction unit that continues charging the other storage devices at a lower power than the charging power of the specified storage device while the specified storage device is being charged with priority. [Effects of the Invention]

[0013] According to the present invention, when multiple power storage devices are connected to a charging station, the multiple power storage devices are charged in a so-called basic charging order in which they are connected to the charging station. In contrast, a request to prioritize charging one of the power storage devices over other power storage devices can be manually made by an owner of one of the power storage devices, a passenger in a vehicle equipped with the power storage device, or the like. When the request is accepted, a notice of the request is issued. This notice may be simply displayed on the charging station or may be directed to a specific person, such as the owner of another power storage device connected at the same time. When an approval operation is performed based on the notice, the priority charging instruction unit instructs the specific power storage device to be charged in priority over the other power storage devices. As a result, even if the power storage devices are charged in an order different from the so-called basic order and charging is completed in an order different from the order in which they were connected to the charging station, charging is completed in the order understood by the person who manually made the request or approval. This avoids or suppresses suspicions about malfunctions or abnormalities in the charging station or the power storage devices, and discomfort such as disappointing charging completion timing. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a block diagram schematically illustrating a configuration of an embodiment of the present invention. [Figure 2] FIG. 2 is a block diagram showing the functional configuration of the controller. [Figure 3] 4 is a flowchart illustrating an example of control performed in an embodiment of the present invention. [Figure 4] 10 is a flowchart illustrating another example of control performed in the embodiment of the present invention. [Figure 5]10 is a flowchart illustrating yet another example of control performed in the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] Next, an embodiment of the present invention will be described with reference to the accompanying drawings. Note that the embodiment described below is merely an example of how the present invention can be implemented, and is not intended to limit the present invention.

[0016] A charging system according to an embodiment supplies external power from a charging stand (sometimes referred to as a charging station) to a power storage device to charge the power storage device. FIG. 1 conceptually illustrates an example of a charging system. The charging stand 1 is equipped with a predetermined power source and includes multiple (e.g., two) charging cables 2a, 2b and connectors 3a, 3b attached to the ends of the cables. In the example illustrated in FIG. 1, the power storage devices are power storage devices 5a, 5b, mainly consisting of secondary batteries, mounted on electric vehicles 4a, 4b such as BEVs or PHEVs. By connecting the connectors 3a, 3b to sockets (not shown) provided on the electric vehicles 4a, 4b, the charging stand 1 is connected to the power storage devices 5a, 5b, and charging is performed.

[0017] The charging stand 1 includes a controller 6 and is configured to acquire information about the power storage devices 5a, 5b, such as the SOC and battery temperature of the power storage devices 5a, 5b, when the electric vehicles 4a, 4b are connected via the charging cables 2a, 2b. This information is used to calculate whether charging is possible, the charging power, the charging time, and other information, and charging is performed according to the results of calculations based on the information. Furthermore, the charging time, the charging progress, or the completion of charging are communicated to the electric vehicles 4a, 4b or their passengers as needed. Information may be communicated to the passengers via mobile terminals 7a, 7b, such as smartphones, smartwatches, laptop PCs, or tablet devices, or directly to the electric vehicles 4a, 4b using a navigation system or a Vehicle Information Communication System (VICS). These functions may be similar to those provided in conventionally known charging stands.

[0018] The charging stand 1 is equipped with a communication device 8 for transmitting and receiving data to and from remote devices such as mobile terminals 7a and 7b. The communication device 8 includes a communication interface and communicates data with the mobile terminals 7a and 7b via short-range communication such as the Internet, a wireless local area network (LAN), near field communication (NFC), or Bluetooth (registered trademark). Depending on the content of the data to be transmitted and received, the communication device 8 may be configured to communicate with only one of the mobile terminals 7a (or 7b). The mobile terminals 7a and 7b are equipped with an application that acquires information related to the control of receiving power from the charging stand 1 and charging the power storage devices 5a and 5b, and issues instructions related to charging. The application can display the charging status transmitted from the charging stand 1, receive and display requests for prioritized charging (described later), and transmit approval or denial of the requests.

[0019] The controller 6 is mainly configured with a microcomputer including a calculation unit (CPU), memory devices (RAM, ROM), and various interfaces (I / F), and is configured to perform calculations according to a predetermined program using data input from outside or pre-stored data, and to output the results of the calculations as control command signals. The basic control is to start and end charging, count the charging power, and the time required for charging when a charging request is made by inserting any of the connectors 3a, 3b into the connector of any of the electric vehicles 4a, 4b. In this embodiment of the present invention, the controller 6 is further configured to perform control when multiple power storage devices 5a, 5b are connected to the charging stand 1.

[0020] 2 is a block diagram showing the configuration of the controller 6 for performing so-called simultaneous charging control when charging multiple power storage devices 5a, 5b. The controller 6 has a simultaneous charging determination unit 6a. The simultaneous charging determination unit 6a determines whether multiple power storage devices 5a, 5b are connected to the charging stand 1. This determination can be made, for example, by providing sensors (not shown) in each of the connectors 3a, 3b and based on the detection signals output by the multiple sensors.

[0021] The controller 6 includes a priority request receiving unit 6b. When multiple power storage devices 5a, 5b are connected to the charging stand 1, a request for priority charging, i.e., a priority request, can be made. This priority request can be made by the passenger of the electric vehicle 4a, 4b on which the power storage devices 5a, 5b are mounted, for example, by manually operating the passenger's mobile terminal 7a, 7b. To enable the passenger to make this priority request, the passenger of the electric vehicle 4a, 4b on which the power storage devices 5a, 5b are mounted is notified that multiple power storage devices 5a, 5b are connected to the charging stand 1. This notification can be sent to the passenger together with information related to charging, such as the start and end of charging and the charging time. Furthermore, the electric vehicles 4a, 4b or their occupants who are notified that a priority request for priority charging is possible may be limited to the electric vehicles 4a, 4b or their occupants that are equipped with the power storage devices 5a, 5b that are second or later in the connected order (which may be referred to as the subsequent power storage device) among the power storage devices 5a, 5b that are connected simultaneously.

[0022] Conditions can be set for accepting a priority request. That is, a priority request is a request to complete charging earlier than the other power storage devices 5a, 5b. However, if the charging takes a long time, the overall charging efficiency of the charging station 1 will decrease, and the patience or burden of the passengers of the electric vehicles 4a, 4b equipped with the postponed power storage devices 5a, 5b (sometimes referred to as "priority power storage devices") will increase. To avoid such inconveniences, restrictions can be set for accepting priority requests. The conditions can be, for example, that the electric vehicles 4a, 4b making the priority request are equipped with ultra-fast chargers with a high voltage of several hundred volts, or that the temperature of the power storage devices 5a, 5b is below a predetermined upper temperature limit. The controller 6 is provided with a request condition determination unit 6c that determines whether such conditions are met.

[0023] The controller 6 is provided with a request notification unit 6d that notifies the user that a priority request has been accepted. This notification may be sent to the electric vehicles 4a and 4b, or to the mobile terminals 7a and 7b of the passengers of the electric vehicles.

[0024] The controller 6 is provided with a priority charging approval unit 6e that approves the received priority request and approves priority charging. The approval is made based on approval by an approval authority. The approval authority is essentially a person who connected the power storage devices 5a, 5b to the charging stand 1 before the person who made the priority request, and who has been notified by the controller 6 of the priority request. The approval can be made, for example, by manually operating the mobile terminals 7a, 7b described above. The priority charging approval unit 6e approves priority charging by acquiring data based on the manual approval operation of the mobile terminals 7a, 7b.

[0025] The controller 6 is provided with a priority charging instruction unit 6f that instructs to perform priority charging based on the received priority request. Priority charging is, for example, control to temporarily stop charging of the preceding power storage device 5b (or 5a) other than the subsequent power storage device 5a (or 5b) for which a priority request has been made and to prioritize charging of the subsequent power storage device 5a (or 5b) for which a priority request has been made, or control to make the charging power for the power storage device 5a (or 5b) for which a priority request has been made higher than the charging power for the other preceding power storage device 5b (or 5a).

[0026] It is preferable to continue charging the preceding power storage devices 5a, 5b, which were connected to the charging stand 1 first but whose charging was postponed, even while the above-mentioned priority charging is being performed. This is to maintain the coolant temperature at a predetermined temperature when the power storage devices 5a, 5b are water-cooled. Therefore, the charging power is set to a low value determined by experiment, simulation, or the like as the power required to keep the coolant warm. A continuous charging instruction unit 6g that instructs such so-called continuous charging is provided in the controller 6.

[0027] The controller 6 is provided with a basic charging order setting unit 6h that controls so-called simultaneous charging when there is no priority request. The basic charging order when multiple power storage devices 5a, 5b are connected to the charging stand 1 is the connection order to the charging stand 1, and the basic charging order setting unit 6h sets the charging order of the multiple power storage devices 5a, 5b that are simultaneously connected to the charging stand 1 to the connection order to the charging stand 1.

[0028] As described above, the charging order of the multiple power storage devices 5a, 5b connected simultaneously is determined based on external information such as whether or not there is a priority request, whether or not there is approval, the charge capacities and temperatures of the power storage devices 5a, 5b, etc. The controller 6 is provided with an information acquisition unit 6i that acquires such external information.

[0029] An example of control by the controller 6 will now be described with reference to a flowchart. Fig. 3 is a flowchart for explaining a first control example, in which first, in step S1, it is determined whether the number of vehicles to be charged is two or more. Here, vehicles to be charged refer to electric vehicles 4a, 4b connected to the charging station 1, and in step S1, it is determined whether multiple vehicles are connected. The function that makes this determination in step S1 is the function of the simultaneous charging determination unit 6a described above.

[0030] If the result of the determination in step S1 is "Yes," then in step S2 it is determined whether or not there is a request for priority charging as described above. A priority request is normally made by the electric vehicles 4a, 4b that connected to the charging stand 1 second or later (i.e., the following vehicles), and in the example shown in FIG. 1 described above, this is made by manually operating the mobile terminals 7a, 7b. If there is a priority request, that is, if the priority request is accepted by the priority request acceptance unit 6b described above, then the result of the determination in step S2 is "Yes."

[0031] If the priority request is accepted and the result of the determination in step S2 is "YES," the process proceeds to step S3, where the request notification unit 6d notifies the user that a priority request has been made. This notification is basically made to the electric vehicles 4a, 4b that made the priority request, i.e., the so-called preceding vehicle that connected to the charging stand 1 first, or to the user of the preceding vehicle. The notification is made, for example, by displaying a monitor (not shown) mounted on the electric vehicles 4a, 4b or a mobile terminal 7a, 7b held by the user. Note that the notification may also be made to the user who made the priority request to inform them that the priority request has been accepted.

[0032] In the following step S4, it is determined whether the priority request has been approved. The person with the authority to approve the request is the person who connected the leading vehicle to the charging station 1, such as the passenger or owner of the following vehicle. The person with the authority has been notified of the priority request, and in response to the notification, for example, the person manually operates (touches) the mobile terminal 7a, 7b or an icon displayed on an in-vehicle touch panel (not shown), thereby inputting an approval signal to the controller 6.

[0033] The approval signal is received by the priority charge approval unit 6e described above, and if the result of the determination in step S4 is "YES" based on that, charging based on the priority request, i.e., priority charging, is instructed in step S5. The function of this step S5 is the function of the priority charge instruction unit 6f described above. After executing the control in step S5, the series of routines shown in FIG. 3 are temporarily ended.

[0034] Priority charging is essentially a control that completes charging of the power storage devices 5a, 5b of a following vehicle that has made a priority request before charging of the power storage devices 5a, 5b of a preceding vehicle. Various charging methods are possible, and for example, charging of the preceding vehicle may be temporarily stopped and charging of the following vehicle may be performed. Alternatively, the charging power of the preceding vehicle may be reduced and the charging power of the following vehicle may be increased. Furthermore, charging of the preceding vehicle and charging of the following vehicle may be alternately performed, with the charging power of the following vehicle being increased or the charging time per charging may be extended.

[0035] Note that if the determination result in step S2 is "NO" because there is no priority request described above even though multiple power storage devices 5a, 5b are connected to the charging stand 1, or if the determination result in step S4 is "NO" because the priority request is not approved, the process proceeds to step S6, where each power storage device 5a, 5b is charged in the basic charging order, and then the routine of FIG. 3 is temporarily terminated. Here, the basic charging order refers to the order in which the power storage devices 5a, 5b are connected to the charging stand 1, and the power storage device 5a, 5b connected first to the charging stand 1 is charged and completed before the other power storage devices 5a, 5b. In this case, even if the SOC of the power storage devices 5a, 5b of the following electric vehicles 4a, 4b is high and reaches full charge in a short time, the charging of the power storage devices 5a, 5b of the preceding electric vehicles 4a, 4b may be completed first. The function of step S6 is the function of the basic charging order setting unit 6h described above.

[0036] If the result of the determination in step S1 is "NO" because only one electric vehicle 4a, 4b (or one power storage device 5a, 5b) is connected to the charging stand 1, the routine in Fig. 3 is temporarily terminated without any particular control being performed. In other words, charging is performed without any control being performed to determine the charging order.

[0037] Therefore, according to the charging system of the above embodiment, the priority order for charging power storage devices 5a, 5b connected to charging stand 1 is the order agreed upon by the parties involved in the simultaneous charging. In other words, there is no delay in the completion of charging against the will of the parties involved, and it is possible to prevent doubts or discomfort such as charging abnormalities or equipment failures based on the timing of charging completion.

[0038] Another control example that can be executed in an embodiment of the present invention will be described with reference to the flowchart shown in FIG. 4. The control example shown in FIG. 4 is an example in which a condition is set for issuing a request for preferential charging or for accepting a priority request. Therefore, the routine shown in FIG. 4 includes step S11 for determining whether a priority request permission condition is met, and the other control steps are similar to those of the control example shown in FIG. 3. That is, in FIG. 4, if the result of the determination in step S1 is "Yes," the process proceeds to step S11, where the request condition determination unit 6c determines whether the priority request permission condition is met. The priority request permission condition is basically a condition in which the time required to complete charging is expected to be shorter than the charging time required for the other power storage devices 5a and 5b simultaneously connected to the charging stand 1. Examples of such conditions include the possibility of ultra-rapid charging at several hundred volts and the fact that the SOC is already high enough to reach full charge in a short time. Conversely, the priority request permission condition can also be that the temperature of the power storage devices 5a and 5b is not excessively high, thereby limiting charging.

[0039] If the determination result in step S11 is "YES", the process proceeds to step S2 described above, and the control of steps S2 to S5 is executed. Conversely, if the determination result in step S11 is "NO", the priority request is not accepted, or charging based on the priority request is not performed, and the process proceeds to step S6 described above.

[0040] Therefore, according to the control example shown in FIG. 4, it is possible to avoid or suppress the occurrence of a situation contrary to the situation assumed in the case of preferential charging, such as a situation where preferential charging takes a long time.

[0041] Furthermore, the control example shown in FIG. 5 is an example in which measures are taken for the electric vehicles (preceding vehicles) 4a, 4b or the power storage devices (preceding power storage devices) 5a, 5b whose charging is postponed. In other words, if the charging station 1 has the capacity to simultaneously charge multiple power storage devices 5a, 5b, there is no particular factor that restricts the charging of the other power storage devices 5a, 5b while one of the power storage devices 5a, 5b is being charged with priority. Therefore, the other power storage devices 5a, 5b can be charged to the extent that so-called priority charging is not hindered. Therefore, in the control example shown in FIG. 5, limited charging of the postponed vehicle is taken as a measure for charging the power storage devices 5a, 5b whose charging is postponed. This control can be performed by the continuous charging instruction unit 6g described above.

[0042] Specifically, the control example shown in Fig. 5 is an example in which step S41 of instructing restricted charging of the postponed vehicle is added to the control example shown in Fig. 3, and therefore the control steps other than step S41 are the same as those in the control example shown in Fig. 3. That is, in the control example shown in Fig. 5, if the priority request is approved and the result of the determination in step S4 is "yes," restricted charging of the postponed vehicle is performed in step S41, and then the process proceeds to step S5.

[0043] Here, limited charging of a postponed vehicle refers to charging for a longer period of time than charging alone, such as charging with low charging power or intermittent charging with long intervals, without completely stopping charging of the electric vehicles 4a, 4b whose charging order (or charging completion order) has been delayed due to the approval of a priority request. In particular, charging that supplies enough power to maintain the temperature of the cooling water, etc. of the power storage devices 5a, 5b due to heat generated during charging is preferable. This avoids inconveniences such as a drop in temperature or a drop in SOC in the power storage devices 5a, 5b, whose charging is limited due to charging in response to a priority request, and also reduces the load on the power cycle.

[0044] The present invention is not limited to the above-described embodiment. The number of power storage devices that can be simultaneously connected to a charging station may be three or more, as long as it is more than one. In the case of three or more devices, a configuration may be adopted in which multiple priority requests are accepted and the charging order for the multiple devices is determined collectively. The charging station may be either a type that charges power storage devices using AC or a type that charges power storage devices using DC. Furthermore, the priority request may be made manually, and the priority request may be made and approved by a switch provided on the charging station, in addition to a mobile terminal or an in-vehicle touch panel. Notification of a priority request may be similarly made by displaying a message on the charging station. Furthermore, the permission conditions for requesting priority charging in the present invention may be appropriately set as needed. Furthermore, the controller in the present invention may be configured as cloud computing using an external server, rather than being provided at the charging station. [Explanation of symbols]

[0045] 1 charging stand 2a, 2b charging cable 3a,3b connector 4a, 4b Electric vehicles 5a,5b Power storage device 6 Controller 6a Simultaneous charge determination section 6b Priority Request Reception Unit 6c Requirement condition determination section 6d Request Notification Department 6e Priority Charging Approval Department 6f Priority charging instruction section 6g Continuous charging indicator 6h Basic charging order setting section 6i Information acquisition section 7a, 7b Mobile terminal 8. Communications Equipment

Claims

1. A charging system that supplies external electric power to a plurality of power storage devices via a charging stand to which the power storage devices are connected, thereby charging the power storage devices, a controller that determines a charging sequence for the plurality of power storage devices connected to the charging station; The controller a simultaneous charging determination unit that determines whether a plurality of the power storage devices are connected to the charging stand; a priority request receiving unit that receives a request made by a human operation to charge a predetermined power storage device among the plurality of power storage devices in priority to other power storage devices; a request notification unit that notifies the user that the request has been made; a priority charging approval unit that approves, based on a human operation, the preferential charging of the predetermined power storage device based on the request; a priority charging instruction unit that, when the priority charging approval unit has given the approval, charges the specified power storage device with priority over charging the other power storage devices; a basic charging order setting unit that sets the order of charging of the plurality of power storage devices to the order in which the power storage devices are connected to the charging stand when no request is received by the priority request receiving unit and when no approval is given by the priority charging approval unit; A charging system comprising:

2. 2. The charging system according to claim 1, the request received by the priority request reception unit is a request to prioritize charging of a subsequent power storage device that is second or later in order of connection to the charging stand among the plurality of power storage devices over charging of a preceding power storage device that was connected to the charging stand earlier than the subsequent power storage device, The request notification unit is configured to issue the notification to the preceding power storage device. A charging system characterized by:

3. 3. The charging system according to claim 1, The controller further comprises: an information acquisition unit that acquires information about the power storage device; a request condition determination unit that determines permission conditions that enable the request to perform charging with priority; The basic charging order setting unit is further configured to, when the power storage device for which the information has been acquired by the information acquisition unit does not satisfy the permission condition, set the charging order of the plurality of power storage devices to the order in which the power storage devices were connected to the charging stand. A charging system characterized by:

4. 4. The charging system according to claim 3, The controller further comprises: and a continuous charging instruction unit that continues charging the other power storage devices at a power lower than the charging power of the predetermined power storage device while the predetermined power storage device is being charged with priority. A charging system characterized by:

5. 3. The charging system according to claim 1, The controller further comprises: and a continuous charging instruction unit that continues charging the other power storage devices at a power lower than the charging power of the predetermined power storage device while the predetermined power storage device is being charged with priority. A charging system characterized by:

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