Battery temperature regulation system

Abstract

A battery temperature regulating system capable of properly suppressing battery deterioration is provided. A battery temperature regulating system (1) is provided with: a battery (2) capable of storing electric power from an external power source (10) and supplying electric power to a motor (7); a cooling device (3) selectively supplied with electric power from the external power source (10) and electric power from the battery (2) and cooling the battery (2); and a control device (5) controlling the cooling device (3) to regulate a state of charge and a battery temperature of the battery (2). The control device (5) stores a deterioration sensitivity map in which a deterioration sensitivity is preset in accordance with the state of charge and the battery temperature, or is capable of calculating the deterioration sensitivity in accordance with the state of charge and the battery temperature. When a vehicle (V) is connected to the external power source, the control device (5) operates the cooling device (3) in accordance with the deterioration sensitivity, selecting either electric power from the battery (2) or electric power from the external power source (10).

Description

TECHNICAL FIELD

[0001] The present application relates to a battery temperature adjustment system that adjusts the temperature of a battery mounted on an electric vehicle or the like. BACKGROUND

[0002] In recent years, as a specific countermeasure against climate change of the Earth, efforts to realize a low-carbon society or a decarbonized society are becoming active. Also, for vehicles, reduction of CO2 emissions is strongly demanded, and electrification of drive sources is rapidly progressing. Specifically, development of vehicles such as an electrical vehicle (EV) or a hybrid electrical vehicle (HEV) that have the following components is being promoted: an electric motor as a drive source of the vehicle; and a battery as a secondary battery that can supply electric power to the electric motor.

[0003] Generally, a battery deteriorates in a high-temperature and high-SOC (State Of Charge) state. Patent Literature 1 discloses a battery control device that, in order to suppress deterioration of a battery, prevents the battery from being in a high-temperature and high-SOC state during a system stop of a vehicle. Specifically, the battery control device of Patent Literature 1 operates an auxiliary machine (for example, a battery cooling fan) of the vehicle to discharge the battery when the number of times of detection of the battery being in a high-temperature and high-SOC state per a prescribed time reaches a prescribed number of times or more.

[0004] Further, conventionally, in a state where the vehicle is connected to an external power source (that is, in a plugged-in state), a cooling device that cools the battery is configured to be operated using electric power from the external power source.

[0005] PRIOR ART DOCUMENTS

[0006] PATENT LITERATURE

[0007] Patent Literature 1: Japanese Patent Application Publication No. 2015-037011

[0008] However, in order to suppress deterioration of a battery in a high-temperature and high-SOC state, it can not always be advantageous to cool the battery using electric power from an external power source. SUMMARY

[0009] The present application provides a battery temperature adjustment system that can appropriately suppress deterioration of a battery.

[0010] The battery temperature adjustment system of the present application has:

[0011] a battery that can store electric power from an external power source and supply electric power to a motor as a drive source of a vehicle;

[0012] a cooling device that is selectively supplied with electric power from the external power supply and electric power from the battery and cools the battery; and

[0013] a control device that controls the cooling device to adjust a state of charge and a battery temperature of the battery,

[0014] wherein the control device

[0015] a deterioration sensitivity map in which a deterioration sensitivity is preset in accordance with the state of charge and the battery temperature, or is able to calculate a deterioration sensitivity in accordance with the state of charge and the battery temperature,

[0016] selects none of the electric power from the battery and the electric power from the external power supply to operate the cooling device in accordance with the deterioration sensitivity when the vehicle is connected to the external power supply.

[0017] According to the present application, it is possible to appropriately suppress deterioration of a battery. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic view showing a vehicle V equipped with a battery temperature adjustment system 1 of the present application.

[0019] Figure 2 is a block diagram showing the structure of the battery temperature adjustment system 1 of the present application.

[0020] Figure 3 is a graph showing a case where a deterioration sensitivity X2 at a second estimated value is lower than a deterioration sensitivity Xl at a first estimated value in a deterioration sensitivity map showing the deterioration sensitivity of a battery 2 in accordance with a battery temperature and an SOC.

[0021] Figure 4 is a graph showing a case where a deterioration sensitivity Xl at a first estimated value is lower than a deterioration sensitivity X2 at a second estimated value in a deterioration sensitivity map showing the deterioration sensitivity of a battery 2 in accordance with a battery temperature and an SOC.

[0022] Figure 5 is a graph showing a control flow executed by a control device 5.

[0023] Figure 6 is a graph showing a case where a deterioration sensitivity Xl is the lowest among deterioration sensitivities Xl to X3 in a deterioration sensitivity map showing the deterioration sensitivity of a battery 2 in accordance with a battery temperature and an SOC.

[0024] --BRIEF DESCRIPTION OF THE DRAWINGS--

[0025] 1 battery temperature adjustment system

[0026] 2 battery

[0027] 3 Cooling device

[0028] 5 Control devices

[0029] 7 motors

[0030] V vehicle Detailed Implementation

[0031] A battery temperature regulation system according to an embodiment of the present invention will now be described with reference to the accompanying drawings.

[0032] [vehicle]

[0033] like Figure 1 and Figure 2 As shown, the battery temperature regulation system 1 of this embodiment is mounted on a vehicle V. The vehicle V is, for example, an electric vehicle such as a plug-in hybrid electric vehicle or an electric vehicle, and is configured to charge the battery 2 using power from an external power source 10 located at a charging station, home, etc. The vehicle V is configured to drive a motor 7, which serves as a drive source, using the power stored in the battery 2.

[0034] The vehicle V is connected (inserted) to the external power source 10 by connecting the charging plug 11a of the charging cable 11 extending from the external power source 10 to the charging port 8 provided in the vehicle V. It should be noted that the connection between the vehicle V and the external power source 10 is not limited to this. For example, the vehicle V may be equipped with a receiving coil or the like that is capable of receiving power transmitted from the external power source 10 in a non-contact manner.

[0035] The vehicle V is configured to communicate with a user terminal 20 held by the user. The user terminal 20 may be, for example, a smartphone or tablet that the user can carry, or a navigation device installed on the vehicle V. The user can set an upper limit for the State of Charge (SOC) of the battery 2 on the user terminal 20, and the set SOC upper limit is stored in the battery control unit 5a described later. For example, when the user desires a higher SOC to increase the driving range of the vehicle V, the upper limit of the SOC can be preset to be higher.

[0036] [Battery Temperature Regulation System]

[0037] The battery temperature regulation system 1 includes a battery 2, a cooling device 3 for cooling the battery 2, a sensor unit 4 for detecting the state of the battery 2, and a control device 5 for controlling the cooling device 3.

[0038] The battery 2 is configured by stacking a plurality of battery cells (not shown), for example, a lithium ion battery, a nickel-hydrogen battery. The battery 2 is connected to the external power supply 10 by connecting the charging plug 11a to the charging inlet 8, and is configured to be able to store electric power from the external power supply 10. The electric power stored in the battery 2 is converted from direct current to alternating current via an inverter included in the electric power conversion device 6, and is supplied to the motor 7. Further, if alternating current generated by the motor 7 when the vehicle V is braked is input to the electric power conversion device 6, the alternating current is converted to direct current via the inverter and is supplied to the battery 2. That is, the battery 2 is configured to be able to store regenerative electric power.

[0039] The cooling device 3 cools the battery 2 by causing a refrigerant to flow in a refrigerant flow path provided in the battery 2. The cooling device 3 is, for example, a water-cooled type, circulates the refrigerant by a pump, and cools the refrigerant by a radiator. Note that a heater is provided on the cooling device 3, so that the battery 2 can also be heated.

[0040] The cooling device 3 is supplied with electric power stored in the battery 2. Further, the cooling device 3 is configured to be supplied with electric power from the external power supply 10 when the vehicle V is connected to the external power supply 10. Although details will be described later, the cooling device 3 of the present embodiment is configured to be selectively supplied with electric power from the external power supply 10 and electric power from the battery 2 when the vehicle V is connected to the external power supply 10.

[0041] The sensor portion 4 is provided with a temperature sensor 4a that acquires a temperature of the battery 2 (hereinafter also referred to as a battery temperature), a voltage sensor 4b that measures a voltage of the battery 2, and a current sensor 4c that measures a current flowing through the battery 2.

[0042] The control device 5 is configured by a battery control portion 5a that controls charging and discharging of the battery 2, and a cooling control portion 5b that controls the cooling device 3. The control device 5 is realized by, for example, an ECU (Electronic Control Unit) provided with a processor, a memory, an interface, and the like. Note that the battery control portion 5a and the cooling control portion 5b can each be configured by an independent control device.

[0043] The battery temperature, the voltage of the battery 2, and the current of the battery 2, and the like are input from the sensor portion 4 to the battery control portion 5a. Further, the battery control portion 5a calculates the SOC of the battery 2 using the input voltage and current. The battery control portion 5a controls charging and discharging of the battery 2 based on these input values and the SOC.

[0044] The battery control portion 5a stores a deterioration sensitivity map (refer to FIG. 2) in which the deterioration sensitivity of the battery 2 is set in advance in accordance with the SOC and the battery temperature in a memory or the like. Details of the deterioration sensitivity and the deterioration sensitivity map will be described later. Figure 3 and Figure 4 ) in a memory or the like. Details of the deterioration sensitivity and the deterioration sensitivity map will be described later.

[0045] The cooling control section 5b operates the cooling device 3 to bring the battery temperature within the prescribed temperature range. In addition to operating the cooling device 3 during travel of the vehicle V, the cooling control section 5b operates the cooling device 3 to maintain the battery temperature within the prescribed temperature range when the battery temperature is higher than the prescribed temperature range during stop of the vehicle V. The operation of the cooling device 3 when the battery temperature is higher than the prescribed temperature range during stop of the vehicle V corresponds, for example, to when the vehicle V is parked in a high-temperature environment for a certain period of time.

[0046] The conventional cooling device is configured to operate using electric power supplied from an external power source when the vehicle is connected to the external power source, and not to consume electric power of the battery during the cooling process. On the other hand, the cooling device 3 of the present embodiment is configured to select electric power from the external power source 10 or electric power from the battery 2 based on the deterioration sensitivity even when the vehicle V is connected to the external power source 10, and to operate using the selected electric power.

[0047] The deterioration sensitivity indicates how easily the deterioration of the battery 2 progresses per unit time. The higher the deterioration sensitivity, the more easily the deterioration progresses per unit time, and the lower the deterioration sensitivity, the more difficultly the deterioration progresses per unit time. The deterioration sensitivity can be set in accordance with the state of charge of the battery 2 and the battery temperature. The deterioration sensitivity can be obtained from a deterioration sensitivity map in which deterioration sensitivities are plotted in advance. Further, the deterioration sensitivity can also be sequentially calculated in accordance with a preset formula or the like. In the following description, the control of cooling the battery 2 will be described taking the case where the deterioration sensitivity is obtained from the deterioration sensitivity map as an example.

[0048] [Deterioration Sensitivity Map]

[0049] Reference will be made to Figure 3 and Figure 4 The deterioration sensitivity map of the battery 2 stored in the battery control section 5a will be described. Note that, Figure 3 and Figure 4 The deterioration sensitivity map shown in Figs. 17 and 18 is merely an example, and the deterioration sensitivity map varies depending on the battery used.

[0050] In the deterioration sensitivity map, the battery temperature T is taken as the horizontal axis, and the SOC is taken as the vertical axis, and the deterioration sensitivity preset in accordance with the battery temperature and the SOC value is shown. The battery temperature T increases as it goes to the right of the graph, and the SOC increases as it goes to the top of the graph. The deterioration sensitivity takes a value between 0 and 1, and the lower the deterioration sensitivity, the more difficultly the deterioration of the battery 2 progresses per unit time, that is, the higher the deterioration suppression effect of the battery 2.

[0051] Figure 3 and Figure 4A state in which the battery 2 is in a high temperature and high SOC state at the current time point (TO, SOC0) is shown. Here, the high temperature means that the temperature of the battery 2 is higher than a prescribed temperature range (for example, around 40°C), and the high SOC means that the SOC of the battery 2 is higher than a prescribed SOC range (for example, around 80%). The current deterioration sensitivity X0 is high (i.e., easy to deteriorate).

[0052] When the vehicle V is connected to the external power source 10, the battery control section 5a estimates the estimated values of the battery temperature and SOC after cooling (T1, SOC1) when the cooling device 3 is operated using the electric power from the external power source 10. In this case, since the electric power of the battery 2 is not consumed during the cooling, the SOC1 is the same as the current SOC0. Further, the battery control section 5a estimates the estimated values of the battery temperature and SOC after cooling (T2, SOC2) when the cooling device 3 is operated using the electric power from the battery 2. In this case, the electric power of the battery 2 is consumed during the cooling, and thus the SOC2 is lower than the current SOC0. Note that in the present embodiment, it is assumed that the estimated value of the battery temperature is the same value at T1 and T2.

[0053] In Figure 3 , the deterioration sensitivity X2 at the estimated values (T2, SOC2) is lower than the deterioration sensitivity X1 at the estimated values (T1, SOC1). That is, operating the cooling device 3 using the electric power from the battery 2 is more capable of suppressing the deterioration of the battery 2 than operating the cooling device 3 using the electric power from the external power source 10. On the other hand, in Figure 4 , the deterioration sensitivity X1 at the estimated values (T1, SOC1) is lower than the deterioration sensitivity X2 at the estimated values (T2, SOC2). That is, by operating the cooling device 3 using the electric power from the external power source 10 instead of using the electric power from the battery 2, it is possible to suppress the deterioration of the battery 2.

[0054] [Control Flow]

[0055] Next, the control flow of the control device 5 will be described with reference to Figure 5

[0056] In step S100, the battery control section 5a determines whether or not the vehicle V is connected to the external power source 10. If the vehicle V is not connected to the external power source 10 (NO), the process returns to step S100, and the monitoring is continued until the vehicle V is connected to the external power source 10. If the vehicle V is connected to the external power source 10 (YES), the process proceeds to step S102.

[0057] ​In step S102, the battery control section 5a determines whether the battery 2 is in a high-temperature and high-SOC state. Specifically, it is determined whether the battery temperature is higher than a prescribed temperature range and the SOC is higher than a prescribed SOC range. If the battery 2 is not in a high-temperature and high-SOC state (NO), the control routine of the present embodiment ends. If the battery 2 is in a high-temperature and high-SOC state (YES), it proceeds to step S104.

[0058] In step S104, the battery control section 5a estimates the estimated values of the battery temperature and SOC after cooling (T1, SOC1) when the cooling device 3 is operated using the electric power from the external power source 10 and the estimated values of the battery temperature and SOC after cooling (T2, SOC2) when the cooling device 3 is operated using the electric power from the battery 2. Here, the estimated values (T1, SOC1) correspond to the "first estimated values" in the present application, and the estimated values (T2, SOC2) correspond to the "second estimated values" in the present application.

[0059] Next, in step S106, the battery control section 5a refers to the deterioration sensitivity map to acquire the deterioration sensitivity X1 at the estimated values (T1, SOC1) and the deterioration sensitivity X2 at the estimated values (T2, SOC2), and proceeds to step S108.

[0060] In step S108, the battery control section 5a compares the deterioration sensitivity X1 and the deterioration sensitivity X2. For example, as shown in FIG. 6, when the deterioration sensitivity X2 is lower than the deterioration sensitivity X1, that is, when the deterioration suppression effect when the cooling device 3 is operated using the electric power from the battery 2 is higher than the deterioration suppression effect when the cooling device 3 is operated using the electric power from the external power source 10 (YES), it proceeds to step S110. On the other hand, for example, as shown in FIG. 7, when the deterioration sensitivity X2 is equal to or higher than the deterioration sensitivity X1, it proceeds to step S116. Figure 3 Figure 4 In step S116, the battery control section 5a sends an instruction to operate the cooling device 3 using the electric power from the external power source 10 to the cooling control section 5b. The cooling control section 5b operates the cooling device 3 using the electric power from the external power source 10, and the control routine of the present embodiment ends. Note that in step S108, if the deterioration sensitivity X1 and the deterioration sensitivity X2 are equal, it can proceed to step S110 instead of step S116.

[0061] ​In step S110, the battery control section 5a proposes to the user terminal 20 that the cooling device 3 be operated using the electric power from the battery 2 by lowering the upper limit of the SOC set by the user. By proposing this to the user, it is possible to prevent the upper limit of the SOC of the battery 2 from being lowered without the user noticing, and thus to prevent the SOC from dropping. Note that the lowering of the upper limit of the SOC can be temporary, or can continue until the user re-sets the upper limit of the SOC. After proposing the above to the user terminal 20, the process proceeds to step S112.

[0062] In step S112, the battery control section 5a determines whether the user accepts the above proposal. If the user does not accept the above proposal (NO), the process proceeds to the aforementioned step S116, and the battery control section 5a sends an instruction to the cooling control section 5b to operate the cooling device 3 using the electric power from the external power source 10. The cooling control section 5b operates the cooling device 3 using the electric power from the external power source 10, and the control routine of the present embodiment ends. In this way, it is possible to select the power source for the cooling device with respect for the user's wishes. On the other hand, if the user accepts the above proposal (YES), the process proceeds to step S114.

[0063] In step S114, the battery control section 5a lowers the upper limit of the SOC of the battery 2 to allow the electric power of the battery 2 to be consumed during cooling (i.e., to lower the SOC of the battery 2). Then, the battery control section 5a sends an instruction to the cooling control section 5b to operate the cooling device 3 using the electric power from the battery 2. The cooling control section 5b operates the cooling device 3 using the electric power from the battery 2, and the control routine of the present embodiment ends.

[0064] As described above, according to the present embodiment, when the vehicle V is connected to the external power source 10, the deterioration sensitivity Xl and the deterioration sensitivity X2 are compared and the electric power from the battery 2 or the electric power from the external power source 10 is selected to operate the cooling device 3. In this way, by taking the deterioration sensitivity into account in the selection of the power source for the cooling device 3, it is possible to appropriately suppress the deterioration of the battery 2.

[0065] Further, since the lowering of the upper limit of the SOC of the battery 2 to cool the battery 2 is permitted only when the user's permission is obtained, it is possible to prevent the upper limit of the SOC of the battery 2 from being lowered without the user noticing.

[0066] Although in the above-described embodiment the case where the SOC of the battery 2 is maintained and the case where the SOC of the battery 2 is lowered have been described, it is also possible to store electric power in the battery 2 to increase the SOC while cooling the battery 2 using the electric power from the external power source 10.

[0067] Figure 6 is Figure 3on the basis of the above, a graph showing the estimated values (T3, SOC3) of the cooled battery temperature and the SOC when the cooling device 3 is operated using the electric power from the external power source 10 and the electric power is stored in the battery 2, and the deterioration sensitivity X3 at the estimated values (T3, SOC3) is shown. When the battery temperature is lowered to the prescribed temperature range, the control device 5 can compare the deterioration sensitivities X1 to X3, and acquire the deterioration sensitivity with the highest deterioration suppression effect (X2 in Figure 6 the present embodiment. The control device 5 selects either the electric power from the battery 2 or the electric power from the external power source 10 to operate the cooling device 3 in accordance with the deterioration sensitivity with the highest deterioration suppression effect.

[0068] The above describes one embodiment of the present application with reference to the drawings, but the present application is of course not limited to this embodiment. It is obvious that a person skilled in the art can conceive various modifications or corrections within the scope recited in the claims, and it is understood that these modifications or corrections also belong to the technical scope of the present application. Furthermore, each of the constituent elements in the above-described embodiment can be arbitrarily combined within the scope of the gist of the present application.

[0069] In the above-described embodiment, if the deterioration sensitivity X2 is lower than the deterioration sensitivity X1 in step S108, then step S110 and step S112 are entered, and the user is proposed the suggestion to operate the cooling device 3 using the electric power from the battery 2 by lowering the upper limit of the SOC of the battery 2, but this is not limited thereto. For example, step S110 and step S112 can not be executed, and step S114 can be directly entered, and the control device 5 can operate the cooling device 3 using the electric power from the battery 2.

[0070] In the present specification, at least the following matters are described. Although the corresponding constituent elements and the like in the above-described embodiment are shown as one example in parentheses, this is not limited thereto.

[0071] (1) A battery temperature adjustment system (battery temperature adjustment system 1) including:

[0072] a battery (battery 2) capable of storing electric power from an external power source (external power source 10) and supplying electric power to a motor (motor 7) as a drive source of a vehicle (vehicle V);

[0073] a cooling device (cooling device 3) selectively supplied with electric power from the external power source and electric power from the battery, and cooling the battery; and

[0074] a control device (control device 5) controlling the cooling device to adjust a state of charge and a battery temperature of the battery,

[0075] wherein the control device

[0076] a deterioration sensitivity map in which a deterioration sensitivity is preset in accordance with the state of charge and the battery temperature is stored, or a deterioration sensitivity can be calculated in accordance with the state of charge and the battery temperature,

[0077] when the vehicle is connected to the external power supply, the control device operates the cooling device in accordance with either the electric power from the battery or the electric power from the external power supply in accordance with the deterioration sensitivity.

[0078] According to (1), when the vehicle is connected to the external power supply, the control device operates the cooling device in accordance with either the electric power from the battery or the electric power from the external power supply in accordance with the deterioration sensitivity. Therefore, since the deterioration sensitivity can be taken into account in the selection of the electric power source of the cooling device, the deterioration of the battery can be appropriately suppressed.

[0079] (2) The battery temperature adjustment system according to (1), wherein

[0080] the control device estimates

[0081] a first estimated value (estimated value (T1, SOC1)) of the state of charge and the battery temperature after cooling when the cooling device is operated using the electric power from the external power supply, and

[0082] a second estimated value (estimated value (T2, SOC2)) of the state of charge and the battery temperature after cooling when the cooling device is operated using the electric power from the battery,

[0083] when the vehicle is connected to the external power supply, the control device

[0084] when the deterioration sensitivity at the second estimated value (deterioration sensitivity X2) is lower than the deterioration sensitivity at the first estimated value (deterioration sensitivity X1), the cooling device is operated using the electric power from the battery,

[0085] when the deterioration sensitivity at the first estimated value is lower than the deterioration sensitivity at the second estimated value, the cooling device is operated using the electric power from the external power supply.

[0086] According to (2), by comparing the deterioration sensitivity at the first estimated value and the deterioration sensitivity at the second estimated value and further selecting the electric power source of the cooling device, the deterioration of the battery can be appropriately suppressed.

[0087] (3) The battery temperature adjustment system according to (2), wherein

[0088] when the deterioration sensitivity at the first estimated value is lower than the deterioration sensitivity at the second estimated value, the user is presented with a suggestion to operate the cooling device using electric power from the battery before the cooling device is operated using electric power from the battery.

[0089] According to (3), since the user is presented with a suggestion to operate the cooling device using electric power from the battery before the cooling device is operated using electric power from the battery, it is possible to prevent the SOC from decreasing without the user's attention.

[0090] (4) The battery temperature adjustment system according to (3), wherein

[0091] when the user accepts the suggestion, the control device operates the cooling device using electric power from the battery.

[0092] According to (4), since the control device operates the cooling device using electric power from the battery when the user accepts the suggestion, it is possible to decrease the SOC with the user's permission.

[0093] (5) The battery temperature adjustment system according to (3) or (4), wherein

[0094] when the user does not accept the suggestion, the control device operates the cooling device using electric power from the external power source.

[0095] According to (5), since the control device operates the cooling device using electric power from the external power source when the user does not accept the suggestion, it is possible to select the power source of the cooling device in respect of the user's will.

Claims

1. A battery temperature adjustment system, comprising: a battery that is capable of storing electric power from an external power supply and supplying electric power to a motor that is a drive source of a vehicle; a cooling device that is selectively supplied with electric power from the external power supply and electric power from the battery and cools the battery; and a control device that controls the cooling device to adjust a state of charge and a battery temperature of the battery, wherein the control device stores a deterioration sensitivity map in which a deterioration sensitivity is preset in accordance with the state of charge and the battery temperature, or is capable of calculating a deterioration sensitivity in accordance with the state of charge and the battery temperature, and when the vehicle is connected to the external power supply, operates the cooling device by selecting either the electric power from the battery or the electric power from the external power supply in accordance with the deterioration sensitivity.

2. The battery temperature adjustment system according to claim 1, wherein the control device estimates a first estimated value of the state of charge and the battery temperature after cooling when the cooling device is operated by the electric power from the external power supply, and a second estimated value of the state of charge and the battery temperature after cooling when the cooling device is operated by the electric power from the battery, and when the vehicle is connected to the external power supply, the control device operates the cooling device by the electric power from the battery when the deterioration sensitivity at the second estimated value is lower than the deterioration sensitivity at the first estimated value, and operates the cooling device by the electric power from the external power supply when the deterioration sensitivity at the first estimated value is lower than the deterioration sensitivity at the second estimated value.

3. The battery temperature adjustment system according to claim 2, wherein when the deterioration sensitivity at the first estimated value is lower than the deterioration sensitivity at the second estimated value, a suggestion to operate the cooling device by the electric power from the battery is presented to a user before the cooling device is operated by the electric power from the battery.

4. The battery temperature adjustment system according to claim 3, wherein when the user accepts the suggestion, the control device operates the cooling device by the electric power from the battery.

5. The battery temperature adjustment system according to claim 3 or 4, wherein when the user does not accept the suggestion, the control device operates the cooling device by the electric power from the external power supply. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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