JP2011055575A - Electric vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric vehicle which effectively prevents deterioration of a power accumulation device when the power accumulation device is held in a highly-charged state during parking, no matter when the running vehicle is parked, in the electric vehicle equipped with the power accumulation device for feeding power to a drive unit. <P>SOLUTION: The electric vehicle equipped with the power accumulation device 300 for supplying power to the drive unit 100 includes: a prediction means 310 which predicts transition of an internal temperature of the power accumulation device during parking if the running electric vehicle is parked during traveling; and a setting means 310 which sets an upper limit value of the SOC of the power accumulation device, on the basis of the transition of the internal temperature of the power accumulation device which is predicted by the prediction means. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electric vehicle including a power storage device for supplying electric power to a drive device.

  In an electric vehicle equipped with an electric storage device for supplying electric power to the drive device, when the electric vehicle is parked, the electric storage device provided in the electric vehicle is in a high charge state, and the electric storage device is highly charged during parking. It is known that the deterioration of the power storage device is promoted by being held in the state. In contrast, in such an electric vehicle, when the relative distance between the vehicle position and the destination is detected using a navigation device or the like, and the detected relative distance is equal to or less than a predetermined distance, A technology for controlling input / output power of a power storage device so that the amount of power stored in the power storage device is equal to or less than a predetermined threshold is disclosed (see Patent Document 1).

JP 2007-59088 A

  However, in the above prior art, since the input / output power of the power storage device is controlled only when the relative distance between the vehicle position and the destination is equal to or less than a predetermined distance, for example, the driver changes the schedule. When the vehicle is parked at a point where the relative distance between the vehicle position and the destination is longer than the predetermined distance (when the vehicle is parked at a point away from the destination), In such a case, there is a problem that the power storage device is deteriorated.

  The problem to be solved by the present invention is an electric vehicle equipped with a power storage device for supplying electric power to a drive device, even when the vehicle is parked from a running state at any timing, during parking, An object of the present invention is to provide an electric vehicle capable of effectively preventing deterioration of a power storage device due to the power storage device being held in a high charge state.

  The present invention relates to an electric vehicle equipped with a power storage device for supplying electric power to a drive device, and when the electric vehicle is traveling, the internal temperature of the power storage device during parking is assumed when the traveling state is changed to the parking state. The above problem is solved by setting the upper limit value of the SOC of the power storage device based on the predicted transition of the internal temperature.

  According to the present invention, the transition of the internal temperature of the power storage device is predicted, and the upper limit value of the SOC of the power storage device is set based on the predicted transition of the internal temperature. As a result, it is possible to effectively prevent deterioration of the power storage device due to the power storage device being held in a highly charged state during parking, regardless of the timing when the vehicle is changed from the running state to the parking state. be able to.

FIG. 1 is a diagram illustrating a system configuration of an electric vehicle according to the present embodiment. FIG. 2 is a flowchart showing the SOC upper limit setting process of the power storage device according to the first embodiment. FIG. 3A is a graph showing an example of transition of the internal temperature of the power storage device during parking. 3B is an internal temperature of the power storage device in the parking is a graph showing an example of the case to remain at higher than the predetermined temperature T _0. Figure 3C, the internal temperature of the power storage device in the parking is a graph showing an example of the case to remain at lower than the predetermined temperature T _0. FIG. 3D is a graph illustrating an example of a case where the internal temperature of the power storage device during parking transitions from a state higher than a predetermined temperature T ₀ to a state lower than the predetermined temperature T ₀ . FIG. 4 is a graph illustrating an application example of the SOC upper limit setting process according to the first embodiment. FIG. 5 is a flowchart showing the SOC upper limit setting process of the power storage device according to the second embodiment. FIG. 6 is a flowchart showing the SOC upper limit setting process of the power storage device according to the third embodiment. Figure 7 is a flowchart showing the correction processing of the reference deterioration load L ₀ according to a third embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<< First Embodiment >>
FIG. 1 is a diagram illustrating a system configuration of an electric vehicle according to the present embodiment.
As shown in FIG. 1, the electric vehicle according to the present embodiment includes a drive device 100, a power generation device 200, and a power storage device 300.

  The drive device 100 includes a drive motor 101 and a drive inverter 102, and a command based on the driver's accelerator operation is sent by the drive system control device 110 to the drive inverter 102, so that the driver's A driving force corresponding to the accelerator operation is generated in the driving wheel 500. Specifically, the driving device 100 takes out the electric power generated by the power generation device 200 and / or the electric power stored in the power storage device 300, and uses the extracted electric power via the driving inverter 102 to drive the driving motor 101. Then, after the power is converted by the speed reducer 400 as necessary, the drive wheels 500 are driven. As a result, the electric vehicle travels. The drive system control device 110 includes a ROM that stores a program for controlling the drive device 100, a CPU that executes the program stored in the ROM, and a RAM that serves as a storage device. The apparatus 100 is controlled.

  In drive device 100, when power is regenerated by drive motor 101, the regenerated power is output to power storage device 300 after power conversion is performed by drive inverter 102. .

  The power generation apparatus 200 includes a power generation engine 201, a power generation motor 202, and a power generation inverter 203. The power generation device 200 is configured so that the power generation engine 201 is driven by the fuel based on a command from the power generation system control device 210 so that the power generation motor 202 generates power by the output torque generated by the drive of the power generation engine 201. Thus, the generated power is subjected to power conversion by the power generation inverter 203 and then output to the driving device 100 and / or the power storage device 300. The power generation system control device 210 includes a ROM that stores a program for controlling the power generation device 200, a CPU that executes the program stored in the ROM, and a RAM that serves as a storage device. The apparatus 200 is controlled.

  The power storage device 300 stores the power generated by the power generation device 200 and the regenerative power from the drive device 100. The power storage device 300 is not particularly limited, and includes various secondary batteries such as a lithium ion battery, a nickel hydride battery, and a nickel cadmium battery, but is not particularly limited thereto.

  The power storage device 300 is connected to a power storage system control device 310, and the power storage system control device 310 performs various controls such as power input / output control of the power storage device 300. Specifically, the power storage system control device 310 acquires various data such as the terminal voltage, energization current, internal temperature, internal resistance, storage amount, ambient temperature, and heat dissipation characteristics of the power storage device 300, and based on these, The power storage device 300 is controlled. Note that each of these data may be measured using an output from a sensor (not shown) provided in the power storage device 300, or may be estimated from various measurement results.

  In the present embodiment, when the electric vehicle is immediately parked from the traveling state, the power storage device 300 is prevented from being deteriorated by being held in the high temperature / high SOC state. Therefore, the power storage system control device 310 sets and sets the SOC upper limit value of the power storage device 300 by performing an SOC (State of Charge) upper limit value setting process, which will be described later, based on these data. The upper limit value of the SOC is sent to the drive system control device 110 and the power generation system control device 210. Then, based on the upper limit value of the SOC sent out by power storage device 300, drive system control device 110 controls the output of power regenerated by drive motor 101 to power storage device 300, and power generation system control device 210 controls power generation by the power generation engine 210. In this way, power storage system control device 310 sends the upper limit value of SOC of power storage device 300 to drive system control device 110 and power generation system control device 210, thereby driving system control device 110 and power generation system control device 210. Are controlled in a coordinated manner to control electric power input / output to / from the power storage device 300.

  Such a power storage system control device 310 includes a ROM that stores a program for controlling the power storage device 300, a CPU that executes the program stored in the ROM, and a RAM as a storage device. The power storage device 300 is controlled, and in particular, the power storage system control device 310 according to the present embodiment sets an upper limit value of the SOC of the power storage device 300 and, based on this, power input / output to / from the power storage device 300 Various functions are provided to control the above. That is, the power storage system control device 310 is based on the temperature transition prediction function for predicting the transition of the internal temperature of the power storage device 310 and the transition of the internal temperature of the power storage device 310 predicted by the temperature transition prediction function. An SOC upper limit value setting function for setting an upper limit value of the SOC of 310.

  Examples of the weak electric load 600 include various electric load devices such as an air conditioner, a car navigation system, and a wiper.

  Next, the SOC upper limit setting process of power storage device 300 by power storage system control device 310 will be described based on the flowchart shown in FIG. FIG. 2 is a flowchart showing an SOC upper limit setting process of power storage device 300 by power storage system control device 310. This process is performed when an ignition-on operation of the electric vehicle is performed and the vehicle is in a traveling state. Here, in the present embodiment, in addition to the case where the electric vehicle is actually traveling, the ignition on operation of the electric vehicle is performed even when the electric vehicle is not actually traveling (for example, when it is temporarily stopped). It is assumed that the vehicle is in the “running state” including the case where the electric vehicle is activated (the same applies to the second and third embodiments described later). Further, this process is repeatedly executed at predetermined time intervals.

First, in step S <b> 101, the power storage system control device 310 acquires the internal temperature T _bat of the power storage device 300, the outside air temperature T _air , and the heat dissipation characteristics of the power storage device 300. Note that the internal temperature T _bat of the power storage device 300 can be acquired, for example, by receiving an output from a temperature sensor (not shown) provided inside the power storage device 300. The outside air temperature T _air can be acquired by receiving an output from a temperature sensor (not shown) for detecting the ambient temperature of the power storage device 300, for example. Furthermore, the heat dissipation characteristics of the power storage device 300 can be acquired by reading out the heat dissipation characteristics of the power storage device 300 stored in advance in the power storage device 300 or the power storage system control device 310. Note that examples of the heat dissipation characteristics of the power storage device 300 include a thermal time constant and a heat capacity of the power storage device 300.

In step S102, based on the internal temperature T _bat of the power storage device 300 acquired in step S101, the outside air temperature T _air , and the heat dissipation characteristics of the power storage device 300, the electric vehicle is currently When it is assumed that the vehicle is immediately parked from the traveling state (that is, when the ignition off operation of the electric vehicle is performed and the electric vehicle is left unattended), the internal temperature of the power storage device 300 during parking is Transition prediction is performed.

FIG. 3A shows an example of the transition of the internal temperature of power storage device 300 during parking, which is predicted by the temperature transition prediction function of power storage system control device 310. In general, it is known that when the electric vehicle is changed from a running state to a parked state, the internal temperature of the power storage device 300 tends to approach the outside air temperature T _air . Therefore, in the present embodiment, based on the internal temperature T _bat of the power storage device 300, the outside air temperature T _air , and the heat dissipation characteristics of the power storage device 300, as shown in FIG. 3A, the current time (that is, the internal temperature of the power storage device 300). The transition of the internal temperature of the power storage device 300 during parking in a manner that approaches the outside air temperature T _air with the passage of time from the time t ₀ when the transition of the power storage device 300 is predicted. Predict changes in internal temperature).

In step S103, the SOC upper limit value setting function of the power storage system controller 310, acquires the predetermined temperature _{T 0} of the preset power storage device 300 is performed. The predetermined temperature T ₀ is a temperature determined in the design stage of the power storage device 300, and is a predetermined threshold temperature used for determining the upper limit value of the SOC. Obtaining predetermined temperature T ₀ is, for example, in the power storage device 300 or the power storage system control device 310 were allowed to pre-stored predetermined temperature T _0, is performed by reading this.

In step S104, based on the transition of the internal temperature of power storage device 300 predicted in step S102 by the SOC upper limit setting function of power storage system control device 310, the internal temperature of power storage device 300 is the predetermined temperature acquired in step S103. A determination is made as to whether or not to continue to transition at a temperature higher than T ₀ (always to transition at a temperature higher than a predetermined temperature T ₀ ). If it is determined that the internal temperature of power storage device 300 continues to change at a temperature higher than predetermined temperature T ₀ , the process proceeds to step S105, and otherwise, the process proceeds to step S106.

In step S105, in step S104, when the internal temperature of the power storage device 300, since it is determined that the user continues to remain at a temperature higher than the predetermined temperature T _0, the electric vehicle becomes immediately parked from the running state, the power storage device In order to suppress degradation of power storage device 300 due to 300 being held in a high temperature / high SOC state, upper limit SOC _{upper_lim} of SOC of power storage device 300 is set to a preset reference SOC (hereinafter referred to as reference SOC). It is set lower than SOC ₀ ). That is, in step S105, the SOC usage range of power storage device 300 is reduced. Here, the reference SOC ₀ is an SOC that is determined in the design stage of the power storage device 300, and is the SOC that is used as a reference when setting the upper limit SOC _{upper_lim} of the SOC of the power storage device 300.

For example, in the example shown in FIG. 3B, the internal temperature of power storage device 300 predicted in step S102 continues to change at a temperature higher than predetermined temperature T _0, so the process proceeds to step S105 and the upper limit of SOC of power storage device 300 is reached. The value SOC _{upper_lim} is set to a value lower than the reference SOC ₀ .

In step S105, when the upper limit value SOC _{upper_lim} of SOC is set lower than the reference SOC _0, when a specific value of the upper limit value SOC _{upper_lim} of SOC is determined, for example, it is predicted in step S102. changes and the internal temperature of the power storage device 300, based on the difference between the predetermined temperature T _0, may be determined. Specifically, if the difference between the transition of the internal temperature of power storage device 300 and predetermined temperature T ₀ is relatively large, upper limit value SOC _{upper_lim} of SOC is set to a relatively low value, while power storage When the difference between the transition of the internal temperature of the apparatus 300 and the predetermined temperature T ₀ is relatively small, the SOC upper limit value SOC _{upper_lim} may be set to a value closer to the reference SOC ₀ .

On the other hand, in step S104, the internal temperature of the power storage device 300, if it is not determined to continue to remain at a higher temperature than the predetermined temperature T _0, the process proceeds to step S106. In step S106, based on the transition of the internal temperature of power storage device 300 predicted in step S102 by the SOC upper limit setting function of power storage system control device 310, the internal temperature of power storage device 300 is the predetermined temperature acquired in step S103. A determination is made as to whether or not to continue to transition at a temperature lower than T ₀ (always to transition at a temperature lower than a predetermined temperature T ₀ ). If it is determined that the internal temperature of power storage device 300 continues to transition at a temperature lower than predetermined temperature T ₀ , the process proceeds to step S107, and otherwise, the process proceeds to step S108.

In step S107, in step S106, the internal temperature of the power storage device 300, since it is determined that the user continues to remain at a temperature lower than the predetermined temperature T _0, even if the electric vehicle becomes immediately parked, the power storage device 300 is a high temperature The possibility of being held in the high SOC state is relatively low, and therefore, the upper limit SOC _{upper_lim} of the SOC of the power storage device 300 is set higher than the reference SOC ₀ . That is, in step S107, the SOC usage range of power storage device 300 is expanded.

For example, in the example shown in FIG. 3C, the internal temperature of the predicted power storage device 300 in step S102 and continues to remain at a higher temperature than the predetermined temperature _{T 0,} the process proceeds to step S107, the upper limit of the SOC of power storage device 300 The value SOC _{upper_lim} is set to a value higher than the reference SOC ₀ .

In step S107, when the upper limit SOC _{upper_lim} of SOC is set to be higher than the reference SOC ₀ , a specific value of the upper limit SOC _{upper_lim} of SOC is determined, for example, in step S102. changes and the internal temperature of the power storage device 300, based on the difference between the predetermined temperature T _0, may be determined. Specifically, when the transition between the internal temperature of power storage device 300 and the predetermined temperature T ₀ is relatively large, upper limit SOC _{upper_lim} of SOC is set to a relatively high value, while When the difference between the transition of the internal temperature of the apparatus 300 and the predetermined temperature T ₀ is relatively small, the SOC upper limit value SOC _{upper_lim} may be set to a value closer to the reference SOC ₀ .

On the other hand, in step S106, the internal temperature of the power storage device 300, if it is not determined to continue to remain at a temperature lower than the predetermined temperature T _0, the routine proceeds to step S108. For example, in the example shown in FIG. 3D, the internal temperature of power storage device 300 changes from a temperature higher than predetermined temperature T ₀ to a temperature lower than predetermined temperature T ₀ . internal temperature is not determined to continue to remain at a higher temperature than the predetermined temperature _{T 0} (step S104 = No), and, in step S106, the internal temperature of the power storage device 300, at a temperature lower than the predetermined temperature _{T 0} Since it is not determined that the transition continues (step S106 = No), the process proceeds to step S108.

In step S108, (in FIG. 3D, from time _{t 0} to time _{t 1)} greater area than the internal temperature of the power storage device 300 is a predetermined temperature _{T 0} in the effect on the degradation of the power storage device 300, and the interior of the power storage device 300 The influence on the deterioration of power storage device 300 is calculated in a region where the temperature is lower than predetermined temperature T ₀ (from time t ₁ to time t ₂ in FIG. 3D). Then, in step S108, and the influence on the degradation of the power storage device 300 in the region higher than the predetermined temperature T _0, the effect on the degradation of the power storage device 300 in the region lower than the predetermined temperature T _0, but whether substantially equal If these are substantially equal, the process proceeds to step S109. On the other hand, when these are not equal, it progresses to step S110.

Incidentally, higher than the predetermined temperature T ₀ (low) in the region, influence on the deterioration of the power storage device 300, for example, higher than the predetermined temperature T ₀ (low) the length of time in the state, and the predetermined temperature T ₀ Based on the magnitude of the difference, it can be calculated. Further, in step S108, whether the effect on the degradation of the power storage device 300 in the region higher than the predetermined temperature T _0, the effect on the degradation of the power storage device 300 in the region lower than the predetermined temperature T _0, but substantially equal not In the determination, it is not always necessary that they are equal in a strict sense, and it is sufficient that they can be determined to be equal.

In step S109, the effect on the degradation of the power storage device 300 in the region higher than the predetermined temperature T _0, the effect on the degradation of the power storage device 300 in the region lower than the predetermined temperature T _0, for but is determined to substantially equal, In this case, since it is not necessary to set the upper limit SOC _{upper_lim} of the SOC higher or lower than the reference SOC ₀ , the upper limit SOC _{upper_lim} of the SOC is set to a value equal to the reference SOC ₀ .

On the other hand, determination in step S108, and the influence on the degradation of the power storage device 300 in the region higher than the predetermined temperature T _0, the effect on the degradation of the power storage device 300 in the region lower than the predetermined temperature T _0, and but not substantially equal If so, the process proceeds to step S110. In step S110, towards the impact on the deterioration of the power storage device 300 in the region higher than the predetermined temperature T ₀ is, a determination is greater or not than the effect on the degradation of the power storage device 300 in the region lower than the predetermined temperature T ₀ Done.

Then, in step S110, if it is determined that the direction of influence on the deterioration of the power storage device 300 in the region higher than the predetermined temperature _{T 0} is large, the process proceeds to step S105, the upper limit _{SOC Upper_lim} of SOC, the reference SOC ₀ Set lower. In this case, the specific value of SOC upper limit value SOC _{upper_lim} may be set according to the magnitude of the influence on deterioration of power storage device 300 in a region higher than predetermined temperature T ₀ , for example.

On the other hand, in step S110, if it is not determined that the direction of influence on the deterioration of the power storage device 300 in the region higher than the predetermined temperature T ₀ is greater (i.e., to degradation of the power storage device 300 in the region lower than the predetermined temperature T ₀ If it is determined that the influence is greater), the process proceeds to step S107, and the upper limit value SOC _{upper_lim} of the SOC is set higher than the reference SOC ₀ . In this case, the specific value of SOC upper limit value SOC _{upper_lim} may be set according to the magnitude of the influence on deterioration of power storage device 300 in a region lower than predetermined temperature T ₀ , for example.

As described above, the setting process of the upper limit SOC _{upper_lim} of the SOC of the power storage device 300 according to the present embodiment is performed. Then, the SOC upper limit value SOC _{upper_lim} set in this way is sent to drive system control device 110 and power generation system control device 210 shown in FIG. 1, and by these drive system control device 110 and power generation system control device 210, By controlling the output of the power regenerated by the drive motor 101 to the power storage device 300 and controlling the power generation by the power generation engine 210, the power input / output to / from the power storage device 300 is controlled. It will be.

A specific application example of the above-described SOC upper limit setting process will be described with reference to the graph shown in FIG. FIG. 4 is a graph showing a specific application example of the SOC upper limit setting process according to the present embodiment. In FIG. 4, the upper row shows the internal temperature T _bat of the power storage device 300 during the traveling of the electric vehicle. The time change shows the time change of the SOC upper limit value SOC _{upper_lim} set based on the SOC upper limit value setting process according to the present embodiment while the electric vehicle is traveling.

As shown in FIG. 4, between the time _{t 10} the time _{t 11,} with the passage of time, although the internal temperature _{T bat} of the power storage device 300 is rising, the internal temperature _{T bat} predetermined temperature of the power storage device 300 T ₀ has remained at below. Therefore, between the time t ₁₀ from the time t _11, even if the electric vehicle becomes immediately parked from the running state, the power storage device 300 is less likely to be held at a high temperature and high SOC state, but rather the power storage device 300 Therefore, the upper limit SOC _{upper_lim} of SOC is set to a value higher than the reference SOC ₀ . In addition, between the time _{t 10} from the time _{t 11,} along with the internal temperature _{T bat} of the power storage device 300 rises over time, is set to a low value with the passage of the SOC upper limit _{SOC Upper_lim} the time of The

Further, between the time _{t 11} the time _{t 12,} the internal temperature _{T bat} of the power storage device 300 is rapidly increased, it has remained at a predetermined temperature _{T 0} or more. Therefore, between the time t ₁₂ from the time t _11, when the electric vehicle becomes immediately parked from the running state, the power storage device 300 will be held at a high temperature and high SOC state, thereby the power storage device 300 is degraded Therefore, the upper limit SOC _{upper_lim} of the SOC is set to a value lower than the reference SOC ₀ . In addition, between the time _{t 12} from the time _{t 11,} along with the internal temperature _{T bat} of the power storage device 300 rises over time, is set to a low value with the passage of the SOC upper limit _{SOC Upper_lim} the time of The That is, in a period of time _{t 12} from the time _{t 11,} is gradually limit the use range of SOC of the power storage device 300.

Between time t ₁₂ and time t ₁₃ , the internal temperature T _bat of power storage device 300 is constant, but changes at a predetermined temperature T ₀ or more. Therefore, even during the time t ₁₂ from the time t _13, when the electric vehicle becomes immediately parked from the running state, the power storage device 300 will be held at a high temperature and high SOC state, thereby the power storage device 300 In order to suppress the deterioration, the upper limit SOC _{upper_lim} of the SOC is set to a value lower than the reference SOC ₀ . In addition, between the time t ₁₂ from the time t _13, it is predicted by the temperature transition prediction function of the power storage system control device 310, since the transition of the internal temperature of the power storage device 300 becomes constant in the parked, SOC upper limit SOC of _{upper_lim} is maintained at a constant value regardless of the passage of time.

Between the time _{t 13} the time _{t 14,} although the internal temperature _{T bat} of the power storage device 300 is lowered with the lapse of time, the internal temperature _{T bat} of the power storage device 300 has remained at a predetermined temperature _{T 0} or more. Therefore, even during the time t ₁₃ from the time t _14, when the electric vehicle becomes immediately parked from the running state, the power storage device 300 will be held at a high temperature and high SOC state, thereby the power storage device 300 In order to suppress the deterioration, the upper limit SOC _{upper_lim} of the SOC is set to a value lower than the reference SOC ₀ . Incidentally, between the time _{t 13} the time _{t 14,} along with the internal temperature _{T bat} of the power storage device 300 is lowered with the lapse of time, is set to a higher value with the passage of the SOC upper limit _{SOC Upper_lim} the time of The That is, in between time _{t 13} the time _{t 14,} is gradually relax the use range of SOC of the power storage device 300.

Between the time _{t 14} the time _{t 15,} the internal temperature _{T bat} of the power storage device 300 is lowered with the lapse of time, the internal temperature _{T bat} of the power storage device 300 has remained below the predetermined temperature _{T 0.} Therefore, between the time t ₁₄ the time t _15, even if the electric vehicle becomes immediately parked from the running state, the power storage device 300 is less likely to be held at a high temperature and high SOC state, but rather the power storage device 300 Therefore, the upper limit SOC _{upper_lim} of SOC is set to a value higher than the reference SOC ₀ . That is, in a period of time _{t 15} from the time _{t 14,} is actively expand the use range of SOC of the power storage device 300.

As described above, in the present embodiment, the electric vehicle is immediately parked from the current traveling state based on the internal temperature T _bat of the power storage device 300, the outside air temperature T _air , and the heat dissipation characteristics of the power storage device 300. When the assumption is made, the transition of the internal temperature of the power storage device 300 during parking is predicted, and the upper limit SOC _{upper_lim} of the SOC is set based on the predicted transition of the internal temperature of the power storage device 300. Therefore, according to the present embodiment, the amount of power stored in the power storage device 300 can be appropriately controlled, so that no matter what timing the vehicle is parked from the running state, Deterioration of power storage device 300 due to device 300 being maintained in a high temperature / high SOC state can be effectively prevented.

In particular, in the present embodiment, when the internal temperature of the power storage device 300 during parking continues to change at a temperature higher than the predetermined temperature T ₀ (or in the region higher than the predetermined temperature T ₀ ). In the case where the influence on the deterioration is large), by setting the SOC upper limit value SOC _{upper_lim} to be lower than the reference SOC ₀ , when the vehicle is changed from the running state to the parked state, -It is intended to prevent deterioration of the power storage device 300 due to being held in a high SOC state. On the other hand, when the internal temperature of power storage device 300 is kept at a temperature lower than predetermined temperature T ₀ during parking (or against deterioration of power storage device 300 in a region lower than predetermined temperature T ₀ . When the influence is large), by setting the upper limit SOC _{upper_lim} of SOC higher than the reference SOC ₀ , the SOC usage range of the power storage device 300 is actively expanded, thereby increasing the energy efficiency. Can do.

When the electric vehicle is parked, deterioration of the power storage device 300 due to the power storage device 300 being held in a high temperature / high SOC state is determined by the internal temperature of the power storage device 300 and the SOC. It is. On the other hand, since the power storage device 300 used in the electric vehicle has a large heat capacity (heat dissipation characteristic), it takes a relatively long time for the internal temperature of the power storage device 300 to converge to the outside air temperature. Become. Therefore, for example, when the upper limit value of the SOC is controlled using not the internal temperature of power storage device 300 but the outside air temperature around power storage device 300, the control is not based on the internal temperature of power storage device 300. There is a problem that control cannot be performed properly. On the other hand, in the present embodiment, based on the internal temperature T _bat of the power storage device 300, the outside air temperature T _air , and the heat dissipation characteristics of the power storage device 300, the transition of the internal temperature of the power storage device 300 during parking is predicted. Based on this, the upper limit SOC _{upper_lim} of the SOC is set, so that such a problem can be solved effectively.

<< Second Embodiment >>
Next, a second embodiment of the present invention will be described.
The second embodiment is the same as the first embodiment except that the electric vehicle having the system configuration shown in FIG. 1 (the electric vehicle of the first embodiment described above) operates as described below.

  Hereinafter, the SOC upper limit setting process of the power storage device 300 according to the second embodiment will be described based on the flowchart shown in FIG. 5. FIG. 5 is a flowchart showing the SOC upper limit setting process of the power storage device 300 according to the second embodiment. This process is performed when an ignition-on operation of the electric vehicle is performed and the vehicle is in a traveling state. Further, this process is repeatedly executed at predetermined time intervals.

First, in step S201, as in step S101 in the first embodiment described above, the power storage system control device 310 acquires the internal temperature T _bat of the power storage device 300, the outside air temperature T _air , and the heat dissipation characteristics of the power storage device 300. Done.

  In step S202, as in step S102 in the first embodiment described above, when it is assumed that the electric vehicle is immediately parked from the current traveling state by the temperature transition prediction function of the power storage system control device 310, the vehicle is parked. The transition of the internal temperature of the power storage device 300 is predicted.

In step S203, the current SOC upper limit value SOC _{upper_lim} (that is, the SOC upper limit value set in the previous process) is acquired. In the following, the upper limit SOC _{upper_lim} of the current SOC is set to SOC _{upper_lim} [n], and the upper limit SOC _{upper_lim} of the SOC set in the current process is set to SOC _{upper_lim} [n + 1]. In step S203, if the SOC upper limit value SOC _{upper_lim} is not set, a preset reference SOC ₀ may be used instead of the SOC upper limit value SOC _{upper_lim} .

In step S204, based on the transition of the internal temperature of the power storage device 300 during parking predicted in step S202 and the current SOC upper limit value SOC _{upper_lim} [n] acquired in step S203, the current deterioration load amount (hereinafter, “Predicted degradation load amount L _pre ”) is calculated. Here, the deterioration load amount is a degree of giving a deterioration load to the power storage device 300 when the electric vehicle is immediately parked from the current traveling state and left in the parking state for a certain period of time. The higher the deterioration load, the higher the degree of deterioration of the power storage device 300 when the electric vehicle is parked and left for a certain period of time.

In step S <b> 205, the reference deterioration load is determined based on the preset predetermined temperature T ₀ of power storage device 300 and the preset reference SOC ₀ of power storage device 300 by the SOC upper limit setting function of power storage system control device 310. calculation of the amount _{L 0} is performed. Here, both the predetermined temperature T ₀ and the reference SOC ₀ are the temperature and SOC determined in the design stage of the power storage device 300, and similarly, the reference deterioration load amount L ₀ is also the deterioration determined in the design stage. Load amount.

In step S206, the SOC upper limit value setting function of the power storage system control device 310, and the predicted deterioration load _{L pre} calculated in step S204, the comparison with the reference deterioration load _{L 0} calculated in step S205 is performed, When the predicted deterioration load amount L _pre is higher than the reference deterioration load amount L ₀ , the process proceeds to step S207, and when the predicted deterioration load amount L _pre is equal to or less than the reference deterioration load amount L ₀ , the process proceeds to step S211.

In step S207, since it is determined in step S206 that the predicted deterioration load amount L _pre is higher than the reference deterioration load amount L ₀ , the SOC upper limit value at the time of the current process is determined by the SOC upper limit setting function of the power storage system control device 310. The value SOC _{upper_lim} [n + 1] is set to a value lower than the current SOC upper limit value SOC _{upper_lim} [n] by a certain amount X [%]. That is, SOC _{upper_lim} [n + 1] = SOC _{upper_lim} [n] −SOC _{upper_lim} [n] × (X / 100). Here, the fixed amount X [%] is not particularly limited and may be set as appropriate. In the present embodiment, for example, the initial value of the fixed amount X [%] is set to 5 [%].

In step S208, it is determined whether or not the process of lowering the SOC _{upper_lim} (the process of step S207 described above) has been continuously performed by the SOC upper limit setting function of the power storage system control device 310, that is, in the previous process, It is determined whether or not the process of lowering the SOC _{upper_lim} has been performed. When the process of lowering the SOC _{upper_lim} is continuously performed, the process proceeds to step S209, and otherwise, the process proceeds to step S210.

In step S209, since the process of lowering the SOC _{upper_lim} has been continuously performed, the fixed amount X [%] is set to a value twice the initial value, and the process returns to step S201. That is, for example, when the initial value of the fixed amount X [%] is 5 [%], the fixed amount X [%] is set to 10%.

On the other hand, the process of lowering the SOC _{upper_lim} is not continuously performed, and it is determined that the process of raising the SOC _{upper_lim} (step S211 described later) has been performed in the previous process, and the predetermined amount X [%] is set to the initial value 1 The value is set to / 2, and the process returns to step S201. That is, for example, when the initial value of the fixed amount X [%] is 5 [%], the fixed amount X [%] is set to 2.5%.

When it is determined in step S206 described above that the predicted deterioration load amount L _pre is equal to or less than the reference deterioration load amount L ₀ , the process proceeds to step S211. In step S211, since it is determined that the predicted deterioration load amount L _pre is equal to or less than the reference deterioration load amount L ₀ , the SOC upper limit value SOC _{upper_lim} [ n + 1] is set to a value higher than the current SOC upper limit value SOC _{upper_lim} [n] by a certain amount X [%]. That is, SOC _{upper_lim} [n + 1] = SOC _{upper_lim} [n] + SOC _{upper_lim} [n] × (X / 100).

In step S212, it is determined whether or not the process of raising the SOC _{upper_lim} (the process of step S211 described above) has been continuously performed by the SOC upper limit setting function of the power storage system control device 310, that is, in the previous process, It is determined whether or not the process of raising the SOC _{upper_lim} has been performed. If the process of raising the SOC _{upper_lim} is continuously performed, the process proceeds to step S213, and otherwise, the process proceeds to step S214.

In step S213, since the process of raising the SOC _{upper_lim} was continuously performed, the fixed amount X [%] is set to a value twice the initial value, and the process returns to step S201.

On the other hand, it is determined that the process of raising the SOC _{upper_lim} is not continuously performed, and the process of lowering the SOC _{upper_lim} (step S207) was performed in the previous process, and the predetermined amount X [%] is reduced to 1/2 of the initial value. And return to step S201.

  In steps S209 and S213 described above, the constant amount X [%] is set to a value twice the initial value, but it is not necessarily required to be a value twice the initial value. Therefore, it may be set as appropriate. Similarly, in steps S210 and S214, the fixed amount X [%] is set to a value that is ½ of the initial value, but it is not necessarily required to be a value that is ½ of the initial value. What is necessary is just to set suitably in the range.

According to 2nd Embodiment, in addition to the effect of 1st Embodiment mentioned above, there exist the following effects.
That is, according to the second embodiment, the predicted deterioration is predicted by predicting the current deterioration load amount based on the transition of the internal temperature of the power storage device 300 during parking and the current SOC upper limit value SOC _{upper_lim} [n]. The load amount L _pre is calculated, and the current upper limit SOC _{upper_lim} [n] is sequentially changed based on the relationship between the calculated predicted deterioration load amount L _pre and the reference deterioration load amount L ₀ . The upper limit SOC _{upper_lim} of the SOC can be determined more appropriately.

In addition, according to the second embodiment, the electric vehicle can be changed by sequentially changing the current upper limit SOC _{upper_lim} [n] based on the relationship between the predicted deterioration load amount L _pre and the reference deterioration load amount L _0. The degree of deterioration when the vehicle is immediately parked from the current running state and left for a certain period of time in the parked state can be brought close to the degree of deterioration at the design stage. As a result, when the vehicle is changed from the running state to the parked state, it is possible to prevent the power storage device 300 from being deteriorated due to the power storage device 300 being kept in the high temperature / high SOC state during parking. However, it is possible to prevent the SOC usage range from being restricted more than necessary, and as a result, energy efficiency can be further increased.

<< Third Embodiment >>
Next, a third embodiment of the present invention will be described.
In the third embodiment, in the electric vehicle having the system configuration shown in FIG. 1 (the electric vehicle according to the first and second embodiments described above), the power storage system control device 310 includes the temperature transition prediction function and the SOC upper limit setting. In addition to the functions, the parking time estimation function, the parking history information detection function, the parking history information storage function, and the reference deterioration load amount correction function, and the second embodiment, except that it operates as described below. It is the same.

  It should be noted that the parking time estimation function of the power storage system control device 310 according to the third embodiment is based on the current date and time, the travel date and time history of the electric vehicle, and the parking time history, while the electric vehicle is traveling. This is a function for estimating the parking time when the parking state is reached.

  In addition, the parking history information detection function of the power storage system control device 310 according to the third embodiment is performed when the electric vehicle is in a parked state and the internal temperature of the power storage device 100, the outside air temperature, and the power storage device 300 during parking. The function is to detect the SOC at predetermined time intervals, and the parking history information storage function is a function to store the detected internal temperature, outside air temperature, and SOC as parking history information.

Furthermore, the reference deterioration load amount correction function of the power storage system control device 310 according to the third embodiment is a function that performs correction processing of the reference deterioration load amount L ₀ based on the parking history information stored by the parking history information storage function. It is.

  Hereinafter, the SOC upper limit setting process of the power storage device 300 according to the third embodiment will be described based on the flowchart shown in FIG. 6. FIG. 6 is a flowchart illustrating the SOC upper limit setting process of the power storage device 300 according to the third embodiment. This process is performed when an ignition-on operation of the electric vehicle is performed and the vehicle is in a traveling state. Further, this process is repeatedly executed at predetermined time intervals.

First, in steps S301 to S303, similarly to steps S201 to S203 in the second embodiment described above, the internal temperature T _bat of the power storage device 300, the outside air temperature T _air , and the power storage device 300 are controlled by the power storage system control device 310. When it is assumed that the electric vehicle is immediately parked from the current running state by acquiring heat dissipation characteristics (step S301) and the temperature transition prediction function of the power storage system control device 310, the internal temperature of the power storage device 300 during parking is calculated. Transition prediction (step S302) and acquisition of the upper limit SOC _{upper_lim} [n] of the current SOC (step S303) are performed.

Next, in step S304, the parking time estimation function of the power storage system control device 310 causes the electric vehicle to immediately change from the current traveling state to the parking state based on the current date and time, the traveling date and time history of the electric vehicle, and the parking time history. When it is assumed that the parking time is assumed, the parking time is estimated (hereinafter, the estimated parking time is referred to as an estimated parking time H _pre ). Note that the travel date / time history of the electric vehicle and the parking time history are stored in, for example, a RAM provided in the power storage system control device 310 and used. do it.

In step S305, the internal temperature of the power storage device 300 during parking, predicted in step S302, by the SOC upper limit setting function of the power storage system control device 310, the current SOC upper limit value SOC _{upper_lim} [n] obtained in step S303. ] And the estimated parking time H _pre calculated in step S304, the current deterioration load amount (hereinafter referred to as “predicted deterioration load amount L _pre ”) is calculated.

In step S306, the SOC upper limit value setting function of the power storage system control device 310 is used to set the predetermined temperature T ₀ set in advance, the reference SOC ₀ set in advance, and the estimated parking time H _pre calculated in step S304. , calculation of the reference deterioration load L ₀ is performed. Here, both the predetermined temperature T ₀ and the reference SOC ₀ are the temperature and SOC determined in the design stage of the power storage device 300, and similarly, the reference deterioration load amount L ₀ is also the deterioration determined in the design stage. Load amount.

In the step S306, the reference deterioration load correction processing described later, when it is determined that the reference deterioration load L is necessary to correct the _zero correction of the reference deterioration load L ₀ is performed, the correction The later reference deterioration load amount L _correct is adopted as the reference deterioration load amount L ₀ .

Then, in steps S307 to S315, as in steps S206 to S214 in the second embodiment described above, the predicted deterioration load amount L _pre is compared with the reference deterioration load amount L ₀ (step S307), and the constant amount X [ %] Based on SOC upper limit SOC _{upper_lim} [n + 1] (steps S308 and S312), and a process of changing the constant amount X [%] (steps S309 to S311 and S313 to S315), respectively.

  As described above, the SOC upper limit setting process of the power storage device 300 according to the third embodiment is performed.

Next, the correction process of the reference deterioration load L ₀ according to the third embodiment, with reference to the flowchart shown in FIG. 7 will be described. Figure 7 is a flowchart showing the correction processing of the reference deterioration load L ₀ according to a third embodiment. This process is started when an ignition-off operation is performed on the electric vehicle and the electric vehicle is actually parked.

  First, in step S401, the parking history information detection function of the power storage system control device 310 detects the internal temperature of the power storage device 300, the SOC of the power storage device 300, and the outside air temperature.

  In step S402, the storage history information storage function of power storage system control device 310 performs storage processing of the internal temperature of power storage device 300, the SOC of power storage device 300, and the outside air temperature detected in step S401.

  In step S403, power storage system control device 310 determines whether or not the driver has performed an ignition on operation. If the ignition-on operation has been performed, the process proceeds to step S404. If the ignition-on operation has not been performed, the process returns to step S401, and at a predetermined time interval, the internal temperature of the power storage device 300, the SOC of the power storage device 300, and Detection (step S401) and storage (step S402) of the outside air temperature are repeated. Note that whether or not the driver has performed an ignition-on operation can be determined by, for example, receiving a signal corresponding to the ignition-on operation from a vehicle controller (not shown) provided in the electric vehicle. .

In step S404, the actual parking time _Hact is calculated by measuring the time from the previous ignition-off operation performed by the power storage system control device 310 until the ignition-on operation is performed in step S403.

  In step S405, by the reference deterioration load amount correction function of the power storage system control device 310, the actual internal temperature history of the power storage device 300 during parking, the actual outside air temperature history, and the power storage system stored in step S402. Based on the heat dissipation characteristics of control device 310, the actual internal temperature transition of power storage device 300 during parking is calculated.

In step S406, the actual deterioration in the internal temperature of the power storage device 300 during parking calculated in step S405, the actual parking time H _act calculated in step S404, and the step by the reference deterioration load amount correction function of the power storage system control device 310. From the actual SOC history of power storage device 300 stored in S402, actual deterioration load _{Lact_1} during parking is calculated.

In step S407, based on the preset predetermined temperature T ₀ , the actual parking time H _act calculated in step S404, and the preset reference SOC ₀ by the reference deterioration load amount correction function of the power storage system control device 310. The deterioration load amount L _{act_2} based on the actual parking time is calculated. The deterioration load amount L _{act_2} based on the actual parking time is determined in step S306 of the above-described SOC upper limit setting process except that the actual parking time H _act is used instead of the estimated parking time H _pre . are those calculated in the same manner as the reference deterioration load L _0.

In step S408, the deterioration load based on the actual deterioration load amount L _{act_1} during parking calculated in step S406 and the actual parking time calculated in step S407 by the reference deterioration load amount correction function of the power storage system control device 310. A determination is made whether the amount L _{act — 2} is substantially the same. The actual degradation load L _{ACT_1} in parked, if the deterioration load L _{ACT_2} based on actual parking time is substantially comparable values, without correcting the reference deterioration load L _0, This process ends. On the other hand, the actual degradation load L _{ACT_1} in parked, if the deterioration load L _{ACT_2} based on actual parking time is determined not to be comparable value, the process proceeds to step S409. Note that the actual degradation load L _{ACT_1} in parked, when a deterioration load L _{ACT_2} based on actual parking time is substantially determined whether the same degree is not necessarily these same in a strict sense It is not necessary to be a value, and it is sufficient that the value is determined to be practically the same.

At step S409, the by the reference deterioration load correction function of the power storage system control device 310, and the actual degradation load _{L ACT_1} in parked, according to a difference between the degradation load _{L ACT_2} based on actual parking time, the reference deterioration The load amount L ₀ is corrected, a corrected reference deterioration load amount L _correct is calculated, and the present process ends. As described above, in step S306 of the SOC upper limit value setting process, the corrected reference deterioration load amount _Lcorrect calculated in this process is used.

As described above, the correction process of the reference deterioration load L ₀ according to the third embodiment is performed. The reference deterioration load L ₀ described above, each time the ignition-off operation, and ignition-on operation is performed, is repeatedly executed.

According to 3rd Embodiment, in addition to 1st Embodiment and 2nd effect which were mentioned above, there exist the following effects.
That is, according to the third embodiment, when the upper limit SOC _{upper_lim} of the SOC is set, the estimated parking time H _pre is calculated based on the current date and time, the history of the travel date and time of the electric vehicle, and the history of the parking time. Then, the estimated deterioration load amount L _pre and the reference deterioration load amount L ₀ are calculated in consideration of the estimated parking time H _pre , and therefore, the predicted deterioration load amount L _pre and the reference deterioration load amount L ₀ are determined by the driver. As a result, the predicted deterioration load amount L _pre and the reference deterioration load amount L ₀ calculated can be made highly accurate. As a result, the upper limit SOC _{upper_lim} of the SOC can be determined more appropriately.

In addition, according to the third embodiment, on the basis of transition of internal temperature of the power storage device 300 during parking of the electric vehicle, by performing the correction process of the reference deterioration load L _0, during travel of the electric vehicle, Even when the calculated predicted deterioration load amount L _pre and the reference deterioration load amount L ₀ are different from the actual deterioration load amount of the power storage device 300 during parking, the power storage device 300 is in the parking state of the electric vehicle. It is possible to effectively suppress the actual degree of deterioration of the power storage device 300 from deviating from the degree of deterioration at the design stage of the power storage device 300 without consuming the stored power.

  In the first to third embodiments described above, the temperature transition prediction function of the power storage device 300 is set in the prediction means of the present invention, and the SOC upper limit setting function and the reference deterioration load amount correction function of the power storage device 300 are set in the present invention. The parking history information detection function of the power storage device 300 corresponds to the detection means of the present invention, and the parking history information storage function of the power storage device 300 corresponds to the storage means of the present invention.

  As mentioned above, although embodiment of this invention was described, these embodiment was described in order to make an understanding of this invention easy, and was not described in order to limit this invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  For example, in the above-described embodiment, the power generation apparatus 200 is configured to have the power generation engine 201, but may be configured to have a fuel cell instead of the power generation engine 201, and further, the power generation apparatus The configuration may be such that 200 is not provided.

Further, in the above-described embodiment, the configuration in which the internal temperature T _bat of the power storage device 300 is measured by the temperature sensor provided in the power storage device 300 is illustrated, but the internal temperature T _bat of the power storage device 300 is electrically The configuration may be such that the vehicle is estimated based on the traveling state of the vehicle (for example, the traveling state obtained from the load of the power storage device 300, the load of the driving motor 101, or the like).

DESCRIPTION OF SYMBOLS 100 ... Drive apparatus 101 ... Drive motor 102 ... Drive inverter 110 ... Drive system control apparatus 200 ... Power generation apparatus 201 ... Power generation engine 202 ... Power generation motor 203 ... Power generation inverter 210 ... Power generation system control apparatus 300 ... Power storage apparatus 310 ... Power storage system control device

Claims (12)

In an electric vehicle equipped with a power storage device for supplying electric power to a drive device,
Predicting means for predicting the transition of the internal temperature of the power storage device during parking when assuming that the driving state is changed to the parking state during the traveling of the electric vehicle;
An electric vehicle comprising: setting means for setting an upper limit value of the SOC of the power storage device based on a transition of the internal temperature of the power storage device predicted by the prediction means. The electric vehicle according to claim 1,
The predicting means predicts a transition of the internal temperature of the power storage device based on a current internal temperature of the power storage device, a current outside temperature, and a heat dissipation characteristic of the power storage device stored in advance. Electric vehicle to do. The electric vehicle according to claim 1 or 2,
The setting means includes
When it is predicted by the predicting means that the internal temperature of the power storage device will change at a temperature higher than a preset predetermined temperature, the upper limit value of the SOC of the power storage device is set based on a preset reference SOC. Set too low,
When the predicting means predicts that the internal temperature of the power storage device changes at a temperature lower than the predetermined temperature, the upper limit value of the SOC of the power storage device is set higher than the reference SOC. A featured electric vehicle. In the electric vehicle according to claim 3,
The setting means includes
When it is predicted by the predicting means that the internal temperature of the power storage device will transition from a temperature higher than the predetermined temperature to a low temperature, or when it is predicted to transition from a temperature lower than the predetermined temperature to a high temperature. Is
Determining which of the state in which the internal temperature of the power storage device is higher than the predetermined temperature and the state in which the internal temperature of the power storage device is lower than the predetermined temperature has a large influence on the deterioration of the power storage device; Based on the above, an upper limit value of the SOC of the power storage device is set. The electric vehicle according to claim 4,
The setting means includes
When it is determined that the state at a temperature higher than the predetermined temperature has a greater influence on the deterioration of the power storage device, the upper limit value of the SOC of the power storage device is set lower than the reference SOC,
When it is determined that the state at a temperature lower than the predetermined temperature has a greater influence on the deterioration of the power storage device, the upper limit value of the SOC of the power storage device is set higher than the reference SOC. An electric vehicle characterized by. The electric vehicle according to claim 1 or 2,
The setting means includes
Based on the transition of the temperature of the power storage device predicted by the prediction means and the upper limit value of the current SOC, it is assumed that the electric vehicle is parked from the running state. Predict the amount of degradation load,
The predicted deterioration load amount, a predetermined temperature that is a preset internal temperature of the power storage device, and a reference deterioration load amount that is calculated based on a preset SOC that is a preset SOC of the power storage device. An electric vehicle characterized in that an upper limit value of the SOC of the power storage device is changed in accordance with the comparison result. The electric vehicle according to claim 6,
The setting means includes
When the predicted deterioration load amount is larger than the reference deterioration load amount, the upper limit of the SOC of the power storage device is determined according to the magnitude of the difference between the predicted deterioration load amount and the reference deterioration load amount. Set the value lower than the current SOC upper limit,
When the predicted deterioration load amount is equal to or less than the reference deterioration load amount, the SOC of the power storage device is determined according to the magnitude of the difference between the predicted deterioration load amount and the reference deterioration load amount. An electric vehicle characterized in that the upper limit value is set higher than the upper limit value of the current SOC. The electric vehicle according to claim 6 or 7,
The apparatus further comprises an estimation means for estimating the parking time when the electric vehicle is in the parking state from the driving state based on the driving date / time history and the parking time history of the electric vehicle. Electric vehicle. The electric vehicle according to claim 8,
The electric vehicle characterized in that the setting means predicts the deterioration load based on a transition of temperature of the power storage device, a current upper limit value of SOC, and a parking time estimated by the estimation means. The electric vehicle according to claim 8 or 9,
The electric vehicle characterized in that the setting means calculates the reference deterioration load amount based on the predetermined temperature, the predetermined SOC, and the parking time estimated by the estimation means. The electric vehicle according to any one of claims 8 to 10,
Detecting means for detecting the internal temperature of the power storage device, the outside air temperature, and the SOC of the power storage device at a predetermined time interval when the electric vehicle is parked;
An electric vehicle further comprising storage means for storing the detected internal temperature, outside air temperature, and SOC as parking history information. The electric vehicle according to claim 11,
The setting means calculates, based on the parking history information, a transition of an actual internal temperature of the power storage device and an actual parking time during parking,
The setting means calculates an actual deterioration load amount based on the calculated transition of the actual internal temperature of the power storage device and the actual parking time, and the actual parking time, the predetermined temperature, and the predetermined SOC. Based on, calculate the amount of degradation load based on parking time,
The electric vehicle according to claim 1, wherein the setting means corrects the reference deterioration load amount based on a difference between the actual deterioration load amount and the deterioration load amount based on the parking time.

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