JP2013218835A - Device for managing temperature of battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain concentration polarization of a battery without limiting a charging/discharging current.SOLUTION: Concentration polarization calculation means 24 calculates concentration polarization of a battery 11, and average concentration polarization calculation means 26 calculates average concentration polarization that is an average value per unit time of the concentration polarization. Concentration polarization reduction-needs determination means 27 determines whether or not there is a need of reducing concentration polarization. When the means 27 determines that there is a need of reducing the concentration polarization, battery temperature control means 28 warms the battery 11. Therefore, the concentration polarization can be restrained without limiting a charging/discharging current of the battery 11, so as to minimize influences of the battery 11 onto a charging/discharging characteristic.

Description

  The present invention provides a concentration polarization calculating means for calculating a concentration polarization of a battery, an average concentration polarization calculating means for calculating an average concentration polarization, which is an average value per unit time of the concentration polarization, and the above-mentioned based on the average concentration polarization. The present invention relates to a battery temperature management apparatus including a concentration polarization reduction necessity determination unit that determines whether or not a concentration polarization of a battery needs to be reduced, and a battery temperature control unit that heats the battery.

  When the secondary battery is pulse-charged with a large current, a shared voltage that gradually increases as the concentration polarization progresses when the pulse is applied, and a shared voltage that gradually decreases as the concentration polarization disappears when the pulse application ends. When at least one of the values is read and the value becomes equal to or greater than a predetermined threshold value, it is determined that there is a possibility that the concentration polarization due to overcharging may occur and the battery is deteriorated, and the pulse charging is terminated. Is known.

JP 2008-181866 A

  However, when the technology that limits the generation of concentration polarization by limiting the charging current and discharging current of the battery is applied to an electric vehicle, the motor / generator functions as a motor with the current from the battery. When the battery is charged by functioning as a generator, the charge / discharge current is limited, and the merchantability of the electric vehicle may be greatly reduced.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to suppress the occurrence of concentration polarization of a battery without being limited by the charge / discharge current.

  To achieve the above object, according to the first aspect of the present invention, the concentration polarization calculating means for calculating the concentration polarization of the battery and the average concentration polarization which is an average value per unit time of the concentration polarization are calculated. A battery comprising: an average concentration polarization calculating means for performing determination; a concentration polarization reduction necessity determining means for determining whether or not to reduce the concentration polarization of the battery based on the average concentration polarization; and a battery temperature control means for heating the battery. When the battery temperature control means determines that the concentration polarization needs to be reduced, the battery temperature control means heats the battery. Proposed.

  According to the invention described in claim 2, in addition to the configuration of claim 1, it further includes charge / discharge control means for limiting a charge / discharge current of the battery, and the average concentration polarization is greater than or equal to a first threshold value. The battery temperature control means warms the battery when it is less than a second threshold value that is greater than the first threshold value, and the charge / discharge control means charges or discharges the battery when the average concentration polarization is greater than or equal to the second threshold value. A battery temperature management device is proposed which is characterized in that the current of the battery is limited.

  According to a third aspect of the present invention, in addition to the configuration of the first aspect, the battery temperature control means prohibits the heating when the temperature of the battery is equal to or higher than a predetermined value. A battery temperature management device is proposed.

  According to the invention described in claim 4, in addition to the configuration of claim 1, it further comprises continuous charge / discharge time acquisition means for acquiring the continuous charge / discharge time of the battery, and the concentration polarization reduction necessity determination means comprises A battery temperature management device is proposed in which it is determined whether or not the concentration polarization of the battery needs to be reduced based on the average concentration polarization and the continuous charge / discharge time.

  According to the invention described in claim 5, in addition to the configuration of claim 4, the concentration polarization reduction necessity determination unit is configured to perform the determination based on a map indicating a relationship between the average concentration polarization and the continuous charge / discharge time. A battery temperature management device is proposed in which it is determined whether or not the concentration polarization of the battery needs to be reduced, and the map is set such that the average concentration polarization that can be tolerated decreases as the continuous charge / discharge time increases. Is done.

  The timer 25 of the embodiment corresponds to the continuous charge / discharge time acquisition means of the present invention.

  According to the configuration of the first aspect, the concentration polarization calculating means calculates the concentration polarization of the battery, the average concentration polarization calculating means calculates the average concentration polarization that is an average value per unit time of the concentration polarization, and concentration polarization reduction is required. The rejection determination means determines whether or not the concentration polarization of the battery needs to be reduced based on the average concentration polarization. If the concentration polarization reduction necessity determination means determines that the concentration polarization needs to be reduced, the battery temperature control means heats the battery, so that the occurrence of concentration polarization is suppressed without limiting the charge / discharge current of the battery. And the influence on the charge / discharge characteristics of the battery can be minimized.

  According to the second aspect of the present invention, when the average concentration polarization is greater than or equal to the first threshold and less than the second threshold greater than the first threshold, the battery is heated by the battery temperature control means to generate concentration polarization. If the average concentration polarization exceeds the second threshold even when the battery is heated, the charge / discharge control means limits the charge / discharge current of the battery to further increase the concentration polarization. Progress can be suppressed.

  According to the third aspect of the present invention, since the battery temperature control means prohibits heating when the temperature of the battery is equal to or higher than a predetermined value, the temperature of the battery is excessively increased by the heating and causes permanent deterioration. Can be prevented.

  According to the configuration of claim 4, the continuous charge / discharge time of the battery is acquired by the continuous charge / discharge time acquisition means, and the concentration polarization reduction necessity determination means determines the concentration polarization of the battery based on the average concentration polarization and the continuous charge / discharge time. Therefore, when the continuous charge / discharge time is short, unnecessary heating is not necessarily performed, and the frequency of heating is reduced.

  According to the fifth aspect of the present invention, the concentration polarization reduction necessity determination means determines whether or not the concentration polarization needs to be reduced based on a map indicating the relationship between the average concentration polarization and the continuous charge / discharge time. Since the allowable average concentration polarization becomes smaller as the discharge time becomes longer, it is determined that the concentration polarization needs to be reduced early when the concentration polarization tends to proceed because the continuous charge / discharge time is long. In addition, the progress of concentration polarization can be reliably suppressed.

The block diagram which shows the whole structure of the temperature management apparatus of a battery. (First embodiment) The flowchart of a main routine. (First embodiment) The flowchart of the subroutine of step S1 of the main routine. (First embodiment) The flowchart of the subroutine of step S2 of the main routine. (First embodiment) The flowchart of the subroutine of step S3 of the main routine. (First embodiment) The block diagram which shows the whole structure of the temperature management apparatus of a battery. (Second Embodiment) The flowchart of the subroutine of step S3 of the main routine. (Second Embodiment) Explanatory drawing of the method of calculating the average density | concentration polarization upper limit for the average density | concentration polarization and continuous charging / discharging time not exceeding the electric current limit control intervention line. (Second Embodiment) The map which searches the combination of the 2nd electric current value and permissible energization time from an average concentration polarization upper limit. (Second Embodiment)

First embodiment

  Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, an electric vehicle or a hybrid vehicle includes a battery 11 formed of a lithium ion battery that can be charged and discharged. The battery 11 is connected to a motor / generator (not shown). The battery 11 supplies electric power to the motor / generator to generate running torque and torque for assisting the engine. At the same time, the battery 11 uses electric power generated by the motor / generator by regenerative braking. Charged. A battery ECU 12 that controls charging / discharging of the battery 11 includes a battery temperature sensor 13 that detects the temperature of the battery 11, a battery current sensor 14 that detects the current of the battery 11, and a battery voltage sensor 15 that detects the voltage of the battery 11. Based on the signal from, the heating of the battery 11 is controlled in order to prevent the battery 11 from causing a temporary increase in resistance due to concentration polarization.

  The battery ECU 12 includes an SOC calculation unit 21, an SOC-OCV map 22, a resistance calculation unit 23, a concentration polarization calculation unit 24, a timer 25, an average concentration polarization calculation unit 26, and a concentration polarization reduction necessity determination unit 27. And a battery temperature control means 28. Here, SOC: State of Charge is the remaining capacity of the battery 11, and OCV: Open Circuit Voltage is the open voltage of the battery 11. The battery temperature control means 28 is connected to the battery heating fan 31 via the fan control device 30 and heats the battery storage chamber via the air conditioner control device 32 in order to warm the battery 11 and increase the temperature. Connected to the air conditioner 33.

  Next, the outline of the temperature control and charge / discharge control of the battery 11 will be described based on the block diagram of FIG. 1 and the flowcharts of FIGS.

  First, the concentration polarization of the battery 11 is calculated by the concentration polarization calculating means 24 in step S1 of the flowchart of the main routine of FIG. When the current is taken out from the battery, the terminal voltage of the battery becomes smaller than the electromotive force. This phenomenon is called polarization, or the amount of decrease in battery terminal voltage caused by this phenomenon is called polarization. Concentration polarization is a kind of polarization described above. For example, in a lithium ion battery, the lithium ion concentration in the electrolyte is decreased on the positive electrode side and increased on the negative electrode side due to charge / discharge at a high rate, so that the internal resistance of the battery increases. As a result, the terminal voltage decreases.

  The flowchart of FIG. 3 shows the subroutine of step S1. First, the OCV of the battery 11 is acquired in step S11. That is, the SOC calculation means 21 calculates the SOC from the battery current detected by the battery current sensor 14 and calculates the OCV by applying the SOC and the battery temperature detected by the battery temperature sensor 13 to the SOC-OCV map 22. . The SOC calculation means 21 integrates the battery current detected by the battery current sensor 14 every predetermined time to calculate the integrated charge amount and the integrated discharge amount, and calculates the integrated charge amount and the integrated discharge amount in the initial state or immediately before the start of charge / discharge. The SOC is calculated by adding or subtracting to the SOC (initial SOC). Further, the OCV can be calculated with higher accuracy by changing the SOC-OCV map 22 according to the battery temperature.

  The OCV corresponds to the terminal voltage when the battery 11 is not charging / discharging. Therefore, when the battery 11 is not charging / discharging, the value detected by the battery voltage sensor 15 is the terminal voltage at that time. It can be used as OCV.

  In subsequent step S12, the instantaneous resistance R1 of the battery 11 is acquired by the resistance calculating means 23. In other words, the battery instantaneous resistance R1 is calculated by applying statistical processing such as a least square method to the amount of change in the battery voltage detected by the battery voltage sensor 15 and the amount of change in the battery current detected by the battery current sensor 14. . In subsequent step S13, the concentration polarization Vc of the battery 11 is calculated by Vc = OCV−V−I * R1. Here, V is the battery voltage detected by the battery voltage sensor 15, and I is the battery current detected by the battery current sensor 14. At this time, if the battery temperature detected by the battery temperature sensor 13 is taken into consideration, the concentration polarization Vc can be calculated with higher accuracy.

  Returning to the main routine of FIG. 2, the average concentration polarization of the battery 11 is acquired by the average concentration polarization calculating means 26 in step S2.

  The flowchart of FIG. 4 shows the subroutine of step S2. First, in step S21, the concentration polarization Vc of the battery 11 is acquired from the concentration polarization calculation means 24. In step S22, the concentration polarization Vc is converted into an absolute value, and then in step S23, the integrated concentration polarization ∫Vc (k + 1) of the battery 11 is calculated by に よ り Vc (k + 1) = Vc + ∫Vc (k). That is, by adding the concentration polarization Vc of the current loop to the integrated concentration polarization ∫Vc (k) of the previous loop, the integrated concentration polarization ∫Vc (k + 1) of the current loop is calculated. In subsequent step S24, the continuous charge / discharge time t during which the battery current is flowing is measured by the timer 25, and in step S25, the average concentration polarization AVE. Vc, AVE. Vc = [∫Vc (k + 1)] / t. The reason why the concentration polarization Vc is converted to an absolute value in the step S22 is that the sign of the concentration polarization Vc is different between positive and negative at the time of charging and discharging. AVE. This is because Vc cannot be calculated correctly.

  Returning to the main routine of FIG. 2, the average concentration polarization AVE. The necessity of control for reducing Vc is determined, and the average concentration polarization AVE. If it is determined that Vc needs to be reduced, the battery 11 is heated by the battery temperature control means 28.

  The flowchart of FIG. 5 shows the subroutine of step S3. First, in step S31, the average concentration polarization AVE. Obtain Vc. In subsequent step S32, the timer 25 counts the continuous charge / discharge time t during which the current flows in the battery 11, and in step S33 the average concentration polarization-continuous charge / discharge time map stored in the concentration polarization reduction necessity determination means 27 stores the average concentration. Polarization AVE. Vc and continuous charge / discharge time t are applied. The average concentration polarization-continuous charge / discharge time map shows the average concentration polarization AVE. Vc is taken and a horizontal charge / discharge time t is taken on the horizontal axis, and a battery heating control intervention line is set there.

  The battery heating control intervention line shows that when the continuous charge / discharge time t increases, the average concentration polarization AVE. Vc decreases, and conversely, the average concentration polarization AVE. It is set so that the continuous charge / discharge time t decreases as Vc increases. And average concentration polarization AVE. When the point indicated by Vc and the continuous charge / discharge time t crosses the battery warming control intervention line from the origin side to the non-origin side, it is determined that there is a possibility that the battery 11 may temporarily increase in resistance due to concentration polarization. Then, the battery 11 is heated to suppress the occurrence of concentration polarization.

  That is, in the subsequent step S34, the average concentration polarization AVE. When Vc is equal to or greater than the first threshold and the continuous charge / discharge time is equal to or greater than the first threshold, that is, the average concentration polarization AVE. If Vc and the continuous charge / discharge time exceed the battery warming control intervention line to the opposite origin side, the battery temperature is acquired by the battery temperature sensor 13 in step S35, and the battery temperature is set to the battery protection temperature (eg, 55) in step S36. If the temperature is lower than the battery protection temperature, the battery 11 is heated by the battery temperature control means 28 in step S37.

  Specifically, the fan control device 30 drives the fan 31 to send warm air to the battery 11 to heat it, or the air conditioner control device 32 controls the air conditioner 33 to raise the temperature of the battery storage chamber. 11 is warmed. When the temperature of the battery 11 rises due to heating, the electrochemical reaction at the electrode of the battery 11 is promoted, so that the occurrence of concentration polarization is suppressed.

  As described above, in the present embodiment, when the concentration polarization reduction necessity determination unit 27 determines that the concentration polarization needs to be reduced, the battery temperature control unit 28 heats the battery 11. The occurrence of concentration polarization can be suppressed without limiting the discharge current, and the influence on the charge / discharge characteristics of the battery 11 can be suppressed to the minimum, thereby increasing the commerciality of the electric vehicle or hybrid vehicle.

  Further, since the battery temperature control means 28 prohibits heating when the temperature of the battery 11 is equal to or higher than the battery protection temperature, it prevents the temperature of the battery 11 from excessively rising due to heating and causing permanent deterioration. can do.

  Further, since the concentration polarization reduction necessity determination means 27 determines whether or not the concentration polarization of the battery 11 needs to be reduced based on the average concentration polarization and the continuous charge / discharge time, heating that is not necessarily required when the continuous charge / discharge time is short is performed. It can be avoided and the frequency of warming can be reduced. At this time, the concentration polarization reduction necessity determining means 27 determines whether or not the concentration polarization needs to be reduced based on an average concentration polarization-continuous charge / discharge time map showing the relationship between the average concentration polarization and the continuous charge / discharge time. Since the allowable average concentration polarization becomes smaller as the continuous charge / discharge time becomes longer, it is necessary to reduce the concentration polarization earlier when the concentration polarization tends to proceed because the continuous charge / discharge time is longer. And the progress of concentration polarization can be suppressed.

Second embodiment

  In the first embodiment described above, the battery 11 is heated when it is necessary to reduce the concentration polarization. However, in the second embodiment, the concentration polarization is performed even when the battery 11 is heated. Is not sufficiently reduced, the concentration polarization is reduced by limiting the charge / discharge current of the battery 11.

  As shown in FIG. 6, the second embodiment includes charge / discharge control means 29 connected to the concentration polarization reduction necessity determination means 27, and the charge / discharge control means 29 is the charge current and discharge of the battery 11. Concentration polarization is reduced by limiting the current.

  FIG. 7 is a flowchart of the concentration polarization reduction routine according to the second embodiment. As is clear from the flowchart of the first embodiment (see FIG. 5), the second embodiment includes steps S33 and S33. The contents of step S34 are different and are different in that step S38 and step S39 are added.

  In step S33, the average concentration polarization-continuous charging / discharging time map stored in the concentration polarization reduction necessity determining unit 27 has the current limit control intervention line set on the opposite side of the battery heating control intervention line, and further the current limit control. An I / O inhibition line is set on the opposite side of the intervention line. Control that regulates the maximum current value of charge / discharge is executed in a region sandwiched between the battery heating control intervention line and the current limit control intervention line, and the average concentration polarization AVE. When the point indicated by Vc and the continuous charge / discharge time t crosses the input / output inhibition line from the origin side to the non-origin side, it is determined that a temporary increase in resistance has already occurred in the battery 11 and the battery 11 is charged. Discharge is prohibited.

  In subsequent step S34, the average concentration polarization AVE. When Vc is greater than or equal to the first threshold and less than the second threshold, and the continuous charge / discharge time t is greater than or equal to the first threshold and less than the second threshold, that is, the average concentration polarization AVE. If Vc and continuous charge / discharge time t are between the battery warming control intervention line and the current limit control intervention line, the battery temperature is acquired by the battery temperature sensor 13 in step S35, and the battery temperature is set to the battery protection temperature ( For example, if it is less than the battery protection temperature, the battery 11 is heated by the battery temperature control means 28 in step S37.

  On the other hand, the average concentration polarization AVE. When Vc is equal to or greater than the first threshold and not less than the second threshold, or when the continuous charge / discharge time t is equal to or greater than the first threshold and not less than the second threshold, the average concentration polarization AVE. If Vc is equal to or greater than the second threshold and the continuous charge / discharge time t is equal to or greater than the second threshold, that is, the average concentration polarization AVE. If Vc and the continuous charge / discharge time t exceed the current limit control intervention line on the side opposite to the origin, the charge / discharge current of the battery 11 is limited in step S39. That is, the maximum value of the charging / discharging current of the battery 11 at normal time is only limited to the first current value according to the SOC of the battery 11, but when the charging / discharging current of the battery 11 is limited. The maximum value of the charging / discharging current of the battery 11 is limited to a second current value smaller than the first current value.

  In FIG. 8, the average concentration polarization AVE. When Vc and continuous charge / discharge time t change along the broken line, it is assumed that the current limit control intervention line crosses from the origin side to the non-origin side at point A. A point where a line extending parallel to the horizontal axis through point A intersects with the input / output inhibition line is defined as B point, and a point extending through the point B parallel to the vertical axis intersects with the current limiting control intervention line is defined as C. Point, the average concentration polarization AVE. If Vc is decreased at a predetermined decrease rate, the average concentration polarization AVE. Vc can be maintained closer to the origin than the current limit control intervention area.

  The time at point A is a, the time at points B and C is b, and the average concentration polarization AVE. Vc is c, and average concentration polarization AVE. When Vc is d, the concentration polarization at point A (ie time a) is given by d × a, and the concentration polarization at point C (ie time b) is given by c × b. Average concentration polarization AVE. Time change rate ΔAVE. Of average concentration polarization for changing Vc from point A to point C Vc is calculated by dividing the difference obtained by subtracting the concentration polarization at point A (ie, d × a) from the concentration polarization at point C (ie, c × b) by the time ba from point A to point B. The

ΔAVE. Vc = {(c × b) − (d × a)} / (b−a)
In the above formula, for example, if a = 60 min, b = 120 min, c = 60 mV, d = 80 mV,
ΔAVE. Vc = {(60 × 120) − (80 × 60)} / (120-60)
= 40 (mV / min)
And the time change rate ΔAVE. Vc is defined as the average concentration polarization upper limit value Vc (DOWN). Therefore, the average concentration polarization AVE. With the average concentration polarization upper limit Vc (DOWN). If Vc is reduced, the average concentration polarization AVE. Vc and continuous charge / discharge time t can be maintained closer to the origin than the control intervention line.

  The current value-allowable energization time map of FIG. 9 is obtained by taking the current value on the vertical axis and the allowable energization time on the horizontal axis, and there is an average concentration polarization upper limit Vc (DOWN) at a battery temperature of 25 ° C. A 40 m line, a 50 mV line, and a normal use line are shown. The fact that the average concentration polarization upper limit Vc (DOWN) is small means that in order to eliminate concentration polarization, it is necessary to make the maximum current value for charging / discharging smaller and the allowable energization time shorter. The characteristic line approaches the origin. Further, since the concentration polarization is easily eliminated when the battery temperature is high, for example, the 40 mV line at 30 ° C. moves to the opposite origin side than when the battery temperature is 25 ° C.

  When the average concentration polarization upper limit Vc (DOWN) is 40 mV at a battery temperature of 25 ° C., if the charge / discharge current value is high I1, the allowable energization time is t1, and the charge / discharge current value is moderate I2. If this is the case, the allowable energization time is medium t2, and if the charge / discharge current value is low I3, the allowable energization time is long t3. Therefore, the maximum current value supplied to the battery 11 and the allowable energization time are related to each other so that the predetermined average concentration polarization upper limit value Vc (DOWN) line in the current value-allowable charge / discharge time map does not exceed the anti-origin side. Thus, the concentration polarization of the battery 11 can be reliably suppressed to prevent a sudden voltage drop.

  As described above, according to the present embodiment, the average concentration polarization AVE., Which is the average value per unit time of the concentration polarization Vc of the battery 11. When Vc is equal to or greater than the second threshold and the continuous charge / discharge time t during which the battery 11 is continuously charged / discharged is equal to or greater than the second threshold, it is determined that further reduction of the concentration polarization is necessary, and the battery 11 is reduced from the first current value to a current value of 2 that is smaller than the first current value, so that the current is reduced before the battery 11 is charged / discharged with an excessive current and the concentration polarization increases. The voltage drop due to the increase in the internal resistance of the battery 11 can be minimized.

  Further, since the charge / discharge control means 29 sets the second current value to a higher value as the battery temperature is higher, the second current value is set to a higher value when the battery 11 is hot and the concentration polarization is easily eliminated. To avoid unnecessary current limitation and maximize the performance of the battery 11.

  The charge / discharge control means 29 sets the allowable charge / discharge time that can be charged / discharged at the second current value in addition to the second current value that is the maximum current value that can charge / discharge the battery 11. Even when the charging / discharging current temporarily exceeds the second current value due to a sensor error or the like, unnecessary current limitation can be prevented each time. Moreover, the current value-allowable energization time map of the charge / discharge control means 29 is set so that the allowable charge / discharge time is shortened as the second current value is increased. Even when the battery 11 is used in a mode in which the time is short or in a mode in which the current value is low but the energization time is long like an electric vehicle, the combination of the current value and the allowable energization time can be set flexibly. Become.

  The embodiments of the present invention have been described above, but various design changes can be made without departing from the scope of the present invention.

  For example, the battery of the present invention is not limited to a lithium ion battery, and its use is not limited to an electric vehicle and a hybrid vehicle.

11 Battery 24 Concentration polarization calculation means 25 Timer (continuous charge / discharge time acquisition means)
26 Average concentration polarization calculation means 27 Concentration polarization reduction necessity determination means 28 Battery temperature control means 29 Charge / discharge control means

Claims (5)

Concentration polarization calculating means (24) for calculating concentration polarization of the battery (11);
Average concentration polarization calculating means (26) for calculating an average concentration polarization which is an average value per unit time of the concentration polarization;
Concentration polarization reduction necessity determining means (27) for determining whether or not the concentration polarization of the battery (11) needs to be reduced based on the average concentration polarization;
A battery temperature management device comprising battery temperature control means (28) for heating the battery (11),
The battery temperature control means (28) heats the battery (11) when the concentration polarization reduction necessity determination means (27) determines that concentration polarization reduction is necessary. Temperature management device. Charge / discharge control means (29) for limiting the charge / discharge current of the battery (11);
When the average concentration polarization is greater than or equal to a first threshold value and less than a second threshold value that is greater than the first threshold value, the battery temperature control means (28) heats the battery (11), and the average concentration polarization is greater than the first threshold value. The battery temperature management device according to claim 1, wherein the charge / discharge control means (29) limits a charge / discharge current of the battery (11) when the threshold value is two or more.   The battery temperature control device according to claim 1, wherein the battery temperature control means (28) prohibits the heating when the temperature of the battery (11) is a predetermined value or more. A continuous charge / discharge time acquisition means (25) for acquiring the continuous charge / discharge time of the battery (11);
The concentration polarization reduction necessity determination means (27) determines whether or not the concentration polarization of the battery (11) needs to be reduced based on the average concentration polarization and the continuous charge / discharge time. The battery temperature management device described.   The concentration polarization reduction necessity determination means (27) determines whether or not the concentration polarization of the battery (11) needs to be reduced based on a map showing the relationship between the average concentration polarization and the continuous charge / discharge time, and the map The battery temperature management device according to claim 4, wherein the average concentration polarization that can be tolerated decreases as the continuous charge / discharge time increases.

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