JP2014121213A - Electrical power system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrical power system capable of suppressing a wasteful power consumption for equalization of battery cells that constitute a battery pack.SOLUTION: An electrical power system includes: a voltage detection circuit 312 for detecting a cell voltage of each of battery cells 200 in a battery pack 20; equalization determination means 32b for determining the necessity of equalization of storage capacity in each of the battery cells 200; discharge object determination means 32c for determining a discharge target battery cell 200 for executing equalization of storage capacity for each of the battery cells 200; a temperature control component 41 for adjusting the temperature of an on-vehicle apparatus 40 to which an electric power is supplied from each of the battery cells 200; a temperature control driving member 42 for selectively switching an electrical connection between each of the battery cells 200 and the temperature control component 41; and temperature control means 32d for controlling the temperature control driving member 42. When it is determined that the storage capacity for each of the battery cells 200 requires equalization, the temperature control means 32d controls the temperature control driving member 42 so as to connect the battery cell 200 determined to be the target for discharging to the temperature control component 41.

Description

  The present invention relates to a power supply system including an assembled battery including a plurality of battery cells.

  Conventionally, an assembled battery including a plurality of battery cells is mounted on a hybrid vehicle (HV), a plug-in hybrid vehicle (PHV), an electric vehicle (EV), or the like as a large-capacity battery that supplies power to a traveling motor. Yes.

  In this assembled battery, when charging and discharging of each battery cell is repeated, the storage capacity (SOC: State Of Charge) of each battery cell varies due to the influence of individual differences between battery cells, environmental temperature, and the like. When such a variation occurs, the amount of charge at the time of charging and the amount of discharge at the time of discharging are limited, and the storage capacity of the entire assembled battery may be greatly reduced.

  For this reason, the monitoring device for monitoring the state of the assembled battery is provided with a circuit for connecting each terminal of each battery cell and the resistor in parallel to discharge each battery cell individually. A configuration for equalizing voltage variation is known (see, for example, Patent Document 1).

JP 2012-10562 A

  However, as described in Patent Document 1, when a battery is connected in parallel to a battery cell having a higher storage capacity than others, and the battery cells are equalized, the energy stored in the battery cells is reduced. There is a problem that it is wasted.

  An object of this invention is to provide the power supply system which can suppress the useless power consumption at the time of equalization of the battery cell which comprises an assembled battery in view of the said point.

  In order to achieve the above object, according to the first aspect of the present invention, an assembled battery (20) composed of a plurality of battery cells (200) and a voltage detection means (312) for detecting the voltage of each of the plurality of battery cells. And equalization determination means (32b) for determining the necessity of equalization of the storage capacity in the plurality of battery cells based on the detection voltage by the voltage detection means, and equalization of the storage capacity is required by the equalization determination means The discharge target determining means (32c) for determining at least one battery cell to be discharged from the plurality of battery cells, and temperature control using at least one of the plurality of battery cells as a power source. A temperature adjustment member (41) that adjusts the temperature of the object (20, 40, CS), and a temperature adjustment drive member (42) that selectively switches the electrical connection relationship between the plurality of battery cells and the temperature adjustment member. ) And warm Temperature control means (32d) for controlling the drive member, and when the equalization determination means determines that the storage capacity needs to be equalized, the temperature control means is set as a discharge target by the discharge target determination means. The temperature control drive member is controlled so that the determined battery cell is connected to the temperature adjustment member.

  According to this, since the electric power at the time of equalization of the battery cells constituting the assembled battery is effectively used for temperature adjustment of the temperature adjustment object, it is possible to suppress wasteful power consumption at the time of equalization of the battery cells. It becomes.

  According to a second aspect of the present invention, the power supply system according to the first aspect further comprises temperature detecting means (43) for detecting the temperature of the temperature control object, wherein the temperature control means is an equalization determining means. When the storage capacity is determined to be equalized and the temperature detected by the temperature detection means is out of the predetermined appropriate temperature range, the temperature of the battery cell determined as the discharge target by the discharge target determination means is adjusted. The temperature control drive member is controlled so as to be connected to the member.

  According to this, the electric power at the time of equalization of the battery cells constituting the assembled battery can be effectively used for temperature adjustment of the temperature adjustment object when the temperature of the temperature adjustment object is out of the appropriate temperature range. .

  According to a fifth aspect of the present invention, in the power supply system according to any one of the second to fourth aspects, the temperature control object is composed of at least some of the battery cells. The temperature adjusting member is characterized in that it is disposed so as to be in thermal contact with the battery cells constituting the temperature adjustment object.

  According to this, since the temperature of the battery cell can be appropriately adjusted by using the power at the time of equalization of the battery cells constituting the assembled battery, there is a problem in using the battery cell outside the appropriate temperature range. It is possible to suppress deterioration and performance degradation. Note that “thermal contact” is not limited to a direct contact state, but indirectly through a member that easily moves heat (for example, a connecting member having heat conductivity) or a space. It is meant to include the state of being.

  In addition, the code | symbol in the parenthesis of each means described in this column and the claim shows an example of a correspondence relationship with the specific means described in the embodiment described later.

1 is an overall configuration diagram of a power supply system according to a first embodiment. It is a perspective view which shows the external appearance of the battery unit which concerns on 1st Embodiment. It is a perspective view of the battery stack concerning a 1st embodiment. It is a block diagram of a monitoring device concerning a 1st embodiment. It is a flowchart which shows the flow of the control processing which the monitoring control apparatus which concerns on 1st Embodiment performs. It is a flowchart which shows the flow of the temperature adjustment process which the monitoring control apparatus which concerns on 1st Embodiment performs. It is explanatory drawing for demonstrating equalization of the electrical storage capacity of each battery cell. It is explanatory drawing for demonstrating equalization of the electrical storage capacity of each battery cell. It is explanatory drawing for demonstrating the relationship between the battery output of a battery cell, and battery temperature. It is explanatory drawing for demonstrating the relationship between the battery input of a battery cell, and battery temperature. It is a perspective view of the battery stack which concerns on 2nd Embodiment. It is a perspective view of the battery stack which concerns on 3rd Embodiment. It is a schematic diagram which shows the edge part of the battery stack which concerns on 3rd Embodiment. It is a perspective view which shows the modification of arrangement | positioning of the temperature adjustment member which concerns on 3rd Embodiment. It is a perspective view of the battery stack which concerns on 4th Embodiment. It is a schematic diagram which shows the edge part of the battery stack which concerns on 4th Embodiment. It is a perspective view which shows the external appearance of the battery unit which concerns on 5th Embodiment. It is a perspective view which shows the arrangement configuration of the battery pack which concerns on 6th Embodiment. It is a perspective view which shows the modification of arrangement | positioning of the temperature control member which concerns on 6th Embodiment. It is a perspective view which shows the arrangement configuration of the battery pack which concerns on 7th Embodiment. It is a flowchart which shows the flow of the control processing which the monitoring control apparatus which concerns on 8th Embodiment performs. It is a flowchart which shows the flow of the temperature distribution suppression process which the monitoring control apparatus which concerns on 8th Embodiment performs. It is a flowchart which shows the flow of the temperature distribution suppression process which the monitoring control apparatus which concerns on 9th Embodiment performs. It is a flowchart which shows the flow of the temperature distribution suppression process which the monitoring control apparatus which concerns on 10th Embodiment performs.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
First, the first embodiment will be described. In the present embodiment, an example will be described in which the power supply system of the present invention is applied to a plug-in hybrid vehicle (PHV) in which a driving source for driving a vehicle includes a driving motor and an engine.

  The power supply system 1 according to the present embodiment is connected to the inverter 6 of the motor generator MG via the motor-side relays 500 and 510 and charged via the charging-side relays 520 and 530, as shown in the overall configuration diagram of FIG. Connected to the device 7. The charger 7 charges a battery pack 20 to be described later using a commercial power source such as a home or a desk lamp.

  The power supply system 1 mainly includes a battery unit 2 having the battery pack 20 as an assembled battery, a battery monitoring unit 3 for monitoring a storage state of each battery cell 200 constituting the battery pack 20, and an in-vehicle device 40 other than the battery pack 20. Is provided with a temperature adjustment unit 4 for adjusting the temperature as a temperature control object, and a current detection sensor 34 for detecting a current flowing in and out of the battery pack 20. As the in-vehicle device 40, it is assumed that an internal combustion engine (engine), a heat exchanger (evaporator or condenser) for air conditioning in a vehicle interior, etc., a regenerator that stores cold heat or heat, etc. Yes.

  As shown in the perspective view of FIG. 2, the battery unit 2 includes a battery case 21 and a battery pack 20 accommodated in the battery case 21. The battery pack 20 of this embodiment is connected to an external structure via a metal or resin bracket 21 a provided on the outer periphery of the battery case 21. The bracket 21a in the battery case 21 constitutes a pack connecting member having heat conductivity.

  In addition, the battery pack 20 of the present embodiment is configured by a plurality of battery stacks CS in which the respective battery cells 200 are stacked in a predetermined number unit in consideration of mountability on a vehicle and the like. For convenience of explanation, FIG. 2 shows an example in which three battery stacks CS are accommodated in the battery case 21, but the number of battery stacks CS constituting the battery pack 20 is not limited to three.

  As shown in FIG. 3, the battery stack CS is constrained between the positions of the battery cells 20 by the stack restraining member 201 and is made of metal or resin stays provided at both ends in the stacking direction of the battery stack CS. It is connected to an external structure not shown through 202. The stay 202 constitutes a stack connecting member having heat conductivity.

  Returning to FIG. 1, the battery pack 20 is configured as a series connection body in which a plurality of battery cells 200 are electrically connected in series. Each battery cell 200 is a secondary battery that is a minimum unit of monitoring and control, and is constituted by, for example, a lithium ion battery, a nickel metal hydride battery, or a lead battery.

  The battery cells 200 of the present embodiment are grouped as a battery block CB for each predetermined unit number for monitoring and control. Note that the battery block CB is used to partition each battery cell 200 in units of monitoring and control, and is different from the battery stack SC that partitions each battery cell 200 in a stack unit.

  For convenience of explanation, FIG. 1 illustrates an example in which four battery cells 200 are used as one battery block CB, but the number of battery cells 200 constituting the battery block CB is not limited to four. Each battery block CB may be composed of an equal number of battery cells 200 or a different number of battery cells 200.

  The battery monitoring unit 3 includes a plurality of monitoring devices 31 corresponding to each battery block CB, a monitoring control device 32 that controls each monitoring device 31, a voltage detection sensor 33 that detects the total voltage of the battery pack 20, and the like. Yes.

  Each monitoring device 31 is connected to the corresponding battery block CB via a detection line connected to both terminals of the battery cell 200. Each of the monitoring devices 31 is configured to operate by feeding power from the corresponding battery block CB.

  Each monitoring device 31 is connected in a daisy chain manner so that adjacent monitoring devices 31 can transmit signals. Among the monitoring devices 31, the monitoring devices 31 corresponding to the battery block CB on the highest potential side and the lowest potential side. Is connected to the monitoring control device 32 via an insulating unit 35 such as a photocoupler. The signal transmitted from the monitoring control device 32 is sequentially input to each monitoring device 31 via the monitoring device 31 connected to the monitoring control device 32.

  Here, details of the monitoring device 31 will be described with reference to the block diagram of FIG. As shown in FIG. 4, the monitoring device 31 includes an equalization circuit 311, a voltage detection circuit 312, a switch switching circuit 313, a signal input / output circuit 314, and the like.

  The equalization circuit 311 is a circuit that suppresses cell voltage variation in the battery block CB, and is a series connection body of a discharge resistor 311a and a short-circuit switch 311b that short-circuits both terminals of the battery cell 200 to discharge. It is configured. In the equalization circuit 311, when the short-circuit switch 311 b is turned on and both terminals of the battery cell 200 are short-circuited, a current flows through the resistor 311 a and the electric energy of the battery cell 200 is released as heat by the resistor 311 a. .

  The voltage detection circuit 312 is voltage detection means that detects a potential difference between detection lines connected to both terminals of each battery cell 200 as a cell voltage of the battery cell 200. In the present embodiment, a voltage detection circuit 312 that detects a cell voltage of a single battery cell 200 is adopted, and the battery cell 200 that is a voltage detection target is switched in a predetermined order, whereby the cell of each battery cell 200 is detected. The voltage is detected. Note that the voltage detection circuit 312 can be constituted by an AD converter capable of detecting a voltage, for example.

  The switch switching circuit 313 is a circuit that switches on / off of each short-circuit switch 311b of the equalization circuit 311 and is configured to switch on / off of the short-circuit switch 311b in accordance with a control signal from a monitoring control device 32 described later.

  The signal input / output circuit 314 is a circuit that inputs / outputs a control signal and a detection signal to / from the monitoring control device 32 or the adjacent monitoring device 31. The signal input / output circuit 314 of this embodiment is connected to the voltage detection circuit 312 and the switch switching circuit 313. Note that in the signal input / output circuit 314, an output side circuit and an input side circuit may be configured independently.

  Returning to FIG. 1, the monitoring control device 32 includes a CPU, a microcomputer including various memories 32 a constituting a storage unit, and peripheral devices thereof, and executes various processes according to a control program stored in the memory 32 a. It is configured. Note that the monitoring control device 32 is driven by power storage means other than the battery pack 20 (for example, an on-board auxiliary battery) as a power source. The monitoring control device 32 is connected to a vehicle control device 8 described later so as to be capable of bidirectional communication.

  A voltage detection circuit 312, a voltage detection sensor 33, a current detection sensor 34, a temperature detection unit 43 of the temperature adjustment unit 4, which will be described later, and the like are connected to the input side of the monitoring control device 32 through a signal input / output circuit 314. The sensor signals from various sensors can be acquired.

  Further, a switch switching circuit 313, a temperature adjustment drive member 42 of a temperature adjustment unit 4 to be described later, and the like are connected to the output side of the monitoring control device 32 via a signal input / output circuit 314, and each control device is connected to the output side. The control signal can be output.

  The monitoring control device 32 of the present embodiment determines whether or not it is necessary to equalize the storage capacity (charge amount) in each battery cell 200 based on the detection voltage of each battery cell 200 detected by the voltage detection circuit 312. A process for determining the battery cell 200 to be discharged is executed.

  In addition, the monitoring control device 32 of the present embodiment is configured to execute a process of adjusting the temperature of the in-vehicle device 40 by controlling a temperature adjustment driving member 42 described later and changing the temperature of the temperature adjustment member 41. Has been.

  In the present embodiment, the configuration for determining whether or not the storage capacity equalization is necessary in the monitoring control device 32 constitutes the equalization determination means 32b, and the configuration for determining the battery cell to be discharged from each battery cell 200. The discharge target determining means 32c is configured. Further, in the present embodiment, the configuration for controlling the temperature adjustment drive member 42 in the monitoring control device 32 constitutes the temperature adjustment control means 32d.

  The temperature adjustment unit 4 adjusts the temperature of the in-vehicle device 40 that constitutes the temperature adjustment object, using at least a part of each battery cell 200 constituting the battery pack 20 as a power source. The temperature adjustment unit 4 of the present embodiment mainly includes a temperature adjustment member 41, a temperature adjustment drive member 42, and a temperature detection unit 43 that detects the temperature of the in-vehicle device 40.

  The temperature adjustment member 41 adjusts the temperature of the in-vehicle device 40. The temperature adjustment member 41 of the present embodiment includes a heating unit 411 that dissipates and heats the vehicle-mounted device 40 by power supply, and a cooling unit 412 that absorbs heat from the vehicle-mounted device 40 by power supply and cools it. In the present embodiment, the heating unit 411 is configured with an electric heater, and the cooling unit 412 is configured with a thermoelectric element such as a Peltier element.

  Here, the heating unit 411 includes an electric heater that exhibits a heat dissipation function by power feeding, and an electric heater in order to suppress its own temperature variation or suppress its own temperature from being lower than the appropriate temperature of the in-vehicle device 40. You may comprise with the thermal storage member (illustration omitted) which stores the heat of a heater. In addition, the cooling unit 412 includes a thermoelectric element that exhibits an endothermic function by power feeding in order to suppress its own temperature variation or suppress its own temperature from becoming higher than the appropriate temperature of the in-vehicle device 40, and a thermoelectric element You may comprise with the cool storage member (illustration omitted) which stores the cold heat of this. Note that the heating unit 411 is not limited to an electric heater, and can be appropriately employed as long as it exhibits a heat dissipation action by power feeding. In addition, the cooling unit 412 is not limited to a thermoelectric element, and any cooling unit that exhibits a heat absorbing action by power feeding can be employed as appropriate. In addition, the heating unit 411 and the cooling unit 412 are separately provided with a circuit capable of switching the voltage direction, and are shared by a thermoelectric element such as a Peltier element capable of switching between a heat radiation action and a heat absorption action depending on the direction of the applied voltage. Also good.

  The temperature adjustment drive member 42 is connected between the temperature adjustment member 41 and each battery cell 200, and selectively switches the electrical connection relationship between the temperature adjustment member 41 and each battery cell 200, so that the temperature adjustment member 41 The power is supplied to

  The temperature control drive member 42 of the present embodiment is controlled according to the control signal of the monitoring control device 32, and the battery cell 200 and the temperature adjustment member determined to be discharged by the monitoring control device 32 according to the control signal. 41 is connected to one of the heating unit 411 and the cooling unit 412.

  The temperature detection unit 43 constitutes temperature detection means for detecting the temperature of the in-vehicle device 40. The temperature detection unit 43 of the present embodiment is composed of a plurality of temperature sensors (not shown) installed at a plurality of locations in the in-vehicle device 40.

  The vehicle control device 8 is a higher-level control device of the monitoring control device 32, and based on the output from the monitoring control device 32, connects the power supply system 1 and the inverter 6 via the motor-side relays 500 and 510, The power supply system 1 and the charger 7 are connected via the charging side relays 520 and 530. In addition, you may perform control of each relay 500-530 in the monitoring control apparatus 32. FIG.

  Specifically, when the motor generator MG travels, the vehicle control device 8 connects the power supply system 1 and the inverter 6 via the motor-side relays 500 and 510, and the electricity stored in the battery pack 20 is stored. Motor generator MG is driven by the energy. At this time, when regenerative energy is obtained by the motor generator MG, the battery pack 20 is charged by the power generated by the motor generator MG.

  When a commercial power source is connected to the charger 7 when the vehicle is parked or stopped, the power source system 1 and the charger 7 are connected by the vehicle control device 8 via the charging side relays 520 and 530, and the battery The pack 20 is charged until the storage capacity of the pack 20 reaches a predetermined amount. The electric energy stored in the battery pack 20 by this charging is used for the next vehicle travel and for operating various devices inside and outside the vehicle.

  Next, a control process for equalizing the storage capacity (charge amount) of each battery cell 200 executed by the monitoring control device 32 of the power supply system 1 according to the present embodiment will be described based on the flowchart of FIG. 5 is executed periodically or in response to a control signal from the vehicle control device 8.

  As shown in FIG. 5, first, a control signal instructing each monitoring device 31 to detect the cell voltage of each battery cell 200 is output, and the voltage detection circuit 312 of each monitoring device 31 is used to output each battery cell 200. The detection result of the cell voltage is acquired (S10).

  Then, it is determined from the detection result of the cell voltage of each battery cell 200 acquired in step S10 whether or not the variation in the cell voltage of each battery cell 200 is equal to or greater than a predetermined threshold (S20). Note that the threshold value in the determination process of step S20 is determined in advance by experiments or the like so that when the battery pack 20 is charged, the available storage capacity of the entire battery pack 20 is maintained at a predetermined capacity or more.

  The determination process of step S20 determines whether or not it is necessary to equalize the storage capacity in each battery cell 200, and among the detection values corresponding to the cell voltage of each battery cell 200, the lowest detection value and the highest detection value. It is determined whether the difference from the value is greater than or equal to a threshold value. The determination as to whether or not the storage capacity in each battery cell 200 needs to be equalized is not limited to this. For example, the average value of the detection values corresponding to the cell voltage of each battery cell 200, the highest detection value, and the lowest detection value. You may make it determine whether the difference of a value is more than a threshold value.

  Subsequently, as a result of the determination process in step S20, when it is determined that the cell voltage variation of each battery cell 200 is lower than the threshold, the subsequent processing is skipped, and the cell voltage variation of each battery cell 200 is equal to or greater than the threshold. Is determined, the battery cell 200 to be discharged is determined from each battery cell 200 (S30).

  In the process of step S <b> 30, among the battery cells 200, the battery cell 200 that has a higher voltage value than the other battery cells 200 is determined as the battery cell 200 to be discharged. In step S30, not only one battery cell 200 but also a plurality of battery cells 200 may be determined as discharge targets. For example, as shown in FIG. 7, when the storage capacities of the three battery cells A to C are varied, the battery cells A and C having a higher storage capacity than the battery cell B are determined as discharge targets.

  In step S30, the required discharge amount of the battery cell 200 is calculated in accordance with the determination of the battery cell 200 to be discharged, and the discharge time required for discharging the required discharge amount is calculated.

  Subsequently, the temperature of a plurality of locations of the in-vehicle device 40 constituting the temperature adjustment object is acquired from the temperature detection unit 43, and a representative temperature (average temperature or temperature of a predetermined local part) in the in-vehicle device 40 is previously determined. It is determined whether or not the temperature is outside the appropriate temperature range set in consideration of the heat resistance of 40 (S40).

  As a result, when it is determined that the temperature of the in-vehicle device 40 is out of the proper temperature range, the temperature adjustment processing of the in-vehicle device 40 by the temperature adjustment member 41 is executed (S50). The specific contents of this temperature adjustment process will be described with reference to the flowchart of FIG.

  As shown in FIG. 6, in order to appropriately adjust the temperature of the in-vehicle device 40 that constitutes the temperature adjustment object, is the representative temperature of the in-vehicle device 40 that constitutes the temperature adjustment object lower than the appropriate temperature range? It is determined whether or not (S51).

  As a result, when it is determined that the representative temperature of the in-vehicle device 40 is lower than the appropriate temperature range, temperature control drive is performed so that power is supplied from the battery cell 200 to be discharged to the heating unit 411 of the temperature adjustment member 41. A control signal is output to the member 42 (S52). Specifically, an instruction signal for instructing electrical connection between the battery cell 200 to be discharged and the heating unit 411 of the temperature adjustment member 41 and a control signal indicating the discharge time are output to the temperature adjustment drive member 42.

  Thereby, the battery cell 200 used as discharge object is connected to the heating part 411 of the temperature adjustment member 41 until discharge time passes, and the electrical storage capacity of each battery cell 200 which comprises the battery pack 20 is equalized.

  For example, among the three battery cells A to C shown in FIG. 7, when the battery cell A and the battery cell C are determined to be discharged, the electrical energy of the battery cell A and the battery cell C is discharged, As shown in FIG. 8, the storage capacities of the battery cells A to C are equalized.

  At this time, the electric energy of the battery cell 200 to be discharged is supplied to the heating unit 411 of the temperature adjustment member 41, and the heating unit 411 generates heat, whereby the in-vehicle device 40 is heated. Thus, the electrical energy of the battery cell 200 to be discharged is used for temperature adjustment of the in-vehicle device 40.

  Further, when it is determined in step S51 that the representative temperature of the in-vehicle device 40 exceeds the appropriate temperature range, power is supplied from the battery cell 200 to be discharged to the cooling unit 412 of the temperature adjustment member 41. Then, a control signal is output to the temperature adjustment drive member 42 (S53). Specifically, an instruction signal for instructing electrical connection between the battery cell 200 to be discharged and the cooling unit 412 of the temperature adjustment member 41 and a control signal indicating the discharge time are output to the temperature adjustment drive member 42.

  Thereby, the battery cell 200 to be discharged is connected to the cooling unit 412 of the temperature adjustment member 41 until the discharge time elapses, and the storage capacity of each battery cell 200 constituting the battery pack 20 is equalized, The in-vehicle device 40 is cooled by the cooling unit 412.

  On the other hand, when the temperature of the in-vehicle device 40 is determined to be within the appropriate temperature range as a result of the determination process in step S40, the battery cell 200 determined to be discharged by the equalization circuit 311 is discharged to the monitoring device 31. An instruction signal to be instructed and a control signal indicating the discharge time are output (S60). Specifically, the monitoring control device 32 turns on the short-circuit switch of the equalization circuit connected to the battery cell 200 determined as the discharge target with respect to the switch switching circuit 313 of the corresponding monitoring device 31 determined as the discharge target. A control signal for instructing is output. As a result, the short-circuit switch 311b corresponding to the battery cell 200 to be discharged is turned on for the discharge time, and the storage capacity of each battery cell 200 constituting the battery pack 20 is equalized.

  In the present embodiment described above, when the battery cells 200 are equalized, the monitoring control device 32 causes the temperature control drive member 42 so that the battery cell 200 to be discharged and the temperature adjustment member 41 are electrically connected. It is set as the structure which controls.

  According to this, since the electric energy of the battery cell 200 to be discharged can be effectively used for temperature adjustment of the in-vehicle device 40 that constitutes the temperature adjustment object, wasted power at the time of equalization of the battery cells 200 Consumption can be suppressed.

  In particular, in the present embodiment, the temperature adjustment member 41 is configured by a heating unit 411 that exhibits a heat dissipation action by power feeding and a cooling unit 412 that exhibits a heat absorbing action by power feeding.

  According to this, when the temperature of the vehicle-mounted device 40 falls below the appropriate temperature range, the temperature control drive member 42 is controlled so that power is supplied from the battery cell 200 to be discharged to the heating unit 411 of the temperature adjustment member 41. Thus, the temperature of the in-vehicle device 40 can be appropriately increased by using the power at the time of equalization of the battery cells 200 to be discharged.

  Furthermore, when the temperature of the in-vehicle device 40 exceeds the appropriate temperature range, by controlling the temperature adjustment drive member 42 so that power is supplied from the battery cell 200 to be discharged to the cooling unit 412 of the temperature adjustment member 41, The temperature of the in-vehicle device 40 can be appropriately reduced by using the power at the time of equalization of the battery cells 200 to be discharged.

  Therefore, it is possible to appropriately adjust the temperature of the in-vehicle device 40 that constitutes the temperature adjustment object using the electric energy of the battery cell 200 to be discharged.

  Here, in this embodiment, although the example which comprises the temperature adjustment member 41 with the heating part 411 and the cooling part 412 was demonstrated, it is not limited to this.

  For example, when the in-vehicle device 40 has excellent resistance at high temperatures, the temperature adjustment member 41 may be configured by only the heating unit 411. In this case, when the temperature of the in-vehicle device 40 falls below the proper temperature range, the monitoring control device 32 is temperature-controlled so that power is supplied from the battery cell 200 to be discharged to the temperature adjustment member 41 (heating unit 411). When the control signal is output to the member 42 and the temperature of the in-vehicle device 40 is not below the appropriate temperature range, the equalizing circuit 311 may discharge the battery cell 200 to be discharged. Note that, regardless of the temperature of the in-vehicle device 40, the monitoring control device 32 outputs a control signal to the temperature adjustment drive member 42 so that power is supplied from the battery cell 200 to be discharged to the temperature adjustment member 41 (heating unit 411). You may make it do.

  In addition, when the in-vehicle device 40 has excellent resistance at low temperatures, the temperature adjustment member 41 may be configured by only the cooling unit 412. In this case, when the temperature of the in-vehicle device 40 exceeds the appropriate temperature range, the monitoring control device 32 is temperature-controlled so that power is supplied from the battery cell 200 to be discharged to the temperature adjustment member 41 (cooling unit 412). When the control signal is output to the member 42 and the temperature of the in-vehicle device 40 does not exceed the appropriate temperature range, the battery cell 200 to be discharged may be discharged by the equalization circuit 311. Regardless of the temperature of the in-vehicle device 40, the monitoring control device 32 outputs a control signal to the temperature adjustment drive member 42 so that power is supplied from the battery cell 200 to be discharged to the temperature adjustment member 41 (cooling unit 412). You may make it do.

  Moreover, although this embodiment demonstrated the example which discharges the battery cell 200 determined as the discharge object in the equalization circuit 311 when it determines with the temperature of the vehicle equipment 40 being in an appropriate temperature range, it is limited to this. Not.

  For example, even when the temperature of the in-vehicle device 40 is determined to be within the appropriate temperature range, the monitoring control device 32 causes the battery cell 200 to be discharged and the heating unit 411 or the cooling unit 412 of the temperature adjustment member 41 to be electrically connected. You may make it control the temperature control drive member 42 so that it may be connected to. In this case, the equalization circuit 311 and the temperature detection unit 43 can be omitted.

(Second Embodiment)
Next, a second embodiment will be described. In the present embodiment, an example will be described in which the temperature adjustment target is a part of the battery cell 200 (battery stack CS) constituting the battery pack 20. In the present embodiment, description of the same or equivalent parts as in the first embodiment will be omitted or simplified.

  First, the temperature-input / output characteristics of a typical battery pack 20 will be described with reference to FIGS. As shown in FIG. 9, when the battery output (discharge) of the battery pack 20 deviates from an appropriate temperature range (for example, 0 ° C. to 40 ° C.), the output performance tends to rapidly decrease. Similarly, as shown in FIG. 10, when the battery input (charging) of the battery pack 20 is out of the appropriate temperature range, the input performance tends to rapidly decrease.

  Therefore, in the present embodiment, the temperature adjustment object is each battery stack CS of the battery pack 20 and the temperature adjustment member 41 is in thermal contact with each battery stack CS, so that the temperature of each battery stack CS is increased. Is adjusted by the temperature adjustment member 41.

  Specifically, the temperature adjustment member 41 has a shape extending in the stacking direction of the battery stack CS as shown in FIG. 11 so that the temperature adjustment member 41 can adjust the temperature of the entire region in the stacking direction of the battery stack CS. The battery stack CS is arranged on the outer periphery so as to be in direct contact with the battery stack CS.

  Moreover, the temperature detection part 43 of this embodiment is comprised by the several temperature sensor 43a arrange | positioned in the multiple places of the lamination direction of the battery stack CS. Thereby, the temperature distribution in the stacking direction of the battery stack CS can be detected.

  Other configurations and operations are the same as those in the first embodiment. According to the configuration of the present embodiment, the electric energy of the battery cell 200 to be discharged can be effectively used for temperature adjustment of the battery stack CS that constitutes the battery pack 20.

  In particular, in this embodiment, since the temperature of the battery pack 20 whose input / output characteristics change due to a temperature change is adjusted, the battery output of the battery pack 20 and the battery input decrease due to the temperature change of the battery pack 20 are effective. Can be suppressed.

  In the present embodiment, since the temperature adjusting member 41 has a shape extending in the stacking direction of the battery stack CS, the temperature of the entire region in the stacking direction of the battery stack CS can be adjusted.

(Third embodiment)
Next, a third embodiment will be described. This embodiment demonstrates the example which changed the arrangement | positioning form of the temperature adjustment member 41 with respect to 2nd Embodiment. In the present embodiment, description of the same or equivalent parts as in the first and second embodiments will be omitted or simplified.

  The end of the battery stack CS in the stacking direction has a larger area exposed to the surrounding air than the central portion in the stacking direction, and thus tends to be easily affected by temperature changes around the battery stack CS.

  In addition, the battery stack CS may exchange heat with the external structure 203 via the stay 202 having heat conductivity, and the battery cell 200 closest to the stay 202 in the battery stack CS is affected by an external temperature change. It tends to be easy.

  For this reason, in the present embodiment, the temperature adjustment member 41 is arranged to be in thermal contact with the end portion in the stacking direction of the battery stack CS, and the temperature of the part that is easily affected by the surrounding temperature change in the battery stack CS is set to the temperature. The adjustment member 41 is used for adjustment.

  Specifically, as shown in FIGS. 12 and 13, the temperature adjustment member 41 is configured in a plate shape that extends over a cell surface extending in a direction orthogonal to the stacking direction of the battery stack CS. The temperature adjustment member 41 is disposed between the battery cell 200 and the stay 202 so as to be adjacent to the battery cell 200 at the end in the stacking direction of the battery stack CS.

  Other configurations and operations are the same as those in the above-described embodiments. According to the configuration of the present embodiment, similarly to the configuration of the second embodiment, the electrical energy of the battery cell 200 to be discharged can be effectively used for temperature adjustment of the battery stack CS that constitutes the battery pack 20. .

  In particular, in the present embodiment, the temperature adjusting member 41 is disposed at the end in the stacking direction that is easily affected by the surrounding temperature change in the battery stack CS, and the portion that is easily affected by the surrounding temperature change in each battery stack CS. The temperature is adjusted in a concentrated manner. According to this, the temperature of the battery stack CS can be appropriately adjusted using the electrical energy of the battery cell 200 to be discharged.

  Further, in the present embodiment, the temperature adjustment member 41 is disposed between the battery cell 200 and the stay 202 that are closest to the stay 202 in the battery stack CS, and a portion that is easily affected by the surrounding temperature change in each battery stack CS. The temperature is concentrated and adjusted. For this reason, the heat flow through the stay 202 between the battery stack CS and the external structure 203 can be blocked, and unnecessary heat exchange between the battery stack CS and the external structure 203 can be suppressed. . Thereby, the temperature of battery stack CS can be adjusted appropriately using the electrical energy of battery cell 200 to be discharged.

  In addition, as shown in FIG. 14, when the battery pack 20 is configured by connecting the battery stacks CS in a direction orthogonal to the stacking direction of the battery cells CS via the connecting member 21b, You may make it arrange | position the temperature adjustment member 41 in the edge part of the lamination direction. This also makes it possible to appropriately adjust the temperature of the battery stack CS by using the electrical energy of the battery cell 200 to be discharged.

  In the present embodiment, an example in which the stays 202 are provided at both ends in the stacking direction of the battery stack CS has been described, but the attachment position of the stay 202 is not limited to both ends in the stacking direction. For example, the stay 202 may be provided on a side surface along the stacking direction of the battery stack CS.

  In this case, the temperature adjustment member 41 may be disposed at the end of the battery stack CS in the stacking direction and at least one of the battery cell 200 and the stay 202 closest to the stay 202 in the battery stack CS.

(Fourth embodiment)
Next, a fourth embodiment will be described. This embodiment demonstrates the example which changed the arrangement | positioning form of the temperature adjustment member 41 with respect to 2nd, 3rd embodiment. In the present embodiment, description of the same or equivalent parts as in the first to third embodiments will be omitted or simplified.

  In the present embodiment, the temperature adjustment member 41 is not brought into direct contact with the battery stack CS, but indirectly through the stay 202 constituting the stack connecting member.

  Specifically, as shown in FIGS. 15 and 16, the temperature adjustment member 41 of the present embodiment is disposed adjacent to the stay 202 that contacts the battery stack CS so as to be in thermal contact with the battery stack CS. Has been.

  Other configurations and operations are the same as those in the above-described embodiments. According to the configuration of the present embodiment, as in the configurations of the second and third embodiments, the electrical energy of the battery cell 200 to be discharged is effectively utilized for temperature adjustment of the battery stack CS that constitutes the battery pack 20. be able to.

  In particular, in the present embodiment, the temperature adjustment member 41 is disposed adjacent to the stay 202 in the battery stack CS, and the battery cell 200 closest to the stay 202 is concentrated and temperature adjusted via the stay 202. According to this, the heat flow through the stay 202 between the battery stack CS and the external structure 203 is blocked, and unnecessary heat exchange between the battery stack CS and the external structure 203 is suppressed. Can do. Thereby, the temperature of battery stack CS can be adjusted appropriately using the electrical energy of battery cell 200 to be discharged.

  In addition, as shown in FIG. 14, when the battery pack 20 is configured by connecting the battery stacks CS in a direction orthogonal to the stacking direction of the battery cells CS via the connecting member 21b, the battery stacks CS are connected to each other. The temperature adjusting member 41 may be disposed adjacent to the connecting member 21b that connects the two. This also makes it possible to appropriately adjust the temperature of the battery stack CS by using the electrical energy of the battery cell 200 to be discharged.

(Fifth embodiment)
Next, a fifth embodiment will be described. In the present embodiment, an example in which the temperature adjustment target is the entire battery pack 20 will be described. In the present embodiment, description of the same or equivalent parts as in the first to fourth embodiments will be omitted or simplified.

  In the present embodiment, the temperature control object is the battery pack 20. That is, in the present embodiment, the temperature adjustment member 41 is not in thermal contact with the battery stack CS, but is in thermal contact with the battery pack 20.

  Specifically, as shown in FIG. 17, the temperature adjustment member 41 of this embodiment is adjacent to a bracket 21a that connects the battery pack 20 to an external structure so as to be in thermal contact with the battery stack CS. Are arranged. Note that the temperature adjustment member 41 is indirectly in contact with the battery pack 20 via the bracket 21a.

  Other configurations and operations are the same as those in the above-described embodiments. According to the configuration of the present embodiment, the electric energy of the battery cell 200 to be discharged can be effectively used for temperature adjustment of the entire battery pack 20.

  In particular, as in this embodiment, if the temperature is adjusted by concentrating the bracket 21a itself that is easily affected by the external temperature in the battery pack 20, the bracket 21a between the battery pack 20 and the external structure is adjusted. Therefore, unnecessary heat exchange between the battery pack 20 and the external structure can be suppressed. Thereby, the temperature of the battery pack 20 can be appropriately adjusted using the electrical energy of the battery cell 200 to be discharged.

  In the present embodiment, the temperature adjustment member 41 is described as being disposed adjacent to the bracket 21a that connects the battery pack 20 to an external structure. However, the present invention is not limited to this example. It is good also as the arrangement structure which contacts the site | part nearest to the bracket 21a in the battery pack 20. FIG. According to this, it is possible to adjust the temperature by concentrating the parts that are easily affected by the external temperature in the battery pack 20, and to adjust the temperature of the battery pack 20 appropriately.

  Of course, the temperature adjusting member 41 may be arranged so as to contact both the bracket 21a that connects the battery pack 20 to an external structure and the portion of the battery pack 20 that is closest to the bracket 21a.

(Sixth embodiment)
Next, a sixth embodiment will be described. This embodiment demonstrates the example which changed the arrangement | positioning form of the temperature adjustment member 41 with respect to 5th Embodiment. In the present embodiment, description of the same or equivalent parts as in the first to fifth embodiments will be omitted or simplified.

  As shown in FIG. 18, an electrical component 22 whose temperature changes is provided around the battery pack 20 of the present embodiment. 18 corresponds to the drawing showing the battery pack 20 of FIG.

  The electrical component 22 of the present embodiment is configured by a junction box that houses the relays 500 to 530. In addition, as long as the electrical component 22 is a device that changes in temperature, the electrical component 22 includes a device that constitutes the battery monitoring unit 3, at least a part of each of the relays 500 to 530, the charger 7, and the like in addition to the junction box. Also good.

  As described above, when the electrical component 22 is arranged around the battery pack 20, the peripheral portion of the electrical component 22 in the battery pack 20 is easily affected by the temperature change of the electrical component 22. Even if the electrical component 22 is not in direct contact, the battery pack 20 is affected by the temperature change of the electrical component 22 as long as the electrical component 22 is disposed around the battery pack 20. .

  For this reason, in this embodiment, it is set as the arrangement | positioning form which makes the temperature adjustment member 41 contact the site | part affected by the temperature change of the electrical component 22 in the battery pack 20 directly. Specifically, the temperature adjustment member 41 of the present embodiment is disposed so as to contact a portion closest to the electrical component 22 in the battery pack 20.

  Other configurations and operations are the same as those in the above-described embodiments. According to the configuration of the present embodiment, the electric energy of the battery cell 200 to be discharged can be effectively used for temperature adjustment of the battery pack 20.

  In particular, in the present embodiment, the temperature adjustment member 41 is disposed in a part that is susceptible to the temperature change of the electrical component 22 in the battery pack 20, and the part that is susceptible to the temperature change of the electrical part 22 in the battery pack 20. The temperature is concentrated and adjusted. Thereby, the temperature of battery stack CS can be adjusted appropriately using the electrical energy of battery cell 200 to be discharged.

  The temperature adjustment member 41 may be disposed between the battery pack 20 and the electrical component 22 as shown in FIG. In this case, the temperature adjustment member 41 can adjust the temperature of the battery pack 20 and can block the heat flow between the battery pack 20 and the electrical component 22.

(Seventh embodiment)
Next, a seventh embodiment will be described. This embodiment demonstrates the example which changed the arrangement | positioning form of the temperature adjustment member 41 with respect to 6th Embodiment. In the present embodiment, description of the same or equivalent parts as in the first to sixth embodiments will be omitted or simplified.

  In the present embodiment, as shown in FIG. 20, an arrangement configuration in which the temperature adjustment member 41 is brought into contact with the electrical component 22 provided in the battery pack 20, that is, the temperature adjustment member 41 is connected to the battery pack 20 via the electrical component 22. It is set as the arrangement form which contacts indirectly.

  Other configurations and operations are the same as those in the above-described embodiments. In the present embodiment, the temperature adjustment member 41 is arranged to contact the battery pack 20 indirectly via the electrical component 22. According to this, the temperature of the battery pack 20 can be appropriately adjusted via the electrical component 22 using the electrical energy of the battery cell 200 to be discharged.

(Eighth embodiment)
Next, an eighth embodiment will be described. This embodiment demonstrates the example which changed the content of the control process which the monitoring control apparatus 32 performs with respect to the 2nd-7th embodiment which uses the battery stack CS or the battery pack 20 as a temperature control object. In the present embodiment, description of the same or equivalent parts as in the first to seventh embodiments will be omitted or simplified.

  A control process for equalizing the storage capacity (charge amount) of each battery cell 200 executed by the monitoring control device 32 of the power supply system 1 according to the present embodiment will be described based on the flowchart of FIG. The control process in FIG. 21 corresponds to the control process shown in FIG.

  In the control process of the present embodiment, as shown in FIG. 21, when the temperature of the temperature object (battery stack CS or battery pack 20) is determined to be within the appropriate temperature range in the determination process of step S40, It is determined whether or not the temperature variation of the temperature object is equal to or greater than a predetermined allowable value (S70). Note that the allowable value in the determination process of step S70 is determined in advance by experiments or the like so that the input / output characteristics of the local parts in the battery pack 20 are not biased.

  The determination process of step S70 determines whether or not the difference between the lowest detected temperature and the highest detected temperature among the detected temperatures of the temperature sensors 43a constituting the temperature detecting unit 43 is equal to or greater than an allowable value. The determination regarding the presence or absence of temperature variation of the temperature object is not limited to this, and for example, the difference between the average value of the detected temperatures of each temperature sensor 43a and the highest detected temperature or the lowest detected temperature is equal to or greater than the allowable value. It may be determined whether or not.

  As a result of the determination process in step S70, when it is determined that the temperature variation of the temperature object is smaller than the allowable value, the process proceeds to step S60, and each battery cell 200 configuring the battery pack 20 in the equalization circuit 311. Equalize the storage capacity.

  On the other hand, if it is determined as a result of the determination process in step S70 that the temperature variation of the temperature object is equal to or greater than the allowable value, a temperature distribution suppression process for suppressing the temperature distribution of the temperature object is executed (S80). The specific contents of this temperature distribution suppression process will be described with reference to the flowchart of FIG.

  As shown in FIG. 22, first, it is determined whether or not the temperature adjustment object is heated (S81). Specifically, in the determination process in step S81, when the outside air temperature is equal to or lower than a preset reference temperature (for example, 25 ° C.), it is determined that the temperature adjustment target is to be heated and becomes higher than the reference temperature. Then, it is determined that the temperature control object is cooled. Whether or not to heat the temperature control object may be determined according to a season such as summer or winter, or a time zone such as daytime or nighttime, regardless of the outside air temperature.

  As a result of the determination process in step S81, when it is determined to heat the temperature adjustment object, the temperature adjustment drive member 42 is controlled so that power is supplied from the battery cell 200 to be discharged to the heating unit 411 of the temperature adjustment member 41. A signal is output (S82). That is, when it is determined to heat the temperature adjustment object, the battery cell 20 determined as the discharge object is connected to the temperature adjustment member 41 and the temperature adjustment drive member so that the temperature adjustment member 41 exhibits a heating function. 42 is controlled.

  Thereby, the battery cell 200 to be discharged is connected to the heating unit 411 of the temperature adjustment member 41 until the discharge time elapses, and the storage capacity of each battery cell 200 is equalized, and the heating unit 411 The adjustment target is heated and the temperature distribution of the temperature adjustment target is suppressed.

  On the other hand, if it is determined as a result of the determination process in step S81 that the temperature adjustment target is cooled, the temperature adjustment drive member 42 is supplied so that power is supplied from the battery cell 200 to be discharged to the cooling unit 412 of the temperature adjustment member 41. A control signal is output to (S83). That is, when it is determined that the temperature adjustment target is cooled, the battery cell 20 determined as the discharge target is connected to the temperature adjustment member 41 and the temperature adjustment drive member so that the temperature adjustment member 41 exhibits a cooling function. 42 is controlled.

  Thereby, the battery cell 200 to be discharged is connected to the cooling unit 412 of the temperature adjustment member 41 until the discharge time elapses, and the storage capacity of each battery cell 200 is equalized, and the cooling unit 412 The temperature adjustment target is cooled and the temperature distribution of the temperature adjustment target is suppressed.

  Other configurations and operations are the same as those of the above-described embodiments. According to the configuration of the present embodiment, even when the temperature of the battery stack CS or the battery pack 20 constituting the temperature adjustment object is within the appropriate temperature range, if the temperature adjustment object has a temperature variation, The temperature adjustment of the temperature adjustment object by the temperature adjustment member 41 is performed using the electric power at the time of equalization of the battery cells 200. According to this, the electric power at the time of equalization of each battery cell 200 can be utilized effectively for suppression of the temperature variation of the temperature control object.

  In the present embodiment, power is supplied from the battery cell 200 to be discharged to either the heating unit 411 or the cooling unit 412 of the temperature adjustment member 41 based on the determination result of whether or not to heat the temperature adjustment object. Although the example which determines this was demonstrated, it is not limited to this.

  For example, in the temperature distribution suppression process, without determining whether or not to heat the temperature adjustment object, simply supplying power from the battery cell 200 to be discharged to the heating unit 411 of the temperature adjustment member 41 or Alternatively, power may be supplied from the battery cell 200 to the cooling unit 412 of the temperature adjustment member 41.

(Ninth embodiment)
Next, a ninth embodiment will be described. This embodiment demonstrates the example which changed the content of the temperature distribution suppression process which the monitoring control apparatus 32 performs with respect to 8th Embodiment. In the present embodiment, description of the same or equivalent parts as in the first to eighth embodiments will be omitted or simplified.

  A temperature distribution suppression process executed by the monitoring control device 32 of the power supply system 1 according to the present embodiment will be described based on the flowchart of FIG. Note that the control process of FIG. 23 corresponds to the control process shown in FIG.

  In the temperature distribution suppression process of the present embodiment, as shown in FIG. 23, the temperature at the location closest to the temperature adjustment member 41 among the plurality of temperature detection locations in the temperature adjustment object is the highest compared to other locations. It is determined whether or not the temperature is reached (S84). Specifically, among the detected temperatures of the temperature sensors 43a constituting the temperature detecting unit 43, the detected temperature of the temperature sensor 43a closest to the temperature adjusting member 41 is compared with the detected temperatures of the other temperature sensors 43a. To determine whether the temperature is the highest.

  As a result of this determination processing, when it is determined that the temperature at the location closest to the temperature adjustment member 41 is the highest temperature compared to other locations, the temperature adjustment is performed by adjusting the temperature of the temperature adjustment object by the temperature adjustment member 41. Since there is a possibility that the temperature distribution of the object may be expanded, the process proceeds to step S60, and the equalization circuit 311 equalizes the storage capacity of each battery cell 200 constituting the battery pack 20.

  On the other hand, when it is determined that the temperature at the location closest to the temperature adjustment member 41 is not the highest temperature compared to other locations, that is, the temperature other than the location closest to the temperature adjustment member 41 is the highest temperature. The process proceeds to step S82. That is, the battery cell 20 determined as a discharge target is connected to the temperature adjustment member 41 and the temperature adjustment drive member 42 is controlled so that the temperature adjustment member 41 exhibits a heating function.

  Other configurations and operations are the same as those of the above-described embodiments. According to the configuration of the present embodiment, even if the temperature of the battery stack CS or the battery pack 20 constituting the temperature adjustment object is within the appropriate temperature range, temperature variation occurs in the temperature adjustment object, and the temperature adjustment member When the temperature other than the position closest to 41 is the highest temperature, the heating unit 411 of the temperature adjustment member 41 is configured to adjust the temperature of the temperature adjustment object. According to this, the electric power at the time of equalization of each battery cell 200 can be utilized, and suppression of the temperature dispersion | variation of a temperature control target object can be aimed at.

  In the present embodiment, in the determination process in step S84, when it is determined that the temperature at the location closest to the temperature adjustment member 41 is the highest temperature compared to other locations, an example of shifting to step S60. Although explained, it is not restricted to this, For example, you may make it transfer to step S83. Also by this, it is possible to suppress the temperature variation of the temperature adjustment target object by using the power at the time of equalization of the battery cells 200.

  Moreover, although this embodiment demonstrated the example which transfers to step S82, when temperature other than the location nearest to the temperature adjustment member 41 is the highest temperature among several temperature detection locations in a temperature control object. However, the present invention is not limited to this. For example, you may make it transfer to step S82, when the average temperature of the several temperature detection location in a temperature control object becomes below predetermined temperature.

(10th Embodiment)
Next, a tenth embodiment will be described. This embodiment demonstrates the example which changed the content of the temperature distribution suppression process which the monitoring control apparatus 32 performs with respect to 9th Embodiment. In the present embodiment, description of the same or equivalent parts as in the first to ninth embodiments will be omitted or simplified.

  The temperature distribution suppression process executed by the monitoring control device 32 of the power supply system 1 according to the present embodiment will be described based on the flowchart of FIG. Note that the control processing of FIG. 24 corresponds to the control processing shown in FIGS.

  In the temperature distribution suppression process of this embodiment, as shown in FIG. 24, the temperature at the location closest to the temperature adjustment member 41 among the plurality of temperature detection locations in the temperature adjustment object is the lowest compared to other locations. It is determined whether or not the temperature is reached (S85). Specifically, among the detected temperatures of the temperature sensors 43a constituting the temperature detecting unit 43, the detected temperature of the temperature sensor 43a closest to the temperature adjusting member 41 is compared with the detected temperatures of the other temperature sensors 43a. To determine whether the temperature is the lowest.

  As a result of this determination processing, when it is determined that the temperature at the location closest to the temperature adjustment member 41 is the lowest temperature compared to other locations, the temperature adjustment is performed by adjusting the temperature of the temperature adjustment object by the temperature adjustment member 41. Since there is a possibility that the temperature distribution of the object may be expanded, the process proceeds to step S60, and the equalization circuit 311 equalizes the storage capacity of each battery cell 200 constituting the battery pack 20.

  On the other hand, when it is determined that the temperature at the location closest to the temperature adjustment member 41 is not the lowest temperature compared to other locations, that is, the temperature other than the location closest to the temperature adjustment member 41 is the lowest temperature. The process proceeds to step S83. That is, the battery cell 20 determined to be discharged is connected to the temperature adjustment member 41, and the temperature adjustment drive member 42 is controlled so that the temperature adjustment member 41 exhibits a cooling function.

  Other configurations and operations are the same as those of the above-described embodiments. According to the configuration of the present embodiment, even if the temperature of the battery stack CS or the battery pack 20 that constitutes the temperature adjustment object is within the appropriate temperature range, temperature variation occurs in the temperature adjustment object, and the temperature adjustment member When the temperature other than the location closest to 41 is the lowest, the cooling unit 412 of the temperature adjustment member 41 adjusts the temperature of the temperature adjustment object. According to this, the electric power at the time of equalization of each battery cell 200 can be utilized, and suppression of the temperature dispersion | variation of a temperature regulation object can be aimed at.

  In the present embodiment, in the determination process of step S85, when it is determined that the temperature at the location closest to the temperature adjustment member 41 is the lowest temperature compared to other locations, an example of shifting to step S60. Although explained, it is not restricted to this, For example, you may make it transfer to step S82. Also by this, it is possible to suppress the temperature variation of the temperature adjustment target object by using the power at the time of equalization of the battery cells 200.

  Moreover, although this embodiment demonstrated the example which transfers to step S83, when temperature other than the location nearest to the temperature adjustment member 41 is the lowest temperature among several temperature detection locations in a temperature control object. However, the present invention is not limited to this. For example, you may make it transfer to step S83, when the average temperature of the several temperature detection location in a temperature control target object exceeds predetermined temperature.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment, In the range described in the claim, it can change suitably. For example, various modifications are possible as follows.

  (1) In each of the above-described embodiments, the example in which the battery pack 20 constituting the assembled battery is a series connection body in which a plurality of battery cells 200 are electrically connected in series has been described. However, the present invention is not limited to this. The battery pack 20 is configured, for example, by electrically connecting in parallel a predetermined number of battery cells 200, or by electrically connecting a predetermined number of battery cells 200 in parallel. May be electrically connected in series.

  (2) In each of the above-described embodiments, the example in which the power supply system of the present invention is applied to a plug-in hybrid vehicle has been described. However, the present invention is not limited to this. The power supply system of the present invention may be applied to, for example, a hybrid vehicle, an electric vehicle, a railway vehicle power supply system, a stationary power supply system used in homes, factories, and the like.

  (3) In each of the above-described embodiments, the elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Needless to say. Further, in each of the above-described embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is clearly indicated that it is particularly essential and clearly specified in principle. It is not limited to the specific number except in a limited case. Furthermore, in each of the above-described embodiments, when referring to the shape, positional relationship, etc. of the component, etc., unless specifically stated or limited in principle to a specific shape, positional relationship, etc. The positional relationship is not limited.

  (4) The above-described embodiments are not irrelevant to each other, and can be appropriately combined unless the combination is clearly impossible.

1 Power supply system 20 Battery pack (assembled battery)
200 battery cell 32b equalization determination means (monitoring control device)
32c Discharge target determining means (monitoring control device)
32d Temperature control means (monitoring control device)
40 On-vehicle equipment 41 Temperature adjustment member 42 Temperature control drive member CS Battery stack

Claims (15)

An assembled battery (20) composed of a plurality of battery cells (200);
Voltage detection means (312) for detecting the voltage of each of the plurality of battery cells;
Equalization determination means (32b) for determining whether or not it is necessary to equalize the storage capacity of the plurality of battery cells based on the voltage detected by the voltage detection means;
A discharge target determining means (32c) for determining at least one battery cell to be discharged from the plurality of battery cells when the equalization determining means determines that the storage capacity needs to be equalized;
A temperature adjustment member (41) that adjusts the temperature of the temperature control object (20, 40, CS) using at least one battery cell as a power source among the plurality of battery cells;
A temperature control drive member (42) that selectively switches an electrical connection relationship between the plurality of battery cells and the temperature adjustment member;
Temperature control means (32d) for controlling the temperature control drive member,
When the equalization determination unit determines that the storage capacity needs to be equalized, the temperature control control unit connects the battery cell determined as the discharge target by the discharge target determination unit to the temperature adjustment member. The power supply system is characterized in that the temperature control drive member is controlled. Temperature detecting means (43) for detecting the temperature of the temperature control object;
The temperature adjustment control unit determines that the equalization determination unit needs to equalize the storage capacity, and when the temperature detected by the temperature detection unit is out of a predetermined appropriate temperature range, The power supply system according to claim 1, wherein the temperature control driving member is controlled so that the battery cell determined as a discharge target by the discharge target determination unit is connected to the temperature adjustment member. The temperature adjusting member includes a heating unit (411) that radiates and heats the temperature control object by feeding power,
The temperature adjustment control means determines that the equalization determination means needs to equalize the storage capacity, and when the temperature detected by the temperature detection means falls below a predetermined appropriate temperature range, The power supply system according to claim 2, wherein the temperature control driving member is controlled so that power is supplied to the heating unit from the battery cell determined as a discharge target by a discharge target determination unit. The temperature adjustment member is configured to include a cooling unit (412) that absorbs heat from the temperature adjustment object by power feeding and cools the object.
The temperature control means, when the equalization determination means determines that the storage capacity needs to be equalized, and when the temperature detected by the temperature detection means exceeds a predetermined appropriate temperature range, 4. The power supply system according to claim 2, wherein the temperature control driving member is controlled so that power is supplied to the cooling unit from the battery cell determined as a discharge target by a discharge target determination unit. The temperature control object is composed of at least some of the plurality of battery cells,
The power supply system according to any one of claims 2 to 4, wherein the temperature adjustment member is disposed so as to be in thermal contact with the battery cell constituting the temperature adjustment object.   6. The power supply system according to claim 5, wherein the assembled battery is a battery pack having at least one battery stack (CS) configured by stacking the plurality of battery cells in a predetermined number unit. The temperature control object is the battery stack,
The temperature adjusting member is disposed adjacent to an end portion in the stacking direction of the battery stack constituting the temperature control object, and is in contact with an end portion in the stacking direction of the battery stack. Item 7. The power supply system according to Item 6. The temperature control object is the battery stack,
The battery stack is connected to an external structure through a stack connecting member (202) having heat conductivity,
The power supply system according to claim 6, wherein the temperature adjustment member is in contact with a portion of the battery stack that is closest to the stack connection member and at least one of the stack connection members. The temperature control object is the battery pack,
The battery pack is connected to an external structure through a pack connecting member (21a) having heat conductivity,
The power supply system according to claim 6, wherein the temperature adjusting member is in thermal contact with at least one of the portion of the battery pack that is closest to the pack connecting member and the pack connecting member. The temperature control object is the battery pack,
Around the battery pack, an electrical component (22) whose temperature changes is arranged,
The power supply system according to claim 6, wherein the temperature adjusting member is in thermal contact with a portion of the battery pack that is affected by a temperature change of the electrical component. The temperature control object is the battery pack,
Around the battery pack, an electrical component (22) whose temperature changes is arranged,
The power supply system according to claim 6, wherein the temperature adjustment member is in thermal contact with the battery pack via the electrical component. The temperature adjusting member has a heating function of radiating heat to the temperature adjustment object and heating the temperature adjustment object,
The temperature detection means is configured to be capable of detecting temperatures at a plurality of locations in the temperature control object,
The temperature control means is a case where the equalization determination means determines that the storage capacity needs to be equalized, and the temperature detected by the temperature detection means falls within the appropriate temperature range, and the temperature control means When the temperature variation at a plurality of locations in the adjustment target is equal to or greater than a predetermined allowable value, the battery cell determined as a discharge target by the discharge target determination means is connected to the temperature adjustment member, and the temperature The power supply system according to any one of claims 5 to 11, wherein the temperature control drive member is controlled so that the adjustment member exhibits the heating function.   The temperature control means is a case where the equalization determination means determines that the storage capacity needs to be equalized, and the temperature detected by the temperature detection means falls within the appropriate temperature range, and the temperature control means The temperature variation at a plurality of locations in the adjustment object is equal to or greater than a predetermined allowable value, and at least other than the location closest to the temperature adjustment member among the temperatures at the plurality of locations where the temperature is detected by the temperature detecting means. When the temperature reaches the lowest temperature, the battery cell determined as a discharge target by the discharge target determination means is connected to the temperature adjustment member, and the temperature adjustment member exhibits the heating function. The power supply system according to claim 12, wherein the temperature control drive member is controlled. The temperature adjusting member has a cooling function of absorbing heat from the temperature adjustment object and cooling the temperature adjustment object,
The temperature detection means is configured to be capable of detecting temperatures at a plurality of locations in the temperature control object,
The temperature control means is a case where the equalization determination means determines that the storage capacity needs to be equalized, and the temperature detected by the temperature detection means falls within the appropriate temperature range, and the temperature control means When the temperature variation at a plurality of locations in the adjustment target is equal to or greater than a predetermined allowable value, the battery cell determined as a discharge target by the discharge target determination means is connected to the temperature adjustment member, and the temperature The power supply system according to any one of claims 5 to 11, wherein the temperature control drive member is controlled so that the adjustment member exhibits the cooling function.   The temperature control means is a case where the equalization determination means determines that the storage capacity needs to be equalized, and the temperature detected by the temperature detection means falls within the appropriate temperature range, and the temperature control means The temperature variation at a plurality of locations in the adjustment object is equal to or greater than a predetermined allowable value, and at least other than the location closest to the temperature adjustment member among the temperatures at the plurality of locations where the temperature is detected by the temperature detecting means. When the temperature reaches the highest temperature, the battery cell determined as a discharge target by the discharge target determination unit is connected to the temperature adjustment member, and the temperature adjustment member exhibits the cooling function. The power supply system according to claim 14, wherein the temperature control drive member is controlled.

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