JP2003274565A - Power storage system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quicken the temperature rise speed of a secondary battery by increasing the current flowing to the secondary battery, when heating the secondary battery by the internal heat generated by the repeated charging and discharging of the secondary battery. <P>SOLUTION: This power storage is equipped with a secondary battery 21 and a storage 2 having a capacitor 22 connected in parallel with each other, a generator-motor 3 to charge this storage 2, a vehicle drive motor 4 which discharges the power from the storage 2, and a controller 7 which controls the charging and discharging in the storage 2 with the generator-motor 3 and the vehicle drive motor 4, and an inductor 23 is connected in series with the capacitor 22 of the storage 2. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power storage device suitable for use in, for example, a hybrid vehicle equipped with a secondary battery.

[0002]

2. Description of the Related Art A secondary battery involving a chemical reaction as described above has a characteristic that the dischargeable output decreases in a low temperature environment. For example, when such a secondary battery is mounted in a hybrid vehicle. Is a vehicle design that emphasizes use at low temperatures,
In other words, instead of designing a vehicle that incorporates many secondary batteries to compensate for the drop in dischargeable output, design a vehicle with secondary battery performance at room temperature even at the expense of the drop in dischargeable output in low temperature environments. By doing so, an increase in cost and a decrease in vehicle power performance and fuel efficiency performance are avoided.

The graph of FIG. 8 shows the fuel consumption rate (vertical axis) of the vehicle for the secondary battery dischargeable output (horizontal axis) of the parallel hybrid vehicle, and line A runs while discharging the secondary battery. In this case, the fuel consumption rate is shown, and the line B shows the fuel consumption rate when traveling while charging the secondary battery.

As can be seen from the graph in FIG. 8, when traveling while charging the secondary battery, the engine is driven to operate the power generation means to charge the secondary battery, so that the secondary battery is discharged while traveling. The fuel consumption rate is reduced by the amount of energy required to charge the secondary battery, as compared with the case of performing.

The larger the dischargeable output of the secondary battery, the longer the running with the motor as the driving source can be continued, and the low efficiency operation state at the time of low engine rotation such as when the vehicle starts is avoided. The fuel consumption rate improves as much as possible. On the other hand, if the dischargeable output of the secondary battery becomes zero, the fuel consumption rate will be the same as that of a vehicle equipped with a normal engine, so if the dischargeable output of the secondary battery can output the designed value, the original parallel hybrid vehicle Will be able to demonstrate the fuel efficiency performance of.

That is, in order to improve the fuel efficiency of the vehicle, the temperature of the secondary battery is raised as quickly as possible in consideration of the decrease in the secondary battery dischargeable output at low temperatures. Will be required.

As a heating method for raising the temperature of the secondary battery, heating by an external heater or internal heat generated by repeated charging / discharging of the secondary battery can be considered. The latter heating method is a power generating means. And the discharge means are satisfied, it is considered to be more feasible than the external heating method using the heater unit, which requires the space for mounting the vehicle, which is accompanied by an increase in weight, and particularly, the power generation means and the discharge means. It is suitable for parallel hybrid vehicles and series hybrid vehicles equipped with a drive motor and auxiliary equipment. As such a heating method, for example, an inductor and a capacitor are connected in series between an AC power source and a secondary battery, and the secondary battery is repeatedly charged and discharged by alternating current having a resonance frequency of the inductor and the capacitor to raise the voltage. There is a structure that heats up (Japanese Patent Laid-Open No. 11-329516).

[0008]

Conventionally, although the value of the current flowing through the secondary battery increases when the charging / discharging is repeated at a low frequency, the impedance on the capacitor side is increased when the charging / discharging is repeated at a certain frequency or higher. The current value flowing through the secondary battery becomes smaller (see line D in FIG. 6), and only a part of the electric power applied to the electricity storage portion is used for heating the secondary battery. There is a problem in that the temperature rising rate of the battery cannot be sufficiently obtained, and the fuel efficiency cannot be improved, and it has been a conventional problem to solve this problem.

[0009]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to the above-mentioned conventional problems. When the secondary battery is heated by internal heat generated by repeated charging and discharging of the secondary battery, An object of the present invention is to provide a power storage device in which the value of flowing current can be increased to increase the temperature rising rate of a secondary battery.

[0010]

A power storage device according to claim 1 of the present invention comprises a power storage unit having a secondary battery and a capacitor connected in parallel with each other, a power generation unit for charging the power storage unit, and a power storage unit. The power storage unit includes a discharging unit that discharges electric power, and a charging / discharging control unit that controls charging / discharging of the power storage unit by the power generation unit and the discharging unit. The power storage unit and the discharging unit are alternately operated under the control of the charging / discharging control unit. In order to solve the above-mentioned conventional problems, the configuration is such that an inductor is connected in series to the capacitor of the power storage unit in order to heat the secondary battery of the power storage unit at the stage of repeated charging and discharging. Is used as a means.

In the power storage device according to claim 2 of the present invention, the charge / discharge control unit detects the temperature and the remaining capacity of the secondary battery of the power storage unit and calculates the dischargeable output of the power storage unit. And a control means for repeatedly performing charging / discharging of the power storage unit based on the dischargeable output of the power storage unit calculated by the dischargeable output calculation unit.

According to a third aspect of the present invention, there is provided a power storage device including a power storage unit having a secondary battery and a capacitor connected in parallel with each other, a power generation unit for charging the power storage unit, and a discharging unit for discharging power from the power storage unit. And a charging / discharging control unit for controlling charging / discharging of the power storage unit by the power generation unit and the discharging unit, and the charging / discharging unit repeatedly operates by alternately operating the power generation unit and the discharging unit under the control of the charging / discharging control unit. In order to heat the secondary battery of the power storage unit in stages, a resistor is connected in series to the capacitor of the power storage unit via a switch, and the configuration of this power storage device is a means for solving the above-mentioned conventional problems. I am trying.

In the power storage device according to a fourth aspect of the present invention, the charge / discharge control unit detects the temperature and the remaining capacity of the secondary battery of the power storage unit and calculates the dischargeable output of the power storage unit. And a control unit that causes a current to flow through a resistor based on the dischargeable output of the power storage unit calculated by the dischargeable output calculation unit, and the charge and discharge according to claim 5 of the present invention. The control unit is configured to include a control unit that causes a current to flow through a resistance of the power storage unit according to a frequency at which the power storage unit is repeatedly charged and discharged, and the power storage device according to claim 6 of the present invention is the capacitor of the power storage unit. Is an electric double layer capacitor.

According to a seventh aspect of the present invention, the discharging means is a vehicle driving motor of a series hybrid vehicle or an auxiliary machine of the vehicle, and the electricity storing device according to the eighth aspect of the invention is a discharging means. Is a vehicle driving motor of a parallel hybrid vehicle having a power source other than the vehicle driving motor or an auxiliary machine of the vehicle.

In the power storage device according to the present invention, the power storage unit in which a secondary battery and a capacitor are connected in parallel is constituted by a single secondary battery in order to secure output characteristics at low temperature when used as a power source for a parallel hybrid vehicle. It is more compact and less expensive than the power storage unit. The reason is that the output characteristics change largely due to the temperature change of the secondary battery, while the output characteristics hardly change due to the temperature change of the capacitor. In other words, the reason why a large number of secondary batteries must be mounted to satisfy low-temperature performance is supplemented by a capacitor with good low-temperature performance.At this time, the output performance at low temperature required for the power storage unit is It is an output that does not hinder driving.

In an electricity storage unit in which a secondary battery and a capacitor are connected in parallel, an inductor is connected in series with the capacitor to increase the impedance during repeated charging and discharging at high frequencies.
As indicated by, the current value flowing through the secondary battery increases, and the temperature rise of the secondary battery due to internal heat generation becomes faster. In this graph of FIG. 6, the horizontal axis represents the charging and discharging frequencies, and the vertical axis represents the current value flowing in the secondary battery. When charging and discharging are repeated without connecting the inductor to the capacitor, that is, When charging and discharging are repeated by the heating method, the value of the current flowing through the secondary battery is as shown by the line D, as described above.

Here, FIG. 7 shows the relation between the capacitance of the capacitor and the optimum inductance of the inductor for raising the temperature of the secondary battery. The graph of FIG. 7 shows the capacitance of the capacitor on the horizontal axis and the inductance of the inductor on the vertical axis, and the inductance of the inductor changes depending on the capacitance of the capacitor. The method of deriving this relationship can be obtained by calculating the impedance of the AC circuit including the capacitance of the capacitor and the inductance of the inductor. That is, in order to effectively raise the temperature of the secondary battery, it is preferable to set the value of the inductor to the value in the upper right region of the line E in FIG. 7, but the larger the inductance of the inductor, the larger the weight and volume. Therefore, it is preferable to design the inductance on the line E.

[0018]

Since the power storage device according to the first aspect of the present invention has the above-mentioned structure, the power generation means and the discharge means are alternately operated by the control of the charge / discharge control section to repeat the charge / discharge of the power storage section. If this is done, as the impedance on the capacitor and inductor side increases, the value of the current flowing through the secondary battery in parallel with these increases. Since the amount of heat generated by the secondary battery is proportional to the square of the current value flowing through the secondary battery, the rate of temperature rise of the secondary battery can be improved.

In the electric storage device according to claim 2 of the present invention,
The dischargeable output calculation means of the charge / discharge control unit determines the dischargeable output of the secondary battery from the temperature and the remaining capacity of the secondary battery. For example, when the dischargeable output of the secondary battery is equal to or less than a predetermined value, Since the control means determines that it is necessary to raise the temperature of the secondary battery and executes repeated control of charging / discharging, charging / discharging of the power storage unit is performed at an appropriate timing.

In the electricity storage device according to claim 3 of the present invention,
With the above-mentioned configuration, when the power generation means and the discharge means are alternately operated under the control of the charge / discharge control section to repeatedly charge / discharge the power storage section, the DC resistance on the capacitor side and the resistance side increases. As a result, the current value flowing through the secondary battery located in parallel with these increases. Since the heat generation amount of the secondary battery is proportional to the square of the current value flowing in the secondary battery, the temperature rising rate of the secondary battery can be improved.

In the electric storage device according to claim 4 of the present invention,
The dischargeable output calculation means of the charge / discharge control unit determines the dischargeable output of the secondary battery from the temperature and the remaining capacity of the secondary battery. For example, when the dischargeable output of the secondary battery is equal to or less than a predetermined value, Since the control means determines that the temperature of the secondary battery needs to be raised and the resistance switch is turned on to repeatedly execute the charging / discharging control, the charging / discharging of the power storage unit is performed at an appropriate timing. Become.

According to a fifth aspect of the present invention, in the power storage device,
With the above configuration, when the frequency of repeating charging and discharging is higher than a predetermined value, the control means turns on the resistor to execute the repeated control of charging / discharging. Will be done in.

In the electricity storage device according to claim 6 of the present invention,
The electric double layer capacitor has a storage capacity 10 times larger than that of other electrolytic capacitors and has excellent output characteristics. Therefore, it is advantageous in terms of weight and space to obtain the same output as the electrolytic capacitor. It is suitable for automobiles.

In the electricity storage device according to claims 7 and 8 of the present invention, it is not necessary to separately prepare a generator and a discharger for raising the temperature of the secondary battery, and the weight reduction and the system The simplification will be achieved.

[0025]

Since the power storage device according to the first aspect of the present invention has the above-mentioned configuration, by repeatedly charging and discharging the power storage unit under the control of the charge / discharge control unit,
It is possible to increase the value of the current flowing through the secondary battery, and as a result, it is possible to realize the improvement of the temperature rising rate of the secondary battery, which is a very excellent effect.

In the electric storage device according to claim 2 of the present invention,
With the above-described configuration, it is possible to charge and discharge the power storage unit at an appropriate timing, and it is possible to prevent wasteful consumption of energy, which is a very excellent effect.

In the electricity storage device according to claim 3 of the present invention,
Because of the above-described configuration, it is possible to realize a very excellent effect that the cost can be reduced and the temperature rising rate of the secondary battery can be drastically increased similarly to the power storage device according to claim 1. .

In the electricity storage device according to claim 4 of the present invention,
With the above-described configuration, similarly to the power storage device according to the second aspect, it is possible to prevent the wasteful consumption of energy, which is a very excellent effect.

In the electricity storage device according to claim 5 of the present invention,
When the frequency of repeating charging and discharging is higher than a predetermined value, it is possible to perform repetitive control of charging and discharging of the power storage unit, and it is possible to obtain the output from the power storage unit at all times, which is a very excellent effect. .

In the electricity storage device according to claim 6 of the present invention,
Due to the above-mentioned configuration, it is advantageous in terms of weight and space for mounting on a vehicle, and an extremely excellent effect that fuel consumption performance can be improved is brought about.

Since the power storage device according to the seventh and eighth aspects of the present invention has the above-mentioned configuration, it is possible to achieve a very excellent effect that the weight can be reduced and the system can be simplified.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

[Embodiment 1] FIGS. 1 to 3 show an embodiment of a power storage device according to the present invention. In this embodiment,
The case where the power storage device according to the present invention is adopted in a series hybrid vehicle is shown. In FIG. 1, a thick solid line indicates a mechanical force transmission path, a thick broken line indicates a power line, and a thin solid line indicates a control line. The power train of this vehicle includes a drive motor 4, a differential mechanism 18, and drive wheels. The drive motor 4 serves as a propulsion source for the vehicle.

Power storage device 1 of this series hybrid vehicle
Is a power storage unit 2, a power generation motor (power generation means) 3 mainly used for starting and power generation of the engine 17, and the drive motor (discharge means) mainly used for propulsion and braking of the vehicle.
4, inverters 5 and 6 respectively driving the generator motor 3 and the drive motor 4, a controller (charging / discharging control unit) 7 that controls charging / discharging of the power storage unit 2, a DC link 8 and a DC / DC to the power storage unit 2. A vehicle auxiliary machine (discharging means) 10 connected via a converter 9 is provided, and the generator motor 3 and the drive motor 4 are both AC machines such as a three-phase synchronous motor or a three-phase induction motor.

As shown in FIG. 2, the power storage unit 2 is a power source in which a secondary battery 21 and an electric double layer capacitor 22 are connected in parallel, and an inductor 23 is connected in series with the electric double layer capacitor 22. Yes, that is, the secondary battery 21
And is connected in parallel to supply electric power to the auxiliary device 10 of the vehicle.

The inverters 5 and 6 have a common DC link 8
Is connected to the power storage unit 2 via the AC power supply unit 2, converts the DC discharge power of the power storage unit 2 into AC power and supplies the AC power to the power generation motor 3 and the drive motor 4, and at the same time, supplies the AC power generation of the power generation motor 3 and the drive motor 4. The power storage unit 2 is charged by converting into DC power. These inverters 5 and 6 are
Since they are connected to each other via the DC link 8, the electric power generated by the motor during the regenerative operation can be directly supplied to the motor during the power running operation without the power storage unit 2.

The controller 7 controls the charging / discharging of the power storage unit 2 and controls the rotation speed, output and torque of the engine 17, and also controls the rotation speed and torque of the generator motor 3 and the drive motor 4. This controller 7 has
Temperature sensor 11 that detects temperature TB of the secondary battery in power storage unit 2 and temperature TC of electric double layer capacitor 22, voltage sensor 12 that detects terminal voltage VB of power storage unit 2, and current value IB of power storage unit 2 The signal from the current sensor 13 for detecting the state of charge is input and the remaining capacity SOC of the power storage unit 2 is calculated.

Further, controller 7 has temperature TB of secondary battery 21 of power storage unit 2 and map data of dischargeable output and chargeable input of power storage unit 2 with respect to remaining capacity SOC of power storage unit 2, From the temperature TB and the remaining capacity SOC of the secondary battery 21 measured by the sensor 11, the dischargeable output Pout, max and the chargeable input Pin,
You can calculate max.

The controller 7 controls the engine 17 when the vehicle is traveling at a constant speed in which the load fluctuation of the vehicle is small.
To generate power by operating the generator motor 3 with the power of
That is, power storage unit 2 can be charged, while the vehicle can be driven by the power of drive motor 4 and auxiliary device 10 can be driven, that is, power storage unit 2 can be discharged. That is, the power storage unit 2 can be repeatedly charged and discharged at any frequency without impairing the running performance of the vehicle.

The charging / discharging repetition frequency for the power storage unit 2 can be mechanically reduced. However, if the charging / discharging repetition frequency is reduced, the generator motor 3 which is the power generating means of the vehicle or the drive which is the discharging means. Since the motor 4 and the auxiliary machine 10 are used for a long time, they cannot be controlled when the vehicle is running. Therefore, the charging / discharging repetition frequency is 1 Hz or higher.

Next, the electricity storage device 1 according to the above embodiment
The action of will be described based on the flowchart of FIG.

As shown in FIG. 3, when the key of the vehicle is turned on in step S1, it is determined in step S2 whether or not the key is off. If it is determined to be key off (Yes), the process proceeds to step S3 and the system is stopped. If it is determined that the key is on (No), the process proceeds to step S4, and the controller 7 calculates the remaining capacity of the power storage unit 2, measures the temperature of the power storage unit 2, discharges the power storage unit 2 from the remaining capacity of the power storage unit 2 and the temperature of the power storage unit 2. The possible output Pout, max is calculated.

Next, in step S5, it is determined whether or not the dischargeable output Pout, max of the power storage unit 2 is equal to or more than the output required for hybrid traveling, and if the dischargeable output of the power storage unit 2 is less than that value, the series It is judged that the fuel economy performance cannot be fully exerted as a hybrid vehicle
6, the temperature rise control of power storage unit 2 is started in step S6, and the process returns to step S2. On the other hand, when the dischargeable output of power storage unit 2 is equal to or higher than the output value required for hybrid traveling, it is determined that fuel efficiency performance can be sufficiently exhibited as a series hybrid vehicle, and the process proceeds to step S7 to control the temperature rise of power storage unit 2. Is stopped and the process returns to step S2.

In this electricity storage device 1, as described above, when charging / discharging of electricity storage unit 2 is repeatedly performed by the temperature rise control of controller 7, the impedance of electric double layer capacitor 22 and inductor 23 side of electricity storage unit 2 is changed. As the size of the secondary battery 21 increases, the value of the current flowing through the secondary battery 21 in the parallel position increases, and at this time, the amount of heat generated by the secondary battery 21 is proportional to the square of the value of the current flowing through the secondary battery 21. Therefore, the rate of temperature rise of the secondary battery 21 can be improved.

Further, in the above-described power storage device 1, the controller 7 calculates the dischargeable output Pout, max and the chargeable input Pin, max of the power storage unit 2 from the temperature TB and the remaining capacity SOC of the secondary battery 21. In addition, it is determined whether or not the dischargeable output Pout, max of the power storage unit 2 is equal to or more than the output required for hybrid traveling, so that the dischargeable output of the secondary battery 21 is less than or equal to a predetermined value. In this case, the temperature increase control is executed by the controller 7, and therefore the power storage unit 2 is charged and discharged at an appropriate timing.

Further, in the above-described power storage device 1, since the capacitor of the power storage unit 2 is the electric double layer capacitor 22, the storage capacity is 10 times or more larger than that of the electrolytic capacitor and the output characteristics are excellent. It is advantageous in terms of space, and is optimal for automobiles.

Furthermore, in this embodiment, the above-described power storage device 1 is mounted on a series hybrid vehicle, and the vehicle drive motor 4 of this series hybrid vehicle and the vehicle auxiliary machine 10 are adopted as discharging means. Secondary battery 21
Since it is not necessary to separately prepare a generator and a discharger for raising the temperature, the weight can be reduced and the system can be simplified accordingly.

[Embodiment 2] FIG. 4 shows another embodiment of the power storage device according to the present invention. In this embodiment, the power storage device according to the present invention is used in a parallel hybrid vehicle. In FIG. 4, a thick solid line indicates a mechanical force transmission path, a thick broken line indicates a power line, and a thin solid line indicates a control line.

The power train of this vehicle comprises a generator motor 3, an engine 17, a clutch 16, a drive motor 4, a continuously variable transmission 15, a differential device 18, and drive wheels 19, and the output shaft of the generator motor 3 is used. The output shaft of the engine 17 and the input shaft of the clutch 16 are connected to each other, and the output shaft of the clutch 16, the output shaft of the drive motor 4 and the input shaft of the continuously variable transmission 15 are connected to each other. When the clutch 16 is engaged, the engine 17 and the drive motor 4 are propulsion sources for the vehicle, while when the clutch 16 is disengaged, only the drive motor 4 is a propulsion source for the vehicle. Then, the driving force of each of the engine 17 and the drive motor 4 or the driving force of the drive motor 4 alone is transmitted to the drive wheels 19 via the continuously variable transmission 15 and the differential device 18 in any case.

In this case, the clutch 16 is a powder clutch and adjusts the transmission torque. A dry single-plate clutch or a wet multi-plate clutch can be used as the clutch. Further, the continuously variable transmission 15 is a continuously variable transmission such as a belt type or toroidal type, and adjusts the gear ratio steplessly.

Power storage device 1 of this parallel hybrid vehicle
A is a power storage unit 2 having the same configuration as the power storage unit 2 of the power storage device 1 in the previous embodiment, the power generation motor (power generation means) 3 mainly used for starting and generating power of the engine 17, and mainly for propulsion and braking of the vehicle. The drive motor (discharge means) 4 to be used, the inverters 5 and 6 having the same configuration as the inverters 5 and 6 of the power storage device 1 in the previous embodiment, and the controller (charge / discharge control unit) that controls the charge / discharge of the power storage unit 2. ) 7
And a vehicle auxiliary device (discharging means) 10 connected to the power storage unit 2 via the DC link 8 and the DC / DC converter 9. The generator motor 3 and the drive motor 4 are both three-phase synchronous motors or It is an AC machine such as a three-phase induction motor. When the clutch 16 is engaged, the generator motor 3 can be used for propulsion and braking of the vehicle, and the drive motor 4 can be used for starting the engine 17 and generating electricity.

The controller 7 controls the charging / discharging of the power storage unit 2, the rotation speed, output and torque of the engine 17, the transmission torque of the clutch 16, and the like.
The rotation speed and torque of the generator motor 3 and the drive motor 4 are controlled, and the gear ratio of the continuously variable transmission 15 is controlled. The controller 7 includes a temperature sensor 11 that detects the temperature TB of the secondary battery in the power storage unit 2 and a temperature TC of the electric double layer capacitor 22, a voltage sensor 12 that detects the terminal voltage VB of the power storage unit 2, and a power storage unit. A signal from the current sensor 13 that detects the current value IB of the unit 2 is input, and the remaining capacity SOC of the power storage unit 2 is calculated.

Further, this controller 7 is the same as the controller 7 of the power storage device 1 according to the above-described embodiment in the power storage unit 2.
Temperature TB of the secondary battery 21 and the remaining capacity S of the power storage unit 2 of
It has map data of the dischargeable output and the chargeable input of the power storage unit 2 with respect to OC, and the dischargeable output Pout of the power storage unit 2 from the temperature TB and the remaining capacity SOC of the secondary battery 21 measured by the temperature sensor 11. , max and chargeable input Pin, max can be calculated.

The controller 7 drives the vehicle by the motive power of the engine 17 and operates the generator motor 3 to generate power when the vehicle runs at a constant speed in which the load fluctuation of the vehicle is small, that is, the power storage unit. 2 can be charged, while the vehicle is driven by the power of the engine 17, the power of the generator motor 1, and the power of the drive motor 4 and the auxiliary device 10, that is, the power storage unit 2 can be discharged. It has become. That is, the power storage unit 2 can be repeatedly charged and discharged at any frequency without impairing the running performance of the vehicle.

In the above-described power storage device 1A, the temperature rise control for power storage unit 2 is performed in the same manner as in the previous embodiment, that is, based on the flowchart of FIG. Is performed at an appropriate timing, and the temperature rising rate of the secondary battery 21 is improved.

In this embodiment, the power storage device 1A described above is used.
Mounted on a parallel hybrid vehicle, the vehicle drive motor 4 of the parallel hybrid vehicle and the vehicle accessory 10
Since the discharge means is adopted as the discharge means, the weight can be reduced and the system can be simplified as in the previous embodiment.

[Embodiment 3] FIG. 5 shows still another embodiment of the electricity storage device according to the present invention. The electricity storage device according to this embodiment is different from the electricity storage device 1 of the previous embodiment. In the power storage unit 2A, the resistor 2 is connected in series with the capacitor 22.
4 and the switch 25 are connected, and other configurations are the same as those of the power storage device 1 according to the previous embodiment.

In this case, the switch 25 can be on / off controlled by the controller 7, and normally,
The switch 25 is turned on so that no current flows through the resistor 24.

Then, in the temperature rise control for the electricity storage unit 2 of the electricity storage device 1 according to the previous embodiment, that is, in the flowchart shown in FIG. 3, at the stage of entering the secondary battery temperature rise control routine of step S6, the charging is performed. When the discharge repetition frequency is lower than the predetermined value, the switch 25 is kept on so that no current flows through the resistor 24.
On the other hand, when the charging / discharging repetition frequency is higher than the predetermined value, the switch 25 is turned off so that the current flowing through the capacitor 22 is controlled to flow through the resistor 24.

This control prevents a decrease in the output from the power storage unit 2 due to the provision of the resistor 24 when the switch 25 is always turned off, and avoids that the power performance of the vehicle cannot be obtained. To do so.

In the power storage device described above, the resistor 24 and the switch 25 are connected in series with the capacitor 22 in the power storage unit 2A.
Since the configuration is connected, the temperature rising rate of the secondary battery 21 can be significantly increased, similarly to the power storage device 1 according to the previous embodiment, while achieving cost reduction.

[Brief description of drawings]

FIG. 1 is a system block diagram showing an embodiment of a power storage device according to the present invention.

FIG. 2 is a circuit explanatory diagram of a power storage unit of the power storage device shown in FIG.

FIG. 3 is a flowchart illustrating power storage unit temperature raising control of the power storage device shown in FIG. 1.

FIG. 4 is a system block diagram showing another embodiment of the power storage device according to the present invention.

FIG. 5 is a circuit explanatory diagram of a power storage unit showing still another embodiment of the power storage device according to the present invention.

FIG. 6 is a graph showing the relationship between charge / discharge repetition frequency and the value of current flowing in a secondary battery.

FIG. 7 is a graph showing the relationship between the capacitance of a capacitor and the inductance of an inductor.

FIG. 8 is a graph showing the relationship between the dischargeable output of a secondary battery and the fuel consumption rate of a parallel hybrid vehicle.

[Explanation of symbols]

1,1A power storage device 2,2A power storage unit 3 Power generation motor (power generation means) 4 Drive motor (discharging means) 7 Controller (charge / discharge control unit) 10 Vehicle accessories (discharging means) 21 secondary battery 22 Capacitor 23 Inductor 24 resistance 25 switch

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B60L 11/12 ZHV B60L 11/12 ZHV 11/14 11/14 H01M 10/44 H01M 10/44 P 10 / 50 10/50 F term (reference) 5G003 AA07 BA01 CB01 DA07 FA06 GC05 5H030 AA01 AS08 BB01 BB08 BB10 BB21 FF22 FF41 5H031 CC09 KK03 5H115 PA12 PC06 PG04 PI14 PI16 PI24 PI29 PI30 PO01 PO02 PO06 PU27 PU22 PU17 PU22 PU22 PU29 PV02 PV10 QE20 QI04 QN03 SE04 SE05 SE06 SE09 TI02 TI05 TI06 TI10

Claims (8)

[Claims] 1. A power storage unit having a secondary battery and a capacitor connected in parallel to each other, a power generation unit for charging the power storage unit, a discharging unit for discharging electric power from the power storage unit, and a power storage unit including the power generation unit and the discharging unit. A charging / discharging control unit that controls charging / discharging is provided, and the secondary battery of the power storage unit generates heat when the charging / discharging control unit controls the power generation unit and the discharging unit alternately to repeatedly charge / discharge the power storage unit. In order to achieve this, an inductor is connected in series to a capacitor of the electricity storage unit, which is an electricity storage device. 2. A charging / discharging control unit detects a temperature and a remaining capacity of a secondary battery of a power storage unit and calculates a dischargeable output of the power storage unit, and a dischargeable output calculation unit. The power storage device according to claim 1, further comprising a control unit configured to repeatedly charge and discharge the power storage unit based on the dischargeable output of the stored power storage unit. 3. A power storage unit having a secondary battery and a capacitor connected in parallel with each other, a power generation unit for charging the power storage unit, a discharging unit for discharging electric power from the power storage unit, and a power storage unit including the power generation unit and the discharging unit. A charging / discharging control unit that controls charging / discharging is provided, and the secondary battery of the power storage unit generates heat when the charging / discharging control unit controls the power generation unit and the discharging unit alternately to repeatedly charge / discharge the power storage unit. In order to achieve this, a resistor is connected in series via a switch to the capacitor of the electricity storage unit, which is an electricity storage device. 4. A charging / discharging control unit detects a temperature and a remaining capacity of a secondary battery of a power storage unit and calculates a dischargeable output of the power storage unit, and a dischargeable output calculation unit. The power storage device according to claim 3, further comprising a control unit that causes a current to flow through the resistor based on the dischargeable output of the power storage unit. 5. The power storage device according to claim 3, wherein the charge / discharge control unit includes a control unit that causes a current to flow in the resistance of the power storage unit according to a frequency at which the power storage unit is repeatedly charged and discharged. 6. The power storage device according to claim 1, wherein the capacitor of the power storage unit is an electric double layer capacitor. 7. The power storage device according to claim 1, wherein the discharging means is a vehicle drive motor of a series hybrid vehicle or an auxiliary machine of the vehicle. 8. The power storage device according to claim 1, wherein the discharging means is a vehicle driving motor of a parallel hybrid vehicle having a power source other than the vehicle driving motor or an auxiliary machine of the vehicle.