JP2014018017A - Battery system controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery system controller capable of protecting a high performance storage battery when failures occur in a battery system having the high performance storage battery.SOLUTION: A battery controller is applied to a battery system having an alternator 10, electric loads 41, 42, 43 electrically connected in parallel to the alternator 10, a lead accumulator 20 electrically connected in parallel to the alternator 10, a lithium battery 30 electrically connected in parallel to the alternator 10 for charging generating power of the alternator 10 and discharge power of the lead accumulator 20, and an SMR switch 60 for switching electrical conduction or cut-off between the alternator 10 and electric loads 42, 43, and the lead accumulator 20 and the lithium battery 30. When the SMR switch 60 is switched to electrical conduction and the lithium battery 30 is not charged, the SMR 60 is switched to cut-off.

Description

  The present invention relates to a control device for a battery system including a generator, an electric load, and a high-performance storage battery.

  In general, a vehicle using an engine as a driving source is equipped with a lead storage battery that supplies electric power to various loads such as a starter motor. Lead acid batteries are inexpensive but have low durability against frequent charging and discharging. Therefore, the lead storage battery mounted on a vehicle having an idle stop function or a vehicle that performs regenerative power generation is concerned about early deterioration.

  Therefore, as disclosed in Patent Document 1, a high-performance storage battery having high output, high energy density, and high durability against charge / discharge, and a lead storage battery connected in parallel with the high-performance storage battery, Proper battery systems have been proposed.

JP 2012-80706 A

  When an abnormality occurs in the battery system including the high-performance storage battery as described above, there is a concern that the high-performance storage battery may be in an overdischarged state. High-performance storage batteries are more expensive than lead storage batteries and may not be restored once they are overdischarged. Therefore, when an abnormality occurs in a battery system including a high-performance storage battery, it is desirable to protect only the high-performance storage battery depending on the situation.

  An object of the present invention is to provide a battery system control device capable of protecting a high-performance storage battery when an abnormality occurs in a battery system including a high-output and high-density high-performance storage battery. And

  In order to solve the above-mentioned problem, the invention according to claim 1 is a battery system control device, wherein the generator is driven by the output shaft of the engine to generate electric power, and is electrically connected in parallel with the generator. An electrical load, a lead storage battery that is electrically connected in parallel with the generator and capable of charging the power generated by the generator, and the power generated by the generator that is electrically connected in parallel with the generator and the lead storage battery; and A high-output and high-energy density high-performance storage battery capable of charging the discharge power of the lead-acid battery, and the generator, the electrical load, and the lead-acid battery and the high-performance storage battery are electrically connected, and the generator An open / close switch that switches between energization and interruption of the electric load and the lead storage battery and the high performance storage battery, and the terminal voltage of the high performance storage battery is controlled to be lower than the terminal voltage of the lead storage battery Is applied to a battery system, and switches the opening and closing switch to the current, and when the high-performance battery is not charged, switch the off switch in said cutoff.

  The invention described in claim 1 is applied to a battery system in which a generator, an electric load, a lead storage battery, and a high-performance storage battery are electrically connected in parallel via an on-off switch. In such a battery system, when the terminal voltage of the high-performance storage battery is controlled to be lower than the terminal voltage of the lead storage battery, at least the generator is usually used when the generator, the electrical load and the lead storage battery and the high-performance storage battery are energized. One of the generated power or the discharged power of the lead storage battery is charged to the high performance storage battery. On the other hand, the state in which the high-performance storage battery is not charged despite the energization of the generator, the electric load, and the lead storage battery and the high-performance storage battery is abnormal. When such an abnormality occurs, the high-performance storage battery may continue to supply power to the electric load without being charged, and may be in an overdischarged state.

  However, according to the first aspect of the present invention, when the high-performance storage battery is not charged, the open / close switch is switched to shut off the generator, the electrical load, the lead storage battery, and the high-performance storage battery. Therefore, when an abnormality occurs in the battery system, the high-performance storage battery can be protected.

  Further, the invention according to claim 5 is a battery system control device, a starter motor that starts the engine in response to a start operation by a mechanical key, a lead storage battery that is electrically connected in parallel with the starter motor, The starter motor and the lead storage battery are electrically connected in parallel and have a high output and high energy density, and the starter motor, the lead storage battery and the high performance storage battery are electrically connected, and the starter Applied to a battery system comprising a motor, an open / close switch for switching between energization and shutoff of the lead storage battery and the high performance storage battery, the open / close switch is switched to the energization, and a start operation by the mechanical key is performed. In the case of failure, the open / close switch is switched to the cutoff.

  The invention according to claim 5 is applied to a battery system in which a starter motor, a lead storage battery, and a high-performance storage battery are electrically connected via an open / close switch. In such a battery system, a start operation by a mechanical key is normally performed when the starter motor, the lead storage battery, and the high performance storage battery are not energized, and a large amount of power is supplied from the lead storage battery to the starter motor to drive the starter motor. .

  When the starter motor, lead acid battery, and high-performance storage battery are energized, if the driver accidentally starts the mechanical key, the high-performance storage battery may supply a large amount of power to the starter motor and become overdischarged. . Therefore, when a start operation with a mechanical key is performed during energization of the starter motor and the lead storage battery and the high performance storage battery, the starter motor, the lead storage battery and the high performance storage battery are shut off to protect the high performance storage battery. be able to.

The figure which shows schematic structure of the battery system which concerns on 1st Embodiment. The figure which shows schematic structure of the battery system which concerns on 2nd Embodiment.

  Hereinafter, each embodiment which implement | achieved the battery system control apparatus is described, referring drawings. A vehicle on which the battery system according to each embodiment is mounted has an idle stop function that automatically stops and restarts the engine when the engine is used as a travel drive source and predetermined automatic stop and automatic restart conditions are satisfied. . In the following embodiments, parts that are the same or equivalent to each other are denoted by the same reference numerals in the drawings, and the description of the same reference numerals is used.

(First embodiment)
FIG. 1 shows a battery system according to the first embodiment. The battery system according to this embodiment includes an alternator 10 (generator), a lead storage battery 20, a lithium storage battery 30 (high performance storage battery), a starter motor 41, electrical loads 42 and 43, and a circuit that opens and closes a current. Various switches for energizing or shutting off are provided. The various switches are a MOS switch 50, an SMR switch 60 (open / close switch), and a relay switch 70. The alternator 10, the lead storage battery 20, the lithium storage battery 30, the starter motor 41, and the electrical loads 42 and 43 are electrically connected in parallel to each other through the wiring 11.

  The alternator 10 is driven by the rotational energy of the crankshaft to generate power. Moreover, in this embodiment, the deceleration regeneration which makes the alternator 10 generate electric power with the regeneration energy of a vehicle is performed. This deceleration regeneration is performed when conditions such as that the vehicle is in a decelerating state and that fuel injection to the engine is cut off are satisfied. The electric power generated by the alternator 10 is supplied to the electric loads 42 and 43 and also supplied to the lead storage battery 20 and the lithium storage battery 30.

  The lead storage battery 20 is a well-known general-purpose storage battery. On the other hand, compared with the lead storage battery 20, the lithium storage battery 30 is a high performance storage battery that has high output and high energy density and high resistance to frequent charge and discharge. Both the lead storage battery 20 and the lithium storage battery 30 are configured by connecting a plurality of battery cells in series, but the lead storage battery 20 is configured to have a larger storage capacity than the lithium storage battery 30.

  The lead storage battery 20 includes a current sensor 21 that measures a current flowing out or inflow from the lead storage battery 20. Further, the lithium storage battery 30 includes a current sensor 32 that measures a current flowing out or inflow from the lithium storage battery 30. The detection values detected by the current sensor 21 and the current sensor 32 are transmitted to the ECU 80.

  The ECU 80 is a battery system control device in the present embodiment, and is configured as a well-known microcomputer including a CPU and a memory (ROM, RAM). The ECU 80 calculates the SOC (State of charge) of the lead storage battery 20 and the lithium storage battery 30 based on the acquired detection value, and determines the lead storage battery 20 and the lithium storage battery 30. The battery system is controlled so that the SOC is within an appropriate range. The appropriate range of the SOC is a range in which the storage battery is not overdischarged and overcharged. For example, the proper range of the lead storage battery 20 is 88% to 92%, and the proper range of the lithium storage battery 30 is 35% to 80%. .

  The voltage characteristics (open circuit voltage and SOC) of the lithium storage battery 30 are controlled so that the terminal voltage of the lithium storage battery 30 can be controlled to be lower than the terminal voltage of the lead storage battery 20 within the appropriate ranges of the lead storage battery 20 and the lithium storage battery 30. Relationship) is set. Such voltage characteristics of the lithium storage battery 30 can be realized by selecting a combination of the positive electrode active material, the negative electrode active material, and the electrolytic solution of the lithium storage battery 30. For example, the positive electrode active material is made of a lithium metal composite oxide such as LiCoO2, LiMn204, LiO2, and LiFePO4, the negative electrode active material is made of an alloy containing carbon, graphite, lithium titanate, Si, or Su, and the electrolyte is an organic electrolyte. Select from.

  The starter motor 41 is connected to the lead storage battery 20 via the relay switch 45. The relay switch 45 is a normally open electromagnetic relay, and is provided between the lead storage battery 20 and the starter motor 41. When the driver performs a start operation using the mechanical key 75 or an automatic restart command is issued from the idle stop control device, the relay switch 45 is turned on (conducted) in response to the input of the excitation current. Thereby, the starter motor 41 and the lead storage battery 20 are connected. The starter motor 41 is driven by receiving electric power from the lead storage battery 20 and applies initial rotation to the crankshaft of the engine.

  The electric load 43 is a constant voltage required electric load that is required to be stable so that the voltage of the supplied power is substantially constant or at least fluctuates within a predetermined range. Specific examples of the electric load 43 include a navigation device and an audio device. For example, when the voltage of the supplied power is not constant but fluctuates greatly, or fluctuates greatly beyond a predetermined range, the navigation device or the like is activated when the voltage instantaneously drops below the minimum operating voltage. Trouble to reset occurs. Therefore, the electric power supplied to the electric load 43 is required to be stable at a constant value where the voltage does not drop below the minimum operating voltage.

  The electric load 42 is a general electric load other than the electric load 43 and the starter motor 41. Specific examples of the electrical load 42 include wipers such as a headlight and a front windshield, a blower fan for an air conditioner, and a defroster heater for a rear windshield.

  The MOS switch 50 is a semiconductor switch composed of two MOSFETs, and is provided between the alternator 10, the starter motor 41, the electric load 42 and the lead storage battery 20, and the electric load 43 and the SMR switch 60. Therefore, the MOS switch 50 functions as a switch for switching energization (ON) and cutoff (OFF) of the alternator 10, the starter motor 41, the electric load 42, and the lead storage battery 20, and the electric load 43 and the lithium storage battery 30. Switching of the MOS switch 50 between an on operation (conduction operation) and an off operation (cut-off operation) is performed by the ECU 80.

  The two MOSFETs are connected in series so that the parasitic diodes are opposite to each other. Therefore, when the two MOSFETs are turned off, the current can be completely blocked from flowing through the respective parasitic diodes. Therefore, if the two MOSFETs are turned off, it is possible to avoid discharging from the lithium storage battery 30 to the lead storage battery 20 and charging from the lead storage battery 20 to the lithium storage battery 30.

  Similar to the MOS switch 50, the SMR switch 60 is a semiconductor switch composed of two MOSFETs, and is provided between the MOS switch 50 and the electric load 43 and the lithium storage battery 30. The SMR switch 60 is electrically connected in series with the lithium storage battery 30, and the series body of the SMR switch 60 and the lithium storage battery 30 is electrically connected in parallel with the alternator 10. That is, the alternator 10, the electric loads 42 and 43, the lead storage battery 20, the series body of the relay switch 45 and the starter motor 41, and the series body of the SMR switch 60 and the lithium storage battery 30 are electrically connected in parallel to each other. .

  The SMR switch 60 functions as a switch for switching energization (on) and interruption (off) between the alternator 10 and the electrical loads 42 and 43 and the lithium storage battery 30 in a state where the MOS switch 50 is turned on. That is, the SMR switch 60 functions as an emergency open / close switch that disconnects the lithium storage battery 30 from the battery system when an abnormality occurs in the battery system.

  The ECU 80 switches the SMR switch 60 between ON (conduction) and OFF (shut off). The SMR switch 60 is normally kept in an on state by receiving an on signal from the ECU 80 at normal times. When an abnormality occurs, the output of the on signal from the ECU 80 is stopped, and the SMR switch 60 is switched off. The lithium storage battery 30 is protected by switching the SMR switch 60 to OFF.

  The relay switch 70 is provided in a bypass path 71 that connects both sides of the MOS switch 50. The relay switch 70 is a normally closed electromagnetic relay. The relay switch 70 is an emergency energizing means used when an abnormality (failure) occurs in the MOS switch 50 or the ECU 80, and is turned off by receiving an excitation current input from the ECU 80 in a normal state (non-failure). It is in a state. For example, when an abnormality occurs in the ECU 80 and an ON signal cannot be output to the MOS switch 50 and an excitation current cannot be output to the relay switch 70, the relay switch 70 is turned ON. Thereby, since the bypass path 71 is conducted, the electric load 43 can receive power from at least one of the alternator 10 and the lead storage battery 20 via the bypass path 71.

  The lithium storage battery 30, the MOS switch 50, the SMR switch 60, the relay switch 70, and the ECU 80 are integrated by being accommodated in a storage case, and are configured as a battery unit U.

  Next, a mode in which the MOS switch 50 is switched on and off according to the operating state of the engine will be described. As described above, the SMR switch 60 is normally kept in the on state.

  At the automatic stop by the idle stop function, the MOS switch 50 is switched off (cut off). Further, the MOS switch 50 is switched off (cut off) at the time of start by a driver operation other than the initial start and at the time of automatic restart by the idle stop function. Thereby, the starter motor 41 is driven by receiving power supply from the lead storage battery 20.

  During deceleration regeneration, the MOS switch 50 is switched on (energized). When the terminal voltage of the lithium storage battery 30 is controlled to be lower than the terminal voltage of the lead storage battery 20, the power generated by the deceleration regeneration is mainly charged in the lithium storage battery 30. A part of the generated power is consumed by the electric loads 42 and 43 and charged to the lead storage battery 20.

  During non-regenerative power generation, such as during steady running, accelerated running, and idle running, the MOS switch 50 is switched on and off according to the SOC of the lithium storage battery 30.

  Specifically, the target SOC is set within the appropriate SOC range of the lithium storage battery 30. When the SOC of the lithium storage battery 30 is larger than the target SOC, the MOS switch 50 is turned off to prohibit charging of the lithium storage battery 30 and discharge from the lithium storage battery 30 to the electric load 43. In this case, electric power is supplied from the alternator 10 or the lead storage battery 20 to the electric load 42. On the other hand, when the SOC of the lithium storage battery 30 is equal to or lower than the target SOC, the MOS switch 50 is turned on. Then, when the alternator 10 is not driven, the lithium storage battery 30 is charged from the lead storage battery 20, and when the alternator 10 is driven, the alternator 10 or the alternator 10 and the lead storage battery 20 is charged to the lithium storage battery 30.

  Therefore, when the alternator 10, the electric loads 42 and 43, the lead storage battery 20, and the lithium storage battery 30 are energized, the lithium storage battery 30 is always supplied with power from the alternator 10 or the lead storage battery 20. On the other hand, when the alternator 10, the electric loads 42 and 43, the lead storage battery 20, and the lithium storage battery 30 are energized, the state in which the lithium storage battery 30 is not charged is abnormal. When such an abnormality occurs, the lithium storage battery 30 may continue to supply power to the electric loads 42 and 43 without being charged, and may be in an overdischarged state. Therefore, when the lithium storage battery 30 is not charged when the alternator 10, the electrical loads 42 and 43, the lead storage battery 20, and the lithium storage battery 30 are in conduction, the SMR switch 60 is switched off, and the alternator 10, electrical load 42 and 43 and the lead storage battery 20 and the lithium storage battery 30 are shut off. In addition, based on the detection value of the current sensor 32 provided in the lithium storage battery 30, when the charging current is not flowing into the lithium storage battery 30, it is determined that the lithium storage battery 30 is not charged. A case where the SMR switch 60 is switched off will be described below.

  (1) When the alternator 10 is driven and the lithium storage battery 30 is not charged while the MOS switch 50 and the SMR switch 60 are on, the SMR switch 60 is switched off.

  When the alternator 10, the electric loads 42 and 43, the lead storage battery 20, and the lithium storage battery 30 are in conduction and the alternator 10 is driven, the alternator 10 or the alternator 10 and the lead storage battery 20 is charged to the lithium storage battery 30. The state that is not performed is abnormal. When such an abnormality occurs, the lithium storage battery 30 may continue to supply power to the electric loads 42 and 43 without being charged, and may be in an overdischarged state. Therefore, when the alternator 10 is driven and the lithium storage battery 30 is not charged, the lithium storage battery 30 can be protected by switching the SMR switch 60 to OFF.

  (2) When the MOS switch 50 and the SMR switch 60 are on and the power consumption of the electric loads 42 and 43 is larger than the generated power of the alternator, the SMR switch 60 is switched off.

  The power consumption of the electric loads 42 and 43 is designed to be smaller than the power generation capacity of the alternator 10. However, the user may modify the audio device or the like to make the power consumption by the electric loads 42 and 43 larger than the power generation capacity of the alternator 10.

  When the amount of power consumed by the electric loads 42 and 43 is larger than the power generation capacity of the alternator 10, even if the alternator 10 is driven, all of the generated power is consumed by the electric loads 42 and 43, and the lithium storage battery 30 is not charged. Furthermore, since the power generated by the alternator 10 is not sufficient, power is supplied from the lithium storage battery 30 to the electric loads 42 and 43. Therefore, the lithium storage battery 30 may continue to be discharged without being charged, and may be in an overdischarged state. Therefore, when the power consumption of the electric loads 42 and 43 is larger than the generated power of the alternator, the lithium storage battery 30 can be protected by switching the SMR switch 60 to OFF. The current output from the alternator 10 minus the current charged to the lead storage battery 20 and the lithium storage battery 30 is the current flowing into the electrical loads 42 and 43. If this value is negative, the electrical load It is determined that the amount of power consumed by 42 and 43 is greater than the generated power of the alternator.

  (3) When the MOS switch 50 and the SMR switch 60 are on, it is determined whether or not the wiring 11 that electrically connects the alternator 10 and the lithium storage battery 30 is disconnected. The SMR switch 60 is switched off.

  If the wiring 11 that electrically connects the alternator 10 and the lithium storage battery 30 is disconnected, the generated power is not supplied to the lithium storage battery 30 even when the alternator 10 is driven. If power is supplied from the lithium storage battery 30 to the electric loads 42 and 43 in a state where the lithium storage battery 30 is not charged, the lithium storage battery 30 may be in an overdischarged state. Therefore, when the wiring 11 that electrically connects the alternator 10 and the lithium storage battery 30 is disconnected, the lithium storage battery 30 can be protected by switching the SMR switch 60 to OFF.

  (4) While the MOS switch 50 and the SMR switch 60 are on, it is determined whether the alternator 10 has failed. When it is determined that the alternator 10 has failed, the SMR switch 60 is switched off.

  If the alternator 10 is out of order, the power generated by the alternator 10 is not supplied to the lithium storage battery 30. Therefore, similarly to (3), the lithium storage battery 30 may be in an overdischarged state. Therefore, when the alternator 10 is out of order, the lithium storage battery 30 can be protected by switching the SMR switch 60 to OFF.

  (5) The SMR switch 60 is switched off when the MOS switch 50 and the SMR switch 60 are in the on state and when the start operation by the mechanical key is erroneously performed by the driver.

  When a start operation using a mechanical key is performed, power is normally supplied from the lead storage battery 20 to the starter motor 41 to drive the starter motor 41. Here, when the lithium storage battery 30 is being charged during operation of the engine, the driver may erroneously perform a start operation using a canal key. In addition, during the automatic stop by the idle stop function, the start operation by the mechanical key may be erroneously performed by the driver before the MOS switch 50 is turned off. When the starter motor 41 and the lithium storage battery 30 are energized, if the start operation by the mechanical key is mistakenly performed by the driver, the lithium storage battery 30 may supply a large amount of power to the starter motor 41 and enter an overdischarged state. Therefore, when the start operation by the mechanical key is performed when the starter motor 41 and the lithium storage battery 30 are energized, the lithium storage battery 30 can be protected by switching the SMR switch 60 to OFF.

  The first embodiment described above has the following effects.

  If the lithium storage battery 30 is not charged when the alternator 10, the electrical loads 42 and 43 and the lead storage battery 20 and the lithium storage battery 30 are energized, the alternator 10, the electrical loads 42 and 43 and the lead storage battery 20 and lithium The SMR switch 60 is switched to shut off the storage battery 30. Therefore, the lithium storage battery 30 can be protected when an abnormality occurs in the battery system.

(Second Embodiment)
A battery system according to the second embodiment is shown in FIG. With reference to FIG. 2, a configuration different from the battery system according to the first embodiment will be described. The battery system according to the second embodiment does not include the electrical load 42 connected to the alternator 10 and the MOS switch 50. The battery system according to the second embodiment includes an electrical load 44 instead of the electrical load 43 connected to the MOS switch 50 and the SMR switch 60. The electrical load 44 is an electrical load including both a general electrical load and a voltage stabilization required electrical load.

  Next, a mode in which the MOS switch 50 is switched on and off according to the operating state of the engine will be described. Note that the SMR switch 60 is normally kept on.

  At the time of automatic stop and automatic restart by the idle stop function, or at the time of start by the driver's operation, the MOS switch 50 is switched off. Further, at the time of automatic restart and at the time of start by the driver's operation, electric power is supplied from the lead storage battery 20 to the starter motor 41.

  During deceleration regeneration, the MOS switch 50 is switched on. When the terminal voltage of the lithium storage battery 30 is controlled to be lower than the terminal voltage of the lead storage battery 20, the power generated by the deceleration regeneration is mainly charged in the lithium storage battery 30. A part of the generated power is consumed by the electric load 44 and charged to the lead storage battery 20.

  When the alternator 10 is generating non-regenerative power and the SOC of the lithium storage battery 30 is larger than the target SOC, the MOS switch 50 is turned off to prohibit charging of the lithium storage battery 30 and the lithium storage battery 30 The load 44 is discharged. On the other hand, when the alternator 10 is generating non-regenerative power and the SOC of the lithium storage battery 30 is equal to or lower than the target SOC, the MOS switch 50 is turned on to charge the lithium storage battery 30 from the alternator 10 or the lead storage battery 20.

  Therefore, when the MOS switch 50 and the SMR switch 60 are turned on, the lithium storage battery 30 is always supplied with power from the alternator 10 or the lead storage battery 20. On the other hand, the state in which the lithium storage battery 30 is not charged when the alternator 10, the electrical load 44, the lead storage battery 20, and the lithium storage battery 30 are energized is abnormal. When such an abnormality has occurred, the lithium storage battery 30 may continue to supply power to the electric load 44 without being charged, and may enter an overdischarged state. Therefore, when the lithium storage battery 30 is not charged when the alternator 10, the electrical load 44 and the lead storage battery 20 and the lithium storage battery 30 are electrically connected, the SMR switch 60 is switched off, and the alternator 10, the electrical load 44, and the lead The storage battery 20 and the lithium storage battery 30 are shut off. Examples of switching off the SMR switch 60 include the cases (1) to (5) of the first embodiment.

  The second embodiment described above has the same effect as the first embodiment.

(Other embodiments)
-In each said embodiment, you may employ | adopt a nickel storage battery, a capacitor, and an AGM (Absorbent Glass Mat) livestock battery as a high performance storage battery of high output and high energy density. Since these high-performance storage batteries are also expensive, it is desirable to protect them when an abnormality occurs in the battery system.

  -The starter motor 41 of each said embodiment may be driven by the start operation which does not use a mechanical key at the time of the start by a driver | operator. For example, a starter motor that is driven in accordance with a transmission signal generated when a start switch is turned on may be used. In the case of a start operation that does not use a mechanical key, the transmission signal is blocked even if the driver makes a start operation by mistake, so that a large amount of power is not consumed by the starter motor. Therefore, when a starter motor driven by a start operation that does not use a mechanical key is employed, it is not necessary to perform control to protect the lithium storage battery 30 even if the driver performs an incorrect start operation.

  In each of the above embodiments, as the MOS switch 50 and the SMR switch 60, a semiconductor switch composed of a PIN diode or a thyristor, a solid state relay, or the like may be adopted.

  -The battery system which concerns on each said embodiment may be mounted in the vehicle which does not have an idle stop function.

  In each of the above embodiments, instead of the current sensors 21 and 32, a voltage sensor that detects the terminal voltage of the lead storage battery 20 and a voltage sensor that detects the terminal voltage of the lithium storage battery 30 may be provided. In this case, the SOC is calculated based on the detection value of the voltage sensor. Furthermore, when the terminal voltage of the lithium storage battery 30 does not increase, it is determined that the lithium storage battery 30 is not charged. Further, instead of the current sensors 21 and 32, a capacity sensor for detecting the SOC of the lead storage battery 20 and a capacity sensor for detecting the SOC of the lithium storage battery 30 may be provided. In this case, when the detected SOC of the lithium battery 30 does not increase, it is determined that the lithium storage battery 30 is not charged.

  DESCRIPTION OF SYMBOLS 10 ... Alternator, 20 ... Lead storage battery, 30 ... Lithium storage battery, 41 ... Starter motor, 42 ... Electric load, 43 ... Electric load, 50 ... MOS switch, 60 ... SMR switch, 80 ... ECU.

Claims (5)

A generator (10) driven by the output shaft of the engine to generate electricity, an electric load (41, 42, 43) electrically connected in parallel with the generator, and an electric load connected in parallel with the generator A lead storage battery (20) capable of charging the power generated by the generator, a high output capable of charging the power generated by the generator and the discharge power of the lead storage battery electrically connected in parallel with the power generator and the lead storage battery; A high energy storage battery (30) of high energy density, and electrically connected between the generator, the electrical load and the lead storage battery and the high performance storage battery, the generator, the electrical load and the lead storage battery; And an open / close switch (60) for switching between energization and interruption with the high-performance storage battery, and applied to a battery system in which the terminal voltage of the high-performance storage battery is controlled to be lower than the terminal voltage of the lead storage battery.
The battery system control device (80), wherein the open / close switch is switched to the cutoff when the open / close switch is switched to the energization and the high-performance storage battery is not charged.   The battery system control device according to claim 1, wherein the open / close switch is switched to the cutoff when the open / close switch is switched to the energization, the generator is driven, and the high-performance storage battery is not charged. .   The battery system control device according to claim 2, wherein the open / close switch is switched to the cutoff when the open / close switch is switched to the energization and the power consumption of the electric load is larger than the generated power of the generator.   The wire (11) for electrically connecting the generator and the high-performance storage battery is determined to be disconnected, and when it is determined that the wire is disconnected, the open / close switch is switched to the cutoff. The battery system control apparatus according to any one of 1 to 3. A starter motor (41) for starting the engine in response to a start operation by the mechanical key (75), a lead storage battery (20) electrically connected in parallel with the starter motor, the starter motor and the lead storage battery and the electrical A high-performance storage battery (30) connected in parallel to each other and electrically connected between the starter motor, the lead storage battery, and the high-performance storage battery, and the starter motor, the lead storage battery, and the An open / close switch (60) for switching between energization and shutoff with a high-performance storage battery, and a battery system comprising:
The battery system control device (80), wherein the open / close switch is switched to the cutoff when the open / close switch is switched to the energization and a start operation is performed by the mechanical key.

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