CN117048418A - Control device for a high-voltage battery and method for operating a control device - Google Patents

Control device for a high-voltage battery and method for operating a control device Download PDF

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Publication number
CN117048418A
CN117048418A CN202310524072.5A CN202310524072A CN117048418A CN 117048418 A CN117048418 A CN 117048418A CN 202310524072 A CN202310524072 A CN 202310524072A CN 117048418 A CN117048418 A CN 117048418A
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CN
China
Prior art keywords
control device
voltage battery
voltage
connection
intermediate circuit
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Pending
Application number
CN202310524072.5A
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Chinese (zh)
Inventor
F·匡特迈耶
M·芬代森
S·格莱斯
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Volkswagen AG
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Volkswagen AG
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Application filed by Volkswagen AG filed Critical Volkswagen AG
Publication of CN117048418A publication Critical patent/CN117048418A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
    • B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
    • B60L3/04—Cutting off the power supply under fault conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B60L58/14—Preventing excessive discharging
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00306—Overdischarge protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2310/00—The network for supplying or distributing electric power characterised by its spatial reach or by the load
    • H02J2310/40—The network being an on-board power network, i.e. within a vehicle
    • H02J2310/46—The network being an on-board power network, i.e. within a vehicle for ICE-powered road vehicles

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Energy (AREA)
  • Sustainable Development (AREA)
  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

A control device (1) for a high-voltage battery (2) in a motor vehicle (3), comprising at least a high-voltage battery (2) and a control apparatus (4) for the high-voltage battery (2); wherein the high-voltage battery (2) is connected to an electrical intermediate circuit (6) of the motor vehicle (3) via a switchable electrical first connection (5) and to the control device (4) via a switchable electrical second connection (7); wherein the control device (1) has a switching device (8) by means of which the first connection (5) and the second connection (7) can be switched such that in a first state of the switching device (1) the high-voltage battery (2) is connected to the intermediate circuit (6) and the control device (4) is connected to the high-voltage battery (2); wherein in the second state the high-voltage battery (2) is disconnected from the intermediate circuit (6) and the control device (4) is connected to the high-voltage battery (2), and in the third state the control device (4) is disconnected from the high-voltage battery (2) and connected to the intermediate circuit (6).

Description

Control device for a high-voltage battery and method for operating a control device
Technical Field
The invention relates to a control device for a high-voltage battery and a method for operating a control device. The control device and the high-voltage battery are intended in particular for a motor vehicle and are preferably arranged therein.
Background
In motor vehicles, for example, high-voltage batteries having a supply voltage of 48 volts have, in particular, a control device (battery management system BMS), which receives its voltage supply from the 48 volt supply voltage, i.e., the BMS is supplied by the battery cells of the high-voltage battery itself. The quiescent current consumption of the BMS is very low, and thus there is generally no problem even for a long standby period. However, if the defined duration is exceeded or if the 48 volt system fails, the high voltage electricity Chi Jiuhui discharges.
If the high-voltage battery is below a defined limit value of the voltage, the battery cells are irreversibly damaged and the high-voltage battery fails. If the voltage drops further, the BMS can no longer be powered. In this case, communication with the motor vehicle is neither possible via service devices (e.g. diagnostic test instruments) outside the motor vehicle, nor via CAN (controller area network, bus system).
This causes a number of problems. On the one hand, the high-voltage battery is irreversibly destroyed, resulting in high maintenance costs. On the other hand, internal faults of the high-voltage battery, which may also lead to discharges, cannot be diagnosed. Deep discharge of the high voltage battery and control equipment failure (e.g., failure of the controller or CAN transceiver) cannot be distinguished. Since lithium ion batteries are handled in particular as hazardous materials, certain regulations apply to the handling of these components. Furthermore, the classification of energy storages (batteries) for transportation and storage is performed according to the VDA procedure. The precondition for this is furthermore the determination of the state of the energy store, for which communication is necessary. If classification cannot be achieved, the energy store must be treated as faulty (critical) and a special procedure started (no longer transportable in standard packaging, stored in an isolated container, etc.). This sometimes creates additional costs.
High-voltage batteries are known which are designed with insulation between the battery voltage of the high-voltage battery and the voltage supply of the control device (BMS). This is necessary for safety reasons (high voltage level of high voltage battery). This technique is particularly useful for all known 48 volt batteries. The BMS is thus powered by a 12 volt voltage source in the motor vehicle. The problems described at the beginning do not exist here.
The cost for isolating the different supply voltages increases the direct cost of the high voltage battery. In addition, the energy supply safety is low because the high voltage contactor and the BMS are generally supplied with power by 12 volt voltage supply and not by 48 volt voltage supply of the high voltage battery.
A control device for a high-voltage battery and a method for operating a control device are known from DE 10 2020 110 174 A1.
Document US 2020/0353842 A1 discloses a method for controlling a battery of a motor vehicle.
Disclosure of Invention
The object of the present invention is therefore to at least partially solve the problems described in the prior art. In particular, a control device for a high-voltage battery is proposed, by means of which, on the one hand, high safety with respect to the energy supply of a control device for the control device can be ensured and, on the other hand, the state of the high-voltage battery can be reliably determined.
The features specified in the claims can be combined with one another in a technically suitable manner and can be supplemented by details from the description and/or the drawings, in which further variants of the invention are specified.
A control device for a high-voltage battery in a motor vehicle is proposed. The high-voltage battery is especially designed for use in motor vehicles. The control means comprise at least one high voltage battery and a control device (or called a control instrument) for the high voltage battery. The high-voltage battery is connected to an electrical intermediate circuit of the motor vehicle via a switchable electrical first connection and to the control device via a switchable electrical second connection. The control device has a switching device by means of which the first connection and the second connection can be switched such that in a first state of the switching device the high-voltage battery is connected to the intermediate circuit and the control device is connected to the high-voltage battery. In the second state the high voltage battery is disconnected from the intermediate circuit (while the control device continues to be connected to the high voltage battery), and in the third state the control device is disconnected from the high voltage battery and connected to the intermediate circuit. The control device is connected to the intermediate circuit via a first diode such that current can only flow from the intermediate circuit to the control device.
Diodes are in particular electronic components which allow current to pass in one direction and block current in the other. Thus involving a flow direction and a cut-off direction. The flow direction here extends from the intermediate circuit to the control device.
The high voltage battery is designed to be suitable for providing a first supply voltage of at least 30 volts, in particular at least 40 volts, preferably at least 45 volts. In particular the first supply voltage is 48 volts.
If the high-voltage battery is able to supply sufficient energy for operating the control device, the control device is connected in the control means with the high-voltage battery to supply a supply voltage (or what is called mains voltage). In particular, no further battery is specified in the motor vehicle, via which the control device is supplied with the supply voltage.
The high-voltage battery is connected, in particular, on the one hand, to an electrical ground. The grounding means are conductors which are usually provided with zero potential, which represents in particular the reference potential for all signals and operating/supply voltages of the control means.
The high-voltage battery can on the other hand be connected via a first connection to an intermediate circuit or to an electrical consumer of the motor vehicle, or can be connected to the motor vehicle when the control device is arranged in the motor vehicle. The electrical consumer of the motor vehicle is thus connected electrically conductively to the high-voltage battery via the first connection.
The control device is connected in particular on the one hand to a grounding device. On the other hand, the control device is connected to the high-voltage battery via a second connection. The first connection may be disconnected by the control device or re-established if necessary. For this purpose, a first switch, for example a bistable relay or a MosFET switch, is provided, which can be controlled by a control device.
Bistable relays can have two different stable switch states in the no-current state.
In particular, the first switch can keep the first connection open even in the absence of a supply voltage. That is, if the high voltage battery cannot provide a sufficient supply voltage, the first switch disconnects the high voltage battery from the intermediate circuit.
In particular, the first connection can be disconnected only by the control device or, if necessary, can be reestablished. In particular, the first switch is thus actuated only by the control device.
The control device or the switching device can be designed such that it only exactly allows three of the states.
In particular, the control device is connected to the high-voltage battery via a first voltage converter. The second supply voltage generated by the first voltage converter is lower than the first supply voltage provided by the high voltage battery to the first voltage converter and the intermediate circuit. In the third state, the control device is connected to the intermediate circuit via the first voltage converter and the first diode.
In particular, in the first state of the switching device, the high-voltage battery is connected to the intermediate circuit, and the control device is connected to the high-voltage battery. In the second state, the high-voltage battery is disconnected from the intermediate circuit, and the control device is connected to the high-voltage battery. In the third state, the high-voltage battery is disconnected from the intermediate circuit and the control device, and the control device is connected to the intermediate circuit.
The first voltage converter is arranged in particular between the high-voltage battery and the control device, in particular between the first switch and the control device.
In particular, the second supply voltage is at most 50% of the first supply voltage. In particular, the second supply voltage is at most 20 volts, preferably at most 15 volts. In particular the second supply voltage is 12 volts.
Preferably, the second supply voltage is at most 10 volts, in particular at most or exactly 5 volts or 3.3 volts.
In particular, the switching device has a first switch for establishing the first connection, wherein the intermediate circuit can be switchably connected to the high-voltage battery via the first switch.
In particular, the switching device has a second switch for establishing a second connection, via which the control device can be switchably connected to the high-voltage battery.
In particular, by means of the second switch, only one electrically conductive second connection, i.e. the connection between the control device and the high-voltage battery, can be established or disconnected.
In particular, the second switch can only be switched by the control device.
In particular, the high-voltage battery is connected to the second switch via a second diode, so that current can only flow from the high-voltage battery to the second switch.
In particular, the second switch and the first diode are arranged such that only the control device is connected to the high-voltage battery when the second connection is established.
The first diode is in particular arranged such that no (or substantially no) current can flow through the first diode to the intermediate circuit when the second connection between the control device and the high voltage battery is established.
In particular, the electrical connection is designed such that, without the first diode and with the second connection established, current can flow from the high-voltage battery to the intermediate circuit (but this is prevented by the first diode).
In particular, the second switch and the second diode are arranged such that no (or substantially no) current can flow through the second diode to the high-voltage battery, in particular no current is supplied by the intermediate circuit, when the second connection between the control device and the high-voltage battery is established.
In particular, the electrical connection is designed such that, without the second diode and in the case of a second connection being established, current can flow from the intermediate circuit and/or from the control device to the high-voltage battery (but this is prevented by the second diode).
In particular, the first connection and/or the second connection is formed by a MosFET switch.
In particular, the mos fet switch has a gate terminal, a source terminal and a drain terminal. If the first switch is designed as a mos fet switch, the control device forms a gate terminal, and the high voltage battery and the intermediate circuit form one of a source terminal and a drain terminal, respectively. If the second switch is designed as a mos fet switch, the control device forms a gate terminal, and the high voltage battery and the control device form one of a source terminal and a drain terminal, respectively.
In particular, the second switch is a bistable relay, which can have two different stable switching states in the no-current state. In particular, the second switch may cause the disconnection of the second connection in the absence of a supply voltage (due to the high-voltage battery, the intermediate circuit or the control device).
In particular, the second connection may be switched and/or established only by the control device. In particular, the second switch is thus actuated only by the control device.
The control device comprises in particular a system base chip. Communication of the control device with the motor vehicle takes place in particular via the system base chip, for example via CAN. The system base chip has, inter alia, an LDO (low drop out) controller. The LDO controller may regulate the output voltage, among other things, if the output voltage is very similar to the input voltage. Through the LDO regulator, the microcontroller of the control device can be operated with a fourth supply voltage via a third connection.
The control device comprises in particular a microcontroller. The microcontroller is particularly capable of operating at a fourth supply voltage. The fourth supply voltage is in particular at most 50% of the second supply voltage, for example 3.3 volts or 5 volts.
The microcontroller controls in particular the core components of the device and in particular all the processes within the control device. In particular, the microcontroller is connected to the analog front end via a communication channel. The cell voltage and the battery current of the high-voltage battery are detected in particular by the analog front end.
The analog front end is in particular a circuit for converting and processing analog signals into digital signals. The analog front end in particular detects the analog signal of the high-voltage battery and transmits it as a digital signal to the microcontroller.
The switching device can be actuated in particular by the microcontroller. In particular, the first connection and the second connection can thereby be restored, in particular independently of one another, by actuation of the first switch and/or the second switch, or the first switch switching the first connection and/or the second switch switching the second connection can be controlled or actuated.
The control device or the microcontroller can determine the current state of charge of the high-voltage battery, in particular continuously, during operation of the high-voltage battery. Such determination or detection may be performed according to known methods, such as static voltage measurement and current integration and/or by complex cell models.
In particular, it is possible for the control device or the microcontroller to detect when the limit value for the state of charge is below and/or above.
In particular, when the state of charge (SOC operating range) specified for normal operation of the high-voltage battery is exceeded, a warning CAN be transmitted to the motor vehicle via the control device, for example via the CAN. In addition or alternatively, an error input may be made, for example, in the control device, in particular in a nonvolatile memory of the control device.
On the one hand, the control device ensures that the control device is connected to the high-voltage battery when sufficient energy is supplied by the high-voltage battery. In this case, the high-voltage battery can be disconnected from the intermediate circuit by the control device, in particular by disconnecting the first connection, below a first limit value of the state of charge of the high-voltage battery.
Furthermore, it can be ensured by the control device that the control device can also be disconnected from the high-voltage battery, in particular by disconnecting the second connection, if the second limit value of the state of charge of the high-voltage battery is undershot. The control device is thereby kept connected to the intermediate circuit, so that it can be operated with a sufficient supply voltage, for example by means of a starter generator, in particular a belt starter generator, arranged in the intermediate circuit.
For example, it is required in DE 10 2020 110 174 A1 (here via the first switch) to establish a connection between the control device and the intermediate circuit via the switch, in particular it is not required here, since only a current in one direction is possible via the first diode.
Furthermore, a method for operating a control device for a high-voltage battery is proposed. The high-voltage battery is intended in particular for use in motor vehicles. The method is performed in particular when the high-voltage battery is arranged in a motor vehicle.
As described above, the control apparatus includes at least one high-voltage battery and the control device for the high-voltage battery. The high-voltage battery is connected to an electrical intermediate circuit of the motor vehicle via a switchable electrical first connection and to the control device via a switchable electrical second connection. The control device has a switching device by means of which the first connection and the second connection can be switched such that in a first state of the switching device the high-voltage battery is connected to the intermediate circuit and the control device is connected to the high-voltage battery. In the second state the high voltage battery is disconnected from the intermediate circuit (while continuing to be connected to the control device), and in the third state the control device is disconnected from the high voltage battery and connected (only) to the intermediate circuit.
Starting from a first state of the switching device, the method comprises at least the following steps:
a) Determining, by the control device, a current state of charge of the high voltage battery;
if the current state of charge is below the limit value
b) A third state is established.
The above-described non-closed division of method steps into a) and b) is mainly used only for distinguishing, not for enforcing order and/or association. The frequency of the method steps may for example be changed during setup and/or operation of the system. It is also possible that the method steps overlap at least partially in time. Very particular preference is given to carrying out the process step a) continuously. In particular steps a) and b) are carried out in the order indicated.
In particular, the following steps are performed before step b):
i. execute step a) and
if the current state of charge is below the first limit value
Establishing a second state, and
performing step a) and
if the current state of charge is below the second limit value
And iv, executing the step b).
The first connection may in particular be disconnected by the control device or re-established if necessary. For this purpose, a first switch, for example a bistable relay or a MosFET, is provided, which can be controlled by a control device.
In particular, the first switch can keep the first connection open even in the absence of a supply voltage. That is, if the high voltage battery cannot provide a sufficient supply voltage, the first switch disconnects the high voltage battery from the intermediate circuit.
In particular, the first connection can be disconnected only by the control device or, if necessary, can be reestablished. In particular, the first switch is thus actuated only by the control device.
In particular, the switching device has a second switch, by means of which the control device can be connected to or disconnected from the high-voltage battery (only).
The first switch can in particular disconnect the intermediate circuit from the high-voltage battery, but cannot disconnect the high-voltage battery from the control device.
In particular step a) is carried out continuously at least until step b) is carried out. In particular steps i.through iv. Are performed in the order shown.
In particular, the second limit value is smaller than the first limit value. In particular, the method is carried out during a decrease in the state of charge of the high-voltage battery.
In particular, the high-voltage battery should be protected by this method.
In particular according to step ii. In this way, it is possible to achieve that the first connection between the high-voltage battery and the intermediate circuit, in particular the electrical consumer arranged in the motor vehicle, is interrupted, so that the high-voltage battery does not continue to discharge through the motor vehicle.
The first limit value is in particular between 10 and 20%, preferably 15%, of the rated charge state, i.e. the rated charge capacity of the high-voltage battery. The usual operating range for the use of high-voltage batteries in motor vehicles includes, in particular, a state of charge of 30 to 100% of the nominal state of charge.
The second limit value is in particular less than 12%, preferably 10%, of the nominal state of charge.
After step ii, the high-voltage battery is connected to the control device, in particular only (via the second connection). The control device has a significantly lower energy requirement than a motor vehicle in particular. In particular, the motor vehicle is continuously connected to the control device, or CAN continue to communicate with the control device, for example via CAN.
If it is below the second limit value, the second connection is also broken, i.e. the control device is also disconnected from the high-voltage battery. In this way, after step b), in particular no further electrical appliances are connected to the high-voltage battery.
In particular immediately before step b), a status signal is set in the non-volatile memory of the control device. The state of the high-voltage battery is stored in the control device via the state signal, so that the state can be read out of the control device, for example via a service plug or a service device external to the motor vehicle. Alternatively or additionally, the status signal CAN be transmitted to the central control unit via the CAN. By storing or transmitting the status signal, a fault diagnosis of the high-voltage battery can be performed even after the high-voltage battery is completely discharged and/or damaged.
After step b), the control device no longer supplies voltage via the high-voltage battery, so that the high-voltage battery is no longer discharged by the internal electronics of the control device. The high-voltage battery is in particular self-discharging, wherein the self-discharge amount changes per month, for example, within a maximum of 2% of the rated charge state.
The control device ensures in particular that the control device is disconnected from the high-voltage battery and remains connected to the intermediate circuit when the second limit value of the state of charge of the high-voltage battery is lower. The connection between the control device and the intermediate circuit cannot be changed (i.e. disconnected or connected) in particular by switching.
In particular, the control device can be operated with a sufficient supply voltage, for example by a starter generator arranged in the intermediate circuit.
In particular, after step b) has been carried out, a third supply voltage is applied to the intermediate circuit by the motor vehicle after the motor vehicle has been put into operation.
The commissioning of the motor vehicle includes, for example, starting an ignition device. In particular, the central control unit wakes up here and CAN determine that the high-voltage battery is no longer in communication with the central control unit, for example via CAN.
The precharge of the intermediate circuit is initialized to a determined voltage value, in particular by the central control unit, by means of a second voltage converter arranged in the intermediate circuit. The third supply voltage can be applied to the control device via a connection to the intermediate circuit. The third supply voltage is applied in particular to the first voltage converter, which then applies the second supply voltage to the control device. The third supply voltage corresponds in particular with respect to the voltage value to the first supply voltage.
The supply voltage from the intermediate circuit is applied to the control device, enabling the communication of the control device with the central control unit to resume. The information of the high-voltage battery can thus be transmitted to the central control unit.
By means of a test run of the motor vehicle, for example, a starter generator, in particular a belt starter generator, is operated, which can be used to generate a third supply voltage.
By restoring the communication of the control device with the central control unit, the second voltage converter may be arranged to regulate the third supply voltage such that the third supply voltage in the intermediate circuit is regulated to the first supply voltage of the high voltage battery. After the third supply voltage and the first supply voltage have been equalized, the first connection may be switched on again, so that the high-voltage battery is connected to the intermediate circuit.
In particular, the switching device is actuated by the control device and the high-voltage battery is connected to the intermediate circuit via the first connection.
The control commands for actuating the switching device are thus triggered, in particular, by a control device or a microcontroller.
In particular, the third supply voltage present in the intermediate circuit is regulated to the first supply voltage of the high-voltage battery before the high-voltage battery is connected to the intermediate circuit.
In particular, after the first connection has been established, the high-voltage battery is charged via the intermediate circuit.
In particular, the control device can derive the current state of charge, for example, from the last stored state signal and taking into account the self-discharge of the high-voltage battery. If it is determined by the control device that the state of charge is below the third limit value, the first connection is prevented from being established.
A value below the third limit value indicates in particular that the high-voltage battery is at least partially damaged, possibly irreversible, and thus prevents the first connection from being established. In particular, the status signal already stored in the control device enables a diagnosis of a fault of the high-voltage battery.
The third limit value is in particular at most 0.5%, preferably 0%, of the nominal state of charge.
In particular, after step b), the control device is reconnected to the high-voltage battery via the second connection only if the high-voltage battery reaches a state of charge exceeding the fourth limit value. The second connection, i.e. the connection between the high-voltage battery and the control device, i.e. the first state, is only re-established when the high-voltage battery reaches a sufficient state of charge, which can ensure that the control device is supplied with the first supply voltage. The second connection is reestablished, in particular, by the control device.
The fourth limit value is located in particular between the third limit value and the second limit value or between the second limit value and the first limit value.
By this method or by this control device, on the one hand, the high-voltage battery can be protected against deep discharge, since the high-voltage battery can be disconnected from all consumers by the switching device, including the control device of the high-voltage battery. Furthermore, the high voltage battery and the control device may be automatically re-enabled after such disconnection. The re-activation takes place by commissioning of the intermediate circuit or the motor vehicle. In this case, the control device is first re-activated and the state of charge of the high-voltage battery is queried or determined. The high-voltage battery is then connected to the intermediate circuit and charged if necessary. If a sufficient state of charge of the high-voltage battery is reached, the control device can be reconnected to the high-voltage battery, so that the control device can be supplied with the first supply voltage, in particular only from the high-voltage battery.
The use of at least one diode makes it possible to dispense with the switching contact. The control device can thus be designed more reliably and thus less susceptible to faults.
The control device, in particular the central control unit, of the control apparatus is equipped, configured or programmed to carry out the method.
Furthermore, the method may also be performed by a processor of a computer or a control device.
A system for data processing is therefore also proposed, comprising a processor adapted/configured to perform the method or part of the steps of the proposed method.
A computer readable storage medium may be provided comprising instructions which, when executed by a computer/processor, enable the computer/processor to perform at least part of the steps of the method or the proposed method.
The description of the method may in particular be transferred to a control device or a computer implemented method (i.e. a computer or a processor, a data processing system, a computer readable storage medium) and vice versa.
In particular, the high-voltage battery can also be operated autonomously (i.e. without a motor vehicle or without being installed in a motor vehicle), wherein the high-voltage battery or the proposed control device has no further voltage supply or voltage source and/or insulation between the supply voltage of the high-voltage battery and the supply voltage of the control device.
The use of the indefinite article "a" or "an" is not to be interpreted as an item, especially in the claims and specification interpreting the claim. Accordingly, the relevant terms and components are understood to mean that they are present at least once, but may also be present in particular a plurality of times.
It is noted that ordinal terms ("first", "second"..) used herein are mainly (solely) used for distinguishing between a plurality of like objects, amounts or processes, i.e., not necessarily for specifying, inter alia, the association and/or order of such objects, amounts or processes with each other. Where association and/or sequence is desired, it is explicitly stated herein or will be obvious to one skilled in the art when studying the specifically described design. The description of a component applies equally to all or most of that component, provided that it can appear multiple times (at least one), but this is not necessarily so.
Drawings
The invention and the technical field are further elucidated below with reference to the accompanying drawings. It is noted that the present invention is not limited by the embodiments. In particular, if not explicitly stated otherwise, some aspects may be extracted from the facts set forth in the figures and combined with other components and knowledge from the present description. It is to be expressly noted that the drawings and the dimensional relationships particularly shown are merely schematic. Wherein:
fig. 1: motor vehicle
Fig. 2: a control device for a motor vehicle.
Detailed Description
Fig. 1 shows a motor vehicle 3. Fig. 2 shows a control device 1 of a motor vehicle 3. Fig. 1 and 2 are described together below.
The motor vehicle 3 comprises a high-voltage battery 2 with a control device 1, a belt-type starter generator 22, a second voltage converter 21, a 12-volt subnetwork 24 and a central control unit 23. The high-voltage battery 2 and the control device 1 are connected to a second voltage converter 21 and a belt-start generator 22 via an intermediate circuit 6. The high voltage battery 2 may be charged by a belt-driven generator 22 through an intermediate circuit 6. The high voltage battery 2 cannot be connected to the 12 volt sub-network 24.
The control device 1 comprises a high-voltage battery 2 and a control apparatus 4 for the high-voltage battery 2. The high-voltage battery 2 is connected to an electrical intermediate circuit 6 of the motor vehicle 3 via a switchable electrical first connection 5 and to the control device 4 via a switchable electrical second connection 7. The control device 1 has a switching device 8 via which the first connection 5 and the second connection 7 can be switched such that in a first state of the switching device 8 the high-voltage battery 2 is connected to the intermediate circuit 6 and the control device 4 is connected to the high-voltage battery 2. In the second state (as the only difference from the first state) the high voltage battery 2 is disconnected from the intermediate circuit 6 and in the third state (as the only difference from the second state) the control device 4 is disconnected from the high voltage battery 2. The control device 4 is connected to the intermediate circuit 6 in all states. The control device 4 is connected to the intermediate circuit 6 via a first diode 9. The diode 9 ensures that current can only flow from the intermediate circuit 6 to the control device 4.
If the high-voltage battery 2 is able to supply sufficient energy for operating the control device 4, the control device 4 is connected in the control apparatus 1 to the high-voltage battery 2 for providing the first supply voltage 13. That is to say that no further battery is provided in motor vehicle 3, via which control device 4 is supplied with supply voltage.
The high-voltage battery 2 is connected to a grounding device 26. The high-voltage battery 2 can be connected, on the other hand, via a first connection 5 to an intermediate circuit 6 or to an electrical consumer of the motor vehicle 3. The electrical consumer of motor vehicle 3 is thus electrically conductively connected to high-voltage battery 2 via first connection 5.
The control device 4 is connected on the one hand to a grounding means 26. On the other hand, the control device 4 is connected to the high voltage battery 2 via a second connection 7. The first connection 5 can be disconnected by the control device 4 or re-established if necessary. For this purpose, a first switch 15, for example a bistable relay, is provided, which can be controlled by the control device 4 via a control command 20.
The first switch 15 keeps the first connection 5 open even in the absence of the first supply voltage 13. That is, if the high voltage battery 2 cannot provide a sufficient first supply voltage 13, the first switch 15 disconnects the high voltage battery 2 from the intermediate circuit 6.
The first connection 5 may be disconnected only by the control device 4 or re-established if necessary. The first switch 15 is thus only operated by the control device 4.
The control device 4 is connected to the high-voltage battery 2 via a first voltage converter 12. However, the control device 4 can also be connected directly to the high-voltage battery 2 without the first voltage converter 12.
The second supply voltage 14 generated by the first voltage converter 12 is lower than the first supply voltage 13 provided by the high voltage battery 2 for the first voltage converter 12 and the intermediate circuit 6. In the third state, the control device 4 is connected via the first voltage converter 12 only to the intermediate circuit 6 (and no longer to the high-voltage battery 2).
The first voltage converter 12 is arranged between the high-voltage battery 2 and the control device 4 or between the second switch 16 and the control device 4.
The switching device 8 has a second switch 16, via which the control unit 4 can be switchably connected to the high-voltage battery 2. The second switch 16 may only disconnect the high voltage battery 2 from the control device 4.
The high voltage battery 2 is connected to a second switch 16 via a second diode 10. The second diode 10 is arranged such that current can only flow from the high voltage battery 2 to the second switch 16.
The second switch 16 and the first diode 9 are arranged such that, when the second connection 7 is established, only the control device 4 is connected to the high-voltage battery 2, wherein the control device 4 is permanently connected to the intermediate circuit 6 via the first diode 9.
The first diode 9 is arranged such that no (or substantially no) current can flow through the first diode 9 to the intermediate circuit 6 when the second connection 7 between the control device 4 and the high voltage battery 2 is established.
The electrical connections 5, 7 are designed such that, without the first diode 9 and with the second connection 7 established, current can flow from the high-voltage battery 2 to the intermediate circuit 6 (but this is prevented by the first diode 9).
The second switch 16 and the second diode 10 are arranged such that no (or substantially no) current can flow through the second diode 10 to the high voltage battery 2 when the second connection 7 between the control device 4 and the high voltage battery 2 is established, nor is there any current provided by the intermediate circuit 6.
The electrical connections 5, 7 are designed such that, without the second diode 10 and with the second connection 7 established, current can flow from the intermediate circuit 6 and/or from the control device 4 to the high-voltage battery 2 (but this is prevented by the second diode 10).
The second connection 7 is formed by a mos fet switch. The mos fet switch has a gate terminal, a source terminal and a drain terminal. Here, the control device 4 forms a gate terminal, and the high-voltage battery 2 and the control device 4 form one of a source terminal and a drain terminal, respectively.
The second connection 7 may be switched and/or established only by the control device 4.
The first switch 15 can cause the first connection 5 to open without the high voltage battery 2 causing the first supply voltage 13.
The first connection 5 may be re-established only by the control device 4. The first switch 15 is thus only operated by the control device 4 by means of the control command 20. The control command 20 is converted here by the amplifier circuit 11, so that the second switch 16, which is designed as a mos fet, is actuated.
The control device 4 comprises a system base chip 25. Communication between the control device 1 and the motor vehicle 3 takes place via the system base chip 25 via the CAN 30. The system base chip 25 has an LDO (low drop out) controller. The LDO controller may regulate the output voltage if the output voltage is very similar to the input voltage. Through the LDO regulator, the microcontroller 28 of the control device 4 can be operated with a fourth supply voltage 31 via a third connection 29.
The microcontroller 28 is a core component of the control device 4 and controls all processes within the control device 4. The microcontroller 28 is connected to the analog front end 27 via a communication channel. The cell voltage of the high-voltage battery 2, and the battery voltage and the battery current are detected by the analog front end 27.
The switching device 8 can be actuated by means of the microcontroller 28. The first connection 5 and the second connection 7 can thus be reestablished, in particular independently of one another, by actuating the first switch 15 and/or the second switch 16, the first switch 15 switching the first connection 5 and the second switch 16 switching the second connection 7 being controllable or actuated by a control command 20.
The control device 4 and/or the microcontroller 28 can continuously determine the current state of charge of the high-voltage battery 2 during operation of the high-voltage battery 2. Such determination or detection may be performed according to known methods, such as static voltage measurement and current integration and/or by complex cell models.
In particular, it is possible by the control device 4 and/or the microcontroller 28 to detect when a limit value for the state of charge is below and/or above.
When the state of charge (SOC operating range) specified for normal operation of the high-voltage battery 2 is exceeded, a warning CAN be transmitted to the motor vehicle 3 via the CAN30 by the control device 4. In addition or alternatively, an error input may be made, for example, in the control device 4, for example in a non-volatile memory 17 of the control device 4.
On the one hand, the control device 1 ensures that the control device 4 is connected to the high-voltage battery 2 when sufficient energy is supplied by the high-voltage battery 2. In this case, the high-voltage battery 2 can be disconnected from the intermediate circuit 6 (first connection 5 is disconnected) by the control device 4 below a first limit value of the state of charge of the high-voltage battery 2.
Furthermore, it can be ensured by the control device 1 that the control device 4 can also be disconnected from the high-voltage battery 2 (second connection 7 disconnected) if the second limit value of the state of charge of the high-voltage battery 2 is undershot. The control device 4 remains connected to the intermediate circuit 6, so that the control device 4 can be operated with a sufficient third supply voltage 19, for example, by means of a belt-driven generator 22 arranged in the intermediate circuit 6.
According to step a) of the method, starting from a first state of the switching device 8, a current state of charge of the high-voltage battery 2 is determined by the control device 4; and if the current state of charge is below the second limit value, establishing a third state according to step b).
Before this step b) and according to step i. It is the step a) that is performed and,
if the current state of charge is below the first limit value, a second state is established according to step ii, and step a) is performed according to step iii, and step b) is performed according to step iv if the current state of charge is below the second limit value.
The second limit value is lower than the first limit value. The method is performed during a decrease in the state of charge of the high-voltage battery 2. The high-voltage battery 2 is protected against deep discharge by this method.
The first connection 5 is broken according to step ii. In this way, it is possible to interrupt the first connection 5 between the high-voltage battery 2 and the intermediate circuit 6 and the electrical consumer arranged in the motor vehicle 3, so that the high-voltage battery 2 does not continue to discharge via the motor vehicle 3.
After step ii, the high-voltage battery 2 is connected only (via the second connection 7) to the control device 4. Furthermore, the high-voltage battery 2 (together with the control device 4) is connected to the intermediate circuit 6 via a first diode 9. However, in this case current can only flow from the intermediate circuit 6 to the high-voltage battery 2 and the control device 4. The control device 4 has a significantly lower energy requirement than the motor vehicle 3. The motor vehicle 3 continues to be connected to the control device 4 or CAN continue to communicate with the control device 4, for example via the CAN 30.
If it is below the second limit value, the second connection 7 is also disconnected, i.e. the control device 4 is also disconnected from the high-voltage battery 2. Whereby after step b) no further electrical appliances are connected to the high voltage battery 2.
Immediately before step b), a status signal 18 is set in the non-volatile memory 17 of the control device 4. The state of the high-voltage battery 2 is stored in the control device 4 via the state signal 18, so that the state can be read out of the control device 4, for example via a service plug or a service device external to the motor vehicle. Alternatively or additionally, the status signal 18 CAN be transmitted to the central control unit 23 via the CAN 30. By storing or transmitting the status signal 18, a fault diagnosis of the high-voltage battery 2 can be performed even after the high-voltage battery 2 is completely discharged and/or damaged.
After step b), the control device 4 no longer supplies a voltage via the high-voltage battery 2, so that the high-voltage battery 2 is no longer discharged by the internal electronics of the control apparatus 1. The high-voltage battery 2 can only be self-discharged, wherein the self-discharge amount changes every month, for example, within a maximum of 2% of the rated charge state.
The control device 1 ensures that the control apparatus 4 is disconnected from the high-voltage battery 2 and remains connected (only) to the intermediate circuit 6 when the second limit value of the state of charge of the high-voltage battery 2 is lower. The control device 4 can thus be operated with a sufficient third supply voltage 19 by means of a belt-driven generator 22 arranged in the intermediate circuit 6.
After step b) has been performed and after the test run of motor vehicle 3, a third supply voltage 19 is applied to intermediate circuit 6 via motor vehicle 3.
The commissioning of the motor vehicle 3 includes activating the ignition. The central control unit 23 is thereby woken up and CAN determine that the high-voltage battery 2 is no longer in communication with the central control unit 23, for example via the CAN 30.
If the control unit 23 confirms that no communication is performed, the precharge of the intermediate circuit 6 may be initialized to a determined voltage value by the central control unit 23 through the second voltage converter 21 arranged in the intermediate circuit 6. The third supply voltage 19 can be applied to the control device 4 of the control apparatus 1 via a connection to the intermediate circuit 6. The third supply voltage 19 is applied to the first voltage converter 12 which then applies the second supply voltage 14 to the control device 4. The third supply voltage 19 corresponds in voltage value to the first supply voltage 13.
The third supply voltage 19 originating from the intermediate circuit 6 is applied to the control device 4, enabling the communication of the control device 4 with the central control unit 23 to resume. The information of the high-voltage battery 2 can thus be transmitted to the central control unit 23.
By restoring the communication of the control device 4 with the central control unit 23, the second voltage converter 21 may be arranged to regulate the third supply voltage 19 such that the third supply voltage 19 in the intermediate circuit 6 is regulated to the first supply voltage 13 of the high voltage battery 2. After the third supply voltage 19 and the first supply voltage 13 have been equalized, the first connection 5 can be switched on again, so that the high-voltage battery 2 is connected to the intermediate circuit 6.
The switching device 8 is actuated by the control device 4 and the high-voltage battery 2 is connected to the intermediate circuit 6 via the first connection 5. The control commands 20 for actuating the switching device 8 are triggered by the control apparatus 4 and/or the microcontroller 28.
The third supply voltage 19 present in the intermediate circuit 6 is regulated to the first supply voltage 13 of the high-voltage battery 2 before the high-voltage battery 2 is connected to the intermediate circuit 6. After the first connection 5 is established, the high-voltage battery 2 is charged via the intermediate circuit 6.
The current state of charge can be derived by the control device 4, for example from the last stored state signal 18 and taking into account the self-discharge of the high-voltage battery 2. If it is determined by the control device 4 that the state of charge is below the third limit value, the first connection 5 is prevented from being established.
A value below the third limit value indicates that the high voltage battery 2 is at least partially damaged, possibly irreversible, and thus prevents the first connection 5 from being established. The status signal 18, which is stored in particular in the control device 4, enables a diagnosis of a fault of the high-voltage battery 2.
After step b), the control device 4 is reconnected to the high-voltage battery 2 via the second connection 7 only if the high-voltage battery 2 reaches a state of charge exceeding the fourth limit value. The second connection 7, i.e. the connection between the high-voltage battery 2 and the control device 4, i.e. the first state, is only re-established when the high-voltage battery 2 reaches a sufficient state of charge, which can ensure that the control device 4 is supplied with the first supply voltage 13. The second connection 7 is re-established by the control device 4.
List of reference numerals:
1. control device
2. High-voltage battery
3. Motor vehicle
4. Control apparatus
5. First connection
6. Intermediate circuit
7. Second connection
8. Switching device
9. First diode
10. Second diode
11. Amplifying circuit
12. First voltage converter
13. First supply voltage
14. Second supply voltage
15. First switch
16. Second switch
17. Memory device
18. Status signal
19. Third supply voltage
20. Control commands
21. Second voltage converter
22. Belt-started generator
23. Control unit
24. Sub-network
25. System base chip
26. Grounding device
27. Analog front end
28. Micro controller
29. Third connection
30 CAN
31. Fourth supply voltage

Claims (10)

1. A control device (1) for a high-voltage battery (2) in a motor vehicle (3), comprising at least a high-voltage battery (2) and a control apparatus (4) for the high-voltage battery (2); wherein the high-voltage battery (2) is connected to an electrical intermediate circuit (6) of the motor vehicle (3) via a switchable electrical first connection (5) and to the control device (4) via a switchable electrical second connection (7); wherein the control device (1) has a switching device (8) by means of which the first connection (5) and the second connection (7) can be switched such that in a first state of the switching device (1) the high-voltage battery (2) is connected to the intermediate circuit (6) and the control device (4) is connected to the high-voltage battery (2); wherein in the second state the high-voltage battery (2) is disconnected from the intermediate circuit (6) and the control device (4) is connected to the high-voltage battery (2), and in the third state the control device (4) is disconnected from the high-voltage battery (2) and connected to the intermediate circuit (6); wherein the control device (4) is connected to the intermediate circuit (6) via a first diode (9) such that current can only flow from the intermediate circuit (6) to the control device (4).
2. The control device (1) according to claim 1, wherein the control means (4) is connected to the high-voltage battery (2) via a first voltage converter (12), wherein a second supply voltage (14) generated by the first voltage converter (12) is lower than the first supply voltage (13), which is provided by the high-voltage battery (2) for the first voltage converter (12) and the intermediate circuit (6); in the third state, the control device (4) is connected to the intermediate circuit (6) via a first voltage converter (12) and a first diode (9).
3. Control device (1) according to one of the preceding claims, wherein the switching device (8) has a first switch (15) for establishing the first connection (5), wherein the intermediate circuit (6) is switchably connected to the high-voltage battery (2) via the first switch (15).
4. Control device (1) according to one of the preceding claims, wherein the switching device (8) has a second switch (16) for establishing a second connection (7), by means of which the control means (4) is switchably connected to the high-voltage battery (2).
5. The control device (1) according to claim 4, wherein the second switch (16) can only be switched by the control means (4).
6. Control device (1) according to one of the preceding claims 4 and 5, wherein the high voltage battery (2) is connected to the second switch (16) via a second diode (10) such that current can only flow from the high voltage battery (2) to the second switch (16).
7. The control device (1) according to one of the preceding claims, wherein the second switch (16) and the first diode (9) are arranged to control only the connection of the apparatus (4) with the high voltage battery (2) when the second connection (7) is established.
8. Control device (1) according to one of the preceding claims, wherein at least the first connection (5) or the second connection (7) is formed by a mos fet switch.
9. Method for operating a control device (1) according to one of the preceding claims; wherein, starting from a first state of the switching device (8), the method comprises at least the following steps:
a) Determining, by the control device (4), a current state of charge of the high-voltage battery (2); and is also provided with
If the current state of charge is below the limit value
b) A third state is established.
10. The method according to claim 9, wherein the following steps are performed before step b):
i. execute step a) and
if the current state of charge is below the first limit value
Establishing a second state, and
performing step a) and
if the current state of charge is below the second limit value
And iv, executing the step b).
CN202310524072.5A 2022-05-11 2023-05-10 Control device for a high-voltage battery and method for operating a control device Pending CN117048418A (en)

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DE102022204590.4 2022-05-11

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DE4139011A1 (en) 1990-11-27 1992-06-04 Jatco Corp Memory device for automobile engine control microcomputer - has back=up voltage supply for maintaining memory contents upon battery disconnection
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