NL2033225B1 - A battery system and a method of operating thereof - Google Patents

A battery system and a method of operating thereof Download PDF

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Publication number
NL2033225B1
NL2033225B1 NL2033225A NL2033225A NL2033225B1 NL 2033225 B1 NL2033225 B1 NL 2033225B1 NL 2033225 A NL2033225 A NL 2033225A NL 2033225 A NL2033225 A NL 2033225A NL 2033225 B1 NL2033225 B1 NL 2033225B1
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NL
Netherlands
Prior art keywords
management unit
battery management
battery
electrical circuit
energy storage
Prior art date
Application number
NL2033225A
Other languages
Dutch (nl)
Inventor
Seetsen Ward
Original Assignee
Storm Group B V
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Publication date
Application filed by Storm Group B V filed Critical Storm Group B V
Priority to NL2033225A priority Critical patent/NL2033225B1/en
Application granted granted Critical
Publication of NL2033225B1 publication Critical patent/NL2033225B1/en

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Classifications

    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/3644—Constructional arrangements
    • G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
    • 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
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • 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
    • H02J7/00309—Overheat or overtemperature 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

Title: A battery system and a method of operating thereof Abstract A method of operating a battery system comprising an energy storage unit and a battery management unit, wherein the energy storage unit includes at least one battery module having one or more rechargeable battery cells, and wherein the battery management unit is adjustable between a first state, in which the battery management unit is powered by means of the energy storage unit, and a second state, in which the battery management unit is powered off, wherein the battery management unit is configured to perform a check in order to determine whether it is allowed to be turned on based on predefined criteria, and wherein battery management unit is switched to the second state in case the predefined criteria are not met. [+Fig. 3]

Description

P133060NL00
Title: A battery system and a method of operating thereof
FIELD OF THE INVENTION
The invention relates to a method of operating a battery system comprising an energy storage unit and a battery management unit. The invention also relates to a battery system comprising an energy storage unit and a battery management unit. Furthermore, the invention relates to an arrangement comprising the battery system. Also, the invention relates to the use of the battery system.
BACKGROUND TO THE INVENTION
A battery management system (BMS) of a battery system is an electronic system configured to manage a rechargeable battery (cell or battery pack). The BMS may for instance be used for monitoring a state of the battery, performing control actions, balancing of battery cells/modules, monitoring parameters, calculating data, reporting data, etc. The BMS may also be used for example to protect the battery system from operating outside a safe operating area.
The BMS can be connected to a power source in different ways.
In some examples, the BMS is configured to be powered by an external voltage source, such as an external battery. The external battery may be an auxiliary battery in an electrical vehicle for instance.
Alternatively, it is common practice to employ the energy storage unit of the battery system for powering the BMS of the same battery system. Hence, the battery provides voltage to the BMS using an internal voltage source. Although the
BMS may require relative low power to operate, it will continuously consume energy which can be disadvantageous. The power consumption of the BMS may have a significant impact if for example the BMS is turned on for a relatively long period of time.
In some cases, if the battery cells and/or battery modules of the internal energy storage unit of the battery system are depleted too much (cf. undercharged), for example if the state of charge (SoC) is below a predetermined SoC threshold, then damage may occur. This may require great efforts in order to solve the resulting problems. In some examples, lead-acid batteries are used, which may be jump started under certain circumstances when depleted below a threshold.
Moreover, lithium ion battery modules being deep discharged are typically permanently damaged, and cannot be subsequently jump started.
In some cases, the battery system is protected by automatically powering off the BMS when the voltage is below a threshold value. Commonly, this is done in battery systems by using a DC/DC which automatically turns off at a certain voltage. This is not suitable for modular battery systems with varying voltages and this solution only takes into account undervoltage, while overheating for example also might be a reason to turn off the DC/DC.
Furthermore, the battery system in the art may encounter a deadlock situation, in which the battery system can no longer be started up. As a result, the battery may have to be serviced, which can be costly and labor intensive.
There is a strong need to better prevent such detrimental situations, and preferably also reduce the risk of damage to the battery system.
SUMMARY OF THE INVENTION
It is an object of the invention to provide for a method and a system that obviates at least one of the above mentioned drawbacks.
Additionally or alternatively, it is an object of the invention to improve the operation of a battery system.
Additionally or alternatively, it is an object of the invention to reduce the risk of damaging the battery system.
Additionally or alternatively, it is an object of the invention to improve the design of a power source arrangement of the battery management unit of a modular battery system.
Thereto, the invention provides for a method of operating a battery system comprising an energy storage unit and a battery management unit, wherein the energy storage unit includes at least one battery module having one or more rechargeable battery cells, and wherein the battery management unit is adjustable between a first state, in which the battery management unit is powered by means of the energy storage unit, and a second state, in which the battery management unit is powered off, wherein the battery management unit is configured to perform a check in order to determine whether it is allowed to be turned on based on predefined criteria, and wherein battery management unit is switched to the second state in case the predefined criteria are not met.
The battery management unit (cf. BMS) is configured to power itself off when the predefined criteria are not met. In this way, the lifetime of the battery system can be significantly improved by preventing that the battery system is deeply discharged. Moreover, a more efficient design can be obtained. For instance, the battery management unit of the battery system can stop using the internal energy storage of the battery system as a power source when for example said internal energy storage of the battery system is undercharged. As a result, the risk of detrimental effects such as damage to the battery system can be effectively reduced. Furthermore, the battery management unit can still be turned on afterwards, and the battery management unit will reevaluate whether it can remain powered on or whether it has to be powered off based on the predefined criteria.
Optionally, the battery management unit is configured to perform the check in the first state, and wherein the battery management unit is configured to switch to the second state when the criteria to stay on are not met.
Initially, the battery management unit may be momentarily powered on and determine whether it can remain powered or whether it should turn itself off, based on said predefined criteria. This check may be performed for example when the battery system is initially turned on. For instance, when the user tries to (manually) turn on the battery system.
Even if the user repeatedly attempts to start the battery system, still less power may be consumed compared to the situation where the battery management unit remains powered on thereby having a continuous power consumption. Advantageously, normal use cannot lead to damage to the battery cells due to undervoltage/undercharge. 'The battery system has to be repeatedly turned on a large number of times for inducing damage (e.g. larger than 200 times, larger than 500 times, larger than 1000 times, etc). The initial start-up and check of the battery management unit whether it can remain powered on typically uses a relatively small amount of energy.
Optionally, the check is performed at least in response to a start-up or initialization of the battery system.
The check may be performed when the battery system is turned on.
When the battery management unit of the battery system is turned on, the battery management unit may perform a check whether it can remain turned on because the predefined criteria are met, or whether it has to be shut down because predefined criteria are not met. In this way, the operation of the battery system can be improved, and detrimental effects as a result of undercharge of the internal energy storage of the battery system can be effectively prevented.
Optionally, the battery management unit is powered by the energy storage unit via an electrical circuit, wherein, in case the predefined criteria are not met, the battery management unit is configured to switch the electrical circuit to a disabled state in which the battery management unit is not powered.
The check can be performed in order to determine whether the electrical circuit can remain in an enabled state in which the battery management unit is powered. If it follows from the check that the predefined conditions are not met, then the electrical circuit can be switched to a disabled state in which the battery management unit is not powered. With other words, the battery management unit can turn itself off (i.e. power off) by controlling the electrical circuit, depending on the predefined criteria/conditions (e.g. undercharge, error, ete.).
In some examples, the power output of the battery system powers the
BMS through a DC/DC. When an undervoltage has been detected by the BMS, the
BMS may initiate a shutdown of the output of the battery pack, and thereby shut down its own power supply. In some examples, applying an auxiliary voltage to the output of the DC/DC can then be used to jumpstart the battery system.
Optionally, the eleetrical circuit includes an enable port, wherein the electrical circuit is configured to be in an enabled state in which the battery management unit is powered in case an enable signal is received and/or maintained at the enable port.
By providing an enable signal to the enable port, the electrical circuit can remain in an enabled state such that the battery management unit remains turned on. In case the battery management unit determines that it has to be powered off, then the enable signal may no longer be provided/communicated to the electrical circuit. As a result, the battery management unit can automatically be powered off. This provides for a robust and simple design.
The enable port may provide for an ON and OFF logic. For example, a high voltage signal received at the enable port may correspond to ON, and a low 5 voltage may correspond to OFF.
Optionally, the battery management unit comprises a control port, wherein the control port and the enable port are connected by means of a control line, wherein, in case the predefined criteria are met, the battery management unit is configured to provide, by means of the control port using the control line, the enable signal to the enable port of the electrical circuit.
The battery management unit may change the signal at the control port based on the situation in which the predefined criteria are met and the situation in which the predefined criteria are not or no longer met. Hence, by means of the control port, the battery management unit can suitably power itself off or keep itself powered.
Optionally, the battery management unit is configured to not provide the enable signal to the enable port of the electrical circuit in case the predefined criteria are not met.
The electrical circuit may be configured to keep the battery management unit powered on as long as the enable signal is received. Once the enable signal is not received anymore, the electrical circuit may be automatically switched to the disabled state in which the battery management unit is not powered by the energy storage (e.g. cells or modules) of the battery system.
Optionally, the battery management unit is configured to provide a disable signal, different from the enable signal, to the enable port of the electrical circuit in case the predefined criteria are not met, wherein the electrical circuit is configured to stop powering the battery management unit in case said disable signal is received and/or maintained at the enable port.
In this way, a more robust design may be obtained. The electrical circuit may be configured to switch to the disabled state once a disable signal is received.
The risk that the battery management unit is unintentionally powered off can be reduced.
Optionally, in response to the start-up or initialization of the battery system, the electrical circuit is temporarily enabled to power the battery management unit for a time period.
During start-up or initialization of the battery system, an enable signal may be provided to the enable port of the electrical circuit (e.g. DC-DC converter).
As a result, the battery management unit can be powered via the electrical circuit.
The battery management unit will then provide an enable signal to the enable port. of the electrical circuit such that the battery management unit remains powered on. The battery management unit checks whether the predefined criteria are met, and if so, the enable signal can be maintained. If the predefined criteria are not met, the battery management unit operates the electrical circuit via the enable port thereof such that the battery management unit is no longer powered via the electrical circuit.
The “enable” signal which goes through the high pass filter (cf. pulse) may disappear relatively quickly (e.g. less than one second). The battery management unit may be configured to keep the electrical circuit (e.g. DC-DC converter) on for a while until it has checked whether it can stay on or not. This check can take a few seconds for example.
The time period may be chosen such that in the meantime the battery management unit can determine/check whether it has to remain powered, when the predefined conditions are met, or whether it has to be powered off, when the predefined conditions are not or no longer met.
Optionally, the time period is larger or equal to the time for the battery management unit to check whether it can remain powered on, based on the predefined conditions. If the time period is equal to the required time for performing said check, then a more efficient design can be obtained.
In some examples, the time period is smaller than 30 minutes, 20 minutes, 5 minutes, 2 minutes, ete. Various time periods are possible.
Optionally, the time period is smaller than 30 seconds, more preferably smaller than 20 seconds.
By keeping the time period sufficiently small, the detrimental impact on the hardware of the battery system can be reduced.
Optionally, a minimum on-time of at least 1 second is employed, more preferably at least 2 seconds. This may provide sufficient time for the battery management unit to perform the check whether it has to be powered off when the predefined conditions are not or no longer met.
Optionally, keeping the electrical circuit in the enabled state requires input from the battery management unit using the control port connected to the enable port via the control line.
In this way, the enable port can continuously track whether the electrical circuit has to switch from the enabled state to the disabled state, if the enable signal is no longer provided/received.
Optionally, the energy storage unit is electrically coupled to a start-up line, wherein the start-up line is connected to the enable port of the electrical circuit via a filter unit, wherein the filter unit is adapted such that the enable port temporarily receives the enable signal via the start-up line during start-up or initialization of the battery system.
The start-up line may receive a pulse signal as a result of a start-up action. Because of the pulse, the battery management unit may determine that it is allowed to temporarily be powered by the energy storage unit or battery of the battery system.
Optionally, the filter unit is a high pass filter. A DC component of the voltage coming from the energy storage unit may be filtered out. The voltage difference (e.g. OV to 20V) may pass through the filter (cf. pulse). Therefore, an “enable” signal can be provided to the “enable” port of the electrical circuit for a limited period of time, enabling powering of the battery management unit. During said limited period of time, the battery management unit can check whether it can remain powered on or whether it has to turn itself off by communicating to the “enable” port of the electrical circuit.
Advantageously, by employing a high pass filter, the DC-DC can be effectively temporarily enabled during start-up to power the battery management unit (cf. non-constant voltage as a result of start-up). The non-constant voltage passing through the high pass filter can keep the DC-DC enabled for a sufficient period of time. The system is configured such that the DC-DC can keep powering the battery management unit for said period of time which is sufficiently long for the battery management unit to evaluate whether it the DC-DC has to keep powering it or whether the DC-DC has to halt powering the battery management unit (thus powering off the battery management unit). In this way, only during start-up the battery management unit is guaranteed to be powered by the energy storage of the battery system via the DC-DC converter. Subsequently, the battery management unit performs a check, and if the predefined criteria are not met, it is configured to operate the electrical circuit such that no longer power is received, thereby shutting down the battery management unit.
Optionally, the predefined criteria are associated to at least monitored voltages of the one or more rechargeable battery cells of the at least one battery module of the energy storage unit of the battery system.
The predefined criteria may depend on one or more monitored parameters. For example, the cell voltages may be measured by means of a module management unit.
By taking into account the voltages of the cells, it is possible to avoid undervoltage which could be detrimental to the battery system. Damage can be avoided in an effective way, whilst avoiding that the battery management unit continuously drains power from the energy storage of the battery system.
The voltage of each cell in the one or more modules of the battery system can be effectively kept within a predetermine range in order to prevent damage.
It is also envisaged that, additionally or alternatively, the predefined criteria are associated to other parameters, such as data indicative of state of health, state of charge, temperature, ete.
Optionally, the electrical circuit is an electrical converter, preferably a
DC-DC converter.
Optionally, the battery system is a modular battery system comprising a plurality of battery modules each including the at least one rechargeable battery cell.
A modular battery system can provide more flexibility at system level.
Advantageously, according to the invention, a generic auxiliary power DC/DC can be used for different voltages in the modular battery system. This provides additional flexibility for varying voltage ranges in a modular battery system.
Optionally, the predefined criteria take into account whether the battery system is connected to a charger. If some conditions/criteria for instance with regard to voltage are not met, the battery management unit may still remain powered on if the battery is being charged. In this way, it is possible to easily get out of a deadlock situation.
According to an aspect, the invention relates to a battery system comprising an energy storage unit and a battery management unit, wherein the energy storage unit comprises at least one battery module having one or more rechargeable battery cells, and wherein the battery management unit is configured to be adjustable between a first state, in which the battery management unit is powered by means of the energy storage unit, and a second state, in which the battery management unit is powered off, wherein the battery management unit is configured to perform a check in order to determine whether it is allowed to be turned on based on predefined criteria, and wherein battery management unit is configured to switch to the second state in case the predefined criteria are not met.
The BMS may check/verify whether it may be turned on based on one or more received or determined conditions. Further, the BMS can power itself off if said check/verification based on the received/determined conditions shows that it should not be switched on. This may be done by providing no enable signal and/or providing a disable signal. The enable and/or disable signal may be changed based on the check/verification. The operation of the DC-DC converter may depend on at least one of: a received enable signal or disable signal. In some examples, the check/verification is performed at least during start-up of the battery system.
Optionally, during start-up (e.g. manual action by a user), the battery management unit is powered for a limited period of time, wherein said limited period of time is sufficiently long for the battery management unit to check/verity whether the predefined conditions/criteria are met. If the battery management unit determines that the predefined criteria are met, it can keep itself powered. If the battery management unit determines that the predefined criteria are not met, it can power itself off by operating a circuit (e.g. DC-DC converter).
According to an aspect, the invention provides for an electrical system, such as an electric vehicle (EV), comprising a battery system according to the disclosure.
The battery management unit may be configured to detect whether predefined criteria/conditions are met (e.g. based on data indicative of voltage obtained from the different modules of the modular battery system, state of health, temperatures, safety, etc.), so as to determine whether or not it can remain powered on or whether it has to automatically turn itself off again as the predefined criteria/conditions are not met. Damage to the battery system, for instance due to undervoltage, can be effectively prevented in this way.
It will be appreciated that any of the aspects, features and options described in view of the method apply equally to the system and the described arrangement. It will also be clear that any one or more of the above aspects, features and options can be combined.
BRIEF DESCRIPTION OF THE DRAWING
The invention will further be elucidated on the basis of exemplary embodiments which are represented in a drawing. The exemplary embodiments are given by way of non-limitative illustration. It is noted that the figures are only schematic representations of embodiments of the invention that are given by way of non-limiting example.
In the drawing:
Fig. 1 shows a schematic diagram of a method;
Fig. 2 shows a schematic diagram of an embodiment of a system; and
Fig. 3 shows a schematic diagram of an embodiment of a system.
DETAILED DESCRIPTION
Fig. 1 shows a schematic diagram of a method 100 method of operating a battery system. The system includes an energy storage unit and a battery management unit, wherein the energy storage unit includes at least one battery module having one or more rechargeable battery cells. The battery management unit is adjustable between a first state, in which the battery management unit is powered by means of the energy storage unit, and a second state, in which the battery management unit is powered off. In a first step 101, when the battery system is turned on, the battery management unit is powered on and switched to the first state. In a second step 102, the battery management unit is configured to keep itself powered on (i.e. remain in the first state) at least until a check has been performed in order to determine whether the battery management unit is allowed to be turned on based on predefined criteria. In a third step 103, the battery management. unit is configured to adjust its state based on the check. The battery management unit can be configured to perform one or more actions in order to switch to the second state in case the predefined criteria are not met. Alternatively, if the predefined criteria are met, the battery management unit can remain in the first state. In some examples, this may require for example keep providing a signal to an electrical circuit such as to keep powering of the battery management unit enabled.
In some examples, the battery management unit is configured to be powered via an external line. The battery management unit can determine whether it should remain powered on. If it is determined that the predefined criteria are not met (e.g. battery cells with a voltage below a threshold voltage value), the battery management unit may be configured to perform one or more actions so as to power itself off.
Fig. 2 shows a schematic diagram of an embodiment of a system 1 having an energy storage unit 3 and a battery management unit 7, wherein the energy storage unit 3 comprises at least one battery module having one or more rechargeable battery cells. The battery management unit 7 is configured to be adjustable between a first state, in which the battery management unit is powered by means of the energy storage unit 3, and a second state, in which the battery management unit 7 is powered off (i.e. not powered by the energy storage unit 3).
The battery management unit 7 is configured to perform a check in order to determine whether it is allowed to be turned on based on predefined criteria, and wherein battery management unit is configured to switch to the second state in case the predefined criteria are not met.
In the exemplary embodiment shown in fig. 2, an electrical circuit 5 is arranged between the energy storage unit 3 and the battery management unit 7.
The battery management unit 7 is configured to be powered through said electrical circuit 5. For example, the electrical circuit 5 may be a DC-DC converter. In some examples, the electrical circuit 5 is configured to change its operation based on an enable port 9. During start-up or initialization, the enable port may receive an enable signal through a first line 11. Subsequently, the electrical circuit 5 is enabled, and the battery management unit 7 is powered via said electrical circuit 5 connected to the energy storage unit 3. The battery management unit 7 can then guarantee that an enable signal is provided to the enable port 9 via line 13 at least until the check is performed whether predefined criteria are met. If these predefined criteria are met, the electrical circuit 5 can be kept enabled. However, if the predefined criteria are not met, the electrical circuit 5 can be disabled by providing a suitable signal to the enable port. For instance, the electrical circuit 5 may be disabled (and thus the battery management unit 7 is no longer powered by the energy storage unit 3) if no longer an enable signal is received at the enable port. Additionally or alternatively, the electrical circuit 5 may be disabled when a disable signal is received. It is also envisaged that alternative subsystems are used instead of the enable port. For example, a controller may be used which may be configured to communicate with other units of the battery system. For example, the battery management unit may instruct the controller to stop providing power in case the predefined criteria are not met.
The first line 11 may be configured to temporarily provide an enable signal to the electrical circuit. As a result the battery management unit will be powered and provide an enable signal to the electrical circuit. Then, when the first line 11 no longer provides the enable signal, the battery management unit 7 may remain powered on at least until it has checked whether the predefined criteria are met. It will be appreciated that the first line 11 may still be connected to the power source although no longer providing the enable signal. This may for instance be achieved by employing a filter, which is configured to temporarily output an enable signal.
Fig. 3 shows a schematic diagram of an embodiment of a system 1. The battery management unit 7 is adjustable between a first state, in which the battery management unit is powered by means of the energy storage unit 3, and a second state, in which the battery management unit is powered off (i.e. not powered by the energy storage unit 3). The battery management unit 7 is configured to perform a check in order to determine whether it is allowed to be turned on based on predefined criteria. The battery management unit is switched to the second state in case the predefined criteria are not met.
In this example, the check is performed at least in response to a start- up or initialization of the battery system 1. The battery management unit 7 is powered by the energy storage unit 3 via an electrical circuit 5, wherein, in case the predefined criteria are not met, the battery management unit is configured to switch the electrical circuit 5 to a disabled state in which the battery management unit 7 is not powered. Furthermore, in this example, the electrical circuit 5 includes an enable port, wherein the electrical circuit is configured to be in an enabled state in which the battery management unit is powered in case an enable signal is received and/or maintained at the enable port.
The battery management unit 7 comprises a control port 15, wherein the control port 15 and the enable port 9 are connected by means of a control line 18’. In case the predefined criteria are met, the battery management unit 7 is configured to provide, by means of the control port 15 using/through the control line 13’, the enable signal to the enable port 9 of the electrical circuit 5.
In some examples, the battery management unit 7 is configured to not provide the enable signal to the enable port 9 of the electrical circuit 5 in case the predefined criteria are not met. In some examples, the battery management unit 7 may be configured to provide a disable signal, different from the enable signal, to the enable port of the electrical circuit in case the predefined criteria are not met, wherein the electrical circuit is configured to stop powering the battery management unit in case said disable signal is received and/or maintained at the enable port. The disable signal may for instance be OV (or low signal).
In some examples, keeping the electrical circuit in the enabled state (for example after the check has been performed) requires input from the battery management unit 7 using the control port 15 connected to the enable port 9 via the control line 18’.
In this example, B+ of the energy storage unit 3 is electrically coupled to a start-up line 11, wherein the start-up line 11’ is connected to the enable port 9 of the electrical circuit 5 via a filter unit 21. The filter unit 21 may be adapted such that the enable port 9 temporarily receives the enable signal via the start-up line
IT’ during start-up or initialization of the battery system.
The DC-DC converter 5 may be initially enabled to power on the battery management unit 7 as a result of the enable signal coming from the high pass filter during start-up. Once the battery management unit is powered, it can keep the DC-
DC converter powered at least until it has checked whether the predefined criteria are met. If said predefined criteria are met, it can suitable operate the DC-DC converter via the enable port such that the battery management unit remains to get powered via the electrical circuit (ef. battery management unit maintains enable signal at the enable port). If said predefined criteria are not met, it can suitable operate the DC-DC converter via the enable port such that the battery management unit is no longer powered via the electrical circuit (cf. battery management unit no longer maintains enable signal at the enable port).
When a start-up is initiated, the battery management unit 7 is turned on and subsequently checks whether it can remain operational based on the predefined criteria. If the predefined criteria are not met, it can shut itself down by operating the signal on the control port 15 of the battery management unit. In this way, the DC/DC converter can stop providing voltage to the battery management unit. Therefore, a continuous power consumption of the battery management unit can be avoided when the predefined criteria are not met.
Advantageously, the battery management unit 7 can control its own power in an effective way. There can be a temporary power enable on start-up. By connecting the start-up line 11’ (ef. first line 11), the electrical circuit (e.g. DC/DC converter) is temporarily enabled to power the battery management unit 7. When said start-up line 11° is connected for more than a predetermined timeframe, it does not provide the enable anymore to the electrical circuit. The battery management unit 7 has to provide this enable from that point on. If the battery management unit 7 stops providing the enable (e.g. in case of a fault, an undervoltage, overheating at one or more locations in the battery system, ete), the electrical circuit shuts down, even if the start-up line IT is still connected.
In some examples, the predefined criteria are associated to at least monitored voltages of the one or more rechargeable battery cells of the at least one battery module of the energy storage unit of the battery system. In this way, detrimental effects such as hardware damage due to undervoltage can be effectively prevented. The predefined criteria may take into account whether the battery system is connected to a charger. If some conditions/eriteria for instance with regard to voltage are not met, the battery management unit may still remain powered on if the battery is being charged. In this way, it is possible to easily get out of a deadlock situation.
It will be appreciated that in the event of an operational irregularity or error, the battery management unit may still remain powered on in some situations.
It will be appreciated that the method may include computer implemented steps. All above mentioned steps can be computer implemented steps.
Embodiments may comprise computer apparatus, wherein processes performed in computer apparatus. The invention also extends to computer programs, particularly computer programs on or in a carrier, adapted for putting the invention into practice. The program may be in the form of source or object code or in any other form suitable for use in the implementation of the processes according to the invention. The carrier may be any entity or device capable of carrying the program. For example, the carrier may comprise a storage medium, such as a
ROM, for example a semiconductor ROM or hard disk. Further, the carrier may be a transmissible carrier such as an electrical or optical signal which may be conveyed via electrical or optical cable or by radio or other means, e.g. via the internet or cloud.
Some embodiments may be implemented, for example, using a machine or tangible computer-readable medium or article which may store an instruction or a set of instructions that, if executed by a machine, may cause the machine to perform a method and/or operations in accordance with the embodiments.
Various embodiments may be implemented using hardware elements, software elements, or a combination of both. Examples of hardware elements may include processors, microprocessors, circuits, application specific integrated circuits (ASIC), programmable logic devices (PLD), digital signal processors (DSP), field programmable gate array (FPGA), logic gates, registers, semiconductor device, microchips, chip sets, et cetera. Examples of software may include software components, programs, applications, computer programs, application programs, system programs, machine programs, operating system software, mobile apps, middleware, firmware, software modules, routines, subroutines, functions, computer implemented methods, procedures, software interfaces, application program interfaces (API), methods, instruction sets, computing code, computer code, et cetera.
Herein, the invention is described with reference to specific examples of embodiments of the invention. It will, however, be evident that various modifications, variations, alternatives and changes may be made therein, without departing from the essence of the invention. For the purpose of clarity and a concise description features are described herein as part of the same or separate embodiments, however, alternative embodiments having combinations of all or some of the features described in these separate embodiments are also envisaged and understood to fall within the framework of the invention as outlined by the claims. The specifications, figures and examples are, accordingly, to be regarded in an illustrative sense rather than in a restrictive sense. The invention is intended to embrace all alternatives, modifications and variations which fall within the scope of the appended claims. Further, many of the elements that are described are functional entities that may be implemented as discrete or distributed components or in conjunction with other components, in any suitable combination and location.
In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word ‘comprising’ does not exclude the presence of other features or steps than those listed in a claim. Furthermore, the words ‘a’ and ‘an’ shall not be construed as limited to ‘only one’, but instead are used to mean ‘at least one’, and do not exclude a plurality. The term "and/or" includes any and all combinations of one or more of the associated listed items. The mere fact that certain measures are recited in mutually different claims does not indicate that a combination of these measures cannot be used to an advantage.

Claims (14)

ConclusiesConclusions 1. Werkwijze voor het bedienen van een batterijsysteem omvattende een energieopslag en een batterijmanagementeenheid, waarbij de energieopslag ten minste een batterijmodule met een of meer herlaadbare batterijcellen omvat, en waarbij de batterijmanagementeenheid verstelbaar is tussen een eerste toestand, waarin de batterijmanagementeenheid door middel van de energieopslag bekrachtigd wordt, en een tweede toestand, waarin de batterijmanagementeenheid uitgeschakeld is, waarbij de batterijmanagementeenheid geconfigureerd is om een check uit te voeren om op basis van vooraf bepaalde criteria te bepalen of het toelaatbaar is om ingeschakeld te worden, en waarbij de batterijmanagementeenheid naar de tweede toestand geschakeld wordt indien de vooraf bepaalde criteria niet voldaan zijn.1. Method for operating a battery system comprising an energy storage and a battery management unit, wherein the energy storage comprises at least a battery module with one or more rechargeable battery cells, and wherein the battery management unit is adjustable between a first state in which the battery management unit is operated by means of the energy storage is energized, and a second state, wherein the battery management unit is turned off, wherein the battery management unit is configured to perform a check to determine whether it is permissible to be turned on based on predetermined criteria, and wherein the battery management unit is sent to the second state is switched if the predetermined criteria are not met. 2. Werkwijze volgens conclusie 1, waarbij de check ten minste in reactie op een opstart of initialisatie van het batterijsysteem uitgevoerd wordt.Method according to claim 1, wherein the check is carried out at least in response to a start-up or initialization of the battery system. 3. Werkwijze volgens conclusie 1 of 2, waarbij de batterijmanagementeenheid via een elektrisch circuit door de energieopslag bekrachtigd wordt, waarbij, indien de vooraf bepaalde criteria niet voldaan zijn, de batterijmanagementeenheid geconfigureerd is om het elektrische circuit naar een uitgeschakelde toestand te schakelen waarin de batterijmanagementeenheid niet bekrachtigd wordt.A method according to claim 1 or 2, wherein the battery management unit is powered by the energy storage via an electrical circuit, wherein, if the predetermined criteria are not met, the battery management unit is configured to switch the electrical circuit to a disabled state in which the battery management unit is not ratified. 4. Werkwijze volgens conclusie 3, waarbij het elektrische circuit een enable- poort omvat, waarbij het elektrische circuit geconfigureerd is om in een vrijgegeven toestand te zijn waarin de batterijmanagementeenheid bekrachtigd wordt, indien een enable-signaal aan de enable-poort ontvangen en/of in stand is.The method of claim 3, wherein the electrical circuit includes an enable port, the electrical circuit being configured to be in an enabled state in which the battery management unit is energized when an enable signal is received at the enable port and/or is maintained. 5. Werkwijze volgens conclusie 4, waarbij de batterijmanagementeenheid een regelpoort omvat, waarbij de regelpoort en de enable-poort door middel van een regellijn verbonden zijn, waarbij, indien aan de vooraf bepaalde criteria voldaan zijn, de batterijmanagementeenheid geconfigureerd is om, via de regelpoort, het enable-signaal door middel van de regellijn te verschaffen aan de enable-poort van het elektrische circuit.A method according to claim 4, wherein the battery management unit comprises a control port, wherein the control port and the enable port are connected by a control line, wherein, if the predetermined criteria are met, the battery management unit is configured to, via the control port , to provide the enable signal through the control line to the enable port of the electrical circuit. 6. Werkwijze volgens conclusie 4 of 5, waarbij de batterijmanagementeenheid geconfigureerd is om het enable-signaal niet aan de enable-poort van het elektrische circuit te verschaffen indien niet aan de vooraf bepaalde criteria voldaan is.A method according to claim 4 or 5, wherein the battery management unit is configured not to provide the enable signal to the enable port of the electrical circuit if the predetermined criteria are not met. 7. Werkwijze volgens een der voorgaande conclusies 4-6, waarbij de batterijmanagementeenheid geconfigureerd is om aan de enable-poort van het elektrische circuit een disable-signaal te verschaffen, dat verschilt van het enable- signaal, indien niet aan de vooraf bepaalde criteria voldaan is, waarbij het elektrische circuit geconfigureerd is om het bekrachtigen van de batterijmanagementeenheid te stoppen indien genoemd disable-signaal bij de disable-poort ontvangen en/of in stand is.7. Method according to any of the preceding claims 4-6, wherein the battery management unit is configured to provide a disable signal to the enable port of the electrical circuit, which is different from the enable signal, if the predetermined criteria are not met wherein the electrical circuit is configured to stop energizing the battery management unit if said disable signal is received and/or maintained at the disable port. 8. Werkwijze volgens een der voorgaande conclusies 2-7, waarbij, als reactie op de opstart of initialisatie van het batterijsysteem, het elektrische circuit tijdelijk vrijgegeven wordt om de batterijmanagementeenheid voor een tijdsperiode te bekrachtigen.A method according to any one of the preceding claims 2-7, wherein, in response to the start-up or initialization of the battery system, the electrical circuit is temporarily released to energize the battery management unit for a period of time. 9. Werkwijze volgens conclusie 8 voor zover ook athankelijk van conclusie 4, waarbij het in de vrijgegeven toestand houden van het elektrische circuit input van de batterijmanagementeenheid vereist met behulp van de regelpoort die met de enable-poort via de regellijn verbonden is.A method according to claim 8 when also dependent on claim 4, wherein maintaining the electrical circuit in the released state requires input from the battery management unit using the control port connected to the enable port via the control line. 10. Werkwijze volgens conclusie 8, waarbij de energieopslag elektrisch aan een opstartlijn gekoppeld is, waarbij de opstartlijn met de enable-poort van het elektrische circuit verbonden is via een filtereenheid, waarbij de filtereenheid zodanig is ingericht dat de enable-poort tijdelijk gedurende de opstart of initialisatie van het batterijsysteem via de opstartlijn het enable-signaal ontvangt.10. Method according to claim 8, wherein the energy storage is electrically coupled to a start-up line, wherein the start-up line is connected to the enable port of the electrical circuit via a filter unit, wherein the filter unit is arranged in such a way that the enable port is temporarily closed during start-up. whether initialization of the battery system receives the enable signal via the boot line. 11. Werkwijze volgens een der voorgaande conclusies, waarbij de vooraf bepaalde criteria geassocieerd zijn met ten minste gemonitorde spanningen van de een of meer herlaadbare batterijcellen van de ten minste ene batterijmodule van de energieopslag van het batterijsysteem.Method according to any one of the preceding claims, wherein the predetermined criteria are associated with at least monitored voltages of the one or more rechargeable battery cells of the at least one battery module of the energy storage of the battery system. 12. Werkwijze volgens een der voorgaande conclusies, waarbij het elektrische circuit een elektrische convertor is, bij voorkeur een DC-DC convertor.Method according to any one of the preceding claims, wherein the electrical circuit is an electrical converter, preferably a DC-DC converter. 13. Werkwijze volgens een der voorgaande conclusies, waarbij het batterijsysteem een modulair batterijsysteem is omvattende een veelheid van batterijmodules elk omvattende de ten minste ene herlaadbare batterijcel.Method according to any one of the preceding claims, wherein the battery system is a modular battery system comprising a plurality of battery modules, each comprising the at least one rechargeable battery cell. 14. Batterijsysteem omvattend een energieopslag en een batterijmanagementeenheid, waarbij de energieopslag ten minste een batterijmodule omvat met een of meer herlaadbare batterijcellen, en waarbij de batterijmanagementeenheid geconfigureerd is om verstelbaar te zijn tussen een eerste toestand, waarin de batterijmanagementeenheid via de energieopslag bekrachtigd wordt, en een tweede toestand, waarin de batterijmanagementeenheid uitgeschakeld is, waarbij de batterijmanagementeenheid geconfigureerd is om een check uit te voeren om op basis van vooraf bepaalde criteria te bepalen of het toelaatbaar is om te worden ingeschakeld, en waarbij de batterijmanagementeenheid geconfigureerd is om naar de tweede toestand geschakeld te worden indien de vooraf bepaalde criteria niet voldaan zijn.14. Battery system comprising an energy storage and a battery management unit, wherein the energy storage comprises at least a battery module with one or more rechargeable battery cells, and wherein the battery management unit is configured to be adjustable between a first state in which the battery management unit is powered via the energy storage, and a second state in which the battery management unit is turned off, wherein the battery management unit is configured to perform a check to determine whether it is permissible to be turned on based on predetermined criteria, and wherein the battery management unit is configured to enter the second state be switched if the predetermined criteria are not met.
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Citations (2)

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US20130009466A1 (en) * 2011-07-08 2013-01-10 Sony Engergy Devices Corporation Control device, electric storage system, electronic device, electric vehicle, and electric power system
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Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130009466A1 (en) * 2011-07-08 2013-01-10 Sony Engergy Devices Corporation Control device, electric storage system, electronic device, electric vehicle, and electric power system
US20180042095A1 (en) * 2016-08-03 2018-02-08 Samsung Electronics Co., Ltd. Mobile x-ray apparatus

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