CN109391001B - Battery pack system and method of cutting at least one of a plurality of branches thereof - Google Patents

Battery pack system and method of cutting at least one of a plurality of branches thereof Download PDF

Info

Publication number
CN109391001B
CN109391001B CN201810884897.7A CN201810884897A CN109391001B CN 109391001 B CN109391001 B CN 109391001B CN 201810884897 A CN201810884897 A CN 201810884897A CN 109391001 B CN109391001 B CN 109391001B
Authority
CN
China
Prior art keywords
branches
battery system
switching
current
branch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201810884897.7A
Other languages
Chinese (zh)
Other versions
CN109391001A (en
Inventor
B.克里格
B.胡贝尔
C.齐瓦诺波洛斯
M.库尔卡
P.鲍克哈格
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of CN109391001A publication Critical patent/CN109391001A/en
Application granted granted Critical
Publication of CN109391001B publication Critical patent/CN109391001B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • H02J7/0031—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
    • H02J7/0026—
    • 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
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells for several batteries or cells simultaneously or sequentially
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Landscapes

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

Abstract

The present invention relates to a battery system and a method of severing at least one of its plurality of branches. A battery system is presented, comprising: -a plurality of branches, wherein the branches each have a plurality of battery cells and wherein the branches are electrically parallel to each other; and-determining means for determining a compensation current between branches electrically parallel to each other, wherein each branch has at least one switching element, wherein the switching elements are configured such that in an open state they electrically separate the respective branch from one or more other branches, wherein the battery system has at least one switching device for switching the respective switching element into the open state, wherein the at least one switching device is configured such that: if the compensation current in the respective branch determined by the determining means is above a limit value, the switching device switches the switching element of the respective branch into the open state.

Description

Battery pack system and method of cutting at least one of a plurality of branches thereof
Technical Field
The present invention relates to a battery system and a method for cutting at least one of a plurality of branches of a battery system.
Background
Battery systems for motor vehicles, static memories or other applications for storing energy contents in the range of, for example, 10kWh to 1MWh are built up from hundreds to thousands of battery cells with corresponding energy contents on the order of a few Wh to a few hundred Wh. To achieve the desired power, the desired energy content, or both, battery cells (e.g., lithium ion cells) are connected in series and parallel with each other.
Internal short circuits may occur in the battery cells. In order to prevent subsequent malfunctions, such as thermal runaway of the battery, which may occur as a result thereof, safety elements are used which deactivate the respective battery cell and electrically connect the external poles or terminals of the battery cell for this purpose.
In battery systems comprising a plurality of parallel branches of series-connected battery cells or series-connected modules, a voltage difference occurs between the branches electrically connected in parallel to each other by disabling individual battery cells or disabling modules of the battery cells by means of a safety element, whereby a compensation current (for example on the order of about 1A to about 100A) is formed. Because there is a current flowing between the branches that are permanently electrically connected to each other within the battery system, the current cannot be interrupted by the main contactors. In adverse situations, this may lead to overload of a single battery cell or of multiple battery cells. In a further disadvantageous situation, this in turn may lead to thermal runaway of the battery. In adverse situations, the compensation current itself may also lead to damage to the battery cells or increased aging.
Disclosure of Invention
THE ADVANTAGES OF THE PRESENT INVENTION
Embodiments of the present invention may be advantageously implemented: preventing compensation current between the branches of the battery system.
According to a first aspect of the present invention, there is provided a battery system including: -a plurality of branches, wherein the branches each have a plurality of battery cells and wherein the branches are electrically parallel to each other; and-determining means for determining a compensation current between branches electrically parallel to each other, wherein each branch has at least one switching element, wherein the switching elements are configured such that in an open state they electrically separate the respective branch from one or more other branches, wherein the battery system has at least one switching device for switching the respective switching element into the open state, wherein the at least one switching device is configured such that: if the compensation current in the respective branch determined by the determining means is higher than a limit value, the switching device switches the switching element of the respective branch into the open state.
The battery pack system has the advantages that: the compensation current is usually reliably prevented or greatly reduced. The branch in which the compensation current flows above the limit value is usually cut off, that is to say the respective branch is electrically separated from one or more other branches or from the poles of the battery system. Thereby, an overload of the battery cells is generally avoided, since the battery cells of the branch are cut off or electrically separated. Thus, thermal runaway of the battery cells and damage or increased aging of the battery cells are generally avoided. The off state may typically be an active state or a passive state of the respective switching element.
The switching elements can each be configured reversibly, i.e. after the switching elements have been activated once, the state of the switching elements can be switched from conductive to nonconductive and vice versa. However, it is also conceivable that: the switching elements are each configured irreversibly, i.e. after they have been activated once they have to be replaced by new switching elements.
The number of branches may be two, three, four, five or more than five (e.g., 10, 20 or 50).
The limit value may be, for example, 5A, 10A, 20A, 50A or 100A.
According to a second aspect of the present invention, a method for switching off at least one of a plurality of branches of a battery system is presented, wherein the branches each have a plurality of battery cells and wherein the branches are electrically parallel to each other, wherein each branch has at least one switching element, wherein the switching elements are configured such that in the off state they electrically separate the respective branch from one or more other branches, wherein the method comprises the steps of: determining a compensation current between the branches; comparing the determined compensation current with a limit value; and switching the switching element, whose compensation current determined in its branch is above said limit value, into said off-state.
The method has the advantages that: the compensation current is usually reliably prevented or greatly reduced. The branch in which the compensation current flows above the limit value is usually cut off, that is to say the respective branch is electrically separated from one or more other branches or from the poles of the battery system. Thereby, an overload of the battery cells is generally avoided, since the battery cells of the branch are cut off or electrically separated. Thus, thermal runaway of the battery cells and damage or increased aging of the battery cells are generally avoided. The off state may typically be an active state or a passive state of the respective switching element.
The inventive concept of embodiments may in particular be regarded as being based on the subsequently described concept and understanding.
According to one embodiment, the switching elements are arranged in a central battery pack disconnection unit, which is separate from the branches. As a result, these switching elements can generally be replaced technically simply, for example after activation and/or after damage. Furthermore, the battery system is generally particularly simple to construct technically. Each switching element can be assigned to exactly one branch, i.e. connected to that branch. Each branch can generally be assigned to exactly one switching element, i.e. connected to the switching element.
According to one embodiment, the switching elements are each part of a branch. Advantageously in this respect, the wiring costs are generally low. Thus, the manufacturing costs of the battery pack system are generally reduced.
According to one embodiment, the battery system is configured such that the determining means determine the compensation current in such a way that a voltage change (dU/dt) of the respective branch with respect to time during a charging process and/or a discharging process of the battery system is determined. In this case, fully utilizing: the voltage generally increases more rapidly during the charging process or decreases more rapidly during the discharging process due to the voltage drop caused by the compensation current on the internal resistance. The compensation current can thus generally be determined technically simply. Typically, this can be achieved, for example, by comparing the voltage change per time unit with a standard value or setting the ratio of the voltage change per time unit to the standard value. Furthermore, it is generally possible to identify individual branches in which compensation currents above a limit value flow and to cut off only the branch or branches.
According to one embodiment, the battery system is configured such that the determining means determine the compensation current by summing the signed current values of the branches and comparing the value of the summed signed current value with a first current limit value in order to determine that no charging and discharging processes of the battery system have occurred; if it has been determined that no charging or discharging process of the battery system has occurred, the absolute values of the current values of these branches are summed for determining the compensation current. In this case, the current can generally be determined individually for each branch, and it can be determined that no charging and discharging processes of the battery system have occurred by comparing the value of the sum of the currents (signed) of each branch with the first current limit value. If it is then determined positively that no charging or discharging of the battery system has taken place, the values of the currents of the branches can generally be summed (the sum being the compensation current) and compared with a second current limit value or said limit value. If no compensation current flows between the branches, the sum of the latter should normally be substantially zero. The compensation current can thus generally be determined technically simply by means of a current measurement.
It is also possible that: the battery system is configured such that the determining means determine the compensation current by-summing the signed current values of the branches and comparing the value of the summed signed current value with a first current limit value in order to determine that no charging and discharging processes of the battery system have occurred; and-if it has been determined that no charging and discharging processes of the battery system have occurred, the current value of the respective branch is taken as the compensation current of the respective branch.
The first current limit value may be, for example, 15A or 30A. The second current limit value may be, for example, +5a or +10a. The first current limit value and/or the second current limit value may be determined or specified in accordance with the measurement accuracy of the battery sensor.
According to one embodiment, the switching device is part of a battery management control unit of the battery system. The advantages are that: no additional components or devices are typically required. Furthermore, the redundancy present in the battery system can generally be exploited for an alternative reaction in the event of a fault (e.g. compensation for the deactivation or disconnection of a branch can be compensated by actuating a switching element in a branch connected in parallel to the branch).
According to one embodiment, each branch comprises its own switching device for activating a switching element which is configured for switching off the respective branch. This has the advantage that the wiring costs are generally low. The switching devices may in each case generally be part of a so-called gateway. Each module or each battery cell may typically have a gateway, respectively. It is possible that typically only one gateway of a branch has a switching device. If each gateway or gateways of a leg has a switching element, these gateways of the leg may typically be logically connected by an or gate (ODER) switching element. The advantages are that: the components that typically participate in cutting off the branch are all in the gateway and therefore the wiring costs are also lower. Through this, an advantage is generally also obtained in terms of robustness, since the possibility of faults caused by the interaction of the components is precluded. The switching elements may generally belong to a branch which can be switched off or deactivated by the respective switching element.
According to one embodiment of the method, the compensation current is determined in that-the signed current values of the branches are summed and the value of the summed signed current value is compared with a first current limit value in order to determine that no charging and discharging processes of the battery system have occurred; -if it has been determined that no charging and discharging processes of the battery system have occurred, the absolute values of the current values of the branches are summed; and-the summed values of the current values of the branches are summed for determining the compensation current. In this case, the current is typically determined individually for each branch, and it is determined that no charging and discharging processes of the battery system have occurred by comparing the value of the sum of the currents (signed) of each branch with the first current limit value. If it is then determined positively that no charging or discharging of the battery system has taken place, the values of the currents of the branches are generally summed and compared with a second current limit value or limit values. If no compensation current flows between the branches, the sum of the latter should normally be substantially zero. Thus, it is generally technically simple to determine the compensation cell by means of a current measurement.
It is also possible that: in the method, a compensation current is determined in that-signed current values of the branches are summed and the value of the summed signed current value is compared with a first current limit value in order to determine that no charging and discharging processes of the battery system have occurred; and-if it has been determined that no charging and discharging processes of the battery system have occurred, the current value of the respective branch is taken as the compensation current of the respective branch.
According to one embodiment of the method, the compensation current is determined by determining the voltage change (dU/dt) of the respective branch with respect to time during the charging process and/or the discharging process of the battery system. In this case, fully utilizing: the voltage generally increases more rapidly during the charging process or decreases more rapidly during the discharging process due to the voltage drop caused by the compensation current on the internal resistance. The compensation current is therefore technically simple to determine. Typically, this can be achieved, for example, by comparing the voltage change per time unit with a standard value or setting the ratio of the voltage change per time unit to the standard value. Furthermore, it is generally possible to identify individual branches in which compensation currents above a limit value flow and to cut off only the branch or branches.
It is pointed out that: some of the possible features and advantages of the present invention are described herein with reference to different embodiments. Those skilled in the art recognize that: these features may be combined, adapted, or interchanged in appropriate ways to obtain other embodiments of the invention.
Drawings
Embodiments of the invention will be described hereinafter with reference to the accompanying drawings, in which neither the drawings nor the description should be designed to limit the invention.
Fig. 1 shows a first embodiment of a battery system according to the present invention;
fig. 2 shows a second embodiment of a battery system according to the present invention; while
Fig. 3 shows a third embodiment of the battery system according to the present invention.
The figures are merely schematic and not to scale. In the drawings, like reference numerals designate like or functionally equivalent features.
Detailed Description
Fig. 1 shows a first embodiment of a battery system 10 according to the present invention. The battery system 10 comprises a plurality of branches 21, 22, 23, said branches 21, 22, 23 being connected electrically in parallel or electrically parallel to each other. Each of the branches 21, 22, 23 includes a plurality of battery cells 35, 36, 37. The battery cells 35, 36, 37 of one branch 21, 22, 23 are connected in series with each other. The battery cells 35, 36, 37 are arranged in the modules 31, 32, 33, that is to say mechanically (fixedly) connected to one another. For example, one leg 21, 22, 23 may comprise about 4-10 modules 31, 32, 33. Each module 31, 32, 33 may comprise, for example, three battery cells 35, 36, 37 or galvanic cells.
Each module 31, 32, 33 is assigned a gateway 40, 41, 42 or a gateway 40, 41, 42 is connected to each module 31, 32, 33 of the modules 31, 32, 33. The gateways 40, 41, 42 are connected to the battery management control unit 60 via a signal bus or signal buses.
Each branch 21, 22, 23 is assigned a switching element 50, 51, 52 or each branch 21, 22, 23 is electrically connected to a switching element 50, 51, 52. The switching elements 50, 51, 52 are arranged in a battery-disconnect-unit (BDU) 55 and are thus arranged separately from the branches 21, 22, 23.
The switching elements 50, 51, 52 are manipulated by the battery management control unit 60 or may be switched into an off state by the battery management control unit 60. Each battery cell 35, 36, 37 has a safety element 45, 46, 47. The safety element 45, 46, 47 shorts the respective battery cell 35, 36, 37 if a fault occurs in the respective battery cell 35, 36, 37. It can be said that the battery cells 35, 36, 37 are deactivated. The respective safety element 45, 46, 47 can then also trigger, that is to say short-circuit, the battery cells 35, 36, 37 in order to prevent subsequent malfunctions due to mechanical deformation of one or more battery cells 35, 36, 37.
As one (or more) battery cell(s) 35, 36, 37 are deactivated, the voltage of the respective branch 21, 22, 23 decreases. Thus, a voltage difference is formed between the different branches 21, 22, 23. This in turn results in a compensating current between the individual branches 21, 22, 23.
The respective branch 21, 22, 23 is switched off (deactivated) by means of the switching element 50, 51, 52, or the respective branch 21, 22, 23 is removed from the circuit or separated from at least one of the poles. If the switching element 50, 51, 52 is switched into the off state, the respective branch 21, 22, 23 is deactivated. The off state may be an active state or a passive state or condition of the respective switching element 50, 51, 52.
Fig. 1 shows three branches 21, 22, 23, each of which branches 21, 22, 23 is assigned a switching element 50, 51, 52.
The battery pack management control unit 60 or a switching device that is part of the battery pack management control unit 60 may switch the switching elements 50, 51, 52 into the off state and thus may cut off the respective branches 21, 22, 23.
The compensation current can be determined in two different ways:
1. the voltage change (dU/dt) of the respective branch 21, 22, 23 with respect to time during the charging process and/or the discharging process of the battery system 10 is determined. The voltage of the battery cells 35, 36, 37 increases during the charging process or decreases during the discharging process due to the voltage drop across the internal resistance. If the compensation current determined by the determining means, which may be part of the battery pack management control unit 60, based on the voltage variation of the respective branch 21, 22, 23 over time is greater than a limit value, the corresponding branch 21, 22, 23 is cut off in such a way that the switching elements 50, 51, 52 belonging to the branch 21, 22, 23 are switched into the off state. The voltage change over time may be compared to a reference value and/or set proportional to the reference value in order to determine the compensation current. The determining means may comprise, for example, one or more circuits or may comprise a computer or may be a computer.
2. The current of each branch 21, 22, 23 is measured. The currents of all branches 21, 22, 23 are added together, including their signs. The sum or the value of the sum is compared with a first current limit value. If the sum is less than the current limit value, then it is positively determined that no charging or discharging process of the battery system 10 is currently occurring. If this has been determined positively, the (absolute) values of the currents of the branches 21, 22, 23 are summed and the sum is compared with a second limit value. In an ideal case (without compensation current, measurement accuracy is infinitely great) the sum should be zero. If the sum is above the second current limit value or limit value, it is determined that a (undesired) compensation current is present and the corresponding branch 21, 22, 23 or all branches 21, 22, 23 are switched off.
For switching off, the switching elements 50, 51, 52 of the respective branch 21, 22, 23 that should be switched off are switched into the off state.
Fig. 2 shows a second embodiment of a battery system 10 according to the present invention. The second embodiment differs from the first embodiment in that:
1. the switching elements 50, 51, 52 are parts of the branches 21, 22, 23, respectively. Each branch 21, 22, 23 comprises at least one switching element 50, 51, 52 for switching off the branch 21, 22, 23.
2. Each branch 21, 22, 23 comprises a switching device for switching the respective switching element 50, 51, 52 into an open state. At least one gateway 40, 41, 42 of each branch 21, 22, 23 comprises a switching device.
Fig. 3 shows a third embodiment of a battery system 10 according to the present invention. The third embodiment differs from the first embodiment in that:
each branch 21, 22, 23 comprises at least one gateway 40, 41, 42, which at least one gateway 40, 41, 42 has a switching device for switching the respective switching element 50, 51, 52 into an open state for deactivating the branch 21, 22, 23. Thus, the switching elements 50, 51, 52 are not part of the branches 21, 22, 23, whereas the switching devices are part of the branches 21, 22, 23, respectively.
In the third embodiment, each branch 21, 22, 23 comprises an or gate (ODER) circuit 70, 71, 72 between the gateway 40, 41, 42 of the branch 21, 22, 23 and the respective switching element 50, 51, 52. If one of the gateways 40, 41, 42 of the branches 21, 22, 23 gives a signal for switching off, there are in total four possibilities for constructing or arranging one or more switching devices and switching elements 50, 51, 52 due to the or gate (ODER) circuits 70, 71, 72:
1. the switching elements 50, 51, 52 are independent of the branches 21, 22, 23; the switching device is independent of the branches 21, 22, 23 (see fig. 1);
2. the switching elements 50, 51, 52 are independent of the branches 21, 22, 23; the switching devices are part of the respective branches 21, 22, 23 (see fig. 3);
3. the switching elements 50, 51, 52 are part of the respective branches 21, 22, 23; the switching device is independent of the branches 21, 22, 23;
4. the switching elements 50, 51, 52 are part of the respective branches 21, 22, 23; the switching devices are part of the respective branches 21, 22, 23 (see fig. 2).
The switching elements 50, 51, 52 may each comprise or may be one or more contactors, one or more semiconductor switches and/or one or more triggerable safety elements (using electrochemical triggering, e.g. high Wen Baoxian wire (pryouse), and/or using thermal triggering, e.g. thermal fuse).
Finally, it is pointed out that: terms like "having," "including," and the like do not exclude other elements or steps and terms like "a" or "an" do not exclude a plurality. Reference signs in the claims shall not be construed as limiting.

Claims (8)

1. A battery pack system (10), comprising:
-a plurality of branches (21, 22, 23), wherein the branches (21, 22, 23) each have a plurality of battery cells (35, 36, 37) and wherein the branches (21, 22, 23) are electrically parallel to each other; and
determining means for determining a compensation current between the branches (21, 22, 23) electrically parallel to each other,
wherein each limb (21, 22, 23) has at least one switching element (50, 51, 52), wherein the switching elements (50, 51, 52) are configured such that the switching elements (50, 51, 52) electrically separate the respective limb (21, 22, 23) from one or more other limbs (21, 22, 23) in the open state,
wherein the battery system (10) has at least one switching device for switching the respective switching element (50, 51, 52) into the off state,
wherein the at least one switching device is configured such that: if the compensation current in the respective branch (21, 22, 23) determined by the determining means is above a limit value, the switching device switches the switching element (50, 51, 52) of the respective branch (21, 22, 23) into the off-state,
wherein the battery system (10) is configured such that the determination means determines the compensation current in such a way that
-summing the signed current values of the branches (21, 22, 23) and comparing the value of the summed signed current values with a first current limit value in order to determine that no charging and discharging processes of the battery system (10) take place;
-if it has been determined that no charging and discharging processes of the battery system (10) have occurred, the absolute values of the current values of the branches (21, 22, 23) are summed for determining the compensation current.
2. The battery system (10) of claim 1, wherein
The switching elements (50, 51, 52) are arranged in a central battery pack disconnection unit separate from the branches (21, 22, 23).
3. The battery system (10) of claim 1, wherein
The switching elements (50, 51, 52) are part of the branches (21, 22, 23), respectively.
4. A battery system (10) according to any of claims 1-3, wherein
The battery system (10) is designed such that the determination device determines the compensation current in such a way that a voltage change (dU/dt) of the respective branch (21, 22, 23) with respect to time during a charging process and/or a discharging process of the battery system (10) is determined.
5. A battery system (10) according to any of claims 1-3, wherein
The switching device is part of a battery management control unit (60) of the battery system (10).
6. A battery system (10) according to any of claims 1-3, wherein
Each branch (21, 22, 23) comprises a switching device of its own for activating the switching element (50, 51, 52), the switching element (50, 51, 52) being configured for switching off the respective branch (21, 22, 23).
7. Method for switching off at least one limb (21, 22, 23) of a plurality of limbs (21, 22, 23) of a battery system (10), wherein the limb (21, 22, 23) has a plurality of battery cells (35, 36, 37) respectively and wherein the limbs (21, 22, 23) are electrically parallel to one another, wherein each limb (21, 22, 23) has at least one switching element (50, 51, 52), wherein the switching elements (50, 51, 52) are configured such that the switching elements (50, 51, 52) electrically separate the respective limb (21, 22, 23) from one or more other limbs (21, 22, 23) in the open state,
wherein the method comprises the steps of:
-determining a compensation current between said branches (21, 22, 23);
comparing the determined compensation current with a limit value; and also
Switching the switching element (50, 51, 52) whose compensation current determined in its branch (21, 22, 23) is above the limit value into the off-state,
wherein the compensation current is determined by
-summing the signed current values of the branches (21, 22, 23) and comparing the value of the summed signed current values with a first current limit value in order to determine that no charging and discharging processes of the battery system (10) take place;
-if it has been determined that no charging and discharging processes of the battery system (10) have occurred, the absolute values of the current values of the branches (21, 22, 23) are summed for determining the compensation current.
8. The method of claim 7, wherein
The compensation current is determined by determining a voltage change (dU/dt) of the respective branch (21, 22, 23) with respect to time during a charging process and/or a discharging process of the battery system (10).
CN201810884897.7A 2017-08-07 2018-08-06 Battery pack system and method of cutting at least one of a plurality of branches thereof Active CN109391001B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017213697.9A DE102017213697A1 (en) 2017-08-07 2017-08-07 Battery system and method for switching off at least one strand of multiple strands of a battery system
DE102017213697.9 2017-08-07

Publications (2)

Publication Number Publication Date
CN109391001A CN109391001A (en) 2019-02-26
CN109391001B true CN109391001B (en) 2023-08-25

Family

ID=65020054

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810884897.7A Active CN109391001B (en) 2017-08-07 2018-08-06 Battery pack system and method of cutting at least one of a plurality of branches thereof

Country Status (3)

Country Link
CN (1) CN109391001B (en)
DE (1) DE102017213697A1 (en)
FR (1) FR3069967B1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102545322A (en) * 2011-12-27 2012-07-04 华为技术有限公司 Battery module, power supply system and battery power supply control method
CN103354377A (en) * 2013-06-26 2013-10-16 安徽力高新能源技术有限公司 Automatic circulation control and protection circuit for lithium battery of energy storage power station
CN103647309A (en) * 2013-11-20 2014-03-19 南京利维斯通自控科技有限公司 Non-circulating-current battery-powered system
CN106953391A (en) * 2017-05-09 2017-07-14 上海电气集团股份有限公司 Battery pack parallel charge-discharge device and charge/discharge control method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5664446B2 (en) * 2011-04-28 2015-02-04 トヨタ自動車株式会社 Battery system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102545322A (en) * 2011-12-27 2012-07-04 华为技术有限公司 Battery module, power supply system and battery power supply control method
CN103354377A (en) * 2013-06-26 2013-10-16 安徽力高新能源技术有限公司 Automatic circulation control and protection circuit for lithium battery of energy storage power station
CN103647309A (en) * 2013-11-20 2014-03-19 南京利维斯通自控科技有限公司 Non-circulating-current battery-powered system
CN106953391A (en) * 2017-05-09 2017-07-14 上海电气集团股份有限公司 Battery pack parallel charge-discharge device and charge/discharge control method

Also Published As

Publication number Publication date
FR3069967A1 (en) 2019-02-08
FR3069967B1 (en) 2021-05-28
CN109391001A (en) 2019-02-26
DE102017213697A1 (en) 2019-02-07

Similar Documents

Publication Publication Date Title
EP3599653B1 (en) Li-ion battery high voltage distribution system architecture
US10326288B2 (en) Method and device for the voltage-controlled self-deactivation of electronic components or battery cells
US9746526B2 (en) Battery cell unit and method for determining a complex impedance of a battery cell arranged in a battery cell unit
KR101616249B1 (en) More readily available traction battery
CN106030951B (en) Battery system and method for operating such a battery system
CN103731121B (en) Fault-tolerant fail-safe connection equipment
KR101634085B1 (en) More readily available traction battery
KR101062101B1 (en) Submarine DC Network with High Power Energy Storage Batteries
US9478996B2 (en) Battery cell unit comprising a battery cell and a monitoring and actuation unit for monitoring the battery cell and method for monitoring a battery cell
US20200266417A1 (en) Protective device, battery, motor vehicle, and method for switching off a battery cell
CN110549967B (en) Motor vehicle electrical system, method for operating same and safety device for same
JP6056581B2 (en) Abnormality detection device for battery pack
US9793578B2 (en) Battery management system having an increased robustness against negative voltages
US6741437B2 (en) Safety device for electrical storage cell battery and battery equipped with the device
US10591551B2 (en) Voltage detection apparatus
CN109391001B (en) Battery pack system and method of cutting at least one of a plurality of branches thereof
US11084382B2 (en) Vehicle energy store
US20230134512A1 (en) Energy storage apparatus
US20220102987A1 (en) Battery control device and short-circuit detection method thereof
DE102021004146A1 (en) Method for operating a high-voltage system and high-voltage system
KR102232394B1 (en) External Short-circuit Testing Apparatus for Battery
US20240131934A1 (en) Control Method for an HV Contactor in a Battery Storage Device and Control Unit for the Implementation Thereof
JP7456352B2 (en) Secondary battery system
US20240266847A1 (en) Module for large scale energy storage
EP4393777A1 (en) Power supply system for vehicle

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant