EP2684272A1 - Dispositif accumulateur servant à accumuler de l'énergie électrique et procédé permettant de faire fonctionner un dispositif accumulateur - Google Patents

Dispositif accumulateur servant à accumuler de l'énergie électrique et procédé permettant de faire fonctionner un dispositif accumulateur

Info

Publication number
EP2684272A1
EP2684272A1 EP12703055.9A EP12703055A EP2684272A1 EP 2684272 A1 EP2684272 A1 EP 2684272A1 EP 12703055 A EP12703055 A EP 12703055A EP 2684272 A1 EP2684272 A1 EP 2684272A1
Authority
EP
European Patent Office
Prior art keywords
switching element
memory cell
charging current
storage device
memory
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.)
Withdrawn
Application number
EP12703055.9A
Other languages
German (de)
English (en)
Inventor
Alexander Osswald
Thomas Heinrich
Rainer Glauning
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 EP2684272A1 publication Critical patent/EP2684272A1/fr
Withdrawn legal-status Critical Current

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
    • 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
    • H02J7/00302—Overcharge protection

Definitions

  • a storage device for storing electrical energy and method for operating a storage device
  • the invention relates to a storage device for storing electrical energy.
  • the invention further relates to a method for operating a storage device for storing electrical energy.
  • the memory cell In order to avoid damage to memory cells of a rechargeable battery, the memory cell must not be overloaded. It is known that a charger can be timely, i. before an overcharge of the memory cell, a charging process stops and a corresponding charging current turns off.
  • a disadvantage of this is in particular that in the case of a defect in the charger this may not switch off the charging current in time, so that the memory cell can be overloaded, which possibly leads to damage to the memory cell.
  • the object underlying the invention can therefore be seen to provide a memory device for storing electrical energy, wherein overcharging is effectively prevented even in a defective charger.
  • a storage device for storing electrical energy is provided.
  • the storage device is preferably formed as a rechargeable battery.
  • a battery can also be referred to as a battery pack.
  • the rechargeable battery may be in the form of a lead-acid battery, a lithium ion rechargeable battery, a lithium polymer rechargeable battery, a lithium iron phosphate rechargeable battery, a lithium titanate rechargeable battery, a lithium sulfur rechargeable battery, a sodium nickel rechargeable battery.
  • Chloride accumulator a sodium-sulfur accumulator, a nickel-iron accumulator, a nickel-cadmium accumulator, a nickel-metal hydride accumulator, a nickel-hydrogen accumulator, a nickel-zinc accumulator or as a tin-nickel accumulator.
  • Sulfur lithium accumulator be formed.
  • the memory device further comprises a memory cell, which can be charged by means of an electrical charging current.
  • the memory cell is preferably a galvanic cell. In the context of accumulators, such a galvanic cell may also be referred to as a secondary cell.
  • the memory device has a monitoring device which can monitor a physical quantity in the memory cell.
  • the physical variable is preferably a temperature in the memory cell and / or an electrical voltage in the memory cell. Such a temperature may also be referred to as a storage cell temperature. Such a voltage may also be referred to as a memory cell voltage.
  • a switching element for interrupting the charging current is formed, wherein the switching element is controllable by means of the monitoring device.
  • This control happens in particular depending on the monitored size. This means, for example, that when the memory cell temperature rises and / or the memory cell voltage rises above a predetermined voltage value or temperature value, the monitoring device sends a control signal to the switching element, so that the latter interrupts the charging current.
  • a switching element in the sense of the present invention has two switching states: an open switching state in which a charging circuit is interrupted, so that no electrical charging current for charging the memory cell can flow, and a closed switching state in which the charging circuit is closed, so that an electric Charging current for charging the memory cell can flow.
  • the switching element When the switching element is in the open switching state, the switching element may also be referred to as an open switching element.
  • the switching element When the switching element is in the closed switching state, the switching element may also be referred to as a closed switching element.
  • the memory device comprises a discharging means for discharging the memory cell when the charging current is interrupted.
  • a discharging means for discharging the memory cell when the charging current is interrupted.
  • the discharge means is formed such that the memory cell is discharged when the charging current is interrupted by the switching element.
  • a plurality of discharge means can also be provided.
  • a method for operating a storage device for storing electrical energy comprising a memory cell.
  • the memory cell is charged by means of an electrical charging current, wherein a physical quantity in the memory cell is monitored during the charging process.
  • the electrical charging current is interrupted depending on the monitored variable, wherein after the interruption of the charging current, the memory cell is at least partially discharged.
  • the memory cell can be completely discharged.
  • the invention includes the idea that during a charging process of a memory cell, a physical quantity in the memory cell is monitored. This physical variable is dependent, in particular, on a state of charge of the memory cell. If this physical quantity increases above a predetermined value, this predetermined value corresponding in particular to a maximum charge state of the memory cell, the charging current is interrupted so that further charging of the memory cell is advantageously effectively prevented. In this respect, an overcharge of the memory cell can be prevented or, if the memory cell has already been overcharged, a further overcharge can be prevented. In that, after the charging current has been interrupted, the memory cell is at least partially discharged, the charge or overcharge in the memory cell is degraded. Thus, advantageously, damage due to an overcharge state of the memory cell is effectively avoided. Preferably, the memory cell is discharged until the physical quantity is below a predetermined value.
  • the switching element is a reversible switching element.
  • Reversible means in particular that the switching element between the open switching state and the closed switching state can be switched back and forth.
  • the memory cell can be further charged or recharged when the physical size again corresponds to an allowable value, since the reversible switching element can close the charging circuit again.
  • the switching element is a transistor, in particular a field effect transistor, preferably a self-conducting field effect transistor or a relay.
  • the discharge means comprises a diode, preferably a Zener diode, a Schottky diode or a suppressor diode, which is connected in parallel with the switching element.
  • the diode is connected in the reverse direction with respect to a charging current direction so that the diode does not allow the charging current to pass. It acts insofar as an insulator.
  • the charging current can only flow insofar through the closed switching element, which is closed for a charging process. Only when the switching element is opened, so that the charging current is interrupted, a discharge current can flow from the memory cells via the diode.
  • the diode thus bridges the switch element. It can be provided in particular that, after the memory cell has been at least partially, preferably completely, discharged, the switching element closes the charging circuit again and thus in turn bridges the diode.
  • a plurality of diodes may also be provided.
  • the discharging means comprises a further switching element and one or more electrical resistors, which are connected in parallel with the memory cell. A discharge of the memory cell can therefore take place on the Wderstand or Wdernot.
  • the further switching element may be formed analogously to the switching element.
  • the further switching element is controllable by means of the monitoring device.
  • the monitoring device can therefore first actuate the switching element, so that the charging circuit is interrupted. After a predetermined time, it then actuates the further switching element, so that the electrical resistance or the electrical resistances is or are switched parallel to the memory cell. After the at least partial discharge, the further switching element opens, so that it is no longer possible to discharge the memory cell via the heat resistor.
  • a plurality of memory cells are formed.
  • the memory cells can be connected in particular in series or connected in parallel to increase a total capacitance of the memory cells.
  • some memory cells are connected in parallel and some memory cells are connected in series, wherein the memory cells connected in parallel to the series-connected memory cells are in turn connected in parallel or in series.
  • it is sufficient for a plurality of memory cells that a physical quantity in a memory cell is above a predetermined value in order to interrupt the charging process.
  • 1 shows a storage device for storing electrical energy
  • Fig. 3 shows a further memory device for storing electrical energy
  • FIG. 4 shows another storage device for storing electrical energy.
  • Fig. 1 shows a storage device 101 for storing electrical energy.
  • the memory device 101 comprises a memory cell 103, which can be charged by means of an electrical charging current.
  • a monitoring device 105 monitors a physical quantity in the memory cell 103.
  • the physical variable may be, for example, a memory cell temperature and / or a memory cell voltage.
  • the monitoring device 105 controls a switching element 107, which can interrupt the electric charging current, wherein the control is performed depending on the monitored physical quantity.
  • a discharge means 109 is provided, which, when the switching element 107 interrupts the charging current, at least partially discharges the storage cell 103, in particular completely discharges it.
  • the discharge means 109 is controllable by means of the monitoring device 105.
  • FIG. 2 shows a flow diagram of a method for operating a storage device for storing electrical energy, the storage device having a storage cell.
  • the memory cell is charged by means of an electrical charging current, wherein a physical quantity in the memory cell is monitored during the charging process.
  • the charging electric current is interrupted depending on the monitored quantity, in particular, when the monitored quantity is larger than a predetermined value.
  • the memory cell is at least partially discharged. In particular, the memory cell is completely discharged.
  • the memory cell is discharged until the physical quantity is below a predetermined value. Subsequently, it can be provided that the memory cell is automatically charged again.
  • 3 shows a further storage device 301 for storing electrical energy.
  • the memory device 301 includes a plurality of memory cells 303 connected in series. A respective physical quantity in the memory cells 303 is monitored by means of a monitoring device 305. Depending on the monitored quantity, the monitoring device 305 controls a switching element 307 such that it interrupts a charging circuit 311 comprising two contacts 311 a and 31 1 b so that no charging current can flow to the memory cells 303 any more.
  • the switching element 307 is connected in series with the charging circuit 311 and with the memory cells 303 between the charging contact 311 a and the memory cells 303.
  • a discharge means 309 is connected in the form of a diode, wherein the diode 309 is connected in the direction of the charging current in the reverse direction. That is, as long as the switching element 307 closes the charging circuit 311, only one charging current can flow through the switching element 307 to the memory cells 303, but not through the diode 309, which acts as an insulator in the charging current direction.
  • the switching element 307 interrupts the charging circuit 31 1 1
  • an electric discharge current flows from the memory cells 303 via the diode 309 to the contact 311 a, so that the memory cells 303 are discharged.
  • the contact 311 a may also be referred to as a charge / discharge contact.
  • the contact 31 1 b is preferably a ground contact.
  • the switching element 307 is controlled by the monitoring device 305 in such a way that the switching element 307 closes the charging circuit 31 1 again.
  • the memory cells 303 can be recharged so far. If, for example, the memory device 301 is still contacted with a charger which can not automatically switch off a charging current, the switching element 307 will again open the charging circuit 31 1 if, during the charging process, the respective physical variable in the memory cells 303 exceeds a permissible value Value increases.
  • FIG. 4 shows another storage device 401 for storing electrical energy.
  • the memory device 401 has no diode which is parallel to the switching element 307 is switched.
  • a resistor 403 and a further switching element 405 are provided here, which are both connected in series with one another, these two elements then being connected in parallel with the memory cells 303.
  • the further switching element 405 is controlled by means of the monitoring device 305.
  • resistors which are connected to each other in series or in parallel, in particular, it may be provided that some resistors in series and other resistors are connected in parallel to each other.
  • the switching element 307 has interrupted the charging circuit 31 1
  • the further switching element 405 closes, so that the Wderstand 403 is connected in parallel to the other memory cells 303, so that over the Wderstand 403, the memory cells 303 can discharge.
  • the monitoring device 305 detects that the respective physical quantity in the memory cells 303 has dropped below a predetermined value, it opens the further one
  • the other switch element 405 closes the switching element 307 so that the memory cells 303 can be recharged.
  • Switching element 405 and the resistor 403 also be a diode connected in parallel to the switching element 307 analogous to the memory device 301 in Fig. 3.
  • the invention advantageously prevents memory cells from being damaged due to overcharge, this being independent of a charger becomes. This means, in particular, that even a charger that can not automatically switch off the charging current due to a defect or has no such automatic switch-off at all, can not overload the memory cells in such a way that they are permanently damaged. A related redundant design of the charger with respect to a shutdown is therefore no longer necessary.

Abstract

L'invention concerne un dispositif accumulateur (101) servant à accumuler de l'énergie électrique, comprenant un élément accumulateur (103) rechargeable au moyen d'un courant de charge électrique et un dispositif de surveillance (105) servant à surveiller une grandeur physique dans l'élément accumulateur (103), un élément de commande (107) pouvant être commandé au moyen du dispositif de surveillance (105) en fonction de la grandeur physique surveillée servant à couper le courant de charge. Ce dispositif accumulateur est caractérisé en ce qu'un moyen de décharge (109) sert à décharger l'élément accumulateur (103) en cas de coupure du courant de charge. L'invention concerne également un procédé permettant de faire fonctionner un dispositif accumulateur (101) servant à accumuler de l'énergie électrique, équipé d'un élément accumulateur (103).
EP12703055.9A 2011-03-11 2012-02-01 Dispositif accumulateur servant à accumuler de l'énergie électrique et procédé permettant de faire fonctionner un dispositif accumulateur Withdrawn EP2684272A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011005421A DE102011005421A1 (de) 2011-03-11 2011-03-11 Speichervorrichtung zum Speichern von elektrischer Energie und Verfahren zum Betreiben einer Speichervorrichtung
PCT/EP2012/051668 WO2012123179A1 (fr) 2011-03-11 2012-02-01 Dispositif accumulateur servant à accumuler de l'énergie électrique et procédé permettant de faire fonctionner un dispositif accumulateur

Publications (1)

Publication Number Publication Date
EP2684272A1 true EP2684272A1 (fr) 2014-01-15

Family

ID=45569616

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12703055.9A Withdrawn EP2684272A1 (fr) 2011-03-11 2012-02-01 Dispositif accumulateur servant à accumuler de l'énergie électrique et procédé permettant de faire fonctionner un dispositif accumulateur

Country Status (3)

Country Link
EP (1) EP2684272A1 (fr)
DE (1) DE102011005421A1 (fr)
WO (1) WO2012123179A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1096637A1 (fr) * 1999-03-16 2001-05-02 Matsushita Electric Industrial Co., Ltd. Circuit de commande de batterie rechargeable
KR20100090198A (ko) * 2009-02-05 2010-08-13 삼성에스디아이 주식회사 배터리 팩의 보호 회로 및 이를 구비하는 배터리 팩

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101076953B1 (ko) * 2003-10-27 2011-10-26 소니 주식회사 전지팩

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1096637A1 (fr) * 1999-03-16 2001-05-02 Matsushita Electric Industrial Co., Ltd. Circuit de commande de batterie rechargeable
KR20100090198A (ko) * 2009-02-05 2010-08-13 삼성에스디아이 주식회사 배터리 팩의 보호 회로 및 이를 구비하는 배터리 팩
EP2296249A2 (fr) * 2009-02-05 2011-03-16 Samsung SDI Co., Ltd. Circuit de protection pour bloc-batterie et bloc-batterie le comprenant

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2012123179A1 *

Also Published As

Publication number Publication date
DE102011005421A1 (de) 2012-09-13
WO2012123179A1 (fr) 2012-09-20

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