EP2839532A1

EP2839532A1 - Data memory for an electrical energy store

Info

Publication number: EP2839532A1
Application number: EP13715990.1A
Authority: EP
Inventors: Jens Schneider; Anne HEUBNER; Fabian Henrici
Original assignee: Robert Bosch GmbH; Samsung SDI Co Ltd
Current assignee: Robert Bosch GmbH; Samsung SDI Co Ltd
Priority date: 2012-04-18
Filing date: 2013-04-15
Publication date: 2015-02-25
Also published as: CN104412443A; CN104412443B; WO2013156420A1; DE102012206336A1

Abstract

The invention relates to a data memory (1) for an electrical energy store (9), in particular for a module of a lithium-ion battery in vehicles, characterized by an interface (2) for connecting to at least one sensor (4, 5, 6) for determining one or more measured values of one or more operating variables of the electrical energy store (9) and/or for determining one or more measured values of one or more external influencing variables that influence the electrical energy store (9) and a memory unit (14, 15, 16) for storing the determined measured values.

Description

Description title

Data storage for an electrical energy storage state of the art

The invention is based on a device for storing

Operating variables of an electrical energy storage device, in particular of a storage battery in vehicles. Embodiments are known in the prior art in which the operating data are stored in specially provided memory units of a central management system of the accumulator.

In the document DE 10 2008 041 518 AI an accumulator monitoring unit is shown, which comprises an electrically connectable to a motor vehicle accumulator and arranged on this sensor device. The monitoring device further comprises a detection and a

Data processing unit, to which the operating variables of the accumulator detected by the sensor device are forwarded via a cable connection.

Disclosure of the invention

ADVANTAGES OF THE INVENTION The data memory according to the invention with the features of the independent one

Claim has the advantage that every electrical

Energy storage unit is assigned its own data storage. Via an interface of the data memory, a connection to at least one sensor is provided in each case, the measured values both to operating variables of the electrical energy storage and to external influencing variables on the determined electrical energy storage. These readings are in the

Data stores are stored and are thus unique to the

Data store associated energy storage associated. In addition, when replacing an energy storage unit, the associated data can be exchanged in a simple manner.

The measures listed in the dependent claims are advantageous developments and improvements in the independent

Claim specified device possible.

In an advantageous embodiment are for individual cells of the

Energy storage one or more sensors provided, which are connected via the interface with the data memory. Thus, measured values can be recorded both on operating variables of individual cells as well as measured values of external influencing variables on individual cells in the data memory, which is particularly advantageous when using cell-balancing algorithms.

Conveniently, the data memory at the electrical

Energy storage unit attached. This improves the coherence of the energy storage and its data. In addition, it is advantageous in this case that, in the case of a corresponding permanent attachment, impermissible manipulation of the data can be prevented by simply exchanging the data memory.

In an advantageous development of the device, at least part of the data memory is designed to permanently store written data in an unchangeable manner. This enables a trusted reconstruction of the measurement data chronology. It is expedient in this case if the so-called aging-relevant data are stored in this part of the memory, which are particularly relevant for an assessment of the wear of the energy storage unit.

In a further advantageous embodiment of the invention, the

Datastore an interface to a device for controlling the Data storage and / or the energy storage on. Preferably, this is a computing device which supplies the data memory with energy and provides sensor data. In this case, it is particularly advantageous if the computing device centrally controls a plurality of data memories, preferably via a suitable bus system such as, for example, a LIN, a CAN or a PCL bus. The sensor data can be processed in the central device and / or forwarded for evaluation to the data memory of the corresponding energy storage, if this has the necessary evaluation electronics.

In an advantageous development, the interface of the data memory is designed to communicate with at least one sensor via the device for controlling the data memory.

In an alternative embodiment of the invention, the interface of the

Data memory designed to communicate directly with at least one sensor. This has the advantage that the measured values of the sensor are forwarded directly and without intermediate processing to the data memory and evaluated there.

In a further advantageous embodiment of the invention, it is possible to attach one or more sensors to the data memory. This supports the modular design of an energy storage system, as in an exchange of individual elements, the energy storage unit together with the

associated data memory and the associated sensors can be replaced. By observing common standards and norms, the manufacturer-independent combination of different modules is thus possible in a particularly simple manner. In a particularly advantageous development, the data memory has a

Interface to an external reader. Thus, the data relating to a respective energy storage unit can be retrieved directly without having to go through a possible central facility. The invention also relates to a method according to the invention, which is characterized in that one or more measured values of one or more operating variables of the electrical energy store and / or one or more measured values of one or more external influencing variables are stored in a memory unit of the data memory for an electrical energy store stored electrical energy storage. In this case, preferably the aging-relevant data are stored, which allow a reconstruction of the operating chronology of the electrical energy storage.

In an advantageous embodiment, one or more measured values of one or more operating variables of individual cells of the electrical

Energy storage and / or one or more measured values of one or more external factors influencing individual cells of the electrical

Energy storage stored in the data memory. This supports the targeted activation of individual cells when using cell-balancing algorithms.

Expediently, the strength of a current supplied to the electrical energy store and / or its individual cells and / or the strength of a current discharged from the energy store and / or its individual cells is preferably stored in the data memory in a time-dependent manner. In addition, it is advantageous, the operating voltage of the energy storage, also

preferably time-dependent to hold.

In a further development also the temperature of the electrical one becomes

Energy storage and / or its individual cells preferably stored time-dependent in the data memory.

Furthermore, it is advantageous if a measured vibration of the electrical energy store and / or its individual cells is preferably retained in the memory in a time-dependent manner.

Another advantage is the recording of operating times and

Inactivity times of the electrical energy storage and / or its individual cells in the data memory. A further advantageous embodiment of the invention also includes the

Storage of the state of charge of the electrical energy storage and / or its individual cells in the data memory, which is also preferably made time-dependent.

A particularly advantageous embodiment of the invention provides a method in which measured values are stored in the data memory only when the variables associated with the measured values fall below and / or exceed one or more predetermined critical values. This allows the targeted

Storage of defined damaging events and also reduces the necessary memory size of the data memory.

Brief description of the drawings

Embodiments of the invention are illustrated in the drawings and explained in more detail in the following description. Show it

1 shows a schematic representation of a data memory 1 for an electrical energy store 9 together with three sensors 4, 5, 6, an optional external reading device 7 and a device 3 for controlling a data memory 1.

FIG. 2 shows a schematic representation of a data memory 1 together with the associated energy store 9 and a connected sensor 4.

Figure 3 is a schematic representation of an internal structure and a

Memory segmentation of the data memory 1.

DETAILED DESCRIPTION FIG. 1 shows a data memory 1 for an electrical energy store 9 with an interface 2 for three sensors 4, 5, 6 in this embodiment via a device 3 for controlling the data memory 1 and an optional external reading device 7 via a second interface 8 is shown. At the device 3 for controlling the data memory 1 further sensors and other data storage for other energy storage units be connected. The energy storage units can be embodied, for example, as cells or modules of a lithium-ion accumulator for use in motor vehicles, in particular for operating a motor vehicle

Electric motor or other electrical on-board systems.

In a particular embodiment of the invention, sensors are provided for individual cells of the energy store 9, the measured values for the

Operating variables of the individual cells and / or measured values to the outside

Determine influencing variables on the individual cells and forward via the interface 8 to the data memory 1 of the module comprising the cells.

In a preferred embodiment of the invention, the data memories are centrally controlled by the device 3. The sensors 4, 5, 6 measure

Operating variables of the electric energy storage 9 such as

Current, voltage, and state of charge and / or external factors influencing the electrical energy storage 9 such as temperature or

Vibration. The measured values of the sensors can either be preprocessed in a suitable arithmetic unit 3 or forwarded via an interface 2 to the data memory 1, in which they are processed and stored using suitable electronics.

In a further preferred embodiment, a part of the data memory 1 is designed so that the written data is stored permanently and unchangeably. For this purpose, the data memory 1, for example, as

EEPROM executed. In this part of the memory so-called aging-relevant data can be stored, which justify a chronology of the operation, the so-called operating history of the electrical energy storage 9. These include operating times and periods of inactivity as well as during the

Operating times supplied and discharged services under thereby prevailing current and voltage conditions. Also the occurred

Temperatures can be logged.

The recording of the time courses of the charging and discharging currents, for example by the use of a Hall element direct current sensor, and the temperatures prevailing in the process is of particular importance since there are large quantities Amperages at too high or too low operating temperatures can cause rapid wear or even damage to the energy storage 9. Storing the number of charge and discharge cycles may also be useful.

The operating history of an energy storage unit can be used in a modular energy storage topology, whose control is preferably based on cell-balancing algorithms, as a basis for decision-making for the connection of this unit to the operation. Heavily worn modules are preferably connected only with a high power requirement.

An advantageous development relates to the possibility of reading out the stored data via an additional interface 8 with the aid of an external reading device 7. The data is read directly from the data memory 1. It is not necessary here, via the device 3 for controlling the

Data memory to access the data memory 1. The read-out can therefore preferably also be performed when the data memory 1 is not connected to the device 3. In a further embodiment, by the reader 7 via the

Interface 8 also written data in the data memory 1 and / or existing data are deleted.

FIG. 2 shows the data memory 1 which is connected to the associated electrical

Energy storage 9 is attached. In addition, the sensor 4 is both on the

Data storage 1 and attached to the energy storage 9. The attachment can by a cohesive method, for example by a

Plastic adhesive connection, or by a non-positive fixation, for example by a snap connection done. An attachment of the data memory 1 to the terminals of the energy storage device 9, which form the so-called module terminal is also possible. This embodiment facilitates access to the data memory 1 via the external reader 7, since usually the energy storage 9 is installed in an energy storage topology in a manner that allows easy access to the module terminal. In order to prevent inadmissible manipulation of the data by simply exchanging the data memory 1, a mechanically non-detachable fixing of the data memory 1 to the energy store 9 can be provided. In one of the above ways each other sensors on the

Data storage 1 and / or be attached to the energy storage 9.

In the illustrated example, the data memory 1 receives the required energy via the connection 10 from the electrical energy store 9. The measured values determined via the connection 12 are transmitted by the sensor 4 via the

Transfer connection 11 to the data memory 1. Thus form the

Data memory 1, the sensor 4 and the energy storage 9, a unit which can be preferably used in an energy storage topology with a modular design. Here is also the use of a uniform

Standard data format for the measured values and a uniform format for the

Interface to other modules and to a central control device of advantage and supports the manufacturer-independent use of

Energy storage modules. The connection 11 can be embodied, for example, as a preferably bidirectional data bus, in particular a LIN or CAN data bus. Alternatively, the use of a PLC bus system is possible, along with a reduction in the number of required connections and interfaces.

FIG. 3 shows a schematic representation of an exemplary embodiment of the data memory 1. A control unit 13, also called a microcontroller, connects the interface 2 to a volatile memory 14, for example a RAM memory, a non-volatile memory 15, for example a flash memory, and one only write-once memory 16, also called one-time programmable.

The volatile memory 14 is used for buffering and processing incoming data, which are then stored in the nonvolatile memory 15 or in the memory 16. Aging-relevant data to be protected from manipulation of third parties are preferably written in the memory 16. Alternatively or additionally, it is also possible to Modification of such data by means of appropriate software-level programming. Expediently, data that is specified during the production of the energy store 9, such as, for example, a module ID, are stored in the non-rewritable memory 16.

In a particular embodiment of the invention, at least some or all of the data is stored in the form of a version history. Changes to the data are saved with a time stamp in addition to the previous data. This allows a reconstruction of the temporal change of the data. In a simple embodiment is per charge and / or

Discharge each one bit in the write-once memory 16 from 0 to 1 set.

In alternative embodiments, at least one of the memories 14, 15, 16 may be integrated in the microcontroller 13 or formed as a separate component and connected to the data memory 1 via a suitable interface.

In a particular embodiment of the invention, measured values are only stored in the data memory 1, preferably in the memory 16 which can only be written once, if the variables associated with the measured values fall below and / or exceed one or more predefined critical values. These critical values define for the energy storage 9 damaging events such as a deep discharge or a

Overheating. Basically, the critical values depend on the type and quality of the respective energy store 9 used. Such a method allows the size of the data memory 1 to be reduced in comparison with the embodiments described above. As a result, a cheaper and smaller design of the data memory 1 is possible.

Claims

claims

1. Data memory (1) for an electrical energy store (9), in particular for a module of a lithium-ion battery in vehicles, characterized by an interface (2) for connection to at least one sensor (4, 5, 6) for determining one or more readings from one or more

Operating variables of the electrical energy store (9) and / or for determining one or more measured values of one or more external influencing variables on the electrical energy store (9)

and a storage unit (14, 15, 16) for storing the determined measured values.

2. Data memory according to claim 1, characterized in that the interface (2) is designed for connection to one or more sensors of one or more cells of the energy store (9), wherein the one or more sensors for determining one or more measured values of one or more operating variables of the respective cell of the electrical energy store (9) and / or for determining one or more measured values of one or more external influencing variables on the respective cell of the electrical

Energy storage (9) are provided.

3. Data memory according to one of the preceding claims, characterized

in that the data memory (1) is designed for attachment to the electrical energy store (9).

4. Data memory according to one of the preceding claims, characterized

in that at least a part (16) of the data memory (1) is designed to permanently store registered data in a fixed and unchangeable manner.

5. Data memory according to one of the preceding claims, characterized

in that the data memory (1) has an interface (2) to a Device (3) for controlling the data memory and / or for controlling the energy storage device (9).

6. Data memory according to claim 5, characterized in that the interface (2) is adapted to communicate via the means for controlling the data memory with the at least one sensor (4, 5, 6).

7. Data memory according to one of claims 1 to 5, characterized in that the interface (2) for connection to at least one sensor is adapted to communicate directly with the at least one sensor (4, 5, 6).

8. Data memory according to one of the preceding claims, characterized

in that the data memory (1) is designed to attach the at least one sensor (4) to the data memory (1).

9. Data memory according to one of the preceding claims, characterized

in that the data memory (1) has an interface (8) to an external reading device (7).

10. A method for storing data in a data memory (1) for an electrical energy store (9), in particular for a module of a lithium-ion battery in vehicles, characterized in that in one

Memory unit (14, 15, 16) of the data memory (1) one or more measured values of one or more operating variables of the electrical energy store (9) and / or one or more measured values of one or more outer

Influencing variables are stored on the electrical energy storage (9).

11. The method according to claim 10, characterized in that in the memory unit (14, 15, 16) of the data memory (1) one or more measured values of one or more operating variables of one or more cells of the energy store (9) and / or one or multiple readings from one or more outer

Influencing variables are stored on one or more cells of the energy storage (9).

12. The method according to claim 10 or 11, characterized in that a strength of the energy store (9) and / or its cells supplied and / or discharged from the energy storage (9) and / or its cells stream preferably time-dependent in the data memory (1) is stored.

13. The method according to claim 10 to 12, characterized in that a

Operating voltage of the energy storage device (9) and / or its cells is preferably stored time-dependent in the data memory (1).

14. The method according to any one of claims 10 to 13, characterized in that a temperature of the electrical energy storage device (9) and / or its cells is preferably stored time-dependent in the data memory (1).

15. The method according to any one of claims 10 to 14, characterized in that a vibration of the electrical energy storage device (9) and / or its cells is preferably stored time-dependent in the data memory (1).

16. The method according to any one of claims 10 to 15, characterized in that a duration of an operating time and / or a period of inactivity time of the electrical energy storage device (9) and / or its cells in the data memory (1) are stored.

17. The method according to any one of claims 10 to 16, characterized in that a state of charge of the electrical energy storage device (9) and / or its cells is preferably stored time-dependent in the data memory (1).

18. Method according to claim 10, characterized in that the measured values are only stored in the data memory (1) if the variables associated with the measured values fall below and / or exceed one or more predefined critical values.