KR20150022778A - Method and apparatus for data transmission via a battery connection - Google Patents

Abstract

The present invention relates to a method 200 for data transmission through a battery connection 104 wherein the data transmission is interrupted by at least one interfering pulse 400 and the method 200 comprises the steps of: (202), wherein the data packet (402) is transmitted and / or received with a time offset for the interfering pulse (400), and transmitting and / or receiving at least one data packet do.

Description

[0001] METHOD AND APPARATUS FOR DATA TRANSMISSION VIA A BATTERY CONNECTION [0002]

The present invention relates to a method for data transmission through a battery connection, a corresponding device, an energy storage device and a corresponding computer program product.

DE 10 2009 036 086 A1 discloses an electronic monitoring device for a battery.

It is an object of the present invention to provide a method and apparatus for data transmission through a battery connection.

The problem is solved by a method comprising the features of claim 1 and an apparatus comprising the features of claim 8.

The invention provides a method for data transfer via a battery connection, according to independent claims, an apparatus for data transmission via a battery connection using the method, an energy storage device comprising a corresponding device, and a computer program product Is proposed. Preferred embodiments are set forth in the dependent claims and the following description.

Energy and information can be transmitted on the electrical line. In order to be able to receive the information, sufficient signal strength is required to make the information identifiable before the other vibrations or signals on the electrical conductor or electrical line.

The present invention is preferably based on the fact that a block of data can be transmitted and / or received within a blank between the interfering signal or vibration.

By transmission during the blank, the data can be transmitted at a low signal level. Since the signal-to-noise ratio is very large in a time slot in which no interference signal is generated on the line, a large amount of data can be transmitted technically through the line very simply and error-free. Communication is possible despite large interference amplitudes. Low signal levels reduce energy requirements. The cost for the electronics in the battery cell is lower (ASIC cost), because high drive power is not required in the transceiver.

The invention provides a method for data transmission via a battery connection, wherein the data transmission is interrupted by at least one interference pulse, the method comprising the steps of:

Transmitting and / or receiving at least one data packet through a battery connection, wherein the data packet is transmitted and / or received with a time offset for the interfering pulse.

The present invention also provides an apparatus for data transmission through a battery connection, the at least one corresponding device being configured to implement or execute steps of a method according to the present invention. The object of the present invention can also be solved quickly and efficiently by this modified embodiment of the present invention in the form of a device.

The invention also provides an energy storage device comprising an apparatus according to the proposed solution.

Data transmission may be the communication of two equipment, for example, a receiver and a transmitter. The transmitter can transmit a signal, and the receiver can receive a signal. Signals can be transmitted in two directions. In this case, the signal can cover the distance between the transmitter and the receiver. The battery connection may be an electrical conductor connected to one pole of the battery. The battery connection may be a line that guides the same current. The interference pulse may be, for example, a severe level variation of the current flow in one time slot on the battery connection. The interfering pulse may comprise a number of successive level fluctuations or vibrations. The vibration can be damped and attenuated. The data packet may have a predetermined length. The data packet may comprise a plurality of blocks. Multiple data packets may be transmitted and / or received in succession. The time offset may be a delay waiting until a data packet is transmitted and / or received after an interfering pulse. The energy storage device may be a battery or a battery battery.

A device is in this case an electrical device that processes sensor signals and outputs control signals and / or data signals accordingly. The device may include an interface that may be formed of hardware and / or software. When formed into hardware, the interfaces may be part of a so-called system-ASIC that includes various functions of the device, for example. However, the interfaces may be a unique integrated circuit or at least partially composed of discrete components. When formed into software, the interfaces may be software modules that reside, for example, with other software modules in the microcontroller.

The time offset can be determined using a predetermined threshold value of the signal level of the interference pulse. The transmission and / or reception after the pulse peak of the interference pulse can be waited until the interference pulse is attenuated below the threshold value. This allows transmission at low transmission power, and data packets can be received at a low signal level.

The time offset can be determined according to the maximum level of the interference pulse. If the maximum level is large, the time slot may be larger. If the maximum level is small, the time offset may be smaller.

Whereby the time offset for transmission and / or reception can be adjusted to the variation amplitude of the direct interference pulse. The length of the time offset can be determined for a plurality of maximum levels in advance, for example by experiment. The time offset to be applied can be read from, for example, a table (look-up table). The time offset can also be determined by the processing rule. The time offset can be quickly determined immediately following the passage of the maximum level.

Information about the time offset can be extracted from the data packet. The time offset can be controlled by the central control unit. The time offset can also be sent to multiple users of the method simultaneously. Alternatively, the time offset may be triggered by a trigger pulse on the battery line.

The method may include detecting a duration between an interfering pulse and another interfering pulse, wherein a time offset not greater than the duration is used in transmitting and / or receiving the data packet. The other interference pulse may be a leading or trailing interference pulse. By detection of the duration, for example, the data packet can be transmitted and / or received between two interfering pulses.

The method may include a step that affects the point of occurrence of the interfering pulse. The effect can be a trigger or a release. For example, an interfering pulse can be triggered by a trigger signal. This allows, for example, a predetermined time for communication to be vacated.

The point of view can be synchronized with the frequency reference. The frequency reference may be a system clock. Communication at the battery connection can be optimized by synchronization of the interference clock. The transmission and / or reception may also be synchronized with respect to the frequency reference. For example, the interfering pulse and transmission and / or reception may be triggered alternately.

Also preferred is a computer program product comprising program code, wherein the program code can be stored in a machine-readable carrier, such as a semiconductor memory, hard disk memory or optical memory, and, when the program product is run on a computer or device, And is used for the implementation of the method according to one of the embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described below by way of example with reference to the accompanying drawings.

1 illustrates a battery including an apparatus for data transmission through a battery connection according to an embodiment of the present invention.
2 is a flow diagram of a method for data transmission over a battery connection interfered by an interfering signal, in accordance with an embodiment of the present invention.
3 illustrates a drive system including a battery according to an embodiment of the present invention.
Figure 4 illustrates an interfering pulse comprising an interleaved data packet transmitted by a method for data transmission through a battery connection according to an embodiment of the present invention.

In the following description of the preferred embodiments of the present invention, members that are shown and operate in different drawings are denoted by the same or similar reference numerals, in which case repetitive descriptions of the members are omitted.

FIG. 1 illustrates a battery 100 including devices 102 for data transmission through a battery connection 104 in accordance with an embodiment of the present invention. The devices 102 are disposed in the battery cell 106 of the battery 100 in this embodiment. In FIG. 1 there are shown four battery cells 106 that are connected in series and implemented identically, for example, in a multiplier 100. The battery 100 may include more or fewer battery cells 106. An electrochemical storage element 108 is disposed within the battery cell 106. The storage element 108 has a positive pole and a negative pole, and the poles are guided through the sleeve of the battery cell 106. Outside the battery cell 106, a pole is connected to the DC line 104. A device 102 is connected between the plus and minus poles. The device 102 is configured to transfer data from the battery cell 106 through the line 104. Sensors and data processing devices within battery cell 106 are not shown. The battery 100 includes a control device 110 in this embodiment that is configured to communicate with a device 102 that is configured to communicate with the device 102 via the DC line 104 by a method according to the proposed solution 112). For example, the control device 110 can inquire about the battery status of the individual battery cells 106. Control device 110 and device 112 are connected to DC line 104 for this purpose. In this embodiment, the control device 110 is connected between the positive pole and the negative pole of the battery 100. [ The control device 110 can communicate with other equipment outside the battery 100 through the battery connection part 104. [ To this end, the devices may also include devices according to the proposed solution herein.

1 shows a battery 100 in which electronic elements 102 are formed to exchange data (power line communication) synchronously with respect to an interferer through a pole terminal or current connection line 104 of a battery cell 106 Respectively. The battery 100 may be implemented as a lithium ion accumulator, for example, as an electric vehicle (EV) or a traction battery 100 for a hybrid vehicle (HEV).

The battery 100, particularly the traction battery of the EV / HEV, which is monitored at least during charging and / or discharging, is connected to an interferer (especially a charging / discharging load, especially a charging / discharging load) via the pole terminal or current connection line 104 of the battery cell 106 (E.g., an inverter or an electric motor). A method for enabling such interference and synchronous data transmission within the battery 100 is implemented in the device 102.

Synchronization may be accomplished by the master transceiver 110. The master transceiver 110 is preferably not necessarily located within the control device. Synchronization pulses of the master used to synchronize communication under the node are automatically synchronized to the forwards between the interfering pulses. It is particularly advantageous when a TDMA method is used for the control of communication, in which the communication of the nodes is done in a time-adjusted manner.

Each node can independently synchronize the transmit window to the interference fence. It is particularly advantageous when a method such as CDMA, in which the communication of the node can be made simultaneously or without central control, is used for control of communication.

Synchronization to the system plane may be accomplished by deriving a clock for communication and / or inverter control according to a common frequency reference.

The synchronization to the interferer can be done by the self learning device. The apparatus may preferably be implemented as a PLL including a filter connected in front. This allows the oscillators of the transceiver to be kept synchronized by the PLL with respect to the interfering pulses (and thus also the forwards). This may be done centrally at the master 110 or separately at each transceiver.

The communication master 110 may assign a specific communication slot to the node in accordance with the local interference level variation in the battery. Nodes that are exposed to low interference levels due to location can basically get a more undesirable slot impending on the interfering pulse in time, while nodes that are exposed to high interference levels due to that location are likely to have the desired slot in the interference free window , Which may be a slot at the end of interference free time, especially if the interference is maximally attenuated.

2 illustrates a flow diagram of a method 200 for data transmission over a line or battery connection that directs a direct current interfered by an interfering signal, in accordance with an embodiment of the present invention. The method includes transmitting (202) alternately or complementarily at least one data packet over the line. In step 202, the data packet is transmitted with a time offset for the interfering pulse of the interfering signal, and is alternatively or complementarily received. Interference pulses of the interfering signal have regular time intervals. Within the time intervals the signal level on the line is low. At least one data packet is received and / or transmitted within the intervals. Interference pulses can result from a switching process in the power devices that convert DC into AC or DC into AC.

In other words, Figure 2 illustrates a method 200 for interference-synchronized communication over a power line in a battery. The method 200 enables interfering synchronous data transmission within the battery. The (measurement-) data transfer between the electronic elements distributed in the battery may be via a determined data line, for example a CAN bus. The battery can also exchange data by power line communication (PLC). The battery may include an integrated battery sensor that transmits data. The communication can be synchronized with the system clock, for example as an inverter control.

FIG. 3 shows a schematic diagram of a drive system 300 including a battery 100 according to an embodiment of the present invention. The battery 100 is connected to the inverter 302 via the DC line 104. The inverter 302 is connected to the three-phase electric motor M via the three-core line 304. [ The DC voltage of the battery 100 is converted into a three-phase AC voltage by the inverter 302. The three-phase AC voltage is guided to the three-phase motor M through the three-core line 304, where the three-phase AC voltage drives the rotor of the motor M. [ In order for inverter 302 to provide a three-phase alternating voltage, the direct voltage is converted into three phase shifted alternating voltages in a number of switching processes. The switching processes cause current pulses in the DC line 104. The current pulse has a high amplitude. The battery 100 includes at least one device according to the proposed solution here for data transmission via the DC line 104. As a result, a unique data line can be omitted. By the method according to the embodiment of the present invention, a control device not shown here can inquire status information of the battery 100, for example, through the DC line 104, It is possible to monitor the discharge process when the electric motor M operates. To do this, the device uses the forcing between current pulses, but the switching process is not done right away. In order to use the forwards, if the amplitude of the pulse is less than the threshold value, the data transmission may be done, for example, following the pulse. Also, for example, to avoid a trailing peak of the pulse, a residence time may be inserted between the pulse and the data transmission. The switching processes in inverter 302 may be coordinated by data transmission. As the repetition frequency of the switching processes increases, for example, the block length of the data transmission may decrease. Conversely, the interval between switching processes can have a minimum length, so that at least one block length can be transmitted in the forwards. Since the switching processes can be grouped and arranged, one phase can be formed with almost no fores, while the subsequent phase has a larger fores.

The traction battery 100 in the electric vehicle and the hybrid vehicle supplies energy to the inverter 302 and the electric motor (s) M. These, in particular inverter 302, cause severe interference due to clocked operation. Although the actual operating frequency is in the kHz range, harmonics up to the high MHz range also appear. Such interference can interfere with communication by the PLC and make it difficult. Clock-type interference signals having the same action by the battery charging device are also applied to the battery 100. For example, interference may be over-output by a higher transmit power. It is also possible for multiple transmissions to occur (randomly) until interference received. It is also possible to communicate by complicated encoding (duplication).

Typical clock frequencies of the inverter 302 are 1 to 100 kHz. In particular, different frequencies may appear within the system 300 during charging and discharging of the battery 100. In particular, 6 to 10 kHz for discharging (running operation) and 65 kHz for charging are disclosed.

Figure 4 illustrates the communication between interfering pulses comprising data packets 402 interposed between the interfering pulses 400 and the data packets are transmitted through a line directing a DC according to an embodiment of the present invention And transmitted by a method for data transmission. The interference pulse 400 and the data packet 402 are shown as columns on the time axis. The size of the column represents the signal strength, in this case in particular the current on the battery line. Interference pulse 400 has a much stronger signal strength than data packet 402. The data packet 402 and the interference pulse 400 have regular intervals, in which case the data packet 402 is transmitted over the line between two interference pulses 400, respectively. The interval 404 between two successive interfering pulses 400 corresponds to the operating clock of the inverter and is typically about 100 [mu] s at a frequency of 10 kHz. The data packets 402 have the same spacing 404 but are time offset with respect to the interfering pulse 400 by a half interval 404. This allows the data packet 402 to be transmitted reliably despite small amplitudes, since the interference pulse 400 does not overlap the data packet.

Although the interference is caused by the proposed solution, reliable and reliable communication by the PLC in the battery is possible. Since an important aspect is the synchronization of the transmission of the data packet 402 with the interferer, transmission between the interfering pulses 400 (temporally limited regular) is achieved.

The proposed solution here is universally applied to all batteries connected to an inverter or a similar clocked interferer.

The embodiments described above and shown in the drawings are selected by way of example only. Various embodiments may be combined with each other overall or with respect to individual features. Also, one embodiment can be supplemented by the features of another embodiment.

Also, the method steps according to the present invention can be repeated and performed differently from the described order.

If the embodiment includes "and / or" conjunction between the first and second features, this means that the embodiment includes a first feature and a second feature according to one embodiment, and according to another embodiment, Or < / RTI > a second feature.

100 battery
102 device
104 Battery connection
106 Battery Battery
108 storage element
110 control device
200 Methods
202 transmitting and / or receiving
300 drive system
302 inverter
304 three-core line
400 Interference Pulse
402 data packet

Claims (10)

A method (200) for data transmission through a battery connection (104), wherein data transmission is interrupted by at least one interfering pulse (400)
(202) transmitting and / or receiving at least one data packet (402) through the battery connection (104), the data packet (402) having a time offset for the interference pulse (400) ≪ / RTI > is transmitted and / or received. 2. The method of claim 1, wherein in the transmitting and / or receiving step (202), the time offset is determined using a predetermined threshold value of the signal level of the interference pulse (400). 3. The method of claim 1 or 2, wherein in the transmitting and / or receiving step (202), the time offset is determined according to a maximum level of the interference pulse (400). 4. A method according to any one of the preceding claims, characterized in that in the transmitting and / or receiving step (202) information about the time offset is extracted from the data packet (402). 5. A method according to any one of claims 1 to 4, comprising the step of detecting the duration between the interfering pulse (400) and another interfering pulse (400), wherein the data packet (402) is transmitted and / Wherein in the receiving step 202 a time offset not greater than the duration is used. 6. The method of any one of claims 1 to 5, comprising the step of influencing the time of occurrence of the interfering pulse (400). 7. The method of claim 6, wherein in the affecting step, the viewpoint is synchronized with a frequency reference. A device (102) for data transfer via a battery connection (104), comprising a device (112) configured to perform a method (200) according to any one of claims 1 to 7. An energy storage device (100, 106) comprising a device (102, 110) according to claim 8. A computer program product comprising program code for implementing a method according to any one of claims 1 to 7 when the program product is run on the device (102).

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