WO2018061459A1

WO2018061459A1 - Wireless battery system

Info

Publication number: WO2018061459A1
Application number: PCT/JP2017/027613
Authority: WO
Inventors: 孝徳山添; 啓坂部
Original assignee: 株式会社日立製作所
Priority date: 2016-09-30
Filing date: 2017-07-31
Publication date: 2018-04-05
Also published as: JPWO2018061459A1; JP6808742B2

Abstract

A wireless battery system in which predetermined time slots are assigned to a first cell controller and a second cell controller, wherein the second cell controller detects a first transmission radio wave travelling from the first cell controller to a battery controller, and after the first transmission radio wave is no longer detected by the second cell controller, a second transmission radio wave from the second cell controller is transmitted to the battery controller independently of the time slots assigned to the second cell controller.

Description

Wireless battery system

The present invention relates to a wireless battery system.

Large secondary battery systems represented by power sources for hybrid electric vehicles and electric vehicles need to have high output and large capacity, so the storage battery module that composes them has multiple batteries (cells). Are connected in series and parallel. In addition, a lithium ion secondary battery that is a secondary battery requires appropriate use of a secondary battery such as prevention of high-voltage charging and deterioration of performance due to overdischarge. For this reason, the storage battery module mounted on a hybrid electric vehicle or an electric vehicle has a function of detecting voltage, current, temperature, and the like, which are battery states.

Fig. 1 shows the general configuration of a storage battery module mounted on a hybrid electric vehicle or an electric vehicle. The storage battery module 1000 includes a battery cell group 10, a plurality of cell controllers 100, and a battery controller 200. As shown in FIG. 1, the battery cell group 10 is connected to a cell controller 100, and the cell controller 100 measures the state of the battery cell group 10. The plurality of cell controllers 100 are connected to the battery controller 200, and the battery controller 200 acquires the states of the plurality of battery cell groups 10 from the plurality of cell controllers 100. Furthermore, the battery controller 200 calculates a state of charge (SOC: State of Charge) and a state of battery deterioration (SOH: State of Health) from the acquired state of the battery cell group 10. In FIG. 1, the battery controller 200 and the cell controller 100 are wired communication.

According to Patent Document 1, the cell controller and the battery controller are changed from wired to wireless to reduce the wiring cost, the insulation cost for high voltage countermeasures, and the assembly cost. Patent Document 2 describes a wireless communication protocol between a battery controller and a cell controller as a power storage management system and a recovery process at the time of a communication error.

JP 2005-135762 A WO2016 / 072002

In Patent Document 2, time division communication is used as a wireless communication method between a battery controller and a plurality of cell controllers, and the battery controller periodically receives data from a plurality of cell controllers. In this case, the data read time of a plurality of cell controllers is fixed for a predetermined period, and the reading time can be increased or varied by temporarily turning off the battery controller and cell controller and resetting the time division communication. It took time and effort.

It is an object of the present invention to allow each cell controller to transmit data of each cell controller to the battery controller at an appropriate timing even when the data of each cell controller changes during communication with a plurality of cell controllers. A wireless communication system is provided.

The features of the present invention for solving the above problems are as follows, for example.

A plurality of cell controllers having a first cell controller connected to the first battery group and a second cell controller connected to the second battery group, the first cell controller and the second cell A battery controller that is wirelessly connected to the controller, a predetermined time slot is assigned to the first cell controller and the second cell controller, and the second cell controller is connected to the battery from the first cell controller. The second cell controller is detected independently of the time slot assigned to the second cell controller after the first transmission radio wave to the controller is detected and the first cell radio wave is not detected by the second cell controller. A wireless battery system that transmits the second transmitted radio wave to the battery controller.

According to the present invention, even when the battery controller communicates with a plurality of cell controllers, even when the data of each cell controller changes, each cell controller can transmit the data of each cell controller to the battery controller at an appropriate timing. Can provide a system. Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

It is a block diagram of the vehicle-mounted storage battery module. 1 is a configuration diagram of a wireless battery system according to an embodiment of the present invention. It is a wireless communication timing diagram between the battery controller and cell controller which concerns on one Embodiment of this invention. It is a circuit block diagram of the cell controller which concerns on one Embodiment of this invention. It is a circuit block diagram of the battery controller which concerns on one Embodiment of this invention. It is a radio | wireless communication timing diagram of the battery controller which concerns on one Embodiment of this invention, and a cell controller. It is a wireless communication timing diagram of the parent device and the child device of the present invention. It is a receiver circuit block diagram of the cell controller which concerns on one Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following description shows specific examples of the contents of the present invention, and the present invention is not limited to these descriptions. Various modifications by those skilled in the art are within the scope of the technical idea disclosed in this specification. Changes and modifications are possible. In all the drawings for explaining the present invention, components having the same function are denoted by the same reference numerals, and repeated description thereof may be omitted.

In this embodiment, in a wireless battery system in which a battery controller and a plurality of cell controllers communicate with each other wirelessly, the plurality of cell controllers detect a transmission radio wave from the cell controller before being transmitted to the battery controller, and transmit Data of the cell controller is transmitted to the cell controller after the radio wave is not detected.

FIG. 2 shows a configuration diagram of a wireless battery system according to an embodiment of the present invention. In the basic configuration, one battery controller 200 and a plurality of cell controllers 100 construct a network and perform communication using a wireless packet between the battery controller 200 and the plurality of cell controllers 100.

FIG. 3 is a wireless communication timing diagram between the battery controller and the cell controller of the present invention. As shown in FIG. 3, the communication between the battery controller 200 and the cell controller 100 is time-division communication. After transmitting the synchronization signal from the battery controller 200 to the cell controller 100, each cell controller 100 is connected to the battery in a predetermined communication slot. Data of each cell controller 100 is transmitted to the controller 200. However, this communication slot time Δ (delta) t is variable. In FIG. 3, the cell controller 100-1 (first cell controller) is in slot 1, the cell controller 100-2 (second cell controller) is in slot 2, and the cell controller 100-n is in slot n in turn. In this example, data of the cell controller 100 is transmitted to the battery controller 200. Each cell controller 100 is assigned a predetermined time slot.

FIG. 4 shows a circuit configuration diagram of the cell controller. Each cell controller 100 is attached to a battery cell group 10 including one or a plurality of battery cells, and measures the state (voltage, current, temperature, etc.) of the battery cell group 10. In the cell controller 100, one or a plurality of sensors 20 that measure the state (voltage, current, temperature, etc.) of the battery cell group 10, a processing unit 30 that acquires and processes the state information of the battery cell group 10, and a radio circuit 40 And an antenna 50 for inputting and outputting radio waves.

The processing unit 30 includes a power supply circuit 31 that receives power from the battery cell group 10 to generate an operating voltage, an A / D conversion circuit 32 that converts an analog value measured by the sensor 20 into digital data, and an A / D conversion circuit. The CPU 33 outputs the data converted by 32 to the radio circuit 40, the memory 34 for storing individual identification information (unique ID) and the like, and the clock generator 35.

The clock generator 35 can oscillate by switching between a high-speed clock of about several MHz and a low-speed clock of about several tens of kHz. Further, based on data from the radio circuit 40, the CPU 33 turns on / off the radio circuit 40 and some of the circuits in the CPU 33, switches the clock frequency of the clock generator 35, reads / writes to the memory 34, and a battery controller. Instructions from 200 can be executed.

FIG. 5 shows a circuit configuration diagram of the battery controller. The battery controller 200 includes a wireless circuit 210, a CPU 220, a power supply circuit 230 including a battery, a memory 240, and an antenna 250. The power supply circuit 230 has a built-in battery in FIG. 5, but power may be supplied from the outside.

The transmission / reception timing of the battery controller 200 and the cell controller 100 will be described with reference to FIG. The battery controller 200 transmits a synchronization signal to each cell controller 100 in order to receive data from each cell controller 100. Upon receiving this synchronization signal, the cell controller 100 recognizes the initial communication slot time set by the battery controller 200 and the cell controller 100 in advance, and each cell controller 100 stores the data in each cell controller 100 into the battery controller 200. The communication slot to be transmitted to is determined.

When the cell controller 100-1 receives the synchronization signal from the battery controller 200, the cell controller 100-1 immediately transmits data (first transmission radio wave) to the battery controller 200 in the slot 1. As a result, the synchronization signal from the battery controller 200 transmitted to the cell controller 100-1 indicates the head of the communication slot, and the shift in timing for transmitting data from each cell controller 100 to the battery controller 200 can be reduced. When the cell controller 100-2 receives the synchronization signal from the battery controller 200, the cell controller 100-2 switches to passive reception with low power consumption instead of the reception amplifier, and receives data transmission from the cell controller 100-1 to the battery controller 200. After confirming the end of data transmission from the cell controller 100-1 to the battery controller 200, the data (second transmission radio wave) is transmitted to the battery controller 200. By switching the cell controller 100-2 to passive reception, it is possible to operate with low power consumption.

At this time, when the data transmission time from the cell controller 100-1 to the battery controller 200 is less than the initial communication slot time Δ (delta) t, the communication slot time is shortened accordingly and the slot 2 is started. Further, when the data transmission time from the cell controller 100-1 to the battery controller 200 is equal to or longer than the initial communication slot time Δ (delta) t, the communication slot time becomes longer and the slot 2 starts. This is shown in FIG.

FIG. 6 is a wireless communication timing diagram of the battery controller and the cell controller. In FIG. 6, the cell controller 100-2 detects the first transmission radio wave from the cell controller 100-1 to the battery controller 200, and after the cell controller 100-2 does not detect the first transmission radio wave, The second transmission radio wave of the second cell controller 100-2 is transmitted to the battery controller 200 independently of (or irrespective of) the time slot assigned to the cell controller 100-2. Thus, even when the battery controller 200 is communicating with a plurality of cell controllers 100 and the data of each cell controller 100 is variable, each cell controller 100 sends the data of each cell controller 100 to the battery controller 200 at an appropriate timing. The time required for the battery controller 200 to read the plurality of cell controllers 100 can be varied and the speed can be increased.

6A is a timing chart when the data transmission time from each cell controller 100 to the battery controller 200 is shorter than the initial setting Δ (delta) t. FIG. 5 is a timing chart when the data transmission time from the battery controller 200 to the battery controller 200 is longer than the initial setting Δ (delta) t. FIG. However, when the cell controller 100-2 cannot receive (detect) the data transmission from the cell controller 100-1 to the battery controller 200, the timing (t2) (predetermined time slot) of the slot 2 set initially is set. Data (second transmission radio wave) is transmitted to the battery controller 200. Thereby, the cell controller 100-2 can transmit the state of the battery cell such as the voltage of the battery cell to the battery controller 200 even when the first transmission radio wave is not detected.

Similarly to the cell controller 100-2, when the cell controller 100-3 receives the synchronization signal from the battery controller 200, the cell controller 100-3 switches to passive reception with low power consumption, and the cell controller 100-2 transmits the signal to the battery controller 200. After receiving the data transmission and confirming the end of the data transmission from the cell controller 100-2 to the battery controller 200, the cell controller 100-3 transmits the data to the battery controller 200. At this time, similarly to the cell controller 100-2, if the data transmission from the cell controller 100-2 to the battery controller 200 can be received, the cell The controller 100-3 transmits data to the battery controller 200. When data transmission from the cell controller 100-2 to the battery controller 200 cannot be received, the cell controller 100-3 transmits data to the battery controller 200 at the initially set slot 3 timing (t3).

The battery controller 200 receives the data transmission of all the cell controllers 100 (cell controller 100-1 to cell controller 100-n), receives the data from the last cell controller 100-n, or passes a predetermined time. Later, the synchronization signal is transmitted again to all the cell controllers 100 to prompt data transmission from each cell controller 100 to the battery controller 200. This is repeated periodically. Thereby, the battery controller 200 can periodically transmit a synchronization signal from the battery controller 200 to each cell controller 100 regardless of the response status from the cell controller 100, and the interruption of communication can be suppressed.

After transmitting data to the battery controller 200, each cell controller 100 estimates the reception timing of the synchronization signal from the next battery controller 200, sets a reception timer to receive the synchronization signal at that timing, Transition to power consumption sleep mode. In other words, for example, the cell controller 100-1 estimates the timing of the synchronization signal transmitted from the battery controller 200 to the cell controller 100-1 based on the data transmission timing of the cell controller 100-1, and receives the synchronization signal. .

Here, after each cell controller 100 transmits data to the battery controller 200, an estimation formula of the reception timing (T) of the synchronization signal from the next battery controller 200 is shown in (Formula 1), and a timing diagram is shown in FIG. In (Expression 1), t _L is a data transmission time from each cell controller 100 to the battery controller 200, n is the number of communication slots or the number of cell controllers 100, k is a transmission slot number of each cell controller 100, α is a margin, is there.
T = t _L × (n−k) −α (Equation 1)

In the case of the cell controller 100-1, since the transmission slot number is 1, the reception timing T of the synchronization signal from the next battery controller 200 from (Equation 1) is T = t _L × (n−1) −α.

In the case of the cell controller 100-3, since the transmission slot number is 3, the reception timing T of the synchronization signal from the next battery controller 200 from (Equation 1) is T = t _L × (n−3) −α. . However, when each cell controller 100 cannot receive the transmission of the neighboring cell controller 100 (for example, when the cell controller 100-2 cannot receive the transmission of the cell controller 100-1), the initial setting is made. Is set to receive the synchronization signal of the battery controller 200 at the timing. As described above, each cell controller 100 can receive without missing the synchronization signal of the battery controller 200 and can continue communication.

Next, the reception method of each cell controller 100 will be described. Each cell controller 100 receives the synchronization signal from the battery controller 200 in view of the fact that the battery controller 200 is not installed in the vicinity of each cell controller 100, and is similar to the receiving circuit configuration in normal wireless communication. As described above, the signal is received by the configuration of the LNA 400 (low noise amplifier) and the mixer 410. FIG. 8 is a block diagram of the receiving circuit of the cell controller.

In passive reception in which each cell controller 100 receives a transmission radio wave of an adjacent cell controller 100, there is a method of detecting reception intensity with a diode 300 and a capacitor 310 as shown in FIG. 8 without using an amplifier (amplifier). Further, it is possible to detect the amplitude-modulated wave of the cell controller 100 with the circuit of the diode 300 and the capacitor 310.

DESCRIPTION OF SYMBOLS 10 Battery cell group 20 Sensor 30 Processing part 31 Power supply circuit 32 A / D converter 33 CPU
34 Memory 35 Clock generator 40 Radio circuit 50 Antenna 100 Cell controller 100-1 Cell controller 100-2 Cell controller 100-3 Cell controller 100-n Cell controller 200 Battery controller 210 Radio circuit 220 CPU
230 Power supply circuit 240 Memory 250 Antenna 300 Diode 310 Capacitor 400 LNA
410 Mixer 1000 Battery module

Claims

A plurality of cell controllers having a first cell controller connected to the first battery group and a second cell controller connected to the second battery group;
A battery controller wirelessly connected to the first cell controller and the second cell controller;
A predetermined time slot is assigned to the first cell controller and the second cell controller,
The second cell controller detects a first transmission radio wave from the first cell controller to the battery controller,
After the non-detection of the first transmission radio wave by the second cell controller, the second transmission radio wave of the second cell controller is independent of the time slot allocated to the second cell controller. A wireless battery system that transmits to the battery controller.
The wireless battery system according to claim 1, wherein
The first cell controller is a wireless battery system that transmits the first transmission radio wave to the battery controller in a predetermined time slot after receiving a synchronization signal from the battery controller.
The wireless battery system according to claim 1, wherein
The second cell controller is a wireless battery system that detects the first transmission radio wave by passive reception.
The wireless battery system according to claim 1, wherein
When the second cell controller cannot detect the first transmission radio wave, the second cell controller transmits a second transmission radio wave to the battery controller in a predetermined time slot.
The wireless battery system according to claim 1, wherein
The first cell controller estimates the timing of a synchronization signal transmitted from the battery controller to the first cell controller based on the transmission timing of the first transmission radio wave, and receives the synchronization signal. .
The wireless battery system according to claim 1, wherein
The battery controller is a wireless battery system that transmits a synchronization signal to the plurality of cell controllers when receiving a transmission radio wave from a predetermined cell controller in the plurality of cell controllers.
The wireless battery system according to claim 1, wherein
The wireless battery system, wherein the battery controller transmits a synchronization signal to the plurality of cell controllers when the transmission radio wave from the predetermined cell controller in the plurality of cell controllers cannot be received even after a predetermined time slot time elapses.