JP2000173674A - Monitoring device for set battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify structure of a monitoring device for a set battery. SOLUTION: A slave device 1 is constructed so as to receive electricity from a corresponding battery module B1 in a set battery B. A serial transmission line 3 is formed into a ring shape, returning to a master device 2 sequentially from the master device 2 via the slave device 1. A return wire 33, constituting the serial transmission line 3 and returning a signal current from a communication means 12 in the reception side slave device 1 to a gland in the transmission side slave device 1, is arranged inside the reception side slave device 1, while being connected to an electrical reception part 16 on the positive electrode side in the reception side slave device 1 at the same potential as the gland of the transmission side slave device 1 for substantially returning the signal current to the gland of the transmission side slave device 1. In this way, the number of wires arranged between the slave devices 1 is lowered for simplifying the structure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring apparatus for a battery pack, and more particularly to a monitoring apparatus for measuring terminal voltages of a plurality of battery modules constituting a battery pack.

[0002]

2. Description of the Related Art A battery pack is usually constructed by connecting a plurality of battery modules in series according to the voltage of a load.
In general, battery modules of the same specifications are used, and since they are connected in series, the same charge / discharge current flows and the life and remaining capacity of each battery module should be the same. However, the state of each battery module is actually different due to factors such as a difference in mounting conditions such as an ambient temperature and a variation in a manufacturing process. Therefore, it is conceivable that only a specific battery module is overcharged or overdischarged, or in an extreme case, is charged with the opposite polarity.

In particular, in a moving body such as an electric vehicle equipped with a large-capacity assembled battery, the state of the assembled battery is changed in order to secure a stable running performance at all times and to minimize the above-mentioned problem. You need to constantly monitor it.

FIG. 8 shows an example of a monitoring device for monitoring a battery pack. In the monitoring device, a slave device 6 is provided for each battery module B1 constituting the battery pack B, and a command such as a measurement request is sent from the master device 7 to the slave device 6 via the serial transmission line 8. The measurement result is sent from the slave device 6 to the master device 7 via the serial transmission line 8 in response to the measurement request. The slave device 6 has both terminals B11 and B12 of the battery module B1 as measurement items.
Measuring means 6 for inputting a voltage or the like between the input lines 63 and 64
1 and a communication means 62 for transmitting and receiving measurement results and the like via the serial transmission line 8, and operates by receiving power from the battery module B1. The master device 7 includes a monitoring unit 71 that performs measurement control, calculation of the obtained measurement result, and the like, and a communication unit 72 that transmits a command and receives the measurement result via the serial transmission line 8.

FIG. 9 shows a circuit configuration of communication using the serial transmission line 8. For simplicity, the slave device 6 has two stages. The communication means 62 and 72 are provided between the slave devices 6.
The same configuration is adopted between the slave device 6 and the master device 7, and photocouplers 621 and 721 that can electrically insulate between the slave device 6 and between the slave device 6 and the master device 7 are used for the reception units 62R and 72R, and the transmission unit is used. 62T, 72T
Is a communication line 81 whose signal current forms the serial transmission line 8,
The configuration is such that the photocouplers 621 and 721 are driven via 82. The communication lines 81 and 82 connect the signal current to the ground 65 of the slave device 6 or the master device 7 on the transmitting side.
It has a return line 82 returning to 73.

As described above, in the above-described monitoring apparatus for a battery pack,
There are many wires 63, 64, 81, 82 between the battery module B1 and the slave device 6, between the slave devices 6, and between the slave device 6 and the master device 7. Although not shown, it has a trigger line for ensuring the synchronization of measurement between the slave devices 6 and a switch for turning on and off the power receiving from the battery module B1 of the slave device 6, and has an extremely complicated configuration. .

Therefore, in the battery pack monitoring device described in Japanese Patent Application Laid-Open No. 9-139237, as shown in FIG. 10, a connection midpoint B13 between adjacent battery modules B1 is connected to a voltage monitoring unit by a first shared wiring 94. (Corresponding to the slave device) 91 + input terminal 911 connected to + input terminal 91
1, the positive input of the battery module B1 is used for measurement and power reception, and the + input terminal 911 is connected to the adjacent voltage monitoring unit 91 by the second shared wiring 95.
And the negative input of the battery module B1 is taken from the input terminal 912 for measurement and power reception. As described above, the wiring for drawing out from the negative terminal of the battery module B1 in the preceding stage and the wiring for drawing out from the positive terminal of the battery module B1 in the next stage are also used, so that the battery module B1 and the voltage monitoring unit 91 are connected. Has reduced the number of wires.

[0008]

However, as in the monitoring apparatus described in Japanese Patent Laid-Open No. 9-139237,
Wiring between the battery module and the voltage monitoring unit (the second
Even if the number of dual-purpose wirings can be reduced, the wiring that connects between the voltage monitoring units (the second dual-purpose wiring) ends up being
The number of new increases. After all, it cannot always be said that the configuration is simplified.

The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide an assembled battery monitoring device having a simple configuration.

[0010]

According to the present invention, the slave device is configured to receive power from a corresponding battery module. The serial transmission path is formed in a ring shape from the master device to the slave device and back to the master device. A return line that forms a serial transmission path and returns signal current from the communication means of the slave device on the receiving side to the ground of the slave device on the transmitting side is wired inside the slave device on the receiving side, and the positive side of the slave device on the receiving side Connects to the power receiving unit.

Since the power receiving section of the slave device on the receiving side has the same potential as the ground level on the transmitting side, the signal current flowing through the serial transmission line substantially returns to the ground on the transmitting side. Moreover, since there is no need to wire a return line between slave devices, the number of wires is reduced and the configuration is simplified.

According to the second aspect of the present invention, the serial transmission path is formed in a ring shape sequentially from the master device to the slave device and back to the master device. The slave device is configured to start measuring the voltage between terminals of the battery module after a predetermined waiting time has elapsed after receiving the measurement request from the master device. The waiting time is set based on the reception delay time of the measurement request in each slave device.

[0013] Even if the reception delay time of the measurement request occurs due to the communication delay of the serial transmission line, the measurement of the voltage between the terminals of the battery module is started after the elapse of the waiting time corresponding to the reception delay time. Simultaneous measurement is improved. Since a trigger line for measuring the timing of measurement is not required, the configuration is simplified.

According to the third aspect of the present invention, the master device is
A predetermined command is transmitted to the slave device, a required time until the command circulates around the slave device and is received by the master device is measured, and the waiting time of each slave device is set based on the required time.

Since the required time for defining the reception delay time is automatically obtained by actually transmitting a command, the waiting time according to each monitoring device can be automatically set.

According to the fourth aspect of the present invention, the slave device is configured to receive power from a corresponding battery module.
A connector is interposed between the communication means of the slave device and a communication line which forms a serial transmission path and connects adjacent slave devices. The connector on the slave device side has a terminal connected to the battery module and a terminal connected to the power receiving unit of the slave device, and the connector on the communication line side is provided with a short-circuit portion for short-circuiting both terminals.

When the communication means of the slave device and the communication line are connected by a connector, the slave device receives power from the battery module at the same time. Until this time, the battery module does not discharge more than spontaneous discharge. Such an operation can be performed without using a switch for switching between connection and disconnection between the power receiving unit of the slave device and the battery module, and the configuration is simplified. In addition, since the connection between the slave device and the serial transmission line and the connection between the slave device and the battery module are performed simultaneously, the work of assembling the monitoring device is easy.

[0018]

(First Embodiment) FIG. 1 shows a first embodiment of a monitoring device for a battery pack according to the present invention. The assembled battery B is configured by connecting a plurality of battery modules B1 in series,
A monitoring device M is attached to this. In the monitoring device M, a slave device 1 is provided for each battery module B1, and a command such as a measurement request is sent to the slave device 1 from the master device 2 via the serial transmission path 3. The measurement result is sent from the slave device 1 to the master device 2 via the serial transmission line 3 in response to the measurement request.

The slave device 1 is in a state of the battery module B1 such as a voltage between the two terminals B11 and B12 of the battery module B1, which are measurement items, and a temperature detection signal from a temperature sensor (not shown) attached to the battery module B1. A measuring unit 11 which is a measuring unit to which a signal for detecting
The communication unit 12 is a communication unit that transmits and receives measurement results and the like via the serial transmission path 3. Battery module B
The input lines 13 and 14 for inputting the voltage between both terminals B11 and B12 to the measuring unit 11 are also power supply lines,
The measuring unit 11 and the communication unit 12 operate by receiving power from the battery module B1. The master device 2 includes a monitoring unit 21 configured by a microcomputer or the like that performs measurement control and calculation of the obtained measurement result, and a communication unit 22 that transmits a command and receives the measurement result via the serial transmission line 3. It consists of.

The serial transmission line 3 passes from the master device 2 to the first slave device 1, sequentially to the next slave device 1, and from the last slave device 1 to the master device 2.
The command such as a measurement request output from the master device 2 circulates around the slave device 1 and returns to the master device 2 again. In addition, the result measured by each slave device 1 in response to the measurement request is sequentially transferred to the next-stage slave device 1 and transmitted from the last-stage slave device 1 to the master device 2.

FIG. 2 shows a circuit configuration of communication using the serial transmission line 3. For simplicity, the battery module B1 has a two-stage configuration, and therefore, the slave device 1 has a two-stage configuration. The communication unit 12 of the slave device 1 and the communication unit 22 of the master device 2 have the same configuration.
Photocouplers 121 and 221 that can electrically insulate between the slave device 1 and between the slave device 1 and the master device 2 are used for the 22R. The photocouplers 121 and 221 are configured to be driven via the communication lines 31 and 32 or the communication lines 31 and 33.

Next, communication lines 31 to 33 connecting between these communication units 12 and 22 will be described. The communication line 31 is a wiring connecting between the current limiting resistor 122 or 222 and the anode of the diode of the photocoupler 121 or between the current limiting resistor 122 and the anode of the diode of the photocoupler 221. And a wire harness crawling between the master device 2 and the like.

The communication lines 32 and 33 are return lines, and one end of the return line 32 for communication between the slave device 1 and the master device 2 is connected to the photocoupler 121 of the foremost slave device 1 or the photocoupler 221 of the master device 2. One end of the return line 33 for communication between the slave devices 1 is connected to the cathode of the photocoupler 121 of the slave device 1.
And take a different configuration.

That is, the return line 32 is connected to the communication line 31
And a wire harness or the like crawling between the slave device 1 and the master device 2, and the signal current transmitted from the communication unit 22 of the master device 2 on the transmission side is changed by the return line 32. The communication unit 12 returns to the ground 23 of the master device 2.
In addition, the signal current transmitted from the communication unit 12 of the last slave device 1 on the transmission side returns to the ground 15 of the last slave device 1 from the communication unit 22 of the master device 2 on the reception side. .

On the other hand, the return line 33 is wired inside the slave device 1 on the receiving side, and the input line 13 of the slave device 1 is connected.
It is connected to the power receiving unit 16 on the positive electrode side that is electrically connected to the power receiving unit 16. For example, it is wired as a wiring pattern on an electronic board on which the measuring unit 11 and the communication unit 12 are mounted.

Now, since each slave device 1 is operated by the corresponding battery module B1, the potential of the ground 15 of each slave device 1 is equal to the potential of the negative terminal B12 of the corresponding battery module B1. Then, the negative electrode terminal B12 of each battery module B1 and the battery module B of the next stage
Since the first positive terminal B11 is conductive, the potential of the negative terminal B12 of each battery module B1 is the positive terminal B11 potential of the next-stage battery module B1.

The return line 33 for communication between the slave devices 1 is connected to the positive power receiving portion 16 of the slave device 1 on the receiving side to the positive terminal B11 of the corresponding battery module B1.
The signal current sent from the communication unit 12 of the slave device 1 on the transmitting side is connected to the ground 15 of the slave device 1 on the transmitting side via the negative terminal B12 of the battery module B1 on the preceding stage. The signal is returned to the ground 15 of the slave device 1 on the transmitting side from the communication unit 12 of the slave device 1 on the receiving side via the return line 33 and the path.

Since the return line 33 does not depend on a wire harness or the like crawling between the slave devices 1, the number of communication lines constituting the serial transmission line 3 can be reduced by about half, and the configuration of the monitoring device can be simplified. Can be.

Next, the slave device 1 will be described in detail. FIG. 3 shows an algorithm executed in the slave device 1.

The slave device 1 waits for reception of a measurement request from the master device 2 (step S101), and upon receiving the measurement request, transmits the measurement request to the next-stage slave device 1 (step S102). In the following step S103, the process waits for the elapse of a waiting time described later set for each slave device 1. The slave device 1 has n stages, and the waiting time of the first (first) slave device 1 is TW (1),
The waiting time of the second-stage slave device 1 is represented by TW (2),.
The waiting time of the slave device 1 at the (n-1) th stage is TW
(N-1), the waiting time of the last (n-th) slave device 1 is represented by TW (n) (the same applies hereinafter). When the waiting time TW (i) (i = 1 to n, the same applies hereinafter) elapses, the terminals B11 and B1 of the corresponding battery module B1.
Various quantities such as voltage and temperature between the two are measured (step S10).
4).

Next, the process waits for reception of a transmission request from the master device 2 (step S105).
It transmits its own measured value to the next-stage slave device 1 (step S106), and then sends a transmission request to the next-stage slave device 1.
(Step S107).

Although not shown, each slave device 1 unconditionally receives the measurement value from the preceding slave device 1 and unconditionally sends the measured value to the next slave device 1 (the last slave device 1 is the master device 2). ). In this way, the measured values are sent to the master device 1 in order from the foremost slave device 1. Therefore, the master device 2 can determine from which slave device 1, that is, which battery module B1 the measured values are from the order in which they were sent. Therefore, it is not always necessary to assign an ID to the slave device 1. Of course, an ID is assigned to each slave device 1 and each slave device 1 writes its own ID in the header when transmitting the measured value, so that the master device 2 determines from which slave device 1 the measured value is based on the ID. May be determined.

When the transmission operation of all the slave devices 1 ends normally, the master device 2 receives the transmission request from the last slave device 1 after receiving all the measured values. The end of a series of transmission operations can be determined.

Next, in order to clarify the characteristics of the monitoring device M, the algorithm of the slave device of the conventional monitoring device is shown in FIG.
This will be described below. For the common procedure, the same number as that of the monitoring device is used. The conventional monitoring device is significantly different in that a waiting time (step S103 in FIG. 3) until the measurement is not provided. Therefore, there are the following problems. That is, as shown in FIG. 12, when a command is transferred from the master device, a communication delay time t occurs, and the communication delay time t is added to the slave device in the later stage, and the reception delay time of the measurement request in each slave device becomes longer. . If the measurement (step S104) is performed immediately after the reception of the measurement request, the measurement time will be shifted between the slave devices, and the synchronization of the measurement cannot be ensured. Ideally, the measurement should be started all at once immediately after the last slave device receives the measurement request, but for that purpose, a dedicated trigger signal line for synchronizing between the slave devices is required, The wiring becomes complicated.

On the other hand, the monitoring apparatus M adopts the above-mentioned algorithm (FIG. 3), and after receiving the measurement request,
Measurement is performed after a predetermined waiting time has elapsed (step S1).
03, S104). The waiting time TW (i) is obtained, for example, in advance by calculating the reception delay time of each slave device 1 based on the measurement request reception timing of the first slave device 1, and setting the waiting time of each slave device 1 to the first stage. The setting is made to be shorter than the waiting time of the slave device 1 by the reception delay time of each slave device 1. This allows
As shown in FIG. 4, the measurement start times of all the slave devices 1 can be made coincident, and the synchronization of the measurements can be obtained.
Since no means for synchronization such as the trigger signal line is used, the configuration is simple. By setting the wait time of the last-stage slave device 1 to 0, the measurement start time is set to the ideal measurement start time at which the measurement is performed immediately after the last-stage slave device 1 receives the measurement request. Become.

(Second Embodiment) This embodiment is different from the monitoring device of the first embodiment shown in FIGS. 1 and 2 in that the algorithm of the master device 2 is partially different.
FIG. 5 shows the algorithm of the master device 2. In addition,
In the following description, portions that operate substantially the same as in the first embodiment will be assigned the same reference numerals as those in the first embodiment, and differences from the first embodiment will be mainly described.

After resetting the time measurement timer (step S201), the master device 2 transmits a command for requesting measurement of the waiting time TW (i) to the foremost slave device 1 via the serial transmission line 3 (step S202). . The measurement request of the waiting time TW (i) is sequentially transferred to the slave device 1 at the subsequent stage. During this time, the master device 2 waits for reception of the time measurement request (step S203). When the waiting time measurement request is transferred from the last slave device 1 to the master device 2, the process proceeds to step S <b> 204, and the time measurement request is transmitted from the time measurement timer to the slave device 1. It sequentially travels, and measures a required time (hereinafter, traveling time) T until a time measurement request is received from the slave device 1 at the last stage.

In the following step S205, step S2
Each slave device 1 based on the traveling time T measured at 04
The waiting time TW (i) is calculated. The calculation is performed as follows. There is no great difference in the communication delay time t between any adjacent slave devices 1 or between the slave device 1 and the master device 2. Therefore, the number of communications between the slave devices 1 and between the slave device 1 and the master device 2 (hereinafter, the number of cyclic communications) is performed until the command transmitted from the master device 2 circulates around the slave device 1 and returns to the master device 2 again. ) Is (the number of slave devices 1 +1), so that the communication delay time t is calculated by dividing the traveling time T by (the number of slave devices 1 +1).

The waiting time TW (i) is t × (n−1) for the foremost slave device (first stage) 1, t × (ni) for the i-th slave device 1,. .., (n-1)
The slave device 1 at the stage is set to t × 1, and the slave device 1 at the last stage (n-th stage) is set to 0. Next, the waiting time TW (i) of each slave device 1 is transmitted (step S206).

Each slave device 1 stores its own waiting time T W (i), and upon receiving a measurement request, measures the corresponding battery module B1 after the elapse of the waiting time T W (i).

In this embodiment, the individual monitoring devices M are measured by actually measuring the traveling time T that defines the communication delay time t.
Since the waiting time TW (i) of the slave device 1 can be obtained every time, extremely accurate measurement synchronization can be obtained. In addition, since the setting of the waiting time TW (i) is automatically performed, the waiting time TW (i)
It is easy to replace the slave device 1 that needs to be reset.

As a modification of this embodiment, the slave device 1 and the master device 2 may be configured as follows.
That is, the master device 2 calculates and transmits the waiting time TW (i) of each slave device 1 (step S205,
Instead of S206), a communication delay time t obtained by dividing the cyclic time T measured in step S204 by the cyclic communication count (the number of slave apparatuses 1 + 1) is transmitted to the slave apparatus 1.

Then, the slave device 1 receiving this is configured as follows. FIG. 6 shows an algorithm of the slave device 1. Wait for the time measurement request (step S
301), upon receipt, a time measurement request is transmitted to the next slave device 1 (step S302), and the communication delay time t
The process waits (step S303). During this time, a time measurement request is transmitted from the last slave device 1 to the master device 2, the communication delay time t is calculated in the master device 2, and transmitted to the first slave device 1. Communication delay time t
Are sequentially transferred from the first-stage slave device 1 to the second-stage slave device 1.

When the slave device 1 receives the communication delay time t (step S303), its own waiting time TW
(I) is calculated (step S304) and set (step S305). The calculation of the waiting time TW (i) is performed as in step S205.

In this configuration, since the calculation load on the master device 2 is reduced, the waiting time T W
The time required until (i) is set can be shortened.

The number (ni) (the number of waiting times set) multiplied by t of each slave device 1 depends on the physical connection state of the slave device 1 (how many stages n of the slave device 1 are). , The number of the slave device 1), and after the physical connection state is determined, for example, by a hardware means such as a dip switch provided in each slave device 1. It may be set and known, or alternatively, it can be set as follows.

That is, when the master device 2 transmits the communication delay time t to the foremost slave device 1, the master device 2 also transmits the number (n−1) obtained by subtracting 1 from the number of stages n of the slave device 1, In the slave device 1, the number obtained by further subtracting 1 from the received number is stored as its own waiting time setting number, and the slave device 1 in the next stage communicates with the communication delay time t.
When you send together. In such a configuration, the set number of waiting times is automatically determined as n-1, n-2,..., 2, 1, 0 sequentially from the slave device 1 at the front end. In this configuration, the ID of the slave device 1 can be automatically set by setting the assigned waiting time set number as the ID.

(Third Embodiment) FIG. 7 shows a third embodiment of the battery pack monitoring apparatus of the present invention. The basic configuration is the same as the monitoring device of the first embodiment shown in FIGS.
In the following description, portions that operate substantially the same as in the first embodiment will be assigned the same reference numerals as those in the first embodiment, and differences from the first embodiment will be mainly described.

The communication line 31 of the serial transmission line 3 and the slave device 1 are connected via mating connectors 4U and 4W. The connectors 4U and 4W are provided with terminals 41U, 42U, 43U and 44U, and terminals 41W, 42W, 43W and 44W, respectively.
W, terminal 42U and terminal 42W, terminal 43U and terminal 43
W, the terminal 44U and the terminal 44W are in elastic contact with each other to conduct.
Terminals 41U to 44U, 41W of each connector 4U, 4W
44W has two for communication and two for power reception. The example shown is for the slave device 1 excluding the first and last stages.
In the case of the first and last slave devices 1 connected to the master device 2, the number of communication terminals is increased by the amount of the return line 32.

A connector 4U of the slave device 1 (hereinafter referred to as a unit-side connector) has a first communication terminal 41U connected to the receiving circuit 12R of the communication section 12 via a drop-in line 17, and a second communication terminal. 42U is connected to the transmission circuit 12T of the communication unit 12 by the drop line 18.

In the slave device 1, the input line 13 for inputting the voltage between the terminals B 11 and B 12 of the battery module B 1 to the measuring unit 11 is divided on the way, and the battery of the divided input lines 131 and 132 is The divided end of the input line 131 communicating with the module B1 is connected to the first power receiving terminal 43U of the unit-side connector 4U. The divided end of the input line 132 communicating with the measuring unit 11 is connected to the second power receiving terminal 44U of the unit-side connector 4U.

On the other hand, the first communication terminal 41W of the connector (hereinafter referred to as a wire connector) 4W on the communication line 31 is connected to the second communication terminal 42W of the wire connector 4W corresponding to the slave device 1 in the preceding stage. They are connected by a communication line 31. The second communication terminal 42W is connected to the first communication terminal 41W of the wire-side connector 4W corresponding to the slave device 1 at the next stage via the communication line 31.

The first and second wire-side connectors 4W
The power receiving terminals 43W and 44W are electrically connected to each other by a short-circuit ring 45 serving as a short-circuit portion.

With this configuration, the monitoring device M is disconnected from the battery module B1 and the slave device 1 until the monitoring device M is mounted on the system in which the monitoring device M and the battery pack B are mounted (the state shown in the drawing). Power is not supplied to the measurement unit 11 or the communication unit 12. And a communication line 31 by connectors 4U and 4W.
The input line 131 and the input line 132 become conductive for the first time when the slave device 1 is connected to the power supply, and power is supplied to the slave device 1. That is, the battery module B until the time of the above assembly
1 is reliably prevented.

In a battery pack monitoring device, especially in a device in which a slave device is mounted on and integrated with a battery pack at a production stage, it is necessary to prevent the battery module from being discharged by energization from the battery module to a measuring unit or the like. . For those with a microcomputer in the measuring unit, there is a method such as operating the microcomputer in sleep mode, but still some dark current is unavoidable, and after mounting the slave device on the assembled battery and integrating it at the production stage When the battery module is stored in a warehouse or the like, the dark current may be accumulated and the battery module may be overdischarged. For this reason, in order to reliably prevent the battery module from discharging, conventionally, a switch for turning on / off the power supply from the battery module is separately required.

The monitoring device M of the present invention according to this embodiment is
Compared with such a conventional device, the input line 131 and the input line 132 are simultaneously connected when the communication line 31 and the slave device 1 are connected by the connectors 4U and 4W, which are indispensable work during assembly.
Are conducted, so that there is no need to provide a switch, and the configuration is simplified. In addition, since no switch operation is required, workability is good.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first assembled battery monitoring apparatus of the present invention.

FIG. 2 is another configuration diagram illustrating a first assembled battery monitoring apparatus of the present invention.

FIG. 3 is a flowchart showing an algorithm in a slave device of the first battery pack monitoring device of the present invention.

FIG. 4 is a time chart showing the operation of the first assembled battery monitoring apparatus of the present invention.

FIG. 5 is a flowchart showing an algorithm in a master device of a modified example of the first assembled battery monitoring device of the present invention.

FIG. 6 is a flowchart illustrating an algorithm in a slave device of another modified example of the first assembled battery monitoring device of the present invention.

FIG. 7 is a configuration diagram showing a second assembled battery monitoring apparatus of the present invention.

FIG. 8 is a configuration diagram showing a conventional battery pack monitoring device.

FIG. 9 is another configuration diagram showing a conventional battery pack monitoring device.

FIG. 10 is a configuration diagram showing another conventional battery pack monitoring device.

FIG. 11 is a flowchart showing an algorithm of a conventional battery pack monitoring apparatus.

FIG. 12 is a time chart showing the operation of the conventional battery pack monitoring apparatus.

[Explanation of symbols]

 B Battery pack B1 Battery module B11 Positive terminal B12 Negative terminal M Monitoring device 1 Slave device 11 Measuring unit (measuring unit) 12 Communication unit (communication unit) 16 Power receiving unit 2 Master device 3 Serial transmission path 31 Communication line 33 Return line 4U, 4W connector 43U, 44U, 43W, 44W Power receiving terminal (terminal) 45 Short-circuit ring (short-circuit part)

Continuation of the front page (72) Inventor Susumu Ukita 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F-term (reference) 2G016 CA03 CB11 CB12 CB31 CC01 CC10 CC12 CC14 5G003 AA07 BA03 CA11 DA07 DA13 DA17 EA09 FA06 GA10 GC05 5G015 FA10 JA19 JA34 JA56 KA12 5H030 AA08 AS06 AS08 FF44 FF51 FF52

Claims (4)

[Claims] 1. A monitoring device for a battery pack comprising a plurality of battery modules connected in series, comprising: a measuring unit provided for each battery module for measuring a voltage between terminals of the battery module; and a serial transmission line. A slave device including communication means for transmitting and receiving the measurement result by the measurement means,
In a battery pack monitoring device including a master device that receives measurement results of a slave device, the slave device is configured to receive power from a corresponding battery module, and a serial transmission path is sequentially passed from the master device to the master device through the slave device. A return line formed in a ring shape returning to the device, forming a serial transmission path, and returning a signal current from the communication means of the slave device on the receiving side to the ground of the slave device on the transmitting side is wired in the slave device on the receiving side. A monitoring device for an assembled battery, wherein the monitoring device is connected to a power receiving unit on a positive electrode side of a slave device on a receiving side. 2. A monitoring apparatus for a battery pack comprising a plurality of battery modules connected in series, comprising: a measuring unit provided for each battery module, for measuring a voltage between terminals of the battery module, and a serial transmission path. A slave device including communication means for transmitting and receiving the measurement result by the measurement means,
In a monitoring apparatus for a battery pack, comprising: a master device for receiving a measurement result of the slave device; and a serial transmission line formed in a ring shape from the master device to the master device through the slave device sequentially. It is configured to start measuring the voltage between terminals of the battery module after a predetermined waiting time has elapsed after receiving the measurement request from the device, and the waiting time is set based on the reception delay time of the measurement request in each slave device. A monitoring device for a battery pack, comprising: 3. The battery pack monitoring apparatus according to claim 2, wherein the master device transmits a predetermined command to the slave device, and determines a time required for the command to circulate through the slave device and be received by the master device. An assembled battery monitoring device that measures and sets the waiting time of each slave device based on the required time. 4. A monitoring device for an assembled battery comprising a plurality of battery modules connected in series, wherein the monitoring device is provided for each battery module and measures a voltage between terminals of the battery module, and a serial transmission path. A slave device including communication means for transmitting and receiving the measurement result by the measurement means,
In a battery pack monitoring device including a master device that receives a measurement result of a slave device, the slave device is configured to receive power from a corresponding battery module, and a communication unit of the slave device and a serial transmission path are configured. A connector is provided between communication lines connecting between adjacent slave devices, and a connector on the slave device side is provided with a terminal communicating with the battery module and a terminal communicating with the power receiving unit of the slave device. Wherein a short-circuit portion for short-circuiting both terminals is provided.