JP5713094B2 - Battery monitoring device - Google Patents

Description

  The present invention relates to a technique for monitoring the state of each of a plurality of batteries.

  In recent years, some batteries mounted on a vehicle such as an electric forklift, a hybrid vehicle, or an electric vehicle have a plurality of batteries connected in parallel in order to stably supply large electric power to a load.

  Some battery monitoring devices that monitor the state of each battery include a control unit that permits charging / discharging of each battery according to the monitoring result of each battery. In such a battery monitoring device, the control unit needs identification information individually assigned to each monitoring unit in order to obtain monitoring results from a plurality of monitoring units that monitor the respective states of each battery.

In addition, when a communication abnormality such as disconnection of a communication line connecting the monitoring unit and the control unit or a connection failure between the communication connectors occurs, the monitoring unit and the control unit cannot communicate with each other.
Thus, for example, there is a technique for identifying a location where a communication abnormality occurs based on the presence or absence of communication performed between a monitoring unit and a control unit within a fixed time (see, for example, Patent Document 1).

JP 2012-86601 A

  However, when each monitoring unit and control unit are connected in series, so-called daisy chain connection, all monitoring units are not directly connected to the control unit, so the location of occurrence of communication abnormality in the control unit It may not be possible to identify.

  Therefore, the present invention provides a communication abnormality occurrence point in the control unit even when each monitoring unit that monitors the state of each battery connected in parallel and a control unit that communicates with each monitoring unit are connected in series. It is an object of the present invention to provide a battery monitoring device that can specify

  The battery monitoring apparatus of the present invention is connected in series with each other, and a plurality of monitoring units that monitor the state of the battery, and a plurality of monitoring units that are connected in series with identification information assigned to each of the plurality of monitoring units. A control unit communicating with the monitoring unit.

  Each of the plurality of monitoring units assigns identification information corresponding to the setting signal output from the preceding control unit or monitoring unit as its own identification information, and changes the setting signal to output to the subsequent monitoring unit or control unit To do.

The control unit identifies the location where the communication abnormality has occurred according to the amount of change in the setting signal output from the last monitoring unit.
Since the number of monitoring units that can change the setting signal varies depending on the location where the communication abnormality occurs, the setting signal output from the last monitoring unit varies depending on the location where the communication abnormality occurs. Therefore, the control unit can identify the location where the communication abnormality has occurred according to the amount of change in the setting signal output from the last monitoring unit.

  The battery monitoring device of the present invention is connected in series with each other, using a plurality of monitoring units that monitor the state of the battery, and identification information that is connected in series with the plurality of monitoring units and assigned to the plurality of monitoring units, respectively. A control unit that communicates with a plurality of monitoring units.

Each of the plurality of monitoring units changes the setting signal output from the preceding control unit or monitoring unit and outputs the changed setting signal to the subsequent monitoring unit or control unit.
The control unit recognizes the number of battery modules including the monitoring unit or the monitoring unit according to the setting signal output from the last monitoring unit.

  According to the present invention, even if each monitoring unit that monitors the state of each battery connected in parallel and the control unit that communicates with each monitoring unit are connected in series, the location where the communication abnormality occurs in the control unit Can be specified.

It is a figure which shows the battery monitoring apparatus of embodiment. It is a flowchart which shows operation | movement of a monitoring part. It is a flowchart which shows operation | movement of the control part at the time of initialization. It is a flowchart which shows operation | movement of the control part for every fixed time progress after initialization. It is a figure which shows an example of the information memorize | stored in a memory | storage part. It is a figure which shows an example of the information memorize | stored in a memory | storage part. It is a figure which shows an example of the information memorize | stored in a memory | storage part.

FIG. 1 is a diagram illustrating a battery monitoring apparatus according to an embodiment.
The battery monitoring device 1 shown in FIG. 1 includes five battery modules 2 (2-1 to 2-5), a control unit (battery ECU (Electronic Control Unit)) 3, and a main relay 4. The battery monitoring device 1 is mounted on a vehicle such as an electric forklift, a hybrid vehicle, or an electric vehicle. Further, the number of battery modules 2 is not limited to five.

  Each of the battery modules 2-1 to 2-5 includes a battery 5, a relay 6, a voltage detection unit 7, a current detection unit 8, a temperature detection unit 9, and a monitoring unit (monitoring ECU) 10. . Each battery 5 is connected in parallel to each other and supplies power to the load 11.

The battery 5 is a rechargeable battery, for example, a lithium ion secondary battery or a nickel metal hydride battery. The battery 5 may be composed of a plurality of batteries connected in series.
The relay 6 is provided between the main relay 4 and the battery 5. When the relay 6 is turned on and the main relay 4 is turned on, power can be supplied from the battery 5 to the load 11.

The voltage detection unit 7 detects the voltage of the battery 5 and is, for example, a voltmeter.
The current detection unit 8 detects a current flowing to the battery 5 during charging and a current flowing from the battery 5 during discharging, and is an ammeter, for example.

The temperature detection unit 9 detects the ambient temperature of the battery 5 and is, for example, a thermistor.
The monitoring unit 10 includes a relay control unit 12, a storage unit 13, an identification information setting unit 14, and a communication unit 15. The relay control unit 12, the identification information setting unit 14, and the communication unit 15 include, for example, a CPU (Central Processing Unit), a multi-core CPU, a programmable device (FPGA (Field Programmable Gate Array), a PLD (Programmable Logic Device), and the like. ) And the like and realized by the CPU, multi-core CPU, or programmable device reading and executing the program stored in the storage unit 13. Moreover, each communication part 15 of the battery modules 2-1 to 2-5 and the communication part 19 of the control part 3 are connected in series in a ring shape. That is, the communication units 15 of the battery modules 2-1 to 2-5 and the communication unit 19 of the control unit 3 are daisy chain connected.

The relay control unit 12 controls on / off of the relay 6.
The storage unit 13 is, for example, a ROM (Read Only Memory) or a RAM (Random Access Memory), and stores various information and various programs.

  The identification information setting unit 14 sets its own identification information and causes the storage unit 13 to store the identification information. For example, when five pieces of identification information “101”, “102”, “103”, “104”, and “105” are assigned to the battery modules 2-1 to 2-5, the first battery module 2- The first identification information setting unit 14 stores “101” in the allocation storage unit 13 as its own identification information. Further, the identification information setting unit 14 of the battery module 2-2 arranged at the subsequent stage of the battery module 2-1 stores “102” in the allocation storage unit 13 as its own identification information. Further, the identification information setting unit 14 of the battery module 2-3 arranged at the subsequent stage of the battery module 2-2 stores “103” in the allocation storage unit 13 as its own identification information. Further, the identification information setting unit 14 of the battery module 2-4 arranged at the subsequent stage of the battery module 2-3 stores “104” in the allocation storage unit 13 as its own identification information. Further, the identification information setting unit 14 of the last battery module 2-5 arranged at the subsequent stage of the battery module 2-4 stores “105” in the allocation storage unit 13 as its own identification information.

  The communication unit 15 inputs (receives) a setting signal output (transmitted) from the front-stage control unit 3 or the front-stage monitoring unit 10 via the communication line, or the rear-stage monitoring unit 10 or the rear-stage control unit 3. To output (send) the setting signal.

  The control unit 3 communicates with a relay control unit 16 that controls on / off of the main relay 4, a storage unit 17, a communication abnormality location specifying unit 18, and each monitoring unit 10 of the battery modules 2-1 to 2-5. The communication part 19 which performs is provided. The storage unit 17 is, for example, a ROM or a RAM, and stores various information and various programs. Further, the relay control unit 16, the communication abnormality location specifying unit 18, and the communication unit 19 are configured by, for example, a CPU, a multi-core CPU, a programmable device (FPGA, PLD, etc.), and the like, and are stored in the storage unit 17. Is realized by a CPU, a multi-core CPU, or a programmable device that reads and executes the program. In addition, the control unit 3 receives the identification information transmitted from the battery modules 2-1 to 2-5 by the communication unit 19 and stores the identification information in the storage unit 17. Moreover, the control part 3 uses the identification information memorize | stored in the memory | storage part 17, and the state (for example, the voltage of the battery 5, an electric current, and temperature) transmitted from the battery modules 2-1 to 2-5, respectively. Etc.) is received by the communication unit 19. In addition, when the state of the battery 5 indicated by the received information is in a predetermined state (for example, when at least one of the voltage, current, and temperature of the battery 5 is greater than the threshold value), the control unit 3 It is determined that the state of at least one of the batteries 5 in the modules 2-1 to 2-5 is abnormal, and the vehicle is in the evacuation mode (for example, after the vehicle is gradually decelerated until a certain time has elapsed). An instruction to stop is sent to the host control unit that controls the running of the vehicle, and the process proceeds to a process of turning off the main relay 4 by the relay control unit 16 after a predetermined time has elapsed. Further, when the control unit 3 determines that a communication abnormality has occurred, the control unit 3 shifts to the save travel mode.

  When the communication lines connecting the communication units 15 of the battery modules 2-1 to 2-5 and the communication unit 19 of the control unit 3 are not used in the identification information setting process, the control unit indicates the location where the communication abnormality has occurred. Used to communicate to 3.

  FIG. 2 is a flowchart showing the operation of each monitoring unit 10 of the battery modules 2-1 to 2-5. In addition, each monitoring part 10 shall perform the operation | movement shown in FIG. 2 for every setting monitoring timing, respectively. The setting monitoring timing is set, for example, at the time when the identification information is initially set or at every elapse of a fixed time after the identification information is initially set. The initial setting of the identification information is executed, for example, when a communication line is connected to the communication connector of its own communication unit 15 by replacing or exchanging the battery module 2.

First, the identification information setting unit 14 of the monitoring unit 10 sets the identification information corresponding to the setting signal input from the previous control unit 3 or the previous monitoring unit 10 as its own identification information (S21).
Next, the identification information setting unit 14 changes the input setting signal and outputs it to the subsequent monitoring unit 10 or the subsequent control unit 3 (S22).

  Then, the identification information setting unit 14 transmits its own identification information to the control unit 3 (S23), and ends the identification information setting process. The communication line used when transmitting the identification information to the control unit 3 may be different from the communication line used when setting the identification information.

FIG. 3 is a flowchart showing the operation of the control unit 3 at the initial setting of identification information.
First, the communication abnormality point identification part 18 of the control part 3 outputs a setting signal to the monitoring part 10 of the head battery module 2-1 (S31).

  Next, the communication abnormality point specifying unit 18 stores the number of battery modules 2 corresponding to the input setting signal (the setting signal output from the monitoring unit 10 of the last battery module 2-5) in the storage unit 17. (S32).

  And the communication abnormal location specific | specification part 18 receives the identification information each transmitted from the battery modules 2-1 to 2-5, and memorize | stores those received identification information in the memory | storage part 17 (S33).

FIG. 4 is a flowchart showing the operation of the control unit 3 every elapse of a fixed time after the initial setting of the identification information.
First, when the communication abnormality point specifying unit 18 of the control unit 3 determines that the input setting signal (the setting signal output from the monitoring unit 10 of the last battery module 2-5) has changed (S41: YES). In accordance with the amount of change in the setting signal, the location where the communication abnormality has occurred is specified (S42).

And the communication abnormality location specific | specification part 18 notifies the generation | occurrence | production location of the specified communication abnormality to a high-order control part (S43).
Thus, according to the battery monitoring apparatus 1 of this embodiment, in each monitoring part 10 of the battery modules 2-1 to 2-5, the setting output from the preceding control part 3 or the preceding monitoring part 10, respectively. The signal is changed and output to the subsequent monitoring unit 10 or the subsequent control unit 3, and in the control unit 3, a communication abnormality occurs according to the amount of change in the setting signal output from the last monitoring unit 10. The location is specified. Since the number of monitoring units 10 that can change the setting signal varies depending on the location where the communication abnormality occurs, the setting signal output from the last monitoring unit 10 varies depending on the location where the communication abnormality occurs. Therefore, the control unit 3 can identify the location where the communication abnormality has occurred according to the amount of change in the setting signal output from the last monitoring unit. That is, according to the battery monitoring device 1 of the present embodiment, even if each monitoring unit 10 and the control unit 3 of the battery modules 2-1 to 2-5 are connected in series, the control unit 3 can detect a location where a communication abnormality has occurred. Can be identified.
<Example 1>
The identification information setting unit 14 of each monitoring unit 10 changes the duty ratio of the rectangular wave as the input setting signal (the setting signal output from the preceding control unit 3 or the preceding monitoring unit 10) by + 10%. Then, the setting signal with the duty ratio changed is output to the subsequent monitoring unit 10 or the subsequent control unit 3. For example, referring to the information shown in FIG. 5A, the identification information setting unit 14 outputs a setting signal with a duty ratio of 20% when the duty ratio of the input setting signal is 10%. When the setting signal duty ratio is 20%, a setting signal with a duty ratio of 30% is output. When the input setting signal duty ratio is 30%, a setting signal with a duty ratio of 40% is output. When the duty ratio of the input setting signal is 40%, a setting signal with a duty ratio of 50% is output. When the duty ratio of the input setting signal is 50%, a setting signal with a duty ratio of 60% is output. To do.

  In addition, the identification information setting unit 14 of each monitoring unit 10 has a duty ratio of 0% or 100% of the input setting signal (the setting signal output from the previous control unit 3 or the previous monitoring unit 10), respectively. Then, a setting signal having the same duty ratio as the setting signal output from the head monitoring unit 10 is output to the subsequent monitoring unit 10. For example, with reference to the information shown in FIG. 5A, the identification information setting unit 14 outputs a setting signal with a duty ratio of 20% when the duty ratio of the input setting signal is 0% or 100%. To do. When the duty ratio is 0% or 100% is when the input setting signal is not a rectangular wave. That is, this is when the signal is always High or Low. When the duty ratio of the input setting signal is 100%, the identification information setting unit 14 or the abnormal communication location specifying unit 18 processes the duty ratio of the input setting signal as 0%. Also in the following embodiments, when the duty ratio of the input setting signal is 100%, the same processing as when the duty ratio is 0% is performed, and thus the description thereof is omitted.

  The communication abnormality location identifying unit 18 of the control unit 3 identifies the location where the communication abnormality has occurred according to the amount of change in the duty ratio of the input setting signal (the setting signal output from the last monitoring unit 10). For example, referring to the information shown in FIG. 6A, the communication abnormality point identifying unit 18 changes the duty ratio of the input setting signal (for example, after the fixed time has elapsed with the input setting signal duty ratio). When the input setting signal duty ratio) is −10%, “between battery modules 2-1 and 2-2” is specified as the location of the communication abnormality, and the input setting signal duty is When the ratio change amount is −20%, “between battery modules 2-2 and 2-3” is specified as the location where the communication abnormality occurs, and the duty ratio change amount of the input setting signal is −30% When “between battery modules 2-3 and 2-4” is specified as the location of occurrence of communication abnormality, and the amount of change in the duty ratio of the input setting signal is −40%, Battery modules 2-4, 2-5 Identify between "the amount of change in the duty ratio setting signal is input when the -60%, specifies" between the battery modules 2-5 and the control unit 3 'as a generation part of the communication abnormality.

The operation of each monitoring unit 10 and control unit 3 of the battery modules 2-1 to 2-5 at the initial setting of identification information will be described.
First, the communication abnormality point specifying unit 18 of the control unit 3 outputs a setting signal having a duty ratio of 10% to the monitoring unit 10 of the first battery module 2-1.

  Next, when the monitoring unit 10 of the battery module 2-1 determines that “the duty ratio of the input setting signal” is “10%” with reference to the information illustrated in FIG. “101” is acquired as “identification information” corresponding to “10%”, and the acquired “101” is stored in the storage unit 13 as its own identification information. The monitoring unit 10 of the battery module 2-1 acquires “20%” as the “duty ratio of the setting signal to be output” corresponding to “10%” with reference to the information illustrated in FIG. Then, the acquired setting signal of the duty ratio of “20%” is output to the monitoring unit 10 of the battery module 2-2 at the subsequent stage.

  Next, when the monitoring unit 10 of the battery module 2-2 determines that the “duty ratio of the input setting signal” is “20%” with reference to the information illustrated in FIG. “102” is acquired as “identification information” corresponding to “20%”, and the acquired “102” is stored in the storage unit 13 as its own identification information. The monitoring unit 10 of the battery module 2-2 acquires “30%” as the “duty ratio of the setting signal to be output” corresponding to “20%” with reference to the information illustrated in FIG. Then, the obtained setting signal of the duty ratio of “30%” is output to the monitoring unit 10 of the battery module 2-3 at the subsequent stage.

  Next, when the monitoring unit 10 of the battery module 2-3 determines that the “duty ratio of the input setting signal” is “30%” with reference to the information illustrated in FIG. “103” is acquired as “identification information” corresponding to “30%”, and the acquired “103” is stored in the storage unit 13 as its own identification information. The monitoring unit 10 of the battery module 2-3 acquires “40%” as the “duty ratio of the setting signal to be output” corresponding to “30%” with reference to the information illustrated in FIG. The acquired “40%” duty ratio setting signal is output to the monitoring unit 10 of the battery module 2-4 at the subsequent stage.

  Next, when the monitoring unit 10 of the battery module 2-4 determines that the “duty ratio of the input setting signal” is “40%” with reference to the information illustrated in FIG. “104” is acquired as “identification information” corresponding to “40%”, and the acquired “104” is stored in the storage unit 13 as its own identification information. The monitoring unit 10 of the battery module 2-4 acquires “50%” as the “duty ratio of the setting signal to be output” corresponding to “40%” with reference to the information illustrated in FIG. Then, the obtained setting signal of the duty ratio of “50%” is output to the monitoring unit 10 of the battery module 2-5 at the subsequent stage.

  Next, when the monitoring unit 10 of the battery module 2-5 determines that the “duty ratio of the input setting signal” is “50%” with reference to the information illustrated in FIG. “105” is acquired as “identification information” corresponding to “50%”, and the acquired “105” is stored in the storage unit 13 as its own identification information. The monitoring unit 10 of the battery module 2-5 acquires “60%” as “the duty ratio of the setting signal to be output” corresponding to “50%” with reference to the information illustrated in FIG. Then, the obtained setting signal of the duty ratio of “60%” is output to the control unit 3 at the subsequent stage.

  And the communication abnormality location specific | specification part 18 refers to the information shown in FIG. 7, "The duty ratio of the setting signal input" (The duty ratio of the setting signal output from the monitoring part 10 of the battery module 2-5) Is “60%”, “5” is stored in the storage unit 17 as the “number of battery modules 2” corresponding to the “60%”. Note that the information shown in FIG. 7 can be used when one monitoring unit 10 is provided in one battery module 2.

  Moreover, the communication abnormality location identification part 18 may obtain | require the number of the monitoring parts 10 according to the duty ratio of the setting signal output from the last monitoring part 10 with reference to the information shown in FIG. In this case, “number of battery modules 2” in the information shown in FIG. 7 is changed to “number of monitoring units 10”.

  Further, the communication abnormality point specifying unit 18 refers to the information in which “number of battery modules 2” in FIG. 7 is changed to “number of monitoring units 10”, and the setting signal output from the last monitoring unit 10 After obtaining the number of monitoring units 10 in accordance with the duty ratio, the number of battery modules 2 is obtained by dividing the number of monitoring units 10 by the number of monitoring units 10 provided for each battery module 2. May be. In this case, even if a plurality of monitoring units 10 are provided in one battery module 2 and each monitoring unit 10 is connected in a daisy chain, the number of battery modules 2 can be obtained.

Thereby, even if the number of the battery modules 2 is changed in order to increase or decrease the overall capacity of the batteries 5 connected in parallel, the communication abnormality location specifying unit 18 grasps the number of the battery modules 2 and the monitoring units 10. Therefore, the control unit 3 can control each battery module 2 and each monitoring unit 10. Thereby, it is not necessary to change the program constant or to prepare another program in accordance with the change in the number of battery modules 2, so that it is possible to suppress an increase in management cost and manufacturing cost.
Next, for example, a communication abnormality occurs between the battery modules 2-2 and 2-3, and the duty ratio of the setting signal input to the monitoring unit 10 of the battery module 2-3 is changed from “30%” to “0%”. The operation of each of the monitoring units 10 and the control unit 3 of the battery modules 2-3 to 2-5 will be described.

  First, when the monitoring unit 10 of the battery module 2-3 determines that the “duty ratio of the input setting signal” has changed from “30%” to “0%”, the information illustrated in FIG. Then, “20%” is acquired as the “duty ratio of the setting signal to be output” corresponding to the “0%”, and the acquired setting signal of the duty ratio of “20%” is sent to the battery module 2-4 in the subsequent stage. Output to the monitoring unit 10.

  Next, when the monitoring unit 10 of the battery module 2-4 determines that the “duty ratio of the input setting signal” has changed from “40%” to “20%”, the information illustrated in FIG. Then, “30%” is acquired as the “duty ratio of the setting signal to be output” corresponding to the “20%”, and the acquired setting signal of the duty ratio of “30%” is used as the battery module 2-4 in the subsequent stage. To the monitoring unit 10.

  Next, when the monitoring unit 10 of the battery module 2-5 determines that the “duty ratio of the input setting signal” has changed from “50%” to “30%”, the information illustrated in FIG. Then, “40%” is acquired as the “duty ratio of the setting signal to be output” corresponding to the “30%”, and the acquired setting signal of the duty ratio of “40%” is output to the control unit 3 at the subsequent stage. To do.

  Next, the communication abnormality point specifying unit 18 of the control unit 3 indicates that the “duty ratio of the input setting signal” (the duty ratio of the setting signal output from the monitoring unit 10 of the battery module 2-5) is “60%”. If it is determined that the value has changed to “40%”, “−20%” is obtained as the amount of change in the duty ratio.

  Then, the communication abnormality point specifying unit 18 refers to the information shown in FIG. 6A as the “battery module 2-2” as the “communication abnormality occurrence point” corresponding to the duty ratio variation “−20%”. 2-3 ”is acquired.

  The control unit 3 according to the first embodiment can identify the occurrence location of the communication abnormality according to the change amount of the duty ratio of the setting signal output from the last monitoring unit 10. In addition, when setting identification information using the duty ratio of the setting signal in this way, communication is more difficult than setting identification information using a signal that requires complex processing such as modulation processing or encoding processing. The parts 10 and 19 can have a simple configuration.

It should be noted that the setting process of identification information and the identification process of the location of occurrence of communication abnormality may be performed using the frequency of the setting signal, the number of pulses of the setting signal per unit time, or the numerical value or character information indicated in the setting signal. Good.
<Example 2>
The identification information setting unit 14 of each monitoring unit 10 changes the duty ratio of the rectangular wave as the input setting signal (the setting signal output from the preceding control unit 3 or the preceding monitoring unit 10) by + 10%. Then, the setting signal with the duty ratio changed is output to the subsequent monitoring unit 10 or the subsequent control unit 3. For example, with reference to the information shown in FIG. 5B, the identification information setting unit 14 outputs a setting signal with a duty ratio of 20% when the duty ratio of the input setting signal is 10%. When the setting signal duty ratio is 20%, a setting signal with a duty ratio of 30% is output. When the input setting signal duty ratio is 30%, a setting signal with a duty ratio of 40% is output. When the duty ratio of the input setting signal is 40%, a setting signal with a duty ratio of 50% is output. When the duty ratio of the input setting signal is 50%, a setting signal with a duty ratio of 60% is output. To do.

  In addition, the identification information setting unit 14 of each monitoring unit 10 has a duty ratio of 0% or 100% of the input setting signal (the setting signal output from the previous control unit 3 or the previous monitoring unit 10), respectively. Then, a setting signal in which the duty ratio of the setting signal output from the head monitoring unit 10 is changed by −10% is output to the subsequent monitoring unit 10. For example, the identification information setting unit 14 refers to the information shown in FIG. 5B, and when the duty ratio of the input setting signal is 0% or 100%, the duty ratio is 10% (20% −10 % = 10%) is output.

  The communication abnormality location identifying unit 18 of the control unit 3 identifies the location where the communication abnormality has occurred according to the amount of change in the duty ratio of the input setting signal (the setting signal output from the last monitoring unit 10). For example, with reference to the information shown in FIG. 6B, the communication abnormality location specifying unit 18 refers to the “control unit” as the occurrence location of the communication abnormality when the change amount of the duty ratio of the input setting signal is −10%. 3 and the battery module 2-1 ”is specified, and when the amount of change in the duty ratio of the input setting signal is −20%,“ between the battery modules 2-1 and 2-2 ” ”And when the change amount of the duty ratio of the setting signal to be input is −30%,“ between battery modules 2-2 and 2-3 ”is specified as the location of occurrence of communication abnormality and the setting to be input When the change amount of the duty ratio of the signal is −40%, “between battery modules 2-3 and 2-4” is specified as the location where the communication abnormality occurs, and the change amount of the duty ratio of the input setting signal is − At 50%, “Telephone” When “between modules 2-4 and 2-5” is specified, and the amount of change in the duty ratio of the input setting signal is −60%, “battery module 2-5 and control unit 3 Identify “between”.

The setting information initial setting process according to the second embodiment is the same as the setting information initial setting process according to the first embodiment, and thus the description thereof is omitted.
Next, for example, a communication abnormality occurs between the battery modules 2-2 and 2-3, and the duty ratio of the setting signal input to the monitoring unit 10 of the battery module 2-3 is changed from “30%” to “0%”. The operation of each of the monitoring units 10 and the control unit 3 of the battery modules 2-3 to 2-5 will be described.

  First, when the monitoring unit 10 of the battery module 2-3 determines that the “duty ratio of the input setting signal” has changed from “30%” to “0%”, the monitoring unit 10 refers to the information illustrated in FIG. Then, “10%” is acquired as the “duty ratio of the setting signal to be output” corresponding to the “0%”, and the acquired setting signal of the duty ratio of “10%” is sent to the battery module 2-4 in the subsequent stage. Output to the monitoring unit 10.

  Next, when the monitoring unit 10 of the battery module 2-4 determines that the “duty ratio of the input setting signal” has changed from “40%” to “10%”, the information illustrated in FIG. Then, “20%” is acquired as the “duty ratio of the setting signal to be output” corresponding to the “10%”, and the acquired setting signal of the duty ratio of “20%” is used as the subsequent battery module 2-5. To the monitoring unit 10.

  Next, when the monitoring unit 10 of the battery module 2-5 determines that the “duty ratio of the input setting signal” has changed from “50%” to “20%”, the information illustrated in FIG. Then, “30%” is acquired as the “duty ratio of the setting signal to be output” corresponding to the “20%”, and the acquired setting signal of the duty ratio of “30%” is output to the control unit 3 at the subsequent stage. To do.

  Next, the communication abnormality point specifying unit 18 of the control unit 3 indicates that the “duty ratio of the input setting signal” (the duty ratio of the setting signal output from the monitoring unit 10 of the battery module 2-5) is “60%”. If it is determined that the value has changed to “30%”, “−30%” is obtained as the amount of change in the duty ratio.

  Then, the communication abnormality point specifying unit 18 refers to the information shown in FIG. 6B and displays “battery module 2-2” as the “communication abnormality occurrence point” corresponding to the duty ratio change amount “−30%”. 2-3 ”is acquired.

Also in the control unit 3 according to the second embodiment, it is possible to identify the location where the communication abnormality occurs according to the amount of change in the duty ratio of the setting signal output from the last monitoring unit 10.
Moreover, in Example 2, when a communication abnormality occurs between the control unit 3 and the battery module 2-1, the setting signal output from the monitoring unit 10 of the battery module 2-1 changes. Therefore, the control unit 3 also specifies that a communication abnormality has occurred between the control unit 3 and the battery module 2-1 according to the amount of change in the duty ratio of the setting signal output from the last monitoring unit 10. be able to. Therefore, the battery monitoring device 1 according to the second embodiment can expand the specific range of the location where the communication abnormality has occurred, compared to the battery monitoring device 1 according to the first embodiment.
<Example 3>
The identification information setting unit 14 of each monitoring unit 10 changes the duty ratio of the rectangular wave as the input setting signal (the setting signal output from the preceding control unit 3 or the preceding monitoring unit 10) by + 10%. Then, the setting signal with the duty ratio changed is output to the subsequent monitoring unit 10 or the subsequent control unit 3. For example, referring to the information shown in FIG. 5 (c), the identification information setting unit 14 outputs a setting signal with a duty ratio of 20% when the duty ratio of the input setting signal is 10%. When the setting signal duty ratio is 20%, a setting signal with a duty ratio of 30% is output. When the input setting signal duty ratio is 30%, a setting signal with a duty ratio of 40% is output. When the duty ratio of the input setting signal is 40%, a setting signal with a duty ratio of 50% is output. When the duty ratio of the input setting signal is 50%, a setting signal with a duty ratio of 60% is output. To do.

  In addition, the identification information setting unit 14 of each monitoring unit 10 has a duty ratio of 0% or 100% of the input setting signal (the setting signal output from the previous control unit 3 or the previous monitoring unit 10), respectively. Then, a setting signal in which the duty ratio of the setting signal output from the first monitoring unit 10 is changed by + 5% is output to the subsequent monitoring unit 10. For example, the identification information setting unit 14 refers to the information shown in FIG. 5C, and when the duty ratio of the input setting signal is 0% or 100%, the duty ratio is 25% (20% + 5%). = 25%) setting signal is output.

  The communication abnormality location identifying unit 18 of the control unit 3 identifies the location where the communication abnormality has occurred according to the amount of change in the duty ratio of the input setting signal (the setting signal output from the last monitoring unit 10). For example, referring to the information shown in FIG. 6C, the communication abnormality point specifying unit 18 refers to the “control unit 3” as a communication abnormality occurrence point when the change amount of the duty ratio of the input setting signal is + 5%. And “between battery modules 2-1” and “between battery modules 2-1 and 2-2” as the location of occurrence of communication abnormality when the change amount of the duty ratio of the input setting signal is −5%. When the change amount of the duty ratio of the input setting signal is −15%, “between battery modules 2-2 and 2-3” is specified as the location where the communication abnormality occurs, and the input setting signal When the change amount of the duty ratio is −25%, “between battery modules 2-3 and 2-4” is specified as the location where the communication abnormality occurs, and the change amount of the duty ratio of the input setting signal is −35. %, “Battery mode” If the change amount of the duty ratio of the input setting signal is −60%, the location of the communication abnormality is “between the battery module 2-5 and the control unit 3”. Identify “between”.

The initial setting process for setting information according to the third embodiment is the same as the initial setting process for setting information according to the first embodiment, and thus the description thereof is omitted.
Next, for example, a communication abnormality occurs between the battery modules 2-2 and 2-3, and the duty ratio of the setting signal input to the monitoring unit 10 of the battery module 2-3 is changed from “30%” to “0%”. The operation of each of the monitoring units 10 and the control unit 3 of the battery modules 2-3 to 2-5 will be described.

  First, when the monitoring unit 10 of the battery module 2-3 determines that the “duty ratio of the input setting signal” has changed from “30%” to “0%”, the monitoring unit 10 refers to the information illustrated in FIG. Then, “25%” is acquired as the “duty ratio of the setting signal to be output” corresponding to “0%”, and the acquired setting signal of the duty ratio of “25%” is sent to the battery module 2-4 in the subsequent stage. Output to the monitoring unit 10.

  Next, when the monitoring unit 10 of the battery module 2-4 determines that the “duty ratio of the input setting signal” has changed from “40%” to “25%”, the information illustrated in FIG. Then, “35%” is acquired as the “duty ratio of the setting signal to be output” corresponding to the “25%”, and the acquired setting signal of the duty ratio of “35%” is used as the battery module 2-5 in the subsequent stage. To the monitoring unit 10.

  Next, when the monitoring unit 10 of the battery module 2-5 determines that the “duty ratio of the input setting signal” has changed from “50%” to “35%”, the information illustrated in FIG. Then, “45%” is acquired as the “duty ratio of the setting signal to be output” corresponding to the “35%”, and the acquired setting signal of the duty ratio of “45%” is output to the control unit 3 at the subsequent stage. To do.

  Next, the communication abnormality point specifying unit 18 of the control unit 3 indicates that the “duty ratio of the input setting signal” (the duty ratio of the setting signal output from the monitoring unit 10 of the battery module 2-5) is “60%”. If it is determined that the value has changed to “45%”, “−15%” is obtained as the amount of change in the duty ratio.

  And the communication abnormality location specific | specification part 18 refers to the information shown in FIG.6 (c), and "battery module 2-2" is shown as "communication abnormality occurrence location" corresponding to duty ratio variation | change_quantity "-15%". 2-3 ”is acquired.

Also in the control unit 3 according to the third embodiment, it is possible to identify the occurrence location of the communication abnormality according to the amount of change in the duty ratio of the setting signal output from the last monitoring unit 10.
Also in the third embodiment, when a communication abnormality occurs between the control unit 3 and the battery module 2-1, the setting signal output from the monitoring unit 10 of the battery module 2-1 changes. Therefore, the control unit 3 also specifies that a communication abnormality has occurred between the control unit 3 and the battery module 2-1 according to the amount of change in the duty ratio of the setting signal output from the last monitoring unit 10. be able to. Therefore, also in the battery monitoring apparatus 1 according to the third embodiment, the specific range of the occurrence location of the communication abnormality can be expanded as compared with the battery monitoring apparatus 1 according to the first embodiment.

DESCRIPTION OF SYMBOLS 1 Battery monitoring apparatus 2 Battery module 3 Control part 4 Main relay 5 Battery 6 Relay 7 Voltage detection part 8 Current detection part 9 Temperature detection part 10 Monitoring part 11 Load 12 Relay control part 13 Storage part 14 Identification information setting part 15 Communication part 16 Relay control unit 17 Storage unit 18 Communication abnormality location specifying unit 19 Communication unit

Claims (7)

A plurality of monitoring units that are connected in series with each other and each monitor the state of the battery,
A control unit that is connected in series with the plurality of monitoring units and communicates with the plurality of monitoring units using identification information assigned to the plurality of monitoring units;
With
Each of the plurality of monitoring units assigns identification information corresponding to a setting signal output from the control unit or the monitoring unit in the previous stage as its own identification information, and changes the setting signal to change the monitoring signal in the subsequent stage. Or output to the control unit,
The control unit identifies a location where a communication abnormality has occurred in accordance with a change amount of the setting signal output from the last monitoring unit. The battery monitoring device according to claim 1,
Each of the plurality of monitoring units changes the duty ratio of the setting signal and outputs it to the subsequent monitoring unit or the control unit,
The battery monitoring device, wherein the control unit identifies a location where a communication abnormality has occurred according to a change amount of a duty ratio of the setting signal output from the last monitoring unit. The battery monitoring device according to claim 2,
Each of the plurality of monitoring units changes the duty ratio of the setting signal by + 10% and outputs it to the subsequent monitoring unit or the control unit, and the setting signal output from the previous control unit or the monitoring unit When the duty ratio becomes 0% or 100%, the battery monitoring apparatus is characterized in that a setting signal having the same duty ratio as the setting signal output from the first monitoring unit is output to the monitoring unit in the subsequent stage. The battery monitoring device according to claim 2,
Each of the plurality of monitoring units changes the duty ratio of the setting signal by + 10% and outputs it to the subsequent monitoring unit or the control unit, and the setting signal output from the previous control unit or the monitoring unit When the duty ratio becomes 0% or 100%, a setting signal in which the duty ratio of the setting signal output from the first monitoring unit is changed by -10% is output to the monitoring unit in the subsequent stage. Battery monitoring device. The battery monitoring device according to claim 2,
Each of the plurality of monitoring units changes the duty ratio of the setting signal by + 10% and outputs it to the subsequent monitoring unit or the control unit, and the setting signal output from the previous control unit or the monitoring unit When the duty ratio reaches 0% or 100%, a setting signal in which the duty ratio of the setting signal output from the first monitoring unit is changed by + 5% is output to the subsequent monitoring unit. Monitoring device. The battery monitoring device according to claim 1,
The plurality of monitoring units respectively change the frequency of the setting signal or the number of pulses per unit time and output to the monitoring unit or the control unit in the subsequent stage,
The control unit identifies a location where a communication abnormality has occurred according to the frequency of the setting signal output from the last monitoring unit or the amount of change in the number of pulses per unit time. . A plurality of monitoring units that are connected in series with each other and each monitor the state of the battery,
A control unit that is connected in series with the plurality of monitoring units and communicates with the plurality of monitoring units using identification information assigned to the plurality of monitoring units;
Each of the plurality of monitoring units changes a setting signal output from the control unit or the monitoring unit in the previous stage and outputs the change signal to the monitoring unit or the control unit in the subsequent stage,
The said control part recognizes the number of battery modules provided with the said monitoring part or the said monitoring part according to the said setting signal output from the said monitoring part of the last. The battery monitoring apparatus characterized by the above-mentioned.

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