JP2016201217A - Battery monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery monitoring system that enables a monitoring device to specify a trouble site in each voltage detection device while assigning an identification number unique to each voltage detection device.SOLUTION: In a battery monitoring system which includes a plurality of voltage detection devices which are connected in series to detect the voltage of each of battery cells of a battery pack, and a monitoring device for monitoring the detected voltage, the monitoring device transmits a count command signal for instructing counting of an identification number to a voltage detection device at one end. The voltage detection device receives the count command signal transmitted from the monitoring device or the voltage detection device at the preceding stage, stores the incremented identification number into storage means according to the count command signal, and transmits a response signal to the monitoring device after the time corresponding to the identification number of the storage means. The voltage detection device excluding the voltage detection device at the other end transmits the count command signal including the identification number of the storage means to the voltage detection device at the rear state. The monitoring device receives the response signal from the voltage detection device and on the basis of the response signal. specifies failure parts in the plurality of voltage detection devices.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a battery monitoring system that monitors the voltage of each battery cell constituting an assembled battery.

  Conventionally, a system for monitoring the voltage of each of a plurality of battery cells connected in series is known (see, for example, Patent Document 1). The system described in Patent Document 1 includes a voltage detection device that detects the voltage of each battery cell, and a monitoring device that monitors the voltage of each battery cell.

  The voltage detection device is provided corresponding to each battery cell. All the voltage detection devices are connected in series via a communication line. In addition, the monitoring device is connected to a voltage detection device (frontmost voltage detection device) present at one end of all the voltage detection devices via a communication line. Each voltage detection device receives specific information that is an identification number transmitted from the previous stage, stores the received specific information in a storage area as its own ID signal, and receives information (specifically, for the received specific information). Is added with “1”) and transmitted to the subsequent voltage detection apparatus. According to such a system, specific information (ID information) unique to each voltage detection device can be given.

  The monitoring device exchanges information with each voltage detection device. For this reason, the voltage of the battery cell detected by each voltage detection apparatus can be collected in the monitoring apparatus.

JP 2011-181392A

  However, in the system described in Patent Document 1, when a failure such as a disconnection or a short circuit occurs on a communication line connecting any two voltage detection devices, or when a failure of the voltage detection device itself occurs, the monitoring device The failure location cannot be specified.

  The present invention has been made in view of the above points, and provides a battery monitoring system capable of causing a monitoring device to identify a fault location in the voltage detection device while giving a unique identification number to each voltage detection device. The purpose is to provide.

  One aspect of the present invention includes a plurality of voltage detection devices connected in series for detecting the voltage of each battery cell constituting an assembled battery, and a monitoring device for monitoring the voltage detected by the voltage detection device; The monitoring device comprises a monitoring-side transmission means for transmitting a count command signal for instructing counting of an identification number toward the voltage detection device existing at one end of all the voltage detection devices. The voltage detection device includes: a detection-side reception unit that receives the count command signal transmitted from the monitoring-side transmission unit of the monitoring device or the previous voltage detection device; and the detection-side reception unit An identification number control means for storing in the storage means the identification number incremented in accordance with the counted command signal, and the identification number stored in the storage means First detection side transmission means for transmitting a response signal in response to the count command signal toward the monitoring device after a lapse of a corresponding time, and is present at the other end of all the voltage detection devices The voltage detection device excluding the voltage detection device has second detection-side transmission means for transmitting the count command signal including the identification number stored in the storage means to the voltage detection device in the subsequent stage, The monitoring device includes a monitoring-side receiving unit that receives the response signal transmitted from the first detection-side transmitting unit of the voltage detection device, and a serial connection based on the response signal received by the monitoring-side receiving unit. And a failure detection means for identifying a failure location in the plurality of voltage detection devices connected to the battery monitoring system.

  According to the present invention, it is possible to cause the monitoring device to identify a failure location in the voltage detection device while giving a unique identification number to each voltage detection device.

It is a block diagram of the battery monitoring system which is one Example of this invention. It is an operation | movement time chart of an example implement | achieved when there is no failure location in the battery monitoring system of a present Example. It is an operation | movement time chart of an example implement | achieved when there exists a failure location in the battery monitoring system of a present Example. It is a flowchart of an example of the control routine performed in the battery monitoring system of a present Example.

  Hereinafter, specific embodiments of a battery monitoring system according to the present invention will be described with reference to the drawings.

  FIG. 1 shows a configuration diagram of a battery monitoring system 10 according to an embodiment of the present invention.

  The battery monitoring system 10 of the present embodiment is a system that monitors battery cells that constitute an assembled battery. This assembled battery has a configuration in which battery cells, which are a plurality of secondary batteries, are connected in series. The assembled battery is a lithium battery, a nickel-cadmium battery, a nickel metal hydride battery, or the like. This assembled battery is mounted on a vehicle or the like.

  The battery monitoring system 10 includes a detection device 12 and a monitoring device 14. The detection device 12 has a plurality of voltage detection devices 16 corresponding to the plurality of battery cells of the assembled battery. The monitoring device 14 and the plurality of voltage detection devices 16 are daisy chain connected.

  The monitoring device 14 is an electronic control unit mainly composed of a microcomputer (hereinafter referred to as a microcomputer) 18. Hereinafter, the monitoring device 14 is referred to as an ECU 14. The microcomputer 18 has a peripheral function CSI (Computer System Interface). The ECU 14 includes a CPU that executes programs, a ROM that stores programs and data, a RAM that temporarily stores data, and input / output ports connected to peripheral devices. Specifically, the ECU 14 has, as input / output ports, a TxD port that transmits transmission data, a CLK port that outputs a clock signal, and an RxD port that receives reception data.

  The voltage detection device 16 is provided for each battery cell. A plurality of voltage detection devices 16 are arranged in the battery stack. Each voltage detection device 16 is a battery detection IC (Integrated Circuit) that detects the voltage across the corresponding battery cell. Hereinafter, the voltage detection device 16 is referred to as a battery detection IC 16. Further, n battery cells are provided, and the battery detection ICs 16 are designated as battery detection ICs 16-1, 16-2, ..., 16-n. These n battery detection ICs 16 are connected in series.

  The ECU 14 is connected to one battery detection IC 16-1 of the detection device 12 via the communication lines 20, 22, and 24. Each of the communication lines 20, 22, and 24 is composed of two signal lines so that a differential signal can be circulated. Hereinafter, the battery detection IC 16-1 directly connected to the ECU 14 is referred to as the front-stage battery detection IC 16-1, and the battery detection IC 16-n existing farthest from the ECU 14 is referred to as the last-stage battery detection IC 16-n.

  The communication line 20 is a differential signal line that is connected to the TxD port of the ECU 14 and distributes data from the ECU 14 toward the battery detection IC 16-1 at the front stage. The communication line 22 is a differential signal line that is connected to the CLK port of the ECU 14 and distributes the clock signal from the ECU 14 toward the battery detection IC 16-1 at the front stage. The communication line 24 is a differential signal line that is connected to the RxD port of the ECU 14 and distributes data from the battery detection IC 16-1 at the front stage toward the ECU 14.

  Each battery detection IC 16 includes a front-stage reception port, a rear-stage transmission port, a rear-stage reception port, and a front-stage transmission port. The reception port for the front stage is a reception port that receives data from the ECU 14 or the battery detection IC 16 of the front stage. The rear-stage transmission port is a transmission port that transmits data toward the rear-stage battery detection IC 16. The subsequent-stage reception port is a reception port that receives data from the subsequent-stage battery detection IC 16. The upstream transmission port is a transmission port that transmits data to the upstream battery detection IC 16 or the ECU 14.

  Communication lines 20 and 22 are connected to the reception port for the front stage of the battery detection IC 16-1 at the front stage. Between the two battery detection ICs 16, communication lines 26 and 28 that connect the ports are interposed. Each of the communication lines 26 and 28 is composed of two signal lines so as to distribute a differential signal. The communication line 26 connects the transmission port for the rear stage of the battery detection IC 16 at the front stage and the reception port for the front stage of the battery detection IC 16 at the rear stage, and distributes the data from the battery detection IC 16 at the front stage toward the battery detection IC 16 at the rear stage. It is a differential signal line. The communication line 28 connects the transmission port for the front stage of the battery detection IC 16 at the rear stage and the reception port for the rear stage of the battery detection IC 16 at the rear stage, and distributes data from the battery detection IC 16 at the rear stage toward the battery detection IC 16 at the front stage. It is a differential signal line.

  A short-circuit wire 34 is connected to a predetermined terminal of the battery detection IC 16-1 at the foremost stage. When detecting that the predetermined terminal is short-circuited by the short-circuit line 34, the foremost battery detection IC 16-1 determines that the own battery detection IC 16 is the foremost battery detection IC 16-1. The front-stage battery detection IC 16-1 determines that the own battery detection IC 16 is the front-stage battery detection IC 16-1, and uses data and a clock signal transmitted from the ECU 14 via the communication lines 20 and 22 for the previous stage. When the signal is received at the receiving port, the superimposed signal obtained by superimposing the data and the clock signal is converted into a differential signal. Then, the superimposed signal is transmitted from the subsequent-stage transmission port to the next-stage battery detection IC 16-2 via the communication line 26.

  The battery detection ICs 16 in the second and subsequent stages (except for the battery detection IC 16-n in the last stage) each receive a superimposed signal transmitted from the battery detection IC 16 in the previous stage via the communication line 26 at the reception port for the previous stage. When received, the superimposed signal is transmitted from the subsequent-stage transmission port to the battery detection IC 16 at the next stage via the communication line 26.

  A short circuit line 36 is connected to a predetermined terminal of the battery detection IC 16-n at the last stage. The rear-stage transmission port and the rear-stage reception port of the last-stage battery detection IC 16-n are short-circuited. When the last battery detection IC 16-n detects that the predetermined terminal is short-circuited by the short-circuit line 36, the last battery detection IC 16-n determines that the own battery detection IC 16 is the last battery detection IC 16-n. The battery detection IC 16-n at the last stage determines that the own battery detection IC 16 is the battery detection IC 16-n at the last stage and is transmitted from the battery detection IC 16- (n-1) at the previous stage via the communication line 26. When the superimposition signal to be received is received at the reception port for the previous stage, the return signal in response to the superimposition signal is converted into a differential signal. Then, the return signal is transmitted from the transmission port for the previous stage toward the battery detection IC 16- (n-1) of the previous stage via the communication line 28.

  When each of the battery detection ICs 16 from the second stage to the last stage receives the return signal transmitted from the subsequent stage battery detection IC 16 via the communication line 28 at the reception port for the rear stage, Is transmitted from the transmission port to the battery detection IC 16 in the previous stage via the communication line 28. When the front-stage battery detection IC 16-1 receives the return signal transmitted from the rear-stage battery detection IC 16-2 via the communication line 28 at the rear-stage reception port, the front-stage battery detection IC 16-1 removes the clock signal from the return signal. Convert to differential signal. Then, the return signal excluding the clock signal is transmitted from the front-stage transmission port to the ECU 14 via the communication line 24. The ECU 14 can receive the return signal transmitted from the battery detection IC 16-1 at the front stage via the communication line 24 after transmission of the data and the clock signal from the communication lines 20 and 22 at the RxD port.

  Each battery detection IC 16 has a volatile memory 32. The volatile memory 32 stores an address as an identification number assigned to the own battery detection IC 16. Each battery detection IC 16 stores an address in the volatile memory 32 and performs control according to the address stored in the volatile memory 32. Each battery detection IC 16 operates in synchronization with the clock signal.

  Next, the operation of the battery monitoring system 10 of this embodiment will be described with reference to FIGS.

  FIG. 2 shows an example of an operation time chart realized when there is no failure location in the battery monitoring system 10 of the present embodiment. FIG. 3 shows an example of an operation time chart realized when there is a failure location in the battery monitoring system 10 of the present embodiment. FIG. 4 shows a flowchart of an example of a control routine executed in the battery monitoring system 10 of the present embodiment.

  In the battery monitoring system 10 of the present embodiment, the microcomputer 18 of the ECU 14 first (1) issues a connection confirmation instruction to the battery detection IC 16 by the peripheral function CSI. Specifically, a signal for instructing connection (connection confirmation signal) is transmitted from the TxD port to the foremost battery detection IC 16-1 via the communication line 20, and a clock signal is transmitted from the CLK port to the communication line 22. To the frontmost battery detection IC 16-1.

  When the front-stage battery detection IC 16-1 receives the connection confirmation signal and the clock signal from the ECU 14 at the front-stage reception port, the front-stage battery detection IC 16-1 generates a superposition signal by superimposing the connection confirmation signal and the clock signal. Convert to differential signal. Then, the superimposed signal is transmitted from the subsequent-stage transmission port to the next-stage battery detection IC 16-2 via the communication line 26. Each of the battery detection ICs 16 present in the subsequent stage of the battery detection IC 16-1 in the foremost stage receives a superimposed signal obtained by superimposing the connection confirmation signal and the clock signal from the battery detection IC 16 in the previous stage at the reception port for the previous stage. The superimposed signal is gatewayed and transmitted from the subsequent-stage transmission port to the next-stage battery detection IC 16 via the communication line 26.

  When the last-stage battery detection IC 16-n receives the superimposed signal obtained by superimposing the connection confirmation signal and the clock signal from the previous-stage battery detection IC 16- (n-1) at the reception port for the previous stage, the connection confirmation is performed. A folding signal in response to the signal is generated and converted into a differential signal. Then, the return signal is transmitted from the transmission port for the previous stage to the battery detection IC 16- (n-1) of the previous stage via the communication line 28. When each of the battery detection ICs 16 existing before the last-stage battery detection IC 16-n receives a return signal from the next-stage battery detection IC 16 at the subsequent-stage reception port, it gateways the return signal and transmits it for the previous stage. The data is transmitted from the port to the immediately preceding battery detection IC 16 via the communication line 28.

  When the first-stage battery detection IC 16-1 receives the return signal from the second-stage battery detection IC 16-2 at the subsequent-stage reception port, the first-stage battery detection IC 16-1 removes the clock signal from the return signal and converts it to a differential signal. . Then, the return signal excluding the clock signal is transmitted from the front-stage transmission port to the ECU 14 via the communication line 24.

  The microcomputer 18 of the ECU 14 (1) performs connection confirmation based on the return signal from the battery detection IC 16-1 at the front stage after the connection confirmation instruction. Specifically, when the return signal from the battery detection IC 16-1 at the front stage is received at the RxD port, it is determined that all the battery detection ICs are properly connected. On the other hand, if the return signal from the battery detection IC 16-1 at the foremost stage is not received, it is determined that the connection is not properly made at any location.

  Next, the microcomputer 18 of the ECU 14 performs (3) connection confirmation address count instruction to the battery detection IC 16 by the peripheral function CSI (step 100). Specifically, a signal for instructing connection confirmation address counting (address count instruction signal) is transmitted from the TxD port to the battery detection IC 16-1 at the forefront stage via the communication line 20, and a clock signal is transmitted from the CLK port. It transmits toward the battery detection IC 16-1 in the forefront stage via the communication line 22. The address count instruction signal transmitted by the ECU 14 includes an address value indicating the address of the battery detection IC 16 having an initial value (zero).

  When the battery detection IC 16-1 at the front stage receives the address count instruction signal and the clock signal from the ECU 14 at the reception port for the front stage (step 200), (4) an address value (specifically, included in the address count instruction signal) 1 is added (incremented) to the initial value zero) (step 210). Then, the address value obtained by the addition is stored in the volatile memory 32 (step 220). Further, (5) a superimposed signal is generated by superimposing the address count instruction signal including the address value obtained by the addition and the clock signal from the ECU 14, and the superimposed signal is converted into a differential signal. The superimposition signal is transmitted from the subsequent-stage transmission port to the next-stage battery detection IC 16-2 via the communication line 26 (step 230).

  Further, the battery detection IC 16-1 at the forefront stage obtains the address value by adding the address value as described above, and then responds to the address count instruction signal from the ECU 14 based on the obtained address value. The timing (response time T1) at which the signal is output to the ECU 14 is calculated (step 240). Specifically, the address output from the own battery detection IC 16-1 after the address count response signal output to the ECU 14 by the next battery detection IC 16-2 reaches the ECU 14 through the gateway of the own battery detection IC 16-1. Timing calculation is performed so that the count response signal reaches the ECU 14 through the communication line 24.

  The response time T1 is a constant obtained by subtracting its own address value “1” from the maximum number of battery detection ICs 16 that can be included in the detection device 12, for example. This time is set to a time that does not overlap with the address count response signal output from the battery detection IC 16 in the subsequent stage.

  Each of the battery detection ICs 16 existing after the battery detection IC 16-1 at the foremost stage receives a superimposed signal obtained by superimposing the address count instruction signal and the clock signal from the battery detection IC 16 at the previous stage at the reception port for the previous stage. (Step 200), (4) "1" is added to the address value included in the address count instruction signal (Step 210). Then, the address value obtained by the addition is stored in the volatile memory 32 (step 220). Further, (5) a superimposed signal is generated by superimposing the address count instruction signal including the address value obtained by the addition and the clock signal from the ECU 14, and the superimposed signal is converted into a differential signal. The superimposition signal is transmitted from the subsequent-stage transmission port to the next-stage battery detection IC 16 via the communication line 26 (step 230).

  Further, each battery detection IC 16 is obtained by adding the address value as described above, and then, based on the address value obtained by the addition, an address responding to the address count instruction signal from the battery detection IC 16 in the previous stage. Timing (response time T) for outputting the count response signal to the ECU 14 is calculated (step 240). Specifically, the address count response signal output from the own battery detection IC 16 after the address count response signal output to the ECU 14 by the next battery detection IC 16 reaches the ECU 14 through the gateway of the own battery detection IC 16-1 Timing calculation is performed so as to reach the ECU 14 through the communication line 24. The response time T is, for example, a time obtained by multiplying a value obtained by subtracting its own address value from the maximum number of battery detection ICs 16 that can be included in the detection device 12 by the above constant. It is.

  Each battery detection IC 16 calculates the response time T as described above, and at a timing according to the response time T, (6) sends an address count response signal from the previous-stage transmission port via the communication line 28 to the previous-stage transmission port. Transmission is performed toward the battery detection IC 16 (step 250). When each of the battery detection ICs 16 receives the address count response signal from the subsequent battery detection IC 16 at the subsequent reception port, the battery detection IC 16 gateways the address count response signal from the previous transmission port via the communication line 28. It transmits toward the battery detection IC 16 in the previous stage.

  When the front-stage battery detection IC 16-1 receives the address count response signal from the next-stage battery detection IC 16-2 at the rear-stage reception port, it gateways the address count response signal and communicates from the front-stage transmission port. It transmits toward ECU14 via the line 24. In addition, transmission of the response signal from each battery detection IC 16 to the ECU 14 is performed in order from the larger address value without time overlap.

  The microcomputer 18 of the ECU 14 (3) confirms the response to the connection confirmation address count instruction based on the address count response signal from each battery detection IC 16 after the connection confirmation address count instruction (step 110). ECU14 grasps | ascertains beforehand the timing which each battery detection IC16 outputs an address count response signal for every address value. Specifically, the ECU 14 determines whether or not each of the address count response signals from all the battery detection ICs 16 can be received at a desired timing as the above-described response confirmation.

  When the microcomputer 18 of the ECU 14 determines that the address count response signals from all the battery detection ICs 16 have been received at the desired timing as shown in FIG. 2, the communication with all the battery detection ICs 16 is appropriate without any failure. It can be determined that the current state is normal.

  On the other hand, when the microcomputer 18 determines that the address count response signal from any of the battery detection ICs 16 cannot be received at a desired timing as shown in FIG. 3, communication with the battery detection IC 16 is appropriately performed. It can be determined that there is an abnormal state that cannot be performed.

  Specifically, when a failure such as a disconnection or a short circuit occurs on the communication line between the two battery detection ICs 16 or a failure occurs in the battery detection IC 16 itself, the battery detection ICs 16 existing on the downstream side of the failure point are It becomes impossible to output the address count response signal, or it becomes impossible for the address count response signal output by the battery detection IC 16 existing on the rear side of the failure portion to reach the ECU 14.

  Therefore, the microcomputer 18 of the ECU 14 detects that the battery detection IC 16 existing in the first stage among the battery detection ICs 16 that have not received the address count response signal has failed, or the battery detection that has failed to receive the address count response signal. It is determined that a failure has occurred in the communication lines 26 and 28 between the battery detection IC 16 that is present in the foremost stage of the IC 16 and the battery detection IC 16 that has received the address count response signal in the previous stage of the battery detection IC 16. (Step 120).

  Thus, in the battery monitoring system 10 of the present embodiment, the connection confirmation address count instruction from the ECU 14 is sent from the front battery detection IC 16-1 connected to the detection device 12 in series to the last battery detection IC 16-. n in order. Then, in the process of sending the connection confirmation address count instruction from the first battery detection IC 16-1 to the last battery detection IC 16-n, each battery detection IC 16 calculates and stores an address value and assigns the address value. can do.

  Further, after the address value is given to each battery detection IC 16 as described above, an address count response signal that responds to the connection confirmation address count instruction is sent to each battery detection IC 16 after the response time T according to the address value elapses. Can be output to. Then, it is possible to cause the ECU 14 to determine whether or not each of the address count response signals from all the battery detection ICs 16 can be received at a desired timing, and to specify a failure location in the plurality of battery detection ICs 16 connected in series. it can.

  Therefore, according to the battery monitoring system 10 of the present embodiment, while giving an address value, which is specific information unique to each battery detection IC 16, to the ECU 14, a failure location (for example, a disconnection position or The faulty battery detection IC 16) can be identified.

  In the above embodiment, the ECU 14 transmits the address count instruction signal to the “monitoring transmission means” described in the claims, and the battery detection IC 16 includes the address count including the initial address value from the ECU 14. The instruction signal is received in the “detection side receiving means” described in the claims, and the address value incremented by the battery detection IC 16 is stored in the volatile memory 32. The battery detection ICs 16 except for the last battery detection IC 16 among all the battery detection ICs 16 transmit an address count instruction signal including the address value in the volatile memory 32 to the next battery detection IC 16 to the control means. In the “second detection-side transmission means” described in the claims, the battery detection IC 16 is connected to the volatile memory 3. The response signal T is output to the ECU 14 after the response time T corresponding to the address value in the ECU has passed. In the “monitoring side receiving means” described in the claims that the signal is received, the ECU 14 specifies the failure location based on the response signal from each battery detection IC 16. It corresponds to “detection means”.

  By the way, in the above-described embodiment, the ECU 14 is caused to transmit an address count instruction signal including an address value having an initial value of zero, and each battery detection IC 16 is set to “1” in the address value included in the received address count instruction signal. Then, the address value after the addition is stored in the volatile memory 32, and an address count instruction signal including the address value after the addition is transmitted to the battery detection IC 16 at the next stage. I am going to do that.

  However, the present invention is not limited to this, and causes the ECU 14 to transmit an address count instruction signal including an address value whose initial value is “1”, and also causes each battery detection IC 16 to receive the received address count instruction signal. Is stored in the volatile memory 32, and the address value itself included in the address count instruction signal is added to "1". The instruction signal may be transmitted to the battery detection IC 16 at the next stage.

  That is, according to one aspect of the present invention, a plurality of voltage detection devices connected in series for detecting the voltage of each battery cell constituting an assembled battery, and a monitoring device for monitoring the voltage detected by the voltage detection device And the monitoring device transmits a count command signal for instructing counting of an identification number toward the voltage detection device existing at one end of all the voltage detection devices. The voltage detection device includes a detection side reception unit that receives the count command signal transmitted from the monitoring side transmission unit of the monitoring device or the previous voltage detection device, and the detection side reception unit. The identification number control means for storing the identification number in the storage means in accordance with the count command signal received in response to the identification number stored in the storage means First detection side transmission means for transmitting a response signal responding to the count command signal toward the monitoring device after a lapse of time, and the voltage existing at the other end of all the voltage detection devices The voltage detection device excluding the detection device has second detection-side transmission means for transmitting the count command signal including a value obtained by incrementing the identification number stored in the storage means to the subsequent voltage detection device. The monitoring device is based on a monitoring-side receiving unit that receives the response signal transmitted from the first detecting-side transmitting unit of the voltage detecting device, and the response signal received by the monitoring-side receiving unit. The battery monitoring system may include a failure detection unit that identifies a failure location in the plurality of voltage detection devices connected in series.

  Even in the configuration of such a modification, the same effect as in the above embodiment can be obtained. Specifically, while giving an address value, which is specific information unique to each battery detection IC 16, the ECU 14 is caused to specify a failure location (for example, a disconnection position or a failed battery detection IC 16) in the battery detection IC 16 of the detection device 12. be able to.

10 Battery monitoring system 14 Monitoring device (ECU)
16 Voltage detector (battery detection IC)
18 Microcomputer
20, 22, 24, 26, 28 Communication line 32 Volatile memory

Claims (1)

A battery monitoring system comprising: a plurality of voltage detection devices connected in series for detecting the voltage of each battery cell constituting an assembled battery; and a monitoring device for monitoring the voltage detected by the voltage detection device. And
The monitoring device has monitoring-side transmission means for transmitting a count command signal for instructing counting of an identification number toward the voltage detection device existing at one end of all the voltage detection devices,
The voltage detection device includes: a detection-side reception unit that receives the count command signal transmitted from the monitoring-side transmission unit of the monitoring device or the preceding voltage detection device; and the count received by the detection-side reception unit. An identification number control means for storing in the storage means the identification number incremented according to the command signal, and responding to the count command signal toward the monitoring device after a time corresponding to the identification number stored in the storage means has elapsed. First detection side transmission means for transmitting a response signal to
The voltage detection devices other than the voltage detection device existing at the other end among all the voltage detection devices direct the count command signal including the identification number stored in the storage means to the voltage detection device in the subsequent stage. Second detection side transmission means for transmitting
The monitoring device includes a monitoring-side receiving unit that receives the response signal transmitted from the first detection-side transmitting unit of the voltage detection device, and a serial connection based on the response signal received by the monitoring-side receiving unit. And a failure detection means for identifying a failure location in the plurality of voltage detection devices connected to the battery.

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