JP6247460B2 - Battery control device - Google Patents

Description

  The present invention relates to a battery controller for an assembled battery capable of being charged and discharged.

  A battery module mounted on a hybrid vehicle or an electric vehicle is managed by a battery control device including a plurality of nickel metal hydride batteries or lithium ion batteries. The battery control device has a self-diagnosis function that constantly monitors the temperature, voltage, deterioration state, etc. of the battery and detects when there is an abnormality. When the abnormality is detected, the battery control device performs control for protecting the safety of the battery such as prohibiting charging / discharging of the battery depending on the content of the abnormality. Furthermore, the type of abnormality that occurred and the various battery states at the time of the abnormality are recorded as failure information in a nonvolatile area in the battery control device, the battery control device is collected, the recorded content is read, and the recorded failure information In addition, the failure diagnosis of the battery is performed and the cause of the failure is analyzed.

  For example, there is a current sensor failure diagnosis device that detects a charge / discharge current of a battery and diagnoses an output sticking abnormality in which an output of a current sensor that outputs a voltage value corresponding to a detected current value is fixed. (Patent Document 1)

Japanese Unexamined Patent Publication No. 2007-024825

  However, the self-diagnosis function performs processing to write the failure type and failure information at the time of occurrence to the nonvolatile memory, but when a failure occurs and the battery control device is restarted, the same failure occurs each time. In other words, the same failure information is recorded, or the failure information of the abnormality that occurs subordinately with the abnormality that occurred at the time of activation is recorded, so that there is a problem that the area of the nonvolatile memory is occupied.

  The battery control device according to claim 1, a startup number counting unit that counts the number of startups each time the battery control device is started, a diagnostic processing unit that acquires a state of the battery module and executes diagnosis, and startup A storage unit that stores the number of activations by the number counting unit, the previous failure information obtained by the previous diagnosis by the diagnosis processing unit and the current failure information obtained by the current diagnosis, and the diagnosis by the diagnosis processing unit reveals an abnormality. The failure information is not the same as the previous failure information stored in the storage unit, and the diagnosis by the diagnosis processing unit is performed for the first time after the battery control device is activated based on the number of activations. A discriminating unit for discriminating whether the diagnosis is a diagnosis unit, and a control unit that stores the current fault information in the storage unit when the discriminating unit determines that the diagnosis is not the same as the previous fault information but is the first diagnosis after startup. Preparation It is characterized in.

  According to the present invention, failure information useful for failure diagnosis can be preferentially left.

It is a figure which shows the whole system structure concerning one Embodiment. It is a figure which shows the memory content of a non-volatile memory and a safety protection diagnostic process part. It is a flowchart of diagnostic recording.

  An embodiment of a battery control device according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing an overall system configuration of the battery control apparatus. The overall system configuration will be described below based on FIG.

  The battery control device 100 manages and controls the battery module 300 via the cell controller 200, receives the voltage, current, temperature, and the like of the battery module 300 input from the cell controller 200, and executes safety protection diagnosis processing and the like. . And a signal is exchanged between the vehicle control apparatuses 400.

  The battery control device 100 includes a basic processing unit 110, an input processing unit 120, an output processing unit 130, an application processing unit 140, and a nonvolatile memory 150.

  The basic processing unit 110 includes a start / stop sequence processing unit 111. The start / stop sequence processing unit 111 starts a start / stop process of the battery control device 100 or requests a battery control device when a start / stop request is made. For example, flag information such as 100 control preparation completion is output to the vehicle control device 400 or a motor controller (not shown).

  The input processing unit 120 includes an A / D input processing unit 121, an I / O input processing unit 122, a CC communication input unit 123, and a CAN (Controller Area Network) communication input unit 124.

  The A / D input processing unit 121 reads the total battery voltage, the battery current, the battery temperature, and the like input from the cell controller 200, performs A / D conversion, and outputs a digital value.

  The I / O input processing unit 122 determines the level (High or Low) of the overvoltage input signal input from the FF signal line of the cell controller 200 (1-bit signal transmission line connecting the FFI and FFO terminals of the cell controller IC). Read.

  The CC communication input unit 123 sends a command signal to the communication line of the cell controller 200 (multi-bit signal transmission line connecting the RX and TX terminals of the cell controller IC). Read flag. The abnormality flag is a flag that is set in the cell controller IC when the battery is overcharged (overvoltage), overdischarged, circuit abnormality, or the like.

  The CAN communication input unit 124 communicates with the vehicle control device 400 connected to the CAN and other control units (not shown), and requests for start / stop from the vehicle control device 400, such as an ignition switch signal, a relay from the motor controller. Receive information.

  The output processing unit 130 includes an I / O output processing unit 131, a CC communication output unit 132, and a CAN communication output unit 133.

  The I / O output processing unit 131 outputs a fan control signal, a leak detection signal, a relay cut signal, and an overvoltage output signal. The leak detection signal is an AC input signal (pulse signal) used when a leak is detected in the leak detection device provided in the battery control device 100. The relay cut signal is normally controlled by the motor controller, but is a signal for forcibly turning off the relay from the battery control device 100 in an emergency such as overvoltage. The overvoltage output signal is a 1-bit test signal output to the FF signal line, and is a signal for detecting disconnection of the FF signal line.

  The CC communication output unit 132 outputs a signal for controlling battery capacity adjustment to the command signal line of the cell controller 200.

  The CAN communication output unit 133 is a part that communicates with a control unit connected to the CAN, and outputs a status flag to the vehicle control device 400 and the motor controller. Further, battery information such as SOC (State Of Charge), SOH (State Of Health), allowable charge / discharge power or current is output. The status flag is a signal based on the self-diagnosis result of the battery control device 100. The flag relating to the relay cut request in the case of severity 1 described later, the flag relating to the charge / discharge prohibition request in the case of severity 2, and the severity 3 Is a flag related to alarm notification.

  The application processing unit 140 includes a battery information calculation processing unit 141 and a safety protection diagnosis processing unit 142.

  The battery information calculation processing unit 141 calculates values indicating the state of various batteries such as the SOC and SOH of the battery from the acquired battery state. Specifically, each of the battery total voltage, the battery current, and the battery temperature from the parameter information that holds the battery characteristic table and that is input from the A / D input processing unit 121 regarding the battery total voltage, the battery current, and the battery temperature. Calculation, SOC calculation, battery output (power) calculation, allowable charge / discharge power calculation for controlling battery charge / discharge, and SOH calculation.

  The safety diagnosis processing unit 142 performs self-diagnosis based on the statuses indicating various battery states acquired from the I / O input processing unit 122 and the battery information calculation processing unit 141, and stores failure information and the like in the nonvolatile memory 150. To do. Specifically, various sensors such as total voltage measurement circuit, current sensor, temperature sensor, FF signal line, A / D converter, leak detector, fan, memory, relay contact welding Diagnosis of driving, CAN communication, etc. In addition, when the diagnosis result is a diagnosis abnormality which will be described later, the status flag is set or output based on the abnormality diagnosis result such as the abnormality diagnosis of the balancing switch of the cell controller 200, the disconnection diagnosis of the sensing line, or the CC communication error, and the relay cut control. Etc.

  As will be described later, the non-volatile memory 150 stores failure information 1 to N such as total battery voltage, temperature, SOC, SOH, and the like when a diagnosis abnormality occurs, and a diagnosis code, and each time the battery control device 100 is activated. The lifetime BCU activation count accumulated in is stored as the activation count. Further, the diagnostic code at the time of the previous occurrence and the number of activations at that time are stored.

  The cell controller 200 detects various statuses relating to the state of the battery, such as the total voltage of the battery module 300, the single cell voltage in the battery module 300, and some temperatures of all the single cells in the battery module 300.

  The battery module 300 is composed of a plurality of single cells. The case where a lithium ion battery is employed as the battery module 300 will be described as an example, but other storage batteries such as a nickel metal hydride battery, a lead battery, an electric double layer capacitor, and a hybrid capacitor can be used.

  The vehicle control device 400 is connected to the battery control device 100 and is notified from the CAN communication output unit 133 that a diagnosis abnormality has been found, and the abnormality found by the diagnosis by the safety protection diagnosis processing unit 142 is detected by the battery control device 100. In the case of an error that may damage the battery, failure information is transmitted from the battery control device 100 and stored in a nonvolatile memory in the vehicle control device 400.

An outline of the operation of the overall system configuration shown in FIG. 1 will be described below.
The cell controller 200 detects the battery state such as the total voltage of the battery module 300, the single cell voltage in the battery module 300, and the temperature of some of all the single cells in the battery module 300. Various statuses regarding the state of the battery detected by the cell controller 200 are input to the battery control apparatus 100. Various statuses regarding the state of the battery are sent to the battery information calculation processing unit 141 and the safety protection diagnosis processing unit 142 through the A / D input processing unit 121 and the I / O input processing unit 122 in the battery control apparatus 100. The battery information calculation processing unit 141 calculates values indicating the state of various batteries such as the SOC and SOH of the battery from the acquired battery state.

  The safety protection diagnosis processing unit 142 performs self-diagnosis based on the statuses indicating various states of the battery acquired from the I / O input processing unit 122 and the battery information calculation processing unit 141. When a diagnostic abnormality is detected by performing self-diagnosis, the safety protection diagnostic processing unit 142 stores various statuses relating to the state of the battery at the time of occurrence of the diagnostic abnormality, such as failure information, in the nonvolatile memory 150. Further, using CAN communication, the vehicle control apparatus 400 is notified that a diagnosis abnormality has been found, and the vehicle control apparatus 400 that has recognized the occurrence of the battery abnormality issues a shutdown request to the battery control apparatus 100 from the CAN communication input unit 124. . The shutdown request input from the CAN communication input unit 124 may be input to the start / stop sequence processing unit 111 of the basic processing unit 110 to stop the battery control system of the battery control device 100 and stop using the battery. it can.

FIG. 2 is a diagram illustrating the storage contents of the nonvolatile memory 150 and the safety protection diagnosis processing unit 142.
The nonvolatile memory 150 stores a plurality of pieces of failure information and diagnosis codes including total battery voltage, temperature, SOC, SOH, etc. when a diagnosis abnormality occurs. The failure information includes information for specifying the cause of the abnormality later. The diagnostic code will be described later. Further, the lifetime BCU activation count accumulated every time the battery control device 100 is activated is stored as the activation count. Further, the diagnosis code found last time is stored as failure information at the time of previous occurrence.

  The safety protection diagnosis processing unit 142 stores the diagnosis code and the severity in association with each other in the diagnosis code table 143. Specifically, battery temperature heating diagnosis abnormality: severity 1, battery overvoltage diagnosis abnormality: severity 1, battery overcurrent diagnosis abnormality: severity 1, battery overdischarge diagnosis abnormality: severity 2, battery FAN Abnormal rotation diagnosis: Severity 3 is stored.

  Here, the severity 1 indicates that the diagnosis result is an operation stop level at which the operation cannot be continued. For example, the battery information of the battery cannot be detected correctly, or there is a possibility that the battery or other equipment may be damaged. This is a case where the device 100 or the like may be damaged. In this case, the relay is cut off, and the electrical connection between the battery and the inverter is disconnected. Severity 2 indicates an overcharge / discharge suppression level, prohibits charging / discharging of the battery, and returns depending on conditions. Severity 3 indicates a battery management level that has little influence on driving, and detects a failure and notifies it with an alarm, reduces the amount of current supplied to the battery, or cools the battery.

  The diagnosis code includes battery temperature heating diagnosis abnormality, battery overvoltage diagnosis abnormality, battery overcurrent diagnosis abnormality, battery overdischarge diagnosis abnormality, battery FAN rotation diagnosis abnormality, and the like. The battery temperature heating diagnosis abnormality is when the battery temperature is heated to a predetermined threshold value or more. The battery overvoltage diagnosis abnormality is when the battery voltage is equal to or higher than a predetermined threshold. The battery overcurrent diagnosis abnormality is when the battery current is equal to or greater than a predetermined threshold. The battery overdischarge diagnosis abnormality is a case where the battery is overdischarged exceeding a predetermined threshold. The battery FAN rotation diagnosis abnormality is a case where the battery FAN rotation speed is not within a normal value range. The determination of voltage (overcharge) and overdischarge may be based on a comparison determination between the total battery voltage and the corresponding threshold value, or on a comparison determination between the cell voltage in the cell controller 200 and the corresponding threshold value. If any one of them is found to be abnormal, it is determined as abnormal.

  FIG. 3 is a flowchart of diagnostic recording executed after error detection. The operation of the embodiment of the present invention will be described below with reference to this flowchart.

  When the ignition switch is turned on, the battery control device 100 is activated and the safety protection diagnosis processing unit 142 periodically executes self-diagnosis. Each time the battery control device 100 is activated, the number of activations is accumulated, and the lifetime BCU activation number is stored in the nonvolatile memory 150 as the activation number. When an abnormality is detected in the self-diagnosis periodically performed by the safety protection diagnosis processing unit 142, the diagnosis record shown in FIG. 3 is executed by the safety protection diagnosis processing unit 142.

  In step S1, it is determined whether the abnormality that occurred this time is the same as the abnormality that occurred last time, that is, whether it is the same diagnostic code as the previous time. The diagnostic code generated last time is recorded in the area 152 of the nonvolatile memory 150 when an abnormality is detected last time. Further, when an abnormality is detected in the previous time, the number of times of activation stored in the area 151 of the nonvolatile memory 150 as the number of times of activation is stored in the area 152 as the number of times of activation at the previous occurrence. If the current diagnostic code is the same as the previous diagnostic code in step S1, the failure information is discarded in step S2 and the diagnostic recording flowchart is terminated.

  If the current diagnostic code is different from the previous diagnostic code in step S1, the next step S3 is executed. In step S <b> 3, it is determined whether the abnormality has occurred for the first time after the battery control device 100 is activated. That is, if the number of times of activation at the time of the previous occurrence recorded in the area 152 of the non-volatile memory 150 is the same as the number of times of activation stored in the area 151 of the non-volatile memory 150, In step S5, it is determined whether there is a free area in the area 153 of the nonvolatile memory 150. If there is no free area, in step S2, the failure information is discarded and the diagnostic recording flowchart is terminated. If there is a free area, the failure information and the diagnostic code are recorded in the area 153 of the nonvolatile memory 150 in the process of step S6, and the diagnostic recording flowchart ends.

  In step S3, if the number of times of activation at the time of the previous occurrence recorded in the area 152 of the nonvolatile memory 150 is different from the number of activations stored in the area 151 of the nonvolatile memory 150, an abnormality that has occurred for the first time in the current activation Therefore, the process of the next step S4 is executed.

  In step S4, the current diagnosis code is checked against the diagnosis code table 143 in the safety protection diagnosis processing unit 142 to determine whether the severity is high. In this example, when the severity is 1, it is determined that the severity is high. As a result of the determination in step S4, when the severity is not high, for example, in the case of severity 2 and severity 3, it is determined in the process of step S5 whether there is an empty area in the area 153 of the nonvolatile memory 150. . If there is no free area, in step S2, the failure information is discarded and the diagnostic recording flowchart is terminated. If there is a free area, the failure information and the diagnostic code are recorded in the area 153 of the nonvolatile memory 150 in the process of step S6, and the diagnostic recording flowchart ends.

  In step S4, the current diagnosis code is checked against the diagnosis code table 143 in the safety protection diagnosis processing unit 142. If it is determined that the severity is high, the process of step S7 is performed. In step S7, it is determined whether there is a free area in the area 153 of the nonvolatile memory 150. If there is a free area, failure information and a diagnostic code are recorded in the area 153 of the nonvolatile memory 150 in the process of step S8. .

  If there is no free space in the area 153 of the nonvolatile memory 150 in the process of step S7, the process of step S9 is performed. In the process of step S9, diagnostic codes already recorded in the area 153 of the non-volatile memory 150 are sequentially read, and failure information with low severity is searched with reference to the diagnostic code table 143. In step S10, the current failure information and diagnostic code are overwritten and recorded in the area 153 of the nonvolatile memory 150 in which failure information with low severity is recorded. After the process of step S10 or after the process of step S8, the process of step S11 is performed.

  In step S11, it is determined whether there is an abnormality that may damage the battery control device 100 or the like based on the current failure information or diagnostic code. For example, in the case of severity 1, it is determined that there is a possibility of damage, and in the process of the next step S12, the current failure information and diagnosis code are sent to the vehicle control device 400, and the nonvolatile information in the vehicle control device 400 is sent. Stored in the memory. Although the failure information and diagnostic code are sent to the vehicle control device 400, they may be sent to other controllers in the vehicle and stored in the controller. In step S11, if there is no possibility of damaging the battery control device 100 or the like based on the current failure information or diagnostic code, the diagnostic recording flowchart is terminated.

(Modification)
The present invention can be implemented by modifying the embodiment described above as follows.
(1) When an abnormality that may damage the battery control device 100 or the like is detected, the current failure information and diagnostic code are sent to the vehicle control device 400 and other controllers for storage. The failure information and the diagnostic code may be transmitted outside the vehicle system by the wireless communication of the unit and stored in the storage area of the storage unit outside the vehicle system. The term “outside the vehicle system” refers to, for example, a server device connected by wireless communication, and the server device can be used instead of the vehicle control device 400 in FIG.

(2) If there is no free space in the area 153 of the non-volatile memory 150, the process of step S9 is performed, and the diagnostic codes already recorded in the area 153 of the non-volatile memory 150 are sequentially read and referred to the diagnostic code table 143. In step S10, the failure information with the low severity and the failure information with the low severity are recorded in the area 153 of the nonvolatile memory 150 where the failure information and the diagnostic code are overwritten. However, if the area 153 of the nonvolatile memory 150 in which failure information with low severity is recorded is not searched, the old failure information may be overwritten and recorded. Or when the area | region 153 of the non-volatile memory 150 in which failure information with low severity is recorded is not searched, you may alert | report warning information so that a vehicle may be maintained.

The battery control device according to the above embodiment has the following effects.
(1) Every time the battery control device 100 is activated, the number of activations is counted, the state of the battery module 300 is acquired and diagnosis is performed, and the number of activations and the previous failure information generated by the safety protection diagnosis processing unit 142 are detected. The current failure information generated this time is stored in the nonvolatile memory 150, and when an abnormality is found by the diagnosis by the safety protection diagnosis processing unit 142, the current failure information of the abnormality is stored in the nonvolatile memory 150 in the previous failure. It is determined that the diagnosis is not the same as the information, and whether or not the diagnosis by the nonvolatile memory 150 is the first diagnosis after the battery control device 100 is started based on the number of activations. When it is determined that the diagnosis is the first time, the failure information is stored in the nonvolatile memory 150 this time. Accordingly, when a failure occurs, the battery control device 100 is restarted, and the same failure information is not recorded every time the same failure occurs. Thus, the failure information of the abnormally generated abnormality is not recorded, and failure information useful for failure diagnosis can be preferentially left in the nonvolatile memory 150.

(2) It is determined whether the abnormality found by the diagnosis by the safety protection diagnosis processing unit 142 is a serious error, and the current failure information determined to be a serious error is preferentially stored in the nonvolatile memory 150. Thus, useful failure information can be preferentially left in the nonvolatile memory 150 by failure diagnosis.

(3) Further, a serious error is discriminated into a plurality of stages of errors according to the degree of abnormality that has occurred, and according to a plurality of stages of error, the current failure information is an error at a stage where the degree of abnormality that has occurred is low. Therefore, failure information related to a serious error that is useful for failure diagnosis can be left in the nonvolatile memory 150 with priority.

(4) When the abnormality that has occurred in the diagnosis by the safety protection diagnosis processing unit 142 is an error that may damage the battery control device 100, the current failure information is stored in the storage unit of the vehicle control device 400. Therefore, even if the battery control device 100 is damaged and failure information cannot be read from the nonvolatile memory 150, the failure can be diagnosed by reading it from the storage unit of the vehicle control device 400.

(5) When the abnormality that has occurred in the diagnosis by the safety protection diagnosis processing unit 142 is an error that may damage the battery control device 100, the current failure information is output to the outside of the vehicle via the communication unit, Since it is stored in the storage unit outside the vehicle, even if the battery control device 100 is damaged and failure information cannot be read from the nonvolatile memory 150, the failure diagnosis is performed by reading from the storage unit outside the vehicle. Is possible.

  The present invention is not limited to the above-described embodiment, and other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention as long as the characteristics of the present invention are not impaired. It is.

DESCRIPTION OF SYMBOLS 100 Battery control apparatus 110 Basic processing part 120 Input processing part 130 Output processing part 140 Application processing part 150 Non-volatile memory 200 Cell controller 300 Battery module

Claims (6)

An activation number counting unit that counts the number of activations each time the battery control device is activated; and
A diagnostic processing unit for acquiring a status of the battery module and executing a diagnosis;
A storage unit for storing the number of activations by the activation number counting unit, the previous failure information obtained by the previous diagnosis by the diagnosis processing unit, and the current failure information obtained by the current diagnosis;
When abnormality is found by the diagnosis by the diagnosis processing unit, it is determined that the current failure information of the abnormality is not the same as the previous failure information stored in the storage unit, and the diagnosis is performed based on the number of times of activation. A determination unit for determining whether the diagnosis by the processing unit is the first diagnosis after the battery control device is started, and
A battery control comprising: a control unit that stores the current failure information in the storage unit when the determination unit determines that the diagnosis is not the same as the previous failure information but the first diagnosis after startup apparatus. The battery control device according to claim 1,
The determination unit further determines whether the abnormality found by the diagnosis by the diagnosis processing unit is a serious error,
The battery control device, wherein the control unit preferentially stores the current failure information determined to be a serious error by the determination unit in the storage unit. The battery control device according to claim 2,
The discriminating unit discriminates the serious error into a plurality of stages of errors according to the degree of abnormality that has occurred,
The control unit stores the current failure information in the storage unit in preference to an error at a stage where the degree of abnormality is lower than the found abnormality in response to the plurality of stages of error. . In the battery control device according to any one of claims 1 to 3,
The determination unit further determines whether the abnormality found by the diagnosis by the diagnosis processing unit is an error that may damage the battery control device,
The control unit executes a process of storing the current failure information determined by the determination unit as an error that may be damaged in a storage unit of a vehicle control device provided outside the battery control device. A battery control device. In the battery control device according to any one of claims 1 to 3,
The determination unit further determines whether the abnormality found by the diagnosis by the diagnosis processing unit is an error that may damage the battery control device,
The battery control apparatus, wherein the control unit outputs the current failure information determined to be an error that may be damaged by the determination unit to the outside of the vehicle via a communication unit. In the battery control device according to any one of claims 1 to 5 ,
The battery control device, wherein the storage unit is configured by a nonvolatile memory.

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