JP2018143014A - Secondary battery system and vehicle system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a secondary battery system which can detect not only abnormality of contactors but also abnormality of a control circuit and can identify a failure portion.SOLUTION: A secondary battery system 1000 comprises: a secondary battery 100; contactors 200a to 200c for conducting or interrupting power supply between the secondary battery and a load 110; and coils 300a to 300c for driving the contactors. The system also comprises a battery control section 400 for diagnosing a failure of a contactor circuit section from drivers 310a to 310c for driving the contactors to the contactors on the basis of open/close command signals 120a to 120c of the contactors, voltage values and current values of the coils and a voltage value of a high voltage side of the contactors.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a secondary battery system using a secondary cell and a vehicle system using the same.

A secondary battery is used in an electric vehicle such as a hybrid electric vehicle (HEV) or an electric vehicle (EV), and a DC output from the secondary battery is converted into an AC by an inverter to drive an AC motor. In such an electric drive system, the contactor is connected to a high voltage circuit that connects the secondary battery and the positive and negative electrodes of the inverter.

  This contactor has a role of connecting or disconnecting the secondary battery and the inverter by opening and closing, and is often used in handling a secondary battery in which high safety is regarded as important. Further, in order to ensure safety, points to be considered when using a secondary battery are overcharge and overdischarge. In order to prevent these problems, unnecessary charging / discharging of the secondary battery must be avoided. If the contactor fails and the connection between the secondary battery and the inverter becomes uncontrollable, factors that cause unnecessary charging / discharging. It becomes. Therefore, in order to confirm that the control of the contactor is appropriately performed, a failure diagnosis of the contactor is performed.

  Patent Document 1 includes a positive contactor, a precharge contactor, a negative contactor, and control means for controlling an opening / closing command of each contactor, and measures voltage fluctuation on the load side (high voltage side) accompanying opening / closing of the contactor. By doing so, contactor welding diagnosis is carried out.

JP2013-169087A

  Unnecessary charging / discharging of the secondary battery causes overcharging and overdischarging. Therefore, it is required to reliably conduct and shut off the secondary battery and the load by the contactor. However, according to the content described in Patent Document 1, it is impossible to make a diagnosis such as a ground fault, a power fault, a disconnection, a driver open fault, or a driver short fault.

  Therefore, in the present invention, by increasing the number of items to be measured and increasing the number of diagnostic items, it is possible to detect an abnormality as soon as possible, to detect not only a contactor abnormality but also a control circuit abnormality, and further, it is possible to identify a failure part. It is an object to provide a secondary battery system.

  In the present invention, in order to solve the above problems, the secondary battery system (1000) of the present invention conducts or cuts off the power supply between the secondary battery (100) and the secondary battery and the load (110). A contactor (200) and a coil (300) for driving the contactor (200) are provided. The contactor (200) opening / closing command signal (120), the voltage value and current value of the coil (300), and the contactor (200) A battery control unit (400) that performs failure diagnosis of the contactor circuit unit from the driver (310) that drives the contactor (200) to the contactor (200) based on the voltage value on the high voltage side is provided.

  By applying the present invention, not only a contactor abnormality but also a control circuit abnormality can be detected, and a failure part can be specified, thereby improving the reliability of the secondary battery system.

The figure explaining the vehicle system which concerns on this invention. The figure explaining the voltage detection apparatus which concerns on this invention. The failure mode determination figure at the time of diagnosing based on the voltage value of the contactor 200, and the electric current value of the coil 300. FIG. The failure mode determination figure at the time of diagnosing based on the voltage value of the contactor 200, and the voltage value of the coil 300. FIG. The failure mode determination figure at the time of using this invention.

  Hereinafter, an embodiment of an assembled battery according to the present invention will be described with reference to the drawings.

Embodiment 1
First, the secondary battery system 1000 of the present invention will be described with reference to FIG. The high voltage secondary battery 100 is a device that stores electric power necessary for driving an automobile, and is configured by connecting a plurality of secondary battery cells in series. The load 110 is a system that consumes the electric power stored in the high-voltage secondary battery 100, and in the present embodiment, it is assumed that an inverter is connected to lead to a motor. In addition, when the load 110 is assumed as in the present embodiment, not only the power stored in the high voltage secondary battery 100 is consumed, but also the role of regenerating power in the high voltage secondary battery 100 is provided.

  The contactor 200 conducts and shuts off the exchange of power between the high-voltage secondary battery 100 and the load 110. The contactor 200 is opened and closed to open and close. The contactor 200 includes a positive electrode contactor 200a and a precharge contactor 200b connected to the positive electrode side of the high voltage secondary battery 100, and a negative electrode contactor 200c connected to the negative electrode side.

  The contactor control circuit is responsible for the opening and closing operation of the contactor 200, and includes a contactor driving power supply 140, a coil 300, and a contactor driver 310. The contactor 200 is opened and closed by controlling the current flowing through the coil 300. The positive contactor 200a is driven by controlling the current of the coil 300a, the precharge contactor 200b is controlled by the coil 300b, and the negative contactor 200c is controlled by controlling the current of the coil 300c.

  The current flowing through the coil 300 is controlled by changing the output voltage 150 of the contactor driver 310 in accordance with ON / OFF of the contactor opening / closing command signal 120 output from the MPU 130. The current flowing through the coil 300a is controlled by changing the output voltage 150a of the positive contactor driver 310a in accordance with ON / OFF of the contactor opening / closing command signal 120a output from the MPU 130. The current flowing through the coil 300b is controlled by changing the output voltage 150b of the precharge contactor driver 310b in accordance with ON / OFF of the contactor opening / closing command signal 120b output from the MPU 130. The current flowing through the coil 300c is controlled by changing the output voltage 150c of the negative contactor driver 310c in accordance with ON / OFF of the contactor opening / closing command signal 120c output from the MPU 130.

  Prior to this, the output voltage 150 (150a, 150b, 150c) of the contactor driver 310 is set as the voltage value of the coil 300.

  Next, the voltage detection device 400 of the present invention will be described with reference to FIG. A circuit from the secondary battery 100 to the load 110 in the secondary battery system 1000 shown in FIG. 1 includes a voltage detection device (Battery Management System, BMS in the drawing) 400 as shown in FIG. The voltage value of the secondary battery 100 is detected by the detection device 400a, the positive contactor voltage detection device 400b, and the negative contactor detection device 400c.

  Since the total voltage detection device 400a is always connected to the positive electrode side and the negative electrode side of the secondary battery 100, the voltage value of the secondary battery 100 can always be detected.

  Since the positive electrode contactor voltage detection device 400b is connected to the positive electrode side and the negative electrode side of the secondary battery 100 when the positive electrode contactor 200a or the precharge contactor 200b is closed, the voltage value of the secondary battery 100 can be detected. If the positive electrode contactor 200a and the precharge contactor 200b are opened, the voltage value of the secondary battery 100 cannot be detected because it is not connected to the positive electrode side of the secondary battery 100.

  Since the negative electrode contactor voltage detection device 400c is connected to the positive electrode side and the negative electrode side of the secondary battery 100 when the negative electrode contactor 200c is closed, the voltage value of the secondary battery 100 can be detected. If the negative electrode contactor 200c is open, it is not connected to the negative electrode side of the secondary battery 100, so the voltage value of the secondary battery 100 cannot be detected.

  Prior to this, the voltage detected by the positive contactor voltage detection device 400b and the negative contactor voltage detection device 400c is used as the voltage value of the contactor 200.

  FIG. 3 shows a failure mode determination table when diagnosing based on the voltage value of the contactor 200 and the current value of the coil 300, and FIG. 4 is when diagnosing based on the voltage value of the contactor 200 and the voltage value of the coil 300. The failure mode judgment table of is shown. 3 and 4 show a determination method according to the conventional method. In FIG. 3 and subsequent figures, any contactor (positive contactor 200a, precharge contactor 200b, negative electrode contactor 200c) is determined in the same manner, and therefore, the contactor 200 will be collectively described.

  The vertical axis 500s in the table are failure modes to be diagnosed, and each failure mode is shown below.

  Normal 500: The contactor 200 can be appropriately operated according to the contactor opening / closing command signal 120.

  Ground fault 510: A failure (harness failure) in which the path from the contactor driver 310 to the contactor coil 300 is in a ground fault state, and the voltage of the corresponding path becomes low, so that the contactor 200 is always in a closed state.

  Skyline 520: A failure (harness) in which the path from the contactor driver 310 to the contactor coil 300 becomes a skyline state, and the voltage of the path becomes the voltage value of the contactor driving power supply 140, so that the contactor 200 is always in an open state. Malfunction).

  Disconnection 530: A failure (harness failure) in which the contactor control circuit is disconnected and no current flows through the coil 300, so that the contactor 200 is always in an open state.

  Driver release failure 540: The contactor driver circuit 310 is released, and the output voltage 150 (150a, 150b, 150c) of the contactor driver 310 is always the voltage value of the contactor drive power supply 140. A failure in which the contactor 200 is always in an open state (driver failure).

  Driver short-circuit fault 550: The contactor driver circuit 310 is short-circuited, and the output voltage 150 of the contactor driver 310 is always low. A failure (driver failure) in which the contactor 200 is always in a closed state.

  Contactor welding 560: A failure (contactor failure) in which the contactor 200 is welded and is always in a closed state.

  The horizontal axis is a measurement item used for diagnosis, and the state of each measurement item is shown below.

  Further, the ON state of the contactor opening / closing command signal 120 means a contactor close request, and the OFF state means a contactor open request. The actual contactor operation in response to these requests is the state of the contactor 200 in FIG. The voltage value of the contactor 200 changes in accordance with the state of the contactor 200. When the contactor 200 is closed, the total voltage is detected because the contactor 200 is connected to the high voltage secondary battery 100, and when the contactor 200 is open, the high voltage 2 Since the secondary battery 100 is disconnected, the voltage is Low (value close to 0 [V]). In addition, the current value of the coil 300 and the voltage value of the coil 300 indicate values measured in the respective failure modes.

  The failure modes 500 to 560 are diagnosed based on the state of each measurement item shown in FIGS.

  In the diagnosis based on the voltage value of the contactor 200 and the current value of the coil 300 shown in FIG. 3, regardless of the contactor opening / closing command signal 120, the voltage value on the high potential side of the contactor 200 and the coil 300 Since the measurement result of the current value is the same, it cannot be determined. In the diagnosis based on the voltage value of the contactor 200 and the voltage of the coil 300 shown in FIG. 4, regardless of the contactor opening / closing command signal 120, the voltage of the contactor 200 in the ground fault and the driver short circuit fault, the power fault and the driver open fault Since the value and the measurement result of the current value of the coil 300 are the same, it cannot be determined. Therefore, in the conventional method, it cannot be determined whether the state is a ground fault, a driver short circuit fault, a power fault, a driver open fault, a disconnection, or a contactor welding.

  On the other hand, if the method of this invention is used, it can be determined whether it is a ground fault, a driver short circuit fault, a power fault, a driver open fault, a disconnection, and a contactor welding. FIG. 5 is a table showing the results using the detection method of the present invention. The detection method of the present invention detects contactor failure using all of the voltage value of the contactor 200, the current value of the coil 300, and the voltage value of the coil 300.

  Each failure mode shown in FIG. 5 is the same as the failure mode described in FIGS. 3 and 4. Similar to FIGS. 3 and 4, failure modes 500 to 560 are diagnosed based on the state of each measurement item shown in FIG.

As described above, when each failure mode is detected by the voltage value of the contactor 200 and the current value of the coil 300, the failure mode of the disconnection 530 and the failure of the driver open failure 540 regardless of whether the contactor opening / closing command signal 120 is ON or OFF. Since the mode is determined to be the same, the disconnection 530 and the driver open failure 540 could not be distinguished. On the other hand, when each failure mode is detected by the voltage value of the contactor 200 and the voltage value of the coil 300, the failure mode of the ground fault 510 and the failure of the driver short-circuit failure 550 regardless of whether the contactor opening / closing command signal 120 is ON or OFF. Mode, the failure mode of the power fault 520 and the failure mode of the driver open fault 540 are determined to be the same, so that the fault modes of the ground fault 510 and the driver short fault 550 and the power fault 520 and the driver open fault 540 can be distinguished from each other. There wasn't.

  On the other hand, by combining measurement items as in the present invention (diagnosis is performed using all of the voltage values of the contactor 200, the voltage value of the coil 300, and the current value of the coil 300 as the measurement items), Since the combinations of the voltage of the contactor 200, the current value of the coil 300, and the voltage value of the coil 300 are all different, it becomes possible to diagnose all failure modes. Therefore, it is possible to make a more detailed diagnosis than the conventional method. Further, if the failure mode can be specified as in the present invention, there are the following advantages.

  (1) If the failure of the contactor driver and the failure of the control circuit cannot be distinguished, it is necessary to replace both the contactor driver and the control circuit when a failure occurs, and the cost increases. Therefore, by applying the present invention, it is possible to specify the failure mode by specifying the failure mode, and there is an advantage that the number of parts to be replaced at the time of repair is reduced.

  (2) In the conventional literature, the input used for diagnosis is only the voltage value on the high voltage side. However, if this voltage measurement system is abnormal, the diagnosis becomes impossible. On the other hand, if a voltage system and a current system are used in the measurement system as in the present invention, there is an item that can be diagnosed only by the other measurement system even if an abnormality occurs in either one of the measurement systems. improves.

  The present invention will be briefly described above. A vehicle system of the present invention includes a secondary battery (100), a load (110), a contactor (200) that conducts or cuts off power supply between the secondary battery (100) and the load (110), and a contactor. A coil (300) for driving (200), an open / close command signal (120) of the contactor (200), a voltage value and a current value of the coil (300), and a voltage value on the high voltage side of the contactor (200). Based on this, failure diagnosis of the contactor circuit section from the driver (310) that drives the contactor (200) to the contactor (200) is performed. By adopting such a configuration, the combinations of the voltage of the contactor 200, the current value of the coil 300, and the voltage value of the coil 300 in each diagnosis item are all different, so that all failure modes can be diagnosed. Become. Therefore, not only the abnormality of the contactor but also the abnormality of the control circuit can be detected, and furthermore, a vehicle system and a secondary battery system capable of specifying the failed part can be provided.

  Further, the secondary battery system (1000) of the present invention includes a secondary battery (100), a contactor (200) that conducts or cuts off power supply between the secondary battery and the load (110), and a contactor (200). ), And a voltage value and a current value of the coil (300), and a voltage value on the high voltage side of the contactor (200). A battery control unit (400) that performs failure diagnosis of the contactor circuit unit from the driver (310) that drives the contactor (200) to the contactor (200). Thus, the form of a secondary battery system may be taken. Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. Furthermore, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

100 Secondary battery 110 Load 120 Contactor open / close command signal 130 MPU
140 Contactor drive power supply 150 Output voltage 200 Contactor 300 Coil 400 Voltage detector 1000 Secondary battery system

Claims (2)

In a vehicle system comprising: a secondary battery; a load; a contactor that conducts or cuts off power supply between the secondary battery and the load; and a coil that drives the contactor.
Based on the contactor open / close command signal, the voltage value and current value of the coil, and the voltage value on the high voltage side of the contactor, failure diagnosis of the contactor circuit section from the driver that drives the contactor to the contactor is performed. A vehicle system characterized by this. In a secondary battery system comprising: a secondary battery; a contactor that conducts or cuts off power supply between the secondary battery and a load; and the coil that drives the contactor.
A battery that performs failure diagnosis of the contactor circuit unit from the driver that drives the contactor to the contactor based on the contactor open / close command signal, the voltage value and current value of the coil, and the voltage value on the high voltage side of the contactor A secondary battery system comprising a control unit.

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