JP5200598B2 - Secondary battery abnormality detection device - Google Patents

Description

  The present invention relates to an abnormality detection device for a secondary battery that requires a high voltage or a high capacity used for a backup power source for public relations or industrial relations.

As for conventional secondary battery abnormality detection, when water droplets from the outside or leakage occurs in the secondary battery, the conduction of the electrodes provided in the battery pack is used, or the secondary battery is provided. It was detected that a current flowed from the secondary battery to the temperature detection sensor. An example of a conventional secondary battery abnormality detection device 501 is shown in FIG. In FIG. 5, reference numeral 509 denotes a leakage detection circuit, which includes a current leakage detection electrode 510 and an electrode semiconductor switch 511. The current leakage detection electrode 510 is connected to the secondary battery 502, and when liquid adheres to the current leakage detection electrode 510, the electrode semiconductor switch 511 is turned on through the current leakage detection electrode 510 from the secondary battery 502 to charge the battery. An abnormality was detected by sending a signal to the semiconductor switch control circuit 506 and the discharging semiconductor switch control circuit 508. In FIG. 6, when the temperature sensor 611 is close to the battery 601 and liquid or the like adheres to the temperature sensor 611 and the secondary battery 601, current flows from the electrode of the secondary battery 601 to the temperature sensor 611, and current flows. And detecting an abnormality (see, for example, Patent Documents 1 and 2).
JP 2003-132862 A JP 2002-75465 A

  However, in the conventional secondary battery abnormality detection device, in order to improve the reliability, it is necessary to increase the number of current leakage detection electrodes and the number of temperature sensors and increase the number of detection points, and the configuration becomes complicated. Had problems. Moreover, in order to ensure the strength of the battery housing used at high voltage and high capacity, a metal housing is used, and when water drops etc. adhere to the metal housing and the electrode of the high voltage or high capacity battery, There is a danger of electric shock when current flows from the battery to the metal case or when a person comes in contact with the metal case, but in the conventional example, only the battery and its surroundings are detected, and the battery and metal case are important for safety. Detection of liquid adhesion was insufficient.

  In order to solve the above problems, an abnormality detection device for a secondary battery according to the present invention includes a secondary battery connected in multiple series or multiple parallels and a metal casing that insulates and covers the secondary battery. The GND of the transmitter is connected to the body, and the output of the transmitter is connected to a single or a plurality of series-connected capacitors, and the other end of the single or a plurality of series-connected capacitors is connected to the minus of the secondary battery. The negative of the secondary battery is connected through a metal casing and a capacitor, and one or more voltage waveforms or voltages of the single or plural capacitors connected in series are monitored by a detection circuit, and an initial value or standard An abnormality is determined when the value is different from the value.

  Also, connect the GND of the transmitter to the negative of the secondary battery connected in multiple series or multiple parallel, connect the negative and the metal housing with a capacitor, and connect the output of the transmitter in single or multiple series The other end of the single or plural capacitors connected in series to a metal casing, and one or more voltage waveforms or voltages of the single or plural capacitors connected in series. An abnormality can be determined by monitoring with a detection circuit.

In addition, there is an ECU that detects the state of the secondary battery. The ECU detects the voltage, current, and temperature of the secondary battery, grasps the state of the secondary battery, and outputs a signal from a microcomputer configured in the ECU. A rectangular wave is originally output, and the output is connected to a single or a plurality of series-connected capacitors, and one or more voltage waveforms or voltages of the single or a plurality of series-connected capacitors are connected to the ECU. An abnormality can be determined by monitoring the voltage waveform or voltage using a microcomputer.

  In addition, there is a charger for charging the secondary battery. The charger detects the voltage, current, and temperature of the secondary battery and charges the secondary battery, and also has a signal from a microcomputer configured in the charger. A rectangular wave is output to the capacitor, and the output is connected to the single or plural capacitors connected in series, and one or more voltage waveforms or voltages of the single or plural capacitors connected in series are connected to the charger. An abnormality can be determined by monitoring the voltage waveform or voltage using a microcomputer.

  According to the present invention, in a secondary battery covered with a metal casing, an abnormality can be easily detected when liquid or the like adheres to the secondary battery and the metal casing. When insulation is required to prevent electric shock in the meantime, it is possible to obtain a safe secondary battery abnormality detection device that easily detects abnormality at a low price.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram of a secondary battery abnormality detection apparatus according to an embodiment of the present invention. In FIG. 1, reference numeral 101 denotes a metal casing. Reference numerals 102a to 102i denote secondary batteries, which are connected in series. 103a and 103b are a plus terminal and a minus terminal, respectively, the plus terminal 103a is connected to the plus of the secondary battery 102a, and the minus terminal 103b is connected to the minus of the battery 102i.

  A transmitter 104 outputs a sine wave, a rectangular wave, or the like. The GND of the transmitter 104 is connected to the metal casing 101. Reference numerals 105 and 106 denote capacitors, which are connected in series. The other end of the capacitor 105 is connected to the transmitter 104, and the other end of the capacitor 106 is connected to the negative side of the secondary battery 102i. A capacitor 107 is connected to the minus of the secondary battery 102 i and the metal casing 101.

  A detection circuit 108 is connected to both ends of the capacitor 105 and detects a voltage or a waveform. Thus, when the amplitude of the transmission waveform of the transmitter 104 is Ev and the capacitance values of the capacitors 105, 106, and 107 are equal, the amplitude of the capacitor 105 is 1/3 of the amplitude Ev of the transmitter 104 in a normal state.

  As an abnormal state, for example, when water drops or the like adhere to the minus of the secondary battery 102 i and the metal casing 101, the impedance between the capacitors 107 becomes small, and the voltage across the capacitor 105 is 1 / of the amplitude Ev of the transmitter 104. Greater than 3. Further, if water droplets adhere to each secondary battery and the metal casing 101, the amplitude is larger than 1/3 of the amplitude Ev of the transmitter 104. The detection circuit 108 has a feature that the presence of an abnormality can be detected by detecting this voltage.

(Embodiment 2)
FIG. 2 is a block diagram of an abnormality detection device for a secondary battery according to Embodiment 2 of the present invention. Only differences from the first embodiment will be described.

In contrast to the first embodiment, the transmitter 104 is connected to the minus of the secondary battery 102 i and the other end is connected to the capacitor 106. The capacitor 105 is connected in series to the capacitor 106, and the other end is connected to the metal housing 101. The detection circuit 108 is connected to both ends of the capacitor 106 and measures a waveform or a voltage.

  The difference from Embodiment 1 is that the transmitter 104 and the detection circuit 108 are configured on the negative side of the secondary battery. As in the first embodiment, with this configuration, when liquid adheres to the secondary battery and the metal casing 101, the impedance between the negative terminal 103b and the metal casing 101 is reduced, and the voltage amplitude between the capacitors 106 is normal. As a result, the abnormality can be detected. For example, when the amplitude of the transmitter 104 is Ev and the capacities of the capacitors 105, 106, and 107 are equal, the voltage of each capacitor is equal to 1/3 times Ev in the normal state. Note that the capacitances of the capacitors 105, 106, and 107 are not necessarily the same, and the voltage corresponds to the size of the capacitance in a normal state. Since the voltage of the capacitor 107 decreases at the time of abnormality, the voltage of the capacitor 106 becomes larger than that at normal time.

(Embodiment 3)
FIG. 3 is a block diagram when combined with an ECU for detecting the state of the secondary battery in the second embodiment of the present invention. Only differences from the second embodiment will be described.

  An ECU 301 is connected to the power supply terminal 307 and is supplied with power. ECU 301 and signal output terminal 308 are connected, and information on secondary batteries 102 a to 102 i is sent from ECU 301 to signal output terminal 308. The ECU 301 detects the voltage of the secondary battery and sends a signal to the microcomputer 302. The battery voltage detection circuit 303 sends a signal to the microcomputer 302. The current detection circuit 304 detects the charging / discharging current to the secondary batteries 102a to 102i and sends the signal to the microcomputer 302. And a rectangular wave generation circuit 306 that receives a signal from the microcomputer 302 and outputs a rectangular wave, and a capacitor voltage detection circuit 305 that detects the voltage of the capacitor 106 and sends a signal to the microcomputer 302. The battery voltage detection circuit 303 and the charging current The detection circuit 304, the rectangular wave generation circuit 306, the capacitor voltage detection circuit 305, and the microcomputer 302 are connected separately. The ECU 301 detects the secondary battery voltage and the charging / discharging current, detects the state of the secondary batteries 102a to 102i, grasps the state of the secondary battery, and sends a signal to the signal output terminal 308. The signal at the signal output terminal 308 is sent to, for example, a host device (not shown) or a charger. When it is sent to the host device, it is notified that it is in an abnormal state, so that services and maintenance can be started in a short time to eliminate the abnormality. Moreover, when sent to a charger, since it is in an abnormal state, charging can be stopped immediately and safety can be improved.

  With this configuration, the rectangular wave generation circuit 306 is driven by a signal from the microcomputer 302, whereby a rectangular wave voltage is applied to the capacitors 106, 105, and 107, and the voltage of the capacitor 106 is detected by the capacitor voltage detection circuit 305. A signal is sent to 302. When normal, the rectangular wave voltage is divided by the capacitors 106, 105, and 107, and the voltage applied to the capacitor 106 when it is normal is detected. For example, if the capacitances of the capacitors 105, 106, and 107 are equal, 1/3 times the amplitude Ev output from the rectangular wave generation circuit 306 is detected by the capacitor detection circuit 305, and the microcomputer 302 grasps the normal state. On the other hand, when an abnormality occurs, for example, when water droplets or the like adhere to the secondary batteries 102a to 102i and the impedance between the secondary batteries 102a to 102i and the metal casing 101 decreases, the voltage of the capacitor 107 decreases, and at the same time, the voltage of the capacitor 106 Becomes larger. Since the voltage of the capacitor 106 is detected by the capacitor voltage detection circuit 305 and a signal is sent to the microcomputer 302, the microcomputer 302 can detect the abnormality by grasping the voltage change of the capacitor 106.

The microcomputer 302 that has detected the abnormal state in this way sends a signal to the signal output terminal 308. The signal at the signal output terminal 308 is sent to, for example, a host device (not shown) or a charger. When it is sent to the host device, it is notified that it is in an abnormal state, so that services and maintenance can be started in a short time to eliminate the abnormality. Moreover, when sent to a charger, since it is in an abnormal state, charging can be stopped immediately and safety can be improved.

(Embodiment 4)
FIG. 4 is a block diagram when combined with a charger for charging a secondary battery in the second embodiment of the present invention. Only differences from the second embodiment will be described.

  A charger 401 is connected to the power supply terminal 307 and supplied with power. The signal output terminal 308 and the charger 401 are connected, and charging abnormality information is sent from the charger 401 to the signal output terminal 308. Inside the charger 401, there are a converter 402 and a constant voltage regulator 403 connected to a power supply terminal 307, which are connected to the secondary batteries 102 a to 102 e, the microcomputer 302, etc. and supply power. Further, the charger 401 detects a secondary battery voltage and sends a signal to the microcomputer 302. A battery voltage detection circuit 303 sends a signal to the microcomputer 302, and detects a charge / discharge current to the secondary batteries 102a to 102e and sends a signal to the microcomputer 302. And a thermistor 404 that directly detects the temperature of the secondary batteries 102a to 102e, a temperature detection circuit 405 that sends a signal to the microcomputer 302, a rectangular wave generation circuit 306 that receives a signal from the microcomputer 302 and outputs a rectangular wave, and the capacitor 106 A capacitor voltage detection circuit 305 that detects the voltage of the battery and sends a signal to the microcomputer 302. The battery voltage detection circuit 303, the current detection circuit and the 304 temperature detection circuit 405, the rectangular wave generation circuit 306, the capacitor voltage detection circuit 305, the microcomputer 302, Are connected separately.

  The charger 401 detects the secondary battery voltage, charging / discharging current, and temperature, and detects the state of the secondary batteries 102a to 102e. The microcomputer 302 detects the current of the converter 402 connected to the secondary batteries 102a to 102e, The voltage is controlled to control charging of the secondary batteries 102a to 102e. When a charging abnormality occurs, a signal is sent to the signal output terminal 308. The signal at the signal output terminal 308 is sent to, for example, a host device (not shown). Since the host device is notified of the abnormal state, service and maintenance can be started in a short time to eliminate the abnormality.

  With this configuration, the rectangular wave generation circuit 306 is driven by a signal from the microcomputer 302, whereby a rectangular wave voltage is applied to the capacitors 106, 105, and 107, and the voltage of the capacitor 106 is detected by the capacitor voltage detection circuit 305. A signal is sent to 302.

  When normal, the rectangular wave voltage is divided by the capacitors 106, 105, and 107, and the voltage of the capacitor 106 is detected.

  On the other hand, when an abnormality occurs, for example, when water droplets or the like adhere to the secondary batteries 102a to 102e and the impedance between the secondary batteries 102a to 102e and the metal casing 101 decreases, the voltage of the capacitor 107 changes and the voltage of the capacitor 106 simultaneously. Also changes. Since the voltage of the capacitor 106 is detected by the capacitor voltage detection circuit 305 and a signal is sent to the microcomputer 302, the microcomputer 302 can detect the abnormality by grasping the voltage change of the capacitor 106.

  The microcomputer 302 that has detected the abnormality in this way sends a signal to the signal output terminal 308. The signal at the signal output terminal 308 is sent to, for example, a host device (not shown). Since the host device is notified of the abnormal state, service and maintenance can be started in a short time to eliminate the abnormality.

  Further, the microcomputer 302 that has detected an abnormality can control the converter 402 and stop charging immediately because it is in an abnormal state, thereby improving safety.

  The abnormality detection device for a secondary battery according to the present invention realizes simple detection of an abnormality when water drops or the like adhere to a battery that requires insulation and a metal casing and insulation cannot be secured. It is effective for a backup power source used for industrial use.

Configuration diagram of an abnormality detection apparatus in Embodiment 1 of the present invention The block diagram of the abnormality detection apparatus in Embodiment 2 of this invention The block diagram of the abnormality detection apparatus in Embodiment 3 of this invention The block diagram of the abnormality detection apparatus in Embodiment 4 of this invention Conventional configuration diagram Conventional configuration diagram

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Metal casing 102a-102i Secondary battery 103a Positive terminal 103b Negative terminal 104 Transmitter 105 Capacitor 106 Capacitor 107 Capacitor 108 Detection circuit 301 ECU
302 Microcomputer 303 Battery voltage detection circuit 304 Current detection circuit 305 Capacitor voltage detection circuit 306 Rectangular wave generation circuit 307 Power supply terminal 308 Signal output terminal 401 Charger 402 Converter 403 Constant voltage regulator 404 Thermistor 405 Temperature detection circuit 501 Battery pack 502 Battery 503a Positive terminal 503b Negative terminal 504 Battery protection circuit 505 Charging semiconductor switch 506 Charging semiconductor switch control circuit 507 Discharging semiconductor switch 508 Discharging semiconductor switch control circuit 509 Leakage detection circuit 510 Current leakage detection electrode 511 Electrode switch 601 Battery 611 Temperature sensor

Claims (4)

There are a plurality of secondary batteries connected in series or in parallel and a metal casing that covers and insulates the secondary batteries. The GND of the transmitter is connected to the metal casing, and the output of the transmitter is single or plural. Connected to the capacitors connected in series, the other end of the single or a plurality of capacitors connected in series is connected to the negative of the secondary battery, the negative of the secondary battery is connected through the metal housing and the capacitor An abnormality of a secondary battery configured to monitor one or more voltage waveforms or voltages of the single or plural capacitors connected in series with a detection circuit and determine abnormality when the value differs from an initial value or a standard value Detection device. Connect the GND of the transmitter to the negative of a secondary battery connected in multiple series or parallel, connect the negative and the metal casing with a capacitor, and connect the output of the transmitter in single or multiple series And the other end of the single or multiple series connected capacitors is connected to a metal casing, and one or more voltage waveforms or voltages of the single or multiple series connected capacitors are detected by a detection circuit. A secondary battery abnormality detection device configured to monitor and determine abnormality. There is an ECU that detects the state of the secondary battery. This ECU detects the voltage and current of the secondary battery to grasp the state of the secondary battery, and is rectangular based on a signal from a microcomputer configured in the ECU. Output a wave, connect the output to a single or a plurality of capacitors connected in series, and use one or more voltage waveforms or voltages of the capacitors connected in series to generate a voltage waveform or The secondary battery abnormality detection device according to claim 2, wherein the abnormality is determined by monitoring the voltage. There is a charger for charging the secondary battery. This charger detects the voltage, current and temperature of the secondary battery, charges the secondary battery, and based on a signal from a microcomputer configured in the charger. A rectangular wave is output, and the output is connected to a single or a plurality of series-connected capacitors. One or more voltage waveforms or voltages of the single or a plurality of series-connected capacitors are used by the microcomputer of the charger. The secondary battery abnormality detection device according to claim 2, wherein the abnormality is determined by monitoring the voltage waveform or voltage.

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