JP2010156625A - Apparatus for measuring state of power supply element and apparatus for monitoring state of dc power supply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a state measurement apparatus for simply and inexpensively measuring the state quantity, such as, an output voltage and a temperature, when a power supply element is charged and discharged. <P>SOLUTION: In a cell measurement circuit 11, a measurement computer 12 and a capacitor C1 are connected across both terminals of a battery cell B in parallel. An output 14b of an activation photocoupler 14 is connected to the measurement computer 12, a reference voltage generating IC 15 and a temperature sensor 16. THe output terminals of the reference voltage generating IC 15 and the temperature sensor 16 are connected to input terminals of the measurement computer 12. The measurement computer 12 is connected to an input 18a of an output photocoupler 18. The measurement computer 12 receives an activation signal from the activation photocoupler 14; detects the output voltage from each battery cell Bn; reads the temperature from the temperature sensor 16; and calculates the magnitude of the output voltage and the temperature, based on a reference voltage read from the reference voltage generating IC. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a state measuring device that detects a state quantity such as an output voltage or temperature of a power supply element that stores and discharges a voltage in a range of about 2 to 5.5 v such as a lithium ion battery or an electric double layer capacitor, The present invention relates to a DC power supply state monitoring device that monitors the state of a DC power supply used as a power supply for an electric vehicle, a hybrid car, or the like in which a plurality of power supply elements are connected in series.

Conventionally, with respect to a DC power supply in which a large number of power supply elements such as lithium ion batteries and electric double layer capacitors are connected in series, there is a problem that individual element voltages are likely to vary, thereby reducing the life of the power supply elements. Therefore, when charging or discharging the power supply element, it is necessary to monitor the voltage and temperature in units of individual cells to suppress cell voltage variations. However, when trying to measure the voltage of each power supply element, the wiring for measurement becomes very complicated, the measurement is complicated and the measurement cost is expensive, and it is handled by connecting multiple power supply elements in series. There was a problem that the voltage became very high. On the other hand, as shown in Patent Document 1, for example, there is a device for measuring individual cell voltages using a flying capacitor, but this measuring device has a complicated switching circuit and many expensive components such as a relay. Therefore, there is a problem that the apparatus becomes very expensive.
JP 2002-289263 A

  An object of the present invention is to provide a state measurement device that can easily and inexpensively measure state quantities such as output voltage and temperature when a power supply element is charged and discharged. Another object of the present invention is to provide a DC power supply state monitoring device that can easily and inexpensively monitor the output voltage and temperature state of each power supply element in a DC power supply in which a plurality of power supply elements are connected in series. .

  In order to achieve the above object, the constitutional feature of the invention of claim 1 is a state measuring apparatus for measuring the state when the power supply element is charged and discharged by being fed from the power supply element, and starts detection from the outside. A starting photocoupler that receives an input and outputs a starting signal, a reference voltage generating unit that generates a reference voltage in response to the starting signal, and a reference voltage generating unit that detects the output voltage of the power supply element in accordance with the starting signal. Measurement control means that reads the voltage and outputs the voltage calculation signal by calculating the magnitude of the output voltage based on the reference voltage, and the output photo that receives the voltage calculation signal from the measurement control means and outputs it as the voltage calculation signal A coupler is provided. Here, the power supply element is a secondary battery such as a lithium ion battery or a supercapacitor such as an electric double layer capacitor. The state of the power supply element is an output voltage or temperature.

  In the present invention, when a detection start input is transmitted from the outside during charging and discharging of the power supply element, the startup photocoupler receives this and outputs a start signal for starting detection of the state of the power supply element. In response to the start signal, the reference voltage generating means generates a reference voltage, the measurement control means detects the output voltage of the power supply element, and the measurement control means reads the reference voltage from the reference voltage generating means and reads this reference voltage. Is output as a voltage calculation signal by calculating the magnitude of the output voltage. In response to the voltage calculation signal from the measurement control means, the output photocoupler outputs the voltage calculation signal. As a result, in the present invention, the output voltage of the power supply element can be measured at high speed. Further, in the present invention, since it is composed only of inexpensive parts such as a start-up photocoupler, an output photocoupler, a reference voltage generation device, and a measurement control means, a power supply device state measurement device is provided at low cost.

  Further, in the first aspect of the present invention, there is provided temperature detecting means for detecting the temperature of the power supply element in response to the activation signal and outputting a temperature detection value, and the measurement control means reads the temperature detection value from the temperature detection means, By calculating the magnitude of the temperature detection value based on the reference voltage, it is output as a temperature calculation signal, and upon receipt of the temperature calculation signal, the output photocoupler can output it as a temperature calculation signal. Thereby, in addition to the calculation output of the voltage calculation signal by the state measurement device, the temperature detection means detects the temperature of the power supply element upon receiving the start signal, the measurement control means reads the temperature detection value from the temperature detection means, and the reference By calculating the magnitude of the temperature detection value based on the voltage, it can be output as a temperature calculation signal and output from the output photocoupler as a temperature calculation signal. As a result, according to the present invention, since the temperature can be obtained in addition to the output voltage as the state quantity of the power supply element, the state of the power supply element can be obtained in more detail.

  According to a third aspect of the present invention, there is provided a state monitoring device for monitoring a state of a DC power source composed of a plurality of power supply elements connected in series. Connected to the state measurement device, charge / discharge detection means that detects when the DC power supply is charged or discharged and outputs a detection signal, and receives a detection signal from the charge / discharge detection means, and inputs detection start to the startup photocoupler And a monitoring control means for receiving voltage calculation signals from a plurality of state measuring devices from the output photocoupler.

  In the third aspect of the invention, the state measuring device according to the first aspect is connected to each of the plurality of power supply elements connected in series, and is detected by the charge / discharge detection means when the DC power supply is charged or discharged. A signal is output. Upon receiving a detection signal from the charge / discharge detection means, a detection start input is transmitted from the monitoring control means to the start photocoupler of each state measuring device, and the start photocoupler receives this and starts detecting the state of the power supply element. The start signal for output is output. The state calculation device according to claim 1, wherein the voltage calculation signal is obtained by calculating the magnitude of the output voltage on the basis of the reference voltage from the reference voltage generating means for the detected output voltage of the power supply element. The output photocoupler transmits as a voltage calculation signal and is received by the monitoring control means.

  As a result, in the present invention, each power supply element of the DC power supply is connected in series, and the power supply elements are insulated from each other, so that the power supply elements are not affected by each other during measurement by the state measuring device. The state of each power supply element of the DC power supply can be monitored easily and accurately. Further, in the present invention, the state monitoring device is composed only of inexpensive parts such as the state measuring unit, the charge / discharge detecting unit, the monitoring control unit, etc., so that it is much larger than the conventional monitoring device using a flying capacitor or the like. Provided at low cost.

  Further, in the invention of claim 3, a plurality of power supply elements are divided into a plurality of sets, and one temperature detection means is provided for each set, and a start signal is received from a start photocoupler of any of the state measuring devices. The temperature detection means outputs a temperature detection signal, and the temperature calculation signal calculated based on the reference voltage by the measurement control means that has received the temperature detection signal can be received by the monitoring control means through the output photocoupler. As a result, a temperature detection value is obtained from each set obtained by dividing a plurality of power supply elements into a plurality of sets based on one temperature detection means, and a temperature calculation signal calculated based on the temperature detection value and the reference voltage is output. It is transmitted from the photocoupler and received by the monitoring control means. As a result, predetermined temperature information can be obtained while reducing the number of temperature detecting means.

  According to a fifth aspect of the present invention, there is provided a state monitoring device for monitoring a state of a direct current power source composed of a plurality of power supply elements connected in series. Connected to the state measurement device, charge / discharge detection means that detects when the DC power supply is charged or discharged and outputs a detection signal, and receives a detection signal from the charge / discharge detection means, and inputs detection start to the startup photocoupler And a monitoring control means for receiving voltage calculation signals and temperature calculation signals from a plurality of state measurement devices from the output photocoupler.

  In the invention of claim 5 above, the state measuring device according to claim 2 is connected to each of the plurality of power supply elements connected in series, and is detected by the charge / discharge detection means when the DC power supply is charged or discharged. A signal is output. Upon receiving a detection signal from the charge / discharge detection means, a detection start input is transmitted from the monitoring control means to the start photocoupler of each state measuring device, and the start photocoupler receives this and starts detecting the state of the power supply element. The start signal for output is output. In response to the activation signal, in each state measuring device according to claim 2, the output voltage of the detected power supply element and the temperature detection value from the temperature detection means are output based on the reference voltage from the reference voltage generation means. And the temperature calculation signal are output as a voltage calculation signal and a temperature calculation signal, and the output photocoupler transmits the voltage calculation signal and the temperature calculation signal as received by each monitoring control means.

  As a result, in the present invention, each power supply element of the DC power supply is connected in series, and the power supply elements are insulated from each other, so that the power supply elements are not affected by each other during measurement by the state measuring device. The state of each power supply element of the DC power supply can be monitored easily and accurately. Further, in the present invention, since the state monitoring device is composed only of inexpensive parts such as the state measuring means, the charge / discharge detecting means, and the monitoring control means, it is significantly larger than the conventional monitoring apparatus using a flying capacitor or the like. Provided at low cost.

  In the present invention, the output voltage of the power supply element can be measured at high speed by the state measuring device. Further, in the present invention, since it is composed only of inexpensive parts such as a start-up photocoupler, an output photocoupler, a reference voltage generation device, and a measurement control means, a power supply device state measurement device is provided at low cost.

  In the present invention, during charging / discharging of a DC power supply in which a plurality of power supply elements are connected in series, the output voltage and temperature of each power supply element of the DC power supply are affected by voltage fluctuation during charging / discharging by the state monitoring device. It is possible to measure the power supply elements easily and accurately. Moreover, since the state monitoring device is composed of only inexpensive components such as the state measuring device, the charge / discharge detection unit, and the monitoring control unit, the state monitoring device is provided at a significantly lower price than the conventional state monitoring device.

  Hereinafter, embodiments of the present invention will be described. FIG. 1 is a circuit diagram showing a DC power supply state monitoring apparatus in which a number of lithium ion batteries of Example 1 are connected in series, and FIG. 2 is a state measurement for measuring the output voltage and temperature of each battery connected to each battery. The cell measurement circuit which is an apparatus is shown with the circuit diagram. The DC power supply state monitoring device 10 includes a cell measuring circuit 11 (1) for each battery cell B of the DC power supply 1 in which a large number of single lithium ion batteries B1 to Bn (hereinafter referred to as battery cells B) are connected in series. ) To 11 (n) are connected, and the cell measuring circuits 11 (1) to 11 (n) are connected to a monitoring microcomputer 21 (hereinafter referred to as a monitoring computer) that monitors the state of the DC power supply 1. It is connected. The cell measurement circuits 11 (1) to 11 (n) have the same configuration, and will be described as the cell measurement circuit 11 below.

  The cell measuring circuit 11 is connected to both ends of the battery cell B in the direction of the arrow XX in FIG. 2, and is connected to the (+) side lead wire connected to the + terminal of the battery cell B and the − terminal. A power supply terminal 12a of a measurement control microcomputer 12 (hereinafter referred to as a measurement computer) which is a measurement control means between the lead wires and the voltage of the battery cell B. A capacitor C1 for supplying power to the computer 12 is connected in parallel with each other. One end of the output side 14b which is a light receiving transistor of the starting photocoupler 14 is connected to the (+) side line. An input side 14 a which is a light emitting diode of the starting photocoupler 14 is connected to an output terminal 21 a of the monitoring computer 21. A lead wire extending from the other of the output side 14b branches in the middle, and one is connected to the negative side lead wire via a resistor r1 and is connected to the start input terminal 12b of the measuring computer 12 before the resistor r1. ing.

  Further, the lead wire extending from the other of the output terminals 14b branches in the middle, one is connected to the power supply terminal 15a of the reference voltage generating IC 15 via the resistor r2, and the other is the power supply terminal of the temperature sensor 16 which is a temperature detecting means. The reference voltage generating IC 15 and the temperature sensor 16 are connected to the (−) terminal side lead wire. The output terminal 15b of the reference voltage generating IC 15 is connected to the voltage input terminal 12c of the measuring computer 12, and is connected to the negative lead via a reference voltage supply capacitor C2. The reference voltage generating IC 15 and the capacitor C2 constitute basic voltage generating means. The output terminal 16 b of the temperature sensor 16 is connected to the temperature input terminal 12 d of the measurement computer 12. An output terminal 12 e of the measurement computer 12 is connected to an input side 18 a that is a light emitting diode of the output photocoupler 18. The other end of the input side 18a is connected to the (−) side lead wire via a resistor r3. An output terminal 18 b that is a light receiving transistor of the output photocoupler 18 is connected to an input terminal 21 b of the monitoring computer 21.

  The monitoring computer 21 includes a transmission terminal 21d for transmitting output voltages and temperature data of the battery cells Ba to Bn transmitted from the cell measuring circuits 11 (1) to 11 (n) to the management department, and a command from the management department. A receiving terminal 21e for receiving signals and the like is provided. A charge / discharge current sensor 22, which is a charge / discharge detection means for detecting current during charging and discharging of the DC power supply 1, is connected to the charge / discharge line of the DC power supply 1, and the output of the charge / discharge current sensor 22 is monitored. Is connected to the charge / discharge input terminal 21c of the computer 21 for use. The DC power source 1 is supplied with power from a charging power source (not shown) at the time of charging, and discharged to a driving circuit (not shown) such as a hybrid vehicle as a load at the time of discharging.

  In the first embodiment having the above-described configuration, the monitoring computer 21 receives a start signal from the receiving terminal 21e that receives a command signal or the like from the management department, and receives an individual cell measurement circuit device 11 (1) from the monitoring computer 21. The detection start input is transmitted to the startup photocouplers 14 to 11 (n), and the startup photocoupler 14 receives this and outputs a startup signal for starting detection of the state of the battery cell B. In response to this activation signal, the reference voltage generation IC 15 of each cell measurement circuit 11 generates a reference voltage and inputs it to the measurement computer 12. The measurement computer 12 detects the output voltage of each battery cell Bn, and calculates the magnitude of the output voltage based on the reference voltage read from the reference voltage generation IC. The measurement computer 12 reads the reference voltage, AD converts it into a digital signal, performs processing according to the resolution of the computer, and compares the output voltage of the battery cell B with a voltage calculation signal in a short time of about 10 msec. Is output to the output photocoupler 18. Specifically, the voltage of the battery cell B is obtained by multiplying the reference voltage by the value obtained by dividing the maximum value of AD conversion by the read value obtained by AD conversion of the reference voltage. Upon receiving the voltage calculation signal, the output photocoupler 18 transmits it as a voltage calculation signal, and the monitoring computer 21 receives it.

  In response to the activation signal, the temperature sensor 16 detects the temperature of the battery cell B and outputs a detection signal to the measurement computer 12. The measurement computer 12 reads the temperature detection value from the temperature sensor 16 and calculates the battery temperature based on the reference voltage read from the reference voltage generation IC. The measurement computer 12 obtains and outputs a temperature calculation signal representing the magnitude of the temperature detection value in a short time of about 10 msec by comparing the read temperature detection value with a reference voltage processed according to the resolution of the computer. Output to the photocoupler 18. Specifically, the temperature of the battery cell B is obtained by multiplying the reference voltage by a value obtained by dividing the read value obtained by AD conversion of the voltage value of the temperature sensor 16 by the read value obtained by AD conversion of the reference voltage. The temperature can be obtained from the relationship between the voltage and the temperature stored in the storage device based on the value. The output photocoupler 18 transmits the temperature calculation signal to the monitoring computer 21.

  As a result, in the first embodiment, the measurement processing of the measurement computer 12 can obtain the output voltage and temperature of each battery cell B connected in series at high speed, and is affected by voltage fluctuation during charging and discharging. There is no. In the first embodiment, the cell measurement circuit 11 is composed of inexpensive components such as a measurement computer 12, a start-up photocoupler 14, an output photocoupler 18, a reference voltage generation IC 15, a temperature sensor 16, a capacitor, and a resistor. So it is offered very cheaply. For this reason, the state monitoring device 10 of the DC power source combining the inexpensive cell measuring circuit 11, the charge / discharge current sensor 22 and the monitoring computer 21 is also significantly larger than the conventional battery monitoring device using a flying capacitor or the like. Provided at low cost. Moreover, in Example 1, since each battery cell B is connected in series and each battery cell B is insulated, each battery cell B has influence from others at the time of the measurement control by the cell measurement circuit 11. Without being received, the state of each battery cell B of the DC power source 1 can be monitored easily and accurately. Furthermore, in the first embodiment, since the measurement computer 12, the reference voltage generation IC 15, and the temperature sensor 16 can be driven by the voltage of the battery cell B, there is no need to separately prepare a power source. It can be kept low.

  Next, a cell measurement circuit 11A that is Modification 1 of Embodiment 1 will be described. As shown in FIG. 3, the modification 1 is obtained by omitting the temperature sensor 16 in the cell measurement circuit 11 of the first embodiment, and other configurations are not changed. Thereby, in the modification 1, only the output voltage of the battery cell B is measured by the cell measurement circuit 11A and the temperature is not detected, but the state of the battery cell B can be grasped only by the output voltage. Since it is possible, it is also possible to employ | adopt according to the use of the state management of the battery cell B. FIG. In the first modification, the cost required for the temperature sensor and the temperature processing can be reduced.

  Next, a DC power supply state monitoring apparatus that is a second modification of the first embodiment will be described. As shown in FIG. 4, in the second modification, the battery cells connected in series are divided into a plurality of groups (three in the second modification) to form a plurality of groups G1 to Gx, one temperature for each group. Sensors 16 (1) to 16 (x) are arranged, and the cell measurement circuit 31 of the state monitoring device 30 is shown in the first modification. One cell measurement circuit 31 in each group (in the second modification, each One temperature sensor 16 is connected to the measuring computer 12 of the second circuit in the set).

  In the modification 2, the output voltage is measured for each battery cell B, and the temperature of the battery cell B is measured for each of the groups G1 to Gx in which a plurality of battery cells are collected. . As a result, in the second modification, the temperature is not measured for all the battery cells B, but the temperature measurement is performed for each of the battery cell groups G1 to Gx, thereby reducing the cost of the temperature sensor and the measurement effort. On the other hand, since the temperature information of the battery cell B is also roughly obtained as compared with the first embodiment, it can be used according to the purpose of monitoring the DC power supply, and more information than the first modification can be obtained.

  Next, a DC power supply state monitoring apparatus according to the second embodiment will be described. In the second embodiment, in the DC power supply state monitoring apparatus 10 of the first embodiment, the cell measurement circuit is configured as shown in the circuit diagram of FIG. There is no other change in the configuration of the state monitoring device 30 of the second embodiment. In the cell measurement circuit 31, a measurement computer 32 is connected between a (+) side lead wire and a (−) side lead wire by a power supply terminal 32a, and a capacitor C1, a starting photocoupler 14, a resistor r1, and an output photocoupler. The connection between the resistor 18 and the resistor r3 is the same as that in the first embodiment. The lead wire extending from the other of the output terminals 14b of the starting photocoupler 14 is connected to the negative lead wire via the resistor r1 without branching on the way and to the input terminal 32b of the measuring computer 32 before the resistor r1. It is only connected.

  Further, the lead wire extending from the voltage supply terminal 32c of the measuring computer 32 branches in the middle, one being parallel to the power supply terminal 15a of the reference voltage generating IC 15 via the resistor r2 and the other being parallel to the power supply terminal 16a of the temperature sensor 16. To the negative terminal side lead wire from the reference voltage generating IC 15 and the temperature sensor 16. The output terminal 15b of the reference voltage generating IC 15 is connected to the voltage input terminal 32d of the measuring computer 32 and is connected to the negative lead via a reference voltage supply capacitor C2. The output terminal 16 b of the temperature sensor 16 is connected to the temperature input terminal 32 e of the measurement computer 32. An output terminal 32 f of the measurement computer 32 is connected to an input side 18 a that is a light emitting diode of the output photocoupler 18. In the second embodiment, the measurement computer 32 has a power supply start switch function. When the start signal is input, the measurement computer 32 causes the reference voltage generation IC 15 and the temperature sensor 16 in the non-powered state to be connected to the battery cell B by the power supply start switch function. The cell voltage is fed to the power source and the connection of the battery cell B to the reference voltage generating IC 15 and the temperature sensor 16 is stopped by stopping the input of the start signal. Therefore, the reference voltage generation means includes a power supply start switch unit having a power supply start switch function of the measurement computer 32 in addition to the reference voltage generation IC 15 and the capacitor C2. In addition to the temperature sensor 16, the temperature detection means also includes a power supply start switch portion of the measurement computer 32.

  In the second embodiment having the above-described configuration, the monitoring computer 21 receives a start signal from the receiving terminal 21e that receives a command signal or the like from the management department, and receives the individual cell measurement circuits 31 (1) to 31 (1) from the monitoring computer 21. A detection start input is transmitted to the start photocoupler 31 (n), and the start photocoupler 14 receives this and outputs a start signal for starting detection of the state of the battery cell B. In response to this activation signal, the measurement computer 32 uses the power supply start switch function to connect the reference voltage generation IC 15 and the temperature sensor 16 that are in an unpowered state to the battery cell B to supply the cell voltage. Thereby, the reference voltage generation IC 15 generates a reference voltage and inputs it to the measurement computer 32, and the temperature sensor 16 detects the temperature of the battery cell B and inputs it to the measurement computer 32.

  As in the first embodiment, the measurement computer 32 reads the reference voltage, AD converts it into a digital signal, performs processing according to the resolution of the computer, and compares the detected output voltage of the battery cell B with 10 msec. A voltage calculation signal is obtained and output to the output photocoupler 18 in a short time. In response to the voltage calculation signal, the output photocoupler 18 transmits it as a voltage calculation signal and is received by the monitoring computer 21. Further, the measurement computer 32 reads the temperature detection value from the temperature sensor 16 and calculates the battery temperature based on the reference voltage read from the reference voltage generation IC. Similar to the first embodiment, the measurement computer 32 compares the read temperature detection value with the reference voltage processed in accordance with the AD conversion resolution of the computer, thereby calculating the magnitude of the temperature detection value in a short time of about 10 msec. Is calculated and output to the output photocoupler 18. In response to the temperature calculation signal, the output photocoupler 18 transmits it as a temperature calculation signal and is received by the monitoring computer 21.

  As a result, also in the second embodiment, similarly to the first embodiment, by adopting the cell measuring circuit 31 in the state monitoring device 30, the output voltage and temperature of each battery cell B at the time of charging and discharging of the battery cell B can be obtained. It can be measured and monitored easily and accurately. Further, in the second embodiment, the connection to the reference voltage generation IC 15 and the temperature sensor 16 of the battery cell B is controlled by the power supply start switch function of the measurement computer 32, so that the measurement control time is compared with the first embodiment. Although it becomes longer, since the reference voltage generation IC 15 and the temperature sensor 16 are in a non-energized standby state separated from the battery cell B except during charging and discharging, the current consumption is suppressed to a low value on the order of μA, and the state is monitored. The energy saving effect of the device 30 is enhanced.

  Further, in the second embodiment, since the measurement computer 32, the start photocoupler 14, the output photocoupler 18, the reference voltage generator 15, the temperature sensor 16 and the like are used, the cell measurement of the battery cell B is performed. The circuit 31 is provided at a low cost. Therefore, the state monitoring device 30 of the DC power source combining the inexpensive cell measuring circuit 31, the charge / discharge current sensor 22, and the monitoring computer 21 is also very inexpensive as compared with the conventional battery monitoring device using the flying capacitor. Provided to. Moreover, in Example 2, since each battery cell B is connected in series and each battery cell B is insulated, each battery cell B has influence from others at the time of the measurement control by the cell measurement circuit 11. Without being received, the state of each battery cell B of the DC power source 1 can be monitored easily and accurately. Furthermore, in the second embodiment, since the measurement computer 32, the reference voltage generation IC 15, and the temperature sensor 16 can be driven by the voltage of the battery cell B, it is not necessary to prepare a separate power source. It can be kept low.

  Next, a cell measurement circuit 31A that is a modification of the second embodiment will be described. As shown in FIG. 6, the modification is obtained by omitting the temperature sensor 16 in the cell measurement circuit 31 of the second embodiment, and other configurations are not changed. Thereby, in the modified example, only the output voltage of the battery cell B is measured by the cell measurement circuit 31A and the temperature is not detected, but it is possible to grasp the state of the battery cell B only by the output voltage. It is also possible to employ according to the use of state management of the battery cell B. Moreover, in a modification, the cost which a temperature sensor and temperature processing require can be reduced.

  In addition, when the temperature sensor 16 is omitted from each cell measurement circuit 31 as in the modification, a large number of battery cells B are divided into a plurality of groups as in Modification 2 of Example 1 described above. It is also possible to manage the temperature by providing a temperature sensor. In each embodiment, a lithium ion battery is used as the power supply element, but another secondary battery, an electric double layer capacitor, or the like can be used instead. In addition, what was shown in each said Example is an example, It is also possible to implement in various changes in the range which does not deviate from the meaning of this invention.

  The power supply device state measurement apparatus of the present invention can measure the output voltage and temperature of the power supply device at high speed, and only with inexpensive parts such as a start photocoupler, output photocoupler, reference voltage generator, and measurement control means. Because it is configured, it is provided at low cost. In addition, the DC power supply state monitoring device of the present invention can obtain the output voltage and temperature of each power supply element of a DC power supply in which a plurality of power supply elements are connected in series, and is not affected by voltage fluctuations during charging and discharging. The state of each power supply element can be easily and accurately monitored, and is composed of only inexpensive parts such as an inexpensive state measurement device, charge / discharge detection means, and monitoring control means. It is provided at a lower cost than the monitoring device. Therefore, the present invention is useful.

It is a circuit diagram which shows schematic structure of the state monitoring apparatus of the DC power supply which is Example 1 of this invention. It is a circuit diagram which shows the cell measurement circuit which comprises a state monitoring apparatus. FIG. 9 is a circuit diagram showing a cell measurement circuit that is a first modification. It is a circuit diagram which shows schematic structure of the state monitoring apparatus of the DC power supply which is the modification 2. It is a circuit diagram which shows schematic structure of the state monitoring apparatus of the DC power supply which is Example 2. FIG. FIG. 10 is a circuit diagram showing a cell measuring circuit which is a modification of the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,30 ... DC power supply state monitoring device 11, 11, A, 31 ... Cell measurement circuit, 12, 32 ... Measurement control microcomputer, 14 ... Start-up photocoupler, 15 ... Reference voltage generation IC, 16 ... Temperature sensor, 18 ... output photocoupler, 21 ... monitoring microcomputer, 22 ... charge / discharge current sensor.

Claims (5)

A state measuring device that is fed from a power supply element and measures the state of charging and discharging of the power supply element,
A startup photocoupler that receives a detection start input from the outside and outputs a startup signal;
Reference voltage generating means for generating a reference voltage in response to the activation signal;
Measurement that outputs a voltage calculation signal by detecting the output voltage of the power supply element according to the activation signal, reading the reference voltage from the reference voltage generating means, and calculating the magnitude of the output voltage based on the reference voltage Control means;
An apparatus for measuring a state of a power supply element, comprising: an output photocoupler that receives a voltage calculation signal from the measurement control means and outputs the voltage calculation signal. A temperature detecting means for detecting the temperature of the power supply element in accordance with the activation signal and outputting a temperature detection value;
The measurement control means reads the temperature detection value from the temperature detection means, calculates the temperature detection value based on the reference voltage, and outputs it as a temperature calculation signal,
2. The power element state measuring apparatus according to claim 1, wherein the output photocoupler receives the temperature calculation signal and outputs the temperature calculation signal as a temperature calculation signal. A state monitoring device for monitoring the state of a DC power source composed of a plurality of power supply elements connected in series,
The state measuring device according to claim 1 is connected to each of the plurality of power supply elements,
Charge / discharge detection means for detecting a charge or discharge of the DC power supply and outputting a detection signal;
Monitoring control means for receiving a detection signal from the charge / discharge detection means, transmitting a detection start input to the activation photocoupler, and receiving voltage calculation signals from the plurality of state measurement devices from the output photocoupler; A DC power supply state monitoring device.   The plurality of power supply elements are divided into a plurality of groups, and one temperature detection unit is provided for each group, and the temperature detection unit detects a temperature in response to a start signal from a start photocoupler of any of the state measurement devices. 2. A temperature calculation signal calculated based on the reference voltage by the measurement control means that outputs a signal and receives the temperature detection signal is received by the monitoring control means through the output photocoupler. 3. A state monitoring apparatus for a DC power source according to 3. A state monitoring device for monitoring the state of a DC power source composed of a plurality of power supply elements connected in series,
The state measuring device according to claim 2 is connected to each of the plurality of power supply elements,
Charge / discharge detection means for detecting a charge or discharge of the DC power supply and outputting a detection signal;
Monitoring control that receives a detection signal from the charge / discharge detection means, transmits a detection start input to the start photocoupler, and receives voltage calculation signals and temperature calculation signals from the plurality of state measurement devices from the output photocoupler. And a DC power supply state monitoring device.

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