WO2017145949A1

WO2017145949A1 - Secondary battery deterioration assessment device

Info

Publication number: WO2017145949A1
Application number: PCT/JP2017/005984
Authority: WO
Inventors: 山田　裕之
Original assignee: Ntn株式会社
Priority date: 2016-02-24
Filing date: 2017-02-17
Publication date: 2017-08-31
Also published as: JP2017150926A

Abstract

Provided is a secondary battery deterioration assessment device that can be manufactured easily and inexpensively and can accurately assess the deterioration of each battery in an emergency power source in which multiple battery groups, in which multiple batteries of a data center, mobile phone base station, or the like are connected in series, are connected in parallel. A secondary battery deterioration assessment device is provided with: multiple voltage sensors (7) each connected to a battery (2); a measurement current applying means (9) that applies, to each battery group (3), a measurement current including an alternating-current component; and a controller (11). The voltage sensors (7) measure the voltage value of the alternating-current component, an internal resistance computing unit (13a) computes an internal resistance from the measured value, and an assessment unit (13b) assesses the deterioration of a battery (2) from the internal resistance. The measurement current applying device (9) generates a measurement current, including an alternating-current component, from an alternating-current commercial power source (21) and applies the measurement current to each battery group (3).

Description

Secondary battery deterioration judgment device

Related applications

This application claims the priority of Japanese Patent Application No. 2016-032946 filed on Feb. 24, 2016, which is incorporated herein by reference in its entirety.

The present invention relates to a deterioration determination device for determining deterioration of a secondary battery used for an emergency power source or the like in a data center, a mobile phone base station, or other various power supply devices that require stable power supply.

In data centers and mobile phone base stations, it is important to provide a stable power supply, and an AC commercial power supply is used in steady state, but a secondary battery is used as an uninterruptible power supply when the AC commercial power supply stops. Power supply is equipped. The charging method for the emergency power supply includes trickle charging, which uses a charging circuit to charge with a small amount of current in a steady state, and a load and a secondary battery connected in parallel to the rectifier, applying a constant current to the load. There is a form of float charging that charges while driving. In general, many types of trickle charging are employed for emergency power supplies.

The emergency power supply is required to have a voltage and current that can drive a load driven by a commercial power supply, and a single secondary battery (also referred to as a battery) has a low voltage and a small capacity. A plurality of battery groups connected in series are connected in parallel. Each battery is a lead storage battery, a lithium ion battery, or the like.

In such an emergency power source, since the voltage of the battery decreases due to deterioration, it is desirable to determine the deterioration of the battery and replace the deteriorated battery in order to ensure reliability. However, an apparatus that can accurately determine the deterioration of a large number of batteries in a large-scale emergency power source such as a data center or a mobile phone base station has not been proposed.

As a proposal example of conventional battery deterioration determination, as an in-vehicle battery checker, a proposal for measuring the whole battery collectively (for example, Patent Document 1), applying a pulsed voltage to the battery, and determining the battery from the input voltage and the response voltage Proposals for calculating the overall internal impedance (for example, Patent Document 2), methods for determining deterioration by measuring the internal resistance of individual cells connected in series in the battery (for example, Patent Document 3), and the like have been proposed. The AC four-terminal method is used to measure the internal resistance of each cell. Further, an AC four-terminal battery tester has been commercialized as a handy checker that measures a very small resistance value such as the internal resistance of the battery (for example, Non-Patent Document 1).

In Patent Documents 1 and 2, wireless data transmission is also proposed, cable management and manual work reduction, and computer data management are also proposed.

JP-A-10-170615 Japanese Patent Laid-Open No. 2005-1000096 JP 2010-164441 A

The conventional handy checker (Non-Patent Document 1) is not feasible with an emergency power source connected with dozens or hundreds of batteries because there are too many measurement points. The techniques of Patent Literatures 1 and 2 both measure the entire power source including a battery, and do not measure individual batteries, that is, individual cells. For this reason, the accuracy of deterioration determination is low, and individual batteries that have deteriorated cannot be specified.

The technique of Patent Document 3 leads to a technique of improving the accuracy of deterioration determination and identifying each deteriorated battery by measuring the internal resistance of each cell connected in series. However, since the AC four-terminal method is used for measuring the internal resistance of each cell, the configuration is complicated and it is difficult to put it to practical use in a large-scale emergency power supply having tens to hundreds of cells. A relatively simple device that can accurately determine battery deterioration is to apply an alternating current component such as ripple current or pulse current to the battery, and measure the internal resistance of the battery from the alternating current component of the battery terminal voltage. However, there is a method for judging deterioration. However, no ripple current generating means has been proposed which has a simple structure and can be manufactured at low cost.

An object of the present invention is to accurately determine the deterioration of each battery in a power source in which a plurality of batteries each of which is a secondary battery are connected in series, and is simple and inexpensive. It is an object of the present invention to provide a secondary battery deterioration determination device that can be manufactured and that requires a simple structure for applying a measurement current including an alternating current component.

Hereinafter, in order to facilitate understanding, the present invention will be described with reference to the reference numerals of the embodiments for convenience.

The secondary battery deterioration determining apparatus according to the present invention includes a power source 1 such as an emergency power source connected to a load, in which a plurality of battery groups 3 each having a plurality of secondary batteries 2 connected in series are connected in parallel. A deterioration determination device for a secondary battery for determining deterioration of each of the batteries 2 in
A plurality of voltage sensors 7 individually connected to each of the batteries 2;
An internal resistance calculator 13a that calculates the internal resistance of the battery 2 using the measured values of the voltage sensors 7,
A determination unit 13b for determining deterioration from the calculated internal resistance;
A measurement current applying means 9 for generating a measurement current including an AC component from an AC commercial power source 21 and applying the measurement current to each battery group 3 is provided.

In addition, the AC component referred to in this specification is a component in which the magnitude of the voltage repeatedly changes, and the direction of the voltage may be always constant, for example, a ripple current or a pulse current. The “battery” may be a plurality of cells connected in series or a single cell.

According to this configuration, a measurement current including an AC component is applied, the internal resistance of each battery 2 is calculated using the measured voltage value, and the deterioration of the battery 2 is determined from the internal resistance. For this reason, it is possible to accurately determine deterioration. The internal resistance of the battery 2 is closely related to the capacity of the battery 2, that is, the degree of deterioration. If the internal resistance is known, the deterioration of the battery 2 can be accurately determined. In addition, the deterioration of each battery 2 is determined instead of the entire power source 1 to be subjected to deterioration determination. However, the deterioration is determined by applying a measurement current including an AC component and measuring the internal resistance of the battery 2. Therefore, it is possible to measure with a relatively simple configuration. Although the measurement current application means 9 is necessary, the measurement current application unit 21 is configured to generate a measurement current including an AC component from the AC commercial power source 21. Therefore, the measurement current applying means 9 can be simply configured. In this way, deterioration of each battery can be determined with high accuracy, and both the means for performing detection from voltage detection and the determination and the current applying means 9 for measurement are simple, and are manufactured simply and inexpensively as a whole. It becomes a possible secondary battery deterioration determination device.

In the present invention, a current sensor 8 is connected to each battery group 3, and the controller 11 determines the measured value of each voltage sensor 7 and, for example, the current for each battery group 3 provided with this voltage sensor 7. An internal resistance calculation unit 13a that calculates the internal resistance of each battery 2 from the measurement value of the sensor 8 and a determination unit 13b that determines the deterioration of each battery 2 from the calculation result of the internal resistance calculation unit 13a. May be. Although it is possible to calculate the internal resistance by assuming the current to be constant even if only measuring the voltage, the current that actually flows through the battery 2 is measured to obtain both the voltage and the current. Thus, the internal resistance can be calculated with higher accuracy. Since the currents flowing through the batteries arranged in series are the same, it is sufficient that one current sensor 8 is provided for each battery group 3. Note that the number of current sensors 8 is one, and may be interposed between the parallel circuit of the battery group 3 and the charging circuit 6, for example.

In the present invention, the measurement current applying means 9 performs voltage conversion so that the voltage of the AC commercial power supply 21 matches the voltage of the emergency power supply 1, and the current converted by the transformer 22 The capacitor | condenser 23 which isolate | separates only an alternating current component from and applies to each said battery group 3 and the structure containing the electric current limiting part 24 which restrict | limits the electric current applied to each said battery group 3 may be sufficient. In the case of this configuration, since the transformer 22 is provided, the commercial power source 21 can be used regardless of the voltage of the emergency power source 1. In addition, by providing the capacitor 23, it is possible to separate only the AC component and apply it to each battery group 3 with a simple configuration. Further, since the current limiting unit 24 is provided, even when an excessive current flows into the measurement current applying unit 9 when an abnormality occurs in the commercial power supply 21, the abnormal power flows into the emergency power supply 1 and the emergency power supply 1. To avoid being damaged.

The current limiting unit 24 is, for example, a current limiting resistor. By using a resistor, an excessive current can be prevented with a simple configuration.

In the present invention, each voltage sensor 7 has a conversion unit 7bc for converting the measured voltage into an effective value or an average value, and the internal resistance calculation unit 13a calculates the internal value of the battery 2 from the effective value or the average value. The structure which measures resistance may be sufficient. Thus, since the measured value measured by each voltage sensor 7 is converted into an effective value or an average value represented by a digital signal and transmitted, the transmission data is dramatically higher than when a voltage waveform signal is transmitted. The amount is small. Calculation of the internal resistance of the battery 2 can be performed with an effective value or an average value with high accuracy.

In the present invention, each voltage sensor 7 may include a sensor-by-sensor wireless communication means 10 that wirelessly transmits a measurement value of the voltage sensor. In the configuration for receiving and transferring data by wireless communication, even if the emergency power source 1 includes several tens to several hundreds of batteries 2, a reference potential (ground level) is electrically set for each battery 2. There is no need to worry. Therefore, there is no need for differential operation or an isolation transformer. Further, since the measurement values of a plurality of individual voltage sensors 7 are transmitted wirelessly, there is no need for complicated wiring. By these, it can be set as a simple and cheap structure.

Any combination of at least two configurations disclosed in the claims and / or the specification and / or the drawings is included in the present invention. In particular, any combination of two or more of each claim in the claims is included in the invention.

The present invention will be understood more clearly from the following description of preferred embodiments with reference to the accompanying drawings. However, the embodiments and drawings are for illustration and description only and should not be used to define the scope of the present invention. The scope of the invention is defined by the appended claims. In the accompanying drawings, the same reference numerals in a plurality of drawings indicate the same or corresponding parts.

1 is a circuit diagram of a secondary battery deterioration determination device according to a first embodiment of the present invention. FIG. It is a block diagram which shows the conceptual structure of the voltage sensor and controller in the degradation determination apparatus of the same secondary battery. It is a flowchart which shows the operation example of the deterioration determination apparatus of the secondary battery. It is a circuit diagram of the deterioration determination apparatus of the secondary battery which concerns on other embodiment of this invention.

A first embodiment of the secondary battery deterioration determination device of the present invention will be described with reference to FIGS. In FIG. 1, a power source 1 subject to deterioration determination is an emergency power source in a data center, a mobile phone base station, or other various power sources that require stable power supply. The power source 1 has a plurality of battery groups 3 in which a plurality of batteries 2 as secondary batteries are connected in series, and these battery groups 3 are connected in parallel and connected to a load 4. Each battery 2 may be a single cell or a battery in which a plurality of cells are connected in series.

The emergency power source 1 is connected to the positive terminal 5A through the charging circuit 6 and the diode 15 among the positive and

negative terminals

5A and 5B of the main power source 5 connected to the positive and negative terminals of the load 4. The negative terminal 5B is directly connected. The diode 15 is connected in parallel with the charging circuit 6 in such a direction that current flows from the emergency power source 1 to the load 4. The main power source 5 is composed of, for example, a DC power source that is connected to an AC commercial power source via a rectifier circuit and a smoothing circuit (both not shown) and converts to DC power.

The positive potential of the emergency power source 1 is lower than the positive potential of the main power source 5 and normally does not flow to the load 4. However, when the main power source 5 stops or the function is lowered, the potential on the main power source 5 side decreases. Then, the electric charge stored in the emergency power supply 1 is fed to the load 4 via the diode 15. In addition, the charge form which connected the charging circuit 6 as mentioned above is called a trickle charge form.

This deterioration determination device for a secondary battery is a device for determining the deterioration of each battery 2 in such a power source 1. The secondary battery deterioration determination device includes a plurality of voltage sensors 7 individually connected to each battery 2, a plurality of current sensors 8 connected to each battery group 3, and a measurement current including an AC component. Current application means 9 for applying a voltage to the battery group 3, wireless sensor-by-sensor communication means 10 for wirelessly transmitting a measured value of the AC component voltage provided in each voltage sensor 7, and each voltage sensor A controller 11 that receives the measurement value transmitted by the wireless communication means 10, calculates the internal resistance of each battery 2 using the received measurement value, and determines deterioration of the battery 2 from the internal resistance;

The measurement current applying means 9 generates a measurement current including an AC component from the AC commercial power source 21 and applies it to each battery group 3. The measurement current applying means 9 is connected to the positive and negative terminal ends of the battery group 3 and supplies the power source 1 with a current having an alternating current component that changes in a pulse shape or a sine wave shape, for example, a ripple current.

More specifically, the measurement current applying means 9 is converted by the transformer 22 for voltage conversion so that the voltage of the AC commercial power supply 21 is suitable for the voltage of the emergency power supply 1, and the transformer 22 converts the voltage. It includes a capacitor 23 that separates only the AC component from the current and applies it to each battery group 3, and a current limiting unit 24 that limits the current applied to each battery group 3 (secondary side). The primary circuit of the transformer 22 is provided with an open / close switch 25 that opens and closes the commercial power supply 21. Opening / closing of the open / close switch 25 is controlled by the current application controller 11e (see FIG. 2) in the main controller 11A of the controller 11. In FIG. 1, the current limiting unit 24 may be a resistor, that is, a current limiting resistor as shown in FIG.

The voltage sensor 7 is a sensor that detects an AC component and a DC component of the voltage, and includes a sensor function unit 7a and an arithmetic processing unit 7b as shown in FIG. The sensor function unit 7a includes a voltage detection element and the like. The arithmetic processing unit 7b includes a control unit 7ba that executes a given command (command), a delay unit 7bb that delays the start of measurement of the sensor function unit 7a with respect to the command by a predetermined time, and the sensor function A conversion unit 7bc is provided that converts the analog detection value of the AC voltage detected by the unit 7a into an effective value or an average value by a digital signal. In addition to this, the voltage sensor 7 has a DC detection unit 7c for detecting a DC voltage, and the detected value of the DC component detected by the DC detection unit 7c is also transmitted from the sensor-by-sensor wireless communication means 10. The DC detection unit 7c may also serve as the sensor function unit 7a. In addition, each voltage sensor 7 has a transmission order set in advance as a transmission delay time by the delay unit 7bb or by other means, and the measurement value is transmitted from each voltage sensor 7 in a time multiplexed manner. The transmission is sequentially performed after the transmission delay time in the set order.

In this embodiment, a temperature sensor 18 for measuring the ambient temperature of the battery 2 and the temperature of the battery is provided, and at least the voltage sensor 7 and the temperature sensor 18 constitute a sensor unit 17. The temperature detected by the temperature sensor 18 is transmitted to the controller 11 by the sensor-based wireless communication means 10 together with the voltage measurement value based on the effective value or the average value of the voltage sensor 7.

In this embodiment, the controller 11 is formed by connecting a data server 13 and a monitor 14 to the main controller 11A via the communication network 12. In this embodiment, the communication network 12 is composed of a LAN and has a hub 12a. The communication network 12 may be a wide area communication network. The data server 13 can communicate with a remote personal computer (not shown) or the like via the communication network 12 or another communication network, and can monitor data from anywhere.

The main controller 11A includes a receiving unit 11a that receives the detection value of the voltage sensor 7 transmitted from each sensor wireless communication unit 10, and a transfer unit 11b that transfers the measurement value received by the receiving unit 11a to the communication network 12. Each voltage sensor 7 includes a command transmission unit 11c that wirelessly transmits a command such as a transmission start to the sensor-by-sensor wireless communication unit 10, a standby unit 11d described later, and a current application control unit 11e. The current application control unit 11e controls the measurement current application unit 9 (FIG. 1). In FIG. 2, wireless transmission / reception of the command transmission unit 11 c and the reception unit 11 a is performed via the antenna 19.

As shown in FIG. 1, each current sensor 8 is connected to the main controller 11A by wiring, and the measured value of the current is transferred together with the measured voltage value from the transfer unit 11b of FIG. The command transmission unit 11c of the main controller 11A may generate a command by itself, but in this embodiment, in response to a measurement start command transmitted from the data server 13, each sensor of each voltage sensor 7 is wireless. The measurement start command is transferred to the communication means 10. The main controller 11A or the current sensor 8 is provided with a conversion unit (not shown) that converts the measured value of the current sensor 8 into an effective value or an average value.

As described above, the controller 11 has a function of transmitting the command to the wireless communication unit 10 for each sensor. When the wireless communication unit 10 for each sensor receives the command, the calculation provided in the voltage sensor 7 is performed. It has a function of giving a command corresponding to this command to the processing unit 7b.

The data server 13 includes an internal resistance calculation unit 13a and a determination unit 13b. The internal resistance calculation unit 13a receives the AC voltage value (execution value or average value), DC voltage value (cell voltage), detected temperature, and current value (execution value or average value) transmitted from the main controller 11A. And the internal resistance of the battery 2 is calculated according to a predetermined calculation formula. The detected temperature is used for temperature correction.

The determination unit 13b determines that the threshold is set and the calculated internal resistance is greater than or equal to the threshold. A plurality of threshold values are provided (for example, for two to three stages), deterioration determination of a plurality of stages is performed, and an alarm corresponding to the plurality of stages is output as will be described later. The determination unit 13b has a function of displaying the determination result on the monitor 14 via the communication network 12 or via a dedicated wiring. In addition, the data server 13 includes a command transmission unit 13c that transmits a measurement start command to the main controller 11A, and a data storage unit 13d that stores data such as a voltage measurement value transmitted from the main controller 11A. Yes.

In the above configuration, the main controller 11A and the measurement current applying unit 9 may be configured as an integrated controller in the same case. In addition, the controller 11 is configured by the main controller 11A and the data server 13 in this embodiment, but the main controller 11A and the data server 13 may be configured as one controller 11 in the same case. In addition, one information processing apparatus configured by one substrate or the like may be configured without distinction between the main controller 11A and the data server 13.

The operation of the deterioration determination device having the above configuration will be described. FIG. 3 is a flowchart of an example of the operation. The data server 13 transmits a measurement start command from the command transmitter 13c (step S1). The main controller 11A receives a measurement start command from the data server 13 (step S2), and transmits a measurement start command to each sensor wireless communication means 10 of each voltage sensor 7 and each current sensor 8 (step S3). In parallel with the processing after this transmission, the standby unit 11d determines the end of the standby time (step S20) and counts the standby time (step S22). When the set standby time is finished, current is applied by the measurement current applying means 9 (step S21).

The measurement start command transmitted in step S3 is received by all the voltage sensors 7 (step S4). Each voltage sensor 7 waits for the end of its own measurement delay time (step S5), and then the DC voltage of the battery 2 is received. (Inter-terminal voltage) is measured (step S6). Thereafter, the voltage sensor 7 waits for the end of the standby time (step S7), and measures the AC voltage of the battery 2 (step S8). For the measurement of the AC voltage, the direct measurement value is converted into an effective voltage or an average voltage, and the converted value is output as a measurement value.

The measured DC voltage and AC voltage wait for their own transmission delay time and are transmitted wirelessly by the wireless communication means 10 for each sensor (step S9), and the main controller 11A of the controller 11 receives wirelessly (step S10). The main controller 11A transmits the received DC voltage and AC voltage together with the detection values of the current sensor 8 and the temperature sensor 18 (FIG. 2) to the data server 13 via the communication network 12 such as a LAN (step S11). The data server 13 receives the data of the sensors such as the voltage sensors 7 transmitted in order and stores them in the data storage unit 13d (step S12). From the wireless transmission step S9 to the data storage by the data server 13 is performed until the reception and storage of the data of all the voltage sensors 7 is completed (NO in step S12).

After the end of reception and storage (YES in step S12), the measurement current applying means 9 is transmitted by transmitting the end signal from the data server 13 to the main controller 11A and outputting the current application control signal of the main controller 11A. Is turned off (step S16), and the data server 13 calculates the internal resistance of each battery 2 by the internal resistance calculator 13a (step S13).

The determination unit 13b of the data server 13 compares the calculated internal resistance with an appropriately determined first threshold value (step S14), and the battery 2 is normal if it is smaller than the first threshold value. Is determined (step S15). If it is not smaller than the first threshold value, it is further compared with the second threshold value (step S17), and if it is smaller than the second threshold value, a warning that is a warning alert is output (step S18). . If it is not smaller than the second threshold value, an alarm that is stronger than the warning is output (step S19). The alarm and warning are displayed on the monitor 14 (FIG. 1). If the above is normal, the monitor 14 may indicate that it is normal, or may not be displayed in particular. The alarm and warning display by the monitor 14 may be performed by, for example, a mark such as a predetermined icon or by lighting a predetermined part. In this way, the deterioration determination of all the batteries 2 of the emergency message 1 is performed. FIG. 3 is an example of two-stage deterioration determination (and display of an alarm or the like).

According to the secondary battery deterioration determination device, each voltage sensor 7 is provided for each battery 2 and receives and transfers data with a digital signal by wireless communication. Even in the case of the emergency power source 1 provided with the batteries 2, it is not necessary to worry about the reference potential (ground level) electrically for each battery 2. Therefore, there is no need for differential operation or an isolation transformer. Further, since the measurement values of the plurality of individual voltage sensors 7 are transmitted wirelessly, there is no need for complicated wiring. By these, it can be set as a simple and cheap structure.

In addition, the deterioration of each battery 2 is determined instead of the entire power source 1 subject to deterioration determination. For the determination, a measurement current including an AC component is applied, and the wireless communication means 10 for each sensor 10 Since the internal resistance of each battery 2 is calculated using the transmitted measurement value and the deterioration of the battery 2 is determined from the internal resistance, the deterioration determination can be made with high accuracy. The internal resistance of the battery 2 is closely related to the capacity of the battery 2, that is, the degree of deterioration. If the internal resistance 2 is known, the deterioration of the battery 2 can be accurately determined.

In addition, since the measured value measured by each voltage sensor 7 is converted into an effective value or an average value represented by a digital signal and transmitted, the amount of transmission data is drastically larger than when a voltage waveform signal is transmitted. Less is enough. Calculation of the internal resistance of the battery 2 can be performed with an effective value or an average value with high accuracy. Although the calculation of the internal resistance of the battery 2 is possible only by measuring the voltage, it is possible to assume that the current is a constant value. However, the current actually flowing through the battery 2 is measured and the voltage and current are calculated. By obtaining both, the internal resistance can be calculated with higher accuracy. Since the currents flowing through the batteries 2 arranged in series are the same, it is sufficient to provide one current sensor 8 for each battery group 3.

The controller 11 transmits a measurement start command to each sensor wireless communication means 10 of each voltage sensor 7 and starts measurement of the voltage sensor 2 by this command. Can be arranged. In this case, the controller 11 simultaneously transmits a measurement start command to each voltage sensor 7 by serial transmission or parallel transmission, and each voltage sensor 7 performs measurement simultaneously after the measurement start delay time elapses. After the measurement is completed, the controller 11 sequentially transmits a data transmission request command to each of the voltage sensors 7, and the voltage sensor 7 that has received the command transmits data, and repeats the above to perform data communication. Good. In the present invention, the controller 11 may make a re-transmission request to the voltage sensor 7 that has not been able to receive data after a predetermined time from the transmission of the data transmission request command.

As another example, in the case where measurement is performed after the measurement start delay time determined for each voltage sensor 7 has elapsed, there are many even if a measurement start command is simultaneously transmitted to the wireless communication means 10 for each sensor. The measurement of each voltage sensor 7 can be performed in order so as not to hinder wireless transmission and reception, and can be transmitted. For example, the transmission start command is a global command, and the voltage sensor 7 acquires it simultaneously.

The controller 11 makes a re-transmission request to the voltage sensor 7 that has not received data after a predetermined time from the transmission of the measurement start command. There may be a case where the measurement start command cannot be received by the sensor-by-sensor wireless communication means 10 of some voltage sensors 7 due to some temporary transmission failure or the like. Even in such a case, by performing the re-transmission request, the voltage can be measured and transmitted, and the voltage measurement values of all the batteries 2 of the power source can be obtained. Whether or not the measurement start command has been received may be determined by determining whether or not the voltage measurement value has been received on the controller 11 side.

Instead of transmitting the measurement start command simultaneously as described above, the controller 11 may individually transmit a data request command to the wireless communication means 10 for each sensor of each voltage sensor 7 and sequentially receive the data. . In the case of this configuration, the delay unit 7bb is not required on the voltage sensor 7 side, and the configuration on the voltage sensor 7 side is simplified. Since the controller 11 outputs a multi-stage alarm according to the calculated magnitude of the internal resistance, the urgency of the need for battery replacement can be known, and maintenance planning and preparation can be performed without performing unnecessary battery replacement. Can be done smoothly and quickly.

Specifically, the controller 11 and its internal components include a predetermined conversion function stored in a LUT (Look Up Table) implemented by software or hardware, or a software library (Library), or an equivalent thereof. On a hardware circuit or processor (not shown) that can perform computations and output the results using the library comparison functions, four arithmetic operations functions, or equivalent hardware, etc. It consists of software functions.

The measurement power application means 9 generates a measurement current including an AC component from the AC commercial power supply 21 and applies the measurement current to each of the battery groups 3, so that the measurement current including the AC component in the battery group 3 is configured with a simple configuration. Can be applied. By providing the transformer 22 and the capacitor 23, even if the voltages of the commercial power source 21 and the battery group 3 are different, the voltage of the current for measurement can be matched with the voltage of the battery group 3, and only the AC component can be obtained. It can be applied to the battery group 3. Further, since the current limiting unit 24 such as a resistor is provided, the current applied to the battery group 3 can be limited, and the battery group 3 can be protected from overcurrent. When the current limiting unit 24 is a resistor, a simple configuration is sufficient.

As mentioned above, although the suitable form for implementing this invention based on embodiment was demonstrated referring drawings, embodiment disclosed here is an illustration and restrictive at no points. The scope of the present invention is shown not by the above description but by the claims. Those skilled in the art will readily appreciate various changes and modifications within the obvious scope upon reviewing this specification. Therefore, such changes and modifications should be construed as being within the scope of the invention defined by the claims or within the scope equivalent thereto.

DESCRIPTION OF SYMBOLS 1 ... Power supply 2 ... Battery 3 ... Battery group 4 ... Load 5 ...

Main power supply

5A, 5B ... Terminal 6 ... Charging circuit 7a ... Sensor function part 7ba ... Arithmetic processing part 7ba ... Control part 7bb ... Delay part 7bc ... Conversion part 7c ... DC detection unit 8 ... current sensor 9 ... measurement current application unit 10 ... per-sensor wireless communication unit 11 ... controller 11A ... main controller 11a ... reception unit 11b ... transfer unit 11c ... command transmission unit 11d ... standby unit 11e ... current application control Unit 12 ... Communication network 13 ... Data server 13a ... Internal resistance calculation unit 13b ... Determining unit 14 ... Monitor 15 ... Diode 17 ... Sensor unit 18 ... Temperature sensor 19 ... Antenna 21 ... Commercial power supply 22 ... Transformer 23 ... Capacitor 24 ... Current limit Part 25: Open / close switch

Claims

A secondary battery for determining deterioration of each battery in an emergency power source in which a plurality of batteries each of which is a secondary battery are connected in series, and these battery groups are connected in parallel and connected to a load A deterioration determination device,
A plurality of voltage sensors individually connected to each of the batteries;
An internal resistance calculator that calculates the internal resistance of the battery using the measured values of the voltage sensors;
A determination unit for determining deterioration from the calculated internal resistance;
A measurement current applying means for generating a measurement current including an AC component from an AC commercial power supply and applying the measurement current to each of the battery groups;
Secondary battery deterioration determination device.
2. The secondary battery deterioration determination device according to claim 1, wherein a current sensor is connected to each of the battery groups, and the internal resistance calculation unit uses the measurement value of the current sensor together with the measurement value of the voltage sensor. A secondary battery deterioration determination device for calculating the internal resistance.
3. The secondary battery deterioration determination apparatus according to claim 1, wherein the measurement current application unit performs voltage conversion so that a voltage of the AC commercial power supply matches a voltage of the emergency power supply. A deterioration determination of a secondary battery including a capacitor that separates only an alternating current component from the current converted by the transformer and applies to each battery group, and a current limiting unit that limits a current applied to each battery group apparatus.
4. The secondary battery deterioration determination device according to claim 3, wherein the current limiting unit is a current limiting resistor.
5. The secondary battery deterioration determination device according to claim 1, wherein each of the voltage sensors includes a conversion unit that converts a measured voltage into an effective value or an average value, and the internal resistance The calculation unit is a secondary battery deterioration determination device that measures an internal resistance of the battery from the effective value or the average value.
6. The secondary battery deterioration determination device according to claim 1, further comprising a sensor-by-sensor wireless communication unit that wirelessly transmits a measurement value of the voltage sensor for each voltage sensor. Secondary battery deterioration judgment device.