JP2022127458A - Battery information collecting device and battery monitoring system - Google Patents

Abstract

To provide a battery information collecting device and a battery monitoring system that can more accurately evaluate thermal runway of a plurality of batteries than before.SOLUTION: A battery information collecting device includes: a communication unit that receives, from a plurality of battery systems equipped with batteries, battery data indicating operation states of the batteries and transmits, to the battery systems, an evaluation threshold value for the battery systems to evaluate thermal runway of the batteries; and an arithmetic unit that generates the evaluation threshold value on the basis of the battery data obtained from the communication unit and outputs the evaluation threshold value to the communication unit.SELECTED DRAWING: Figure 1

Description

The present invention relates to a battery information collection device and a battery monitoring system.

Japanese Unexamined Patent Application Publication No. 2002-200001 discloses a power supply device for a vehicle that can reliably prevent thermal runaway while simplifying the circuit configuration for preventing thermal runaway of the battery. This power supply device includes a plurality of batteries that drive the motor, a temperature detection circuit that detects the temperature of the batteries, and an abnormal temperature rise prevention circuit that prevents an abnormal temperature rise in the batteries. A plurality of temperature sensors that are arranged to be coupled and change electrical resistance with battery temperature, a voltage conversion circuit that converts the change in electrical resistance of each temperature sensor into a voltage change, and the output voltage of the voltage conversion circuit is digital and a control circuit to which the temperature signal output from the A/D converter is input. A comparator that compares the voltage with a reference voltage and outputs an abnormal temperature signal when the battery temperature rises to a set temperature, and a forced current cutoff circuit that is connected to the comparator and detects the abnormal temperature signal of the comparator and cuts off the battery current. A control circuit and an abnormal temperature rise prevention circuit monitor the temperature of the battery and control the current of the battery.

Japanese Patent No. 4931378

By the way, the above background art evaluates thermal runaway in a single vehicle, that is, in a single battery. is assumed. With the above background art, it is difficult to accurately evaluate thermal runaway for a plurality of batteries with different operating environments and operating states.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a battery information collecting device and a battery monitoring system capable of evaluating thermal runaway of a plurality of batteries more accurately than in the past.

In order to achieve the above object, in the present invention, as a first solution related to a battery information collection device, battery data indicating operating states of the batteries are received from a plurality of battery systems having batteries, and the battery systems a communication unit that transmits an evaluation threshold for evaluating thermal runaway of the battery to the battery system; and a communication unit that generates the evaluation threshold based on the battery data acquired from the communication unit and evaluates the evaluation threshold and a calculation unit that outputs the threshold value to the communication unit.

In the present invention, as a second solving means related to the battery information collecting device, in the above first solving means, the computing unit creates a histogram of data values of the plurality of batteries based on the battery data, Means are employed to generate the evaluation threshold based on a histogram.

In the present invention, as a third solution related to the battery information collection device, in the first solution, the battery data includes normal battery data when the battery is normal and abnormal battery data when the battery is abnormal. and the calculation unit employs a means for setting a data value between a normal histogram indicating the distribution of the normal battery data and an abnormal histogram indicating the distribution of the abnormal battery data as the evaluation threshold.

According to the present invention, as a fourth solving means related to the battery information collecting device, in any one of the first to third solving means, the computing unit generates the evaluation threshold value for each type of the battery data. and outputs it to the communication unit.

In the present invention, as a first solving means related to the battery monitoring system, a means comprising a battery information collecting device according to any one of the first to fourth solving means and a plurality of the battery systems is adopted. .

In the present invention, as a second solution to the battery monitoring system, in the first solution, the battery system receives the evaluation threshold value stored by itself from the battery information collection device and evaluates it. A means of updating the threshold value and evaluating thermal runaway of the battery based on the updated evaluation threshold value is adopted.

In the present invention, as a third solution to the battery monitoring system, in the first or second solution, the battery system transmits at least battery voltage and battery temperature to the battery information collection device as the battery data. Use the method of sending.

In the present invention, as a fourth solution related to the battery monitoring system, in any one of the first to third solutions, each of the battery systems detects an abnormality of the battery when thermal runaway of the battery is detected. to the battery information collecting device.

ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide the battery information collection apparatus and battery monitoring system which can evaluate the thermal runaway of several batteries more correctly than before.

1 is a system configuration diagram showing the configuration of a battery monitoring system according to one embodiment of the present invention; FIG. 1 is a block diagram showing functional configurations of battery systems P1 to Pn and a battery data server D according to an embodiment of the present invention; FIG. 4 is a flow chart showing the operation of battery systems P1-Pn in one embodiment of the present invention. 4 is a flow chart showing the operation of a battery monitoring support server D (battery information collecting device) in one embodiment of the present invention. It is a schematic diagram which shows the histogram calculation method of the battery monitoring system which concerns on one Embodiment of this invention. FIG. 4 is a schematic diagram showing a method for determining thermal runaway in the battery monitoring system according to one embodiment of the present invention;

An embodiment of the present invention will be described below with reference to the drawings.
A battery monitoring system A according to this embodiment includes a plurality (n) of battery systems P1 to Pn, a public line N, and a battery monitoring support server D, as shown in FIG. Note that "n" is a natural number of 2 or more.

The n battery systems P1-Pn are provided in the electric vehicles M1-Mn, respectively. That is, the first battery system P1 is provided in the first electric vehicle M1, the second battery system P2 is provided in the second electric vehicle M2, (omitted), and the nth battery system Pn is provided in the nth battery system Pn. It is provided in the electric vehicle Mn.

A plurality of (n) electric vehicles M1 to Mn are vehicles that run based on running power generated by electric motors, and are equipped with battery systems P1 to Pn as power supply systems for driving the electric motors. Such electric vehicles M1 to Mn are, for example, hybrid vehicles or electric vehicles.

Such n battery systems P1 to Pn have almost the same functional configuration as shown in FIG. 2(a). That is, the n battery systems P1 to Pn have a battery 1, a CVS 2, a BMU 3, a communication section 4, and an abnormality detection circuit 5 as common functional components. These battery 1, CVS 2, BMU 3 and communication unit 4 are electrically interconnected.

A battery 1 is an assembled battery and a secondary battery such as a lithium ion battery or a fuel cell, and has one or a plurality of battery modules connected in series. Provides power to an external load. A battery module constituting the battery 1 is formed by connecting a plurality of battery cells in series. This load is a PCU (Power Control Unit) that electrically drives the electric motor (running motor) described above.

Also, this battery 1 is additionally equipped with several sensors. That is, the battery 1 is provided with a temperature sensor that outputs a temperature detection signal indicating the temperature of the battery 1 (battery temperature) and a current sensor that outputs a current detection signal indicating the output current of the battery 1 (battery current). is provided in When the battery 1 is composed of a plurality of battery modules, the temperature sensor is provided for each battery module.

The CVS 2 is electrically connected to the battery 1 and is a voltage detection circuit (cell voltage sensor) that detects the voltage of each battery cell (cell voltage). That is, the CVS 2 receives an electrode voltage signal indicating the voltage of each electrode from each battery cell, and detects the cell voltage of each battery cell based on this electrode voltage signal. The CVS 2 also converts the cell voltage (analog voltage) of each battery cell into a digital value (cell voltage data) and outputs the digital value (cell voltage data) to the BMU 3 .

Further, the CVS 2 generates battery temperature data indicating the battery temperature of the battery 1 by amplifying and A/D converting the temperature detection signal input from the battery 1 . The CVS 2 also outputs battery temperature data to the BMU 3 in addition to the cell voltage data of each battery cell described above. Such cell voltage data and battery temperature data are battery data indicating the operating state of the battery 1 .

Further, the CVS 2 is provided with a plurality of discharge circuits for each battery cell and forcibly discharging each battery cell. This discharge circuit is a series circuit of an electronic switch that is turned ON/OFF based on a control signal input from the BMU 3 and a discharge resistor with a predetermined resistance value. It is connected to the other electrode of the cell. Such a discharge circuit forces the battery cell into a forced discharge state by setting the electronic switch to the ON state, and sets the battery cell to the non-discharge state by setting the electronic switch to the OFF state.

The BMU 3 is a battery monitoring device (Battery Management Unit) that monitors the battery 1 . That is, the BMU 3 monitors the operation of the battery 1 by centrally controlling the CVS 2 and the communication section 4 based on a pre-stored monitoring control program.

More specifically, the BMU 3 receives battery data (cell voltage data and battery temperature data) input from the CVS 2, a current detection signal input from the battery 1, and inputs from the host controllers of the electric vehicles M1 to Mn. It monitors the operation of the battery 1 based on the control command, and executes some monitoring processes as necessary.

The BMU 3 evaluates the thermal runaway of the battery 1 as part of the monitoring process, outputs the evaluation result together with the battery data (cell voltage data and battery temperature data) to the communication unit 4, and causes it to be transmitted to the battery monitoring support server D. . The battery data in this embodiment includes normal battery data when the battery 1 is normal (no thermal runaway) and abnormal battery data when the battery 1 is abnormal (thermal runaway).

That is, the BMU 3 stores battery data (cell voltage data and battery temperature data) as abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) when the battery 1 is in thermal runaway and abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) when the battery 1 is not in thermal runaway. The normal battery data (normal cell voltage data and normal battery temperature data) are classified and transmitted to the battery monitoring support server D.

Another monitoring process is cell balance control for equalizing the state of charge of each battery cell. That is, when the BMU 3 determines that the uniformity of the charged state of each battery cell is broken, the BMU 3 sets the discharge circuit of the battery cell with the larger charged amount to the ON state, thereby forcing the battery cell with the larger charged amount. Discharge. This restores the uniformity of the state of charge of each battery cell.

The communication unit 4 is a wireless communication device that performs wireless communication via the public line N. FIG. That is, the communication unit 4 generates a transmission packet (uplink communication packet) conforming to the communication protocol of the public line N and transmits it to the battery monitoring support server D, and also generates a transmission packet conforming to the communication protocol of the public line N ( downstream communication packet) from the battery monitoring support server D.

Here, for example, abnormal data (abnormal cell voltage data and abnormal battery temperature data) or normal data (normal cell voltage data and normal battery temperature data) are stored as transmission data in the upstream communication packet. On the other hand, in the downstream communication packet, an evaluation threshold for the BMU 3 to evaluate the thermal runaway of the battery 1 is stored as transmission data.

The abnormality detection circuit 5 is electrically connected to the battery 1, the CVS 2 and the BMU 3, and receives the electrode voltage signal and the temperature detection signal of each battery cell from the battery 1. The abnormality detection circuit 5 compares each electrode voltage signal and temperature detection signal with an evaluation threshold to determine whether the operating state of the battery 1 is normal or abnormal, and outputs this determination result to the CVS 2 and BMU 3. .

That is, when the abnormality detection circuit 5 determines that the battery 1 is abnormal as a result of comparing each electrode voltage signal and temperature detection signal with the evaluation threshold value, an abnormality signal indicating the abnormality of the battery is sent to the CVS 2 and the BMU 3. Output. On the other hand, when the abnormality detection circuit 5 determines that the battery 1 is normal as a result of comparing each electrode voltage signal and temperature detection signal with the evaluation threshold value, a normal signal indicating normality of the battery is sent to the CVS 2 and BMU 3. Output.

Here, the n battery systems P1 to Pn have a sleep mode and a normal mode as operation modes. Sleep mode is a power saving mode with more limited functions than normal mode. Also, the normal mode is an operation mode in which all possible functions are exhibited, and is a normal power mode in which power consumption is significantly higher than in the power saving mode.

Of the battery 1, CVS 2, BMU 3, communication unit 4, and abnormality detection circuit 5 that constitute each of the battery systems P1 to Pn, the abnormality detection circuit 5 is always supplied with power regardless of whether it is in sleep mode or normal mode. It is an always-on circuit that performs the desired function. On the other hand, the CVS 2 and BMU 3 are emergency energizing circuits that are supplied with power and perform their desired functions in the normal mode, but are not supplied with power and do not perform their desired functions in the sleep mode.

A public line N shown in FIG. 1 is a radio communication line for a mobile phone or the like, and relays radio communication between the n battery systems P1 to Pn and the battery monitoring support server D. FIG. This public line N is connected to the well-known Internet, and wirelessly connects a battery monitoring support server D provided as a Web server on the Internet to n battery systems P1 to Pn, which are mobile terminals. do.

The battery monitoring support server D is a battery information collecting device according to this embodiment. This battery monitoring support server D is provided as a web server on the Internet as described above. The n battery systems P1 to Pn are positioned as clients of a battery monitoring support server D (Web server).

Such a battery monitoring support server D includes a communication section 6, a calculation section 7 and a storage section 8 as shown in FIG. 2(b). The communication unit 6 is a wireless communication device that performs wireless communication via the public line N, like the communication unit 4 of each of the battery systems P1 to Pn described above. That is, the communication unit 6 generates a transmission packet (downlink communication packet) conforming to the communication protocol of the public network N and transmits the transmission packet conforming to the communication protocol of the public network N to each of the battery systems P1 to Pn. (Uplink communication packet) is received from each of the battery systems P1 to Pn.

Such a communication unit 6 extracts transmission data, that is, abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) or normal battery data (normal cell voltage data and normal battery temperature data) from the upstream communication packet, output to 7. The communication unit 6 also stores the evaluation threshold input from the calculation unit 7 as transmission data in an upstream communication packet and transmits the same to each of the battery systems P1 to Pn.

The calculation unit 7 performs predetermined information processing based on the battery monitoring support program read from the storage unit 8 . That is, the calculation unit 7 is electrically connected to the communication unit 6 and the storage unit 8, and based on the battery monitoring support program, the battery data input from the communication unit 6, that is, the abnormal battery data (abnormal cell voltage data). and abnormal battery temperature data) and normal battery data (normal cell voltage data and normal battery temperature data) are stored in the storage unit 8 .

Further, the calculation unit 7 generates an evaluation threshold value based on the battery data read from the storage unit 8 and the attribute data of the battery 1 stored in advance in the storage unit 8, based on the battery monitoring support program. , and outputs the evaluation threshold value to the communication unit 6 . That is, the calculation unit 7 performs predetermined information processing on the abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) and normal battery data (normal cell voltage data and normal battery temperature data) temporarily stored in the storage unit 8. to generate an evaluation threshold.

The storage unit 8 preliminarily stores attribute data of the battery 1 installed in each of the electric vehicles M1 to Mn. The storage unit 8 also sequentially stores abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) and normal battery data (normal cell voltage data and normal battery temperature data) input from the calculation unit 7 . Furthermore, the storage unit 8 stores in advance the battery monitoring support program described above.

Next, the operation of the battery monitoring system A according to this embodiment will be described in detail along the flowcharts shown in FIGS. 3 and 4. FIG.

In the battery monitoring system A, the n battery systems P1 to Pn and the battery monitoring support server D (battery information collecting device according to the present embodiment) wirelessly communicate with each other via a public network N, so that each electric vehicle This has the effect of more accurately evaluating the thermal runaway of the individual batteries 1 mounted on M1 to Mn than in the prior art.

First, the operation of each of the battery systems P1-Pn will be described along the flowchart of FIG. In each of the battery systems P1 to Pn, the abnormality detection circuit 5, which is a constantly energized circuit, regardless of sleep mode or normal mode, based on the electrode voltage signal and temperature detection signal of each battery cell and the evaluation threshold value, The state evaluation of the battery 1 is always performed (step S1).

When the detection result of the abnormality detection circuit 5, that is, the state evaluation result of the battery 1 is "abnormal", an abnormality signal is output to the CVS2 and BMU3. When the operation mode of the CVS 2 and the BMU 3 is the sleep mode, the supply of power is started and the CVS 2 and the BMU 3 are activated (step S2). That is, when the CVS 2 and the BMU 3 receive an anomaly signal from the anomaly detection circuit 5, the operation mode switches from the sleep mode to the normal mode.

Then, the CVS 2 starts taking in the cell voltage and battery temperature from the battery 1, sequentially acquires the cell voltage and battery temperature at predetermined time intervals (step S3), and abnormal cell voltage data indicating the cell voltage and the battery Abnormal battery temperature data indicating the temperature, that is, abnormal battery data is sequentially output to the BMU 3 . Then, the BMU 3 sequentially stores the abnormal battery data sequentially input from the CVS 2 in the internal memory (step S4).

When the data amount of the abnormal battery data in the internal memory exceeds a predetermined amount (step S5), the BMU 3 causes the communication unit 4 to transmit the abnormal battery data (step S6). That is, the BMU 3 reads out a predetermined amount of abnormal battery data from the internal memory and outputs the abnormal battery data to the communication unit 4 so that the predetermined amount of abnormal battery data is included in an upstream communication packet and transmitted to the battery monitoring support server D.

On the other hand, when the abnormality detection circuit 5 evaluates that the battery 1 is "normal" (step S1), it outputs a normal signal to the CVS2 and BMU3. CVS 2 and BMU 3 are activated when their operation mode is sleep mode, but CVS 2 starts taking in cell voltage and battery temperature from battery 1 when it is in normal mode. Then, the CVS 2 sequentially acquires the cell voltage and battery temperature at predetermined time intervals (step S7), and sequentially outputs normal cell voltage data indicating the cell voltage and normal battery temperature data indicating the battery temperature, that is, normal battery data, to the BMU 3. do. Then, the BMU 3 sequentially stores the normal battery data sequentially input from the CVS 2 in the internal memory (step S8).

When the data amount of the normal battery data in the internal memory exceeds a predetermined amount (step S9), the BMU 3 causes the communication unit 4 to transmit the normal battery data (step S10). That is, the BMU 3 reads out a predetermined amount of normal battery data from the internal memory and outputs it to the communication unit 4 so that the predetermined amount of normal battery data is included in an upstream communication packet and transmitted to the battery monitoring support server D.

Further, when the communication section 4 receives the update request, the determination result in step S1 becomes "update". That is, when the communication unit 4 receives an update request from the battery monitoring support server D, this update request is input from the communication unit 4 to the BMU 3 . When the communication unit 4 receives this update request, the BMU 3 starts to be supplied with power if its own operation mode is the sleep mode (step S11). That is, when the CVS 2 and BMU 3 receive an update request from the communication unit 4, the operation mode switches from the sleep mode to the normal mode.

The BMU 3 then causes the communication unit 4 to receive a new evaluation threshold value (updated evaluation threshold value) based on the update request (step S12). The BMU 3 then stores the updated evaluation threshold in the internal memory (step S13). When the updated evaluation threshold value is newly stored in the internal memory, abnormality detection circuit 5 evaluates the operating state of battery 1 using the updated evaluation threshold value.

That is, in each of the battery systems P1 to Pn in this embodiment, the evaluation threshold value for evaluating the operating state of the battery 1 is updated every time the updated evaluation threshold value is newly stored in the BMU 3 .

Further, the evaluation threshold values sequentially updated in each of the battery systems P1 to Pn are, as shown in the flowchart of FIG. 4, the abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) and normal battery data (normal cell voltage data and normal battery temperature data).

The communication unit 6 of the battery monitoring support server D receives upstream communication packets sequentially sent from the communication units 1 of the battery systems P1 to Pn (step Sa1), and extracts abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) or normal battery data (normal cell voltage data and normal battery temperature data) are extracted and output to the calculation unit 7 .

Then, the calculation unit 7 sequentially stores the abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) or normal battery data (normal cell voltage data and normal battery temperature data) sequentially input from the communication unit 6 to the storage unit 8. Memorize (save).

Then, the calculation unit 7 performs the following statistical processing on the abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) and normal battery data (normal cell voltage data and normal battery temperature data) read from the storage unit 8. Then, a thermal runaway model of battery 1 is created (step Sa2).

That is, the computing unit 7 performs histogram processing on a plurality of abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) and normal battery data (normal cell voltage data and normal battery temperature data) acquired from each of the battery systems P1 to Pn. , histograms of abnormal battery data and normal battery data are created as shown in FIG.

This histogram is created for each type of abnormal battery data and normal battery data. That is, the calculation unit 7 creates a cell voltage histogram regarding abnormal cell voltage data and normal cell voltage data and a battery temperature histogram regarding abnormal battery temperature data and normal battery temperature data.

As shown in FIG. 5, the histograms for each type have independent and different frequency distributions for abnormal battery data and normal battery data. That is, the abnormality histogram formed by the plurality of abnormal battery data and the normal histogram formed by the plurality of normal battery data are obtained when the operating state of the battery 1 is different, so that they are independent individual frequencies that do not overlap each other. distribution.

Such a histogram for each type of abnormal battery data and normal battery data is a statistical thermal runaway model of the battery 1 . That is, the thermal runaway model of the battery 1 in this embodiment is composed of a plurality of histograms given by abnormal battery data and normal battery data for each type.

The calculation unit 7 uses the data value R located between the minimum value of the abnormal histogram and the maximum value of the normal histogram as the update evaluation threshold for each type of histogram (cell voltage histogram and battery temperature histogram). Extract (step Sa3).

The calculation unit 7 calculates the difference between the update evaluation threshold extracted in this way and the current evaluation threshold, that is, the update evaluation threshold extracted in step Sa3 and the evaluation threshold set in the previous update processing. (step Sa4). Then, the calculation unit 7 determines whether or not the threshold change amount exceeds a preset change amount evaluation value (step Sa5).

Then, if the determination in step Sa5 is "Yes", the calculation unit 7 outputs the updated evaluation threshold value extracted in step Sa3 to the communication unit 6 to transmit it to each of the battery systems P1 to Pn (step Sa6 ). That is, when the updated evaluation threshold value is input from the calculation unit 7, the communication unit 6 includes the updated evaluation threshold value in a downstream communication packet and transmits the packet to each of the battery systems P1 to Pn.

According to this embodiment, the battery monitoring support server D generates the update evaluation threshold value based on the plurality of abnormal battery data and the normal battery data acquired from the plurality of battery systems P1 to Pn. The evaluation threshold reflects the operating states of the batteries 1 in the battery systems P1 to Pn. Therefore, according to this embodiment, it is possible to evaluate the thermal runaway of a plurality of batteries 1 more accurately than in the prior art.

In addition, the update evaluation threshold values in the plurality of battery systems P1 to Pn are received from the battery monitoring support server D and updated each time the amount of change in the threshold value exceeds the change amount evaluation value. will be updated accordingly. That is, according to the present embodiment, since the updated evaluation threshold value is sequentially updated in time series, it is possible to accurately determine thermal runaway of a plurality of batteries 1 in the course of use of the batteries 1 .

Further, according to the present embodiment, since the evaluation thresholds for evaluating the cell voltage and battery temperature are generated based on the abnormal battery data and normal battery data of the plurality of batteries 1, the cell voltage and battery temperature It is possible to more accurately evaluate the thermal runaway of a plurality of batteries 1 based on

Furthermore, according to the present embodiment, the battery information collection device is configured as a battery monitoring support server D, that is, a Web server. Information exchange is easy. Therefore, according to this embodiment, it is possible to provide a convenient battery monitoring system A.

It should be noted that the present invention is not limited to the above-described embodiments, and for example, the following modifications are conceivable.
(1) In the above embodiment, the type of battery data, that is, the case where the parameters for evaluating the thermal runaway of the battery 1 are cell voltage data (cell voltage) and battery temperature data (battery temperature) have been described. It is not limited to this. As a parameter for evaluating the type of battery data, that is, the thermal runaway of the battery 1, for example, those shown in FIG. 6(a) can be considered.

That is, in addition to cell voltage data (cell voltage) and battery temperature data (battery temperature), the types of battery data include, for example, overall SOC (State of Charge) data (SOC) of the battery 1, charging of the battery 1 Cycle data (cycle), type data (type) of battery 1, vehicle type data (vehicle type) of electric vehicles M1 to Mn in which battery 1 is installed, usage environment data of battery 1 (electric vehicles M1 to Mn) (usage environment ), etc. can be considered.

Each of the battery systems P1 to Pn transmits the cell voltage data, battery temperature data, SOC data, charging cycle data, type data, vehicle type data, usage environment data, etc. to the battery monitoring support server D (battery information collecting device). On the other hand, as shown in FIG. 6B, the battery monitoring support server D provides a plurality of create a histogram of

Then, based on each histogram, the battery monitoring support server D sets an evaluation threshold value (cell voltage evaluation threshold value) corresponding to the voltage data, an evaluation threshold value (battery temperature evaluation threshold value) corresponding to the battery temperature data, and a battery temperature evaluation threshold value. value), evaluation threshold corresponding to SOC data (SOC voltage evaluation threshold), evaluation threshold corresponding to charge cycle data (charge cycle evaluation threshold), evaluation threshold corresponding to type data ( Battery type evaluation threshold value), evaluation threshold value corresponding to vehicle type data (vehicle type evaluation threshold value), evaluation threshold value corresponding to usage environment data (usage environment evaluation threshold value), and the like are generated.

Then, the battery monitoring support server D has such a plurality of evaluation thresholds (cell voltage evaluation threshold, battery temperature evaluation threshold, SOC voltage evaluation threshold, charge cycle evaluation threshold, battery type evaluation The threshold value, the vehicle type evaluation threshold value, the use environment evaluation threshold value, etc. are transmitted to each of the battery systems P1 to Pn, and each of the battery systems P1 to Pn receives the cell voltage evaluation threshold value and the battery temperature evaluation threshold value. value, SOC voltage evaluation threshold, charging cycle evaluation threshold, battery type evaluation threshold, vehicle type evaluation threshold, usage environment evaluation threshold, etc. conduct.

(2) In the above embodiment, the update condition is that the threshold change amount exceeds the change amount evaluation value, but the present invention is not limited to this. For example, an amount other than the amount of change in the threshold value, such as the elapsed time from the previous update time, may be used as the update condition. When the elapsed time is used as an update condition, when the elapsed time exceeds a predetermined elapsed time evaluation value, the newly obtained evaluation threshold is transmitted to each of the battery systems P1 to Pn for updating.

(3) In the above embodiment, a thermal runaway model is created from histograms of various battery data, but the present invention is not limited to this. For example, a thermal runaway model may be created based on statistical data other than histograms.

(4) In the above embodiment, the plurality of battery systems P1 to Pn and the battery monitoring support server D (battery information collection device) are connected via a public line N (relay line) so as to be wirelessly communicable. It is not limited to this. That is, the plurality of battery systems P1 to Pn and the battery monitoring support server D (battery information collecting device) may be directly connected so as to be wirelessly communicable without using a relay line.

A Battery monitoring system D Battery monitoring support server (battery information collection device)
M1~Mn Electric vehicle N Public line P1~Pn Battery system 1 Battery 2 CVS
3 BMUs
4 communication unit 5 abnormality detection circuit 6 communication unit 7 calculation unit 8 storage unit

Claims (8)

a communication unit that receives battery data indicating operating states of the batteries from a plurality of battery systems including batteries, and that transmits an evaluation threshold value for the battery system to evaluate thermal runaway of the battery to the battery system; ,
a computing unit that generates the evaluation threshold value based on the battery data acquired from the communication unit and outputs the evaluation threshold value to the communication unit. 2. The battery information according to claim 1, wherein the computing unit creates a histogram of data values of the plurality of batteries based on the battery data, and generates the evaluation threshold value based on the histogram. collector. The battery data includes normal battery data when the battery is normal and abnormal battery data when the battery is abnormal,
2. The calculating unit according to claim 1, wherein the evaluation threshold value is a data value between a normal histogram indicating the distribution of the normal battery data and an abnormal histogram indicating the distribution of the abnormal battery data. battery information collection device. The battery information collecting device according to any one of claims 1 to 3, wherein the calculation unit generates the evaluation threshold value for each type of the battery data and outputs the evaluation threshold value to the communication unit. A battery information collecting device according to any one of claims 1 to 4;
A battery monitoring system comprising: a plurality of the battery systems; The battery system updates the evaluation threshold stored therein to the evaluation threshold received from the battery information collection device, and evaluates thermal runaway of the battery based on the updated evaluation threshold. 6. The battery monitoring system according to claim 5, wherein: 7. The battery monitoring system according to claim 5, wherein the battery system transmits at least battery voltage and battery temperature to the battery information collecting device as the battery data. The battery monitoring system according to any one of claims 5 to 7, wherein each of the battery systems transmits an abnormality of the battery to the battery information collecting device when thermal runaway of the battery is detected. .

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