JP7799099B2 - Battery-connected devices - Google Patents

Description

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

Patent Document 1 below discloses a vehicle power supply device that reliably prevents thermal runaway in batteries while using an extremely simple circuit configuration. This power supply device includes multiple 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 abnormal battery temperature rise. The temperature detection circuit includes multiple temperature sensors that are thermally coupled to the batteries and change their electrical resistance with battery temperature, a voltage conversion circuit that converts the change in electrical resistance of each temperature sensor into a voltage change, an A/D converter that converts the output voltage of the voltage conversion circuit into a digital signal, and a control circuit that receives the temperature signal from the A/D converter. The abnormal temperature rise prevention circuit includes a comparator that compares the output voltage from the temperature detection circuit's voltage conversion circuit with a reference voltage and outputs an abnormal temperature signal if the battery temperature rises above a set temperature, and a forced current cut-off circuit connected to the comparator that detects the comparator's abnormal temperature signal and cuts off the battery current. The control circuit and abnormal temperature rise prevention circuit monitor the battery temperature and control the battery current.

Patent No. 4931378

However, while the above-mentioned background art evaluates thermal runaway in a single vehicle, i.e., a single battery, it is expected that thermal runaway characteristics will differ for each vehicle and battery depending on the operating environment and operating state of the vehicle and battery. With the above-mentioned background art, it is difficult to accurately evaluate thermal runaway for multiple batteries with different operating environments and operating states.

The present invention was made in consideration of the above-mentioned circumstances, and aims to provide a battery information collection device and battery monitoring system that can evaluate thermal runaway in multiple batteries more accurately than conventional methods.

To achieve the above objective, the present invention employs, as a first solution for a battery information collection device, a communication unit that receives battery data indicating the operating state of batteries from multiple battery systems that include batteries and transmits an evaluation threshold value to the battery system for the battery system to evaluate thermal runaway of the batteries, and a calculation 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.

The present invention provides a second solution related to the battery information collection device, which is the first solution described above, in which the calculation unit creates a histogram of data values for multiple batteries based on the battery data, and generates the evaluation threshold based on the histogram.

The present invention provides a third solution related to a battery information collection device, which is the first solution described above, in which 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 sets the evaluation threshold to a data value between a normal histogram showing the distribution of the normal battery data and an abnormal histogram showing the distribution of the abnormal battery data.

The present invention provides a fourth solution related to a battery information collection device, which is any one of the first to third solutions described above, in which the calculation unit generates the evaluation threshold for each type of battery data and outputs it to the communication unit.

The present invention employs, as a first solution for a battery monitoring system, a battery information collection device according to any one of the first to fourth solutions described above, and a plurality of the battery systems.

The present invention provides a second solution for a battery monitoring system, which is the same as the first solution described above, in which the battery system updates the evaluation threshold stored in itself to the evaluation threshold received from the battery information collection device, and evaluates thermal runaway of the battery based on the updated evaluation threshold.

The present invention provides a third solution for a battery monitoring system, which is the first or second solution described above, in which the battery system transmits at least the battery voltage and battery temperature as the battery data to the battery information collection device.

The present invention provides a fourth solution related to a battery monitoring system, which is any of the first to third solutions described above, in which each battery system transmits a battery abnormality to the battery information collection device when thermal runaway of the battery is detected.

The present invention makes it possible to provide a battery information collection device and battery monitoring system that can evaluate thermal runaway in multiple batteries more accurately than conventional methods.

1 is a system configuration diagram showing the configuration of a battery monitoring system according to an embodiment of the present invention; 2 is a block diagram showing the functional configuration of battery systems P1 to Pn and a battery data server D according to an embodiment of the present invention. FIG. 4 is a flowchart showing the operation of battery systems P1 to Pn in one embodiment of the present invention. 10 is a flowchart showing the operation of a battery monitoring support server D (battery information collection device) according to an embodiment of the present invention. 1 is a schematic diagram illustrating a histogram calculation method for a battery monitoring system according to an embodiment of the present invention. 1 is a schematic diagram showing a method for determining thermal runaway in a battery monitoring system according to an embodiment of the present invention;

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1, a battery monitoring system A according to this embodiment includes multiple (n) battery systems P1 to Pn, a public line N, and a battery monitoring support server D. Note that "n" is a natural number equal to or greater than 2.

The n battery systems P1 to Pn are provided in the electric vehicles M1 to 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 electric vehicle Mn.

Multiple (n) electric vehicles M1-Mn are vehicles that run on the driving power generated by electric motors, and are equipped with battery systems P1-Pn as power supply systems for driving the electric motors. These electric vehicles M1-Mn may be, for example, hybrid vehicles or electric vehicles.

As shown in Figure 2(a), these n battery systems P1 to Pn have almost the same functional configuration. That is, the n battery systems P1 to Pn have common functional components: a battery 1, a CVS 2, a BMU 3, a communication unit 4, and an abnormality detection circuit 5. The battery 1, CVS 2, BMU 3, and communication unit 4 are electrically connected to each other.

Battery 1 is a battery pack and secondary battery such as a lithium-ion battery or fuel cell, and is made up of one or more battery modules connected in series. It supplies DC power equal to the total voltage (battery voltage) of the electromotive forces of the battery modules to an external load. The battery module that makes up battery 1 is made up of multiple battery cells connected in series. This load is the PCU (Power Control Unit) that electrically drives the electric motor (travel motor) mentioned above.

The battery 1 is also equipped with several sensors. That is, the battery 1 is equipped 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). If the battery 1 is made up of multiple battery modules, the temperature sensor is provided for each battery module.

CVS2 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, CVS2 receives electrode voltage signals indicating the voltage of each electrode from each battery cell, and detects the cell voltage of each battery cell based on these electrode voltage signals. CVS2 also converts the cell voltage of each battery cell (analog voltage) into a digital value (cell voltage data) and outputs it to BMU3.

The CVS2 also generates battery temperature data indicating the battery temperature of the battery 1 by amplifying the temperature detection signal input from the battery 1 and then A/D converting it. In addition to the cell voltage data of each battery cell described above, the CVS2 also outputs battery temperature data to the BMU3. This cell voltage data and battery temperature data are battery data indicating the operating state of the battery 1.

The CVS2 also has multiple discharge circuits, one for each battery cell, that forcibly discharge each battery cell. These discharge circuits are series circuits consisting of an electronic switch that turns ON/OFF based on a control signal input from the BMU3 and a discharge resistor with a predetermined resistance value, with one end connected to one electrode of the battery cell and the other end connected to the other electrode of the battery cell. When the electronic switch is set to the ON state, such a discharge circuit forces the battery cell into a discharge state, and when the electronic switch is set to the OFF state, the battery cell into a non-discharge state.

BMU 3 is a battery management unit that monitors battery 1. In other words, BMU 3 monitors the operation of battery 1 by comprehensively controlling CVS 2 and communication unit 4 based on a pre-stored monitoring control program.

More specifically, BMU 3 monitors the operation of battery 1 based on battery data (cell voltage data and battery temperature data) input from CVS 2, current detection signals input from battery 1, and control commands input from the higher-level control devices of electric vehicles M1 to Mn, and performs several monitoring processes as necessary.

As part of the monitoring process, the BMU 3 evaluates thermal runaway of the battery 1 and outputs the evaluation results together with battery data (cell voltage data and battery temperature data) to the communication unit 4, which then transmits them to the battery monitoring support server D. In this embodiment, the battery data includes normal battery data when the battery 1 is normal (not in thermal runaway state) and abnormal battery data when the battery 1 is abnormal (in thermal runaway state).

In other words, BMU3 classifies battery data (cell voltage data and battery temperature data) into abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) when battery 1 experiences thermal runaway and normal battery data (normal cell voltage data and normal battery temperature data) when battery 1 does not experience thermal runaway, and transmits the data to battery monitoring support server D.

Another monitoring process is cell balance control, which equalizes the state of charge of each battery cell. That is, when the BMU 3 determines that the state of charge of each battery cell is not uniform, it forcibly discharges the battery cell with the greater charge by setting the discharge circuit of the battery cell with the greater charge amount to the ON state. This restores uniformity in 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. That is, the communication unit 4 generates transmission packets (upstream communication packets) that conform to the communication protocol of the public line N and transmits them to the battery monitoring support server D, and also receives transmission packets (downstream communication packets) that conform to the communication protocol of the public line N from the battery monitoring support server D.

Here, the upstream communication packet stores, as transmission data, 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). Meanwhile, the downstream communication packet stores, as transmission data, an evaluation threshold value used by the BMU 3 to evaluate thermal runaway of the battery 1.

The abnormality detection circuit 5 is electrically connected to the battery 1, CVS 2, and BMU 3, and receives electrode voltage signals and temperature detection signals from 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 status of the battery 1 is normal or abnormal, and outputs this determination result to the CVS 2 and BMU 3.

In other words, if the abnormality detection circuit 5 determines that battery 1 is abnormal as a result of comparing each electrode voltage signal and temperature detection signal with the evaluation threshold, it outputs an abnormality signal indicating that battery is abnormal to CVS2 and BMU3. On the other hand, if the abnormality detection circuit 5 determines that battery 1 is normal as a result of comparing each electrode voltage signal and temperature detection signal with the evaluation threshold, it outputs a normality signal indicating that battery is normal to CVS2 and BMU3.

Here, the n battery systems P1 to Pn have two operating modes: sleep mode and normal mode. Sleep mode is a power-saving mode with more limited functionality than normal mode. Normal mode is an operating mode in which all available functions are available, and consumes significantly more power than power-saving mode.

Of the battery 1, CVS 2, BMU 3, communication unit 4, and abnormality detection circuit 5 that make up each battery system P1-Pn, the abnormality detection circuit 5 is a constantly energized circuit that is always supplied with power and performs its desired function regardless of whether it is in sleep mode or normal mode. In contrast, the CVS 2 and BMU 3 are emergency energized circuits that are supplied with power in normal mode and perform their desired function, but are not supplied with power in sleep mode and do not perform their desired function.

The public line N shown in Figure 1 is a wireless communication line such as a mobile phone line, and relays wireless communication between the n battery systems P1 to Pn and the battery monitoring support server D. This public line N is connected to the well-known Internet, and wirelessly connects the battery monitoring support server D, which is set up as a web server on the Internet, with the n battery systems P1 to Pn, which are mobile terminals.

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

As shown in Figure 2(b), this battery monitoring support server D includes a communication unit 6, a calculation unit 7, and a memory unit 8. Similar to the communication units 4 of each of the battery systems P1 to Pn described above, the communication unit 6 is a wireless communication device that performs wireless communication via the public line N. In other words, the communication unit 6 generates transmission packets (downstream communication packets) that conform to the communication protocol of the public line N and transmits them to each of the battery systems P1 to Pn, and also receives transmission packets (upstream communication packets) that conform to the communication protocol of the public line N from each of the battery systems P1 to Pn.

The communication unit 6 extracts transmission data, i.e., 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 and outputs it to the calculation unit 7. The communication unit 6 also stores the evaluation threshold input from the calculation unit 7 as transmission data in the upstream communication packet and transmits it to each battery system P1 to Pn.

The calculation unit 7 performs predetermined information processing based on the battery monitoring support program read from the memory unit 8. That is, the calculation unit 7 is electrically connected to the communication unit 6 and the memory unit 8, and stores the battery data input from the communication unit 6, i.e., 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), in the memory unit 8 based on the battery monitoring support program.

Furthermore, the calculation unit 7 generates an evaluation threshold based on the battery data read from the memory unit 8 and the attribute data of the battery 1 pre-stored in the memory unit 8, in accordance with the battery monitoring support program, and outputs the evaluation threshold to the communication unit 6. That is, the calculation unit 7 generates the evaluation threshold by performing 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 memory unit 8.

The memory unit 8 pre-stores attribute data for each battery 1 installed in each electric vehicle M1 to Mn. The memory 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. The memory unit 8 also pre-stores 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 with reference to the flowcharts shown in Figures 3 and 4.

The battery monitoring system A has the effect of evaluating thermal runaway of each battery 1 installed in each electric vehicle M1-Mn more accurately than before by wirelessly communicating with n battery systems P1-Pn and a battery monitoring support server D (a battery information collection device according to this embodiment) via a public line N.

First, the operation of each battery system P1-Pn will be described using the flowchart in Figure 3. In each battery system P1-Pn, the abnormality detection circuit 5, which is a constantly energized circuit, constantly evaluates the state of the battery 1 based on the electrode voltage signal and temperature detection signal of each battery cell and the evaluation threshold value, regardless of whether the system is in sleep mode or normal mode (step S1).

If the detection result of the abnormality detection circuit 5, i.e., the battery 1 status evaluation result, is "abnormal," an abnormality signal is output to CVS2 and BMU3. If CVS2 and BMU3 are in sleep mode, they start up by starting up the supply of power (step S2). In other words, when an abnormality signal is input from the abnormality detection circuit 5, CVS2 and BMU3 switch their operating mode from sleep mode to normal mode.

Then, CVS2 begins to capture the cell voltage and battery temperature from battery 1, sequentially acquiring the cell voltage and battery temperature at predetermined time intervals (step S3), and sequentially outputs abnormal cell voltage data indicating the cell voltage and abnormal battery temperature data indicating the battery temperature, i.e., abnormal battery data, to BMU3. Then, BMU3 sequentially saves the abnormal battery data sequentially input from CVS2 in its internal memory (step S4).

Then, when the amount of abnormal battery data in the internal memory exceeds a predetermined amount (step S5), the BMU 3 causes the abnormal battery data to be transmitted to the communication unit 4 (step S6). That is, the BMU 3 reads the predetermined amount of abnormal battery data from the internal memory and outputs it to the communication unit 4, thereby causing the predetermined amount of abnormal battery data to be included in an upstream communication packet and transmitted to the battery monitoring support server D.

On the other hand, if the abnormality detection circuit 5 evaluates battery 1 as "normal" (step S1), it outputs a normal signal to CVS2 and BMU3. CVS2 and BMU3 will start up if their operating mode is sleep mode, but if it is normal mode, CVS2 will begin capturing cell voltage and battery temperature from battery 1. CVS2 then sequentially acquires cell voltage and battery temperature at predetermined time intervals (step S7) and sequentially outputs normal cell voltage data indicating cell voltage and normal battery temperature data indicating battery temperature, i.e., normal battery data, to BMU3. BMU3 then sequentially saves the normal battery data sequentially input from CVS2 in its internal memory (step S8).

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

Furthermore, when the communication unit 4 receives an update request, the judgment 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 this update request is input to the communication unit 4, if the BMU 3's operating mode is sleep mode, power supply is started and the BMU 3 starts up (step S11). That is, when the update request is input from the communication unit 4, the operating mode of the CVS 2 and BMU 3 switches from sleep mode to normal mode.

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

In other words, in each battery system P1 to Pn in this embodiment, the evaluation threshold for evaluating the operating state of battery 1 is updated each time a new updated evaluation threshold is saved in BMU 3.

In addition, the evaluation thresholds that are sequentially updated in each battery system P1 to Pn are generated based 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) received by the battery monitoring support server D from the battery systems P1 to Pn, as shown in the flowchart of Figure 4.

The communication unit 6 of the battery monitoring support server D receives upstream communication packets sent sequentially from the communication unit 1 of each battery system P1 to Pn (step Sa1), 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) from the upstream communication packets, and outputs the data to the calculation unit 7.

Then, the calculation unit 7 sequentially stores (preserves) 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 in the memory unit 8.

Then, the calculation unit 7 performs the statistical processing described below 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 memory unit 8 to create a thermal runaway model of the battery 1 (step Sa2).

That is, the calculation unit 7 performs histogram processing on multiple 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 battery system P1 to Pn, thereby creating histograms of the abnormal battery data and normal battery data as shown in Figure 5.

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 for abnormal cell voltage data and normal cell voltage data, and a battery temperature histogram for abnormal battery temperature data and normal battery temperature data.

As shown in Figure 5, these histograms for each type have different frequency distributions for abnormal battery data and normal battery data. In other words, the abnormal histogram formed by multiple abnormal battery data and the normal histogram formed by multiple normal battery data are independent frequency distributions that do not overlap with each other, because they were acquired when the battery 1 was in a different operating state.

These histograms of abnormal battery data and normal battery data for each type are a statistical thermal runaway model of battery 1. In other words, the thermal runaway model of battery 1 in this embodiment is composed of multiple histograms provided by abnormal battery data and normal battery data for each type.

For each type of histogram (cell voltage histogram and battery temperature histogram), the calculation unit 7 extracts the data value R midway between the minimum value of the abnormal histogram and the maximum value of the normal histogram as the updated evaluation threshold (step Sa3).

The calculation unit 7 calculates the difference between the updated evaluation threshold extracted in this way and the current evaluation threshold, i.e., the amount of change (threshold change) between the updated evaluation threshold extracted in step Sa3 and the evaluation threshold set in the previous update process (step Sa4).The calculation unit 7 then determines whether this threshold change exceeds a preset change evaluation value (step Sa5).

If the determination in step Sa5 is "Yes," the calculation unit 7 outputs the updated evaluation threshold extracted in step Sa3 to the communication unit 6, which transmits the updated evaluation threshold to each battery system P1-Pn (step Sa6). That is, when the communication unit 6 receives the updated evaluation threshold from the calculation unit 7, it incorporates the updated evaluation threshold into a downstream communication packet and transmits it to each battery system P1-Pn.

According to this embodiment, the battery monitoring support server D generates an updated evaluation threshold based on multiple abnormal battery data and normal battery data acquired from multiple battery systems P1 to Pn, so the updated evaluation threshold reflects the operating state of the multiple batteries 1 in the multiple battery systems P1 to Pn. Therefore, this embodiment makes it possible to evaluate thermal runaway in the multiple batteries 1 more accurately than conventional methods.

In addition, the updated evaluation thresholds for the multiple battery systems P1 to Pn are received and updated from the battery monitoring support server D each time the threshold change amount exceeds the change amount evaluation value, and are therefore updated appropriately over the course of battery 1 usage. In other words, according to this embodiment, the updated evaluation thresholds are updated sequentially in chronological order, making it possible to accurately determine thermal runaway in multiple batteries 1 over the course of battery 1 usage.

Furthermore, according to this embodiment, the evaluation thresholds for evaluating cell voltage and battery temperature are generated based on abnormal battery data and normal battery data for multiple batteries 1, making it possible to more accurately evaluate thermal runaway of multiple batteries 1 based on cell voltage and battery temperature.

Furthermore, according to this embodiment, the battery information collection device is configured as a battery monitoring support server D, i.e., a web server, making it easy to exchange information with multiple battery systems P1-Pn, i.e., multiple electric vehicles M1-Mn, which are mobile bodies. Therefore, according to this embodiment, it is possible to provide a convenient battery monitoring system A.

The present invention is not limited to the above-described embodiment, and the following modifications are possible.
(1) In the above embodiment, the types of battery data, i.e., the parameters for evaluating thermal runaway of the battery 1, are cell voltage data (cell voltage) and battery temperature data (battery temperature), but the present invention is not limited to this. Possible types of battery data, i.e., parameters for evaluating thermal runaway of the battery 1, include, for example, those shown in FIG. 6( a).

In other words, types of battery data may include, in addition to cell voltage data (cell voltage) and battery temperature data (battery temperature), for example, overall SOC (State of Charge) data (SOC) of battery 1, charging cycle data (cycle) of battery 1, type data (type) of battery 1, vehicle model data (vehicle model) of electric vehicles M1 to Mn in which battery 1 is installed, and operating environment data (operating environment) of battery 1 (electric vehicles M1 to Mn).

Each battery system P1 to Pn transmits the cell voltage data, battery temperature data, SOC data, charging cycle data, type data, vehicle model data, and usage environment data to a battery monitoring support server D (battery information collection device). In response, the battery monitoring support server D creates multiple histograms based on the voltage data, battery temperature data, SOC data, charging cycle data, type data, vehicle model data, and usage environment data, as shown in Figure 6(b).

Then, based on each histogram, the battery monitoring support server D generates an evaluation threshold corresponding to the voltage data (cell voltage evaluation threshold), an evaluation threshold corresponding to the battery temperature data (battery temperature evaluation threshold), an evaluation threshold corresponding to the SOC data (SOC voltage evaluation threshold), an evaluation threshold corresponding to the charge cycle data (charge cycle evaluation threshold), an evaluation threshold corresponding to the type data (battery type evaluation threshold), an evaluation threshold corresponding to the vehicle model data (vehicle model evaluation threshold), and an evaluation threshold corresponding to the usage environment data (usage environment evaluation threshold).

The battery monitoring support server D then transmits these multiple evaluation thresholds (cell voltage evaluation threshold, battery temperature evaluation threshold, SOC voltage evaluation threshold, charging cycle evaluation threshold, battery type evaluation threshold, vehicle type evaluation threshold, and usage environment evaluation threshold, etc.) to each battery system P1 to Pn. Each battery system P1 to Pn then evaluates thermal runaway in its own battery 1 based on the cell voltage evaluation threshold, battery temperature evaluation threshold, SOC voltage evaluation threshold, charging cycle evaluation threshold, battery type evaluation threshold, vehicle type evaluation threshold, and usage environment evaluation threshold, etc.

(2) In the above embodiment, the update condition was that the threshold change amount exceeded the change amount evaluation value, but the present invention is not limited to this. For example, an amount other than the threshold change amount, such as the elapsed time since the previous update, may also be the update condition. Note that if the elapsed time is the update condition, when the elapsed time exceeds a predetermined elapsed time evaluation value, the newly acquired evaluation threshold value at that time is transmitted to each battery system P1 to Pn for updating.

(3) In the above embodiment, a thermal runaway model was created using histograms of various types of 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 multiple battery systems P1 to Pn and the battery monitoring support server D (battery information collection device) are connected wirelessly via a public line N (relay line), but the present invention is not limited to this. In other words, the multiple battery systems P1 to Pn and the battery monitoring support server D (battery information collection device) may be directly connected wirelessly without using a relay line.

A. Battery monitoring system D. Battery monitoring support server (battery information collection device)
M1 to Mn Electric vehicle N Public line P1 to Pn Battery system 1 Battery 2 CVS
3. BMU
4 Communication unit 5 Abnormality detection circuit 6 Communication unit 7 Calculation unit 8 Storage unit

Claims (3)

1. An apparatus connected to a battery that supplies power to an external load, comprising:
a voltage detection circuit that detects the cell voltage of the battery and outputs the detected cell voltage as battery data;
a battery monitoring device for evaluating thermal runaway of the battery;
an abnormality detection circuit that determines the operating state of the battery;
a communication unit that transmits the battery data transmitted from the battery monitoring device to a battery monitoring support server;
Equipped with
the abnormality detection circuit determines the operating state of the battery by comparing an electrode voltage signal of the battery cell of the battery and a temperature detection signal indicating the temperature of the battery with an evaluation threshold value for evaluating thermal runaway, and outputs the determination result to the voltage detection circuit and the battery monitoring device;
the voltage detection circuit outputs the battery data to the battery monitoring device;
The battery monitoring device
classifying the battery data into normal battery data and abnormal battery data based on the determination result, causing the communication unit to transmit the abnormal battery data to the battery monitoring support server when a predetermined amount of the abnormal battery data is stored, and causing the communication unit to transmit the normal battery data to the battery monitoring support server when a predetermined amount of the normal battery data is stored;
1. A device connected to a battery, comprising: the battery monitoring device updates the pre-stored evaluation threshold value to the evaluation threshold value received from the battery monitoring support server;
the abnormality detection circuit determines the operating state of the battery based on the updated evaluation threshold value.
2. A device connected to the battery of claim 1. A device connected to the battery described in claim 1 or claim 2, characterized in that the abnormality detection circuit constantly determines the operating state of the battery.